Pressing punching device

Abstract

To provide a pressing punching device which prevents a certain load or above from acting on a load cell to enable application of the load cell which achieves fine resolution even when the load is large.SOLUTION: In a pressing punching device, a load cell 15 which detects a load applied to an object is disposed between a punch support member 13 which moves in a vertical direction and a pressing punch 14 which applies the load to the object. The pressing punch 14 and the load cell 15 are provided so as to be movable in the vertical direction with respect to the punch support member 13. Contact parts which separate from each other when the load applied to the object is smaller than or equal to a setting value and contact with each other when the load exceeds the setting value are respectively provided at the punch support member 13 and the pressing punch 14. The punch support member 13 and the pressing punch 14 have an action position where the contact parts separate from each other and the load applied to the object acts on the load cell 15 and a non-action position where the contact parts contact with each other and the load exceeding the setting value and applied to the object does not act on the load cell 15.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a pressure punch device that applies pressure to an object with a pressure punch, and more particularly to a pressure punch device that is suitable for use in a distortion correction device that corrects distortion occurring in a rod-shaped member as an object. [Background technology]

[0002] In this type of pressure punch device, a punch support member is fitted and supported in a punch guide member so that it can move up and down, and a pressure punch attached to the lower end of the punch support member presses a rod-shaped member (crankshaft) to correct distortion of the rod-shaped member caused by heat treatment, etc. The load applied by the pressure punch is detected by a load cell. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2004-261834 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in such conventional pressure punch devices, the load cell is disposed between the punch support member and the pressure punch, so that a load is always acting on the load cell. In particular, when the load is large, the load cell must be made to have a large load resistance, resulting in coarse resolution and making it difficult to achieve high-precision control.

[0005] An object of the present invention is to provide a pressure punch device which prevents a load above a certain level from being applied to a load cell and which can apply a load cell with fine resolution even under a large load. [Means for solving the problem]

[0006] In order to achieve this object, the present invention takes the following measures: The pressure punch device comprises a punch support member which can be freely moved in the vertical direction by a lifting means, a pressure punch which is attached to the tip of the punch support member and applies a load to an object, and a load cell which is arranged between the punch support member and the pressure punch and detects the load applied to the object, wherein the pressure punch and the load cell are arranged to be movable in the vertical direction relative to the punch support member, the punch support member and the pressure punch are provided with abutment portions which separate from each other when the load applied to the object is below a set value and which abut against each other when the load exceeds the set value, and the punch support member and the pressure punch have an operating position where both abutment portions are separated and the load applied to the object acts on the load cell, and a non-operating position where both abutment portions abut and the load applied to the object exceeding the set value does not act on the load cell.

[0007] In this case, an adjustment mechanism may be provided that adjusts the set value, and the adjustment mechanism may adjust the fluid pressure or the spring force. Effect of the Invention

[0008] As described above in detail, in the invention described in claim 1, the pressure punch and the load cell are provided so as to be movable vertically relative to the punch support member, the punch support member and the pressure punch are provided with abutment parts which separate from each other when the load applied to the object is equal to or less than a set value and come into contact with each other when the load exceeds the set value, and the punch support member and the pressure punch have an operating position where both abutment parts are separated and the load applied to the object acts on the load cell, and a non-operating position where both abutment parts come into contact and the load applied to the object in excess of the set value does not act on the load cell. Therefore, since the load applied to the object in excess of the set value does not act on the load cell in the non-operating position, it is possible to prevent a load above a certain level from acting on the load cell, and a load cell with fine resolution can be used even for large loads.

[0009] In addition, the invention described in claim 2 is provided with an adjustment mechanism that adjusts the set value freely. Therefore, since the set value can be adjusted freely, it can be set to an optimal set value according to the application.

[0010] In addition, in the invention described in claim 3, the adjustment mechanism allows the fluid pressure to be freely adjusted. Therefore, the set value can be set by adjusting the fluid pressure, so that the fluid pressure can be easily adjusted over a wide range from high pressure to low pressure.

[0011] In the invention described in claim 4, the adjustment mechanism allows the spring force to be freely adjusted. Therefore, the spring force can be adjusted to set a set value, so that the spring force does not require a pressure source and can be easily provided. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a front view showing a pressure punch device according to an embodiment of the present invention used in a distortion correction device. [Diagram 2] FIG. 2 is an enlarged cross-sectional view taken along line AA in FIG. [Diagram 3] FIG. 3 is an enlarged view of a main part B in FIG. [Figure 4] FIG. 11 is a cross-sectional view of a main part of another embodiment. [Diagram 5] FIG. 11 is a cross-sectional view of a main part showing a modified example of another embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, a pressure punch device according to one embodiment of the present invention will be described with reference to the drawings, in which the pressure punch device is used in a distortion correction device. In Figure 1, reference numeral 1 denotes a distortion correction device, which has a gate-shaped support frame 3 erected on a support stand 2. Reference numerals 4 and 5 denote rotating supports placed on the support stand 2, which rotatably support both ends of a rod-shaped member 6 as an object. The rotating supports 4 and 5 are movable horizontally, making it possible to support various rod-shaped members 6 with different axial lengths. Reference numeral 7 denotes an electric motor provided on the rotating support 4, which rotates the rod-shaped member 6. As the rod-shaped member 6 rotates, the amount of radial distortion of the rod-shaped member 6 is measured by a strain gauge (not shown).

[0014] Reference numeral 8 denotes a pressure punch device that is mounted on the top of the support frame 3 so as to be freely movable in the horizontal direction, and presses in the radially distorted parts of the rod-shaped member 6 from above to correct the distortion. Reference numeral 9 denotes a movable support table that is mounted on the support table 2 so as to be freely movable in the horizontal direction, and two support tables 10, 11 that support the rod-shaped member 6 are arranged spaced apart in the horizontal direction, and a displacement meter 12 that measures the radial displacement of the rod-shaped member 6 is located approximately in the center between the support tables 10, 11.

[0015] The movable support base 9 is positioned at the desired position between the two rotating support bases 4, 5, and the support bases 9, 10 support both axial sides of the distorted part of the rod-shaped member 6 to be pressed by the pressure punch device 8, while the amount of pressing of the rod-shaped member 6 by the pressure punch device 8 is measured by a displacement meter 11.

[0016] 1 and 2, the pressure punch device 8 is mainly composed of a punch support member 13, a pressure punch 14, and a load cell 15. The punch support member 13 is attached to the end of a piston rod 17 of a hydraulic cylinder 16 serving as a lifting means, and is provided so as to be movable vertically perpendicular to the horizontal direction by the hydraulic cylinder 16. The hydraulic cylinder 16 is provided upright, with the piston rod 17 facing downward, on a support member 18 provided on the support frame 3 so as to be movable horizontally. The piston rod 17 is slidably fitted into a cylindrical member 19 suspended from the support member 18. Reference numeral 20 denotes a linear scale which is attached to the support member 18 and measures the amount of vertical movement of the punch support member 13.

[0017] 2 and 3, the punch support member 13 is formed by joining a first member 13A, a second member 13B, and a third member 13C in this order from the top to the bottom of the paper in FIG. 2 to form a main body 21. The pressure punch 14 is provided at the tip of the punch support member 13, which is at the bottom of the paper in FIG. 2, and presses a distorted part of the rod-shaped member 6 with a protruding member 22 at its tip, thereby applying a load to the rod-shaped member 6. The pressure punch 14 also has a stepped member 23 at its rear end, which is at the top of the paper in FIG. 2 and faces the tip. The stepped member 23 is fitted into a fitting hole 24 formed in the third member 13C that constitutes the main body 21 of the punch support member 13 so as to be movable up and down.

[0018] The fitting hole 24 of the third member 13C has a small diameter hole and a large diameter hole connected to each other to form a connected step 24A. The connected step 24A of the fitting hole 24 is engaged with the connected step between the small diameter portion 23A and the large diameter portion 23B of the stepped member 23, preventing the stepped member 23 from slipping out to the outside. A storage space 25 is defined and formed inside the second member 13B constituting the main body 21 of the punch support member 13. Two pin members 26A and 26B are stored in the storage space 25, which are erected on the upper surface opposite to the lower surface of the stepped member 23 that is connected to the pressure punch 14. A plate-shaped member 27 is fitted into both pin members 26A and 26B so as to be movable in the vertical direction, and a load cell 15 is attached to the lower surface of the plate-shaped member 27.

[0019] The load cell 15 abuts the tip portion 15A on its underside against the abutment portion 23C on the upper surface of the stepped member 23, and the reaction force of the load applied to the rod-shaped member 6 acts from the convex member 22 through the pressure punch 14, the stepped member 23, and the abutment portion 23C, thereby detecting the load applied to the rod-shaped member 6.

[0020] Reference numeral 28 denotes an adjustment mechanism that adjustably sets the set value. A piston 29 is fitted inside the first member 13A constituting the main body 21 of the punch support member 13 so as to be movable in the vertical direction, and a piston rod 29A formed to protrude downward from the piston 29 abuts against the upper surface of the plate-like member 27. A working chamber 30 is defined above the piston 29 inside the first member 13A, and a fluid is introduced into the working chamber 30 by flowing through an introduction flow path 31 drilled in the first member 13A. An action force based on the pressure of the fluid introduced into the working chamber 30 acts on the piston 29, and this action force becomes the set value. The set value can be adjusted freely by changing the fluid pressure acting on the piston 29. Reference numeral 32 denotes a low-pressure flow path that connects the lower part of the piston 29 to a tank (not shown) and sets the pressure to atmospheric pressure.

[0021] 3, reference numeral 33 denotes a contact portion of the punch support member 13, which is formed on the lower surface of the second member 13B and faces the upper surface of the stepped member 23 of the pressure punch 14. Reference numeral 34 denotes a contact portion of the pressure punch 14, which is formed on the upper surface of the stepped member 23 and faces the lower surface of the second member 13B of the punch support member 13. When the load applied to the rod-shaped member 6 is equal to or lower than the set value determined by the fluid pressure described above, the two contact portions 33, 34 are spaced apart by a distance L (see FIG. 3), and when the load applied to the rod-shaped member 6 exceeds the set value, the punch support member 13 descends and the contact portions come into contact with each other.

[0022] The punch support member 13 and the pressure punch 14 have an operating position (shown in Figure 3) in which the two abutment portions 33, 34 are separated and the load applied to the rod-shaped member 6 acts on the load cell 15, and a non-operating position in which the two abutment portions 33, 34 abut and the load applied to the rod-shaped member 6 in excess of the aforementioned set value does not act on the load cell 15.

[0023] Next, the operation of this configuration will be described. 1, both ends of a rod-shaped member 6 are supported by rotary supports 4 and 5, and further, both axial sides of the distortion point of the rod-shaped member 6 are supported by supports 10 and 11 of a movable support 9. A pressure punch device 8 is positioned above the distortion point of the rod-shaped member 6.

[0024] In this state, the pressure punch device 8 moves the piston rod 17 of the hydraulic cylinder 16 downward, and both the punch support member 13 and the pressure punch 14 move downward. Then, the pressure punch 14 comes into contact with the rod-shaped member 6 and presses in the distorted portion. At this time, the load for pressing in the distorted portion of the rod-shaped member 6 is applied from the pressure punch 14 via the piston rod 17, the first member 13A of the punch support member 13, the fluid set to a set value introduced into the accommodation chamber 30, the piston 29, the plate-shaped member 27, the load cell 15, and the stepped member 23, as shown in FIG.

[0025] The load cell 15 detects the load applied to the rod-shaped member 6 by receiving a reaction force of the load applied to the rod-shaped member 6 through the pressure punch 14 and the stepped member 23. Based on this detection, distortion correction of the rod-shaped member 6 is started.

[0026] As shown in FIG. 3, when a load is applied to the rod-shaped member 6 to start distortion straightening, the load applied to the rod-shaped member 6 is equal to or less than a set value determined by the acting force based on the fluid pressure in the acting chamber 30, and the punch support member 13 and the pressure punch 14 are positioned in their acting positions with their contact portions 33, 34 spaced apart from each other.

[0027] In this state, when the load applied to the rod-shaped member 6 increases and exceeds the set value due to the acting force based on the fluid pressure in the acting chamber 30, the punch support member 13 moves downward and the abutment portion 33 abuts against the abutment portion 34 of the pressure punch 14, and the punch support member 13 and the pressure punch 14 are placed in a non-acting position.

[0028] When the punch support member 13 and the pressure punch 14 are in their non-operating positions, the load for pressing the distorted portion of the rod-shaped member 6 is applied from the piston rod 17 to the pressure punch 14 via the first member 13A and second member 13B of the punch support member 13, the two abutting contact portions 33 and 34, and the stepped member 23. At this time, the reaction force of the load applied to the rod-shaped member 6 acts on the second member 13B of the punch support member 13 from the pressure punch 14, via the stepped member 23 and the two abutting contact portions 33 and 34, and does not act on the load cell 15.

[0029] Then, the distorted part of the rod-shaped member 6 is pressed in, the radial displacement of the rod-shaped member 6 is measured by the displacement meter 11, and when the displacement reaches a desired value, the pressure punch device 8 moves the piston rod 17 of the hydraulic cylinder 16 upward, and both the punch support member 13 and the pressure punch 14 move upward and return to the state shown in Fig. 1. Then, because the punch support member 13 moves upward relative to the pressure punch 14, both contact portions 33, 34 move away from each other and return to the operating position shown in Fig. 3.

[0030] In this operation, the pressure punch 14 and the load cell 15 are provided so as to be movable vertically relative to the punch support member 13, and the punch support member 13 and the pressure punch 14 are provided with abutment portions 33, 34 which are separated from each other when the load applied to the rod-shaped member 6 as the object is equal to or less than a set value and which abut against each other when the load exceeds the set value, and the punch support member 13 and the pressure punch 14 have an operating position where the abutment portions 33, 34 are separated and the load applied to the rod-shaped member 6 acts on the load cell 15, and a non-operating position where the abutment portions 33, 34 abut and the load applied to the rod-shaped member 6 in excess of the set value does not act on the load cell 15. Therefore, in the non-operating position, the load applied to the rod-shaped member 6 in excess of the set value does not act on the load cell 15, so that it is possible to prevent a load above a certain level from acting on the load cell 15, and a load cell with fine resolution can be used even for large loads.

[0031] In addition, an adjustment mechanism 28 is provided that adjustably sets the set value. Therefore, the set value can be adjusted freely, so that it can be set to the optimum set value according to the application. In addition, the adjustment mechanism 28 adjusts the fluid pressure. Therefore, the set value can be set by adjusting the fluid pressure, so that the fluid pressure can be easily adjusted over a wide range from high pressure to low pressure.

[0032] FIG. 4 shows another embodiment of the present invention. The same parts as those in the first embodiment are given the same reference numerals and their explanation is omitted, and only the different parts will be explained. The adjustment mechanism 35, which adjustably sets the set value, applies the spring force of the disc spring 36 to the plate-like member 27, and this spring force becomes the set value. A through hole 37 is formed in the horizontal direction at the joint between the first member 131 and the second member 132 that constitute the main body 21 of the punch support member 13. An adjustment member 38 is fitted into the through hole 37 so as to be movable in the horizontal direction, and the adjustment member 38 forms an inclined surface 38A on its lower surface that inclines upward from one side to the other side in the horizontal direction. A disc spring receiver 39, which forms an inclined surface 39A on its upper surface that engages with the inclined surface 38A of the adjustment member 38, is housed in the second member 132 so as to be movable in the vertical direction. The disc spring 36 is interposed between the plate-like member 27 and the disc spring receiver 39.

[0033] Reference numeral 40 denotes a first cover member, which is attached to the first member 131 and the second member 132 and closes one side opening of the through hole 37. Reference numeral 41 denotes a first adjustment bolt, which is screwed into the first cover member 40 so as to be rotatable, and whose tip can abut against one side surface of the adjustment member 38. Reference numeral 42 denotes a first lock nut which is screwed into the first adjustment bolt 41 and abuts against the first cover member 40 to fix the first adjustment bolt 41.

[0034] Reference numeral 43 denotes a second cover member which is attached to the first member 131 and the second member 132 and closes the other opening opposite to the one opening of the through hole 37. Reference numeral 44 denotes a second adjustment bolt which is screwed into the second cover member 43 so as to be rotatable and whose tip can abut against the other side surface opposite to the one side surface of the adjustment member 38. Reference numeral 45 denotes a second lock nut which is screwed into the second adjustment bolt 44 and abuts against the second cover member 43 to fix the second adjustment bolt 44.

[0035] To change the set value, the spring force of the disc spring 36 acting on the plate-like member 27 is changed, making the adjustment possible. That is, the first adjustment bolt 41 is rotated in one direction to move the adjustment member 38 to the right in FIG. 4, thereby moving the disc spring receiver 39 downward in FIG. 4, and the spring force of the disc spring 36 increases. At this time, the second adjustment bolt 44 is separated from the adjustment member 38. Also, the second adjustment bolt 44 is rotated in one direction to move the adjustment member 38 to the left in FIG. 4, thereby moving the disc spring receiver 39 upward in FIG. 4, and the spring force of the disc spring 36 decreases. At this time, the first adjustment bolt 41 is separated from the adjustment member 38.

[0036] In operation, similarly to the first embodiment, the punch support member 13 and the pressure punch 14 move downward together, and the pressure punch 14 comes into contact with the rod-shaped member 6 (shown in FIG. 1) and presses in the distorted portion. At this time, the pressing load is applied from the piston rod 17 through the first member 131 of the punch support member 13, the adjustment member 38, the disc spring receiver 39, the disc spring 36, the plate-shaped member 27, the load cell 15, and the stepped member 23 by the pressure punch 14.

[0037] A reaction force of the load applied to the rod-shaped member 6 acts on the load cell 15 via the pressure punch 14 and the stepped member 23, and detects the load applied to the rod-shaped member 6. Upon detection of this, straightening of the rod-shaped member 6 begins.

[0038] When this correction begins, the load applied to the rod-shaped member 6 is below a set value determined by the spring force of the disc spring 36, and the punch support member 13 and the pressure punch 14 are positioned in their operating positions with their contact portions 33, 34 (shown in Figure 3) spaced apart from each other.

[0039] In this state, when the load applied to the rod-shaped member 6 increases and exceeds the set value determined by the spring force of the disc spring 36, the punch support member 13 moves downward and the abutment portion 33 abuts against the abutment portion 34 of the pressure punch 14, and the punch support member 13 and the pressure punch 14 enter their non-operating positions.

[0040] When the punch support member 13 and the pressure punch 14 are in the non-acting position, the load for pressing the distorted portion of the rod-shaped member 6 is applied from the piston rod 17 to the pressure punch 14 via the first member 131 and second member 132 of the punch support member 13, the two abutting contact portions 33 and 34, and the stepped member 23. At this time, the reaction force of the load applied to the rod-shaped member 6 acts on the second member 132 of the punch support member 13 from the pressure punch 14 via the stepped member 23 and the two abutting contact portions 33 and 34, and does not act on the load cell 15.

[0041] In this operation, similarly to the first embodiment, the punch support member 13 and the pressure punch 14 have an operating position where the contact portions 33, 34 are separated and the load applied to the rod-shaped member 6 acts on the load cell 15, and a non-operating position where the contact portions 33, 34 are in contact and a load applied to the rod-shaped member 6 that exceeds a set value does not act on the load cell 15. Therefore, in the non-operating position, a load that exceeds the set value and is applied to the rod-shaped member 6 does not act on the load cell 15, so that a load above a certain value for the load cell 15 can be prevented from acting, and a load cell with fine resolution can be used even for large loads.

[0042] As in the first embodiment, an adjustment mechanism 35 is provided to adjustably set the set value. Therefore, the set value can be adjusted to an optimum set value according to the application. The adjustment mechanism 35 also adjusts the spring force of the disc spring 36. Therefore, the set value can be set by adjusting the spring force, and the spring force does not require a pressure source and can be easily provided.

[0043] FIG. 5 shows a modified example of the other embodiment. The same parts as those in the other embodiment are given the same reference numerals and their explanation is omitted, and only the different parts will be explained. The adjustment mechanism 35A, which adjustably sets the set value, has a disc spring 36A that applies a spring force to the plate-like member 27 housed in a through hole 37A and interposed between the rear of the adjustment member 381 and a first adjustment bolt 41A. The first adjustment bolt 41A is screwed into the first cover member 40A so as to be rotatable in one direction and the other direction, and has a flange portion 41B formed at its tip to receive the disc spring 36A. The second cover member 43A closes the other side opening of the through hole 37A. The adjustment member 381 forms an inclined surface 381A that inclines upward from one side to the other side in the horizontal direction.

[0044] Reference numeral 46 denotes a rod interposed between the plate-like member 27 and the adjustment member 381, which is fitted into the second member 132B of the punch support member 13 so as to be movable in the vertical direction, with its lower surface abutting the plate-like member 27 and its upper surface forming an inclined surface 46A that engages with the inclined surface 381A of the adjustment member 381.

[0045] To change the set value, the first adjustment bolt 41A is rotated in one direction, causing the flange 41B to increase the compression of the disc spring 36 and increase the spring force. Conversely, the first adjustment bolt 41A is rotated in the other direction, causing the flange 41B to decrease the compression of the disc spring 36 and decrease the spring force.

[0046] In operation, similarly to the other embodiments, the punch support member 13 and the pressure punch 14 move downward together, and the pressure punch 14 comes into contact with the rod-shaped member 6 (shown in FIG. 1) and presses in the distorted portion. At this time, the pressing load is applied from the pressure punch 14 via the piston rod 17 to the first member 131A of the punch support member 13, the adjustment member 381 biased by the disc spring 36A, the rod 46, the plate-shaped member 27, the load cell 15, and the stepped member 23.

[0047] A reaction force of the load applied to the rod-shaped member 6 acts on the load cell 15 via the pressure punch 14 and the stepped member 23, and detects the load applied to the rod-shaped member 6. Upon detection of this, straightening of the rod-shaped member 6 begins.

[0048] When this correction begins, the load applied to the rod-shaped member 6 is below a set value determined by the spring force of the disc spring 36A, and the punch support member 13 and the pressure punch 14 are positioned in their operating positions with their contact portions 33, 34 (shown in Figure 3) spaced apart from each other.

[0049] In this state, when the load applied to the rod-shaped member 6 increases and exceeds the set value determined by the spring force of the disc spring 36A, the punch support member 13 moves downward and the abutment portion 33 abuts against the abutment portion 34 of the pressure punch 14, and the punch support member 13 and the pressure punch 14 are placed in a non-operating position.

[0050] When the punch support member 13 and the pressure punch 14 are in the non-acting position, the load for pressing the distorted portion of the rod-shaped member 6 is applied from the piston rod 17 to the pressure punch 14 via the first member 131A and second member 132B of the punch support member 13, the two abutting contact portions 33 and 34, and the stepped member 23. At this time, the reaction force of the load applied to the rod-shaped member 6 acts on the second member 132B of the punch support member 13 from the pressure punch 14 via the stepped member 23 and the two abutting contact portions 33 and 34, and does not act on the load cell 15.

[0051] In this operation, similarly to the other embodiments, the punch support member 13 and the pressure punch 14 have an operating position where the contact portions 33, 34 are separated and the load applied to the rod-shaped member 6 acts on the load cell 15, and a non-operating position where the contact portions 33, 34 are in contact and a load applied to the rod-shaped member 6 that exceeds a set value does not act on the load cell 15. Therefore, in the non-operating position, a load that exceeds the set value and is applied to the rod-shaped member 6 does not act on the load cell 15, so it is possible to prevent a load above a certain value from acting on the load cell 15, and a load cell with fine resolution can be used even for large loads.

[0052] As in the other embodiments, an adjustment mechanism 35A is provided that adjustably sets the set value. Therefore, the set value can be adjusted to an optimum set value according to the application. The adjustment mechanism 35A also adjusts the spring force of the disc spring 36A. Therefore, the set value can be set by adjusting the spring force, and the spring force does not require a pressure source and can be easily provided.

[0053] In the above embodiment, the adjustment mechanisms 28, 35, and 35A are provided to adjust the set values, but the set values ​​may be fixed and no adjustment mechanisms may be provided. Also, the pressure punch device 8 is used in the distortion correction device 1, but it is of course possible to use it in other devices. [Explanation of symbols]

[0054] 6: Rod-shaped part (target object) 8: Pressure punch device 13: Punch support member 14: Pressure punch 15: Load cell 33, 34: Contact part

Claims

1. a pressure punch device comprising: a punch support member which is movable vertically by a lifting means; a pressure punch which is provided at the tip of the punch support member and which applies a load to an object; and a load cell which is arranged between the punch support member and the pressure punch and which detects the load applied to the object, wherein the pressure punch and the load cell are arranged so as to be movable vertically relative to the punch support member, the punch support member and the pressure punch are provided with abutment portions which separate from each other when the load applied to the object is equal to or less than a set value and which abut against each other when the load exceeds the set value, and the punch support member and the pressure punch have an operating position where both abutment portions are separated and the load applied to the object acts on the load cell, and a non-operating position where both abutment portions abut and the load applied to the object in excess of the set value does not act on the load cell.

2. 2. The pressure punch device according to claim 1, further comprising an adjustment mechanism for freely adjusting the set value.

3. 3. The pressure punch device according to claim 2, wherein the adjustment mechanism is capable of freely adjusting the fluid pressure.

4. 3. The pressure punch device according to claim 2, wherein the adjustment mechanism is capable of freely adjusting a spring force.

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