JP2015000412A - Residue-rise detection device and residue-rise detection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a residue-rise detection device and a residue-rise detection method, capable of accurately detecting a residue-rise regardless of a construction material and a size of a residue.SOLUTION: The residue-rise detection device for detecting the residue-rise generated when press-working a processing object material 4 by a punch 7, comprises displacement measuring means 9 for measuring displacement of a stripper 6 for pressing down the processing object material 4, bottom detection means 13 for detecting a bottom value (c) of a first bound when the stripper 6 collides with the processing object material 4 based on the displacement of the stripper 6 measured by the displacement measuring means 9, peak detection means 15 for detecting a peak value of the first bound based on the displacement of the stripper 6 measured by the displacement measuring means 9 and determining means 18 for determining the existence of the residue-rise by comparing a calculation value determined based on the peak value or the bottom value and the peak value with a predetermined set value.

Description

  The present invention relates to a residue rise detection device and a residue rise detection method for detecting residue rise occurring in press working.

  Conventionally, when manufacturing a press product by pressing a work material using a press device provided with a stripper, the residue when the work material is punched is formed on the work material or on the work material and the lower mold. There may be a phenomenon of so-called dregs that gets in between. If such a residue rises, there is a risk of adverse effects such as adhesion of the residue to the pressed product or damage to the pressed product by the residue. It is required to detect well.

  FIG. 1 shows the structure of a general press apparatus 1, 2 is an upper die, 3 is a lower die, 4 is a material to be processed, 5 is a spring, 6 is a lower surface of the upper die 2 via a spring 5. It is a connected stripper. In this press apparatus 1, the work material 4 on the lower die 3 is first pushed by the stripper 6, and then the work die 4 is punched by the punch 7 attached to the upper die 2 when the upper die 2 is lowered. It is configured as follows.

  Conventionally, as a method for detecting the residue rise in such a press apparatus 1, a displacement sensor 9 for detecting the displacement of the target 8 attached to the stripper 6 being pressed is provided in the lower die 3, and this displacement is detected. The sensor 9 is used to detect the bottom dead center of the first bounce when the stripper 6 collides with the workpiece 4 and compares the bottom dead center position with a predetermined set value to detect an uplift. (For example, refer to Patent Document 1). In Patent Document 1, when the scrap rises, the bottom dead center position of the first bound when the stripper collides with the workpiece is changed from the set position (bottom dead center position during normal punching). By utilizing this change, it is determined that a dregling has occurred by comparison with the normal state.

  In addition, as a method of detecting the residue rise, the stripper displacement speed (displacement gradient) before and after the stripper collides with the work material is calculated. If residue rise occurs, the velocity immediately before the bottom dead center position is calculated. It is disclosed that, when this speed is out of the set range by using the decrease, it is determined that a dregling has occurred (for example, see Patent Document 2).

  In addition, when the stripper bottoms out, a waste rise detection period is provided to detect before the waste is crushed, and the occurrence of waste rise occurs when the closest position of the stripper to the sensor is different from the preset position during that period. What is detected is disclosed (for example, refer to Patent Document 3).

Japanese Patent No. 1585370 Japanese Patent No. 2817831 Japanese Patent No. 3373414

  However, in the conventional method for detecting the residue rise, depending on the material of the soft material or the size of the residue, a clear difference between the normal state and the occurrence of residue rise cannot be obtained, and there is a possibility that the residue rise cannot be detected. It was.

  The present invention has been made in view of the above-described problems, and provides a dregs rise detection apparatus and dregs rise detection method that can accurately detect dregs rise regardless of the material and size of the dregs. The purpose is to do.

  In order to achieve the above object, a dregs rise detection device according to the present invention is a dregs rise detection device for detecting dregs rise that occurs when a work material is pressed by a punch. A displacement measuring means for measuring the displacement of the stripper that holds the workpiece, and a bottom value of the first bounce when the stripper collides with the workpiece based on the displacement of the stripper measured by the displacement measuring means. A bottom detection unit; a peak detection unit for detecting a peak value of an initial bounce when the stripper collides with the workpiece material based on the displacement of the stripper measured by the displacement measurement unit; and the peak value Or, the calculated value obtained based on the bottom value and the peak value is compared with a predetermined set value to Is characterized by comprising determination means for determining whether the.

  In addition, the residue detection device according to the present invention is characterized in that the determination means determines the presence or absence of residue increase by using the bounce amount that is the difference between the peak value and the bottom value as the calculated value.

  Further, the residue detection device according to the present invention is characterized in that the determination means determines the presence or absence of residue increase using the peak value as the calculated value.

  Further, the residue detection device according to the present invention is characterized in that the determination means determines the presence or absence of residue increase using the elapsed time from the bottom value to the peak value as the calculated value.

  In addition, the dregs detection apparatus according to the present invention is characterized in that the predetermined set value is set based on the calculated value obtained in the past press working.

  A residue rise detection method according to the present invention is a residue rise detection method for detecting residue rise that occurs when a workpiece is pressed by a punch, and measures a displacement of a stripper that presses the workpiece. A bottom detection step of detecting a bottom value of the first bounce when the stripper collides with the workpiece; and a displacement of the stripper that holds the workpiece material is measured, and the stripper collides with the workpiece. The peak detection step for detecting the peak value of the first bounce at the time, the peak value or the calculated value obtained based on the bottom value and the peak value and a predetermined set value are compared, And a dregs rising determination step for determining presence or absence.

  According to the residue rise detection apparatus and residue rise detection method according to the present invention, the bottom value and the peak value of the first bounce when the stripper collides with the workpiece material are detected, and the peak value or the bottom value and the peak value are detected. Since the calculated value obtained based on the value is compared with a predetermined set value to determine whether or not the residue has risen, the residue is soft and the residue has been crushed when the stripper collides with the material being processed. Even if the bottom value (bottom dead center) of the first bounce at the time of the collision between the stripper and the material to be processed does not show a clear difference from the normal bottom value because the residue is small, the residue rises. If the stripper collides with the work material, the first bounce peak value or the bounce amount changes, and the debris is not affected by the debris material or size. Up The Rino presence can be determined accurately.

  Further, according to the dregs detection device according to the present invention, a bounce amount that is a difference between the peak value and the bottom value is calculated, and the bounce amount is compared with a predetermined set value to determine whether or not dregs rise. Therefore, when a residue rise occurs, the presence or absence of residue rise can be accurately determined using the change in the bound amount.

  Further, according to the residue rise detection device according to the present invention, the peak value is used as a calculated value, and the presence of the residue rise is determined by comparing the peak value with a predetermined set value. Therefore, by using only the change of the peak value, it is possible to accurately determine the presence or absence of dregs while simplifying the processing.

  Further, according to the residue detection device according to the present invention, the elapsed time from the bottom value to the peak value is calculated, and this elapsed time is compared with a predetermined set value to determine the presence or absence of residue increase. Therefore, when a dregs rise occurs, it is possible to accurately determine whether or not dregs rise using the change in elapsed time.

  Further, according to the dregs detection device according to the present invention, the predetermined set value is set based on the calculated value obtained in the past press working, so that the change in the characteristics of the press device and the displacement of the stripper It is possible to accurately determine the presence / absence of dregs while taking into consideration the influence of the change in the characteristics of the displacement measuring means for measuring.

It is a schematic sectional drawing which shows an example of a structure of a press apparatus. It is a block diagram which shows an example of a structure of the dregs rise detection apparatus which concerns on embodiment of this invention. It is a graph which shows an example of the stripper displacement at the time of normal and the dregs rise (no crushing). It is a graph which shows an example of the stripper displacement at the time of normal and the dregs rise (with crushing). It is a flowchart which shows an example of the flow of the process by the microcomputer of the dregs detection apparatus which concerns on the 1st Embodiment of this invention. It is a flowchart which shows an example of the flow of a process by the microcomputer of the dregs detection apparatus which concerns on the 2nd Embodiment of this invention. It is a flowchart which shows an example of the flow of a process by the microcomputer of the dregs rise detection apparatus which concerns on the 3rd Embodiment of this invention.

  Hereinafter, an embodiment of a dregs detection device according to the present invention will be described with reference to the drawings. The residue rise detection apparatus according to the first embodiment of the present invention is for detecting residue rise that occurs during press working using the press device 1. As shown in FIG. 1, in the pressing device 1, a stripper 6 is attached to the lower surface of the upper die 2 via a spring 5, and the stripper 6 is lowered together with the upper die 2 and between the lower die 3. The work material 4 is sandwiched and pressed. Then, when the upper die 2 is further lowered, the workpiece 4 is punched out by the punch 7 attached to the upper die 2. The residue 10 due to this punching falls into a residue hole 11 formed in the lower mold 3. However, after the punching, the residue 10 may stick between the workpiece 4 and the stripper 6 due to adhesion of the residue 10 to the tip of the punch 7 or the like.

  In order to detect such a residue rise, the residue rise detection device includes a displacement sensor 9 attached to the lower mold 3 for detecting the displacement of the stripper 6, and a displacement sensor 9 as shown in FIGS. Based on the displacement timing signal detection circuit 12 for detecting that the output of the stripper 6 starts to change and the displacement of the stripper 6 measured by the displacement sensor 9, the first bounce when the stripper 6 collides with the workpiece 4 is detected. A first bound bottom detection circuit 13 for obtaining a bottom value (bottom dead center), a bottom hold unit 14 for holding the bottom value, a first bound peak detection circuit 15 for obtaining a peak value (top dead center) of the first bound, A peak hold unit 16 for holding the peak value, an A / D converter 17 for converting the signal into a digital value, and a difference (bound amount) between the peak value and the bottom value. By comparing the set value, and a microcomputer 18 or the like having a function such as a determination means for determining presence or absence of chip-up. In this embodiment, the displacement sensor 9 is provided so as to measure the distance “a” from the target 8 attached to the stripper 6, but may be provided so as to directly measure the distance from the stripper 6. .

  3 and 4 are graphs showing the displacement of the stripper 6 measured by the displacement sensor 9. In the press device 1, bounce occurs when the stripper 6 collides with the workpiece 4. FIG. 3 shows the displacement of the stripper 6 in a normal state where no residue rise is indicated by a solid line, and the stripper 6 when the residue is raised when the residue 10 is not crushed when the stripper 6 and the workpiece 4 collide with a broken line. The displacement is shown. In addition, c and d in FIG. 3 indicate the bottom value and peak value of the first bounce when normal, respectively, and c1 and d1 indicate the bottom value of the first bounce when dregs rise (no crushing), respectively. And the peak value is shown. As shown in FIG. 3, when the residue 10 is not crushed, the initial bounce amount e1 = d1-c1 when the stripper 6 collides with the workpiece 4 is equal to the normal bounce amount e = dc. (E1> e).

  In FIG. 4, the displacement of the stripper 6 in a normal state in which the residue does not rise is shown by a solid line. The displacement is shown. Further, c and d in FIG. 4 indicate the bottom value and peak value of the first bounce when normal, respectively, and c2 and d2 are the bottom values of the first bounce when dregs rise (with crushing), respectively. And the peak value is shown. As shown in FIG. 4, when the residue 10 is crushed, the stripper 6 and the work material 4 are not elastically collided, so the bound amount e2 = d2-c2 is equal to the normal bound amount e = dc. (E2 <e). That is, when the residue rises, as shown in FIGS. 3 and 4, the peak value and the bounce amount that is the difference between the peak value and the bottom value change compared to the normal time. For this reason, the residue detection device of the present invention uses this change to detect the presence or absence of residue increase.

  Hereinafter, the processing operation performed by the dregs detection apparatus according to the present embodiment will be described. First, the displacement sensor 9 outputs a displacement signal 21 corresponding to the raising and lowering of the stripper 6, as shown in FIG. When the displacement signal 21 reaches g shown in FIGS. 3 and 4, the displacement timing signal detection circuit 12 outputs the displacement timing signal 22 and continues until g ′, which is the same displacement as g. Note that g indicates a point serving as a reference for outputting the displacement timing signal 22, and g ′ indicates a point serving as a reference for ending the output of the displacement timing signal 22, and these values are particularly limited. However, it is appropriately set according to the characteristics of the displacement sensor 9 and the like.

  The first bound bottom detection circuit 13 monitors the displacement signal 21 after the displacement timing signal 22 is input, detects the first bound bottom value (bottom dead point), which is the point where the stripper 6 stops descending, The first bound bottom detection signal 23 is output. And the bottom hold part 14 will hold | maintain the bottom value of the displacement signal 21, if the 1st bound bottom detection signal 23 is input. This bottom value is output as a bottom hold signal 24.

  The first bounded peak detection circuit 15 monitors the displacement signal 21 after the first bounded bottom detection signal 23 is input, and obtains a peak value (top dead center) that is the point at which the first bound of the stripper 6 stops rising. The first bound peak detection signal 25 is output. Then, when the first bound peak detection signal 25 is input, the peak hold unit 16 holds the peak value of the displacement signal 21. This peak value is output as a peak hold signal 26.

  The A / D converter 17 converts the bottom hold signal 24 and the peak hold signal 26 into digital values and outputs the displacement digital signal 27 to the microcomputer 18 when the displacement timing signal 22 is no longer output (g ′). To do. The microcomputer 18 calculates the bounce amount from the input bottom value and peak value, determines whether or not the value is within a predetermined set value range, and if it deviates, determines that the residue has risen. Then, a stop signal 28 for stopping the press device 1 is output, the press device 1 is stopped, and the operator is notified by an alarm that the residue is raised.

  In the following, a process for detecting an increase in residue in the microcomputer 18 will be described with reference to the flowchart of FIG. In S <b> 101, the microcomputer 18 first sets a reference value h as a reference for the range of set values to be compared, and then reads the bottom value c and the peak value d from the displacement digital signal 27, and the peak value d and the bottom value are read. A bound amount e which is a difference of c is calculated (S102).

  Next, it is determined whether or not the bound amount e calculated in S102 is larger than the upper limit of the set value range (S103). Here, the upper limit of the set value of the bound amount is obtained by multiplying the reference value h by a predetermined coefficient p (for example, p = 2.0). The predetermined coefficient p is a coefficient for determining the upper limit of the set value, and is appropriately set according to the press working conditions and the like.

  Then, if it is determined that the bound amount e is larger than the upper limit of the set value (S103: YES), it is determined that a residue rise has occurred, and a stop signal 28 is output to the press device 1 (S106). If it is determined that the bound amount e is less than or equal to the upper limit of the set value (S103: NO), it is next determined whether or not the bound amount e is smaller than the lower limit of the set value range (S104). . Here, a value obtained by multiplying the reference value h by a predetermined coefficient q (for example, q = 0.5) is set as the lower limit of the set value of the bound amount. This predetermined coefficient q is a coefficient for determining the lower limit of the set value, and is appropriately set according to the press working conditions and the like, similarly to the coefficient p.

  If it is determined that the bounce amount e is smaller than the lower limit of the set value (S104: YES), it is determined that a residue rise has occurred, and a stop signal 28 is output to the press device 1 (S106). If it is determined that the bounce amount e is equal to or greater than the lower limit of the set value (S104: NO), the microcomputer 18 determines that no dregling has occurred and uses the bounce amount e calculated in S102. Substituting into the reference value h (S105), the process from S102 is repeated in order to determine whether or not there is residue rise in the next press working. Here, the range of the set value is updated by substituting the bounce amount e calculated in S102 for the reference value h in the process of S105 and using it as the reference value in the next press working. Alternatively, the set value range may be determined in advance in S101, and the set value range may be used for the determination in S103 and S104. In that case, the process of S105 is omitted. Also, the bound amount e for the past several times calculated in S102 may be stored, and the set value range may be determined from the average value or standard deviation. Thereby, it is possible to accurately determine whether or not the residue has risen while taking into consideration the influence of the change in the characteristics of the press device 1 and the change in the characteristics of the displacement sensor 9.

  Next, a process for detecting a residue rise in the microcomputer 18 of the residue rise detection apparatus according to the second embodiment of the present invention will be described with reference to the flowchart of FIG. The residue rise detection device according to the second embodiment has basically the same configuration as the residue rise detection device according to the first embodiment, and uses a peak value d instead of the bounce amount e to determine whether or not the residue rises. It is used for judgment.

  In the microcomputer 18 of the dregs detection apparatus according to the second embodiment, first, in S201, a reference value i serving as a reference of the set value range to be compared is set, and then the peak value d is obtained from the displacement digital signal 27. It is determined whether or not the peak value d is larger than the upper limit of the set value range (S202). Here, the upper limit of the set value of the peak value is obtained by multiplying the reference value i by a predetermined coefficient p1. The predetermined coefficient p1 is a coefficient for determining the upper limit of the set value in the same manner as the coefficient p, and is appropriately set according to the press working conditions and the like.

  Then, if it is determined that the peak value d is larger than the upper limit of the set value (S202: YES), it is determined that the residue has risen, and the stop signal 28 is output to the press device 1 (S205). If it is determined that the peak value d is less than or equal to the upper limit of the set value (S202: NO), it is next determined whether or not the peak value d is smaller than the lower limit of the set value range (S203). . Here, the reference value i multiplied by a predetermined coefficient q1 is used as the lower limit of the set value of the peak value. This predetermined coefficient q1 is a coefficient for determining the lower limit of the set value in the same manner as the coefficient q, and is appropriately set according to the press working conditions and the like.

  If it is determined that the peak value d is smaller than the lower limit of the set value (S203: YES), it is determined that a residue rise has occurred, and a stop signal 28 is output to the press device 1 (S205). If it is determined that the peak value d is equal to or greater than the lower limit of the set value (S203: NO), the microcomputer 18 determines that no residue increase has occurred, and substitutes the peak value d for the reference value i. In step S204, the process from step S202 is repeated in order to determine whether or not there is residue rise in the next press working. Note that, in the dregs detection apparatus according to the second embodiment, similarly to the dregs detection apparatus according to the first embodiment, the range of the set value is determined in advance in S201, and the range of the set value is determined in S202. And S203 may be used. Alternatively, the past several peak values d inputted to the microcomputer 18 may be stored, and the set value range may be determined from the average value or standard deviation.

  Next, a process for detecting a residue rise in the microcomputer 18 of the residue rise detection apparatus according to the third embodiment of the present invention will be described with reference to the flowchart of FIG. The residue increase detection apparatus according to the third embodiment increases the elapsed time Δt from the bottom value c to the peak value d instead of the bounce amount e used in the residue increase detection apparatus of the first embodiment. It is used to determine the presence or absence of Therefore, in the dregs detection device according to the third embodiment, the microcomputer 18 has a bottom value c from a point g indicating a predetermined displacement that serves as a reference for the displacement timing signal detection circuit 12 to output the displacement timing signal 22. The elapsed time t1 until reaching the peak value d and the elapsed time t2 until reaching the peak value d are input.

  In the microcomputer 18 of the dregs detection apparatus according to the third embodiment, first, in S301, after a reference value j serving as a reference for the range of setting values to be compared is set, a digital signal is output from the A / D converter 18. The elapsed time t1 until reaching the bottom value c and the elapsed time t2 until reaching the peak value d are read, and the elapsed time Δt = t2-t1 from the bottom value c to the peak value d is calculated ( S302).

  Next, it is determined whether or not the elapsed time Δt calculated in S302 is larger than the upper limit of the set value range (S303). Here, the upper limit of the set value of the elapsed time is obtained by multiplying the reference value j by a predetermined coefficient p2. The predetermined coefficient p2 is a coefficient for determining the upper limit of the set value in the same manner as the coefficient p, and is appropriately set according to the press working conditions and the like.

  If it is determined that the elapsed time Δt is greater than the upper limit of the set value (S303: YES), it is determined that a dregs rise has occurred, and a stop signal 28 is output to the press device 1 (S306). If it is determined that the elapsed time Δt is less than or equal to the upper limit of the set value (S303: NO), it is next determined whether or not the elapsed time Δt is smaller than the lower limit of the set value range (S304). . Here, the reference value j multiplied by a predetermined coefficient q2 is used as the lower limit of the set value of elapsed time. This predetermined coefficient q2 is a coefficient for determining the lower limit of the set value in the same manner as the coefficient q, and is appropriately set according to the press working conditions and the like.

  If it is determined that the elapsed time Δt is smaller than the lower limit of the set value (S304: YES), it is determined that a residue rise has occurred, and a stop signal 28 is output to the press device 1 (S306). If it is determined that the elapsed time Δt is equal to or greater than the lower limit of the set value (S304: NO), the microcomputer 18 determines that no dregling has occurred and substitutes the elapsed time Δt for the reference value j. In step S354, the process from step S302 is repeated in order to determine whether or not there is residue rise in the next press work. Note that, in the dregs detection device according to the third embodiment, similarly to the dregs detection device according to the first embodiment, the range of the set value is determined in advance in S301, and the range of the set value is determined in S303. And S304 may be used. Alternatively, the past time Δt input to the microcomputer 18 may be stored, and the set value range may be determined from the average value or standard deviation. In step S302, an elapsed time t1 from the point g to the bottom value c and an elapsed time t2 from the bottom value c to the peak value d are calculated from the elapsed time t1 until the peak value d is reached. Instead, a time (elapsed time Δt) from when the bottom value c is detected by the first bound bottom detection circuit 13 until the peak value d is detected by the first bound peak detection circuit 15 is detected. It may be input to the computer 18.

  In this embodiment, an example in which one displacement sensor 9 is provided is shown, but a plurality of displacement sensors 9 may be provided. Further, in the case where no residue rise is detected by the conventional residue rise detection method, the residue rise is detected by the processing in the residue rise detection apparatus according to the first to third embodiments of the present invention. Of course, it is possible to combine it with the residue detection method.

  The embodiment of the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the scope of the idea of the present invention.

4 Work material 6 Stripper 7 Punch 9 Displacement sensor (displacement measuring means)
12 displacement timing signal detection circuit 13 first bound bottom detection circuit (bottom detection means)
14 Bottom hold part 15 1st bound peak detection circuit (peak detection means)
16 Peak hold unit 17 A / D converter 18 Microcomputer c to c2 Bottom value d to d2 Peak value e to e2 Bound amount

Claims (6)

A residue detection device for detecting residue increase that occurs when a workpiece is pressed by a punch,
A displacement measuring means for measuring a displacement of a stripper for pressing the work material;
Bottom detection means for detecting the bottom value of the first bounce when the stripper collides with the workpiece material, based on the displacement of the stripper measured by the displacement measurement means;
Based on the displacement of the stripper measured by the displacement measuring means, peak detecting means for detecting a peak value of the first bounce when the stripper collides with the work material;
A cascading device comprising: a determining unit that compares the peak value or a calculated value obtained based on the bottom value and the peak value with a predetermined set value to determine whether or not there is an increase in scum. Rising detection device.   2. The dregs rise detection device according to claim 1, wherein the determination unit determines whether or not dregs rise by using a bounce amount that is a difference between the peak value and the bottom value as the calculated value.   2. The residue rise detection apparatus according to claim 1, wherein the determination unit determines presence / absence of residue increase using the peak value as the calculated value.   2. The dregs rise detection apparatus according to claim 1, wherein the determination unit determines whether or not dregs have risen by using an elapsed time from the bottom value to the peak value as the calculated value.   The dregs detection device according to any one of claims 1 to 4, wherein the predetermined set value is set based on the calculated value obtained in the past press working. A scrap detection method for detecting scrap increase that occurs when a workpiece is pressed by a punch,
Measuring a displacement of a stripper for pressing the workpiece material, and detecting a bottom value of a first bounce when the stripper collides with the workpiece;
Measuring a displacement of a stripper that holds the workpiece material, and detecting a peak value of an initial bounce when the stripper collides with the workpiece;
A residue increase determination step of comparing the peak value or a calculated value obtained based on the bottom value and the peak value and a predetermined set value to determine whether or not residue increase is present, How to detect dregs.

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