JP2016030310A - Punch polishing device and punch polishing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a punch polishing device and a punch polishing method that are capable of reducing equipment costs and efficiently carrying out polishing work in polishing a punch which is upright arranged in a ring shape.SOLUTION: A punch polishing device 10 is provided with polishing means 16 that includes: a disk-like grindstone 14 whose peripheral surface 13 is brought into contact with cutting edges 12 of a punch 11 which is upright arranged in a ring shape; and a driving part 15 for rotating the grindstone 14. The grindstone 14 whose rotation center is disposed in a radial direction of the ring-shaped punch 11, includes: moving means 34 capable of moving the polishing means 16 in an axial direction and the radial direction of the ring-shaped punch 11; and revolving means 33 capable of revolving the polishing means 16 around the axis center of the ring-shaped punch 11 in a state that the grindstone 14 contacts the cutting edges 12 of the punch 11. In a punch polishing method, after moving the polishing means 16 in the axial direction and the radial direction of the ring-shaped punch 11, the grindstone 14 is rotated by the driving part 15 and the polishing means 16 is revolved around the axis center of the ring-shaped punch 11.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a punch polishing apparatus and a punch polishing method used for polishing a circularly arranged punch.

For example, a laminated iron core constituting a motor has been commercialized by punching a large number of thin iron plates with a mold apparatus, and laminating and integrating them. For such punching, an upper die equipped with a dedicated punch is used.
The punch for punching is worn with its tip (blade edge) as the number of times of punching the thin steel plate increases, so that repair work for polishing the tip of the punch is regularly performed.

  For example, as shown in FIG. 5, an upper die 91 to which a plurality of worn punches (blades) 90 are attached is set on a surface plate of a polishing apparatus (not shown) so that the tips of the punches 90 face upward. There is a method of simultaneously polishing using a grindstone so that the tips of all punches 90 have the same height level (see, for example, Patent Document 1). Note that the punch is not limited to a tip having a horizontal (flat) tip, but includes punches 90a to 90d with shear angles (inclined surfaces) 92a to 92d, for example, as shown in FIGS. (For example, refer to Patent Document 2).

Japanese Patent No. 3131334 Japanese Patent Laid-Open No. 61-172629

However, the conventional polishing method still has the following problems to be solved.
As punches for punching a laminated iron core as described above, there are, for example, a plurality of punches (that is, a group of punches) or one in which one continuous punch is vertically arranged. When trying to polish such a punch at once, it is necessary to use a grinder wider than the outer diameter of the annular punch, which increases the size of the grinder and increases equipment costs. Here, it is conceivable to use a narrow grinding machine to reduce the equipment cost, but in this case, it is necessary to divide the region for polishing the punch into a plurality of regions and perform polishing for each region. Further, there is a possibility that a punching error may occur, and there is a problem that work efficiency is lowered.
In addition, when the above-described punch has a shear angle, even if the above-mentioned wide grinding machine is used, the entire punch cannot be polished at once.

  SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and a punch polishing apparatus capable of reducing equipment costs and efficiently performing polishing work when polishing an annularly arranged punch. An object is to provide a punch polishing method.

The punch polishing apparatus according to the first invention that meets the above-mentioned object is a disk-shaped grindstone that polishes the punch by bringing the peripheral surface into contact with the cutting edge of the punch that is vertically arranged, and a drive that rotates the grindstone A punch polishing apparatus provided with a polishing means comprising a portion,
The grindstone is arranged such that the center of rotation thereof is in the radial direction of the punch arranged upright annularly,
A moving means provided in the polishing means, the polishing means being movable in the axial direction and the radial direction of the punch, which is arranged upright in an annular shape;
Swiveling means provided on the polishing means and capable of turning the polishing means about the axis of the punch arranged in an annular manner in a state where the peripheral surface of the grindstone is in contact with the cutting edge of the punch; Have

  In the punch polishing apparatus according to the first aspect of the invention, the cutting edge of the punch is formed with a cut surface that is inclined in the radial direction of the punch, and the polishing means has an inclination of the cut surface. It is preferable that an angle adjusting mechanism for adjusting the inclination angle of the rotation center of the grindstone according to the angle is provided.

In the punch polishing apparatus according to the first aspect of the present invention, the punch is attached and fixed to the upper mold, the polishing means is provided on the frame body via the turning means, and the frame body can be attached to and detached from the upper mold. It is preferable.
Here, it is preferable that the frame body is provided with positioning assisting means that can float the frame body by air pressure.

  In the punch polishing apparatus according to the first aspect of the present invention, it is possible to attach and remove the punch to the punch, and to align the turning center of the polishing means by the turning means with the axial center of the punch arranged in an annular shape. It is preferable to have a positioning plate to perform.

The punch polishing method according to the second invention that meets the above object uses a polishing means that includes a disc-shaped grindstone and a drive unit that rotates the grindstone, and the edge of the punch that is arranged in an annular shape is placed on the cutting edge of the punch. A method of polishing the punch by contacting a peripheral surface,
The grindstone is arranged such that the center of rotation thereof is in the radial direction of the punch arranged upright in a ring shape, and the polishing means is arranged in the axial direction and the radial direction of the punch arranged upright in a ring shape. After moving the grindstone and bringing the peripheral surface of the grindstone into contact with the cutting edge of the punch, the grinding means is rotated in an annular manner while the grindstone is rotated by the drive unit. And the punch is polished.

  In the punch polishing method according to the second aspect of the present invention, the cutting edge of the punch is formed with a cutting surface inclined in the radial direction of the punch, which is arranged upright in an annular shape, and the grindstone according to the inclination angle of the cutting surface It is preferable to adjust the inclination angle of the rotation center.

In the punch polishing apparatus and the punch polishing method according to the present invention, the grindstone is disposed so that the rotation center thereof is in the radial direction of the punch disposed in a ring shape, and the polishing means including the grindstone is disposed in the ring shape. Since it is moved in the axial direction and radial direction of the arranged punch, and further pivoted around the axial center of the punch arranged vertically, without using a conventional large grinder, The punch can be polished without dividing the region to be polished into a plurality of regions.
Therefore, when polishing a punch arranged upright in an annular shape, the equipment cost can be reduced, and the polishing operation can be carried out efficiently.

  In particular, when a cutting surface that is inclined in the radial direction of the punch arranged in an annular manner is formed on the cutting edge of the punch, the cutting edge is turned by turning the polishing means whose inclination angle of the rotation center of the grindstone is adjusted. Since the polishing of the punch with the cut surface formed on the surface can be performed at once in the circumferential direction, the working efficiency can be greatly improved.

Further, when the frame provided with the polishing means can be attached to and detached from the upper die to which the punch is attached and fixed, it can be polished without removing the punch from the upper die, so that the working efficiency can be further improved.
Here, by providing the frame body with positioning auxiliary means that enables the frame body to float by air pressure, the labor required for moving the frame body (polishing means) can be reduced. For example, when positioning the frame body Fine adjustment can be made easily.

  Further, when the punch polishing apparatus has a positioning plate, alignment of the turning center of the polishing means by the turning means and the axial center of the punch arranged upright in an annular shape can be easily performed with a simple configuration.

It is explanatory drawing which shows the use condition of the punch grinding | polishing apparatus which concerns on one embodiment of this invention. It is a partial expansion perspective view of the punch polishing apparatus. It is a sectional side view of the axial direction moving mechanism and turning means of the punch polishing apparatus. (A), (B) is explanatory drawing which shows the grinding | polishing method of the punch with a shear angle using the punch grinding | polishing apparatus. It is explanatory drawing of the punch grinding | polishing method which concerns on a prior art example. (A)-(D) are explanatory drawings of punches of various shapes.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
As shown in FIGS. 1 to 4, a punch polishing apparatus (hereinafter also simply referred to as a polishing apparatus) 10 according to an embodiment of the present invention has a cutting edge (tip surface) 12 of a punch 11 arranged in a ring shape. A polishing means 16 having a disk-shaped grindstone 14 for polishing the punch 11 and a motor (an example of a drive unit) 15 for rotating the grindstone 14 is provided. This will be described in detail below.

The punch 11 to be polished by the punch polishing apparatus 10 is used for punching a core piece constituting a laminated core.
Specifically, the punch 11 punches out a slot of an iron core piece of a stator (stator). As shown in FIG. 1 and FIG. 2, a plurality of punches 11 (that is, a group of punches) are arranged at slot positions. Corresponding to the above, it is erected on the plate 17 at a predetermined pitch with a gap in the circumferential direction. A punch 18 for punching out the inner shape of the iron core piece is also provided at the center of the plate 17.

The punch to be polished by the polishing apparatus 10 is not limited to the punch 11 described above, and may be, for example, one that punches out a resin injection hole of an iron core piece of a rotor (rotor).
Further, as described above, the punch is not composed of the plurality of punches 11 but may be a continuous one in the circumferential direction (a donut shape), or may be a disc shape (a columnar shape). .
The punch is not limited to the core piece of the laminated core as long as it is erected in a ring shape, and may be used for punching other products.

As shown in FIGS. 1 and 2, the punch 11 is preferably polished by the polishing apparatus 10 in a state in which the plate 17 is attached and fixed to the upper mold 19 of the mold apparatus from the viewpoint of improving workability. However, it can also be polished while being removed from the upper die 19. The upper mold 19 moves up and down in the vertical direction (vertical direction) with respect to the lower mold of the mold apparatus, and posts (not shown) for supporting the upper mold 19 are provided at the four corners. It is erected.
Here, when polishing the punch 11, as shown in FIG. 1, the upper mold 19 is turned upside down and disposed on the pallet 21 via the metal deposit 20, but is not limited thereto. The pallet 21 is for collecting dirt during the cleaning of the punch 11.

As shown in FIGS. 1 and 2, the punch polishing apparatus 10 has a frame 22 that can be attached to and detached from the upper mold 19.
The frame body 22 is arranged on each side of the upper mold 19 in the width direction, and fixing means 23 for clamping the upper mold 19 from the thickness direction, and a plurality (four in this case) standing on the fixing means 23. It has a support column 24 and a support plate portion 25 that is fixedly attached to the upper portion of the support column 24 and disposed above the punch 11 (position overlapping the axis of the punch 11 in plan view).

As shown in FIG. 1, the fixing means 23 includes an upper plate portion 26 that comes into contact with the upper surface of the upper die 19 and a lower plate portion 27 that comes into contact with the lower surface of the upper die 19. The upper plate portion 26 and the lower plate portion 27 are separated by a spacer 28 disposed therebetween so that the distance between the upper plate portion 26 and the lower plate portion 27 is substantially the same as the thickness of the upper mold 19 to be sandwiched. The distance between the upper plate portion 26 and the lower plate portion 27 is adjusted by the bolts 29 so that the fixing means 23 can be attached to and detached from the upper mold 19.
The fixing means may have another configuration as long as it can be attached to and detached from the upper mold 19.

Further, as shown in FIG. 1, the frame body 22 is provided with positioning assisting means 30.
The positioning auxiliary means 30 is fixed to a compressor (air compressor) 31 attached and fixed to a side end of the support plate 25, a hose (not shown) connected to the compressor 31 and supplying compressed air from the compressor 31. A plurality of air outlets 32 are formed in the upper plate portion 26 of the means 23 and eject the compressed air supplied by the hose downward. Each air outlet 32 is formed in the upper plate portion 26 so that the compressed air to be ejected collides with at least the upper surface of the upper mold 19.

In use, after the upper plate portion 26 and the lower plate portion 27 of each fixing means 23 are disposed (temporarily fixed) so as to sandwich the upper mold 19, the fixing means 23 is attached and fixed to the upper mold 19 (positioning). Before the compressor 31 is driven, compressed air is ejected from the air outlets 32 toward the upper surface of the upper mold 19.
Thereby, since the frame body 22 floats with respect to the upper mold | type 19 with an air pressure, the movement (fine adjustment of a position) of the frame body 22 can be performed smoothly. Note that the degree of ascent does not have to be completely ascended.

  As shown in FIGS. 1 to 3, the punch polishing apparatus 10 has an annular polishing means 16 arranged so that the center of rotation of the grindstone 14 is in the radial direction of the plurality of punches 11 arranged in an annular shape. The turning means 33 that can turn around the axial centers of the plurality of punches 11 and the moving means that can move the polishing means 16 in the axial direction and the radial direction of the annular punches 11 respectively. 34. The moving unit 34 moves the polishing unit 16 in the radial direction of the annular punch 11 and an axial direction moving mechanism (in this case, a vertical movement mechanism) 35 that moves in the axial direction of the annular punch 11. And a radial movement mechanism (here, a horizontal movement mechanism) 36.

The swivel means 33 has a swivel shaft 37 disposed on the axis of the plurality of punches 11 and a bearing portion 38 that can rotate in a state where the swivel shaft 37 penetrates the support plate portion 25. Yes.
A turning handle 39 is provided at the upper end of the turning shaft 37. The turning handle 39 includes a disc-like turning plate 40 attached and fixed to the upper end portion of the turning shaft 37, and a plurality of operation rods 41 attached and fixed to the peripheral portion thereof at a predetermined pitch.
In use, for example, an operator can turn the turning handle 39 by using the operation rod 41 to turn the turning shaft 37 connected thereto with respect to the support plate portion 25.

An axial direction moving mechanism 35 is provided on the upper part of the turning shaft 37.
The axial direction moving mechanism 35 has a screw 44 with the top 43 abutting against the upper surface 42 of the pivot shaft 37 in a state where the axis center is the same as that of the pivot shaft 37.
The screw 44 is provided so as to be able to turn with respect to the turning shaft 37 by a fixing portion 47 that accommodates the top portion 43 to which the washer 46 is attached with the shaft portion 45 protruding upward. Further, the screw 44 is provided on the support plate portion 25 and is maintained in an upright state by a support frame 49 in which a screw groove 48 that is screwed to the screw 44 is formed. Further, an axial center handle 50 is attached and fixed to the screw 44 on the front side (upper side) of the shaft portion 45 by a receiving portion 51 and a nut 52.

With this configuration, the rotation operation of the screw 44 of the axial direction moving mechanism 35 and the turning operation of the turning shaft 37 of the turning means 33 can be performed independently.
In use, for example, an operator pivots the axial handle 50 clockwise or counterclockwise to move the top 43 of the screw 44 up and down with respect to the support frame 49, whereby the pivot axis 37 can be moved up and down with respect to the support plate portion 25.
Note that the amount of movement when the swivel shaft 37 is moved up and down can be measured by measuring the height position of the swivel plate 40 with a micro gauge (not shown), but other methods such as a laser distance meter can be used. It can also be measured using.

A radial movement mechanism 36 is provided below the pivot shaft 37.
The radial movement mechanism 36 has a suspending portion 53 attached and fixed in parallel to the punch 11 (upper die 19) below the pivot shaft 37. A guide groove 54 is formed in the suspending portion 53 in the radial direction around the axial center of the annular punch 11, and a slide portion 55 suspended by the suspending portion 53 extends along the guide groove 54. It is movable. In addition, the movement of the slide part 55 is performed by the screw 56 provided in the base part (axial center side of the punch 11) of the hanging part 53. FIG.
In use, for example, the operator can move the slide portion 55 relative to the suspension portion 53 by turning the screw 56 clockwise or counterclockwise.

Polishing means 16 is provided on the slide portion 55 of the radial movement mechanism 36.
Accordingly, the polishing means 16 is provided with the radial movement mechanism 36, and the turning means 33 and the axial movement mechanism 35 are provided via the radial movement mechanism 36.
Further, the polishing means 16 is provided on the support plate portion 25 of the frame body 22 via the turning means 33.

The above-mentioned turning means and moving means are not limited to the above configuration as long as the polishing means can be turned, moved in the axial direction, and moved in the radial direction.
For example, the above-described swiveling means 33 and moving means 34 are configured such that the operation is directly performed manually by an operator, but is not limited to this, and for example, a driving means using a motor or the like is used. It is of course possible to use this automatically. In this case, each operation is preferably controlled by the control unit based on the height position of the polishing means 16 (grinding stone 14) with respect to the punch 11 measured in advance.

As shown in FIGS. 1, 2, 4 (A), and (B), the polishing means 16 is provided with an angle adjusting mechanism 57 that adjusts the inclination angle of the rotation center of the grindstone 14.
The angle adjustment mechanism 57 includes a support frame 58 that supports the motor 15, and the support frame 58 is provided on the slide portion 55 so as to be tiltable by a tilting shaft 59. In addition, a plurality of positioning holes 60 are formed in the slide portion 55 in the circumferential direction around the tilting shaft 59, and after the positions of the through holes 61 formed in the support frame 58 and the positioning holes 60 are aligned. By inserting a positioning pin (not shown) into the through hole 61, the tilting state of the support frame 58 with respect to the slide portion 55 can be maintained.

Thereby, even with a punch having a cut surface that is inclined in the radial direction, the tilt angle of the center of rotation of the grindstone 14 can be adjusted according to the tilt angle of the cut surface.
For example, FIGS. 4A and 4B show a polishing method for the punch 63 in which a cutting surface 62 having a V-shaped cross section is formed on the cutting edge 68. Specifically, FIG. 4A shows a polishing method in which the inclination angle of the rotation center of the grindstone 14 is inclined downward from the axial center position of the punch 11 toward the radially outer side, and FIG. B) is a polishing method when the inclination angle of the rotation center of the grindstone 14 is inclined upward from the axial center position of the punch 11 toward the radially outer side.

Further, the punch polishing apparatus 10 has a positioning plate 64 as shown in FIGS.
The positioning plate 64 is long, and through holes 65 that can be fitted into the punches 11 located on both sides of the axial center are formed at both ends in the length direction. A pin 66 positioned on the axial center of the punch 11 is erected and arranged at the center in the length direction of the positioning plate 64.

The pin 66 can be inserted into a through hole (turning center positioning hole) 67 formed in the lower surface portion of the support frame 58. The through hole 67 is supported so that the slide portion 55 is positioned on the same axis as the turning shaft 37 when the slide portion 55 is positioned on the base end portion (axial center side of the punch 11) of the hanging portion 53. A frame 58 is formed.
Thereby, alignment with the turning center of the grinding | polishing means 16 by the turning means 33 and the axial center of the punch 11 standingly arranged cyclically | annularly can be performed.

Next, a punch polishing method according to an embodiment of the present invention will be described with reference to FIGS.
1) After removing the upper mold 19 from the mold apparatus, the upper mold 19 that is turned upside down is placed on the pallet 21 via the metal deposit 20.
2) After setting the positioning plate 64 with the pins 66 standing on the punch 11, the frame body 22 is temporarily fixed to the upper mold 19.
3) The compressor 31 of the positioning auxiliary means 30 is driven, and compressed air is ejected from the air blowing ports 32 to the upper surface of the upper mold 19 to float the frame body 22.

4) The polishing means 16 is lowered using the axial center handle 50. At this time, the slide portion 55 is positioned at the base end portion of the suspension portion 53, and the through hole 67 formed in the support frame 58 that supports the motor 15 of the polishing means 16 and the turning shaft 37 are connected to the same axis. Keep it in mind.
5) The floating frame 22 is moved so that the pin 66 of the positioning plate 64 can be inserted into the through-hole 67, and the relative position of the polishing means 16 and the punch 11 (the rotation center of the grindstone 14 stands up annularly) The position in the radial direction of the arranged punch 11) is determined.
6) The compressor 31 is stopped, and the frame 22 is positioned with respect to the upper mold 19 by the fixing means 23.
7) The polishing means 16 is raised using the axial direction handle 50 and the positioning plate 64 is removed from the punch 11.

8) The polishing means 16 is moved using the radial movement mechanism 36 so that the peripheral surface 13 of the grindstone 14 is positioned above the cutting edge 12 of the punch 11.
9) The polishing means 16 is lowered using the axial direction moving mechanism 35 so that the peripheral surface 13 of the grindstone 14 comes into contact with the cutting edge 12 of the punch 11. The descent of the polishing means 16 is performed so that the peripheral surface 13 of the grindstone 14 bites the punch 11 by a preset polishing amount (for example, about 10 μm).
10) While rotating the grindstone 14 using the motor 15, the turning means 33 is used to turn the polishing means 16 around the axes of the plurality of punches 11 arranged in a ring shape, and the cutting edge 12 of the punch 11 is turned. The cutting edge 12 of the punch 11 is polished until the shape becomes a predetermined shape.

The positioning plate 64 may be placed on the punch 11 as long as it is before the relative position between the polishing means 16 and the punch 11 is determined.
By the above method, a plurality of punches 11 arranged in an annular shape can be polished at a time, for example, without individually polishing them one by one, so that processing errors between the punches 11 can be reduced, and work efficiency is greatly increased. Can be improved. Moreover, since it is not necessary to use a large grinder as in the prior art, the equipment cost can be reduced.

In addition, when grind | polishing the punch 63 with a shear angle, the following procedure is performed after performing the procedure of above-described 1) -8).
9 ′) The support frame 58 that supports the motor 15 is tilted so that the peripheral surface 13 of the grindstone 14 is inclined, and the positions of the through holes 61 formed in the support frame 58 and the positioning holes 60 formed in the slide portion 55 are changed. After the alignment, a tilting angle of the support frame 58 relative to the slide portion 55 is determined by inserting a positioning pin into the through hole 61.

10 ′) Similar to the above 9), the polishing means 16 is lowered using the axial direction moving mechanism 35 so that the peripheral surface 13 of the grindstone 14 comes into contact with the cutting edge 68 of the punch 63.
11 ′) While rotating the grindstone 14 using the motor 15, the turning means 33 is used to turn the polishing means 16 about the axes of the plurality of punches 63 arranged in a ring shape, and the cutting edge of the punch 63 is rotated. The cutting edge 68 of the punch 63 is polished until the shape of 68 is a predetermined shape, that is, the cut surface 62 is formed. At this time, the cut surface 62 can be formed by sequentially forming the inner diameter side shear angle and the outer diameter side shear angle.

  Therefore, even in the case of the punch 63 with the shear angle, for example, the shear angle can be formed at a time for the plurality of punches 63 without removing the punches 63 one by one from the plate 17 and polishing them. To improve.

As described above, the present invention has been described with reference to the embodiment. However, the present invention is not limited to the configuration described in the above embodiment, and the matters described in the scope of claims. Other embodiments and modifications conceivable within the scope are also included. For example, a case where the punch polishing apparatus and the punch polishing method of the present invention are configured by combining a part or all of the above-described embodiments and modifications is also included in the scope of the right of the present invention.
In the above embodiment, the case where the punch polishing apparatus is moved to the position of the punch to be polished has been described, but it is of course possible to move the punch while fixing the position of the punch polishing apparatus. In this case, for example, the punch is set on the surface plate (on the work table) of the punch polishing apparatus installed in a predetermined position in advance without using the frame.

10: Punch polishing apparatus, 11: Punch, 12: Cutting edge, 13: Peripheral surface, 14: Grinding wheel, 15: Motor (drive unit), 16: Polishing means, 17: Plate, 18: Punch, 19: Upper mold, 20 : Deposit, 21: pallet, 22: frame, 23: fixing means, 24: support, 25: support plate, 26: upper plate, 27: lower plate, 28: spacer, 29: fastening bolt, 30: Positioning auxiliary means, 31: compressor, 32: air outlet, 33: turning means, 34: moving means, 35: axial direction moving mechanism, 36: radial direction moving mechanism, 37: turning axis, 38: bearing portion, 39 : Turning handle, 40: turning plate, 41: operating rod, 42: upper surface, 43: top, 44: screw, 45: shaft, 46: washer, 47: fixing part, 48: screw groove, 49: support frame 50: Handle for axial direction, 51: Receiving Part, 52: nut, 53: suspension part, 54: guide groove, 55: slide part, 56: screw, 57: angle adjustment mechanism, 58: support frame, 59: tilting shaft, 60: positioning hole, 61: penetration Hole: 62: Cut surface, 63: Punch, 64: Positioning plate, 65: Through hole, 66: Pin, 67: Through hole, 68: Cutting edge

Claims (7)

A punch polishing apparatus provided with a polishing means provided with a disk-shaped grindstone for bringing a peripheral surface into contact with a cutting edge of a punch arranged upright in an annular manner and polishing the punch, and a drive unit for rotating the grindstone. And
The grindstone is arranged such that the center of rotation thereof is in the radial direction of the punch arranged upright annularly,
A moving means provided in the polishing means, the polishing means being movable in the axial direction and the radial direction of the punch, which is arranged upright in an annular shape;
Swiveling means provided on the polishing means and capable of turning the polishing means about the axis of the punch arranged in an annular manner in a state where the peripheral surface of the grindstone is in contact with the cutting edge of the punch; A punch polishing apparatus comprising:   2. The punch polishing apparatus according to claim 1, wherein a cutting surface inclined in a radial direction of the punch, which is arranged in an annular shape, is formed on a cutting edge of the punch, and an inclination angle of the cutting surface is formed on the polishing means. A punch polishing apparatus comprising an angle adjusting mechanism for adjusting an inclination angle of a rotation center of the grindstone according to the angle.   3. The punch polishing apparatus according to claim 1, wherein the punch is attached and fixed to an upper mold, the polishing means is provided on the frame body via the turning means, and the frame body can be attached to and detached from the upper mold. A punch polishing apparatus characterized by comprising:   4. The punch polishing apparatus according to claim 3, wherein the frame body is provided with positioning auxiliary means for allowing the frame body to float by air pressure.   The punch polishing apparatus according to any one of claims 1 to 4, further comprising a punching center that is attachable to and detachable from the punch, and that is pivotally arranged by the swiveling means and the punch that is arranged in an annular manner. A punch polishing apparatus comprising a positioning plate for aligning with an axis. This is a method for polishing the punch by using a polishing means having a disk-shaped grindstone and a drive unit for rotating the grindstone, and bringing the peripheral surface of the grindstone into contact with the blade edge of the punch arranged in a ring shape. And
The grindstone is arranged such that the center of rotation thereof is in the radial direction of the punch arranged upright in a ring shape, and the polishing means is arranged in the axial direction and the radial direction of the punch arranged upright in a ring shape. After moving the grindstone and bringing the peripheral surface of the grindstone into contact with the cutting edge of the punch, the grinding means is rotated in an annular manner while the grindstone is rotated by the drive unit. The punch polishing method is characterized in that the punch is polished by turning around the center of the punch.   7. The punch polishing method according to claim 6, wherein a cutting surface that is inclined in a radial direction of the punch, which is arranged in an annular shape, is formed on the blade edge of the punch, and the grinding stone is formed according to an inclination angle of the cutting surface. A punch polishing method comprising adjusting an inclination angle of a rotation center.

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