JPH04134219U - Mold wear detection device for hydraulic turret punch press machine - Google Patents

Abstract

(57) [Abstract] [Purpose] To develop a mold wear detection device for hydraulic turret punch presses that can extend the mold life by appropriately detecting the mold wear period and prevent the production of defective products. provide. [Structure] In a mold wear detection device for a hydraulic turret punch press machine, a means is provided to compare the press pressure with the regular press pressure, and when the press pressure exceeds the regular press pressure, it is detected that it is time to polish the mold. . The normal press pressure is N
There is a method that uses the initial press pressure associated with the start of execution of the C program, the initial press pressure set each time the mold is replaced, and reference data related to the outer circumferential length of the mold.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is a hydraulic turret pan that can appropriately detect when it is time to regrind the mold. This invention relates to a mold wear detection device for a chip press machine.

0002

[Conventional technology]

A hydraulic turret punch press machine has multiple molds mounted on a turret for mold indexing. It has a mounting station, and after mounting any mold on each mold mounting station, Rotate the turret and index the desired mold directly under the hydraulically driven ram. This is a press machine that performs press processing by driving the ram in a drawing die, and the indexing Not only can efficient press processing be performed using the mold, but the ram processing speed can also be adjusted arbitrarily. Because of this, it can be used as a low-vibration, low-noise press machine and for various molding processes. In recent years, it has been in the spotlight as a molding press machine that can do this.

0003 For this type of press machine, especially regarding the mold for punching, Therefore, mold wear can be detected by counting the number of punches and observing the occurrence of burrs. Check product accuracy, detect stripping errors, etc., and re-sharpen the mold as necessary. The number of punches required before polishing and re-polishing varies depending on the thickness of the plate, and is approximately 4 times depending on the thickness of the plate. 00 times, and approximately 50,000 times for thin plates.

0004

[Problem that the idea aims to solve]

However, the method for detecting the mold polishing time of conventional press machines as described above does not work. In order to detect the number of punches, the weight for each punch differs depending on the plate thickness, so The number of punches must be multiplied by the weight and the number of punches must be accumulated, and sudden damage due to mold breakage. There was a problem in that it could not deal with severe wear. Especially when molds are placed on the mold equipment stage. A turret punch press machine that performs processing while attached to or detached from the It is difficult to add up the number of punches for each mold, and there are various practical problems. Ta. If you overlook the appropriate time to polish the mold and continue machining with that mold, mold wear will be accelerated. This will shorten the mold life.

[0005] In addition, product accuracy must be confirmed by constantly monitoring the product, and as a follow-up measure. This inevitably leads to the problem of producing defective products. Also strip Mistakes can only be detected after the mold has worn to the point where stripping mistakes occur. The problem is that it can't be done. In this way, with the conventional method of detecting the mold polishing time, Not being able to regrind the mold at an appropriate time may result in defective products or shorten the life of the mold. was.

[0006] Therefore, the present invention aims to prevent defective products by appropriately detecting the timing of mold regrinding. Hydraulic turret punch press molds that do not create problems or shorten the mold life. The present invention aims to provide a wear detection device.

[0007]

[Means to solve the problem]

The present invention to solve the above problems is as described in the claims for utility model registration. A mold wear detection device for a hydraulic turret punch press machine was constructed.

[0008]

[Effect]

In the mold wear detection device of the hydraulic turret punch press machine of this invention, the mold indexing It has multiple mold mounting stations on the turret, each mold mounting station After mounting any mold on the Pressing is performed by driving the ram with an indexing mold while indexing directly under the ram. In a mold wear detection device for a hydraulic turret punch press machine, for example, the ram Press pressure is detected from the hydraulic pressure of the hydraulic system that drives the mold, and this press pressure is applied to the mold. Mold wear is detected by comparing with the normal press pressure.

[0009] The invention according to claim 1 is such that the regular press pressure is applied to one NC program. , is defined by the initial press pressure for one mold. Usually one NC The workpiece will not be changed when the program is executed, so in this case, the machining material and There is no need to think about board thickness.

0010 In the invention according to claim 2, the regular press pressure is adjusted to each value corresponding to the mold installation list. It is defined by the initial press pressure of the mold. The initial press pressure is based on the workpiece material. Recorded by material and board thickness. This allows each gold that is frequently attached and detached on the turret to It is also possible to reliably detect the polishing time for molds.

[0011] The invention according to claim 3 is such that the regular press pressure is applied to various molds to prevent mold wear. Data determined based on the material and thickness of the workpiece as the abnormal press pressure that occurs when The base or calculation unit specifies each press pressure according to each processing condition. This is used to detect when the mold wears out. The regular press pressure is determined for each mold. However, it may be defined by the mold shape or the mold outer circumference length. In this proposal, we will inspect the molds used. All you have to do is take it out and compare the press pressure with the official press pressure for that mold. It is easy to manage the list of installed molds. In addition, the regular press pressure can be found in the database, for example. Since it is specified in the standard, it is easy to manage and the mold status can be monitored reliably.

0012

【Example】

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. This example as shown in Figure 1 The hydraulic turret punch press machine 1 has a so-called bridge type frame 2. This frame 2 includes upper and lower turrets 3 and 4.

The upper and lower turrets 3 and 4 are rotatable in a plane around a vertical axis 5, and as shown in an enlarged plan view in FIG. 2, a number of mold mounting stations S _i (i=1, 2... 21).

The mold installed in each mold installation station S _i is indexed directly below the ram 6 and performs a predetermined process on a workpiece W guided between the turrets 3 and 4. It is supposed to be done. A striker 7 is provided below the ram 6 and is movable in accordance with the mold position on each track of the turrets 3 and 4.

[0015] The work W is held by the work clamp device 8 and is positioned on the XY coordinates on the table 9. The position of the workpiece W to be processed is moved directly below the striker 7. subordinate Therefore, by operating the work clamp device 8 and lowering the striker 7, , it is possible to perform predetermined processing with an indexing die.

[0016] FIG. 3 is a circuit diagram of a hydraulic system that drives the ram 6 up and down. As shown, The ram 6 is driven by a cylinder device 10. A pair of pipes OL1 and OL2 are connected to the upper and lower chambers of 0. OL2 is connected to a hydraulic pump 12 via a servo valve 11. Therefore, the service The oil supply or oil drain operation of piping OL1, OL2 can be changed by switching the valve 11. In addition, the ram 6 can be moved up and down with a predetermined stroke. Also, servo valve By adjusting the opening degree of the valve 11, the ram 6 can be controlled at a desired speed. Ram 6 In order to control the speed and stroke, a pulse signal is generated according to the amount of movement. An encoder 13 is provided. An oil pressure sensor 14 is connected to the pipe OL1. , the oil pressure during pressing is detected.

[0017] In the above hydraulic turret punch press machine 1, an NC program is installed in the NC device. When input, the NC device analyzes the code written on the NC program and executes the specified code. The mold mounting station is indexed directly below the ram 6 (striker 7) and the work to be processed is With the arc inserted between the indexing molds, the ram 6 is lowered to perform punching. this The press pressure at the time can be detected by detecting the oil pressure of the pipe OL1. . Press pressure is the oil pressure multiplied by the cylinder area, but the oil pressure itself can be substituted. You can also

Note that when the NC program is input to the NC device and executed, press working is executed as described above, so a mold of a predetermined shape is pre-installed in the mold mounting station S _i of the turret. Must be set. For this purpose, a piece of paper called a work slip is attached to the NC program, and the operator refers to this piece of paper to mount a predetermined mold at a predetermined station S _i . This work is called mold setup work.

[0019] Figure 4 shows an integrated model with the NC device that controls the hydraulic turret punch press machine 1. FIG. 2 is a block diagram showing an example of the configuration of a mold wear detection device.

The mold wear detection device 15 of this example includes an analog/digital (A/D) converter 16 that converts the pressure detected by the oil pressure sensor 14 into a digital value, and a press pressure P via this converter 16. ₂ is provided with a press pressure detection section 17 that detects pressure.

The press pressure detection section 17 is connected to an initial press pressure storage section 18 for each mold and a comparison section 19 . An installed mold list storage section 20 is connected to the initial press pressure storage section 18 for each mold, and an initial press pressure setting section for the currently used mold is connected between the comparison section 19 and the initial press pressure storage section 18 for each mold. 21 is interposed. The mounted mold list storage unit 20 lists the state of the molds mounted on the turrets 3 and 4, and as shown in FIG. 5, identifies the mounted mold corresponding to the station number S _i . . As shown in FIG. 6, the mold-by-mold initial press pressure storage section 18 stores the initial press pressure for each mold, that is, the press after the mold is mounted, in correspondence with the station number S _i . This initial press pressure is classified and stored according to the material and thickness of the workpiece. When converting a mold, all the initial press pressures for that mold (station) are cleared, and when a mold is subsequently installed in that station, the initial press pressures for each material and plate thickness are sequentially written in the blank space. This is how it will go. The currently used mold initial press pressure setting section 21 refers to the execution state of the NC program, learns the mold, material, and plate thickness related to the current processing, and stores the contents of the initial press pressure storage section 18 for each mold regarding the processing. is searched and set in the comparison section 19 as the initial press pressure _P1 .

A reference value storage section 22 and a mold wear signal output section 23 are connected to the comparison section 19 . The reference value storage unit 22 stores a reference value ΔP ₀ to be compared with |P ₁ −P ₂ |. The comparison unit 19 inputs numerical values P ₂ , P ₁ , and ΔP ₀ from the press pressure detection unit 17 , the currently used mold initial press pressure setting unit 21 , and the reference value storage unit 22 , respectively, and calculates |P ₁ −P ₂ | >ΔP ₀ is determined, and if "Yes", the wear state of the mold is known. The mold wear signal output section 23 converts this state into a signal and outputs it to the mold wear processing section of the NC device.

FIG. 7 shows the operation of the mold wear detection device 15. That is, in step 701, it is determined whether or not the mold is installed in station S _i for mold replacement, and for the replaced mold, the initial press pressure P ₁ is recorded in step 702, and in the second and subsequent machining, step 703 is recorded. The press pressure is detected as P ₂ at step 704, and |P ₁ −P ₂ |>ΔP ₀ is determined at step 704. When this is "Yes", the process moves to step 705, where the mold wear processing section of the NC device temporarily stops the NC device and outputs a message for replacing the mold. FIG. 8 shows an example of a message displayed on the CRT screen 24.

[0024]Thus, the operator can refer to the message shown in FIG. 8 to know which mold is worn out, and can continue machining by replacing the mold as appropriate. Since worn molds are removed from station S _i and reground, the life of the mold can be extended, and no defective products are produced due to worn molds.

[0025] However, replacing the mold is quite a difficult task and requires a considerable amount of time. shall be. However, in some cases, all machining can be completed with just a few punches. There are also cases. In such cases, processing should be continued even if it is a little difficult. This way In this case, continue machining from the machining status as shown below the message in Figure 8. In order to continue machining after confirming that it is possible to Just press the start button. In this case, the corresponding mold will be replaced. The flow shown in Figure 7 is started, and the initial press is started for the first punch. pressure is set. In this way, the wear will be too great again. It is possible to prevent mold wear from progressing by outputting a message every time.

[0026] As described above, according to the mold wear detection device shown in Fig. 4, the mold polishing timing can be appropriately determined. Since it can be detected, the life of the mold can be extended and there will be no defective products. In addition, in this example, the initial press pressure for each mold is recorded for each workpiece material and plate thickness, and compared. Because it compares not only one NC program but also multiple programs that are executed sequentially. We can handle the following NC programs.

In the above embodiment, the mold initial press pressure storage unit 18 is provided that can record the initial press pressure for each material and plate thickness in order to correspond to multiple NC programs, but each station S If the initial press pressure is recorded in accordance with _i , the workpiece will not normally be changed during the execution of one NC program, so recording for each material and plate thickness can be omitted, and mold wear can be detected. The configuration of the device 15 can be simplified.

[0028] FIG. 9 is a block diagram showing a configuration example of a mold wear detection device according to another embodiment of the present invention. It is a diagram.

The mold wear detection device 25 of this example is provided with a comparison section 26 different from that shown in FIG. 4, and a reference value generation section 27 connected thereto. By comparing the standard press pressure P ₀ generated by the press pressure P ₁ with the press pressure P 1 , mold wear is detected when P ₁ ≧P ₀ .

The reference value generation unit 27 may be configured with a database in which reference values are stored separately for each mold, material, and plate thickness, but processing is performed based on mold polishing time reference data as shown in FIG. The reference value P ₀ may be determined by calculation according to the mold, material, and plate thickness at the time.

In FIG. 10, the horizontal axis is the mold outer circumference length (which can also be determined by the mold diameter), and the vertical axis is the mold polishing time obtained by multiplying by a coefficient α (α>1), which is the so-called punching capacity. It shows the standard value (ton). That is, mold wear can be detected when the actual press pressure P ₁ exceeds the value shown in this graph. The figure is calculated assuming an expansion force of 40 kg/mm, which roughly corresponds to SS material. For stainless steel materials, it is recommended to use a value approximately 1.5 times this value, and for aluminum materials, it is recommended to use a value approximately half this value. The reference value P ₀ does not have to be one, but a plurality of values indicating the degree of wear can be defined.

FIG. 11 is a flowchart showing the operation of the mold wear detection device 25 shown in FIG. In step 1101, the press pressure P ₁ of the actual processing is detected, and in step 1102, it is compared with the reference value P ₀ generated by the reference value generation section 27, and when P ₁ > P ₀ , the process moves to steps 1103 and 1104, A message similar to that shown in step 705 and subsequent steps in FIG. 7 is output.

In the mold wear detection device 25 of this example, the reference value P ₀ can be accurately indicated by data as shown in FIG. 10, so that the mold wear period can be detected more appropriately. Moreover, if the data shown in FIG. 10 is set, there is no need to provide the initial press pressure storage section 18 for each mold to store the installed mold list as shown in FIG. 4, so that the configuration becomes simpler.

[0034] The present invention is not limited to the above embodiments, and design changes may be made as appropriate. Therefore, it can be implemented in any appropriate manner.

[0035]

[Effect of the idea]

As mentioned above, the present invention is a hydraulic turret as described in the claims for utility model registration. This is a die wear detection device for punch press machines, so it is possible to determine when to polish the die during processing. can be properly detected, extend the mold life, and make defective products. Never.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the external structure of a hydraulic turret panta press machine.

FIG. 2 is an enlarged plan view of the turret showing the arrangement of mold mounting stations on the turret of the hydraulic turret punch press machine.

FIG. 3 is an explanatory diagram of the hydraulic system that drives the ram of the hydraulic turret punch press.

FIG. 4 is a block diagram showing an embodiment of the mold wear detection device of the present invention.

FIG. 5 is an explanatory diagram showing the stored contents of a mounted mold list storage section of the mold wear detection device.

FIG. 6 is an explanatory diagram showing the stored contents of an initial press pressure storage section for each mold of the mold wear detection device.

FIG. 7 is a flowchart showing the operation of the mold wear detection device.

FIG. 8 is an explanatory diagram of a message screen of the NC device displayed by mold wear detection by the mold wear detection device.

FIG. 9 is a block diagram showing a mold wear detection device according to another embodiment of the present invention.

10 is an explanatory diagram of mold polishing timing reference data used in the mold wear detection device shown in FIG. 9; FIG.

FIG. 11 is a flowchart showing the operation of the mold wear timing detection device shown in FIG. 9;

[Explanation of symbols]

6 Ram 7 Striker 10 Cylinder device 14 Oil pressure sensor 17 Press pressure detection part 18 Initial press pressure memory section for each mold 19 Comparison section 20 Installed mold list storage unit 21 Currently used mold initial press pressure setting section 22 Reference value storage section 24 Message screen 26 Comparison section 27 Reference value generation section

Claims (3)

[Scope of utility model registration request] Claim 1: A plurality of mold mounting stations are provided on a turret for indexing molds, and each mold mounting station is equipped with an arbitrary mold, and the turret is rotated to place an arbitrary mold. In a mold wear detection device for a hydraulic turret punch press machine that indexes directly under a hydraulically driven ram and performs pressing by driving the ram with an indexing mold,
After one NC program is input to the NC device that controls the turret punch press machine, an initial press pressure storage unit is provided to record the initial press pressure for each mold when the NC program is executed, and for each mold. In the second and subsequent press processes, each press pressure is compared with the first press pressure stored in the first press pressure storage section, and when the difference is greater than a predetermined reference value, a mold wear signal is generated. A mold wear detection device for a hydraulic turret punch press machine, characterized by having a comparison section. 2. A plurality of mold mounting stations are provided on a turret for indexing molds, and each mold mounting station is equipped with an arbitrary mold, and then the turret is rotated to place an arbitrary mold. In a mold wear detection device for a hydraulic turret punch press machine that indexes directly under a hydraulically driven ram and performs pressing by driving the ram with an indexing mold,
A mounted mold list storage unit is provided that stores a mounted mold list indicating the contents of the molds mounted on each mold mounting station, and a mounted mold list storage unit is provided to store a mounted mold list indicating the contents of molds mounted on each mold mounting station, An initial press pressure memory unit is provided to store the initial press pressure after the current press is set at the mold mounting station for each material and plate thickness of the workpiece, and the initial press pressure for each mold set at each mold mounting station is stored. For the second and subsequent press processes, compare each press pressure for each material and plate thickness of the workpiece,
A mold wear detection device for a hydraulic turret punch press machine, comprising a comparison section that generates a signal of mold wear when the difference is larger than a predetermined reference value. 3. A plurality of mold mounting stations are provided on a turret for indexing molds, and each mold mounting station is equipped with an arbitrary mold, and the turret is rotated to place an arbitrary mold. In a mold wear detection device for a hydraulic turret punch press machine that indexes directly under a hydraulically driven ram and performs pressing by driving the ram with an indexing mold,
The NC device that controls the turret punch press machine is equipped with a mold detection unit that detects the mold currently in use.On the other hand, the abnormal press pressure that occurs when mold wear occurs for various molds is detected by the material of the workpiece. and a database or calculation unit determined for each plate thickness, and for the mold detected by the used mold detection unit, the press pressure by the mold is compared with the abnormal press pressure specified by the database or calculation unit. 1. A mold wear detection device for a hydraulic turret punch press machine, comprising: a comparison section that generates a signal of mold wear when press pressure approaches or exceeds abnormal press pressure.