JP2012250290A - Punch die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a punch die which achieves the alignment of high accuracy by setting a space between a retainer collar and a punch driver provided to the punch die to be zero.SOLUTION: The punch die is constituted such that a punch body 41 having a punch blade part 101 on its lower end is provided in a cylindrical punch guide 17 in a vertically movable manner, a stopper spring 35 is elastically equipped between a punch head 33 provided on the upper end of a punch driver 31 through which a retainer collar 27 provided on the upper part of the punch guide 17 is passed in a vertically movable manner and the retainer collar 27, and an adjusting screw member 49 integrated with or integrally provided on the upper part of the punch body 41 is screwed to a female screw part 45 provided on the punch driver 31 in a vertically adjustable manner. A tapered part 39T suitable for a downward tapered part 29 formed on the lower part of the retainer collar 27 is provided on the lower part of the punch driver.

Description

  The present invention relates to a punch die that is used by being mounted on a punch press such as a turret punch press. More specifically, the retainer collar provided in the punch die and a punch driver are more accurately aligned. The present invention relates to a punch mold that can be performed.

  A punch die used by being mounted on a punch press such as a turret punch press has a cylindrical punch guide that is supported by a punch holder such as an upper turret in the turret punch press so as to be movable up and down. And in this punch guide, the punch body which equipped the punch blade part integrally or integrally in the lower end part is provided. Further, a powerful stripper such as a coil spring or a disc spring is provided between the punch head provided at the upper end portion of the punch driver penetrating the retainer collar provided at the upper part of the punch guide so as to move up and down and the retainer collar. The spring is elastic.

  Further, in order to adjust the height when the punch blade portion is re-polished, an adjustment screw member provided integrally or integrally with the upper portion of the punch body is positioned in the female screw portion provided in the punch driver. Adjustable screwed. And in order to always keep the directionality of the punch body with respect to the punch guide, a key provided in the punch body is engaged with a key groove provided in the punch guide so as to be movable up and down.

  In the above configuration, if the axis of each component is displaced, for example, a galling phenomenon may occur between the key and the key groove or between the punch guide and the punch body. The structure which tries to align is proposed (for example, refer patent document 1).

JP 2002-282926 A

  The configuration described in Patent Literature 1 includes a punch head provided at the upper end portion of a punch driver penetrating a presser block provided at an upper portion of a punch guide so as to be movable up and down, and a disc-like shape disposed below the punch head. A stripper spring is mounted between the presser member and the presser block. And the inner flange part provided in the upper part of the cylindrical elastic holding member integrally provided in the said pressing block surrounding the said stripper spring, and the said pressing member are the structures fitted by a taper part.

  Therefore, in the configuration of Patent Document 1, although the disk-shaped pressing member and the cylindrical elastic holding member can be aligned by fitting the tapered portion, the disk-shaped pressing member and the Since there is a minute clearance between the presser block and the punch driver, and the fitting of the tapered portion is performed at a portion of the punch guide and the punch head that is far away from the punch body, the punch guide The effect of aligning the shaft core with the punch body and the shaft core of the punch driver is small, and further improvements have been desired.

  The present invention has been made in view of the above-described problems. In the cylindrical punch guide, a punch body having a punch blade portion at the lower end portion is provided so as to be movable up and down, and is provided at an upper portion of the punch guide. A stripper spring is provided between the punch head provided at the upper end portion of the punch driver penetrating the retainer collar so as to move up and down and the retainer collar, and is provided integrally or integrally on the upper portion of the punch body. A punch mold in which an adjustment screw member is screwed to a female screw portion provided in the punch driver so as to be vertically adjustable, and a taper portion fitted to a downwardly widening taper portion formed at a lower portion of the retainer collar A high-precision fitting hole provided at the lower part of the punch driver and provided at the lower side of the female screw part in the punch driver is provided with a height provided at the lower side of the male screw part in the adjustment screw member. Is characterized in that the degree fitting portion Aru fitting engagement with.

  According to the present invention, since the taper portion formed in the retainer collar and the taper portion provided in the punch driver are fitted, the gap between the retainer collar and the punch driver can be reduced to zero. High-precision alignment can be performed.

It is front sectional explanatory drawing of the punch metal mold | die which concerns on embodiment of this invention. It is a section explanatory view showing the composition of the lubricating oil supply way in the punching die concerning the embodiment of the present invention. It is sectional explanatory drawing which shows the attachment state of the key with respect to a punch body. It is a perspective explanatory view showing punch tips of various shapes.

  Referring to FIG. 1, a punch die 1 according to an embodiment of the present invention is used by being mounted on a punch holder 3 such as an upper turret in a punch press (not shown) such as a turret punch press. is there. In the punch holder 3, lifter springs 7 that support the punch die 1 so as to move up and down are provided at a plurality of locations around a punch mounting hole 5 that fits and attaches the punch die 1 so as to move up and down. ing. More specifically, lifter spring accommodating holes 9 are provided at a plurality of locations around the punch mounting hole 5 in the punch holder 3, and bolts (guide members) 11 stand in the lifter spring accommodating holes 9. An elastic member 15 such as a coil spring is mounted between the lifter ring 13 fitted to the bolt 11 so as to be movable up and down and the bottom of the lifter spring accommodating hole 9. Since the lifter spring 7 has a well-known configuration, a detailed description of its function and operation is omitted.

  The punch die 1 is provided with a cylindrical punch guide 17 that is mounted in the punch mounting hole 5 so as to be movable up and down. A plurality of locations on the outer peripheral surface of the punch guide 17 includes the lifter spring 7. A supported portion 19 such as a pin supported by the lifter ring 13 is provided. The supported portion 19 may be configured as a flange. Further, a vertical key groove 23 that engages with a guide key 21 provided in the punch holder 3 is formed on the outer peripheral surface of the punch guide 17.

  An inner flange 25 projecting inward is provided on the upper portion of the punch guide 17, and a retainer collar 27 rotatably provided on the upper portion of the inner flange 25 includes an axis of the punch guide 17 and a retainer collar. 27 is provided with a lower projecting portion 29 whose outer peripheral surface is in sliding contact with the inner peripheral surface of the inner flange 25 so as to coincide with the axial center of the inner flange 25. And between the retainer collar 27 and the punch head 33 integrally fixed to the upper part of the cylindrical punch driver 31 which penetrated the axial center part of the retainer collar 27 movably up and down, for example, a disc spring etc. A powerful stripper spring (elastic member) 35 is elastically mounted. A cylindrical cover 37 surrounding the stripper spring 35 is attached to the upper portion of the punch guide 17.

  At the lower part of the punch driver 31, a flange portion 39 is provided in which the upper surface in the vicinity of the outer peripheral edge is in contact with the lower surface of the inner flange 25 in the punch guide 17. Includes an automatic alignment function unit for automatically aligning each other. That is, the lower protrusion 29 in the retainer collar 27 is formed with a tapered hole 29T having a gradually increasing lower diameter, and the upper surface of the flange portion 39 in the punch driver 31 has the tapered hole 29T. A taper portion 39T that can freely engage and disengage from 29T is formed. Therefore, the centering is automatically performed when the tapered hole 29T of the retainer collar 27 and the tapered portion 39T of the punch driver 31 are engaged.

  As described above, when the taper hole 29T and the taper portion 39T are engaged and self-alignment is performed as described above, the gap (clearance) between the taper hole 29T and the taper portion 39T becomes zero, More accurate centering is performed.

  An adjustment screw member 43 provided integrally or integrally with the punch driver 31 is screwed onto the punch driver 31 so as to be vertically adjustable. That is, a female screw portion 45 is formed on the inner peripheral surface of the punch driver 31, and a high-precision fitting hole portion whose inner diameter (inner peripheral surface) is processed with high accuracy is formed below the female screw portion 45. 47 is formed. The adjustment screw member 43 is provided with a male screw portion 49 that is threadably engaged with the female screw portion 45 so as to be adjustable in the vertical direction. Corresponding to the precision fitting hole 47, a high-precision fitting portion 51 is formed by machining the outer diameter (outer peripheral surface) with high accuracy.

  Therefore, even when a backlash exists in the threaded portion between the female screw portion 45 and the male screw portion 49 of the punch driver 31, the high-precision fitting portion 51 is fitted into the high-precision fitting portion 47. The clearance between them is on the order of microns, and the axis of the punch driver 31 and the axis of the adjusting screw member 43 are exactly matched. Even when a lateral (radial) component force acts on the adjustment screw member 43, the punch driver 31 is fitted by the high-precision fitting hole 47 and the high-precision fitting portion 51. And the axis of the adjustment screw member 43 are always kept in a state of coincidence.

  As already understood, by fitting the lower protrusion 29 of the retainer collar 27 to the inner peripheral surface of the inner flange 25 of the punch guide 17, the axial center of the punch guide 17 and the retainer collar 27 is aligned. The axial center of the retainer collar 27 and the punch driver 31 is aligned by engaging the tapered portion 39T of the punch driver 31 with the tapered hole 29T formed in the lower protruding portion 29 of the retainer collar 27. Retained. Then, by fitting the high-precision fitting portion 51 of the adjustment screw member 43 into the high-precision fitting hole 47 of the punch driver 31, the axial centers of the punch driver 31 and the adjustment screw member 43 are aligned. Retained. Therefore, it becomes a highly accurate punch die in which the axial centers of the above-described constituent elements coincide.

  The vertical adjustment of the adjustment screw member 43 is performed by rotating the punch driver 31 with respect to the adjustment screw member 43. By the way, since the strong urging force of the stripper spring 35 acts on the punch driver 31, the punch driver 31 and the retainer collar 27 rotate integrally. Therefore, in order to restrict the rotation of the punch driver 31 in the normal state, the outer peripheral surface of the lower projection 29 of the retainer collar 27 is formed with recesses 53 at appropriate intervals in the circumferential direction. The punch guide 17 is provided with a stopper 55 that can be engaged and disengaged with respect to the recess 53 so as to be movable in the radial direction (radial direction) and biased inward. In addition, since the structure of the said stopper 55 etc. is a well-known structure, more detailed description of the said stopper 55 etc. is abbreviate | omitted.

  A circular fitting engagement portion 57 having a diameter larger than the outer diameter of the punch driver 31 is provided at the lower portion of the adjustment screw member 43, and a radial direction formed on the lower surface of the fitting engagement portion 57. Keys 63A and 63B slidably engaged with vertical key grooves 61A and 61B formed in the punch guide 17 are integrally attached to both end sides of the key groove 59 via a fixture such as a bolt. . In the fitting engagement portion 57, a lubricating oil hole 65 (see FIG. 2) serving as a lubricating oil passage communicating with the vertical through hole 43H formed in the shaft core portion of the adjusting screw member 43 is radially provided. It is formed. Further, the fitting engagement portion 57 is provided with an elastic member 67 such as rubber for preventing the close contact with the lower surface of the punch driver 31 so as to protrude upward.

  The punch body 41 fitted into the punch guide 17 so as to be movable up and down is a punch body 41 in a minute clearance (micron order clearance) between the inner peripheral surface of the punch guide 17 and the outer peripheral surface of the punch body 41. In order to suppress the galling phenomenon caused by the relative inclination of the film, it is formed long in the vertical direction. That is, on the upper surface of the punch body 41, an engagement recess 69 is formed in which the insertion engagement portion 57 of the adjustment screw member 43 is engaged. In other words, the upper end surface 41U of the punch body 41 is provided at a height position surrounding the flange portion 39 in the punch driver 31. When the lower end surface 41L of the punch body 41 is raised with respect to the punch guide 17, it is located at substantially the same height as the plate presser holder 71 detachably attached to the lower portion of the punch guide 17. Is provided.

  Therefore, the relative slight inclination of the punch body 41 due to the minute clearance between the punch guide 17 and the punch body 41 can be suppressed, and the occurrence of the galling phenomenon can be suppressed.

  By the way, the punch body 41 is engaged with the engagement engagement portion 57 of the adjustment screw member 43 in the engagement recess 69 of the punch body 41, and the radial key groove 73 formed in the punch body 41. In the state where the keys 63A and 63B are engaged with each other, they are integrally attached to the lower portion of the adjusting screw member 43 by a plurality of fixing tools 75 (see FIG. 2) such as mounting bolts. Between the adjusting screw member 43 and the punch body 41, a ring-shaped washer 81 for supporting a mounting screw 79 for detachably replacing the punch tip 77 on the lower surface of the punch body 41 is provided.

  As described above, when the fitting engagement portion 57 of the adjustment screw member 43 is fitted and engaged with the engagement recess 69 of the punch body 41 and is integrally fixed, the shaft core of the adjustment screw member 43 and the punch body 41 are fixed. It is fixed in a state where the shaft core coincides. Therefore, the axial center of the punch guide 17 and the axial center of the punch body 41 are held in alignment.

  The punch body 41 is formed with a lubricating oil passage (lubricating oil hole) 83 having one end communicating with the lubricating oil hole 65 and the other end opened to the outer peripheral surface of the punch body 41. A vertical lubricating oil groove 85 communicating with the lubricating oil hole 83 is formed on the outer peripheral surface of the punch body 41, and a circumferential groove 87 communicating with the lubricating oil groove 85 is formed. . Therefore, lubrication between the inner peripheral surface of the punch guide 17 and the outer peripheral surface of the punch body 41 is performed by the lubricating oil (oil mist) supplied through the through hole 43H in the adjusting screw member 43.

  The punch guide 17 is formed with a communication hole 89 (see FIG. 2) in the radial direction (radial direction) communicating with the lubricating oil groove 85. A vertical lubricating oil passage 91 connected to the communication hole 89 is formed on the outer peripheral surface of the punch guide 17, and the outer peripheral surface of the punch guide 17 is provided at both upper and lower ends of the lubricating oil passage 91. The circumferential grooves (lubricating oil passages) 93U and 93L formed in the above are communicated. The upper circumferential groove 93U is provided above the key grooves 61A and 61B, as is apparent from FIG.

  Accordingly, the lubricating oil is supplied between the inner peripheral surface of the punch mounting hole 5 and the outer peripheral surface of the punch guide 17 in the punch holder 3. When the punch die 1 is raised by the lifter spring 7, the upper circumferential groove 93 </ b> U has a wall portion 95 on the punch mounting hole 5 side of the lifter spring accommodation hole 9 as shown in FIG. 1. The upper circumferential groove 93U and the lifter spring accommodation hole 9 are in communication with each other. When the punch die 1 is lowered by a striker (ram) ST provided in the punch press so as to be movable up and down, the upper circumferential groove 93U is lowered from the upper surface of the wall portion 95, and the lifter spring accommodating hole 9 It is provided at a height position where communication with is blocked. That is, the upper circumferential groove 93 </ b> U is provided so as to be able to communicate with the lifter spring accommodating hole 9.

  On the lower surface of the punch body 41, a circular engaging recess 97 opened downward is formed in order to attach the punch tip 77. A radial key 99 having an end located near the opposed position of the outer peripheral surface of the punch body 41 is integrally attached to the ceiling of the engagement recess 97. In addition, although the said key 99 is illustrated with two, it can also be set as one continuous structure. The diameter of the engaging recess 97 is formed to be larger than the diameter of the punch driver 31 in the same manner as the engaging recess 69 formed on the upper surface of the punch body 41.

  A disc-shaped punch tip body 103 provided in the punch tip 77 provided with the punch blade portion 101 at the lower end is detachably fitted and engaged with the engagement recess 97. More specifically, as shown in FIG. 4, the punch tip 77 includes a disc-shaped punch tip body 103, and the punch blade portion 101 having various shapes is formed on the lower surface of the punch tip body 103. It is provided as a unit. A screw hole 105 for screwing a removal tool (not shown), for example, is formed on the lower surface of the punch blade 101 when the punch tip 77 is removed from the engagement recess 97. Further, a radial key groove 107 that can be engaged with the key 99 is formed on the upper surface of the punch tip body 103, and a screw hole 103H that engages with the mounting screw 79 is formed in the shaft core portion. Is formed.

  Further, a part of the punch tip body 103 is provided with a direction restricting portion 109 for keeping the directionality of the punch tip 77 with respect to the punch body 41 constant without error even when being attached or detached. More specifically, the punch tip body 103 is formed with a recess 113 that engages with the head of a fixture 111 such as a mounting bolt to which the key 99 is attached. Therefore, when the punch tip body 103 of the punch tip 77 is engaged with the engagement recess 97 of the punch body 41, the directivity of the punch tip 77 is always regulated in a certain direction.

  Then, when the punch tip body 103 of the punch tip 77 is fitted and engaged with the engagement recess 97 of the punch body 41, the engagement core 97 and the punch tip 77 are aligned with each other so that the axial center of the punch body 77 is aligned. The inner peripheral surface of the mating recess 97 and the outer peripheral surface of the punch tip body 103 are in close contact with each other. As described above, when the punch tip body 103 of the punch tip 77 is fitted and engaged with the engaging recess 97, the key 99 provided in the punch body 41 engages with the key groove 107 of the punch tip body 103, thereby punching the punch tip. The rotation about the axis of 77 is restricted. At this time, since the key 99 is engaged in the vicinity of both end portions of the key groove 107, for example, a slight rotation is restricted as compared with the case where the key 99 is one, and the punch body Thus, the directionality of the punch blade portion 101 with respect to 41 can be held with higher accuracy.

  Since the relationship between the key 99 and the key groove 107 is relative, the punch chip 77 may be provided with the key 99 and the punch body 41 may be provided with the key groove 107.

  The plate press holder 71 is provided with a plate press 115 corresponding to the shape of the punch blade portion 101 in the punch tip 77. Since this type of plate presser holder 71 has a known configuration, a description of a more detailed configuration of the plate presser holder 71 is omitted.

  In the above configuration, when the punch die 1 is mounted in the punch mounting hole 5 in the punch press (the state shown in FIG. 1), when the striker ST in the punch press is lowered and the punch head 33 is struck, first, the lifter The punch die 1 as a whole is lowered against the urging force of the elastic member 15 in the spring 7. When the plate retainer 115 presses and fixes the plate-like workpiece (not shown) on the die (not shown) to the die, the punch driver 31, the punch body 41, The punch tip 77 and the like are lowered, and the workpiece is punched by the punch blade portion 101 of the punch tip 77.

  When punching is performed as described above, oil mist is ejected from the hole H provided in the striker ST, the hole 33H provided in the punch head 33, the through hole 43H provided in the adjustment screw member 43, the lubricating oil passage 65, 83, 91, etc., are guided to the upper and lower peripheral grooves 93U, 93L on the outer peripheral surface of the punch guide 17, and at this time, when the punch die 1 is lowered, the upper peripheral groove 93U is formed in the lifter spring accommodating hole 9. And is in a blocked state.

  Accordingly, lubrication is performed by supplying oil mist between the inner peripheral surface of the punch guide 17 and the outer peripheral surface of the punch body 41 and between the outer peripheral surface of the punch guide 17 and the inner peripheral surface of the punch mounting hole 5. It can be done. When the striker ST is raised and the punch die 1 is being raised by the lifter spring 7 and the striker ST is in contact with the punch head 33, and when the striker ST is in contact with the punch head 33. In the initial state in which the punch head 33 is lowered, that is, the striker ST and the punch head 33 are in contact with each other, an upper circumferential groove 93U formed on the outer peripheral surface of the punch guide 17 is formed in the lifter spring accommodating hole 9. When in communication, oil mist is supplied from the upper circumferential groove 93U into the lifter spring accommodating hole 9.

  Therefore, lubrication between the bolt (guide member) 11 and the lifter ring 13 is performed, and the lifter ring 13 is always smoothly moved up and down. Therefore, even when the punching process for the workpiece is repeated at a high speed, the follow-up operation of the punch mold 1 is not delayed with respect to the vertical movement of the striker ST. Also, oil mist is supplied to the elastic member 15.

  As described above, when the punch head 33 is lowered by the striker ST, the taper portion 39T of the punch driver 31 is detached from the taper hole 29T of the retainer collar 27, but when the lift head is restored, the taper portion 39T and the taper hole 29T are engaged again. Is. Accordingly, the retainer collar 27 and the punch driver 31 are aligned each time.

  The high-precision fitting hole 47 of the punch driver 31 and the high-precision fitting portion 51 of the adjustment screw member 43 are fitted and engaged with high accuracy, and the fitting engagement portion 57 of the adjustment screw member 43 and The adjustment screw member 43 and the axial center of the punch body 41 are fixed and matched in advance by engaging and fixing the engagement recess 69 of the punch body 41, and the taper portion 39T and the taper. Combined with the engagement with the hole 29T, the axial center of the punch guide 17 and the axial center of the punch body 41 are always kept in a state of being accurately aligned.

  At this time, since the tapered hole 29T is provided in the retainer collar 27 and the tapered portion 39T is provided at the lower part of the punch driver 31, an automatic alignment function can be provided close to the upper part of the punch body 41, The axial alignment of the punch body 41 with respect to the punch guide 17 can be effectively performed. In other words, the axial center of the punch tip 77 can be held in a state where it exactly coincides with the axial center of the punch guide 17, and high-precision punching can be performed. Further, the slight inclination of the punch body 41 with respect to the punch guide 17 can be suppressed, and the galling phenomenon can be suppressed.

  Further, in the above-described configuration, the punch tip body 103 in the punch tip 77 has a disk shape larger in diameter than the outer diameter of the punch driver 31, so that a component force in the left-right direction acts on the punch blade 101 in FIG. In this case, a component force is received in the vicinity of the left and right peripheral edges in FIG. 1 in the punch tip body 103, and the minute inclination of the punch tip 77 can be effectively prevented. Further, in FIG. 2, when an upward force is applied near the left and right end portions of the punch blade portion 101, it is received by the outer peripheral edge portion of the punch tip body 103 corresponding to the vicinity of the left and right end portions of the punch blade portion 101. As a result, the fine tilt of the punch tip 77 can be effectively prevented.

  That is, according to the above-described configuration, the axial center of the punch body 41 and the axial center of the punch tip 77 can always be held in an exact match, and a highly accurate punching process can always be performed. .

  The present invention is not limited to the embodiment as described above, and can be implemented in other forms by making appropriate changes. That is, the outer peripheral surface of the punch tip body 103 in the engagement recess 97 formed in the lower surface of the punch body 41 and the punch tip 77 so that the centering (centering) of the punch body 41 and the punch tip 77 can be easily performed. It is also possible to make it into a taper shape that can be freely engaged and disengaged.

1 Punch Die 5 Punch Mounting Hole 7 Lifter Spring 9 Lifter Spring Housing Hole 11 Bolt (Guide Member)
13 Lifter Ring 15 Elastic Member 17 Punch Guide 19 Supported Part 25 Inner Flange 27 Retainer Collar 29 Lower Projection 29T Taper Hole 31 Punch Driver 33 Punch Head 35 Stripper Spring (Elastic Member)
39 Flange portion 39T Taper portion 41 Punch body 41U Upper end surface 41L Lower end surface 43 Adjustment screw member 45 Female screw portion 47 High-precision fitting hole portion 49 Male screw portion 51 High-precision fitting portion 57 Inserting engagement portion 61A, 61B, 107 key Groove 63A, 63B Key 65 Lubricating oil hole (lubricating oil passage)
69, 97 Engaging recess 77 Punch tip 79 Mounting screw 83 Lubricating oil passage (lubricating oil hole)
85 Lubricating oil groove 89 Communication hole 91 Lubricating oil path 93U, 93L Circumferential groove (lubricating oil path)
95 Wall 101 Punch Blade 103 Punch Tip Body 109 Direction Restriction 111 Mounting Tool 113 Recess

Claims (1)

  A cylindrical punch guide has a punch body with a punch blade at the lower end, which can be moved up and down, and a retainer collar provided at the upper part of the punch guide at the upper end of the punch driver that passes through the punch guide. A stripper spring is elastically mounted between the punch head and the retainer collar, and an adjustment screw member provided integrally or integrally with the upper portion of the punch body is provided above and below the female screw portion provided in the punch driver. A punch die that is screwed so as to be adjustable, and includes a taper portion that is fitted to a downwardly widened taper portion formed at a lower portion of the retainer collar at a lower portion of the punch driver, and is below the female screw portion of the punch driver A high-precision fitting hole provided on the lower side of the male screw portion of the adjustment screw member is fitted into and engaged with a high-precision fitting hole provided on the side. Type.

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