JPH0129658B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention provides a numerical control system in which an indexing table is installed in a machine equipped with a numerical control device (hereinafter referred to as an NC machine) having a numerical control function, so that control including rotation angle can be performed. It is related to machine equipment.

Here, the NC machine is a device that automatically performs various types of processing in one setting according to instructions from a numerically controlled tape. As an example of an NC machine, when machining a cylindrical member such as a shaft using a machining center that has a simultaneous three-axis control function that controls the movement of the tool in the front, back, left, right, and up and down directions relative to the workpiece, the As shown in FIG. 1, an indexing table is provided. In FIG. 1, the tool 2 of the machining center 1 is controlled to move in the vertical direction (arrow Z direction), and the horizontal table 4 on which the indexing table 3 is placed is moved in the front-rear direction (arrow Y direction) and left-right direction (perpendicular to the plane of the paper). The movement is now controlled in the following directions: In addition, the indexing table 3 is a workpiece whose rotation is controlled by a rotary table 5 around an axis perpendicular to the plane of the paper (hereinafter referred to as the X direction), and thereby fixed at the center of the rotary table 5 in a posture extending in the X direction. (shaft, etc.) rotation is now controlled. It should be noted that what the worker 6 holds in his hand is an operation panel 7 (pendant) for inputting the work process into the indexing table 3 in advance.

Conventionally, in numerically controlled machining equipment in which a machining center 1 having a simultaneous three-axis control function is provided with an indexing table 3 to perform four-axis control including rotation angle, the machining center 1 and the indexing table 3 are Connected as shown. In Fig. 2, 8 is the controller (microcomputer) of the machining center 1, and 9 is the operation panel 7.
A controller (microcomputer) for the indexing table 3 having functions such as storing commands from the index table 3, 10 a power source for supplying power to the controller 9, 11 a feed motor, and 12 an encoder that converts the rotation of the motor into pulses. , 13 is a reduction gear, 14 is a worm gear for rotating the rotary table 5, 15 is a pneumatic brake cylinder for braking the table 5, and 16 is a brake confirmation sensor.

When commands from a numerical control tape (not shown) are input to the controller 8, the tool 2 and the horizontal table 4 (both shown in Figure 1) move according to the commands, thereby simultaneously controlling three axes in the front, back, left, right, and up and down directions. will be carried out. Then, the controller 8 outputs a start signal S to the controller 9 of the index table 3 as necessary. The controller 9, which has received the start signal S, rotates the feed motor 11 in accordance with the command input and stored in advance through the operation panel 7.
The rotary table 5 is rotated via the reduction gear 13 and the worm gear 14. The rotation of the feed motor 11 is converted into electric pulses by the encoder 12 and input to the controller 9. The controller 9 counts the pulses and compares them with the stored commands while controlling the feed motor 1.
Controls the rotation of 1. On the other hand, in the machining center 1, the horizontal table 4 shown in FIG. 1 is controlled to move in the X direction (direction perpendicular to the plane of the paper) in response to a command from the controller 8. As a result, the workpiece fixed to the rotary table 5 in the axial direction is controlled simultaneously in the axial direction (X direction) and rotational direction, and complex machining is performed on the cylindrical surface etc. Ru. When the execution of the command stored in the controller 9 of FIG. 2 is completed, the controller 9 outputs a rotation completion signal F to the controller 8. Rotation completion signal F
The controller 8 that receives the input starts the next operation.

In this way, in the conventional numerically controlled machining device, the machining center 1 and the indexing table 3 are linked. However, in the conventional configuration described above, after the controller 9 receives the start signal S, the controller 8 independently controls the machining center 1.
The controller 9 also controls the index table 3.
As a result, there is a problem in that the relationship between the axial movement and rotation of the workpiece is likely to be misaligned, making it impossible to perform accurate machining. In particular, an unavoidable time lag occurs between when the controller 8 outputs the start signal S and when the rotary table 5 is rotated by the controller 9. Conventionally, in order to eliminate this lag, only the experience and intuition of the operator has been relied upon. work is being carried out.

In view of the above-mentioned problems, the present invention has been developed by controlling the NC machine and the indexing table with one controller (microcomputer), thereby eliminating deviations in the relationship between the axial movement and rotation of the workpiece and ensuring accuracy. The purpose of this invention is to provide a numerically controlled machining device that can perform various types of machining and can be adopted at a lower cost than conventional ones. Explain.

In FIG. 3, the controller 8 of the machining center 1 selects the output pulse MP from the conventionally equipped manual pulse generator 17 and the output pulse SP from the SV card 20 of the controller 19 of the indexing table 18, which will be described later. A switching circuit 21 is provided.

On the other hand, in the controller 19 of the indexing table 18, the PCP card 22 (microcomputer, built-in memory) inputs the command signal from the operation panel 23, inputs the start signal S from the controller 8, and sends the rotation completion signal F to the controller 8. It also has the function of outputting a work signal to the SV card 20, which will be described later, and inputting a work completion signal from the SV card 20. SV card 20 (servo control card) is interpolator 24
Built-in, output pulse to controller 8
SP, outputs a feed motor operation signal to the PGD card 25, which will be described later, and
It has a function of inputting pulses from an encoder 27 that detects the rotation of the motor. PGD card 25
(gate driver card) has a function of converting the feed motor operation signal from the SV card 20 into an analog signal and outputting it to the power amplifier 28. The power amplifier 28 operates the feed motor 26 by controlling power from a power supply control section 29 connected to an external power supply. Feed motor 26
is connected to the rotary table 31 of the index table main body 30, and rotates the workpiece 32 fixed in the X direction (axial direction) at the center of the table 31 in the θ direction. An encoder 27 is further connected to the feed motor 26, and outputs the rotation of the motor 26 as a pulse to the SV card 20.

Next, the operation will be explained. The operation panel 23 shown in FIG. 3 provides information on the rotation of the rotary table 31 in advance.
For example, information on the movement of the machining center 1 in the X direction is input into the PCP card 22 in a predetermined manner and stored. When a command from a numerical control tape (not shown) is input to the controller 8, the machining center 1 moves the tool 2, etc. in accordance with the command, and performs simultaneous three-axis control in the front, back, left, right, and up and down directions. When a start signal S is outputted from the controller 8 to the controller 19 of the indexing table 18 in response to a command from the numerical control tape, the indexing table 18 starts operating.

Start signal S is PCP in controller 19
When input to the card 22, the PCP card 22 receives the work information stored in advance by the operation panel 23.
A work signal is output to the SV card 20. Upon receiving the work signal, the SV card 20 converts the signal using an interpolator 24 and outputs a feed motor operation signal to the PGD card 25, while outputting an output pulse SP to the controller 8 via the switching circuit 21. The controller 8 inputting the output pulse SP controls the machining center 1 based on the information, and moves the workpiece 32 in the X direction as specified. On the other hand, the feed motor operation signal was input.
The PGD card 25 converts the signal into an analog signal, controls the power amplifier 28, and rotates the feed motor 26 as specified. The rotary table 31 is rotated by the rotation of the motor 26, and the workpiece 32 is rotated in the θ direction in a predetermined manner.
The rotation of the feed motor 26 is converted into pulses by an encoder 27 and input to the SV card 20.
The SV card 20, which receives the pulse from the encoder 27, outputs a work completion signal to the PCP card 22, and the PCP card 22 receives the output.
Determine whether all the work based on the stored information has been completed, and if it is not completed, send the next work signal.
The rotation is output to the SV card 20, and when the rotation is completed, a rotation completion signal F is output to the controller 8. The controller 8 receives the rotation completion signal F and starts the next operation.

A flowchart for carrying out the above processing operations is shown in FIG. Note that P ₁ to _{P 7} in FIG. 4 indicate each step of the flowchart. Controller 19
The control calculation shown in FIG. 3 is executed every time the start signal S from the controller 8 is received. In Figure 4, when the start signal is input at P ₁ , if the work is completed based on the memory of the work process input in advance, the process goes to P ₇ , and if it is not completed, the feed motor is activated at P ₃ . At the same time, _P5 outputs the operating pulse to the machining center. _P6 is a process on the machining center side, where the machining center receives an operating pulse and operates according to the pulse. On the other hand, if the feed motor operates at P ₃ , the encoder operates at P ₄ and outputs pulses corresponding to the rotation of the feed motor to the controller (index table side). The controller that receives the pulse determines whether the work is completed at P ₂ , and if it is not completed, executes P ₃ and P ₅ again, and if it is completed, outputs a rotation completion signal to the machining center controller at P ₇ . Then, the control program ends.

As explained above, according to the present invention, a machine equipped with a numerical control device (hereinafter referred to as machining center 1) having a control function of one or more axes for controlling the movement of tool 2 relative to workpiece 32 is provided with a In a numerically controlled machining device, an indexing table 18 is provided which converts and interlocks signals such as a start signal S, a rotation end signal F, a manual pulse switching signal MP, etc., and enables control including the rotation angle θ. , the above-mentioned index table 18 is connected to the controller 19
The controller 19 includes a microcomputer (hereinafter referred to as a PCP card 22) and a servo control card 20 connected thereto.
The PCP card 22 includes a program that defines the amount of rotation of the workpiece 32 and the amount of movement in a predetermined direction,
The servo controller 20 includes an interpolator 24 that converts and outputs a work signal from the PCP card 22.
Connect to the controller of machining center 1,
The workpiece 3 is controlled by using the control function of one axis (for example, the X-axis) of the axis control functions of the machining center 1.
2, the machining center 1 and indexing table 18 can be controlled simultaneously.

According to the above structure, the PCP card 22 is equipped with a program that defines the amount of rotation and the amount of movement of the workpiece 32 in a predetermined direction, so as shown in FIG. A work signal can be output to the porator 24 based on movement information in one axis (for example, in the X direction) and rotation information on the workpiece 32. Therefore, the interpolator 24 can output the feed motor operation signal to the PGD card 25 and output the output pulse SP to the switching circuit 21 of the controller 8. As a result, the controller 8 controls one of the axis control functions of the machining center 1.
The workpiece 32 can be driven using the axis control function (in the embodiment, a structure is shown in which the workpiece 32 is driven in the X direction in FIG. 3 using the X-axis control function). ). Therefore, in the present invention, since the tool 2 and the workpiece 32 are driven by the same control function, there is no risk of error occurring between the axial movement of the workpiece 32 and the movement of the tool 2, and accurate processing can be carried out.

Moreover, since a single-axis control function is used, the structure is not only simplified and implementation is easier, but also product failures are less likely to occur. Furthermore, by using a single-axis control function, it is also possible to reduce manufacturing costs.

Note that in the above embodiment, the manual pulse generator 17
The output MP from the SV card 20 and the output pulse SP from the SV card 20 are switched to the switching circuit 21 to input the pulse SP to the controller 8. However, if the controller 8 is provided with an input terminal for the pulse SP in advance, , the terminal and the SV card 20 may be directly connected. Further, a cross table having a simultaneous two-axis control function corresponding to the horizontal table 4 shown in FIG. 1 is already known. A cross table has conventionally been used as an attachment in a machining center, but if you take advantage of its simultaneous two-axis control function and use one axis control function to control the rotational direction, you can achieve the same function as in the above embodiment. be able to. Therefore, this configuration is also an embodiment of the present invention.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of the right side of a general numerically controlled machining device, Fig. 2 is a block diagram of a conventional example, Fig. 3 is a block diagram of a numerically controlled machining device according to the present invention, and Fig. 4 is a flowchart showing the control process. It's a chat. 1... machining center, 2... tool, 8... controller (for machining center), 18... indexing table,
19...Controller (for indexing table), 20
...SV card (servo control card), 22
...PCP card (microcomputer), 24...
Interpolator, 26...Feed motor, 32
...Workpiece, F...Rotation completion signal, S...Start signal, SP...Output pulse.

Claims (1)

[Claims] 1. A start signal,
In a numerically controlled machine device that is equipped with an indexing table that interlocks by exchanging signals such as a rotation end signal and a manual pulse switching signal, so that control including the rotation angle can be performed, the indexing table is equipped with a controller. , the controller is equipped with a microcomputer and a servo control card connected thereto, the microcomputer is equipped with a program that defines the rotation amount and the amount of movement of the workpiece in a predetermined direction, and the servo controller is Equipped with an interpolator that converts and outputs work signals, the interpolator is connected to the controller of a machine equipped with a numerical control device, and the control function of one of the axis control functions of the machine equipped with a numerical control device is used. A numerically controlled machining device characterized in that a machine equipped with a numerically controlled device and an indexing table can be simultaneously controlled by controlling a workpiece.