Determining device, determining method, and press working device

Abstract

Provided is a determination device, a determination method, and a press working device. The determination device of the present disclosure is a determination device that determines whether or not the size of a gap between a side surface of a punch and an inner wall of a hollow portion of a stripper of a press mold is appropriate, the press mold having the punch, the stripper having the hollow portion into which the punch is inserted, and a die, and includes a control portion that determines whether or not the gap is appropriate based on a detection value of a load sensor when a load is applied to the punch, the control portion determining that the gap is not appropriate when the detection value of the load sensor exceeds a predetermined threshold value.

Description

Technical Field

[0001] This disclosure relates to a determination device, a determination method, and a stamping processing device. Background Technology

[0002] For example, Patent Document 1 discloses a stamping die manufactured by overlapping at least two die components that are in a fitting relationship with the punch in the die component and simultaneously performing hole processing on the mounting table of a hole processing machine.

[0003] Existing technical documents Patent documents Patent Document 1: Japanese Patent Application Publication No. 5-115929 Summary of the Invention

[0004] One aspect of the present disclosure is a determination device for determining whether the size of the gap between the side of the punch and the inner wall of the hollow portion of the demolding machine is appropriate in a stamping die having a punch, a demolding machine having a hollow portion for inserting the punch, and a die. The device comprises: a load sensor for detecting a load applied to the punch; and a control unit for determining whether the gap is appropriate based on the detection value of the load sensor, wherein the control unit determines that the gap is inappropriate if the detection value of the load sensor exceeds a predetermined threshold.

[0005] One aspect of the present disclosure is a method for determining whether the size of the gap between the side of the punch and the inner wall of the hollow portion of the demolding machine is appropriate in a stamping die having a punch, a demolding machine having a hollow portion for inserting the punch, and a die. The method includes: a step of detecting a load applied to the punch; and a step of determining whether the gap is appropriate based on the detected load. The step of determining whether the gap is appropriate includes: if the detected load exceeds a predetermined threshold, determining that the gap is inappropriate.

[0006] One aspect of the stamping apparatus disclosed herein includes a demolding machine having a hollow portion for insertion of the punch, a die, and the aforementioned determining device. Attached Figure Description

[0007] Figure 1 This is a block diagram that schematically illustrates the determination device of Embodiment 1.

[0008] Figure 2 It is used to explain its use. Figure 1 A schematic diagram of a determination device for judging whether the clearance in the stamping die is appropriate.

[0009] Figure 3 It is used to illustrate the use of Figure 1A schematic diagram of a determination device for judging whether the clearance in the stamping die is appropriate.

[0010] Figure 4 It is used to illustrate the use of Figure 1 A schematic diagram of a determination device for judging whether the clearance in the stamping die is appropriate.

[0011] Figure 5A This is a brief explanation of... Figure 2 A diagram showing the movement of the punch, demolding machine, and die in a stamping mold.

[0012] Figure 5B This is a brief explanation of... Figure 2 A diagram showing the movement of the punch, demolding machine, and die in a stamping mold.

[0013] Figure 5C Is Figure 2 A diagram that roughly illustrates the operation of the punch, ejector, and die in a stamping die.

[0014] Figure 5D This is a brief explanation of... Figure 2 A diagram showing the movement of the punch, demolding machine, and die in a stamping mold.

[0015] Figure 5E Is Figure 2 A diagram that roughly illustrates the operation of the punch, ejector, and die in a stamping die.

[0016] Figure 5F Is Figure 2 A diagram that roughly illustrates the operation of the punch, ejector, and die in a stamping die.

[0017] Figure 5G Is Figure 2 A diagram that roughly illustrates the operation of the punch, ejector, and die in a stamping die.

[0018] Figure 6 It is a schematic diagram used to illustrate the gap between the punch and the demolding machine.

[0019] Figure 7 This is a flowchart illustrating the determination process for whether the gap of the determination device is appropriate.

[0020] Figure 8 It is a graph showing the relationship between the load applied to the punch and time when the clearance between the punch and the demolding machine is appropriate.

[0021] Figure 9 It is a graph showing the relationship between the load applied to the punch and time when the clearance between the punch and the demolding machine is inappropriate.

[0022] Figure 10This is a diagram that schematically illustrates the load sensor included in the determination device of Modification 1 of Embodiment 1.

[0023] Figure 11 This is a diagram that schematically illustrates the stamping apparatus of Embodiment 2.

[0024] Figure 12 It means by Figure 11 A graph showing the relationship between the load applied to the punch and time obtained from a stamping processing device.

[0025] Figure 13 It means by Figure 11 A graph showing the relationship between the load applied to the punch and time obtained from a stamping processing device.

[0026] Symbol Explanation 1. Punch 1a Stamping surface 1b Side view 2. Stamping Die 2a Hollow section 3 Demolding machine 3a Hollow section 4. Remove template 5 Templates 6. 60 Load Sensor 7. Demolding bolts 8 Demolding guide pins 9. Demolding guide 10 Demolding guide 11 Position Sensors 12 Control Department 13 Sensor Controller 14. Arithmetic Unit 15 Judgment Department 16 Output Section 17. Stamping controller 18. Main body of the stamping device 19 servo motors 20 Slider 21. Pad 22. Objects to be processed 23 Springs 24 Screw Plug 25 Upper stop 26 Lower stop 27 Punch Plate 28 Back panel 29 Upper mold frame 30 Stamping Die Back Plate 31 Lower mold frame 32 pieces 100 Judgment Device 101 Upper mold 102 Lower mold 150 stamping die 200 stamping processing equipment Detailed Implementation

[0027] In the punch die described in Patent Document 1, there is room for improvement in determining whether the gap between the punch and the mold component with the fitting relationship is appropriate.

[0028] This disclosure provides a device, a method, and a stamping apparatus for determining whether the size of the gap between the side of the punch and the inner wall of the hollow part of the demolding machine is appropriate.

[0029] (The process of completing this disclosure) In stamping, a process that involves blanking sheet-like workpieces, the workpiece is typically placed on a die using a die-casting machine or die-casting plate, and a punch is used to cut a portion of the workpiece into a predetermined shape, thereby obtaining the desired shape. Blanking-based stamping is used in various fields, including home appliances, precision machinery, and automotive parts.

[0030] In the processing of small parts, the size of the punched hole is sometimes small, or the workpiece is thin. In such cases, the size of the punch tip also decreases depending on the size of the punched hole or the thickness of the workpiece. If the punch tip becomes smaller, the strength of the punch may also decrease. Therefore, in order to suppress punch breakage, it has been studied to guide the punch tip using a hollow portion provided in a demolding machine or demolding plate for punch insertion.

[0031] When using the hollow portion of a demolding machine or demolding plate to guide the front end of the punch, it is necessary to maintain an appropriate clearance between the inner wall of the hollow portion of the demolding machine or demolding plate and the side of the punch. An inappropriate clearance increases the sliding resistance during punch movement, and sometimes sintering occurs in the punch.

[0032] The inventors have studied a determination device and a determination method for determining whether a gap is appropriate, as well as a stamping processing apparatus equipped with the determination device, and have thus completed the following invention.

[0033] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. Furthermore, for ease of explanation, the elements are exaggerated in the drawings.

[0034] In this specification, terms such as "first" and "second" are used for illustrative purposes only and should not be construed as indicating, explicitly or implicitly, relative importance or the order of importance of a technical feature. A feature defined as "first" or "second" indicates, explicitly or implicitly, that one or more of that feature are included.

[0035] (Implementation Method 1) [Overall Structure] Figure 1 This is a block diagram that schematically illustrates the determination device 100 according to Embodiment 1. Figures 2-4 It is used for... Figure 1 This is a schematic diagram illustrating the determination of whether the clearance in the stamping die 150 of the determination device is appropriate. Furthermore, the XYZ coordinate system shown in the figure is for ease of understanding of the embodiment and is not intended to limit the embodiment. In each figure, the X direction represents the width direction of the stamping die 150, the Y direction represents the depth direction of the stamping die 150, and the Z direction represents the height direction of the stamping die 150.

[0036] <Judgment Device> The judging device 100 is used to determine whether the gap between the side 1b of the punch 1 in the stamping die 150 (described in detail later) and the inner wall of the hollow part 3a of the demolding machine 3 is appropriate.

[0037] like Figure 1 As shown, the determination device 100 includes a load sensor 6 and a control unit 12.

[0038] Load sensor 6 is a sensor that detects the load applied to punch 1. In this embodiment, as... Figures 2-4 As shown, the load sensor 6 is disposed on the surface of the punch 1 opposite to the stamping surface 1a. Furthermore, in this embodiment, a load sensor 6 is disposed on the punch 1. The load sensor 6 can be, for example, a piezoelectric force sensor or an electrical force sensor such as a strain gauge.

[0039] The control unit 12 determines whether the gap is appropriate based on the detection value of the load sensor 6. The control unit 12 is, for example, composed of digital circuits such as a microcomputer, CPU, MPU, GPU, DSP, FPGA, or ASIC. In this embodiment, as... Figures 2-4 As shown, the control unit 12 includes, for example, a sensor controller 13 for controlling the load sensor 6, an arithmetic unit 14, and a determination unit 15.

[0040] The sensor controller 13 is electrically connected to the load sensor 6 and outputs the detection value of the load sensor 6 to the calculation unit 14. The calculation unit 14 calculates the relationship between the load applied to the punch 1 and time based on the load detected by the load sensor 6. Details regarding the relationship between the load applied to the punch 1 and time will be described later. The determination unit 15 determines whether the gap between the punch 1 and the demolding machine 3 is appropriate.

[0041] <Stamping Dies> Reference Figures 2-4 The stamping die 150, which is the object of determination by the determination device 100, will be described.

[0042] like Figures 2-4 As shown, the stamping die 150 includes a punch 1, a demolding machine 3 with a hollow portion 3a for inserting the punch 1, and a die 2. In this embodiment, the stamping die 150 is composed of an upper die 101 containing the punch 1 and a lower die 102 containing the die 2. The stamping die 150 is mounted on a stamping processing apparatus (not shown) and is used to perform blanking processing on a workpiece (not shown) placed on the die 2.

[0043] The upper die 101 is equipped with a punch 1 and a load sensor 6. In addition, the upper die 101 is equipped with a punch plate 27, a back plate 28 and an upper die holder 29 for fixing the punch 1 and the load sensor 6.

[0044] The upper die 101 is also equipped with a demolding machine 3, a demolding plate 4, a demolding guide pin 8, a demolding guide liner 9, a demolding bolt 7, and an upper stop 25. The demolding plate 4 is a component that holds the demolding machine 3. The demolding guide pin 8 is a component that positions the demolding plate 4. The demolding guide liner 9 is a component that positions the demolding guide pin 8. The demolding bolt 7 is a component that holds the demolding plate 4 and allows the demolding machine 3 to move. The upper stop 25 is a component that restricts the movement of the punch 1 in the stamping direction (+Z direction). It should be noted that when the stamping die 150 is installed on the stamping processing device and the clearance between the punch 1 and the demolding machine 3 is determined to be appropriate, the movement of the punch 1 may not necessarily be restricted by the upper stop 25.

[0045] Punch 1 is a tool used to cut the workpiece by moving along the stamping direction (Z direction). For example... Figures 2-4 As shown, the punch 1 has a stamping surface 1a facing the workpiece and a side surface 1b connected to the stamping surface 1a.

[0046] In this embodiment, the stamping surface 1a of the punch 1 is formed into a cylindrical shape with a diameter of 4.5 mm.

[0047] The punch 1 is made of, for example, a superhard material. An example of a superhard material is an artificial metal (alloy) formed by combining at least one of the following nine carbides—W (tungsten), Cr (chromium), Mo (molybdenum), Ti (titanium), Zr (zirconium), Hf (hafnium), V (vanadium), Nb (niobium), and Ta (tantalum)—with a Fe group metal (e.g., Fe, Co, or Ni). As a superhard material constituting the punch 1, an alloy equivalent to VF-20 of the Superhard Tool Specifications Society (CIS) can be used, for example.

[0048] The demolding machine 3 is a tool used to press the workpiece placed on the die 2 under pressure when punching the workpiece using the punch 1. The demolding machine 3 is provided with a hollow portion 3a for inserting the punch 1. The hollow portion 3a is formed in the shape of a through hole into which the punch 1 can be inserted. In this embodiment, the hollow portion 3a has a circular cross-section with a diameter of 4.502 mm and is a through hole that penetrates the demolding machine 3 in the Z direction.

[0049] The demolding machine 3, like the punch 1, is made of a superhard material. As the superhard material constituting the demolding machine 3, an alloy equivalent to VM-30 of the Superhard Tool Specifications Society (CIS) can be used.

[0050] The lower die 102 is equipped with a punch 2, a demolding guide 10, and a lower stop 26. Additionally, the lower die 102 is equipped with a template 5 for fixing the punch 2, a punch back plate 30 for dispersing impact during processing, and a lower die holder 31. The demolding guide 10 is a component for positioning the demolding guide pin 8. The lower stop 26 is a component for restricting the movement of the punch 1.

[0051] In this embodiment, a position sensor 11 is disposed on the lower die 102. The position sensor 11 detects the distance between the punch 1 and the lower dead center by detecting the position of the block 32 disposed on the upper die 101. Furthermore, the lower dead center represents the lowest position that the punch 1 can achieve. The position sensor 11 is, for example, a displacement sensor capable of measuring a small distance interval between itself and the object being measured in a non-contact manner.

[0052] The die 2 is a tool used to hold the workpiece during stamping. The die 2 has a hollow portion 2a into which a punch 1 is inserted. The hollow portion 2a is formed in the shape of a through hole into which the punch 1 can be inserted. In this embodiment, the hollow portion 2a has a circular cross-section with a diameter of 4.506 mm and is a through hole that penetrates the die 2 in the Z direction.

[0053] The die 2, like the punch 1 and the demolding machine 3, is made of, for example, a superhard material. As the superhard material constituting the die 2, an alloy equivalent to VF-40 of the Superhard Tool Specifications Society (CIS) can be used.

[0054] In addition, in this embodiment, such as Figures 2-4 As shown, an output unit 16 is connected to the control unit 12 of the determination device 100. The output unit 16 is composed of, for example, a display such as a liquid crystal display that displays visual information, or a speaker such as a sound or buzzer that displays auditory information.

[0055] [Determining whether the gap is appropriate] Reference Figures 2-4 and Figures 5A to 5G The determination of whether the gap is appropriate by the determination device 100 is explained. Figures 5A to 5GThis is a brief explanation of... Figure 2 A diagram showing the operation of punch 1, demolding machine 3, and die 2 in stamping die 150.

[0056] In this embodiment, the control unit 12 determines whether the clearance is appropriate based on the detection value of the load sensor 6 when the punch 1 is moved while the stamping die 150 is not installed on the stamping processing device. The determination of whether the clearance is appropriate is based on the... Figures 2-4 The upper die 101 of the stamping die 150, located above the lower die 102, descends toward the lower die 102 until the punch 1 reaches its lower stop point. The subsequent retraction of the upper die 101 is based on the load sensor's reading. The descent and ascent of the upper die 101 are performed, for example, by using suspension bolts mounted on the upper die holder 29 and by moving the upper die 101 up and down using a crane or similar device.

[0057] Figure 2 This indicates that the upper mold 101 has not moved from its initial position. That is, in... Figure 2 In the middle, punch 1 is located at the highest position that punch 1 can reach, namely the top dead center. Figure 2 In this state, since no load is applied to punch 1, the detection value of load sensor 6 is 0. At this time, punch 1, die 2, and demolding machine 3 are in a state of equilibrium. Figure 5A The positional relationship is shown.

[0058] Figure 3 This indicates that the upper mold 101 has begun to descend, and the ejector plate 4 is in contact with the plate 5. At this time, the punch 1, the die 2, and the ejector 3 are in the following state: Figure 5B The positional relationship is shown. When the ejector plate 4 contacts the plate 5, and the upper die 101 descends further, the punch 1 descends further while the ejector machine 3 is stationary. When the upper die 101 moves from... Figure 3 and Figure 5B When the state further declines, the punch 1 from Figure 5B The position change is Figure 5C The location. In Figures 5B to 5C Between these times, the positions of die 2 and demolding machine 3 remain unchanged; only the position of punch 1 changes. Therefore, when the upper die 101 moves from... Figure 3 As the state of the die descends further, the punch 1 begins to move relative to the demolding machine 3. This relative movement of the punch 1 relative to the demolding machine 3 generates sliding resistance between the inner wall of the hollow portion 3a of the demolding machine 3 and the side surface 1b of the punch 1. This sliding resistance becomes a load on the punch 1. Therefore, the die 101 descends from its lower position until it reaches its final position. Figure 3 From the state of [condition], a load is applied to punch 1.

[0059] Figure 4 This shows the state where the upper die 101 descends further while the punch 1 is at the lower dead center. At this time, the punch 1, die 2, and demolding machine 3 are in a state of... Figure 5DThe positional relationship is shown. When the punch 1 is stationary at the lower dead center, the sliding resistance between the side 1b of the punch 1 and the inner wall of the hollow part 3a of the demolding machine 3 is continuously applied, and the detection value of the load sensor 6 becomes approximately the same as the value when the punch 1 reaches the lower dead center.

[0060] from Figure 4 From the state of motion, the upper die 101 moves away from the lower die 102, and the stamping die 150 passes through... Figure 3 Return to the state Figure 2 The state of the punch 1, die 2, and demolding machine 3. The positional relationship between punch 1, die 2, and demolding machine 3, starting from when punch 1 is at its lower dead center. Figure 5D The state of Figure 5E , Figure 5F The order changes, return Figure 5G The state. It should be noted that, in Figure 5A and Figure 5G In the middle, the positions of punch 1, die 2 and demolding machine 3 are equal.

[0061] Next, refer to Figure 6 The gap between the side 1b of the punch 1 and the inner wall of the hollow part 3a of the demolding machine 3 will be explained. Figure 6 This is a schematic diagram used to illustrate the gap between punch 1 and demolding machine 3.

[0062] As described above, the stamping surface 1a of the punch 1 is formed into a circle with a diameter of 4.5 mm. Furthermore, the hollow portion 3a of the demolding machine 3 is formed as a through hole with a circular cross-section, allowing the punch 1 to be inserted. The diameter of the cross-section of the hollow portion 3a of the demolding machine 3 is 4.502 mm. Therefore, as... Figure 6 As shown, the gap c1 between the inner wall of the hollow portion 3a of the demolding machine 3 and the side surface 1b of the punch 1 is c1 = 0.001 mm. Furthermore, the hollow portion 2a of the die 2 is formed as a through hole with a circular cross-section to allow the punch 1 to be inserted. The diameter of the cross-section of the hollow portion 2a of the die 2 is 4.506 mm. Therefore, the gap c2 between the hollow portion 2a of the die 2 and the punch 1 is c2 = 0.003 mm. It should be noted that the shapes and sizes of the punch 1, the hollow portion 3a of the demolding machine 3, and the hollow portion 2a of the die 2 are merely examples and are not limited to the shapes and sizes described above.

[0063] Typically, the positional relationship between the punch 1 and the die 2 is adjusted such that the gap between the die 2 and the punch 1 is approximately 1 / 10 of the thickness of the workpiece. To guide the punch 1 using the hollow portion 3a of the ejector 3, it is preferable that the gap between the ejector 3 and the punch 1 is smaller than the gap between the die 2 and the punch 1. Therefore, the positional relationship between the punch 1 and the ejector 3 is adjusted such that the gap c1 between the ejector 3 and the punch 1 is a value that is at least 1 / 3 and less than 1 / 2 of the gap c2 between the die 2 and the punch 1. In this embodiment, an appropriate value for the gap c1 between the punch 1 and the ejector 3 can be set, for example, to be at least 0.001 mm and less than 0.0015 mm.

[0064] Figure 7 This is a flowchart illustrating the judgment process performed by the judgment device 100 to determine whether the gap is appropriate. (Refer to...) Figure 7 The method for determining and handling gaps is explained.

[0065] In step S1, during the period from the descent of the upper die 101 toward the lower die 102 until the upper die 101 rises again to return to its original position, the load sensor 6 detects the load applied to the punch 1.

[0066] Next, in step S2, the control unit 12 determines whether the value of the load applied to the punch 1 detected by the load sensor 6 exceeds a predetermined threshold.

[0067] If the load applied to the punch 1 exceeds the specified threshold, i.e. if the condition is true in step S2, the control unit 12 determines in step S3 that the gap is inappropriate.

[0068] If the load applied to the punch 1 is below a specified threshold, i.e. if step S2 is not true, then in step S4, the control unit 12 determines that the gap is appropriate.

[0069] The following provides a detailed explanation of the processing of each of steps S1 to S4.

[0070] In step S1, the load sensor 6 detects the load applied to the punch 1 from the moment it starts moving from the top dead center towards the bottom dead center until it returns to the top dead center after reaching the bottom dead center. For example, the movement of the punch 1 can be detected by using the position sensor 11 to detect the position of the punch 1. At this time, the sensor controller 13 of the control unit 12 outputs the detection value of the load sensor 6 to the arithmetic unit 14 of the control unit 12.

[0071] In step S2, the arithmetic unit 14 of the control unit 12 calculates the relationship between the detection value of the load sensor 6 and time. The relationship between the detection value of the load sensor 6 and time can be calculated, for example, by... Figure 8 The chart shown represents this. Figure 8It is a graph showing the relationship between the load applied to the punch 1 and time when the clearance between the punch 1 and the demolding machine 3 is appropriate.

[0072] exist Figure 8 In the chart, the left vertical axis represents the load applied to the punch (unit: N), the right vertical axis represents the distance from the bottom dead center of punch 1 (unit: mm), and the horizontal axis represents time (unit: msec). Additionally, the dashed line represents the distance from the bottom dead center of punch 1, i.e., the position of the punch, while the dashed line represents the load applied to punch 1. Figure 8 The graph shows that at time 0, punch 1 is at the top dead center. As time passes, punch 1 descends and reaches the bottom dead center at time C2. At time C3, punch 1 begins to rise again. It should be noted that the distance of punch 1 from the bottom dead center can be detected, for example, by position sensor 11.

[0073] When the upper die 101 descends, the punch 1 and the demolding machine 3 descend together from the top dead center. At time C1, the demolding plate 4 contacts the plate 5. Figure 8 In the example, up to time C1, that is, from the point where the punch 1 starts to descend downwards until the template 4 and template 5 come into contact, time T0 has elapsed.

[0074] When the upper die 101 is lowered further, the demolding machine 3 stops descending as the demolding plate 4 contacts the plate 5, but the punch 1 continues to descend. At this time, the punch 1 moves relative to the demolding machine 3, thereby generating sliding resistance between the inner wall of the hollow portion 3a of the demolding machine 3 and the side surface 1b of the punch 1. The load generated by the sliding resistance between the demolding machine 3 and the punch 1 is applied to the punch 1, and the load is detected by the load sensor 6. Figure 8 The diagram shows the load of size P1 detected by load sensor 6. When the demolding machine 3 is stationary, the sliding resistance of the punch 1 during descent is approximately constant.

[0075] When the upper die 101 descends further, at time C2, the upper stop 25 abuts against the lower stop 26, and the descent of the upper die 101 stops. The time from time C1 to the descent of the punch 1 stopping is time T1. During the period from time C1 to time C2, as... Figure 8 As shown, a load of size P1 is applied to punch 1.

[0076] During the period from time C2 to time C3, although punch 1 is stationary at the bottom dead center, a sliding resistance is applied, thus applying a load of magnitude P1 to punch 1. The time during which punch 1 is stationary at the bottom dead center is time T2.

[0077] Subsequently, if the upper die 101 is raised at time C3, the upper stop 25 and the lower stop 26 will first separate, and the punch 1 will rise while the ejector plate 4 and the plate 5 are in contact. Since the ejector plate 4 and the plate 5 are still in contact, sliding resistance will be generated again between the ejector 3 and the punch 1.

[0078] As the upper die 101 continues to rise, the ejector plate 4 also begins to rise along with the upper die 101, and at time C4, the ejector plate 4 separates from the plate 5. The time from time C3 to time C4 is time T3. During the period from time C3 to time C4, a load P1 of the same magnitude as that from time C1 to time C2 is applied to the punch 1.

[0079] After the demolding plates 4 and 5 separate at time C4, the demolding machine 3 and the punch 1 rise together, so the sliding resistance becomes 0 again, and the load applied to the punch 1 also becomes 0. The time from time C4 to time C5 when the punch 1 returns to the top dead center is time T4.

[0080] By lowering and raising the upper die 101 at a predetermined speed, the timing of times C1 to C5 is approximately the same each time. In other words, the lengths of times T0 to T4 are approximately the same each time. Therefore, the timing of times C1 to C5 can be estimated based on the time from the start of the descent of the punch 1, instead of the position sensor 11. However, depending on the speed of the descent and rise of the upper die 101, there are cases where the timing of times C1 to C5 differs.

[0081] like Figure 8 As shown, a load is applied to the punch 1 during the period from time C1 to time C4. In step S3, the determination unit 15 determines whether the gap is appropriate based on the detection value of the load sensor from time 0 when the punch 1 starts moving from the top dead center towards the bottom dead center to time C5 when the punch 1 returns to the top dead center after reaching the bottom dead center. In other words, the determination unit 15 can determine that the gap is appropriate if the maximum value of the load applied to the punch 1 from time 0 to time C5 is below a predetermined threshold P2.

[0082] The smaller the gap between the punch 1 and the demolding machine 3, the greater the sliding resistance between them. Therefore, if the load applied to the punch 1 exceeds the predetermined threshold P2, the gap is too small, and the determination unit 15 can determine that it is inappropriate. Furthermore, in this embodiment, the determination unit 15 determines the case where the gap is smaller than the appropriate value, but does not determine the case where the gap is larger than the appropriate value.

[0083] exist Figure 8In the example, a load of size P1 is applied to the punch 1 during the period from time C1 to time C4. The load of size P1 does not exceed the predetermined threshold P2, so the determination unit 15 can determine that the gap between the punch 1 and the demolding machine 3 is appropriate.

[0084] The specified threshold P2 can be set to, for example, 1.0N. The specified threshold P2 can be determined by the clearance and die structure, which are determined by the material or thickness of the workpiece and / or the punching shape of the punch 1.

[0085] Figure 9 This is a graph showing the relationship between the load applied to punch 1 and time when the clearance between punch 1 and demolding machine 3 is inappropriate. Figure 9 In the chart, with Figure 8 Similarly, the left vertical axis represents the load applied to the punch (unit: N), the right vertical axis represents the distance from the bottom dead center of punch 1 (unit: mm), and the horizontal axis represents time (unit: msec).

[0086] exist Figure 9 In the example, a load of magnitude P3 is applied to the punch 1 during the period from time C1 to time C4. Therefore, the maximum value of the load applied to the punch 1 during the period from time 0 to time C5 exceeds the predetermined threshold P2, so the determination unit 15 determines that the gap between the punch 1 and the demolding machine 3 is inappropriate.

[0087] After the determination unit 15 determines whether the clearance is appropriate, the control unit 12 can also output the determination result to the output unit 16. Based on the determination result, the assembly of the stamping die 150 is adjusted, the clearance is adjusted, and the clearance is determined again, thereby ensuring that the appropriate clearance between the punch 1 and the demolding machine 3 is maintained.

[0088] In this embodiment, even without the stamping die 150 being installed on the stamping processing apparatus, it is possible to determine whether the gap between the punch 1 and the demolding machine 3 is appropriate. By determining whether the gap is appropriate during the die adjustment stage before installation on the stamping processing apparatus, the gap between the punch 1 and the demolding machine 3 can be set with higher precision.

[0089] [Effect] According to the above implementation method, the following effects can be achieved.

[0090] The determining device 100 is used in a stamping die 150 having a punch 1, a demolding machine 3, and a die 2 to determine whether the size of the gap between the side 1b of the punch 1 and the inner wall of the hollow portion 3a of the demolding machine 3 is appropriate. The determining device 100 includes a load sensor 6 and a control unit 12. The load sensor 6 detects the load applied to the punch 1. The control unit 12 determines whether the gap size is appropriate based on the detection value of the load sensor 6. If the detection value of the load sensor 6 exceeds a predetermined threshold P2, the control unit 12 determines that the gap is inappropriate.

[0091] This structure provides a device for determining whether the gap between the side of the punch and the inner wall of the hollow part of the demolding machine is appropriate.

[0092] The control unit 12 determines whether the gap is appropriate based on the detection value of the load sensor 6 from the time the punch 1 starts moving from the top dead center to the bottom dead center until the punch 1 returns to the top dead center after reaching the bottom dead center.

[0093] This structure allows for a more precise determination of whether the gap is appropriate.

[0094] The control unit 12 determines whether the clearance is appropriate based on the detection value of the load sensor 6 when the punch 1 is moved while the stamping die 150 is not installed on the stamping processing device.

[0095] This structure improves the maintainability of the stamping die 150.

[0096] In a stamping die having a punch 1, a demolding machine 3, and a die 2, a method for determining whether the size of the gap between the side 1b of the punch 1 and the inner wall of the hollow portion 3a of the demolding machine 3 is appropriate includes: a step of detecting the load applied to the punch 1; and a step of determining whether the gap is appropriate based on the detected load. The step of determining whether the size of the gap is appropriate includes determining that the gap is inappropriate if the detected load exceeds a predetermined threshold.

[0097] This structure provides a method for determining whether the gap between the side of the punch and the inner wall of the hollow part of the demolding machine is appropriate.

[0098] Furthermore, in the above embodiment, an example of the stamping surface 1a of the punch 1 being formed as a circle was described, but it is not limited to this. The stamping surface 1a of the punch 1 can also be any shape. In addition, the shapes of the hollow portion 3a of the demolding machine 3 and the hollow portion 2a of the die 2 can be arbitrarily set according to the shape of the punch 1.

[0099] Furthermore, in the above embodiment, an example of the demolding machine 3 being fixed to the demolding template 4 has been described, but the embodiment is not limited to this. The demolding machine 3 and the demolding template 4 may also be integrally formed.

[0100] Furthermore, while the above embodiment describes an example of the die 2 being fixed to the template 5, it is not a limitation. The die 2 and the template 5 may also be integrally formed.

[0101] Furthermore, while the above embodiment describes an example of using a crane to raise and lower the upper mold 101, it is not limited to this. For example, instead of a crane, the upper mold 101 can be mounted on a device capable of vertical movement, thereby raising and lowering the upper mold 101.

[0102] Furthermore, in the above embodiment, an example of the determination device 100 including the load sensor 6 has been described, but it is not limited to this. The control unit 12 of the determination device 100 may also obtain information related to the load of the punch 1 from the outside and determine whether the gap is appropriate based on this information.

[0103] Furthermore, in the above embodiment, an example of using position sensor 11 to detect the position of punch 1 was described, but it is not limited to this. Control unit 12 may also estimate the position of punch 1 based on the time from when punch 1 begins to descend.

[0104] Furthermore, while the above embodiments illustrate an example where the specified threshold P2 is 1.0N, this is not a limitation. The specified threshold P2 can be a value calculated through statistical processing, machine learning, or the like.

[0105] Furthermore, the above embodiment describes an example of determining whether the clearance is appropriate based on the load applied to the punch 1 during one cycle from the punch 1 moving from the top dead center to the bottom dead center and then back to the top dead center, but it is not limited to this. For example, it is also possible to repeatedly perform multiple cycles from the punch 1 moving from the top dead center to the bottom dead center and then back to the top dead center, and determine whether the clearance is appropriate based on the load applied to the punch 1.

[0106] In the above embodiment, an example has been described in which the determination unit 15 of the control unit 12 determines whether the gap is appropriate based on the detection value of the load sensor 6 from when the punch 1 starts moving from the top dead center towards the bottom dead center until the punch 1 reaches the bottom dead center and then returns to the top dead center. However, this is not a limitation. (See reference...) Figures 8-9As explained, a load is applied to the punch 1 during the period from time C1 to time C4, and the load applied to the punch 1 is 0 during the periods from time 0 to time C1 and from time C4 to time C5. Therefore, the determination unit 15 can also determine whether the clearance is appropriate based on the detection value of the load sensor during a predetermined period from when the punch 1 starts moving from the top dead center to the bottom dead center. Specifically, the determination unit 15 can also determine whether the clearance between the punch 1 and the demolding machine 3 is appropriate based on the load applied to the punch 1 during the period from time C1 to time C4.

[0107] [Variation Example] Figure 10 This is a schematic diagram showing the load sensor 60 included in the determination device of Modification 1 of Embodiment 1. Figure 10 As shown, the load sensor 60 may also include four load sensors 6a to 6d. In this case, the four load sensors 6a to 6d may also be arranged at equal intervals on the surface of the punch 1 opposite to the stamping surface 1a. Figure 10 In this example, four load sensors 6a-6d are arranged at 90-degree intervals along the outer periphery of the stamping surface 1a of the punch 1. Furthermore, the determination unit 15 of the control unit 12 can determine the location of any improperly spaced portion in the side surface 1b of the punch 1 based on the detection values ​​of the four load sensors 6a-6d. With this structure, the gap between the punch 1 and the demolding machine 3 can be adjusted with higher precision.

[0108] (Implementation Method 2) Reference Figures 11-13 Embodiment 2 will now be described. Furthermore, in Embodiment 2, structures that are the same as or equivalent to those in Embodiment 1 will be described using the same reference numerals. Additionally, in Embodiment 2, descriptions that are repeated in Embodiment 1 will be omitted.

[0109] Figure 11 This is a diagram that schematically illustrates the stamping apparatus 200 according to Embodiment 2. Figures 12-13 It means by Figure 11 A graph showing the relationship between the load applied to the punch 1 and time, obtained from the stamping apparatus 200. (See figure.) Figure 11 As shown, in Embodiment 2, the difference from Embodiment 1 is that the control unit 12 determines whether the gap is appropriate based on the detection value of the load sensor 6 when the punch 1 is moved while the stamping die 150 is mounted on the stamping processing device and the workpiece 22 is placed on the stamping die 2.

[0110] The stamping apparatus 200 includes a punch 1, a demolding machine 3, a die 2, and a judging device 100, and is used for blanking workpiece 22. The stamping apparatus 200 includes the stamping die 150 and the judging device 100 described in Embodiment 1. In Embodiment 2, the judging device 100, in the stamping apparatus 200 on which the stamping die 150 is mounted, detects the load applied to the punch 1 during blanking of the workpiece 22, and determines whether the clearance between the punch 1 and the demolding machine 3 is appropriate based on the detected load.

[0111] First, refer to Figure 11 The stamping apparatus 200 will be described. The stamping apparatus 200 is a device for blanking a sheet-shaped workpiece 22. The stamping apparatus 200 is, for example, a servo screw stamping device capable of high-precision control. In the stamping apparatus 200, a stamping die 150 is mounted on the main body 18 of the stamping apparatus. Figure 11 As shown, the upper die 101 of the stamping die 150 is mounted on the sliding member 20 of the stamping device body 18, and the lower die 102 of the stamping die 150 is mounted on the pad 21 of the stamping device body 18. The upper die 101 is mounted on the sliding member 20 via a spring 23 and a spiral plug 24. The stamping die 150 has the same structure as the stamping die 150 described in Embodiment 1, therefore, the description is omitted.

[0112] In the stamping apparatus 200, based on instructions from the stamping controller 17, the servo motor 19 rotates, causing the slider 20 to move up and down along the stamping direction (Z direction), thereby enabling the blanking process on the workpiece 22. During the blanking process, the slider 20 descends, and the die release machine 3 presses the workpiece 22 onto the die 2. With the workpiece 22 pressed by the die release machine 3, the punch 1 performs the blanking process on the workpiece 22.

[0113] In the stamping processing apparatus 200, multiple processing objects 22 or processing objects 22 in the form of coils are transported along the X or Y direction by the conveying section (not shown) in conjunction with the stamping action of the stamping apparatus body 18, and the stamping processing is performed sequentially.

[0114] In this embodiment, the workpiece 22 is, for example, made of SUS301-EH, a type of stainless steel classified as austenitic stainless steel. SUS301-EH is, for example, a material used for springs or clockwork mechanisms in automotive parts. The workpiece 22 has, for example, a thickness of 0.03 mm, a height of 529 HV, and a tensile strength of 1,679 N / mm². 2 .

[0115] The stamping controller 17 drives the servo motor 19, causing the slider 20 to move up and down in the stamping direction (Z direction) at a predetermined speed. The stamping controller 17 is composed of digital circuits such as microcomputers, CPUs, MPUs, GPUs, DSPs, FPGAs, and ASICs. The stamping controller 17 may also be the same hardware as the control unit 12 of the determination device 100.

[0116] The determination device 100 determines whether the gap between the punch 1 and the demolding machine 3 is appropriate based on the detection value of the load sensor 6 when the punch 1 is moved with the stamping die 150 installed on the stamping processing device 200 and the workpiece 22 placed on the die 2.

[0117] Reference Figures 12-13 The diagram illustrates the load applied to the punch 1 during the blanking process of the workpiece 22. When the stamping controller 17 drives the servo motor 19, the sliding member 20 descends together with the upper die 101. At time C10, the ejector plate 4 (ejector 3) abuts against the die plate 5 (punch 2). It should be noted that during the blanking process of the workpiece 22, the ejector plate 4 (ejector 3) and the die plate 5 (punch 2) sometimes do not directly contact each other, but rather abut against each other via the workpiece 22.

[0118] When the upper die 101 is lowered further, during the period from time C10 to time C11, the punch 1 descends while the demolding machine 3 is stationary. At this time, sliding resistance is generated between the punch 1 and the demolding machine 3, so the load sensor 6 detects the load of size P1 applied to the punch 1.

[0119] At time C11, punch 1 comes into contact with workpiece 22. If punch 1 comes into contact with workpiece 22, causing upper die 101 to descend, punch 1 punches workpiece 22. At time C12, workpiece 22 is punched by punch 1 and becomes an open hole. The maximum value detected by load sensor 6 during the period from time C11 to time C12 is taken as the load applied to punch 1. The load detected during the period when punch 1 punches workpiece 22, i.e., during the period from time C11 to time C12, is the load applied to punch 1 during punching workpiece 22 and cannot be used for gap determination.

[0120] As the upper die 101 descends further, at time C13, the punch 1 reaches the lower dead center. During the period from time C13 to time C14, the punch 1 remains stationary at the lower dead center. Specifically, during the period from time C12 to time C14, the workpiece 22 (i.e., scrap) that falls into the hollow portion of the die 2 due to the punching action of the punch 1 sometimes generates a load between the punch 1 and the workpiece 22. In this case, the load applied to the punch 1 sometimes becomes a value larger than the magnitude P1.

[0121] Then, at time C14, the upper mold 101 is raised again, and at time C15, the demolding template 4 (demolding machine 3) and the template 5 (punch 2) that are contacted by the processing object 22 separate.

[0122] The upper die 101 is then raised further, and at time C16, the punch 1 returns to the top dead center. The load applied to the punch 1 between time C15 and time C16 is 0.

[0123] As described above, the load sensor 6 detects the load during the blanking process of the workpiece 22, as well as the load generated by the friction between the blanked workpiece 22 and the punch 1. Therefore, in order to more accurately determine whether the gap between the punch 1 and the demolding machine 3 is appropriate, the control unit 12 determines whether the gap is appropriate based on the load detected by the load sensor 6 during the period from time C10 to time C11, when there is no influence from the workpiece 22. In other words, the control unit 12 determines whether the gap is appropriate based on the detection value of the load sensor 6 from the moment the demolding machine 3 and the die 2 come into contact via the workpiece 22 until the moment the punch 1 comes into contact with the workpiece 22.

[0124] The control unit 12 can also determine whether the gap is appropriate based on the detection value of the load sensor 6 between time C14 and time C15 when the influence of the workpiece 22 is minimal. In other words, the control unit 12 can also determine whether the gap is appropriate based on the detection value of the load sensor 6 from the time the workpiece 22 is punched from the punch 1 until it returns to the top dead center.

[0125] Figure 12 This illustrates an example of an appropriate clearance between punch 1 and demolding machine 3. Figure 13 This indicates an inappropriate gap between punch 1 and demolding machine 3. For example, in... Figure 12 In the example, the load applied to punch 1 between time C10 and time C11 is of magnitude P1, which is smaller than the specified threshold P2. Therefore, in Figure 12 In this case, the determination unit 15 of the control unit 12 determines that the gap is appropriate. On the other hand, in Figure 13 In the example, the load applied to punch 1 during the period from time C10 to time C11 is magnitude P3, which exceeds the specified threshold P2. Therefore, in Figure 13 In such cases, the determination unit 15 of the control unit 12 determines that the gap is inappropriate. The control unit 12 may also output the determination result to the output unit 16.

[0126] The control unit 12 can determine whether the clearance is appropriate during the processing of the stamping processing equipment 200. If the clearance is determined to be inappropriate during processing, the stamping controller 17 stops the drive of the servo motor 19, temporarily stops production, and can adjust the stamping die 150.

[0127] (Supplementary Explanation) The following technology is disclosed through the above implementation methods.

[0128] (Technology 1) A determining device is provided for determining whether the size of the gap between the side of the punch and the inner wall of the hollow part of the demolding machine is appropriate in a stamping die having a punch, a demolding machine having a hollow part for punch insertion, and a die. The device includes: a load sensor for detecting the load applied to the punch; and a control unit for determining whether the gap is appropriate based on the detection value of the load sensor. If the detection value of the load sensor exceeds a predetermined threshold, the control unit determines that the gap is inappropriate.

[0129] This structure provides a device for determining whether the gap between the side of the punch and the inner wall of the hollow part of the demolding machine is appropriate.

[0130] (Technology 2) According to the determination device of Technology 1, the control unit determines whether the gap is appropriate based on the detection value of the load sensor from the moment the punch starts moving from the top dead center toward the bottom dead center until the punch returns to the top dead center after reaching the bottom dead center.

[0131] This structure allows for a more accurate determination of whether the gap between the punch and the demolding machine is appropriate.

[0132] (Technology 3) According to the determination device of technology 1 or 2, the control unit determines whether the clearance is appropriate based on the detection value of the load sensor when the punch is moved in a state where the stamping die is not installed on the stamping processing device.

[0133] This structure allows for proper maintenance of the clearance before the stamping die is installed on the stamping processing device.

[0134] (Technology 4) According to the determination device of technology 3, the control unit determines whether the gap is appropriate based on the detection value of the load sensor during a predetermined period from when the punch starts moving from the top dead center toward the bottom dead center until the punch returns to the top dead center after reaching the bottom dead center.

[0135] This structure allows for a more accurate determination of whether the gap between the punch and the demolding machine is appropriate.

[0136] (Technology 5) According to the determination device of technology 1 or 2, the control unit determines whether the clearance is appropriate based on the detection value of the load sensor when the punch is moved in a state where the stamping die is installed on the stamping processing device and the workpiece is placed on the stamping die.

[0137] This structure allows for the determination of whether the clearance between the punch and the demolding machine is appropriate during production. Therefore, if an inappropriate clearance is detected during production, it can be addressed in advance, thus improving production efficiency.

[0138] (Technology 6) According to the determination device of technology 5, the control unit determines whether the gap is appropriate based on the detection value of the load sensor from the moment the demolding machine and the die come into contact with the workpiece until the moment the punch comes into contact with the workpiece.

[0139] This structure allows for the determination of whether the gap between the punch and the demolding machine is appropriate, by eliminating the influence of the workpiece.

[0140] (Technology 7) According to the determination device of technology 5 or 6, the control unit determines whether the gap is appropriate based on the detection value of the load sensor from the time the punch leaves the workpiece until it returns to the top dead center.

[0141] With this structure, the impact on the workpiece can be reduced when determining whether the gap between the punch and the demolding machine is appropriate.

[0142] (Technology 8) According to the determination device of any one of techniques 1 to 7, the load sensor includes a plurality of load sensors.

[0143] This structure allows for more precise determination of whether the gap between the punch and the demolding machine is appropriate.

[0144] (Technology 9) According to the determination device of technology 8, multiple load sensors are equally spaced on the side of the punch opposite to the stamping surface.

[0145] This structure allows us to identify areas where the gaps are inappropriate.

[0146] (Technology 10) According to the determination device of technology 8 or 9, the control unit determines the location of the part with inappropriate clearance in the side of the punch based on the detection values ​​of multiple load sensors.

[0147] This structure allows for easy adjustment of the gap between the punch and the demolding machine.

[0148] (Technology 11) A method for determining whether the size of the gap between the side of the punch and the inner wall of the hollow part of the demolding machine is appropriate in a stamping die having a punch, a demolding machine having a hollow part for punch insertion, and a die, comprising: a step of detecting a load applied to the punch; and a step of determining whether the gap is appropriate based on the detected load, wherein the step of determining whether the gap is appropriate includes: if the detected load exceeds a predetermined threshold, determining that the gap is inappropriate.

[0149] This structure provides a method for determining whether the gap between the side of the punch and the inner wall of the hollow part of the demolding machine is appropriate.

[0150] (Technology 12) A stamping apparatus comprising: a punch; a demolding machine having a hollow portion for insertion of the punch; a die; and a determining device according to any one of techniques 1 to 10.

[0151] This structure provides a stamping device that can determine whether the gap between the side of the punch and the inner wall of the hollow part of the demolding machine is appropriate.

[0152] According to this disclosure, a determination device, a determination method, and a stamping apparatus are provided for determining whether the size of the gap between the side of the punch and the inner wall of the hollow part of the demolding machine is appropriate.

[0153] [Industrial Applicability] The determination device, determination method, and stamping apparatus disclosed herein are useful in determining whether the clearance between the punch in the stamping die and the demolding machine is appropriate when stamping any workpiece used in household appliances or medical equipment.

Claims

1. A determining device, A determining device for judging whether the size of the gap between the side of the punch and the inner wall of the hollow part of the demolding machine is appropriate is provided in a demolding machine having a punch, a demolding machine having a hollow part for inserting the punch, and a die. The device includes: A load sensor detects the load applied to the punch; and The control unit determines whether the gap is appropriate based on the detection value of the load sensor. If the load sensor detects a value exceeding a predetermined threshold, the control unit determines that the gap is inappropriate.

2. The determining device according to claim 1, wherein, The control unit determines whether the gap is appropriate based on the detection values ​​of the load sensor from the moment the punch starts moving from the top dead center towards the bottom dead center until the punch returns to the top dead center after reaching the bottom dead center.

3. The determining device according to claim 2, wherein, The control unit determines whether the clearance is appropriate based on the detection value of the load sensor when the punch is moved while the stamping die is not installed on the stamping processing device.

4. The determining device according to claim 3, wherein, The control unit determines whether the gap is appropriate based on the detection values ​​of the load sensor during a predetermined period from when the punch starts moving from the top dead center toward the bottom dead center until the punch returns to the top dead center after reaching the bottom dead center.

5. The determining device according to claim 2, wherein, The control unit determines whether the clearance is appropriate based on the detection value of the load sensor when the punch is moved while the stamping die is mounted on the stamping processing device and the workpiece is placed on the stamping die.

6. The determining device according to claim 5, wherein, The control unit determines whether the gap is appropriate based on the detection values ​​of the load sensor from the moment the demolding machine and the die come into contact with the workpiece until the moment the punch comes into contact with the workpiece.

7. The determining device according to claim 5, wherein, The control unit determines whether the clearance is appropriate based on the detection value of the load sensor from when the punch cuts the workpiece and leaves the workpiece until it returns to the top dead center.

8. The determining device according to claim 1, wherein, The load sensor includes multiple load sensors.

9. The determining device according to claim 8, wherein, The plurality of load sensors are arranged at equal intervals on the side of the punch opposite to the stamping surface.

10. The determining device according to claim 8, wherein, The control unit determines the location of the improperly spaced portion of the punch's side based on the detection values ​​from the plurality of load sensors.

11. A determination method, A method for determining whether the size of the gap between the side of the punch and the inner wall of the hollow portion of the demolding machine is appropriate in a demolding machine having a punch, a hollow portion for inserting the punch, and a die, includes: The step of detecting the load applied to the punch; as well as The step of determining whether the gap is appropriate based on the detected load. The step of determining whether the gap is appropriate includes: if the detected load exceeds a predetermined threshold, determining that the gap is inappropriate.

12. A stamping processing apparatus, comprising: Punch head; A demolding machine having a hollow portion for the insertion of the punch; Stamping dies; and The determining device according to any one of claims 1 to 10.

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