JP2020151737A - Quality determination method of thin plate press processing part, quality determination device of thin plate press processing part and press processing system - Google Patents

Abstract

To enable high-degree of determination of a press processing quality.SOLUTION: A quality determination method of a thin plate press processing part has steps of: measuring a punch load and a die load when press-processing a thin plate by relative direct advance movement of a punch 21 and a die 22 by a sensor 3B arranged in a sensor 3A and the die 22 arranged in the punch 21; and determining a quality of a thin plate restriction processing part from a measured punch load and a measured die load based on a map associating a combination of the punch lod and the die load with a characteristic of processing.SELECTED DRAWING: Figure 6

Description

The present invention relates to a method for determining the quality of stamped thin sheet parts, a quality determining device for pressed thin sheet parts, and a press working system.

Stamping of thin plates using a press die device is widely used. Various measures have been conventionally taken in order to improve the dimensional accuracy of press-formed products.

For example, Japanese Patent Application Laid-Open No. 2009-12043 describes a press die apparatus in which a sensor for measuring elastic strain generated in the normal direction of a thin plate is provided inside at least one of a pressurizing surface of a punch and a die in the die. Disclose. When the strain measured by the sensor at the bottom dead center of press molding is out of a predetermined range, an abnormality in press molding is determined.

JP-A-2009-12043

The determination method disclosed in Japanese Patent Application Laid-Open No. 2009-12043 is a method for relatively easily determining an abnormality in press molding. However, in the case of stamped parts that require high quality, a more advanced determination method is required.

An object of the present invention is to enable a high degree of determination of press working quality.

According to an example of the present disclosure, in the quality determination method of a thin plate stamped part, a punch load and a die load when the thin plate is pressed by the relative linear movement of the punch and the die are set on the punch. From the measured punch load and die load based on the step measured by the sensor and the second sensor provided on the die, and the map associating the combination of punch load and die load with the characteristics of stamping. It includes a step of determining the quality of stamped thin plate parts.

According to the above, since the quality of press working is determined based on the combination of the punch load and the die load, a high degree of determination is possible.

Preferably, the measuring step is a step of generating a trigger for measuring the load value when the load value reaches a preset threshold value for at least one of the punch load and the die load, and a predetermined time from the activation of the trigger. Includes a step of acquiring the load value after the elapse of as the bottom dead center load value.

According to the above, the load value at the bottom dead center can be detected without detecting the crank angle of the press machine. Therefore, on the press side, the configuration for the output of the crank angle can be eliminated.

Preferably, the step of acquiring the load value includes a step of sampling the load value within a predetermined period and a step of averaging a plurality of values acquired by the sampling to obtain the load value.

According to the above, it is possible to obtain the load value more accurately by obtaining the average of the load values detected by the sensor.

According to an example of the present disclosure, the quality determination device for the thin plate pressed parts includes a first sensor provided on the punch for measuring the punch load, a second sensor provided on the die for measuring the die load, and the like. A storage unit that stores a map that associates the combination of punch load and die load with the characteristics of press processing, the punch load measured by the first sensor, the die load measured by the second sensor, and It is provided with a determination unit that determines the quality of the thin plate pressed parts based on the map.

According to the above, since the quality of press working is determined based on the combination of the punch load and the die load, a high degree of determination is possible.

According to an example of the present disclosure, the press working system includes the above-mentioned quality determination device for thin sheet stamped parts and a press machine having a punch and a die.

According to the above, it is possible to manufacture stamped parts that require high quality.

According to the present invention, it is possible to highly determine the press working quality.

It is a figure which schematically exemplifies an example of the application scene of the press working system which concerns on this embodiment. It is a schematic diagram which illustrated the arrangement of the sensor in a mold. It is a block diagram which shows the configuration example of a control device. It is a figure which showed an example of a map. It is a figure which showed the example which acquired the load value from the signal of a sensor. It is a figure which showed the flow of the quality determination method.

§1 Application example An example of a situation in which the present invention is applied will be described with reference to FIG. FIG. 1 is a diagram schematically illustrating an example of an application scene of the press working system 100 according to the present embodiment. The press working system 100 presses a thin metal plate. As an example, the press working system 100 performs thin plate drawing.

As shown in FIG. 1, the press working system 100 includes a press machine 1. The press machine 1 includes a die 2 and a sensor 3 installed in the die 2. The sensor 3 detects the load generated during the press working of the thin plate by the die 2. As will be described in detail later, the mold 2 has a punch and a die. Sensors are provided on each of the punch and die. In FIG. 1, the sensors provided on each of the punch and the die are collectively referred to as “sensor 3”.

The press working system 100 further includes a signal conditioner 5, a high-speed analog input unit 6, an I / O power supply addition unit 7, and a control device 8. The signal from the sensor 3 is input to the high-speed analog input unit 6 through the signal conditioner 5. The high-speed analog input unit 6 acquires analog data indicating a load value by receiving an output signal from the signal conditioner 5.

In the present embodiment, the sensor 3 and the control device 8 realize a quality determination device for stamped thin plate parts. For example, the control device 8 can be realized by a PLC (Programmable Logic Controller). The control device 8 acquires the load value detected by the sensor 3 and refers to the map stored in the control device 8. The map associates the load value with the quality of machining characteristics in advance. The control device 8 determines whether or not the quality of the thin sheet stamped parts is good based on the map.

In order to judge the quality of a pressed product that requires high-precision processing (for example, high-precision molding), a manual sampling inspection may be performed. However, it is difficult to remove all defective products by sampling inspection. Also, 100% inspection is virtually impossible in terms of cost and time. It is possible to remove other defective products contained in the lot by disposing of the entire lot containing the defective products found by the sampling inspection. However, the waste loss increases.

According to this embodiment, the control device 8 determines whether or not the processed product satisfies the required quality based on the measured value and the map of the sensor 3. Therefore, advanced determination is possible. Further, the burden of manual sampling inspection can be reduced. Since it is possible to dispose of only processed products that do not meet the required quality, it is possible to reduce disposal loss.

§2 Configuration example The configuration shown in FIG. 1 will be described in more detail. The press working system 100 can include a touch panel 9 and a relay unit 10. The touch panel 9 can show the measured value of the sensor in a graph format, for example. As a result, the tendency of the measured value (data) of the sensor can be managed, which is advantageous for quality control. The touch panel 9 can accept user input for various settings of the press working system 100.

The relay unit 10 outputs a signal for stopping the press machine 1 in response to a command from the control device 8. For example, when the measured value of the sensor exceeds a certain threshold value, the control device 8 sends a command to the relay unit 10. As a result, the relay unit 10 transmits a stop signal to the press machine 1.

Further, the control device 8 has a memory card 11 with a feature amount of data of each sensor for each shot (denoted as “**. **” in FIG. 1) and a time (denoted as “hh: mm: ss” in FIG. 1). Data can be stored.

FIG. 2 is a schematic view illustrating the arrangement of the sensors in the mold. With reference to FIG. 2, the die 2 is composed of a punch 21 and a die 22. The thin plate (not shown) is pressed by the relative linear movement of the punch 21 and the die 22.

A sensor 3A (first sensor) for detecting the punch load is arranged on the punch 21. A sensor 3B (second sensor) for detecting the die load is arranged on the die 22. The number of sensors placed on each of the punch and die, and the position of the sensors placed, are not limited as shown in FIG.

FIG. 3 is a block diagram showing a configuration example of the control device 8. With reference to FIG. 3, the control device 8 includes an input unit 31, a control unit 32, a storage unit 33, and an output unit 34. The input unit 31 receives various data. The control unit 32 executes various processes based on the data input to the input unit 31. The result of the processing by the control unit 32 is output to the outside of the control device 8 via the output unit 34.

The storage unit 33 stores the map 35. Map 35 associates punch and die load combinations with stamping characteristics. The storage unit 33 may store the control program executed by the control unit 32.

The control unit 32 realizes a determination unit that determines the quality of the thin sheet stamped parts. The control unit 32 determines the quality of the stamped thin plate part based on the punch load measured by the sensor 3A, the die load measured by the sensor 3B, and the map.

FIG. 4 is a diagram showing an example of a map. With reference to FIG. 4, in the map, the combination of the punch load and the die load and the characteristic (machining quality) are associated with each other. This map is prepared in advance by trial production of stamped thin plate parts. Note that FIG. 4 typically shows the correspondence between the combination of the punch load and the die load and the characteristics in a part of the map.

As illustrated in FIG. 4, there is no regularity in the combination of punch load and die load that gives good characteristics. Therefore, when the quality of the thin sheet stamped part is judged only by the value of the punch load or the die load, the accuracy of the judgment may decrease. In the present embodiment, the control device 8 can determine the quality of the thin sheet stamped parts from the load value measured by the sensor by referring to the map, so that more accurate determination becomes possible. The map is not limited to one type. The control device 8 may store a plurality of maps set for each press machine and determine the quality of the thin sheet pressed parts by referring to the maps associated with each press machine.

Next, acquisition of the load value will be described. Due to the relative linear movement (vertical movement) of the punch 21 and the die 22, the press 1 has a mechanism for vertical movement. The mechanism for vertical movement is, for example, a crank mechanism. Generally, the bottom dead center is detected by detecting the angle of the crank mechanism, and the load value at the detected bottom dead center is acquired. On the other hand, in the present embodiment, the bottom dead center load value can be acquired while not requiring the detection of the bottom dead center.

FIG. 5 is a diagram showing an example of acquiring a load value from a sensor signal. In the following description, the notation "sensor 3" used may be either sensor 3A or sensor 3B, or may correspond to both sensor 3A and sensor 3B.

As shown in FIG. 5, a load value threshold value that triggers load value detection is set. When the load value measured by the sensor 3 reaches the set threshold value, the load value measurement trigger is generated. The load value after a predetermined time (0.2 ms in the example shown in FIG. 5) from the occurrence of the trigger is acquired as the load value at the bottom dead center. The predetermined time can be set in advance by the operation of the press machine. Therefore, it is possible to eliminate the need for the output of the crank angle from the press machine. In this way, the bottom dead center load value can be acquired only by the signal from the sensor 3 without directly detecting the operation of the press machine 1.

In addition, there is a possibility that the position of the stroke after a predetermined time from the trigger generation does not match the bottom dead center. Therefore, it is preferable to sample the load value within a predetermined period after the lapse of a predetermined time from the occurrence of the trigger at regular intervals. The bottom dead center load value may be obtained by calculating a plurality of average values obtained by such a method. As a result, a more accurate bottom dead center load value can be obtained.

FIG. 6 is a diagram showing a flow of a quality determination method. The process shown in FIG. 6 is executed for each shot by, for example, the control device 8. When the process is started, in step S1, the control device 8 acquires the load values (punch load and die load) measured by the sensor 3. In step S2, the control device 8 refers to the map.

In step S3, the control device 8 determines the characteristics. If the characteristic is acceptable (“OK”), in step S4, the control device 8 determines that the processed product is a good product. On the other hand, if the characteristic is unacceptable (“NG”), in step S5, the control device 8 determines that the processed product is a defective product. When the process of step S4 or step S5 is completed, the entire process is returned to the beginning.

[Action / Effect]
According to this embodiment, the load data output during press working can be monitored in real time based on the pass / fail judgment map based on the combination of the punch load and the die load set in advance. Thereby, it is possible to highly judge the press working quality.

Further, according to the present embodiment, it is possible to reduce the burden of manual sampling inspection. Further, since it is possible to dispose of only processed products that do not meet the required quality in the lot, it is possible to reduce the disposal loss.

[Additional Notes]
As described above, the present embodiment includes the disclosures listed below.

1. 1. The punch load and die load when the thin plate is pressed by the relative linear movement of the punch (21) and the die (22) are measured by the first sensor (3A) provided on the punch (21) and the die (1). The step (S1) of measuring by the second sensor (3B) provided in 22) and
Based on the map (35) that associates the combination of the punch load and the die load with the characteristics of the press working, the quality of the thin plate drawn part is determined from the measured punch load and the die load. A method for determining the quality of a thin plate stamped part, which comprises steps (S2, S3, S4, S5).

2. 2. The measuring step is for at least one of the punch load and the die load.
A step of generating a trigger for measuring the load value when the load value reaches a preset threshold value, and
1. Including a step of acquiring the load value as a bottom dead center load value after a predetermined time has elapsed from the activation of the trigger. The quality determination method for stamped steel sheet parts described in.

3. 3. The step of acquiring the load value is
The step of sampling the load value within a predetermined period and
2. Including a step of averaging a plurality of values obtained by the sampling to obtain the load value. The quality determination method for stamped steel sheet parts described in.

4. A first sensor (3A) provided on the punch (21) to measure the punch load, and
A second sensor (3B) provided on the die (22) to measure the die load, and
A storage unit (33) that stores a map (35) that associates the combination of the punch load and the die load with the characteristics of the press working.
The quality of the stamped part is determined based on the punch load measured by the first sensor (3A), the die load measured by the second sensor (3B), and the map (35). A quality determination device for stamped thin plate parts, which comprises a determination unit (32).

5. Above 4. The quality judgment device for thin sheet stamped parts described in
A press working system comprising the punch (21) and a press (1) having the die (22).

The embodiments disclosed this time should be considered as exemplary in all respects and not restrictive. The scope of the present invention is shown by the scope of claims rather than the above description, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

1 Press machine, 2 Die, 3, 3A, 3B sensor, 5 Signal conditioner, 6 High-speed analog input unit, 7 I / O power supply addition unit, 8 Control device, 9 Touch panel, 10 Relay unit, 11 Memory card, 21 Punch, 22 dies, 31 input units, 32 control units, 33 storage units, 34 output units, 35 maps, 100 press working systems, S1, S2, S3, S4, S5 steps.

Claims (5)

A step of measuring a punch load and a die load when a thin plate is pressed by relative straight movement of a punch and a die by a first sensor provided on the punch and a second sensor provided on the die. ,
A step of determining the quality of the thin plate drawn part from the measured punch load and die load based on a map associating the combination of the punch load and the die load with the characteristics of the press working. A method for determining the quality of stamped thin plate parts. The measuring step is for at least one of the punch load and the die load.
A step of generating a trigger for measuring the load value when the load value reaches a preset threshold value, and
The quality determination method for a thin sheet stamped part according to claim 1, further comprising a step of acquiring the load value as a bottom dead center load value after a predetermined time has elapsed from the activation of the trigger. The step of acquiring the load value is
The step of sampling the load value within a predetermined period and
The quality determination method for a thin sheet stamped part according to claim 2, further comprising a step of averaging a plurality of values obtained by the sampling to obtain the load value. A first sensor provided on the punch to measure the punch load,
A second sensor installed on the die to measure the die load,
A storage unit that stores a map that associates the combination of the punch load and the die load with the characteristics of the press working.
A thin plate press including the punch load measured by the first sensor, the die load measured by the second sensor, and a determination unit for determining the quality of the thin plate stamped part based on the map. Quality judgment device for machined parts. The quality determination device for stamped thin sheet parts according to claim 4,
A stamping system comprising the punch and a press with the die.

Images