JPH10249447A - Punch holding device of press die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely prevent the accident of being carelessly dropped away from a retainer when a select bar is retreated to an unable punching position by installing a stopper to regulate the select bar. SOLUTION: When a select bar 13 is retreated along a 2nd guide groove 51, then a stopper 53 is made in contact with the forward stroke end 51a of the 2nd guide groove 51, and the select bar 13 is regulated to move more than that to the retreating direction. Further, the stopper 53 is made in the state of being in contact with the forward stroke end 51a in the state of a backing plate being detached from a retainer body 4. In this state, by pressing an operating member downward, the select bar 13 is swung so that the top end part is gone upward making the stopper 53 as the swinging fulcrum as the center. Therefore, without being disturbed with the select bar 13, the punch and a spring seat member are detached from the retainer body 4 or attached.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a punch holding apparatus for a press die capable of switching a punch between a punchable position and a non-punchable position.

[0002]

2. Description of the Related Art Some punch holding devices in a press die are capable of switching a punch between a punchable position and a non-punchable position. That is, the punch is slidably held in the axial direction by a retainer attached to the press die, and is urged by a spring toward a non-punching position where the protruding length from the retainer is shortened. Further, there is a device in which a punching position and a non-punching position are switched by changing the length of protrusion of a punch from a retainer by a select bar arranged on the base end face side of the punch (for example, Real fairness 3
No. 4412, Japanese Utility Model Publication No. 4-2609, and Japanese Utility Model Publication No. 55-23283).

[0003]

However, in order to reduce the cost and downsize the select bar, the select bar may be manually moved forward and backward. In this case, it is easy to cause a problem that the select bar is unnecessarily largely retreated when the select bar is retreated, and the select bar is pulled out of the retainer.

The present invention has been made in view of the above circumstances, and it is possible to reliably prevent a situation in which the select bar comes out of the retainer inadvertently when the select bar is manually advanced and retreated. To provide a punch holding device in a press die.

[0005]

In order to achieve the above object, the present invention has a first solution as follows. That is, a retainer body that holds the punch slidably in the axial direction thereof, a spring seat member that is disposed in the retainer body, and that is retained by a large-diameter head of the punch, and that is disposed in the retainer body, A spring acting on the spring seat member to bias the punch toward a non-punchable position; and a spring disposed in a guide groove formed in the retainer main body so as to open on an upper surface of the retainer main body. A select bar that is advanced to and retracted from the back of the large-diameter head of the punch to switch between a punchable position and a non-punchable position, and is detachably attached to an upper surface of the retainer body; A backing plate for covering the member and the select bar from above; and selecting the select bar when the select bar is retracted to a predetermined position where punching cannot be performed. Abuts against the over, some as the select bar is provided with a stopper for regulating the slipping out from the retainer body. Preferred embodiments based on the above solution are as described in claims 2 and 3 in the claims.

In order to achieve the above object, the present invention is as follows as a second solution. That is,

[0007] A retainer body holding the punch slidably in the axial direction thereof, a spring seat member disposed in the retainer body and prevented from falling off by a large diameter head of the punch, and a spring seat member disposed in the retainer body. A spring acting on the spring seat member to urge the punch toward the non-punchable position; and a spring disposed in a first guide groove formed in the retainer main body so as to open on an upper surface of the retainer main body. A select bar that is moved back and forth to the back of the large-diameter head of the punch by operation to switch between a punchable position and a non-punchable position of the punch, and is detachably attached to an upper surface of the retainer main body; A backing plate that covers the spring bar, the spring seat member and the select bar from above, and is formed on one of the side surface of the select bar and the inner surface of the first guide groove. A second guide groove extending in the longitudinal direction of the select bar, and a protrusion-shaped stopper provided on the other of the side surface of the select bar and the inner surface of the first guide groove, and fitted in the second guide groove. And the stopper is adapted to be fitted in the axial direction of the punch, and the select bar is brought closer to the first guide groove from above the retainer main body. A third guide groove for guiding the stopper into the second guide groove, and the stopper is formed only in a position where the punch can be punched. When the select bar is retracted to a predetermined position where the punch cannot be punched out, the stopper comes into contact with the longitudinal end face of the second guide groove, and SEREC Bar that exits from said retainer body is restricted, are so. Preferred embodiments on the premise of the above solution are as described in Claim 5 and the following claims.

[0008]

According to the first aspect of the present invention, when the select bar is retreated to the predetermined position where the punching is disabled, the further retreat of the select bar is restricted by the stopper. It is possible to reliably prevent a situation in which the user accidentally slips out of the retainer.

According to a second aspect of the present invention, the select bar is swung upward when replacing a punch while reducing the total stroke displacement required for the advance and retreat of the select bar, that is, reducing the size as a whole. The punch and the spring seat member can be attached to and removed from the retainer body without being disturbed by the select bar.

According to the third aspect, after the select bar is fitted into the guide groove against the spring, the select bar is slightly retracted so that the select bar can be automatically removed from the retainer body. The operation of fixing the backing plate to the retainer main body can be easily performed in a state where the backing plate is prevented.

According to the fourth aspect, the same effects as those of the first and third aspects can be obtained by utilizing the guide groove and the stopper. According to the fifth aspect, the same effect as the effect according to the second aspect can be obtained by effectively using the stopper.

According to the sixth aspect, the elongated second guide groove can be formed in the form of external surface processing on the side surface of the select bar which can be largely exposed to the outside,
Its formation is easy.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, reference numeral 1 denotes an upper die of a press die, and a punch 3 is held on the upper die 1 via a retainer 2. The retainer 2 has a structure in which a retainer body 4 and a backing plate 5 are divided, and these 4 and 5 are integrally detachably attached to each other by bolts as is known.

A guide hole 7 is formed in the retainer main body 4 and extends vertically. The upper portion of the guide hole 7 communicates with the guide hole 7 and a storage space 8 opened on the upper surface of the retainer main body 4. The storage space 8 is covered with a backing plate 5. In the punch 3, a portion that slides in the guide hole 7 is an intermediate shaft portion 3a, a front end side of the intermediate shaft portion 3a is a punching portion 3b, and an upper part of the intermediate shaft portion 3a is a part of the intermediate shaft portion 3a. Is also a large diameter head 3c having a slightly larger diameter.

The intermediate shaft portion 3a of the punch 3 has a storage space 8
The spring seat member 9 is fitted in the large-diameter head 3.
c prevents this from coming off. In the retainer main body 4, a plurality (three in the embodiment) of spring storage recesses 10 extending in the vertical direction are formed at substantially equal intervals in the circumferential direction of the punch 3 so as to open to the bottom wall of the storage space 8. The upper end of the return spring 11 disposed in each spring accommodating recess 10 is in contact with the lower surface of the spring seat member 9, whereby the punch 3 is constantly urged upward.

An elongated first guide groove 12 is formed on the upper surface of the retainer main body 4 so as to extend substantially in the diameter direction of the punch and communicate with the storage space 8.
Is also covered with a backing plate 5. First
A select bar (also referred to as a moving backing plate) 13 is slidably fitted in the guide groove 12. The lower surface of the distal end of the select bar 13 has a tapered inclined surface 13 that is inclined away from the large-diameter head 3c of the punch 3 as it goes upward in the axial direction of the punch 3.
a. An operation member 26 gripped during manual operation is fixed to the base end of the select bar 13.

In the state shown in FIG. 1, the select bar 13 is advanced to the back of the large-diameter head 3b of the punch 3, and the punch 3 is set at a punchable position where the protruding length of the punch 3 from the retainer 2 is increased. From the state shown in FIG. 1, by gripping the operation member 26 and pulling the select bar 13, the select bar 13 is withdrawn from the back surface of the large-diameter head 3 b of the punch 3, and the punch 3 is displaced upward by the spring 11, that is, the retainer. The projecting length from the position 2 is shortened to the punching impossible position shown in FIG.

At the non-punching position shown in FIG. 4 where the select bar 13 has been withdrawn to a predetermined position, the select bar 13
The large-diameter head 3c of the punch 3 in the axial direction of the punch 3.
, But is positioned within the extended locus of the spring seat member 10. That is, the retainer 2
When the backing plate 5 is removed from the retainer main body 4 and the punch 3 and the spring seat member 9 are pulled upward from the retainer main body 4,
In this state, the spring seat member 9 interferes with the select bar 13.

However, the select bar 13 is
As shown by, the tip of the swing bar is swung about the swing fulcrum α so that the tip thereof is directed upward, thereby selecting the select bar 1.
The tip end of the spring 3 is deviated from the extension trajectory of the spring seat member 9 in the axial direction of the punch, and the punch 3 can be pulled upward together with the spring seat member 9 from the retainer main body 4 without being disturbed by the select bar 13. Become. The select bar 13
Can be made to retreat sufficiently backward to a position where it does not interfere with the spring seat member 9, but in this case, the necessary displacement of the select bar 13 becomes large, and in FIG. Would be large overall.

The select bar 13 can be fitted into the guide groove 12 only at the punching possible position, further restricting the select bar 13 from retreating from a predetermined position, and as described above. In the state of being retracted to the predetermined position, it can swing upward about the swing fulcrum α. Hereinafter, an example for obtaining such a function will be described with reference to FIGS.

First, on one side surface of the select bar 13, there is formed a second guide groove 51 elongated in the longitudinal direction thereof, and a third guide groove 5 extending short in the axial direction of the punch.
2 are formed. The third guide groove 52 is provided at the rear end of the second guide groove 51, that is, at the operation member 26 side.
It communicates with the guide groove 51. Guide grooves 51 and 55
2 are almost the same. The second guide groove 51 has a shape that is closed in a ring shape as a whole except for a portion communicating with the third guide groove 52, and its front stroke end is denoted by reference numeral 51a and its rear stroke end is indicated by reference numeral 51a. This is indicated by reference numeral 51b.

On the other hand, the retainer body 4 is provided with a stopper 53 on the inner surface of the first guide groove 12. The stopper 53 is formed of a spring plunger as shown in FIG. That is, the plunger as the stopper 53 is slidably fitted into the mounting hole 55 formed in the retainer main body 4 so as to open to the side surface of the first guide groove 12. Are always urged so as to protrude by a predetermined amount toward. The tip of the stopper 53 is provided in the second guide groove 51.
The size is such that it can be loosely fitted in the third guide groove 52. The stopper 53 is provided near the rear end of the retainer main body 4, that is, at a position close to the operation member 26. The urging force of the spring 54 is adjusted by a screw 56 screwed into the mounting hole 55.

The position where the third guide groove 52 can be fitted to the stopper 53 is only when the select bar 13 is at the punchable position shown in FIG. With the backing plate 5 removed from the retainer body 4 (punch 3,
The spring seat member 9, the spring 11, and the like are incorporated in the retainer main body 4 in advance), and the select bar 13 is pressed downward against the spring 11 while aligning the third guide groove 52 with the stopper 53. As a result, the stopper 53 is fitted into the second guide groove 51 from the third guide groove 52, and the select bar 13 is entirely
It is fitted in the guide groove 12.

Thereafter, when the select bar 13 is slightly displaced in the retreating direction, the stopper 53 is moved to the third guide groove 5.
2 is engaged with the second guide groove 51 at a position deviating therefrom, and even when the backing plate 5 is removed, unintentional removal of the select bar 13 from the first guide groove 12 is restricted. Is done.

When the select bar 13 is retracted along the second guide groove 51, the stopper 53 comes into contact with the front stroke end 52a of the second guide groove 51, and the select bar 13 further moves in the retreat direction. The movement is restricted (removal of the select bar 13 from the retainer body 4 corresponding to FIG. 4).

As shown in FIG. 5, the backing plate 5
Is in a state where the stopper 53 is in contact with the front stroke end 51a as described above in a state where is removed from the retainer main body 4. In this state, by pressing the operation member 26 downward, the select bar 13 is swung about the stopper 53 as the swing fulcrum α so that the tip end thereof is directed upward. Thus, the punch 3 and the spring seat member 9 can be removed from the retainer body 4 and attached without being disturbed by the select bar 13.

In FIG. 2, reference numeral 41 denotes a retainer 2
Reference numeral 42 denotes a mounting hole for a positioning pin for positioning the (retainer main body 4) with respect to the upper die 1, 42 denotes a bolt insertion hole for fixing the retainer 2 (retainer main body 4) to the upper die 1, 43 Reference numeral denotes a bolt hole for fixing the backing plate 5 to the retainer body 4. Holes corresponding to the holes 41 to 43 are also formed in the backing plate 5, but the holes 41A corresponding to the positioning holes 41 are fool holes and do not participate in positioning.

FIGS. 11 to 13 show another embodiment of the present invention, in which the same components as those shown in FIG. 10 are denoted by the same reference numerals. In this example, select bar 1
When the spring 3 is in the retracted position, the spring seat member 9 is slightly displaced downward against the spring 11 so that the select bar 13 can be easily displaced toward the advanced position. . That is, when a pin-shaped pressing projection member 61 such as a spring pin is attached to the backing plate 5 so as to project from the lower surface thereof, and the backing plate 5 is fixed to the retainer body 4,
The spring seat member 9 is slightly pressed downward by the projection member 61. Of course, the projection member 61 is provided at a position that does not interfere with the select bar 13.

FIGS. 14 to 17 show an example in which the work of positioning the punch 3 with respect to the upper die 1 can be easily performed. In particular, the punching portion 3b of the punch 3 has a circular cross section. (Punch 3 is not performed in the circumferential direction). That is, an intermediate member 70 for positioning is separately provided for the backing plate 5.

The intermediate member 70 includes a first portion 72 having a large diameter,
A second portion 73 having a small diameter protruded upward from the center of the upper surface of the first portion 71, and a positioning hole 73 is formed in the center of the second portion 72. The outer peripheral shape of the first portion 71 is set to be circular and concentric with the positioning hole 73 and to have a relationship of a predetermined dimensional accuracy.

On the other hand, the upper inner surface 8a of the storage space 8 communicating with the guide hole 7 in which the punch 3 is fitted is circular,
The guide hole 7 is set so as to be concentric with the axis of the punch 3 and to have a predetermined dimensional accuracy.
The first portion 71 is tightly fitted to the upper inner surface 8a, whereby the positioning hole 73 of the intermediate member 71 is positioned with respect to the axis of the punch 3.

The second portion 72 is loosely fitted into a through hole 74 formed in the backing plate 5, and the positioning hole 73 faces the lower surface of the upper mold 1. In correspondence with the positioning holes 73, the upper die 1 is provided with positioning holes 7 in advance.
6 are formed, and both positioning holes 73 and 76 are formed.
The positioning pin 77 is tightly fitted over the upper mold 1 so that the positioning hole 7
Position 3 is positioned. In this manner, the positioning of the axis of the punch 3 with respect to the upper mold 1 is performed by the positioning hole 76, the positioning pin 77, the positioning hole 73, the (outer periphery) of the first portion 71, the (upper inner surface 8a of) the storage space 8, and the guide. This is performed through the dimensional relationship of the holes 7.

The intermediate member 70 is fixed to the backing plate 5 in advance, and a screw hole for this is indicated by reference numeral 75. The backing plate 5 is inserted so that the first portion 71 of the intermediate member 70 is fitted to the upper inner surface 8a of the storage space 8.
Is fixed to the retainer body 4. Thereafter, for example, the positioning pins 77 press-fit into the positioning holes 73 in advance.
May be fitted into the positioning hole 76 of the upper mold 1. An escape space 78 for the select bar 13 is formed in the bottom of the first portion 71 in the form of a groove.

Although the embodiment has been described above, the present invention is not limited to this and includes, for example, the following case. The second guide groove 51 (third guide groove 52) may be formed on the retainer body 4 side, that is, on the inner surface of the first guide groove 12, while the stopper 53 may be provided on the select bar 13. Further, a pair of left and right guide grooves 51 (52) and stoppers 53 may be provided with the select bar 13 interposed therebetween.

The stopper 53 may be formed as an integral pin member as a whole. That is, in FIG. 10, the stopper 53 (plunger) and the screw 56 may be integrated and screwed into the mounting hole 55 (in this case, the spring 54 is unnecessary). Note that the tip of the stopper 53 (the second guide groove 51)
By setting the cross section of the portion (fitted into the inside) to be circular, it is preferable to ensure the smooth swinging of the select bar 13 as shown in FIG.

FIGS. 11 to 13 show that the uppermost height position of the large diameter head 3c of the punch 3 at the non-punching position is
This is to facilitate the displacement of the select bar 13 from the retreat position to the advance position by setting the select bar 13 to a height position in the middle of the inclined surface 13a. In order to do this, instead of using the projection 61, a clearance groove into which the upper part of the select bar 13 is fitted is formed on the lower surface of the backing plate 5, and the position of the select bar 13 is set in FIG. May be positioned slightly upward as a whole from the state shown in FIG. In this case, the escape groove is provided on the select bar 1.
3 is formed to have a length corresponding to the total displacement amount, and the width of the select bar 13 (escape groove) is set to the large diameter head 3c of the punch 3.
(The large-diameter head portion 3c abuts on the opening edge of the clearance groove to restrict further upward displacement, and the select bar is increased by the depth of the clearance groove. 13 is made higher than the upper surface of the large diameter head 3c).

The object of the present invention is not limited to what is explicitly specified, but also implicitly includes providing what is described as substantially preferred or advantageous.

[Brief description of the drawings]

FIG. 1 shows one embodiment of the present invention, and is a side sectional view when a punch is at a punchable position.

FIG. 2 is a top view when the backing plate is removed from the state of FIG.

FIG. 3 is a plan view showing a backing plate.

FIG. 4 is a side sectional view corresponding to FIG. 1 and showing a state in which the punch is in a non-punchable position.

FIG. 5 is a side sectional view showing a state where the backing plate is removed from the state of FIG. 4 and the select bar is swung.

FIG. 6 is a side view showing a guide groove formed in the select bar.

FIG. 7 is a bottom view of FIG. 6;

FIG. 8 is a cross-sectional view corresponding to line X8-X8 in FIG. 6;

FIG. 9 is a sectional view corresponding to line X9-X9 in FIG. 6;

FIG. 10 is an enlarged sectional view of a main part showing an engagement relationship between a guide groove and a stopper.

FIG. 11 shows another embodiment of the present invention, and is a plan view of a backing plate.

FIG. 12 is a view showing a spring pin used in FIG. 11;

FIG. 13 is a sectional view of a main part showing a state when the backing plate shown in FIG. 11 is fixed to a retainer main body.

FIG. 14 is a sectional view of a main part showing still another embodiment of the present invention.

FIG. 15 is a bottom view of the intermediate member used in FIG. 14;

FIG. 16 is a side view of FIG.

FIG. 17 is a side view of FIG. 15, viewed from a direction shifted by 90 degrees from FIG. 16;

[Description of sign]

 1: Upper die 2: Retainer 3: Punch 4: Retainer body 5: Backing plate 7: Guide hole 8: Storage space 9: Spring seat member 11: Return spring 12: First guide groove 13: Select bar 26: Operating member 51: Second guide groove 51a: Stroke end 51b: Stroke end 52: Third guide groove 53: Stopper (oscillation center) α: Oscillation center

Claims (6)

[Claims] 1. A retainer body holding a punch slidably in the axial direction thereof; a spring seat member disposed in the retainer body and prevented from falling off by a large diameter head of the punch; A spring that acts on the spring seat member to urge the punch toward a non-punchable position; and a spring that is disposed in a guide groove formed in the retainer main body so as to open on the upper surface of the retainer main body. A select bar that is advanced and retracted to the back of the large-diameter head of the punch by an operation to switch between a punchable position and a punch-out position, and the punch is detachably attached to an upper surface of the retainer main body. A backing plate covering the spring bar, the spring seat member and the select bar from above, and a backing plate when the select bar is retracted to a predetermined position where punching cannot be performed. Abuts against the Kutoba,
A punch holding device for a press die, comprising: a stopper for preventing the select bar from coming out of the retainer main body. 2. The method according to claim 1, wherein when the select bar is retracted to the predetermined position,
The tip of the select bar is set so as to be located on the extension trajectory of the spring seat member in the direction of the punch axis, and in a state where the select bar is retracted to the predetermined position, the backing plate is removed. A rocking mechanism is provided that prevents the tip of the select bar from swinging upward while preventing the select bar from coming out of the guide groove upward even in the detached state, When the select bar is retracted to the predetermined position with the backing plate removed from the retainer main body, the select bar is swung so that the distal end thereof is directed upward, thereby selecting the select bar. The punch holding device in the press die, wherein a tip end of the punching die is deviated from an extension locus of the spring seat member in the direction of the punch axis. 3. The press die according to claim 1, wherein the select bar can be fitted into the guide groove from above only at a punchable position of the punch. Punch holding device. 4. A retainer body for holding a punch slidably in the axial direction thereof, a spring seat member disposed in the retainer body and prevented from falling off by a large-diameter head of the punch, and A spring that acts on the spring seat member and urges the punch toward a non-punchable position; and a spring that is disposed in a first guide groove formed in the retainer body so as to open on an upper surface of the retainer body. A select bar for switching between a punchable position and a non-punchable position of the punch by being manually moved back and forth to the back of the large-diameter head of the punch, and detachably attached to the upper surface of the retainer body; A backing plate that covers the punch, the spring seat member, and the select bar from above, and is formed on one of a side surface of the select bar and an inner surface of the first guide groove. A second guide groove extending in the longitudinal direction of the select bar, and a protrusion formed on the other of the side surface of the select bar and the inner surface of the first guide groove and fitted in the second guide groove. And the stopper is formed so as to communicate with the second guide groove, and the stopper can be fitted from the axial direction of the punch, so that the select bar approaches the first guide groove from above the retainer main body. A third guide groove for guiding the stopper into the second guide groove when the stopper is formed, and the stopper is formed in the third guide groove only when the punch is at a punchable position. The stopper is brought into contact with the longitudinal end face of the second guide groove when the select bar is retracted to a predetermined position where the punch cannot be punched out. , A punch holding device for a press die, wherein a rect bar is prevented from coming out of the retainer main body. 5. The select bar according to claim 4, wherein when the select bar is retracted to the predetermined position, the select bar is swingable upward about a center of the stopper. When the bar is withdrawn to the predetermined position,
The select bar is set such that the tip of the select bar is located on the extension trajectory of the spring seat member in the direction of the punch axis. When the backing plate is removed from the retainer main body, the select bar moves to the predetermined position. When the selector bar is retracted, the select bar is swung about the stopper so that the distal end of the select bar is directed upward, so that the distal end of the select bar moves in the direction of the punch axis of the spring seat member. A punch holding device for a press die, wherein the punch holding device is deviated from an extended locus of the punch die. 6. The press metal according to claim 5, wherein the second guide groove and the third guide groove are respectively formed on side surfaces of the select bar, and the stopper is provided on the retainer main body. Address holding device in the mold.