JP2008137055A - Punching die - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform the detent of the punch body of a punching die in which the assembled length of the punch is made adjustable without adopting a key way, the working of which is complex and which brings about the deterioration of productivity and the increase of the cost. <P>SOLUTION: By rotatably providing a spacer 6 having a through pin hole 6b in the axial direction between a punch guide 1 and a retainer 2 and holding a knock pin 7 which is inserted so as to be freely inserted into and pulled out of the through pin hole 6b and a pin hole 2b provided on the retainer 2 corresponding to this pin hole with the punch guide 1, the retainer 2 is fit so as not to rotate relatively to the non-circular shaft part 3b of the punch body 1 on the outer periphery of which the chamfer of a plane is performed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a punching die used for a turret punch press. More particularly, the present invention relates to a punching die that has a function of adjusting a punch assembly length and that can prevent a punch body from rotating with a structure advantageous in terms of manufacturing and cost.

For example, the following patent documents 1 and 2 disclose conventional punching dies having the function of adjusting the punch assembly length.
The punching die disclosed in Patent Document 1 includes a cylindrical punch guide, a cylindrical retainer provided on the punch guide, a punch body guided by the punch guide, and an upper outer periphery of the punch body. And a spring that is contracted between the punch head and the retainer. The punch head is connected to the retainer so as not to rotate relative to the retainer and to be axially movable. The punch assembly length is adjusted by changing the screwing amount of the punch head into the punch body.

The punching die (punch structure) disclosed in Patent Document 2 is a punch head with respect to a point where a punch head is screwed into a tap hole at an upper end of a punch driver corresponding to a punch body, or a retainer (spring support ring). Is different from the punching mold of Patent Document 1 in that it is connected with a collar arranged on the inside of the spring. The position where the punch assembly length is adjusted by rotating the punch head is the same as that of Patent Document 1.
JP-A-6-304676 JP-A-56-105830

  A punching die having a function of adjusting the punch assembly length is required to prevent the punch body from rotating with respect to the punch guide. It is necessary to prevent the punch body from rotating together when the punch head is rotated. Also, if the punch edge has a directional shape, the relative position of the punch head and the punch body must be maintained. In order to achieve this purpose, it is necessary to prevent the punch body from rotating with respect to the punch guide.

  In order to meet the demand, the punching die disclosed in Patent Document 1 employs a structure in which a key is provided on the outer periphery of the punch body and the key is engaged with a vertically long key groove provided in the punch guide. Yes. Further, the punching die disclosed in Patent Document 2 employs a structure in which a key is provided on the inner periphery of a punch guide (punch guide) and the key is engaged with a vertically long key groove provided on a punch driver. ing.

  In the punching die disclosed in Patent Document 1, when the cutting edge of the punch is worn, the punch body is pulled out from the punch guide to polish the cutting edge, and then the punch body is rotated to adjust the screwing with the punch head, Thereafter, the punch body is inserted into the punch guide. Therefore, there is an advantage that the punch assembly length can be adjusted without using a tool, but it is necessary to process the key groove in the punch guide, which is troublesome and has a disadvantage that adversely affects the productivity and manufacturing cost of the mold. was there.

  The punching mold disclosed in Patent Document 2 also has the same defects as Patent Document 1 because the key body is provided in the punch body (punch driver).

  Therefore, the present invention provides a key groove that causes a reduction in productivity and an increase in cost due to complicated processing of the punch body of the punching die that can adjust the punch assembly length without using a tool. It is an issue to be able to do without adopting.

In order to solve the above-mentioned problems, the present invention employs a structure in which a spacer that is prevented from rotating by a punch guide is provided, and the punch body is prevented from rotating by engaging the spacer with the punch body so as not to allow relative rotation.
Specifically, a cylindrical punch guide, a ring-shaped retainer that is detachably connected to the upper portion of the punch guide, a punch body guided by the punch guide, and a punch that is screwed onto the upper outer periphery of the punch body A head and a spring contracted between the punch head and the retainer, and the punch head and the retainer are connected to each other so as not to rotate relative to each other and to be relatively movable in the axial direction. In a punching mold in which the distance from the upper end of the punch head to the lower end of the punch body is adjusted by changing the screwing amount, a spacer having an axial through-pin hole is provided between the retainer and the punch guide. In addition, the pin is provided rotatably on the retainer pin, and the pin provided on the retainer corresponding to the pin hole and the pin hole. Provided knock pin connecting or disconnecting freely inserted into the hole and held in the punch guide, the spacer, is fitted to the relative rotation impossible with the non-circular shaft portion subjected to the outer periphery of the chamfer of the plane of the punch body.

  In this punching die, it is preferable that the retainer is provided with a plurality of the pin holes at a constant pitch in the circumferential direction so as to be positioned on a circle concentric with the axis of the punch body.

  Further, a lock mechanism for holding the retainer connected to the punch guide, or a latch in which the lock mechanism is swingably attached to the retainer, and a spring for biasing the latch in the engaging direction, It is preferable to use a groove provided on the outer periphery of the upper portion of the punch guide, and to hold the retainer connected to the punch guide by engaging a check claw provided at the lower portion of the latch with the groove.

  In the punching die of the present invention, a spacer is provided between the retainer and the punch guide, the spacer is prevented from rotating by the punch guide, and the spacer is fitted to the non-circular shaft portion of the punch body so as not to be relatively rotated. Because the body is prevented from rotating, there is no need to machine a keyway in the punch guide or punch body (a flat chamfered portion that has better workability compared to the keyway may be machined into the punch body), resulting in complicated processing There is no problem of productivity reduction and cost increase.

  In addition, if the punch guide is disconnected from the retainer and the knock pin is removed from the pin hole provided in the retainer, the punch body can be manually rotated with respect to the punch head, so the punch assembly length can be adjusted. Easy to do without tools.

  In the case where a plurality of pin holes with which the dowel pins are engaged are provided at a constant pitch, the punch assembly length can be finely adjusted as compared with one having a single pin hole. Since the adjustment amount for each hole becomes smaller as the number of holes is increased, fine adjustment can be performed as the number of holes is increased.

  In addition, a device that holds the retainer connected to the punch guide by providing a lock mechanism does not have a concern that the connection is naturally released.

  In addition, the lock mechanism is composed of a latch, a spring, and a groove provided on the outer periphery of the punch guide, and a check claw provided on the lower part of the latch is engaged with the groove to maintain the connected state of the punch guide and the retainer. Those that do can easily lock and release the lock mechanism.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 6 of the accompanying drawings. The punching die shown in FIGS. 1 to 5 is a cylindrical punch guide 1, a ring-shaped retainer 2 that is detachably connected to the upper portion of the punch guide 1, and a punch guide 1 that guides vertical movement. And a punch head 4 screwed into the outer periphery of a male screw portion 3a provided on the upper portion of the punch body, a spring 5 contracted between the punch head 4 and the retainer 2, and characterizing the present invention. The spacer 6 and the knock pin 7, the lock mechanism 8 which is a preferable element, and the cover 9 surrounding the spring 5 are constituted.

  The punch guide 1 has a flange 1a in the vicinity of the upper end, and a retainer 2 is detachably connected to the flange 1a. Note that a tapered guide surface 1b having an upper recess is formed on the outer peripheral edge of the upper end of the punch guide 1.

  The retainer 2 has a seat hole 2a opened on the lower surface, and a plurality of pin holes 2b (see FIG. 4) for engaging the knock pin 7 at the bottom of the seat hole 2a at a constant pitch in the circumferential direction. It has become. The number of pin holes 2b may be one, but if the number is one, the adjustment range of the punch assembly length becomes rough (the adjustment amount for each hole is P for the screw pitch of the male screw portion 3a and N for the number of pin holes). Therefore, it is preferable to increase the number of pin holes 2b as much as possible for fine adjustment.

  The upper part of the retainer 2 equally divides the cylindrical sleeve into an even number in the circumferential direction (eight parts are shown in the figure), and cuts out every other equally divided part, similarly to the vertically long teeth 2c. It has a structure in which vertically long notches 2d are alternately generated in the circumferential direction. An engagement protrusion 2e protruding radially inward is provided on the inner surface of the upper end of each tooth 2c.

  The punch body 3 processes a hole in a workpiece by projecting a blade edge portion downward from a hole provided in the bottom of the punch guide 1. This punch body 3 is configured as a non-circular shaft portion 3b in which a portion inserted inside the retainer 2 is chamfered with a flat surface on the outer periphery. Here, as shown in FIG. 2, the non-circular shaft portion 3b is chamfered at one location on the outer periphery so that the cross section perpendicular to the axis forms a D-shape, and the chamfering can be performed only once. However, it is also possible to increase the number of so-called two-face chamfered shapes and the number of planes so that the cross section perpendicular to the axis is a polygon or a shape approximate thereto.

  The punch head 4 employs a cylindrical sleeve 4a having a flange 4b connected to the upper end thereof. The lower end of the sleeve 4a is connected to the retainer 2 so that it cannot rotate relative to the retainer 2 but can move in the axial direction. In this case, the lower portion of the cylindrical sleeve 4a has the same structure as that of the upper portion of the retainer, that is, each of the cylindrical sleeves 4a is provided with longitudinal teeth 4c and notches 4d alternately arranged in the circumferential direction. The engaging protrusion 4e protruding radially inward is provided on the inner surface of the lower end of the tooth 4c, and this lower portion is connected to the upper portion of the retainer 2 using the connecting ring 10.

  The connecting ring 10 has an outer diameter surface that is a concentric spherical surface, and the teeth 2c of the tooth 2c are in a state in which the connecting ring 10 is erected (in FIG. 1, it is rotated 90 degrees from the state in which it is laid sideways). It is inserted inside the lower part of the engaging protrusion 2e (or the upper part of the engaging protrusion 4e of the tooth 4c) {see FIG. 4 (c)}, and in this state, the lower tooth 4c of the punch head 4 is used. Are inserted into the notch 2d at the upper part of the retainer 2, and the teeth 2c at the upper part of the retainer 2 are inserted into the notch 4d at the lower part of the punch head 4 so as to be axially slidable. Next, when the total amount of insertion of the teeth 2c and 4c becomes larger than the diameter of the connecting ring 10, the connecting ring 10 is rotated and turned sideways as shown in FIG. The engaging projection 2e at the upper end and the engaging projection 4e at the lower end of the tooth 4c are sandwiched by the elastic restoring force of the spring 5 so as to maintain the connected state. In this state, the retainer 2 and the punch head 4 cannot rotate relative to each other, but the punch head 4 can be pushed down to be relatively close to the retainer 2 and the punch body can be driven without any trouble.

  The spring 5 is used to return the punch body 3 which is hit by a striker (not shown) of the press machine and descends, and is contracted between the retainer 2 and the punch head flange 4b.

  As shown in FIG. 3, the spacer 6 is provided with a center hole 6a having a shape that fits into the non-circular shaft portion 3b of the punch body in the disk of the material, and the axial direction in which the knock pin 7 is passed around the hole 6a. A through pin hole 6 b is further provided, and is disposed in the seat hole 2 a of the retainer 2. Reference numeral 11 denotes a C-type retaining ring attached to the retainer 2, and the spacer 6 is held in the seat hole 2 a by the C-type retaining ring 11.

  The knock pin 7 is provided by being held by the punch guide 1 and standing up at the upper end of the punch guide 1, and the upper end side of the knock pin 7 is in a through pin hole 6 b provided in the spacer 6 and a pin hole 2 b provided in the retainer 2. Inserted.

  The lock mechanism 8 has a latch 8a swingably mounted in a notch 2f (see FIG. 4) provided on the outer periphery of the retainer 2, and the latch 8a and a spring 8b that urges the latch in the engaging direction, The punch guide 1 is constituted by a groove (an annular groove in the figure) 8c provided on the outer periphery of the punch guide 1, and a check claw 8d provided at the lower part of the latch 8a is engaged with the groove 8c so that the punch guide 1 and the retainer 2 are connected. The thing which maintains a state is provided.

  Although a plurality of lock mechanisms 8 may be provided as required, in the case of a mold for fitting the retainer 2 and the upper outer periphery of the punch guide 1 as shown in FIG. It ’s unlikely that you ’re off the 2nd, so you only need one pair.

  The cover 9 is used by being fixed to the punch head 4. The cover 9 is an element provided as necessary, and may be omitted.

  As shown in FIG. 7, the punch guide 1 and the retainer 2 can be held in a connected state with an O-ring 12 interposed therebetween. Therefore, the lock mechanism 8 is not an essential element.

  In the punching mold of the embodiment configured as described above, the spring 5 is fitted on the outer periphery of the sleeve 4a, and then the punch head 4 is connected to the retainer 2 using the ring 10. Next, the spacer 6 is attached to the retainer 2, and then the upper portion of the punch body 3 is inserted into the sleeve 4 a and the male screw portion 3 a is screwed into the inside of the flange portion 4 b of the punch head 4. Further, the lower side of the punch body 3 is inserted into the punch guide 1, and the upper portion of the punch guide 1 is inserted into the retainer 2. The latch 8a guided to the taper guide surface 1b swings toward the disengagement point by the pushing force at this time, and then the latch 8a is restored to the engagement position by the force of the spring 8b and the check pawl 8d. The punch guide 1 and the retainer 2 are connected to each other in the groove 8c, and the entire constituent elements are combined into one. In this state, the punch body 3 that is non-circularly fitted to the spacer 6 is prevented from rotating by the punch guide 1 via the spacer 6 and the knock pin 7 engaged with the spacer.

  This punching die is used by being inserted into a punch holding hole provided in a punch holder (for example, an upper turret of a turret punch press). When the use is repeated and the blade edge of the punch is worn, the punch body 3 is removed from the punch guide and re-polished to regenerate the blade edge. The re-grinding shortens the distance from the upper end of the punch head 4 to the lower end of the punch body 3, that is, the punch assembly length L shown in FIG. Therefore, the changed punch assembly length is restored to the original length by utilizing the adjustment function.

The punch assembly length is adjusted as follows.
(1) Push the latch 8a with a fingertip to unlock the connection by the lock mechanism 8.
(2) With the unlocked state maintained, as shown in FIG. 6, the punch guide 1 is removed from the retainer 2 by, for example, about 2 mm until the knock pin 7 comes out of the pin hole 2b.
(3) Since the spacer 6 can be rotated with respect to the retainer 2 by the above operation (2), the punch assembly length L is adjusted by rotating the punch guide 1 by a necessary amount.
(4) After adjusting the length, the knock pin 7 is engaged with the pin hole 2b of the retainer 2 (the pin hole at the position corresponding to the adjusted position), and the punch guide 1 and the retainer 2 are connected again.
With the above operation, the punch assembly length that has fluctuated due to re-polishing can be easily restored to the original length without using a tool.

  The length from the lower end of the retainer 2 to the upper end of the punch head 4 does not change even after the punch assembly length is adjusted. For this reason, the length of the spring 5 is always kept constant, and fluctuations in the punch restoring force are prevented.

Sectional drawing which shows embodiment of the punching metal mold | die of this invention The figure which shows the fitting state of the spacer and punch body in the position along FIG. Perspective view of spacer (A): Bottom view of retainer, (b): Cross-sectional view along line YY in FIG. 4 (a), (c) Plan view of retainer Cross-sectional view of the ring connecting the retainer and punch head Sectional drawing which shows the assembly length adjustment method of the metal mold | die of FIG. Partial sectional view showing another example of maintaining the connected state of the punch guide and the retainer

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Punch guide 1a 鍔 1b Tapered guide surface 2 Retainer 2a Seat hole 2b Pin hole 2c Teeth 2d Notch 2e Engagement protrusion 2f Notch 3 Punch body 3a Male thread 3b Non-circular shaft 4 Punch head 4a Sleeve 4b 鍔 4c Teeth 4d Notch 4e Engaging protrusion 5 Spring 6 Spacer 6a Center hole 6b Through pin hole 7 Knock pin 8 Lock mechanism 8a Latch 8b Spring 8c Groove 8d Reverse claw 9 Cover 10 Connecting ring 11 C-type retaining ring 12 O-ring L Punch assembly length The

Claims (4)

A cylindrical punch guide (1), a ring-shaped retainer (2) removably connected to the top of the punch guide, a punch body (3) guided by the punch guide (1), and the punch body ( 3) a punch head (4) screwed to the outer periphery of the upper portion, and a spring (5) contracted between the punch head (4) and the retainer (2), the punch head (4) And the retainer (2) cannot be rotated relative to each other and can be moved relative to each other in the axial direction, and the amount of screwing of the punch head (4) with respect to the punch body (3) is changed to change the punch body from the upper end of the punch head (4) In the punching mold in which the distance to the lower end of (3) is adjusted,
A spacer (6) having an axial through pin hole (6b) is rotatably held by the retainer (2) between the retainer (2) and the punch guide (1), and the through pin A knock pin (7) that is removably inserted into a hole (6b) and a pin hole (2b) provided in the retainer (2) corresponding to the pin hole is held by the punch guide (1), and the spacer A punching die characterized in that (6) is fitted to a non-circular shaft portion (3b) of a punch body (3) having a flat chamfered outer periphery so as not to allow relative rotation.   The punching die according to claim 1, wherein the retainer (2) is provided with a plurality of the pin holes (2b) at a constant pitch in the circumferential direction so as to be positioned on a circle concentric with the axis of the punch body (3). .   The punching die according to claim 1 or 2, further comprising a lock mechanism (8) for holding the connected state of the retainer (2) to the punch guide (1).   A latch (8a) in which the lock mechanism (8) is swingably attached to the retainer (2), a spring (8b) for urging the latch (8a) in the engaging direction, and a punch guide (1) And a punch guide (1) and a retainer (2) by engaging a check claw (8d) provided at the lower part of the latch (8a) with the groove (8c). The punching die according to any one of claims 1 to 3, wherein the connected state is maintained.

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