Die for peeling plate protecion sheet

Abstract

To provide a die for peeling a plate protection sheet which can prevent scratches on a plate surface when a slit for peeling is made in the plate protection sheet.SOLUTION: A die 10 for peeling of a plate protection sheet includes: a punch guide 20 including a cylindrical body 20a and a bottom holder 25 which is detachably attached to an end of the body 20a; a punch body 30 which is disposed movably in an axial direction along a cylindrical axis 23 of the punch guide 20 in the punch guide 20; and a tool holder 34 to which a sheet peeling tool 40 is attached. The tool holder 34 is configured to convert linear motion along the axial direction of the punch body 30 into rotational motion to rotate around a rotation axis set to the cylindrical axis 23 of the punch guide 20.SELECTED DRAWING: Figure 1A

Description

Technical Field

[0001] The present invention relates to a die for peeling a sheet material protection sheet.

Background Art

[0002] Conventionally, as a cutting die for a sheet material protection sheet that can be mounted on a turret punch press, the cutting die for a sheet material protection sheet of Patent Document 1 is known. This cutting die includes an upper die detachably provided with a cutting blade such that the cutting edge faces downward at the lower end, and a lower die having a flat upper surface. According to this cutting die, it is said that a cut operation can be performed in advance at a desired location on the protection sheet attached to the surface of the sheet material by cutting the protection sheet attached to the surface of the sheet material with the cutting blade.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in such a cutting die, when making a cut for peeling the protection sheet, the contact area between the cutting blade and the protection sheet on the sheet material becomes narrow, so there is a risk that the pressure will concentrate on the contact point during the cut operation and the sheet material will be damaged. Also, even if a cut can be made, there is a risk that the protection sheet will remain adhered to the surface of the sheet material and the peeling operation will become difficult.

Means for Solving the Problems

[0005] The die for peeling a sheet material protection sheet according to one aspect of one or more embodiments includes a punch guide having a cylindrical main body portion and a bottom holder detachably attached to an end of the main body portion, a punch body movably disposed axially along the cylindrical axis of the punch guide inside the punch guide, and a tool holder to which a sheet peeling tool is attached. The tool holder is configured to rotate about the cylindrical axis of the punch guide by converting the linear motion of the punch body along the axial direction into a rotational motion.

[0006] According to the die for peeling a sheet material protection sheet according to one or more embodiments, the sheet peeling tool enters the protection sheet and peels the protection sheet as the tool holder rotates. Since a part of the peeled protection sheet is not in close contact with the material surface, subsequent manual peeling of the protection sheet becomes easier. Furthermore, it is possible to prevent damage to the surface of the sheet material during the process of peeling the protection sheet.

Brief Description of the Drawings

[0007]

Figure 1A

Figure 1B

Figure 2

Figure 3

Figure 4A

Figure 4B

Figure 5A

Figure 5B

Figure 6

Figure 7

Figure 8

Figure 9A

Figure 9B

Figure 10A

Figure 10B

DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, the die for peeling the sheet material protection sheet of the present embodiment will be described with reference to the drawings. Note that the same or similar reference numerals are given to the same functions and configurations, and the description thereof will be omitted as appropriate.

[0009] As shown in FIG. 3, the die 10 for peeling the sheet material protection sheet according to the present embodiment is a die for peeling a sheet attached to the surface of the workpiece W in order to protect the plate-shaped workpiece W from the workpiece W. The die 10 for peeling the sheet material protection sheet is detachably and vertically movably supported with respect to an upper die holder 1 such as an upper turret in a punch press such as a turret punch press (not shown).

[0010] In the present embodiment, the vertical movement means, as shown in FIG. 3, the vertical movement in the vertical direction that is pressed in a state where the die is mounted on the upper die holder 1. Also, descriptions such as the upward direction and the downward direction are similarly the upper and lower directions in the vertical direction in the die mounted on the upper die holder 1.

[0011] The die 10 for peeling the sheet material protection sheet according to the embodiment includes a substantially cylindrical punch guide 20, a punch body 30, and a tool holder 34 to which a sheet peeling tool 40 is attached. A part of the punch body 30 is disposed inside the punch guide 20, and the punch body 30 is configured to be movable along the axial direction of the cylindrical axis 23 of the punch guide 20. The tool holder 34 is configured to rotate about the cylindrical axis 23 of the punch guide 20 by converting the linear motion of the punch body 30 along the axial direction of the cylindrical axis 23 of the punch guide 20 of the punch body 30 into a rotational motion.

[0012] The punch guide 20 is mainly slidably supported in the punch mounting hole 2 of the upper die holder 1 so as to be vertically movable. The punch guide 20 includes a cylindrical main body portion 20a and a bottom holder 25 detachably attached to an end of the main body portion 20a.

[0013] The main body portion 20a is a cylindrical member having an inner peripheral surface with a diameter that allows the punch body 30 to move freely. At the end of the main body portion 20a, a flange portion 21 that extends radially outward is provided. The flange portion 21 constitutes one end portion of the punch guide 20.

[0014] In a state where it is mounted in the punch mounting hole 2 provided in the upper die holder 1, the flange portion 21 of the punch guide 20 is supported in a state of being constantly biased upward by a plurality of lifter springs 3 provided on the upper surface 1a of the upper die holder 1. Therefore, a part of the die 10 for peeling the sheet protection sheet is always lifted with respect to the upper surface 1a of the upper die holder 1 by the action of the plurality of lifter springs 3 on the punch guide 20.

[0015] As shown in Fig. 1A, the bottom holder 25 is a member that constitutes the end portion 22 of the punch guide 20. This end portion 22 corresponds to the other end portion of the punch guide 20, which is on the side opposite to the flange portion 21. The bottom holder 25 of the punch guide 20 is a separate part from the main body portion 20a of the punch guide 20. The bottom holder 25 is detachably attached to the tip side (lower end side) of the main body portion 20a with bolts or the like.

[0016] The bottom holder 25 is a bottomed cylindrical member having an inner peripheral surface with a diameter that allows the tip portion of the tool holder 34 (specifically, a part of the tool holding portion 33 described later) to enter. A through hole through which the sheet peeling tool 40 can be inserted is formed at the center of the bottom of the bottom holder 25.

[0017] The punch body 30 includes a first member 31 and a punch driver 314. The first member 31 is configured to be movable in the axial direction along the cylindrical axis 23 of the punch guide 20.

[0018] As shown in Fig. 2, the first member 31 has a bottomed cylindrical shape including a cylindrical portion 31a having a cylindrical shape and a bottom portion 31b provided at an axial end of the cylindrical portion 31a. The first member 31 is arranged such that the bottom portion 31b faces upward. The bottom portion 31b includes an end portion (upper end portion) of the first member 31, and a cam surface 312 is formed on the lower end surface of the cylindrical portion 31a of the first member 31.

[0019] As shown in Fig. 1A, the diameter of the outer peripheral surface 311 of the first member 31 is slightly smaller than the diameter of the inner peripheral surface 24 of the punch guide 20. The first member 31 is arranged inside the punch guide 20 and is configured to be movable axially along the cylindrical axis 23 of the punch guide 20.

[0020] The first member 31 includes a cam surface 312 that protrudes axially along the cylindrical axis 313 of the first member 31 and extends along the circumferential direction on the end surface of the cylindrical portion 31a.

[0021] The cam surface 312 is an inclined surface inclined at a predetermined inclination angle with respect to a plane perpendicular to the cylindrical axis 313 of the first member 31 at each circumferential position. In the present embodiment, the predetermined inclination angle of the cam surface 312 is a constant inclination angle.

[0022] The bottom portion 31b of the first member 31 is connected to the punch driver 314. A through hole through which a bolt for fixing the punch driver 314 to the first member 31 can be inserted may be formed in the bottom portion 31b (see Fig. 2).

[0023] Also, a gap may be formed between the first member 31 and the punch driver 314 such that the first member 31 is slightly elastically deformable with respect to the punch driver 314 in a state where the first member 31 and the punch driver 314 are connected. This gap may be formed, for example, by designing the relationship between the length of the bolt used for connection and the depth of the screw hole formed in the punch driver 314 so that the gap is formed.

[0024] Even when the punch driver 314 is disposed inside the punch guide 20, the punch driver 314 protrudes above the punch guide 20. A head nut 315 is fixed as a punch head to the outer peripheral portion of the end of the punch driver 314. Note that the punch head may be fixed to the outer peripheral portion of the punch driver 314 by means such as screwing a screw portion formed at the end of the punch driver 314 into a screw hole formed in the head nut 315.

[0025] A ring-shaped first spring seat 316 is provided on the outer periphery of the punch driver 314 on the side where the head nut 315 is fixed. A ring-shaped second spring seat 317 having a flange shape on the lower surface side is attached to the flange portion 21 of the punch guide 20. A powerful stripper spring 318 is provided in a compressed state between these spring seats 316 and 317. Further, the stripper spring 318 has a biasing force larger than that of the plurality of lifter springs 3 described above.

[0026] The tool holder 34 includes a second member 32 having a cylindrical portion 321 and a tool holding portion 33 configured to be able to mount the sheet peeling tool 40. The tool holding portion 33 is attached to the second member 32 while holding the sheet peeling tool 40 and is configured to rotate integrally with the rotation of the second member 32.

[0027] As shown in FIG. 5A, the sheet peeling tool 40 is held in a state where the tip 41 of the sheet peeling tool 40 protrudes a predetermined amount L1 from the end 22 of the punch guide 20 with the sheet peeling tool 40 mounted on the tool holding portion 33. In the present embodiment, the end 22 of the punch guide 20 serving as a reference for the predetermined amount L1 is a bottom surface formed in a planar shape on the side facing the workpiece W at the bottom of the bottom holder 25 provided in the punch guide 20. As described above, since the bottom holder 25 of the punch guide 20 is configured as a component separate from the main body portion 20a of the punch guide 20, the workability when setting the tip 41 of the sheet peeling tool 40 to protrude a predetermined amount L1 with respect to the end 22 of the punch guide 20 can be improved.

[0028] In this embodiment, as shown in FIG. 2, the second member 32 has a cylindrical portion 321 having a cylindrical shape. Specifically, the second member 32 has a bottomed cylindrical shape including the cylindrical portion 321 and a bottom portion 32b provided at an axial end of the cylindrical portion 321. The second member 32 is arranged such that the bottom portion 32b faces downward. As shown in FIG. 1A, the diameter of the outer peripheral surface 324 of the second member 32 is slightly smaller than the diameter of the inner peripheral surface 24 of the punch guide 20.

[0029] As shown in FIG. 2, the end surface of the cylindrical portion 321 of the second member 32 faces the end surface of the cylindrical portion 31a of the first member 31 in the direction of the cylindrical axis 23 when disposed inside the punch guide 20. A long oval-shaped through hole 326 is formed at the center of the bottom portion 32b of the second member 32. A fixing member insertion hole 327 penetrating from the outer peripheral surface 324 to the through hole 326 is formed in the bottom portion 32b of the second member 32. Note that the fixing member insertion hole 327 is formed so as to allow insertion of a fixing member, such as a set screw or the like, for fixing the tool holding portion 33 described later.

[0030] In this embodiment, an abutting portion 325 that slidably abuts against the cam surface 312 is provided on the cylindrical portion 321 of the second member 32.

[0031] As shown in FIG. 1A, the second member 32 is supported by the tool holding portion 33 and is configured to be rotatable about the cylindrical axis 23 of the punch guide 20. The second member 32 is configured to rotate about the cylindrical axis 23 of the punch guide 20 by converting the linear motion of the first member 31 along the axial direction of the cylindrical axis 23 of the punch guide 20 into a rotational motion. Specifically, the first member 31 of the punch body 30 and the second member 32 of the tool holder 34 constitute a spatial cam mechanism in which the linear motion of the first member 31 is converted into the rotational motion of the second member 32 by the abutting portion 325 sliding on the cam surface 312.

[0032] In the present embodiment, the contact portion 325 is formed by an inclined surface that extends along the circumferential direction of the cylindrical shape and is inclined with respect to a plane perpendicular to the cylindrical axis 323 of the second member 32 at each circumferential position.

[0033] As shown in FIG. 1A, the tool holding portion 33 is configured to be able to mount the sheet peeling tool 40, and is connected to the second member 32 in a state where a part thereof is inserted through a through hole 326 formed in the bottom portion 32b of the second member 32. Therefore, the tool holding portion 33 is configured to rotate integrally with the cylindrical portion 321 when the second member 32 rotates.

[0034] A thrust bearing 26 for receiving a force acting in the direction of the cylindrical axis 23 with respect to the tool holding portion 33 is provided between the tool holding portion 33 and the bottom holder 25 of the punch guide 20. According to this configuration, the tool holder 34, that is, the tool holding portion 33 and the second member 32, can be smoothly rotated with respect to the punch guide 20.

[0035] As shown in FIG. 5A, the tool holding portion 33 includes a large-diameter portion 333 formed with an outer diameter the same as the outer diameter of the cylindrical portion 321 of the second member 32, and a boss portion 334 provided so as to protrude from the large-diameter portion 333. The root portion of the boss portion 334 is formed in an oval shape. Therefore, the boss portion 334 can be inserted into the through hole 326 of the second member 32. The tool holding portion 33 is integrated with the second member 32 by fixing the boss portion 334 to the bottom portion 32b of the second member 32 with a fixing member (for example, a set screw or the like) inserted from the fixing metal fitting insertion hole 327.

[0036] A through hole 332 through which the sheet peeling tool 40 can be inserted, penetrating the large-diameter portion 333 and the boss portion 334, is formed in the tool holding portion 33. The through hole 332 of the tool holding portion 33 is formed such that the sheet peeling tool 40 mounted on the tool holding portion 33 is disposed at the central portion including the cylindrical axis 323 of the cylindrical portion 321 of the second member 32 in a state where the tool holding portion 33 is connected to the second member 32.

[0037] The through hole 332 is a tapered hole 335 that is formed on the tip side of the boss portion 334 and has a diameter that increases toward the tip of the boss portion 334. When the tool holding portion 33 is connected to the second member 32 and disposed inside the punch guide 20 together with the first member 31, a space is provided above the tip of the boss portion 334 of the tool holding portion 33 where the base end portion of the sheet peeling tool 40 as shown in FIG. 1A, for example, can protrude. With the configuration of providing the space, the protruding amount of the sheet peeling tool 40 inserted through the through hole 332 with respect to the end portion 22 of the punch guide 20 can be adjusted.

[0038] As shown in FIG. 5A, a collet 336 composed of a plurality of split pieces that are split by a plurality of split grooves (not shown) whose outer peripheral surfaces are formed in a tapered shape and face the tip side or the rear end side is detachably attached to the tapered hole 335. The sheet peeling tool 40 is inserted through the collet 336 and the through hole 332, and is configured such that its base end portion is located in the space as shown in FIGS. 1A and 3.

[0039] A ring-shaped cap 337 for pressing the collet 336 into the tapered hole 335 is detachably attached to the tip portion of the boss portion 334. When the cap 337 is pushed in, the collet 336 is pressed downward, so that the split pieces of the collet 336 are tightened by the tapered hole 335 and the sheet peeling tool 40 is firmly fixed to the tool holding portion 33.

[0040] The sheet peeling tool 40 only needs to be a tool that can penetrate the cutting edge into the protective sheet when pressed against the protective sheet through the peeling die 10 and can break the protective sheet as the tool holder 34, that is, the second member 32 and the tool holding portion 33 rotate.

[0041] The number of cutting blades provided on the sheet peeling tool 40 may be two from the viewpoint of making it easier for the operator to pick up a plurality of peeling pieces that serve as the starting point of peeling formed on the protective sheet while having a plurality of peeling pieces due to the rotation of the tool holding portion 33. Also, from the same viewpoint, in the present embodiment, the rotation of the second member 32 is configured such that the rotation angle is a predetermined rotation amount less than 180 degrees with respect to the cylindrical axis 23 of the punch guide 20. For example, with respect to the maximum descending amount of the striker 8 of the punch press, the second member 32 may be set to be rotatable up to 150 degrees at most, and the rotation amount of the second member 32 may be adjustable according to the actual descending amount of the striker 8.

[0042] As shown in FIGS. 1A and 1B of the present embodiment, an elastic member 50 is disposed inside the punch guide 20, specifically, the bottom holder 25. The elastic member 50 is arranged such that the tool holding portion 33 is biased in the circumferential direction of the punch guide 20 (the circumferential direction when the cylindrical axis 23 is the rotation axis) by the biasing force of the elastic member 50. That is, when the first member 31 moves from the side of one end portion of the punch guide 20 (the side where the flange portion 21 is provided) toward the side of the other end portion, for example, in the process from the state shown in FIG. 4A to the state shown in FIG. 4B, the tool holding portion 33 is configured to rotate against the biasing force of the elastic member 50 via the second member 32. The elastic member 50 only needs to be able to rotate the tool holding portion 33 to the position (rotation angle) before the start of rotation as the first member 31 moves toward the side of one end portion due to the biasing force of the elastic member 50.

[0043] Specifically, the elastic member 50 is one or more coil springs in the present embodiment. As shown in FIG. 1B, concave groove portions for disposing the elastic member 50 are respectively formed on the outer peripheral surface of the large-diameter portion 333 of the tool holding portion 33 and the inner peripheral surface of the bottom holder 25 of the punch guide 20. One end of the elastic member 50 abuts against a screw 51 disposed inside the punch guide 20 recessed from the inner peripheral surface of the punch guide 20, and the other end of the elastic member 50 abuts against an end portion 333a of a groove portion formed on the outer peripheral surface of the large-diameter portion 333 of the tool holding portion 33. With such a configuration, the elastic member 50 biases the tool holding portion 33 in the circumferential direction of the punch guide 20.

[0044] (Operation of the Die 10 for Peeling the Sheet Material Protection Sheet in the Peeling Process of the Protection Sheet) When the die 10 for peeling the sheet material protection sheet with the above configuration is mounted on a punch press and used, as shown in FIG. 3, the die 10 for peeling the sheet material protection sheet is mounted on the upper die holder 1 of the punch press. Next, the plate-shaped workpiece W is placed and positioned between the die 10 for peeling the sheet material protection sheet and the lower die 60 mounted on the lower die holder 4. At this time, the plate-shaped workpiece W is placed so that the protection sheet is on the side of the die 10 for peeling.

[0045] The head nut 315 is pressed by the striker 8 of the punch press. Since the biasing force of the lifter spring 3 is weaker than the biasing force of the stripper spring 318, the punch body 30 and the punch guide 20 both descend against the biasing force of the lifter spring 3. The workpiece W is sandwiched between the end 22 of the lowered punch guide 20 and the upper surface of the lower die 60. As the punch body 30 and the punch guide 20 descend, the cutting edge of the tip 41 of the sheet peeling tool 40 that protrudes a predetermined amount L1 from the end 22 of the punch guide 20 enters the protection sheet that protects the surface of the workpiece W. The protruding amount of the tip 41 of the sheet peeling tool 40 with respect to the end 22 of the punch guide 20 is adjusted to a predetermined amount L1 that does not damage the surface of the workpiece W by penetrating the protection sheet in advance, considering the thickness of the target protection sheet and the like.

[0046] When the striker 8 further lowers the head nut 315 against the biasing force of the stripper spring 318, as shown in FIGS. 3 and 1A, the first member 31 of the punch body 30 descends along the cylindrical axis 23 of the punch guide 20 inside the punch guide 20. This downward movement of the first member 31 transmits a force to the contact portion 325 of the second member 32 of the tool holder 34 that contacts the cam surface 312 of the first member 31, as shown in FIGS. 4A and 4B, to rotate the second member 32. That is, the linear motion of the first member 31 is converted into the rotational motion of the second member 32. At this time, the cutting edge of the tip 41 of the sheet peeling tool 40 in the state of entering the protective sheet of the workpiece W rotates together with the tool holding portion 33 that rotates with the rotation of the second member 32 without descending. With the rotation of the sheet peeling tool 40, the protective sheet on the workpiece W is torn without damaging the surface of the workpiece W.

[0047] (Regarding a jig for adjusting the protruding amount of the tip 41 of the sheet peeling tool 40 with respect to the end portion 22 of the punch guide 20) When attaching the sheet peeling tool 40 to the tool holding portion 33, a jig 9 as shown in FIGS. 5A and 5B may be used. Specifically, the jig 9 has a bottomed cylindrical shape, and the inner diameter thereof is set to be slightly larger than the outer diameter of the bottom holder 25 of the punch guide 20. With this configuration, the jig 9 can insert the bottom holder 25 until at least the tip on the end portion 22 side of the bottom holder 25 contacts the bottom surface thereof. A hole having a diameter slightly larger than the through hole formed in the center of the bottom of the bottom holder 25 is formed in the central portion of the jig 9, and a shim 9a can be disposed inside the hole. Note that the jig 9 may be disposed and used on a flat plate-shaped base B.

[0048] (Regarding a method for setting the protruding amount of the tip 41 of the sheet peeling tool 40 with respect to the end portion 22 of the punch guide 20) When setting the protruding amount of the tip 41 of the sheet peeling tool 40 with respect to the end 22 of the punch guide 20 by the jig 9, first, as shown in FIG. 5A, the jig 9 is placed on the base B, and a shim 9a is placed in the hole at the center of the bottom of the jig 9. At this time, the shim 9a is selected so that the step formed between the bottom surface of the jig 9 and the upper surface of the shim 9a is a step of a predetermined amount L1 considering the thickness of the protective sheet to be peeled. The tool holder 33 with the cap 337 for fixing the sheet peeling tool 40 to the tool holding portion 33 loosened is inserted into the bottom holder 25 removed from the tip of the main body portion 20a of the punch guide 20. At this time, as shown in FIG. 5A, the tool holder 33 may be inserted into the bottom holder 25 while being connected to the second member 32. The bottom holder 25 with the tool holder 33 inserted therein is placed in the jig 9. At this time, the sheet peeling tool 40 temporarily held with the cap 337 loosened is slidable with respect to the tool holding portion 33. Therefore, when the tip 41 of the sheet peeling tool 40 is brought into contact with the shim 9a with the end 22 of the bottom holder 25 in contact with the bottom surface of the jig 9, the tip 41 of the sheet peeling tool 40 can be made to protrude by a predetermined amount L1 with respect to the end 22 of the bottom holder 25. In this state, by tightening the cap 337, the sheet peeling tool 40 can be fixed to the tool holding portion 33 with the tip 41 protruding by a predetermined amount L1 with respect to the end 22 of the bottom holder 25.

[0049] (Function and Effect) The die 10 for peeling the plate material protection sheet according to the present embodiment is configured to be able to convert the linear motion along the axial direction of the cylindrical shaft 23 of the punch guide 20 of the first member 31 into a rotational motion that rotates about the cylindrical shaft 23 of the punch guide 20 of the second member 32 of the tool holder 34. Further, the tool holding portion 33 to which the sheet peeling tool 40 is attached is configured to rotate as the second member 32 rotates.

[0050] With this configuration, when the head nut 315 of the punch driver 314 is pressed by the striker 8, as the first member 31 descends, the sheet peeling tool 40 attached to the tool holder 33 rotates. The tip 41 of the sheet peeling tool 40 enters the protective sheet when the end 22 of the punch guide 20 abuts against the protective sheet of the workpiece W, and then only performs a rotational movement. Since the tip of the rotating sheet peeling tool comes into contact with a wide range, the pressing force is dispersed, and it is possible to prevent the surface of the workpiece (plate material) W from being damaged. Therefore, even when peeling a protective sheet with high adhesiveness and difficult to peel from the workpiece W, it is possible to prevent the surface of the workpiece (plate material) W from being damaged. Further, since the sheet peeling tool 40 rotates, the protective sheet can be efficiently broken, so the tip 41 of the sheet peeling tool 40 does not have to enter the protective sheet excessively, and there is no risk of damaging the surface of the workpiece (plate material) W.

[0051] Furthermore, in the die 10 for peeling the plate material protective sheet according to the present embodiment, the first member 31 of the punch body 30 and the second member 32 of the tool holder 34 mechanically convert the movement. Therefore, according to the die 10 for peeling the plate material protective sheet, the relationship between the movement amount of the first member 31 and the rotation amount of the second member 32 can be set according to the mechanical structure of the first member 31 and the second member 32. Thereby, it is possible to easily ensure the rotation amount of the sheet peeling tool 40 that is optimal for peeling the protective sheet. Further, the rotation amount of the sheet peeling tool 40, that is, the mode of the peeled portion of the protective sheet can be adjusted by changing the descending amount of the striker 8. In addition, since the sheet peeling tool 40 is rotated by the cam mechanism, a configuration that does not require wiring of a motor or the like is provided, and a configuration that can achieve energy saving and miniaturization is provided.

[0052] An elastic member 50 is disposed inside a bottom holder 25 of a punch guide 20. Due to the biasing force of the elastic member 50 on the tool holder 34, the tool holding portion 33 and the second member 32 can be returned to a position before the first member 31 is pressed. According to the die 10 for peeling a plate material protection sheet provided with the elastic member 50 inside the bottom holder 25, the process of peeling the protection sheet can be easily repeated.

[0053] Also, each of the first member 31 and the second member 32 of the die 10 for peeling a plate material protection sheet has cylindrical portions 31a, 321. Further, in a state of being disposed inside the punch guide 20, the end surface of the cylindrical portion 31a of the first member 31 and the end surface of the cylindrical portion 321 of the second member 32 face each other in the axial direction of the cylindrical axis 23 of the punch guide 20. Further, a cam surface 312 is provided on the end surface of the cylindrical portion 31a of the first member 31, and a contact portion 325 that slidably contacts the cam surface 312 is provided on the cylindrical portion 321 of the second member 32.

[0054] With such a configuration, a spatial cam mechanism that can be disposed inside the punch guide 20 can be configured with a simple structure.

[0055] Also, the cam surface 312 of the first member 31 and the contact portion 325 of the second member 32 are each formed by an inclined surface. In this case, since a wide contact area between the cam surface 312 and the contact portion 325 can be ensured, the die 10 for peeling with higher durability can be obtained.

[0056] In addition, in this embodiment, a bottom holder 25 detachably attached to the main body portion 20a of the punch guide 20 constitutes the end portion 22 of the punch guide 20. Therefore, it is possible to easily fix the sheet peeling tool 40 and adjust the protruding amount of the tip of the sheet peeling tool 40 with respect to the end portion 22 of the punch guide 20. Furthermore, the operation of disposing the elastic member 50 inside the punch guide 20 can be easily performed. Also, when adjusting the protruding amount of the sheet peeling tool 40, the protruding amount L1 of the tip 41 of the rotating sheet peeling tool 40 is precisely adjusted by the jig 9 shown in FIG. 5B so as not to exceed the thickness of the plate material protection sheet. By adopting the step of precisely adjusting the protruding amount L1 of the sheet peeling tool 40 with the jig 9, the effect of preventing damage to the surface of the plate-shaped workpiece W in the process of peeling the plate material protection sheet can be further enhanced.

[0057] As described above, the embodiments have been described, but the present invention is not limited to these descriptions, and it is obvious to those skilled in the art that various modifications and improvements are possible.

[0058] Modification Examples 1 to 3 illustrated in FIGS. 6 to 8 shown below show modification examples of the cylindrical portions 321A, 321B, and 321C of the second members 32A, 32B, and 32C of the tool holder 34 in the die 10 for peeling the plate material protection sheet. These modification examples have the same configuration as the die 10 for peeling the plate material protection sheet according to an embodiment, except that the cylindrical portions 321A, 321B, and 321C of the second members 32A, 32B, and 32C are used instead of the cylindrical portion 321 of the second member 32 shown in FIG. 2. Note that the cam surface 312 of the first member 31 used in Modification Examples 1 to 3 may have a predetermined inclination angle that smoothly changes in the circumferential direction of the first member 31, for example, so that the behavior of the rotational movement of the second members 32A, 32B, and 32C is a desired behavior.

[0059] (Modification Example 1) As shown in Fig. 6, a plurality of contact portions 325A are provided on the cylindrical portion 321A of the second member 32A according to the first modification example. Each contact portion 325A is provided in a columnar shape on the end face of the cylindrical portion 321A. Further, at least the edge portion along the circumferential direction of the tip surface 325Aa of each contact portion 325A is formed in a curved surface shape. According to this first modification example, the tip surfaces 325Aa of the plurality of contact portions 325A respectively come into contact with the cam surface 312 of the first member 31. By the sliding of the tip surfaces 325Aa of the respective contact portions 325A, the linear motion of the first member 31 is converted into the rotational motion of the second member 32A.

[0060] (Second modification example) As shown in Fig. 7, a plurality of contact portions 325B are provided on the cylindrical portion 321B of the second member 32B according to the second modification example. Each contact portion 325B is provided in a columnar shape on the end face of the cylindrical portion 321B. The tip surface 325Ba of the contact portion 325B is formed in a spherical shape. According to this second modification example, the tip surfaces 325Ba of the plurality of contact portions 325B respectively come into contact with the cam surface 312 of the first member 31. By the sliding of the tip surfaces 325Ba of the respective contact portions 325B, the linear motion of the first member 31 is converted into the rotational motion of the second member 32B.

[0061] (Third modification example) As shown in Fig. 8, a plurality of contact portions 325C are provided on the cylindrical portion 321C of the second member 32C according to the third modification example. Each contact portion 325C is provided in a columnar shape on the end face of the cylindrical portion 321C and has a roller 325Ca at its tip, the rotational axis direction of which is the radial direction of the cylindrical portion 321C. According to this third modification example, the rollers 325Ca that the plurality of contact portions 325C have at their tips respectively come into contact with the cam surface 312 of the first member 31. By the rotation of the rollers 325Ca of the respective contact portions 325C while contacting the cam surface 312, the linear motion of the first member 31 is converted into the rotational motion of the second member 32C.

[0062] According to the configurations of the second members 32A to 32C according to Modification Examples 1 to 3, the contact area with the cam surface 312 of the first member 31 is smaller than that of the second member 32 according to one embodiment, so that the frictional force with the first member 31 can be reduced.

[0063] Modification Examples 4 to 7 illustrated in FIGS. 9A to 10B are modification examples of the combination of the cylindrical portion 31a of the first member of the punch body and the cylindrical portion 321 of the second member of the tool holder of the die 10 for peeling the sheet material protection sheet in one embodiment. Specifically, Modification Example 4 is a modification example in which the punch body is provided with a combination of a first member having a cylindrical portion 31Da shown in FIG. 9A and a second member having a cylindrical portion 321D shown in FIG. 9B. Modification Example 5 is a modification example in which the punch body is provided with a combination of a first member having a cylindrical portion 31Ea shown in FIG. 9B and a second member having a cylindrical portion 321E shown in FIG. 9A. Modification Example 6 is a modification example in which the punch body is provided with a combination of a first member having a cylindrical portion 31Fa shown in FIG. 10B and a second member having a cylindrical portion 321F shown in FIG. 10A. Modification Example 7 is a modification example in which the punch body is provided with a combination of a first member having a cylindrical portion 31Ga shown in FIG. 10A and a second member having a cylindrical portion 321G shown in FIG. 10B. In these modification examples, instead of the cylindrical portion 31a of the first member 31 and the cylindrical portion 321 of the second member 32 shown in one embodiment, the cylindrical portions 31Da, 31Ea, 31Fa, 31Ga of the first member and the cylindrical portions 321D, 321E, 321F, 321G of the second member are used. Except for the configurations of the cylindrical portion of the first member and the cylindrical portion of the second member, these modification examples have the same or similar configurations as the die 10 for peeling the sheet material protection sheet according to one embodiment.

[0064] (Modification Example 4) The outer peripheral surface of the cylindrical portion 31Da of the first member is slidable with respect to the inner peripheral surface 24 of the punch guide 20. A helical slot groove 312D is formed on the inner peripheral surface 318D of the cylindrical portion 31Da of the first member. With the second member disposed inside the punch guide 20, at least a part of the second member is disposed on the inner peripheral surface 318D side of the cylindrical portion 31Da of the first member. A protrusion 325D engageable with the helical slot groove 312D of the first member is formed on the outer peripheral surface 324D of the second member.

[0065] In the configuration of the die 10 for peeling the sheet material protection sheet according to Modification 4, a punch driver 314 is connected to the first member including the cylindrical portion 31Da, and is disposed in the punch guide 20 together with the second member including the cylindrical portion 321D connecting the tool holding portion 33. In Modification 4, the cylindrical portion 321D of the second member is disposed on the inner peripheral surface 318D side of the cylindrical portion 31Da of the first member. Further, the protrusion 325D of the second member is slidably engaged with the helical slot groove 312D of the first member. Then, when, for example, the head nut 315 is pressed, the protrusion 325D slides following the helical slot groove 312D of the first member, so that the linear motion of the first member is configured to be converted into the rotational motion of the second member.

[0066] (Modification 5) The outer peripheral surface of the cylindrical portion 321E of the second member is slidable with respect to the inner peripheral surface 24 of the punch guide 20. A helical slot groove 325E is formed on the inner peripheral surface 328E of the cylindrical portion 321E of the second member. With the first member disposed inside the punch guide 20, at least a part of the first member is disposed on the inner peripheral surface 328E side of the cylindrical portion 321E of the second member. A protrusion 312E engageable with the helical slot groove 325E of the second member is formed on the outer peripheral surface 311E of the first member.

[0067] In the configuration of the die 10 for peeling the sheet material protection sheet according to Modification Example 5, a punch driver 314 is connected to the first member including the cylindrical portion 31Ea, and is disposed in the punch guide 20 together with the second member including the cylindrical portion 321E to which the tool holding portion 33 is connected. In Modification Example 5, the cylindrical portion 31Ea of the first member is disposed on the inner peripheral surface 328E side of the cylindrical portion 321E of the second member. Further, the protrusion 312E of the first member is slidably engaged with the spiral slot groove 325E of the second member. Then, when, for example, the head nut 315 is pressed, the protrusion 312E slides along the spiral slot groove 325E of the second member, so that the linear motion of the first member is configured to be converted into the rotational motion of the second member.

[0068] (Modification Example 6) The outer peripheral surface of the cylindrical portion 31Fa of the first member is slidable with respect to the inner peripheral surface 24 of the punch guide 20. A protrusion 312F is formed on the inner peripheral surface 318F of the cylindrical portion 31Fa of the first member. In a state of being disposed inside the punch guide 20, at least a part of the second member is disposed on the inner peripheral surface 318F side of the cylindrical portion 31Fa of the first member. A spiral slot groove 325F engageable with the protrusion 312F of the first member is formed on the outer peripheral surface 324F of the second member.

[0069] In the configuration of the die 10 for peeling the sheet material protection sheet according to Modification Example 6, a punch driver 314 is connected to the first member including the cylindrical portion 31Fa, and is disposed in the punch guide 20 together with the second member including the cylindrical portion 321F to which the tool holding portion 33 is connected. In Modification Example 6, the cylindrical portion 31Fa of the first member is disposed on the outer peripheral surface 324F side of the cylindrical portion 321F of the second member. Further, the protrusion 312F of the first member is slidably engaged with the spiral slot groove 325F of the second member. Then, when, for example, the head nut 315 is pressed, the protrusion 312F slides along the spiral slot groove 325F of the second member, so that the linear motion of the first member is configured to be converted into the rotational motion of the second member.

[0070] (Modification Example 7) The outer peripheral surface of the cylindrical portion 321G of the second member is slidable with respect to the inner peripheral surface 24 of the punch guide 20. A protrusion 325G is provided on the inner peripheral surface 328G of the cylindrical portion 321G of the second member. In a state where it is disposed inside the punch guide 20, at least a part of the first member is disposed on the inner peripheral surface 328G side of the cylindrical portion 321G of the second member. A spiral slot groove 312G that can engage with the protrusion 325G of the second member is formed on the outer peripheral surface 311G of the first member.

[0071] In the configuration of the die 10 for peeling the sheet material protection sheet according to Modification 7, a punch driver 314 is connected to the first member including the cylindrical portion 31Ga, and is disposed in the punch guide 20 together with the second member including the cylindrical portion 321G to which the tool holding portion 33 is connected. In Modification 7, the cylindrical portion 321G of the second member is disposed on the outer peripheral surface 311G side of the cylindrical portion 31Ga of the first member. Further, the protrusion 325G of the second member is slidably engaged with the spiral slot groove 312G of the first member. Then, for example, when the head nut 315 is pressed, the protrusion 325G slides following the spiral slot groove 312G of the first member, so that the linear motion of the first member is configured to be converted into the rotational motion of the second member.

[0072] In the configurations of the cylindrical portions 31Da, 31Ea, 31Fa, 31Ga of the first member and the cylindrical portions 321D, 321E, 321F, 321G of the second member according to Modifications 4 to 7, the cylindrical portions 321D, 321E, 321F, 321G of the second member and the cylindrical portions 31Da, 31Ea, 31Fa, 31Ga of the first member can function as positive cams that can regulate each other's movement. Therefore, according to these Modifications 4 to 7, the occurrence of backlash and the like can be reduced.

[0073] As described above, although the embodiments of the present invention have been described, it should not be understood that the discussions and drawings forming a part of this disclosure limit this invention. Various alternative embodiments, examples, and operation techniques will be apparent to those skilled in the art from this disclosure.

Description of Reference Numerals

[0074] 1 Upper mold holder 1a Upper surface 2 Punch mounting hole 3 Lifter spring 4 Lower mold holder 8 Striker 9 Fixture 9a Shim B Base 10 Mold for peeling (sheet material protection sheet) 20 Punch guide 21 Flange part 22 End (of punch guide) 23 Cylindrical shaft (of punch guide) 24 Inner peripheral surface (of punch guide) 25 Bottom holder 26 Thrust bearing 30 Punch body 31 First member 31a, 31Da, 31Ea, 31Fa, 31Ga Cylindrical part (of first member) 31b Bottom (of first member) 311, 311E, 311G Outer peripheral surface (of first member) 312 Cam surface 312D, 312G Slot groove (of first member) 312E, 312F Projection (of first member) 313 Cylindrical shaft (of first member) 314 Punch driver 315 Head nut 316 First spring seat 317 Second spring seat 318 Stripper spring 319D, 319F Inner peripheral surface (of first member) 32 Second member 32a Cylindrical part (of second member) 321, 321A, 321B, 321C, 321D, 321E, 321F, 321G Cylindrical part (of second member) 323 Cylindrical shaft (of second member) 324, 324D, 324F Outer peripheral surface (of second member) 325, 325A, 325B, 325C Contact part (of second member) 325Aa, 325Ba (front end surface of the joint part) 325Ca (roller of the second member) 325D, 325G (protrusions of the second member) 325E, 325F (slot grooves of the second member) 328E, 328G (inner peripheral surface of the second member) 33 Tool holding part 332 Through hole 333 (large diameter part of the tool holding part) 334 Boss part 335 Taper hole 336 Collet 337 Cap 34 Tool holder 40 Sheet peeling tool 41 (tip of the sheet peeling tool) 50 Elastic member L1 (predetermined amount of protrusion) W Workpiece (plate material)

Claims

1. A punch guide comprising a cylindrical main body portion and a bottom holder detachably attached to an end portion of the main body portion, a punch body movably arranged axially along the cylindrical axis of the punch guide inside the punch guide, and a tool holder to which a sheet peeling tool is attached, wherein the tool holder is configured to rotate about the cylindrical axis of the punch guide by converting a linear motion along the axial direction of the punch body into a rotational motion, for a die for peeling a sheet protection sheet.

2. An elastic member is arranged inside the punch guide so that the tool holder is urged in the circumferential direction of the punch guide by an urging force, and when the punch body moves from one end side to the other end side of the punch guide, the tool holder rotates against the urging force of the elastic member. The die for peeling a sheet protection sheet according to Claim 1.

3. The punch body includes a first member having a cylindrical portion, the tool holder includes a second member having a cylindrical portion, and end faces of the cylindrical portion of the first member and end faces of the cylindrical portion of the second member face each other in the axial direction. The die for peeling a sheet protection sheet according to Claim 1 or 2.

4. The end face of the cylindrical portion of the first member is provided with a cam surface protruding axially along the cylindrical axis of the first member and extending along the circumferential direction, and an abutting portion slidably abutting against the cam surface is provided on the end face of the cylindrical portion of the second member. The die for peeling a sheet protection sheet according to Claim 3.

5. The cam surface is an inclined surface inclined at a predetermined inclination angle with respect to a plane perpendicular to the cylindrical axis of the first member at each circumferential position, and the abutting portion is formed of an inclined surface extending along the circumferential direction of the cylindrical portion of the second member and inclined with respect to a plane perpendicular to the cylindrical axis of the second member at each circumferential position. The die for peeling a sheet protection sheet according to Claim 4.

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