JPH10277793A - Timing signal control method for direct acting press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a timing signal control method for a direct-acting press capable of controlling a pressure signal and a timing signal output to a peripheral device in synchronization with a complex machining or a multi-step machining operation. SOLUTION: A predetermined slide position which is set in advance while the slide is descending is detected, and this position is set as a timing signal output start position. Or, a predetermined pressurizing force set in advance during the slide descent is detected, and this detection position is set as the output start position of the timing signal, and a predetermined time has elapsed since the pressurizing force was started to be maintained at the predetermined processing pressurizing force. A control method for outputting a timing signal at which the output of the timing signal ends at a time point.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a timing signal control method for controlling a timing signal for synchronizing with a peripheral device of a linear press.

[0002]

2. Description of the Related Art In a direct-acting press, a slide is operated in a vertical direction by a drive device that moves linearly in the vertical direction. Conventionally, for example, a hydraulic cylinder, a linear drive type electric motor, or the like has been widely used as this drive device. Usually, the position of the slide of the direct-acting press is controlled, and processing operations such as forming, drilling and cutting are performed by repeating the operation from the upper limit position to the lower limit position.

[0003]

In such a conventional direct-acting press, in order to perform a press operation in synchronization with peripheral devices such as a material loading and unloading machine, it is necessary to use an external press at a predetermined timing in the press working process. It is necessary to output an interlock signal to the device and control the operation of the peripheral device by the interlock signal.

On the other hand, in a so-called mechanical press in which a slide is driven by rotation of a crankshaft, an output signal of a rotary cam device is adopted as the interlock signal. This rotary cam device performs control to turn on or off an output signal within a predetermined range of a preset crankshaft rotation angle. That is, in the conventional mechanical press, since the working process is uniquely represented by the crankshaft rotation angle, it is possible to interlock with the peripheral device based on the crankshaft rotation angle.

However, the direct-acting press has a mechanism that cannot detect the rotation angle corresponding to the crankshaft rotation angle as described above, so that the conventional rotary cam device cannot be used as it is. For this purpose, it is necessary to generate a timing signal having the same function as the above-mentioned rotary cam signal, but the problem here is how to represent the processing step in the direct-acting press. . In other words, if an arbitrary position or time point in the processing step can be uniquely expressed, the timing signal can be generated based on the expression of the processing step.

[0006] Furthermore, recently, many press products are manufactured by precision processing that requires processing accuracy, or combined processing or multi-step processing in which a plurality of processing steps are sequentially combined and processed. . For this reason, there is a tendency to develop a press capable of processing by a pressurizing force control that can also be used for a direct-acting press, precision processing, and multi-stage motion processing that can also be used for composite processing or multi-step processing. Also, in a direct-acting press capable of performing such pressure control processing or capable of performing multi-step motion processing, automation of a press processing line in conjunction with peripheral equipment is a very important issue as described above. ing.

However, the prior art and literature which disclosed a method capable of uniquely expressing a press working step at the time of pressurizing force control and a press working step at the time of combined working or multi-step working in a direct-acting press. Etc. are not found. For this reason, it is very difficult to perform a machining operation while synchronizing with peripheral equipment at the time of pressing force control, complex machining, or multi-step machining.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has been made in consideration of the above-described problems, such as control of a pressing force, setting of a timing signal to be output to a peripheral device in synchronization with a pressing operation of combined machining or multi-step machining, and the like. It is an object of the present invention to provide a method of controlling a timing signal of a direct-acting press which enables control.

[0009]

In order to achieve the above object, according to the first aspect of the present invention, the slide 15 is lowered from the upper limit position U, and then the slide 15 is moved to the predetermined lower limit position Ln. After positioning, or after the pressing force is kept constant at a predetermined processing pressure, the slide 15 is raised to the upper limit position U, and at the time of this pressing, each processing step and the operation before and after the press machine are operated. A timing signal control method for a direct-acting press that outputs a timing signal for operating in synchronization with a peripheral device, wherein a predetermined slide position set in advance during slide descent is detected and the predetermined position is detected. A timing signal output start position, and a time point at which a predetermined time has elapsed after positioning at the lower limit position Ln is a timing signal output end position, or A predetermined pressurizing force set in advance during the slide descent is detected, and this detection position is set as the output start position of the timing signal, and a predetermined time has elapsed since the pressurizing force was started to be maintained at the predetermined processing pressurizing force. The timing signal is output with a time point as the output end position of the timing signal.

According to the first aspect of the present invention, when the slide is positioned at the predetermined lower limit position Ln and pressurized, the output of the timing signal is started (on or off) at a preset slide position while the slide is descending. Further, the output of the timing signal is terminated (off or on) when a predetermined time has elapsed after positioning at the lower limit position Ln.
Alternatively, when the pressing force is maintained and applied by pressure control when the pressing force reaches a predetermined processing pressure in the vicinity of the lower limit position Ln, a predetermined predetermined pressure during the slide descent is detected. The output of the timing signal is started (ON or OFF) at the position, and the output of the timing signal is ended (OFF or ON) when a predetermined time has elapsed after the start of holding the predetermined processing pressure. As described above, since the timing signal can be turned on / off at an arbitrary timing according to the slide position or the pressing force, precision processing can be performed in synchronization with the peripheral device.

According to the second aspect of the present invention, the slide 15 is lowered from the upper limit position U, and then, after the slide 15 is positioned at the predetermined lower limit position Ln, or the pressing force is kept constant at the predetermined processing pressing force. Later, the slide 15 is raised to the upper limit position U, and during this press working,
In a timing signal control method of a direct-acting press for outputting a timing signal for operating in synchronization with a peripheral device operating in a process before and after a press machine, a slide 1 is provided.
5 is set to the lower limit position Ln, and a point in time when a predetermined time has elapsed is set as the output start position of the timing signal, and a predetermined slide position set in advance while the slide is rising is detected and the predetermined position is set to the timing. A signal output end position, or a point in time at which a predetermined time has elapsed since the start of holding the pressing force at the predetermined processing pressing force, is set as the timing signal output start position, and a predetermined value set in advance during slide ascent. And outputs the timing signal with the detected position as the output end position of the timing signal.

According to the second aspect of the invention, when the slide is positioned at the predetermined lower limit position Ln and pressurized, the output of the timing signal is started when a predetermined time has elapsed after the positioning at the lower limit position Ln ( On or off)
Further, the output of the timing signal is ended (off or on) at a preset slide position during the slide ascent.
Alternatively, when the pressing force is maintained and pressurized by pressure control when the pressing force reaches a predetermined processing pressure near the lower limit position Ln, a predetermined time has elapsed since the start of holding the predetermined processing pressure. At this time, the output of the timing signal is started (on or off), and further, the output of the timing signal is ended (off or on) at a position where a predetermined pressure applied while the slide is rising is detected. As described above, since the timing signal can be turned on / off at an arbitrary timing according to the slide position or the pressing force, precision processing can be performed in synchronization with the peripheral device.

According to a third aspect of the present invention, the slide 15 is lowered from the upper limit position U, and then is positioned at a predetermined lower limit position Ln in a pressurizing step, then is raised by a predetermined distance and waits for a predetermined time in a standby step. After performing processing by a multi-stage motion in which the pressurizing step and the standby step are alternately performed, the slide 15 is raised to the upper limit position U and press-processed. And a standby step, in a timing signal control method of a direct-acting press that outputs a timing signal for operating in synchronization with peripheral equipment operating in the preceding and following steps of the press machine, from the output start position of the timing signal The range up to the output end position is characterized by a combination of the following positions. That is, 1) including at least one of a plurality of standby steps, 2) from a predetermined position of an ascending region to the standby step of a predetermined step, until a predetermined time elapses in the pressurizing step of the next and subsequent steps. , 3) after a lapse of a predetermined time in the pressurizing step of a predetermined step, to a predetermined position of a descending region to a press step of the next and subsequent steps, 4) at least one of the pressurizing steps of a plurality of steps Including, 5) from a predetermined position of the descending region to the pressurizing step of the predetermined step, until a predetermined time elapses in the pressurizing step, 6) after a predetermined time elapses in the pressurizing step of the predetermined step, It is a combination of each item up to a predetermined position of the rising area to the standby step.

According to the third aspect of the present invention, the slide is positioned at the predetermined lower limit position Ln of each stage and pressurized, then raised by a predetermined distance and waits for a predetermined time in a standby step, which is repeated alternately. In the multi-stage position motion or the repetitive position motion, the output of the timing signal can be started (on or off) at an arbitrary position and timing of each stage of the motion, so that precision processing such as multi-step processing or compound processing in synchronization with peripheral equipment can be performed. Becomes possible. At this time, each timing signal can be output at each stage, that is, it is a multi-point output signal. Therefore, when output at a common timing is required at each stage, the required number of output points of the timing signal is reduced. Less is needed. Further, since the output channel of the timing signal can be fixed, it is not necessary to change the output channel even when the number of stages changes, and the number of steps for changing hardware such as wiring change is reduced.

According to a fourth aspect of the present invention, the slide 15 is lowered from the upper limit position U, and then the predetermined pressurizing force is kept constant in the pressurizing step, and then the predetermined distance is raised for a predetermined time in the standby step. After processing by a multi-stage motion in which the pressurizing step and the standby step are alternately performed, the slide 1
5 is raised to the upper limit position U for press working, and in the press working, the pressurizing step and the standby step of each stage and the peripheral equipment operating in the front and rear steps of the press machine are operated in synchronization. In the direct-acting press timing signal control method for outputting the timing signal described above, the output start position and the output end position of the timing signal include a combination of the following positions. That is, 1) including at least one of a plurality of standby steps,
2) From a predetermined position of the ascending region to the standby step of the predetermined step, until a predetermined time elapses in the pressurizing step of the next and subsequent steps,
3) After a lapse of a predetermined time in the pressurizing step of the predetermined step, up to a predetermined position of the descending region to the next and subsequent pressurizing steps, 4) including at least one of a plurality of pressurizing steps , 5) from a predetermined position of the descending region to the pressurizing step of the predetermined stage, until a predetermined time has elapsed in the pressurizing step, 6) after a predetermined time has elapsed in the pressurizing step of the predetermined stage, It consists of a combination of each item up to a predetermined position of the ascending area to the standby step.

According to the fourth aspect of the present invention, the slide is pressurized at a predetermined pressure of each stage by controlling the pressure to a constant value, and then the slide is raised by a predetermined distance and waits for a predetermined time in a standby step. In a repeated multi-stage pressure motion or a repeated pressure motion, the output of a timing signal can be started (on or off) at an arbitrary pressure value and timing of each stage of the motion, so that multi-step machining or complex machining in synchronization with peripheral equipment can be performed. Precision machining becomes possible. At this time, each timing signal can be output at each stage.
That is, since the output signal is a multi-point output signal, the required number of output points of the timing signal can be reduced when output at a common timing is required in each stage. Further, since the output channel of the timing signal can be fixed, it is not necessary to change the output channel even when the number of stages changes, and the number of steps for changing hardware such as wiring change is reduced.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a timing signal control method for a direct-acting press according to the present invention will be described in detail with reference to the drawings. In the following description, an example of a servo press is shown, but the present invention is not limited to this, and may be any direct-acting press, such as a hydraulic press.

First, a first embodiment will be described with reference to FIGS. In the present embodiment, an example of a multi-stage position motion in which position control is performed in a pressing process in a multi-stage motion suitable for multi-step machining and multi-task machining is shown. FIG.
Shows a side view of an essential part showing an example of a servo press. A bed 9 is provided on the lower part of the front surface of the frame 10 of the main body of the servo press 1, and a bolster 16 is provided on the upper part of the bed 9.
Is installed. In addition, a power conversion device 14 configured by, for example, a ball screw or the like that converts rotation into a linear motion in the up-down direction is disposed at an upper portion of the frame 10, and a linear motion portion (for example, a ball screw device) of the power conversion device 14 is provided. The slide 15 is disposed at the lower end of the nut portion) and at a position facing the bolster 16 so as to be vertically movable. The upper end of a rotating part (for example, a ball screw part of a ball screw device) of the power converter 14 is connected to an output rotating shaft 11 b of the servo motor 11 via a rotation transmitting member 12. In the present embodiment, a belt (hereinafter, referred to as a belt 12) is used as an example of the rotating member 12, and the upper end of the rotating portion of the power conversion device 14 and the servo motor 1 are used.
The belt 12 is attached to each of the output rotation shafts 11b.
Pulley 12a and belt pulley 12b
Is attached. As described above, the slide 15 is driven up and down by the rotation of the servo motor 11, and the lower die (not shown) provided on the upper surface of the bolster 16 with the vertical drive of the slide 15. Pressing is performed between the slide 15 and an upper die (not shown) provided on the lower surface of the slide 15.

A speed sensor 11a such as a pulse generator is mounted on the opposite side of the output rotary shaft 11b of the servomotor 11 and coaxially with the rotary shaft 11b.
The speed signal from the speed sensor 11a is input to a servo amplifier 23 described later. The servo motor 11 is
Any of an AC servomotor and a DC servomotor may be used.

The rear end of the bolster 16 and the slide 1
Slide position detecting means 17 composed of a linear sensor such as a linear scale is disposed between the rear end portion 5 and the rear end portion. In the present embodiment, the slide position detecting means 17 has an upper end supported by the rear part of the slide 15 and the axis direction is the moving direction of the slide 15 (here, the vertical direction).
And a linear scale 17a slidably engaged with the detection head 17b at a predetermined distance from the detection head 17b. Then, as the slide 15 moves up and down, the detection head 17b moves up and down with respect to the linear scale 17a, whereby the position of the slide 15 is changed from the position detection unit inside the linear scale 17a by an optical signal from the detection head 17b. The height is detected as the height from the upper surface of the bolster 16. The position signal of the slide 15 detected by the slide position detecting means 17 is input to a controller 20 described later, and the controller 20 drives the servomotor 11 based on the position signal to
Is controlled so as to follow a predetermined motion curve.

A motion curve of a multi-stage position motion for performing positioning control in the pressurizing step is shown, for example, in FIG. In the figure, the vertical axis is represented by the position of the slide 15,
Further, the horizontal axis is represented by the elapsed time t from the start of the slide 15 at the upper limit position U. In order to perform multi-step processing and composite processing, the servo press 1 is configured such that the slide 15
In this manner, a predetermined number n of repetitive operations are performed and the machining is performed repeatedly before descending from and returning to the upper limit position U. Here, the number of repetitions is referred to as the number of steps, and the processing steps of each step are referred to as 1, 2,..., N steps (n is a natural number) in order from the first step. FIG. 2 shows an example where n = 4. At this time, the press working process by the servo press 1 includes the following processes and regions as shown in FIG. That is, a high-speed descending region in which the slide 15 descends at a high speed from the upper limit position U to the start position of the first stage machining process, a machining process of each stage repeated a predetermined number of stages n, and an end position of the last stage machining process It can be represented by a high-speed ascending region that rises at a high speed to the upper limit position U.

The machining step of each stage is performed at a predetermined low speed (from the end position of the previous stage (in the first stage, the end position of the high-speed descending region) to the lower limit position Ln of each stage (n corresponds to the number of stages). The pressurizing step in which the positioning of the slide 15 is maintained for a predetermined period of time at a lower speed lowering region where the slide 15 is lowered at the lower limit position Ln of each stage (corresponding to the pressing speed), and as a result, a predetermined pressing force is maintained. And the lower limit position L of each stage
n, a low-speed ascending region that rises at a low speed to a standby position Mn of each stage preset at a position lower than the upper limit position U;
A standby step of holding the position of the slide 15 at the standby position Mn of each stage for a predetermined time set beforehand and waiting for the start of the next processing step. Therefore, the lower speed lowering region of the next stage starts lowering from the standby position Mn of the previous stage. In the present embodiment, in the final stage, the standby process is omitted and the vehicle enters the high-speed ascending region from the standby position Mn at the end of the low-speed ascending region. However, the present invention is not limited to this. You may. Further, a pressurizing start position Kn of each stage is provided in the middle of the low speed descending region of each stage, and the pressurizing start position Kn at a predetermined speed (higher than the pressing speed) from the end position of the preceding stage (standby position Mn). After descending to the lower limit position Ln at the pressure processing speed, it is also possible to make it descend. In this case, the pressure start position Kn may be set to coincide with the end position of the preceding stage (standby position Mn or the end position of the first stage high-speed descending region).

The pressing start position Kn, the lower limit position Ln, the standby position Mn, the lowering speed, the lowering speed,
The pressure holding time (holding time in the pressurizing step), the pressing force, or the standby time (standby time in the standby step) is different for each stage based on the processing conditions of the multi-step processing and the composite processing. Value can be set. FIG. 2 shows an example of a multi-stage position motion in which the set values of the respective stages are set to different values. However, the present invention is not limited to this. For example, the set values of the respective stages are made equal as shown in FIG. It is also possible. In this case, a so-called repetitive position motion is performed in which the processing is repeated a plurality of times (n times) under the same conditions as the processing conditions of the first stage.

In the timing signal control device according to the present invention, the position and the time of the slide 15 in each step in the above-described motion curve are uniquely represented, thereby setting the ON or OFF timing of each timing signal. The output of each timing signal is controlled in synchronization with the above steps. FIG. 4 shows ON / OFF of each timing signal in the multi-stage position motion and the repetitive position motion.
A control circuit block diagram of a timing signal control device that sets an OFF condition and controls the slide 15 based on the set condition is shown, and will be described below with reference to FIG.

The slide position detecting means 17 detects the height of the slide 15 from the upper surface of the bolster 16 as described above, and outputs this position signal to the controller 20. In the present embodiment, the slide position detecting means 17 is configured by a linear sensor such as a linear scale as described above. However, the present invention is not limited to this. It may be constituted by an encoder or the like. Further, the slide position detecting means 17 may be mounted on the opposite side of the output shaft 11b of the servomotor 11 and coaxially with the rotation shaft.

The multi-stage motion setting means 21 comprises a pressurizing start position Kn, a lower limit position Ln, a standby position Mn, a low speed descending speed, a low speed rising speed, a pressurizing holding time (holding time in the pressurizing step) of each stage of the multistage motion. ) Or standby time (standby time in the standby step) and the like, and the input setting data is output to the controller 20. The setting data can be set and stored for each motion pattern corresponding to the type of the workpiece, and the motion pattern is identified by, for example, a motion number. At this time, the setting data may be input by an operator using a setting switch or the like, or may be input by communication or the like from another controller or the like that automatically controls the press working line. When inputting with a setting switch or the like, the multi-stage motion setting means 21 includes, for example, a motion number input switch for inputting a motion number assigned to each motion curve, and a position type selection for specifying a position type to be set. It can be composed of a switch, a position data input switch, and a time data input switch. These setting data are stored in a memory in the controller 20.

The multi-stage motion selecting means 22 converts the plurality of multi-stage motion patterns stored in the memory of the controller 20 into a work to be processed when performing an actual press work while operating in conjunction with the peripheral device 29. A corresponding pattern is selected, and this selection signal is output to the controller 20. This selection is designated by, for example, a motion number or the like, and may be performed by a worker using a selection switch or the like, or may be input by communication or the like from another controller for automatic line control, as described above.

The timing signal setting means 27 sets the on / off timing of each timing signal, and outputs the set value data to the controller 20. This timing is set based on the type of the process, the position of the slide 15, the number of steps, and the elapsed time from the start time of each process. The timing signal setting means 27 includes, for example, a timing signal selection switch for designating a channel of a timing signal to be set, a process type selection switch, a position data input switch, and an elapsed time data input switch.

The controller 20 is constituted by, for example, a computer device mainly composed of a microcomputer.
A readable / writable memory (for example, a semiconductor RAM, a floppy disk, a hard disk, or the like) is incorporated. The controller 20 stores the motion data input from the multi-stage motion setting means 21 and the timing setting data from the timing signal setting means 27 in a predetermined memory corresponding to each motion number. Further, based on each motion data and the set value data from the timing signal setting means 27, the on / off timing of each timing signal is calculated. At the time of press work, a control command (speed command) is output to the servo amplifier 23 that drives the servo motor 11 while inputting the drive current signal of the servo motor 11 detected by the current detection unit 24. Thus, the position and speed of the slide 15, the stop time, and the like are controlled. At the same time, the motion data and the timing setting data corresponding to the motion number input from the multi-stage motion selection means 22 are read from the memory, and the motion data process, position type, holding time, etc. The process, the slide position and the elapsed time, the position signal from the slide position detection means 8 and the actual elapsed time are compared, and the timing for turning on / off each corresponding timing signal is determined. Based on this determination result, an on / off command for each timing signal is output to the timing signal output circuit 28, and an on / off state display command corresponding to each timing signal is output to the display 25.

The servo amplifier 23 controls the rotation of the servo motor 11 by inputting the control command. The servo amplifier 23 controls either the speed of the servo motor 11 or the drive current to a predetermined value based on the control command according to the control purpose. That is, when a speed command is input, the servo amplifier 23 drives the servo motor 11 so that the deviation between the speed signal of the servo motor 11 from the speed sensor 11a and the speed command value is reduced. Output torque). When a torque command is input, the servo amplifier 23 controls the drive current of the servo motor 11 so that the deviation between the motor current value detected by the current detecting means 24 and this current command value is reduced. The motor current signal from the current detecting means 24 is fed back to the controller 20 as a motor output torque signal. The controller 20 outputs a speed command to the servo amplifier 23 when controlling the position and speed of the slide 15 based on the motion setting data, and outputs a torque command to the servo amplifier 23 when controlling the pressing force. Is output. As a result, the position and speed of the slide 15 or the pressing force are controlled.

The current detecting means 24 outputs a motor current signal corresponding to the magnitude and direction of the motor driving current.
The current detecting means 24 is configured to detect the magnitude and direction of the current based on, for example, a potential difference between both ends of a shunt resistor through which a motor current flows.

A display 25 is connected to the controller 20. The display 25 displays set data when setting on / off timing of each data of the multi-stage motion and the timing signal. The on / off state of the signal is displayed on a monitor. The display 25 may be any display such as a graphic display such as an EL display, a plasma display, or a liquid crystal display, or a number display or a numerical display such as a numerical display.

The timing signal output circuit 28 drives the output of each timing signal on / off, and drives based on an output command from the controller 20 corresponding to each timing signal. Each timing signal is output to a peripheral device 29 such as a material carry-in device or a carry-out device, and controls synchronization with the peripheral device 29.

FIGS. 5 and 6 show timing signal setting means 2.
7 correspond to a multi-stage position motion and a repeated position motion, respectively. A method for setting an output start position and an output end position of a plurality of timing signals will be described with reference to FIG.
The case where the display for setting these timings is a graphic screen is described. FIGS. 5 and 6 show examples of the setting screen and the setting switches.

First, a description will be given with reference to FIG. With the graphic screen 50, it is possible to set the multi-point output (ie, a plurality of output timings) of the timing signal of the channel number displayed in the output channel display area 71,
Can be changed. That is, a hardware output channel number is assigned to each of the timing signals according to the present invention, and the timing signals of the respective channel numbers are set by different slide positions and elapsed times in the same motion. This is a multipoint output that can repeatedly turn on / off the output at a plurality of output timings. The number of output timings that can be set (hereinafter referred to as the number of output points) is NO.
Although five points of 5 are provided, the present invention is not limited to this. For example, there may be 5 points or more. Here, it is assumed that the channel number of the timing signal to be set or changed is set in advance by a predetermined setting method. In this predetermined setting method, for example, a selection cursor 61 for selecting the channel number of the timing signal to be set or the output point is moved to the channel display area 71 by the selection keys 62 and 63, and the channel number is moved by the ten keys 65 or the like. May be input and set. Thus, the multipoint output of the timing signal of the channel number is set by the following operation.

In a predetermined display area 51 in the graphic screen 50, a graph 52 of a motion curve for which a timing signal is set is displayed with the horizontal direction as a time axis and the vertical direction as a slide position. A timing position setting cursor 59 is displayed on the graph 52, and the timing position setting cursor 5 is displayed.
9 can be moved on the graph 52 by the movement keys 53 to 56. The movement keys 54 and 55 move the timing position setting cursor 59 to the left or right in the time axis direction on the graph 52, respectively, and the movement keys 53 and 56 move the timing position setting cursor 59 to the next inflection point. 52 can be moved left or right in the time axis direction.

Then, an ON key 57 and an OFF key 58
Thus, the output start position and the output end position of each output point of the timing signal can be determined.
That is, when the cursor 59 for setting the timing position is moved to a desired predetermined position on the graph 52 by the movement keys 53 to 56, a rough slide position or elapsed time corresponding to the moved position is displayed in the ON position display area 72.
a or OFF position display area 73a. Here, the slide position represents a slide position other than the pressing step and the standby step, and the elapsed time represents an elapsed time from the start of the step in the pressing step and the standby step. The unit for setting the slide position and the elapsed time at this time is automatically set to a predetermined unit, for example, “mm” and “second”, respectively. Next, when the ON key 57 is pressed at this time, the position displayed in the ON position display area 72a is changed to the position of the timing signal.
Determines the output start position of the output point of NO.1 and turns ON
It is displayed in the position display area 72. Next, similarly, when the timing position setting cursor 59 is moved, the slide position or the elapsed time corresponding to the moved position is OFD.
It is displayed in the F position display area 73a and is OFF at a predetermined position.
When the key 58 is pressed, the position displayed in the OFF position display area 73a is determined as the output end position of the output point of No. 1 and displayed in the OFF position display area 73. The set output start position data and output end position data are stored in a predetermined memory area in the controller 20. Thus, the graph 5 is made to correspond to each output point.
2 while moving the timing position setting cursor 59 rightward in the time axis direction, the ON and OFF timings are set for the required number of outputs. In FIG. 5, the number of outputs (points) is an example of five points of Nos. 1 to 5, but is not limited to this number. The output points may be set in the order of automatically starting from the lowest number or may be selected by the selection cursor 61.

Further, when the data of the output start position and the output end position based on the rough slide position data or the elapsed time data set above is set or changed more precisely, the selection key 62 is set to the output point number to be changed. 6
After the selection cursor 61 has been moved by the
Press 4. Then, numerical data is input by operating the ten keys 65, the decimal point key 66, the CL key 67, and the like, and EN
First, change the ON data with the T key 68, then
FF data can be changed. Thus, the setting data of the timing signal corresponding to the output point number can be changed. Alternatively, similarly to the case of the above-described new setting, the timing position setting cursor 59 can be moved to a position to be changed, and the ON key 57 or the OFF key 58 can be pressed to change the position.

Next, a description will be given with reference to FIG. 6. In the case of the repetitive position motion, a repetition key 75 is further provided as compared with the case of the multi-stage position motion described with reference to FIG. The repetition key 75 can set whether to output the output of the timing signal repeatedly in conjunction with the repetition operation. That is, when the repeat key 75 is pressed in response to the timing signal of the output point number selected by the selection cursor 61, a mark (for example, ○) indicating “repeated execution” is displayed in the repeatability display area 74. . During the actual press operation, the output is repeatedly output at the same timing of the set output start position and output end position for each stage in conjunction with the repetition operation of the repetition position motion.

FIG. 7 is a block diagram showing the functional configuration of a timing signal control device for a direct-acting press according to the present invention. Each function will be described below with reference to FIG. The motion storage means 41 stores the motion data set by the multi-stage motion setting means 21 in a predetermined memory area corresponding to each motion number. Then, the timing signal setting availability determination unit 42 checks whether the output start position data and the output end position data set by the timing signal setting unit 27 are consistent with the motion data corresponding to the motion number. Then, the timing setting data is output to the timing setting value storage means 43 only when there is no contradiction. In addition,
The above-described consistency check is performed to check whether the output start position data and the output end position data input as numerical data or the like fall within a slide movement range or an elapsed time setting range of the motion. The timing setting value storage means 43 stores the timing setting data, that is, the output start position data and the output end position data, in a predetermined memory area corresponding to the motion number.

The motion selection means 44 transfers the motion data corresponding to the motion number designated by the multi-stage motion selection means 22 from the motion storage means 41 to the process judgment means 46, and transmits the timing setting data corresponding to this motion number to the timing setting data. It is transferred from the set value storage means 43 to the timing signal output determination means 47.

The process determining means 46 monitors the position signal from the slide position detecting means 17 while referring to the slide position data and the elapsed time data of each stage and each step in the transferred motion data. Then, it is determined which stage the current slide position and time point belong to and which process (for example, the low-speed descending region, the pressurizing process, the standby process, etc.), and the stage information and the process information are determined by the timing signal output determination. Output to means 47.

The timing signal output judging means 47 calculates the input stage information and process information, the timing setting data transferred from the timing setting value storing means 43,
Judgment is made from the current slide position data from the slide position detection means 17, and if it is determined that the output is to be turned on or at a time, an ON command for the timing signal is output, and the output is at the position or time to be turned off. At this time, an off command for the timing signal is output.

The timing signal output means 48 receives these ON or OFF commands and controls the output circuit to output ON / OFF the timing signal. Further, the timing signal display means 49 displays a setting data screen for setting on / off timing of each timing signal, a screen for monitoring the on / off state of each timing signal during a press-linked operation, a screen for monitoring a process, and the like. The timing signal setting data, the timing setting data, the ON / OFF command signal of each timing signal, and the like are input and displayed.

Next, a timing signal control method according to the present invention will be described based on an example of a flowchart shown in FIG. Here, S is added to each processing step number. In S1 (motion selecting means 44), the multi-stage motion selecting means 22 designates a motion number corresponding to a desired motion curve among a plurality of motion curves stored in advance, and selects a motion curve. Next, in S2, the (motion selecting means 44) reads out the motion data corresponding to the designated motion number from the motion storage means 41 and reads the motion data.
6 and read out the timing setting data corresponding to the designated motion number from the timing setting value storage means 43 and read the timing signal output determination means 47
Transfer to Thereafter, in S3, the direct-acting press 1 is started to start the interlocking operation with the peripheral device 29.

Then, in S4 (step determining means 46), the current position data of the slide 15 is input from the slide position detecting means 17 and the current elapsed time is measured. Thereafter, in S5 (step determining means 46), the position data,
The current stage number and process are determined based on the elapsed time data and the read motion data. Next, S
In 6 (timing signal output determining means 47), the output is turned on or off based on the determined process information, the slide position data, the elapsed time data in each process, and the read timing setting data. It is determined whether there is a timing signal to be performed. When the determination is NO (when there is no timing signal to turn the output on or off), the process returns to S4 to repeat the above processing. When the determination is YES, the process returns to S7 (timing signal output means 48), and according to the determination result, , The output of the timing signal is controlled to be on or off. Thereafter, the process returns to S4 to repeat the above processing.

Each of the timing signals controlled as described above is synchronized with the vertical movement of the slide 15 from a set predetermined number of steps from a slide position of a predetermined process or a start position of a machining process or a standby process. At the elapse of the predetermined time,
Output ON or OFF can be repeated. At this time,
Each timing signal can be output at each stage (that is, a multi-point output signal). Therefore, when it is necessary to output the timing signal in common at each stage, the number of output points can be reduced. In this way, the output of each timing signal is controlled on or off from any position or time of any set process to any position or time of any other process.
Then, by inputting these timing signals, the peripheral device 29 can perform the interlocking operation in synchronization with the direct-acting press.

With this configuration, any position or time point in each process can be uniquely expressed, and the process can be identified. Therefore, even in a direct-acting press in which the pressure is held by positioning in the pressing step, the synchronous operation with the peripheral device 29 can be performed, so that the press work can be automated and systemized in conjunction with the peripheral device 29. In addition, since the display of the position or time point of each process intuitively represents the operation state in the corresponding process, it is very easy for the operator to understand and the process can be easily confirmed.

Next, a second embodiment will be described with reference to FIGS. This embodiment shows an example of a timing signal control device in a multi-stage pressure motion for performing pressure control at the time of pressurization and a repeated pressure motion. 9 and 10 show a multi-stage pressure motion and a repeated pressure motion, respectively. In the figure, the horizontal axis represents the elapsed time from the start of the slide 15 from the upper limit position U, and the vertical axis represents the position of the slide 15 and the load. In FIG. 9, the press stroke at the time of pressure control includes a high-speed descending region, a processing step in which a predetermined number of steps are repeated n, and a high-speed ascending region, similarly to the multi-stage position motion in the above-described first embodiment. The machining process of each stage includes a low-speed descending region in which the slide 15 is lowered from the pressing start position Kn until a predetermined pressing force is set, and after the predetermined pressing force, the pressing force is reduced to a fixed value. A pressurizing step of holding the slide 15 at a predetermined low speed to the standby position Mn at a predetermined low speed, a standby step of holding the slide position for a predetermined time at the standby position Mn. Waiting process. Here, in the low-speed lowering region, the slide load value is monitored while the slide 15 is lowered at a predetermined low speed, and when the slide load value reaches the set pressure, the mode is immediately switched to the pressure control mode. The slide load is controlled so that the applied pressure is constant. In each of the above-described pressurizing steps, since the pressure control mode is maintained, the slide 1
5 falls at a predetermined curve. Pressurization start position Kn, low speed descent speed value, pressing force and standby position Mn of each stage
And so on can be set to different data respectively, thereby enabling precise processing in multi-step processing or composite processing.

The repetitive pressure motion shown in FIG. 10 is different from the above-mentioned multi-stage pressure motion in that the pressurizing start position Kn, the low speed descending speed value, the pressing force and the standby position M
n and the like are set equally for each stage, and the pressing step is composed of the same regions and steps as described above. That is, the processing steps of each stage include a low-speed descending region in which the slide 15 is lowered from the pressing start position K until a predetermined pressing force is set, and a pressurizing operation in which the predetermined pressing force is maintained at a constant value for a predetermined time. The process includes a low-speed raising process of raising the slide 15 to the standby position M, and a standby process of waiting at the standby position M for a predetermined time. This repetitive pressure motion enables precise processing in multi-step processing and composite processing.

An example of the timing signal setting means 27 in this embodiment is shown in FIGS. 11 and 12, respectively, and is constituted by a graphic screen and setting switches as described above. FIGS. 11 and 12 show the case of the multi-stage pressure motion and the case of the repetitive pressure motion, respectively. The same components as those in FIGS. 5 and 6 are denoted by the same reference numerals, and description thereof will be omitted. In FIG. 11, a graph of a motion curve for which a timing signal is set is displayed in a predetermined display area 51 in the graphic screen 50. A graph 52a representing a slide position in a high-speed descending region and a graph 52a A graph 52c representing the slide position in the ascending region, and a graph 5 representing the load value at the time of the machining process of each stage.
2b. Then, similarly to the previous embodiment, the timing position setting cursor 5 is moved by the movement keys 53 to 56.
9 is moved to a desired position on the graphs 52a, 52b, 52c, and the ON key 57 and the OFF key 58 are pressed at that position to set the output start position and output end position of the corresponding timing signal. At this time, the set slide position data, load value data, and elapsed time data are displayed in the ON position display area 72 or the OFF position display area 73 of the output point number.

Here, the slide position indicates a slide position in a high-speed descending area and a high-speed ascending area.
The load value represents a slide load value at the time of pressure control in the low-speed descending region and the low-speed ascending region, and the elapsed time represents an elapsed time from the start of the pressing step or the standby step. . Then, the set unit of the slide position, the slide load value and the elapsed time at this time is automatically displayed as a predetermined unit.
m "," ton "and" second ". When the set rough data is to be set or changed more precisely, the selection cursor 61 is set in the same manner as described above.
The output point number can be changed by selecting the output point number and pressing the change key 64. Similarly, the ten key 65, the decimal point key 66, the input data correction key 67, and the ENT key 68 are operated to input numerical data. Can be set.

In the case of the repetitive pressure motion shown in FIG. 12, a repetition key 75 is further provided as compared with the multi-stage pressure motion described with reference to FIG. The repetition key 75 can set whether to repeatedly output the timing signal in conjunction with the repetition operation, as described in the previous embodiment with reference to FIG. When the repeat key 75 is pressed in response to the timing signal of the channel number selected by the selection cursor 61, a mark (for example, O) indicating “repeated execution” is displayed in the repeatability display area 74, and the actual During the press work, the output is repeatedly output at the same timing of the set output start position and output end position for each stage in conjunction with the repetitive operation of the repetitive pressure motion.

FIG. 13 is a block diagram showing the functional configuration of the timing signal control device according to this embodiment. In this figure, the same components as those shown in FIG. 7 are denoted by the same reference numerals, and description thereof will be omitted. Hereinafter, only the functions different from those described above will be described. As a functional configuration in the present embodiment, a load detecting unit 45, a process determining unit 46a, and a timing signal output determining unit 47a are different. The load detecting means 45 detects a slide load. As a detection method, for example, the amount of strain applied to the frame 10 is detected by a load sensor, or in the case of a hydraulic press, the pressure value of the hydraulic chamber between the pressurizing side and the ascending side of the hydraulic cylinder driving the slide 15 is detected. It can be calculated based on the difference. In the case of an electric servo press as in the present embodiment, the actual working torque required for the actual working operation is calculated based on the motor current value, and the slide load can be obtained based on the magnitude of the actual working torque. The obtained load value data is output to the process determining means 46a.

In the step determining means 46a, the motion data corresponding to the selected motion number is inputted from the motion selecting means 44, and the slide position data of each stage and each step in the transferred motion data is obtained.
The position signal from the slide position detecting means 17 and the load value data from the load detecting means 45 are monitored with reference to the pressing force data, the set pressurizing time data and the standby time data. Then, a determination is made as to which stage the current slide position, load value and time point belong to and which process (for example, a low-speed descending region, a pressurizing process, a standby process, etc.), The signal is output to the signal output determining means 47a.

The timing signal output determining means 47
a is the input stage information and process information, the timing setting data transferred from the timing setting value storage means 43, the current slide position data from the slide position detection means 17, and the load value from the load detection means 45. Judging from the data, when it is determined that the output should be turned on, or the load value (pressurizing force), or at the time, an ON command corresponding to the timing signal is output. An off command for the timing signal is output.

Next, a timing signal control method according to this embodiment will be described based on an example of a flowchart shown in FIG. Note that, here, steps for performing the same processes as those shown in FIG. 8 are given the same process numbers. In the present embodiment, the processing in S4a, S5a and S6a is different from that described above, so this step will be described in detail. In S4a (step determining means 46a), the current position data of the slide 15 is input from the slide position detecting means 17 and the load data is input from the load detecting means 45, and the current elapsed time is measured. Thereafter, in S5 (step determining means 46a), the current step number and step are determined based on the position data, load data, elapsed time data, and the read motion data.
Next, in S6 (timing signal output determining means 47)
a) the timing at which the output should be turned on or off based on the determined process information, the slide position data, the load data, the elapsed time data in each process, and the read timing setting data. It is determined whether there is a signal channel. When the determination is NO (when there is no timing signal to turn the output on or off), the process returns to S4 to repeat the above processing. When the determination is YES, the process returns to S7 (timing signal output means 48) according to the determination result. On / off control of the output of the timing signal is performed.

As described above, the slide is positioned at the predetermined lower limit position Ln of each step and pressurized, then raised by a predetermined distance and waits for a predetermined time in a standby step, and alternately repeats this multi-position motion or In the repetitive position motion, the output of the timing signal can be started (on or off) at an arbitrary position and timing of each stage of the motion, so that precision processing such as multi-step processing or compound processing can be performed in synchronization with peripheral devices. . Similarly, in the same manner, the multi-stage motion in the pressure control mode, that is, pressurizing the slide by controlling the pressure at a predetermined pressure of each stage to a constant value, thereafter increasing the predetermined distance and waiting for a predetermined time in a standby process, In a multi-stage pressure motion or a repeated pressure motion that repeats alternately, the output of a timing signal starts (on or off) at an arbitrary pressure value and timing of each stage of the motion.
Therefore, precision processing such as multi-step processing and composite processing can be performed in synchronization with peripheral devices. Since each timing signal can be output at each stage, that is, a multi-point output signal, the required number of output points of the timing signal is small when output at a common timing is required at each stage. I can do it. Further, since the output channel of the timing signal can be fixed, it is not necessary to change the output channel even when the number of stages changes, and the number of steps for changing hardware such as wiring change is reduced.

In the above description, examples of the multi-stage position motion, the repetitive position motion, the multi-stage pressure motion, the repetitive pressure motion, and the like are shown. However, the present invention is not limited to this. Also, by the timing signal control method according to the present invention,
The same functions and effects as described above can be obtained. That is, even in the single mode, since a predetermined timing signal can be output at an arbitrary slide position, a pressing force value, and a lapse of time in the pressurizing step or the standby step, synchronization with peripheral devices can be easily achieved, and pressure control can be performed. Automation of precision processing and the like in pressure processing in the mode becomes possible. Therefore, workability and quality can be improved.

[Brief description of the drawings]

FIG. 1 is a side view showing a main part of an example of a servo press according to the present invention.

FIG. 2 shows an example of a multi-stage position motion curve of the first embodiment according to the present invention.

FIG. 3 shows an example of a repeated position motion curve of the first embodiment according to the present invention.

FIG. 4 is a control circuit block diagram of a first embodiment according to the present invention.

FIG. 5 shows an example of a timing signal setting means for a multi-stage position motion according to the present invention.

FIG. 6 shows an example of timing signal setting means for a repetitive position motion according to the present invention.

FIG. 7 is a functional block diagram of a first embodiment according to the present invention.

FIG. 8 shows an example of a control flowchart according to the first embodiment of the present invention.

FIG. 9 shows an example of a multi-stage pressure motion curve of a second embodiment according to the present invention.

FIG. 10 shows an example of a repeated pressure motion curve of a second embodiment according to the present invention.

FIG. 11 shows an example of timing signal setting means for multi-stage pressure motion according to the present invention.

FIG. 12 shows an example of a timing signal setting means for a repeated pressure motion according to the present invention.

FIG. 13 is a functional block diagram of a second embodiment according to the present invention.

FIG. 14 shows an example of a control flowchart according to the second embodiment of the present invention.

[Explanation of symbols]

1: Servo press, 9: Bed, 10: Frame, 11
... Servo motor, 12 ... Rotation transmission member, 14 ... Power conversion device, 15 ... Slide, 16 ... Bolster, 17 ... Slide position detection means, 20 ... Controller, 21 ... Multi-stage motion setting means, 22 ... Multi-stage motion selection means, 23 ... servo amplifier, 24 ... current detecting means, 25 ... display, 27 ...
Timing signal setting means, 28 timing signal output circuit, 29 peripheral equipment, 41 motion storage means, 42
... Timing signal setting availability determination means 43, Timing setting value storage means 44, Motion selection means 45, Load detection means 46, 46a Process determination means 47, 47
a ... timing signal output determining means, 48 ... timing signal output means, 50 ... graphic screen, 51 ... display area, 52 ... graph, 57 ... ON key, 58 ... OFF key, 59 ... timing position setting cursor, 61 ... selection Cursor, 64 change key, 65 numeric keypad, 66 decimal point key, 67 CL key, 68 ENT key, 71
Channel display area, 72, 72a ON position display area, 73, 73a OFF position display area, 74 repeatability display area, 75 repeat key, U upper limit position,
L, Ln: Lower limit position, M, Mn: Standby position.

Claims (4)

[Claims] After the slide (15) is lowered from the upper limit position (U) and then positioned at a predetermined lower limit position (Ln), or after the pressing force is kept constant at a predetermined processing pressure. Then, the slide (15) is raised to the upper limit position (U), and at the time of this press working, a timing signal for operating each processing step in synchronization with peripheral equipment operating in the preceding and following steps of the press machine is provided. In the timing signal control method of a direct-acting press that outputs, a predetermined slide position that is set in advance during slide descent is detected, and the predetermined position is set as an output start position of the timing signal, and the lower limit position (Ln). The time when a predetermined time has passed since the positioning was set as the output end position of the timing signal, or a predetermined pressurizing force set in advance during the slide descent is detected and the detected position is determined as the timing signal. And outputting the timing signal as a timing signal output end position at a point in time when a predetermined time has elapsed after starting to hold the pressure at the predetermined processing pressure. Timing control method for dynamic press. 2. After the slide (15) is lowered from the upper limit position (U) and then positioned at a predetermined lower limit position (Ln), or after the pressing force is kept constant at a predetermined processing pressure. Then, the slide (15) is raised to the upper limit position (U), and at the time of this press working, a timing signal for operating each processing step in synchronization with peripheral equipment operating in the preceding and following steps of the press machine is provided. In the timing signal control method of the direct-acting press for outputting, a time when a predetermined time has elapsed since the slide (15) was positioned at the lower limit position (Ln) is set as the output start position of the timing signal, and during the slide ascent. A predetermined slide position that is set in advance is detected, and this predetermined position is set as the output end position of the timing signal, or a point in time when a predetermined time has elapsed since the start of holding the pressing force at the predetermined processing pressure is set. A timing signal output start position, and a predetermined pressurizing force set in advance during slide ascent is detected, and the timing signal is output as the timing signal output end position. Timing signal control method for direct acting press. 3. Lowering the slide (15) from the upper limit position (U), then positioning the slide at a predetermined lower limit position (Ln) in a pressurizing step, raising the predetermined distance, and waiting for a predetermined time in a standby step. Then, after processing is performed by multi-stage motion in which the pressing step and the standby step are alternately performed, the slide (15) is raised to the upper limit position (U) and press-processed. A pressurizing step and a standby step, and a timing signal control method for a direct-acting press that outputs a timing signal for operating in synchronization with peripheral equipment operating in a process before and after the press machine; A timing signal control method for a linear motion press, wherein a range from a start position to an output end position is a combination of the following positions. 1) including at least one of a plurality of stages of standby processes, 2) from a predetermined position of a rising area to the standby process of a predetermined stage, until a predetermined time elapses in the pressurizing process of the next and subsequent stages. After a predetermined time has passed in the pressurizing step of the predetermined step, up to a predetermined position of the descending region to the next and subsequent pressurizing steps, 4) including at least one of a plurality of pressurizing steps, 5) from a predetermined position of a descending region to the pressurizing step at a predetermined stage, until a predetermined time elapses at the pressurizing step; 6) after a predetermined time elapses at the pressurizing step at a predetermined stage, the standby To the predetermined position of the ascending area to the process, 4. Lowering the slide (15) from the upper limit position (U), then, after maintaining a predetermined pressing force in a pressing step, raising the predetermined distance, and waiting for a predetermined time in a standby step; After processing by multi-stage motion in which the pressing step and the standby step are alternately performed, the slide (15) is moved to the upper limit position.
(U) and press working, and at the time of the press working, a timing signal for operating in synchronization with the pressurizing step and standby step of each stage and peripheral equipment operating in the front and rear steps of the press machine A timing signal control method for a direct-acting press, wherein the output start position and the output end position of the timing signal comprise a combination of the following positions. 1) including at least one of a plurality of stages of standby processes, 2) from a predetermined position of a rising area to the standby process of a predetermined stage, until a predetermined time elapses in the pressurizing process of the next and subsequent stages. After a predetermined time has passed in the pressurizing step of the predetermined step, up to a predetermined position of the descending region to the next and subsequent pressurizing steps, 4) including at least one of a plurality of pressurizing steps, 5) from a predetermined position of a descending region to the pressurizing step at a predetermined stage, until a predetermined time elapses at the pressurizing step; 6) after a predetermined time elapses at the pressurizing step at a predetermined stage, the standby To the predetermined position of the ascending area to the process,