JPH0372398B2 - - Google Patents

Description

Detailed Description of the Invention Technical Field The present invention has an upper bolster that supports an upper mold, a lower bolster that supports a lower mold,
This invention relates to a mold matching press machine in which upper and lower molds are matched by lowering an upper bolster, and the molding surfaces of both molds are inspected.

Prior Art Generally, in this type of mold matching press machine, the molding surface of either the upper mold or the lower mold is colored, and in this state the upper mold is pressed against the lower mold to match the molds. As a result, the color is transferred to the non-colored molding surface according to the unevenness on the molding surfaces of both molds, and thereby the unevenness on the molding surface can be inspected.

This mold matching is performed many times to gradually correct the molding surface. If the molding surfaces have large irregularities, a large impact load is applied multiple times between the two molding surfaces during mold matching to confirm the large irregularities. It is undesirable to apply a large impact load if only a small amount remains. In other words, if a large impact load is applied, the mold may tilt and small irregularities may not be accurately confirmed.

As related prior art, for example, Japanese Patent Application Laid-Open No. 1987-60877 discloses a mechanical press equipped with a slow-speed descending device for a slide attached to a piston rod of a fluid pressure cylinder, in which pressure oil is supplied to the upper chamber of the cylinder. A pressure air supply source is also connected to the lower chamber, and when the slide is lowered at a slow speed,
Using a control device using an electromagnetic switching valve that allows pressure oil to flow into the upper chamber while trapping pressurized air in the lower chamber without relying on mechanical force, it is possible to easily switch to slow-speed descent before hitting the workpiece during the downward stroke of the slide. A device was shown that stops the slide at a desired position, but this is a brake device for a mechanical press, and it is a vertical movement control that applies repeated pressure multiple times to the molding surface in the mold matching press to check for small irregularities. It did not suggest any means.

OBJECT OF THE INVENTION An object of the present invention is to provide a mold matching press machine that can reliably and easily inspect the presence or absence of small irregularities when the molding surface has small irregularities.

Structure of the Invention The present invention has an upper bolster that supports an upper mold, a lower bolster that supports a lower mold,
In a mold matching press machine that aligns the upper and lower molds by raising and lowering at least one of the upper bolster and the lower bolster, and inspects the molding surfaces of both molds, the upper and lower bolsters being raised and lowered. a drive means for moving one side up and down; a first control means for controlling the drive means to drive the drive means at high speed in the mold matching direction; and a position for detecting the position of the bolster moving at high speed by the first control means. a detection means; a speed switching means for switching the drive means to drive the drive means at a low speed in the mold matching direction based on a detection signal from the position detection means when the bolster moving at high speed reaches a predetermined position; A second control device in which the bolster repeatedly controls the raising and lowering operation at low speed between the mold matching position and the repetitive raising position.
The gist of the invention is to have a control means.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a hydraulic cylinder 2 as a driving means is provided in a machine frame 1 of a press machine.
An upper bolster 5 is attached to the lower end of the piston rod 3 via a ram 4. An upper mold 6 is detachably mounted and supported on the lower surface of the upper bolster 5 with its molding surface facing downward. Further, below the upper bolster 5, a lower bolster 7 is disposed on the machine frame 1 so as to be able to move up and down slightly.
As shown in FIG. 2, a lower mold 8 to be matched with the upper mold 6 is removably mounted on the upper surface of the lower bolster 7 with its molding surface facing upward. The machine frame 1 is located below the lower bolster 7.
is provided with a cushion cylinder 9 whose piston rod 10 corresponds to the lower surface of the lower bolster 7 to absorb a large impact applied to the lower mold 8.

A hydraulic pump 11 is connected to the hydraulic cylinder 2, and between the hydraulic cylinder 2 and the hydraulic pump 11, an elevation speed switching device 13 is provided as a speed switching means such as an elevation switching valve 12 and an oil amount switching valve. ing. When the elevation switching valve 12 is switched in response to the excitation of the descending solenoid 12a, pressure oil is supplied to the upper oil chamber of the hydraulic cylinder 2, the upper mold 6 is lowered, and the elevation switching valve 12 is raised. When the switching operation is performed in conjunction with the excitation of the solenoid 12b, pressure oil is supplied to the lower oil chamber of the hydraulic cylinder 2, and the upper mold 6 is raised.

Further, when the lifting speed switching device 13 is switched, the amount of pressure oil supplied to the hydraulic cylinder 2 is changed, and the lifting speed of the upper mold 6 and the lower mold 8 are changed.
The setting of the pressing force of the upper mold 6 against the upper mold 6 can be changed. That is, in this embodiment, with the switching operation of the vertical speed switching device 13, the third
As shown in the figure, the upper mold 6 descends at high speed from the highest point P1 at the upper stop position to the speed switching point P2.
From the speed switching point P2 to the mold matching point P3 that matches the lower mold 8 or the lowest point set in advance, the lowering speed is lowered, and at the mold matching point P3, the lower mold 8 is pressed with a small pressing force, and the mold matching point Between P3 and the rising point P4 of the repetitive motion, it is raised and lowered repeatedly at a low speed, and at the point P3, pressure is repeatedly applied with a small pressing force, and from the lowest point of descent or mold matching point P3 to the highest point P1, it is raised and lowered at high speed. It's becoming like that.

On the other hand, as shown in FIG.
It meshes with 6. The encoder 14 is activated as the upper mold 6 moves up and down, thereby detecting the position of the upper mold 6. Further, a limit switch group 17 consisting of a plurality of limit switches is provided on the machine frame 1 corresponding to the lifting path of the ram 4, etc., and in FIG. 1, the upper mold 6 is raised beyond the highest point P1. A safety limit switch 17a is shown as an example for sensing this and stopping the operation when the vehicle is turned off.

A control box 18 containing a control device is provided on the side of the machine frame 1, and a setting operation device 19 is installed in the control box 18. The setting operation device 19 is provided with a keyboard 20 and a setting value display board 21 as shown in FIG. You can set the distance to point P2, the distance to the lowest point, the distance from the mold matching point P3 to the rising point P4 in repetitive operation, the number of repetitions, and the pressurizing time when the upper mold 6 first descends. , these set values are displayed on each display section 21a to 21e on the set value display board 21, respectively.

Next, the circuit configuration of the control device will be explained according to FIG. 5.
The CPU 22 constitutes a microcomputer together with a ROM 23 and a RAM 24, and a program for controlling the CPU 22 is written in the ROM 23. The RAM 24 stores data for controlling the order of raising and lowering the upper mold 6 and data such as distance, number of times, and time set by the setting operation device 19.

Further, when the CPU 22 receives a position detection signal of the upper mold 6 from the encoder 14 etc. through the input port 25, it compares this with the setting data stored in the RAM 24, and outputs the signal through the output port 26. Driving circuit 2 for the descending solenoid 12a, the ascending solenoid 12b, and the vertical speed switching device 13
Drive signals are output to terminals 7, 28, and 29 as appropriate. Furthermore, when the CPU 22 receives a detection signal from the limit switch group 17,
A stop signal or the like is output to the drive circuits 27 to 29 and the like. And in this example,
In particular, both solenoids 12a by the CPU 22,
Based on the excitation control of 12b, the upper mold 6 is moved up and down between the point P3 and the point P4 shown in FIG. The contact/separation operation is repeated by the set number of repetitions.

Therefore, the operation of the mold matching press machine constructed as described above will be explained with reference to FIGS. 3 and 6.

Now, in this press machine, the upper mold 6 and the lower mold 8 are mounted and supported on both the upper and lower bolsters 5 and 7, and the molding surface of one of the molds, for example, the lower mold 8, is colored, and a start switch (not shown) is applied. do not)
When you start operation by performing operations such as
22 outputs a drive signal to the drive circuits 27 and 29 according to the operation order data written in the RAM 24, and the elevation switching valve 12 is switched to the lowering state by the excitation of the lowering solenoid 12a, and the elevation speed switching device 13 is switched to high speed state,
The upper mold 6 is lowered at high speed by the hydraulic cylinder 2 from the highest point P1 at the upper stop position (step in FIG. 6). As it descends, the encoder 14
The position detection signals of the upper mold 6 are sequentially input to the CPU 22, and the CPU 22 inputs the detection signals and the RAM.
The lowering speed switching point position data stored in 24 is compared (step), and the high-speed lowering operation of the upper mold 6 is continued until the two match.

When the upper mold 6 reaches a preset speed switching point P2 and the detection signal and the set position data match, a switching signal is output from the CPU 22 to the elevation speed switching device 13 via the drive circuit 29,
The switching device is switched to a low speed state, and the upper mold 6 is lowered at a low speed from the speed switching point P2 (step). Then, the upper mold 6 confirms the existence of the lower mold 8 (step), that is, the upper mold 6 comes into contact with the lower mold 8, and the lowering of the upper mold 6 stops under pressure. Next, when the pressurized state continues for a certain period of time (about 1 second) (step), a timer in the CPU 22 is activated, and the CPU 22
The lift solenoid 12b is energized by the switching signal from , the lift switching valve 12 is switched to the lift state, the lift speed switching device 13 is switched to the low speed state, and the upper mold 6 performs the repetitive operation stored in the RAM 24. It is raised at a low speed by the set amount of rise, for example 5 cm (step). Then, when the upper mold 6 reaches the rising point P4 of the repetitive operation,
Elevation switching valve 1 based on switching signal from CPU 22
2 is switched to the lowering state, the upper mold 6 is lowered at low speed from the ascending point P4 (step), and the CPU
The vertical speed switching device 13 is activated by the switching signal from 22.
is switched to the pressurized state, and the upper mold 6 is pressed and joined again to the lower mold 8 with a small pressing force for 0.5 seconds, which is the same time as the rising time (step). The number of repeated pressurizations is counted by the CPU 22, and the counted number is compared with the set number of repetitions stored in the RAM 24 (step) until the counted number reaches the set number of times.
-- operations are repeated.

As mentioned above, when the lowering, raising and pressurizing operations of the upper mold 6 are repeated and a predetermined number of times is reached, the CPU
22, the lift switching valve 12 is switched to the rising state, and the lifting speed switching device 13 is switched to the high speed state, so that the upper mold 6 is moved to the P
It ascends rapidly from 3 points (steps). Even during this upward movement, the CPU 22 compares the position detection signal from the encoder 14 with the origin position data of the highest point P1 from the RAM 24 (step), and the upper mold 6 continues to rise at high speed until the two match. When the upper mold 6 reaches the highest point P1, a stop signal is output from the CPU 22 to the drive circuits 27 to 29, etc., and the operation is stopped.

Note that when the lower mold 8 is not present on the lower bolster 7 and the upper mold 6 reaches the predetermined lowest point below the mold matching point P3 (step), the output from the encoder 14 is by
The CPU 22 determines this, and the ram 4 is raised at high speed in the same way as at the end of the repeated pressurization.

In this way, in the press machine of this embodiment,
Because the molding surface of the upper mold 6 is repeatedly pressed against the molding surface of the lower mold 8 with a small pressing force multiple times, the upper mold 6 may become tilted or small protrusions on the molding surface may be crushed. The coloring applied to the molding surface of the upper mold 6 is reliably transferred to the molding surface of the lower mold 6 according to the unevenness on the molding surfaces of both molds 6 and 8, without causing any It is possible to accurately inspect even the minute irregularities on the molding surfaces of Nos. 6 and 8.

Note that the present invention is not limited to the configuration of the embodiment described above, and for example, a sequence control device including a limit switch, a timer, etc. may be employed in place of the electronic control device of the embodiment described above, or a lower mold may be repeatedly operated. The invention can be modified and embodied as desired without departing from the spirit of the invention, such as by raising and lowering the molds to repeatedly bring them into contact with each other.

Effects of the Invention As described in detail above, the present invention has an excellent effect in that, when the unevenness of the molding surface is small, the presence or absence of the small unevenness can be reliably and easily inspected.

[Brief explanation of drawings]

Fig. 1 is a front view schematically showing the structure and hydraulic circuit of a mold matching press machine embodying the present invention, Fig. 2 is a partial sectional view showing an enlarged state of the mold matching state of both molds, and Fig. 3 is a An explanatory diagram of the operation for explaining the lifting and lowering state of the upper mold, FIG. 4 is a plan view showing an enlarged part of the setting operation device, FIG. 5 is a circuit diagram showing the circuit configuration of the control device, and FIG. 6 is a flowchart for explaining the operation of the upper mold. Hydraulic cylinder...2, Upper bolster...5, Upper mold...6, Lower bolster...7, Lower mold...
...8, Lifting switching valve...12, Encoder...1
4. Setting operation device...19, CPU...22,
ROM...23, RAM...24.

Claims (1)

[Scope of Claims] 1 It has an upper bolster 5 that supports an upper mold 6 and a lower bolster 7 that supports a lower mold 8, and can be moved up and down by raising and lowering at least one of the upper bolster 5 and the lower bolster 7. In a mold matching press machine which matches two molds and inspects the molding surfaces of both the molds 6 and 8, a driving means 2 for vertically driving at least one of the upper bolster 5 and the lower bolster 7; , a first control means 22 that controls the drive means 2 to drive the drive means 2 at high speed in the mold matching direction, and a position detection means that detects the positions of the bolsters 5 and 7 that are moved at high speed by the first control means 22. 1
4, a speed switch for switching the driving means 2 to drive the mold matching direction at a low speed based on a detection signal from the position detecting means 14 when the bolsters 5 and 7 moving at high speed reach a predetermined position; A mold matching press machine characterized by comprising means 13 and a second control means 22 for repeatedly controlling the raising and lowering operations of the bolsters 5 and 7 at low speed between the mold matching position P3 and the repetitive raising position P4. .