JPH0526572B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an NC device for a turret punch press that is capable of detecting the polishing time of a mold used by being attached to the turret of the turret punch press.

[Description of prior art]

In a turret punch press, the mold is a consumable item and needs to be reground or replaced at an appropriate time. By repolishing a mold at an appropriate time, its lifespan can be tripled or more, but if this is not done, its lifespan will be shortened. Note that since the punch usually starts to wear out from the side, the punch diameter becomes somewhat small, and if the polishing is done at the wrong time, there is a risk that the machining accuracy will be reduced. Therefore, repolishing the mold is an important operation in the turret punch press, and the timing for repolishing is determined by observing the wear state of the mold with the operator's eyes. In order to carry out these operations, all the molds set in the mold station must be removed one by one, and their wear conditions must be periodically inspected to determine when it is time to polish them. In places where the operating rate is extremely high, this work must be performed almost every day, and the inspection time may reduce the actual operating rate.

Therefore, it is being considered whether it is possible to know the number of times a mold has been used by the number of hits, and to know the state of wear from this integrated value. However, with current NC equipment, it is only possible to stack the number of hits for each station, and it is not possible to easily determine the appropriate mold polishing time using only the cumulative value of the number of hits. In other words, even if the number of hits is the same, the degree of mold wear varies greatly depending on the material and thickness of the workpiece material used during this hit, as well as the type of machining during the hit. Aggregate numbers do not accurately represent the history of mold wear.

[Purpose of the invention]

In view of the above-mentioned current situation, it is an object of the present invention to provide an NC device for a turret punch press that can easily determine the appropriate mold polishing time.

[Structure of the invention]

In order to achieve the above object, the present invention provides an NC device 1 for a turret punch press that automatically operates the turret punch press 3 by inputting a previously created NC machining program to the automatic operation control section 53.
The automatic operation control unit 53 is made to input the NC machining program 7 in which weights Wa and Wb regarding the material and plate thickness of each work block are written.
an NC program input processing unit 59; an arithmetic processing unit 61 that analyzes the weights Wa and Wb written in the NC machining program input to the NC program input processing unit 59; A modal table 60a that stores weights Wa and Wb, and weights related to processing types, etc.
A parameter table 69b in which Wc is registered,
Each time the mold is used, the modal table 69
an NC control data output processing unit 63 that calculates the number of times the mold is used by taking into account the weights Wa and Wb of the mold stored in a, and the weight Wc of the mold registered in advance in the parameter table 69b; This NC
It also includes a mold usage frequency storage table 69c that stores the values calculated by the control data output processing unit 63 in addition to the pre-stored current values, and
Display means 39 for displaying the number of mold usages for each mold stored in the mold usage number storage table 69c
The NC device of the turret punch press was constructed by installing the following.

Here, the weight W proportional to the degree of mold wear, which is set according to the "thickness", "material", "processing type", etc. of the workpiece material, is generally determined by the hardness of the workpiece material and the thickness of the workpiece. It is increased as the value increases, and it is also increased when the type of processing is performed under hard conditions such as nibbling. In addition, processing temperature, processing speed, surface conditions of the processing material, etc. may be considered as conditions for changing the weight.

[Explanation of Examples]

Embodiments of the present invention will be described in detail below with reference to the drawings.

Fig. 1 is an overall explanatory diagram of the device for carrying out this invention, Fig. 2 is a block diagram of the device, Fig. 3 is a module hierarchy diagram of the operating system for operating the numerical control device, and Fig. 4 is a diagram showing the module hierarchy of the operating system for operating the numerical control device. FIG. 3 is a functional block diagram of the device.

As shown in FIG. 1, a turret punch press 3 is connected to the NC device 1, and the NC device 1 is operated using an NC tape 7 created by an automatic programming device 5. In the turret punch press 3, only the mold (punch or die) portion is shown. Turret punch press 3
An example of 72 stations is shown.

As shown in Figure 2, CPU9, ROM11,
The RAMs 13 are interconnected via a system bus 15. Also, this system bus 15 has a digital simplex 17 and a digital output 1.
9, programmable controller 21, bidirectional RAM 23, two serial interfaces 25, 27, and parallel interface 29
is connected.

The CPU 9 performs overall control of the entire system under the operating system described later. The ROM 11 stores a control program, and the CPU 9 controls the turret punch press 3 and performs other processing in accordance with this program.

The RAM 13 stores data being processed by the CPU 9, and provides these data to the data requesting section when necessary.

The digital input 17 and digital output 19 are connected to a solenoid, a limit switch, etc. via a connector module 31. Note that a photocoupler is used in these signal systems as a noise countermeasure, and the system is completely isolated from the outside.

The bidirectional RAM 23 is connected to a plurality of position control modules 33 that drive the X-axis, Y-axis, turret rotation axis (T-axis), etc., and each of the position control modules 33 is connected to a servo amplifier 35. The servo amplifier 35 is connected to a drive motor M for each axis, and a tacho-generator TG and an encoder E are provided in connection with the motor M, and a feedback signal from the encoder E is sent to the position control module 33 as a speed signal from the tacho-generator TG. is returned to the servo amplifier 35.

An MDi device 41 with a CRT 39 is connected to the serial interface 25 via a CRT and MDi controller 37. Also, the serial interface 27 has a panel controller 4.
A control panel 45 is connected via 3. A tape reader 47 is connected to the parallel interface 29.

The MDi device 41 can control display data and input other key information. CRT39
In addition to displaying the current number of times the mold has been used, display contents include status display, position display of each axis, program display, and alarm display. Note that from the MDi device 41, it is possible to change the display mode, input various commands from the menu, and input keys for the NC program.

The control panel 45 displays the control status, the status of each switch, etc. using LEDs and the like, and is also capable of serial communication with the CPU 9. tape reader 4
7 is for inputting the NC program from the paper tape 7.

As shown in FIG. 3, the main control section 49 is located under the operating system 51, and includes an automatic operation control section 53 and an operation state management section 5.
5, and a CRT and MDi data control section 57 are dependent thereon. Then, the automatic operation control section 53
NC program input processing section 59, arithmetic processing section 6
1, and the NC control data output processing section 63 are subordinated thereto. The functions of each of these modules will be explained in detail with reference to FIG.

As shown in FIG. 4, the common table 65 includes a Di/D ₀ image table 67, an operation control table 69, an NC program output processing buffer 71, and an NC program calculation processing buffer 7.
3. An NC program input buffer 75 is provided. The NC program file 77 stores an NC program. In the figure, the flow of data is shown by solid lines, the flow of control signals is shown by broken lines, and the flow of control data is shown by thick arrow lines. It makes the components communicate with each other.

The operating system 51 enables the use of high-level languages and increases the extensibility of the software. Each module (process) shown in FIG. 3 operates under this operating system 51,
Scheduled efficiently in real time.

The main control unit 49 is the top-level process that performs procedures for processing by the operating system 51, initialization diagnosis of hardware modules, etc., initialization of common tables, NC programs, etc., initialization of the axis control module 33, etc. Perform this work. After the main control unit 49 performs these processes,
Three processes, the automatic operation control section 53, the operation state control section 55, and the CRT and MDi data control section 57, are activated.

The automatic operation control unit 53 is in memory mode after startup,
Controls automatic operation and program check operation according to MDi mode and tape mode. Then, a program input processing section 59 and an arithmetic processing section 61
Then, the start timing of the three processes of the NC control data output processing section 63 is controlled so that after one block's worth of input processing is processed, the processing is performed, and the results of this calculation are output.

The operating state control unit 55 is always in the RUN state,
It controls the operation status of NC devices and machines, such as Di/D ₀ processing, monitors this, and manages the status of the axis control unit, as well as timely generation of alarms and other interrupt processing.

The CRT and MDi data control section 57 controls display data for the CRT, registers NC programs, parameters, and setting data, edits, and inputs NC programs for blocks in the MDi mode.

The NC program input processing section 59 inputs the NC program in each automatic operation mode and performs format checking thereof.

The arithmetic processing unit 61 performs coordinate calculations, feed rate calculations, etc., and creates specific axis control data for the axis control module 33.

The NC control data output processing unit 63 bidirectionally outputs the axis control data processed by the calculation processing unit 61.
In addition to outputting to the axis control module 33 via the RAM 23, dwell processing and auxiliary functions (M
code) etc. Also, in this example,
The number of times the mold is used is counted here. This will be explained in detail in FIG. 5 below.

FIG. 5 shows an explanatory diagram regarding the function of updating the number of times the mold has been used. The functions of each part shown in FIG. 5 are as described above, including the modal table 69a,
The parameter table 69b and the mold usage number recording table 69c are located in the operation control table 69 shown in FIG.

Weights related to material and plate thickness for each work block
When the NC tape 7 on which Wa and Wb are written is input to the NC program input processing section 59, the arithmetic processing section 6
1 decomposes this and uses the modal table 69a to calculate the weights Wa and Wb related to material and plate thickness.
Also, the weight related to nibbling processing is described in
Wc is registered in advance in the parameter table 69b. Then, each time a mold is used (hit), the NC control data output processing unit 63 calculates the number of times the mold has been used, taking into account the weight of the mold, and uses this value as the current value in the mold use number record table 69c. It is added to the value.

The weight Wa for the material of the workpiece material varies depending on the type of material (e.g. steel, aluminum, iron, copper, etc.) and the carbon content (hardness) of the steel plate, and is generally set at 1 for ordinary steel. do. If it is harder than ordinary steel, it is set to 1.2, 1.4, etc. depending on the hardness. The weight Wb for the thickness of the workpiece material is 1.6
Define as 1 in mm and 2 in 6.0 mm. The weight Wc for the type of machining is set to 1 in the case of single punching, and a larger value is set when nibbling or other hard machining is performed. In other words, in the case of a single punch, the lateral pressure is constant and the wear of the die is not so severe, but in the case of nibbling, for example, the lateral pressure is not uniform, and a larger lateral pressure is applied to one side than in the case of a single punch.
The mold wear is severe. Therefore, even if the mold is the same, nibbling machining causes more wear on the mold than single punch machining, so if the weight for single punch machining is 1, the weight for nibbling machining is 3. It is set in advance and taken into account.

Various calculation methods can be considered, but most commonly, the number of times N of mold use is calculated as Wa per person,
It can be determined as a value proportional to Wb and Wc.

The MDi device 41 can change the contents of the table 69c via the CRT and the data control section 57 of the MDi. Moreover, this content can be read out to the CRT 39.

Although the total is performed for each station of the turret punch press, it is also possible to perform the total for each mold in consideration of the possibility of changing the mold. In this case, each mold is assigned an individual number, and a memory (which may be separate from the RAM 13 mentioned above) is prepared to record the number of times the mold is used for each individual number. The individual number of the mold is recognized, and the number of times the mold has been used in the memory is incremented each time the mold is used.
The time for polishing the mold may be determined when the number of times the mold is used approaches the maximum usable number predetermined as the time for polishing.

As a result, the number of times of use is proportional to the mold wear, taking into account the thickness, material, and processing type of the workpiece material.
Since this information can be determined by the NC device itself, inspection work that has been done regularly on all molds can now be done only on molds that have reached the number of uses that indicates the time for polishing. It is possible to achieve a significant reduction in

〔Effect of the invention〕

According to this invention, the number of times the mold is used is proportional to the wear of the mold, taking into consideration the thickness, material, and processing type of the workpiece material, and the number of times the mold is used is counted by the NC device, and it is easy to determine when to polish the mold based on this number of times the mold is used. In addition, since it is possible to properly know and properly polish the mold, it is possible to extend the mold life of the turret punch press, and it is also possible to use properly polished molds. As a result, the product accuracy can be improved.

[Brief explanation of drawings]

The drawings all show embodiments, and Fig. 1 is an explanatory diagram showing an example of an outline of a device for carrying out the invention, Fig. 2 is a block diagram of the above-mentioned device, and Fig. 3 is a diagram showing an example of an NC device used in the above-mentioned device. FIG. 4 is a functional block diagram showing in detail the functions of the device, especially the NC device, and FIG. 5 is an explanatory diagram of the mold use count update function. 3... Turret punch press (mold), 49...
...Main control section, 53...Automatic operation control section, 55...
Operating state management section, 57... CRT and MDi data control section, 59... NC program input processing section, 6
1... Calculation unit, 63... NC control data output processing unit, 69... Operation control table, 69a
...Modal table, 69b...Parameter table, 69c...Mold usage number record table,
Wa...Weight relative to the material of the workpiece material, Wb...
...Weight for the thickness of the workpiece, Wc...Weight for the processing type.

Claims (1)

[Claims] 1 The pre-created NC machining program is input to the automatic operation control unit 53 to automatically operate the turret punch press 3.
In the NC device 1, the automatic operation control section 53
In addition, the weight related to the material and plate thickness for each work block.
An NC program input processing section 59 inputs the NC machining program 7 in which Wa and Wb are written;
NC input to NC program input processing section 59
The weights Wa and Wb written in the machining program
an arithmetic processing unit 61 that analyzes the arithmetic processing unit 6;
There is a modal table 60a that stores the weights Wa and Wb analyzed in step 1, a parameter table 69b that stores weights Wc related to machining types, etc. The memorized weight Wa of the mold,
NC control data output processing unit 63 that calculates the number of times the mold is used taking into account Wb and the weight Wc of the mold registered in advance in the parameter table 69b.
and a mold usage frequency storage table 69c that stores the values calculated by the NC control data output processing section 63 in addition to the pre-stored current values. An NC device for a turret punch press, characterized in that it is provided with a display means 39 for displaying the stored number of times each mold has been used.