JP5650494B2 - Punch mold - Google Patents

Description

  The present invention relates to a punch die used in a punch press machine, and more particularly to a punch die that allows a retainer to be attached to and detached from a punch guide easily and quickly.

Conventionally, as this type of punch mold, an inner peripheral groove is provided on the upper inner surface of the punch guide, and a plurality of locations of the inner peripheral groove are provided with notched concave communication passages that communicate with the upper surface of the punch guide. A plurality of flange-like engaging projections that pass through the communication path and can be engaged with the inner circumferential groove are formed at a plurality of positions on the lower surface of the retainer that protrude in a cylindrical shape. Some retainers can be easily attached and detached without using a tool (see, for example, Patent Document 1).
Furthermore, a circumferential groove and an engagement recess are provided on the lower surface of the retainer, and a flange member in the punch guide is provided with a slide member provided with an engagement pin so as to be movable in a radial direction (radial direction). The slide member is urged radially outward by an elastic member such as a coil spring. When the slide member is moved radially inward against the urging force of the elastic member and the engagement pin is moved from the engagement recess to the position of the circumferential groove, the retainer is moved relative to the punch guide. The punch body is moved up and down by this rotation, and the height dimension from the punch head to the punch blade portion can be adjusted.
Further, when the engaging projection provided on the retainer is positioned at the position of the communication path, the retainer can be removed from the upper portion of the punch guide.

Japanese Patent No. 4451372

However, in such a conventional punch die, a plurality of engaging projections are arranged to be exposed on the cylindrical outer peripheral surface of the retainer, so that the retainer is removed from the punch guide and hit another object. If it is handled roughly, such as hitting, the engaging projection may be deformed or damaged. In such a case, there is a problem that it becomes impossible to attach or detach the punch guide.
Further, in order to integrally project and form a plurality of engaging protrusions on the cylindrical outer peripheral surface of the retainer, most of the cylindrical outer peripheral surface excluding these engaging protrusions must be cut and processed. In order to provide the peripheral groove and the engaging recess on the lower surface, it is necessary to perform cutting, and there is a problem that it takes time for these processing operations and the cost is increased. The inner peripheral groove is recessed along the cylindrical inner peripheral surface of the punch guide, and the notched concave communication path is recessed at a plurality of locations on the inner peripheral groove, so that the inner peripheral groove and the communication path are cut. There was a problem that processing was difficult and cost was high.
In addition, the retainer can be attached to and detached from the punch guide only at the insertion position where the engaging protrusion of the retainer and the communication path of the punch guide face each other, and the attachment / detachment position of the punch guide and the retainer in the rotational direction is determined. For this reason, there is a problem in that it is difficult to perform the attaching / detaching work and takes time and effort.
Further, since the height adjustment and the retainer and the punch guide are attached / detached by operating the slide member, when the retainer is rotated with respect to the punch guide in order to perform the height adjustment, the engaging protrusion of the retainer However, there is a possibility that the retainer and the punch guide may be unintentionally detached from the punch guide, thereby causing a fall accident.

  An object of the present invention is to cope with such a problem, and it is possible to easily attach and detach the punch guide and the retainer without a tool without forming a protrusion on the fitting surface of the retainer with respect to the punch guide, The purpose is to attach and detach the punch guide and the retainer at an arbitrary insertion position.

The present invention in order to achieve the above object, a punch guide cylindrical, a punch body having a punch blade portion on its end the punch guide inside reciprocate freely supported in the axial direction of the A punch head attached to the punch body; a retainer detachably attached to an end of the punch guide; an elastic member provided between the punch head and the retainer; and the punch provided to the punch guide. A punch die having a lock means for attaching and detaching the retainer to and from the guide and an operation portion for unlocking the retainer, and the retainer is inserted and fitted along the inner peripheral surface of the punch guide. It has a cylindrical portion, and a groove formed in the outer circumferential surface of the cylindrical portion, wherein the locking means is reciprocated in the circumferential direction along the outer peripheral surface of the punch guide Arranged stationary, and the tubular portion of the groove and the locking portion immovably engage the punch guide in the axial direction, said moving the locking part to engagement release position with said groove An unlocking operation portion, and the unlocking operation portion is formed in an arc shape along the outer peripheral surface of the punch guide, and at the time of engagement of the locking portion and the cylindrical portion, It arrange | positions so that it may expose inside the said outer peripheral surface of the said punch guide, It is characterized by the above-mentioned.

In the present invention having the above-described features, the cylindrical portion of the retainer is inserted and fitted along the inner peripheral surface of the punch guide, and the locking means is moved toward the concave groove formed on the outer peripheral surface of the cylindrical portion. Due to this, the locking means engages with the concave groove of the cylindrical portion, and the cylindrical portion of the retainer is connected to the punch guide so as not to move in the axial direction, and in this connected state, the lock is unlocked by the unlocking operation portion. By moving the means, the engagement between the concave groove of the cylindrical portion and the locking means is released, and the retainer can be removed from the punch guide, so that a protrusion is formed on the fitting surface of the retainer with respect to the punch guide. The punch guide and retainer can be easily attached and detached without tools.
As a result, compared to the conventional one in which a plurality of engaging protrusions are exposed and arranged on the cylindrical outer peripheral surface of the retainer, the punch guide and the retainer are separated from each other and hit against other objects. However, deformation and breakage are unlikely to occur, and the punch guide and the retainer can be securely attached and detached over a long period of time.
Furthermore, compared to the conventional one in which a plurality of engaging protrusions are cut on the cylindrical outer peripheral surface of the retainer, only the concave grooves are cut along the outer peripheral surface of the cylindrical portion, so that the processing man-hours are reduced, Since it is not necessary to recess the inner peripheral groove and the communication path along the cylindrical inner peripheral surface of the punch guide as in the conventional one, the number of processing steps is shortened, the cutting process is easy, and the cost can be reduced.

In particular, when the concave groove is an annular groove that is continuous in the entire circumferential direction along the outer peripheral surface of the cylindrical portion, the cylindrical portion of the retainer is inserted when the cylindrical portion of the retainer is inserted into the inner peripheral surface of the punch guide. Even if it rotates in the circumferential direction, the annular groove that becomes a concave groove can be engaged with the locking means, so that the punch guide and the retainer can be attached and detached at an arbitrary insertion position.
As a result, since the attaching / detaching operation can be performed at an arbitrary position as compared with the conventional one in which the attaching / detaching positions of the punch guide and the retainer in the rotation direction are determined, anyone can quickly attach / detach, and the usability is good.

It is explanatory drawing (partially cutaway front view) which shows the whole structure of the punch metal mold | die which concerns on embodiment of this invention. It is the elements on larger scale of the state which connected the punch guide and the retainer, (a) is a cross-sectional top view, (b) is a vertical front view. It is the elements on larger scale of the state which separated the punch guide and the retainer, (a) is a cross-sectional top view, (b) is a longitudinal front view. It is a disassembled perspective view of the state which separated the punch guide and the retainer. FIG. 6 is a partially enlarged cross-sectional plan view showing a punch die according to another embodiment of the present invention. FIG. 6 is a partially enlarged cross-sectional plan view showing a punch die according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
As shown in FIGS. 1 to 6, a punch die A according to an embodiment of the present invention is supported by a punch guide 1 formed in a cylindrical shape and reciprocally movable in the axial direction inside the punch guide 1. A punch body 2 having a punch blade portion 2a at its end, a punch head 3 attached to the punch body 2, and a retainer 4 attached to the end of the punch guide 1 so as to be rotatable and detachable. An elastic member 5, which is provided between the punch head 3 and the retainer 4 and is used for returning the punch body 2, such as a spring, is provided as a main component.

The punch guide 1 is a cylindrical guide held by a punch holder (not shown) of a punch press machine.
In the punch guide 1, an end portion on the retainer 4 side which will be described later in the axial direction of the punch guide 1 is provided so as to be movable in and out from an inner peripheral surface 1 a of the punch guide 1 toward a tubular portion 4 a on the retainer 4 side which will be described later. 6 and an unlocking operation portion 7 to be described later for moving the lock means 6 in the disengagement direction.
More specifically, a through hole 1c is formed at the end of the punch guide 1 on the retainer 4 side, which will be described later, in the axial direction so as to communicate from the inner peripheral surface 1a of the punch guide 1 to the outer peripheral surface 1b. A lock means 6 to be described later and an operation unit 7 to be unlocked to be described later are disposed in the through hole 1c.

The retainer 4 includes a cylindrical portion 4a inserted and fitted in the axial direction of the punch guide 1 through a sliding gap inside the punch guide 1, and a concave groove 4b formed on the outer peripheral surface of the cylindrical portion 4a. It is a retainer collar.
The cylindrical part 4 a is formed so that its outer diameter is slightly smaller than the inner diameter of the punch guide 1, and is fitted to each other by inserting the cylindrical part 4 a of the retainer 4 along the inner peripheral surface 1 a of the punch guide 1. A concave groove 4b is formed on the outer peripheral surface thereof so as to engage with locking means 6 described later.
The concave groove 4b is preferably an annular groove that is continuous in the entire circumferential direction along the outer peripheral surface of the tubular portion 4a.
A flange portion 4c that projects annularly along the end surface on the retainer 4 side of the punch guide 1 is integrally provided at the end portion of the tubular portion 4a.

The lock means 6 has a lock piece 6 a that can reciprocate in the direction intersecting the axial direction of the punch guide 1.
More specifically, the lock piece 6a is provided so as to reciprocate in the circumferential direction along the outer peripheral surface 1b of the punch guide 1 or in the linear direction along the radial direction passing through the center line of the punch guide 1. Yes.
In the installed state of the lock means 6, one end of the lock piece 6a, specifically, the radially inner end passing through the center line of the punch guide 1 is arranged so as to protrude from the inner peripheral surface 1a through the through hole 1c of the punch guide 1. Has been. At the inner end, a locking portion 6b is formed, which is engaged with the concave groove 4b of the cylindrical portion 4a of the retainer 4 so as to be immovable in the axial direction of the punch guide 1 by the protruding movement of the lock piece 6a.
In the installed state of the lock means 6, the other end of the lock piece 6a, specifically the outer end in the radial direction passing through the center line of the punch guide 1, is arranged so as to be exposed from the through hole 1c of the punch guide 1 toward the outer peripheral surface 1b. Has been. An unlocking operation portion 7 is formed in the exposed portion of the outer end.
Further, the locking means 6 is provided with a pressing means 6c that elastically presses the locking portion 6b so as to protrude from the inner peripheral surface 1a of the punch guide 1 toward the concave groove 4b of the cylindrical portion 4a of the retainer 4. It is preferable.

  In the example shown in FIGS. 2A, 2B, 3A, 3B, and 4, the locking piece 6a of the locking means 6 is formed in a flat plate shape, and a long hole that penetrates and opens through the locking piece 6a. By inserting a support pin 1d provided in the through hole 1c of the punch guide 1 into 6d, the lock piece 6a has a circumferential direction along the outer peripheral surface 1b of the punch guide 1, that is, a center line of the punch guide 1. It is arranged so as to be able to reciprocate along a linear direction intersecting with the radial direction passing therethrough.

The flat locking piece 6a has a radially inner end that passes through the center line of the punch guide 1 and is recessed in an arc shape along the outer peripheral surface of the cylindrical portion 4a of the retainer 4, and the protruding portion of the end portion is engaged. The outer end in the radial direction passing through the center line of the punch guide 1 is formed in a substantially crescent shape so as to protrude in an arc shape along the outer peripheral surface 1b of the punch guide 1 as well as the stop portion 6b.
On the outer end portion of the lock piece 6a that protrudes in an arc shape, an uneven portion is formed as the unlocking operation portion 7 so as to come into contact with a fingertip or the like without slipping. It is preferable to form a recessed portion 1e around the through hole 1c on the outer peripheral surface 1b of the punch guide 1 so that the fingertip can easily come into contact with the concavo-convex portion serving as the unlocking operation portion 7.
A coil spring is provided as a pressing means 6c between the long hole 6d of the lock piece 6a and the support pin 1d.

Although not shown in the drawings as another example, the lock piece 6a is formed in a shaft shape instead of a flat plate shape, or the lock piece 6a is not in a linear direction along the outer peripheral surface 1b of the punch guide 1, but in the center of the punch guide 1. It is also possible to arrange such that it can reciprocate in a straight line direction along the radial direction passing through the line.
In the illustrated example, only one locking means 6 is provided in the circumferential direction with respect to the punch guide 1.
Further, as the retainer 4 is inserted into the punch guide 1, the leading edge of the cylindrical portion 4 a of the retainer 4 that abuts against each other and the engaging portion 6 b of the locking means 6 are formed in an inclined shape and inserted. When the leading edge of the cylindrical portion 4a of the retainer 4 is abutted against the engaging portion 6b of the locking means 6, the engaging portion 6b of the locking means 6 automatically escapes and moves to the concave groove 4b of the retainer 4. Is configured so that the locking portion 6b of the locking means 6 protrudes and engages with the concave groove 4b of the retainer 4 when it reaches a position facing the locking portion 6b of the locking means 6. It is also possible.

Here, a method for attaching and detaching the punch guide 1 and the retainer 4 will be described.
In the state shown in FIG. 1 and FIGS. 2A and 2B, the lock piece 6a of the lock means 6 is elastically pressed by the pressing means 6c so that the engaging portion 6b protrudes from the inner peripheral surface 1a of the punch guide 1. Pressed.
As a result, the punch guide 1 and the retainer 4 are coupled to each other by engaging the concave groove 4b of the cylindrical portion 4a of the retainer 4 and the punch guide 1 so as not to move in the axial direction.

  In this connected state, as shown in FIG. 3 (a), the unlocking operation portion 7 is pushed with a fingertip or the like, and the locking piece 6a of the locking means 6 resists the pressing means 6c so that the locking portion 6b is moved. When operated so as to be separated from the groove 4b of the cylindrical portion 4a of the retainer 4 and to be immersed in the inner peripheral surface 1a of the punch guide 1, the engagement between the locking portion 6b and the groove 4b of the cylindrical portion 4a of the retainer 4 Is released, and the cylindrical portion 4a of the retainer 4 can be removed from the inner peripheral surface 1a of the punch guide 1, as shown in FIGS.

According to such a punch die A according to the embodiment of the present invention, the cylindrical portion 4a of the retainer 4 is inserted and fitted along the inner peripheral surface 1a of the punch guide 1 to the concave groove 4b of the cylindrical portion 4a. By moving the direction locking means 6 to engage with each other, the cylindrical portion 4a of the retainer 4 is connected to the punch guide 1 so as not to be movable in the axial direction thereof, and is locked by the unlocking operation portion 7 in the connected state. The retainer 4 can be removed from the punch guide 1 by moving the means 6 to release the engagement between the concave groove 4 b and the lock means 6.
Accordingly, the punch guide 1 and the retainer 4 can be easily attached and detached without a tool without forming a protrusion on the fitting surface of the retainer 4 with respect to the punch guide 1.

In particular, when the concave groove 4b is an annular groove that is continuous in the entire circumferential direction along the outer peripheral surface of the cylindrical portion 4a, the cylindrical portion 4a of the retainer 4 is inserted into the inner peripheral surface 1a of the punch guide 1. Even if one of these rotates in the circumferential direction with respect to the other and the relative position of the inner peripheral surface 1a of the punch guide 1 and the cylindrical portion 4a of the retainer 4 changes in the circumferential direction, the annular shape that forms the groove 4b The groove can be engaged with the locking means 6.
Thereby, the punch guide 1 and the retainer 4 can be attached and detached at an arbitrary insertion position.
As a result, anyone can quickly attach and detach, and it is easy to use.

Further, as shown in FIGS. 2 (a), 2 (b), 3 (a), 3 (b) and 4, the locking piece 6a of the locking means 6 is moved in the circumferential direction along the outer peripheral surface 1b of the punch guide 1, In other words, when it is arranged so as to be able to reciprocate in a linear direction that intersects the radial direction passing through the center line of the punch guide 1, the user can hold the punch guide 1 with one hand while holding the punch guide 1 with its fingertip. , The locking piece 6a is reciprocated in the circumferential direction along the outer peripheral surface 1b of the punch guide 1, so that the locking portion 6b of the locking means 6 can be moved in the unlocking direction. The retainer 4 side can be attached to and detached from the punch guide 1 while holding the retainer 4 side with one hand.
Accordingly, the punch guide 1 and the retainer 4 can be easily attached and detached while being held with both hands.
As a result, the punch guide 1 and the retainer 4 can be attached and detached safely, and accidents such as dropping can be prevented.
Next, each embodiment of the present invention will be described with reference to the drawings.

  In the first embodiment, as shown in FIGS. 1 to 4, the concave groove 4 b is an annular groove that continues in the entire circumferential direction along the outer peripheral surface of the tubular portion 4 a, and the punch head 3 is attached to the retainer 4. It is connected so that relative rotation is impossible and relative movement in the axial direction corresponding to at least the punch stroke is allowed, and the screw portion 2b of the punch body 2 is screwed to the punch head 3 so as to be movable in the axial direction. The punch body 2 is disposed so as not to be rotatable relative to the punch guide 1, and the height of the punch blade 2 a can be adjusted without a tool by the relative rotation of the punch guide 1 and the retainer 4.

  At the connecting portion between the punch guide 1 and the retainer 4, the rotation preventing means 8 for stopping the relative rotation of the punch guide 1 and the retainer 4, and the rotation preventing means 8 can be mutually rotated by the punch guide 1 and the retainer 4. An anti-rotation operation portion 9 that is moved as described above is provided separately from the lock means 6 and the lock release operation portion 7.

  The anti-rotation means 8 locks the punch guide 1 and the retainer 4 so that they cannot rotate relative to each other. The locking portion 8 a is supported so as to be movable in the axial direction with respect to the punch guide 1, and the flange portion of the retainer 4. A locking hole 8b that is provided in 4c and into which the tip of the locking portion 8a is fitted, a biasing means 8c that elastically presses the locking portion 8a toward the locking hole 8b of the retainer 4, and an external operation. An anti-rotation operation portion 9 that moves the locking portion 8a to a position disengaged from the locking hole 8b against the biasing means 8c is provided.

In the example shown in FIGS. 1 to 4, the locking portion 8 a is a pin inserted into the holding hole 1 f opened in the axial direction on the outer periphery of the punch guide 1, and the end of the pin and the holding hole A coil spring is provided as an urging means 8c between 1f, and a release button is integrally formed as an anti-rotation release operating portion 9 at an intermediate position of the pin. The release button is continuous with the holding hole 1f. It is opened to the outside through the formed recess 1g and can be operated from the outside with a fingertip or the like.
In the example shown in FIGS. 1 to 4, a plurality of locking holes 8 b are provided at equal intervals in the circumferential direction in the flange portion 4 c of the retainer 4, and a locking portion 8 a is provided in any one of these locking holes 8 b. The amount of rotation of the retainer 4 relative to the punch guide 1 can be adjusted by inserting the pin.

  Furthermore, in the example shown in FIGS. 1 to 4, the punch head 3 is integrally formed with a convex portion 3 b on the outer periphery of the tip of the sleeve portion 3 a. On the inner peripheral surface of the cylindrical portion 4a of the retainer 4, a groove portion 4d through which the convex portion 3b of the punch head 3 passes in the axial direction and a concave portion 4e that engages with the convex portion 3b of the punch head 3 in the axial direction are formed. ing. The convex portion 3b formed on the outer periphery of the tip of the sleeve portion 3a of the punch head 3 is inserted along the position of the groove portion 4d to the lower end side of the retainer 4, and then the sleeve portion 3a and the retainer 4 of the punch head 3 are inserted. The punch head 3 is connected to the retainer 4 so as not to rotate relative to the retainer 4 and the axial direction with respect to the screw portion 2b of the punch body 2 by rotating the protrusion 3b relative to the recess 4e. Screwed to move freely. The punch body 2 is engaged with a key groove 1 h formed in the punch guide 1 on the outer periphery of the key 2 c to prevent relative rotation with the punch guide 1.

As a result, when the locking portion 8a is moved by manual operation of the detent release operation portion 9 and removed from the locking hole 8b of the retainer 4, the retainer 4 remains attached to the punch guide 1 with respect to the punch guide 1. It becomes possible to make relative rotation. By the relative rotation, the punch body 2 and the punch head 3 are rotated relative to each other, so that the punch blade portion 2a can move in the axial direction, and the height of the blade edge changes.
Therefore, it is possible to adjust the height of the punch blade portion 2a worn without a tool while the retainer 4 and the punch body 2 are attached to the punch guide 1.

According to such a punch die A according to the embodiment of the present invention, it is possible to prevent the punch guide 1 and the retainer 4 from being separated during height adjustment.
As a result, the punch guide 1 and the retainer 4 are not unintentionally detached and the unexpected fall accident compared to that of Patent Document 1 in which the height is adjusted by operating the slide member and the retainer and the punch guide are attached and detached. There is an advantage that it can be prevented and is safe.

  In the second embodiment, as shown in FIG. 5, the configuration in which a plurality of locking means 6 are arranged in the circumferential direction with respect to the punch guide 1 at predetermined intervals, respectively, is shown in the first embodiment shown in FIGS. Unlike the above, the other configuration is the same as that of the first embodiment shown in FIGS.

In the example shown in FIG. 5, two lock means 6 are arranged with respect to the punch guide 1.
Although not shown as another example, it is possible to arrange three or more lock means 6 with respect to the punch guide 1.

  According to such a punch die A according to the second embodiment of the present invention, the number of engagement points between the annular groove serving as the concave groove 4b and the lock means 6 is increased, so that the cylindrical portion 4a of the retainer 4 and the punch guide 1 are There is an advantage that it can be securely connected without rattling.

  In the third embodiment, as shown in FIG. 6, the configuration in which the concave groove 4 b is partially formed in the circumferential direction only at a portion facing the locking means 6 instead of the annular groove is shown in FIGS. 1 to 4. Unlike Example 1, the other configuration is the same as that of Example 1 shown in FIGS.

In the example shown in FIG. 6, the concave groove 4 b is formed in the outer circumferential surface of the cylindrical portion 4 a so as to be linearly cut in a direction intersecting the axial direction of the punch guide 1.
Further, although not shown as another example, it is also possible to form the concave groove 4b in a hole shape.

  According to the punch die A according to the third embodiment of the present invention, although the insertion position of the cylindrical portion 4a of the retainer 4 with respect to the inner peripheral surface 1a of the punch guide 1 is limited, the cutting of the concave groove 4b is performed. There is an advantage that the cost can be reduced easily.

  In the previous embodiment, the height of the punch blade 2a can be adjusted without tools by relative rotation of the punch guide 1 and the retainer 4. However, the present invention is not limited to this, and the punch blade 2a can be adjusted by other means. The height may be adjusted.

DESCRIPTION OF SYMBOLS 1 Punch guide 1a Inner peripheral surface 1b Outer peripheral surface 2 Punch body 2a Punch blade part 2b Screw part 3 Punch head 4 Retainer 4a Cylindrical part 4b Groove 5 Elastic member 6 Locking means 6a Lock piece 6b Locking part 7 Operation for unlocking Part 8 Non-rotating means 9 Non-rotating release operation part

Claims (4)

A punch guide cylindrical, a punch body having a punch blade portion on its end the punch guide inside is supported reciprocably in the axial direction of the punch head mounted to the punch body, the punch guide A retainer that is detachably attached to an end portion, an elastic member that is provided between the punch head and the retainer, and a lock unit that attaches / detaches the retainer to / from the punch guide provided on the punch guide And an unlocking operation section, and a punch die,
Said retainer includes a cylindrical portion which is fitted inserted along the inner peripheral surface of the punch guide, a groove formed in the outer circumferential surface of the cylindrical portion,
Said locking means, said punch guide is in the arranged reciprocably to the outer periphery along the surface circumferential direction, the engaging portion for immovably engage the groove of the cylindrical portion to the punch guide in the axial direction , the locking unit has, with the unlocking operating portion is moved to the disengaged position of said groove,
The unlocking operation portion is formed in an arc shape along the outer peripheral surface of the punch guide, and is inside the outer peripheral surface of the punch guide when the locking portion and the cylindrical portion are engaged. A punch mold characterized by being arranged to be exposed . The groove is, the cylindrical portion and the punch tool of claim 1, wherein the along the outer peripheral surface an annular groove continuous in the entire circumferential direction of the. Said locking means includes said punch guide the lock piece along the outer peripheral surface is arranged to freely reciprocate the linear direction intersecting the radial direction passing through the center line of the punch guide, the punch in the locking piece The engaging portion protrudes from the inner peripheral surface of the punch guide at the radially inner end passing through the center line of the guide, and when projecting, the concave portion of the tubular portion and the axial direction of the punch guide It is arranged so as to be immovably engaged, and the unlocking operation part is exposed along the outer peripheral surface of the punch guide at the radially outer end passing through the center line of the punch guide in the lock piece . The punch die according to claim 1 or 2, wherein the punch die is arranged in the above. The punch head is connected to the retainer so as not to rotate relative to the retainer and to allow relative movement in an axial direction corresponding to at least a punch stroke, and a screw portion of the punch body is screwed to be movable in the axial direction. Together
The connecting portion of the punch guide and the retainer includes a detent means for mutual non-rotatably engaging the punch guide and the retainer, the detent releasing operating portion for moving the detent means to the unlocking direction , according to claim 1, 2 or 3 punching die, wherein the provided separately from the locking means and the unlocking operation unit.

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