JPH0123626Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a punch die in a punch press machine such as a turret punch press.

A punch mold generally includes a punch guide for attaching the punch to the punch holder, a punch body inserted into the punch guide so as to be able to move up and down, and a punch body for strongly pushing the punch body upward against the punch guide. It is composed of a stripper spring. In such a punch die, there is a problem in that it is economically wasteful to replace the entire punch die just because the punch tip is severely damaged.

Therefore, there is a punch mold having a structure in which a punch tip is detachably attached to a punch body. However, in the conventional configuration, the attachment of the punch tip to the punch body tends to loosen due to intense vibration during punching, and there are also problems in that attaching and removing the punch tip to the punch body and replacing it is quite troublesome.

This invention was made in view of such conventional problems, and provides a punch die that prevents the fixation of the punch tip from loosening with respect to the punch body and allows the punch tip to be easily replaced. The purpose is to

The embodiment shown in the figures will be explained in detail below. 1st
The figure shows the whole of a general turret punch press in which the punch die according to the invention can be used. This turret punch press 1 grips a workpiece on a work table 3 with a clamp device 5, moves the work two-dimensionally in the XY direction with a workpiece rubble 3 and a clamp device 5, and punches a desired portion onto an upper turret 7. and the lower turret 9, and punch the punch 1 into the desired shape with the striking member 11.
By striking the head portion of 3, a desired shape is punched out between the punch 13 and the die 15 of the lower turret 9.

An embodiment of a punch mold used in such a turret punch press 1 is shown in FIGS. 2 and below. In the embodiments shown in FIGS. 2 to 5, the punch body 19 of the punch die 13 is installed in the cylindrical punch guide 17 inserted into the upper turret 7 in FIG. The condition is shown. A punch head 21 is attached to the upper end of the punch body 19, and a guide collar 2 is attached to the upper end of the punch guide 17.
A strong stripper spring 25 is interposed between the punch body 19 and the punch body 19, and after the punch head 21 is pressed by the striker 11 and punched as described above, the punch body 19 is pulled back upward by a strong force. ,
The punch body 19 is separated from the workpiece. A lift spring 27 is provided between the lower surface of the flange at the upper end of the punch guide 17 and the upper turret 7, so that the entire punch die 13 is always kept at a constant height.

Now, the punch body 19 of this punch mold 13.
A tip insertion hole 29 is formed in the lower end surface of the punch tip 31.
The insertion tube is inserted. The punch body 1
A groove 33 is formed on the outer peripheral surface of the screw 3, and a locking member 35 such as a leaf spring is inserted into the groove 33.
It is attached by 7. Further, a male threaded portion 39 is provided on the outer peripheral surface of the lower end portion of the punch body 19. The distal end of the locking member 35 engages with a recess 43 as a locking portion formed at the end of a fixing nut 41 that is screwed into the male threaded portion 39 . Further, in this embodiment, the punch body 19 has a notch 4 deeper in the groove 33 for attaching and detaching the punch tip 31, as will be described later.
For example, as shown in FIG. 5, the distal end of the locking member 35 can be pushed into this deep notch 45 using a screwdriver D, or pulled as appropriate to separate it from the recess 43. However, the fixing nut 41 can be freely rotated relative to the male threaded portion 39.

A direction regulating member 47, such as a washer, having directionality is attached to the body of the punch tip 31, and is prevented from rotating by a rotation stopper pin 49. And this punch chip 3
A recess 51 having a directionality into which the first direction regulating member 47 is fitted is formed on the lower end surface of the punch body 19, and the fixing nut 41 has a passage hole 53 through which the direction regulating member 47 passes through. It is formed.

When attaching the punch tip 31 to the punch body 19 in the punch die 13 having the above configuration, the fixing nut 41 is loosened relative to the male threaded portion 39, and the passage hole 53 is aligned with the recess 51 of the punch body 19 in the direction. Make them match. Next, the punch tip 31 with the direction regulating member 47 attached is passed through the passage hole 53 of the fixing nut 41 and the punch body 1 is inserted.
9 into the chip insertion hole 29, and the direction regulating member 47 is engaged with the recess 51. Then, the fixing nut 41 is tightened to fix the direction regulating member 47 of the punch tip 31 in a state where it is engaged with the recess 51 of the punch body 19. At this time, the directionality of the recess 51 of the punch body 19 and the passage hole 5 of the fixing nut 41 are determined.
3, the tip of the locking member 35 is engaged with the locking recess 43 to stop the fixing nut 41 from rotating;
The punch tip 31 is fixed so that it does not come off.

Conversely, when removing the punch tip 31 from the punch body 19 for replacement, use a screwdriver D to push the tip of the detent locking member 35 into the deep notch 45, as shown in FIG. Then, the fixing nut 41 is disengaged from the locking recess 43, and the fixing nut 41 is loosened. Then, in a state where the direction of the passage hole 53 of the fixing nut 41 and the direction of the recess 51 of the punch body 19 match, the punch tip 31 is moved by passing the direction regulating member 47 of the punch tip 31 through the passage hole 53. The punch tip is detached from the punch body 19 and replaced with another punch tip.

6 to 8 show a punch die 13 as a reference example, in which a punch body 55 and a punch tip 57 which can be attached to, detached from, and replaced can freely slide up and down with respect to the punch guide 17.
The structure of punching a workpiece by striking a punch head (not shown) attached to the upper end of the punch body 55 by the punch body 55 is the same as that of the first embodiment. The feature of this reference example is that the punch tip 57 is attached to the punch body 55.
The lower end of the punch body 55 has a narrow diameter portion 59, and a hole 61 for inserting a punch tip is formed inside. A through hole 65 for accommodating a ball 63 is formed in this narrow diameter portion 59.
Furthermore, an eccentric collar 67 is provided on the outer periphery of this narrow diameter portion 59.
is rotatably mounted. This eccentric collar 6
7 has an elliptical inner circumferential surface and has a long axis and a short axis, with the short axis being approximately equal to the outer diameter of the narrow diameter portion 59. Further, a notch 71 is formed slightly above the narrow diameter portion 59 of the punch body 55 for mounting a leaf spring 69 as an example of a detent locking member. A notch 73 is formed. The distal end portion of the detent leaf spring 69 is bent into an L-shape, and the bent end portion 69a can be freely engaged with a recess 75 as a locking portion formed on the end surface of the eccentric collar 67.

The punch tip 57 is provided with a locking through hole 77 in the diametrical direction in which the ball 63 engages. In addition, regarding the eccentric collar 67, a snap spring 79 is attached to the narrow diameter portion 59 to prevent it from coming off.
is provided.

In the reference example of the punch mold having the above configuration, when attaching the punch tip 57 to the punch body 55, the eccentric collar 67 is first rotated to connect the through hole 65 of the narrow diameter portion 59 of the punch body 55 with the eccentric collar 6.
A gap is formed between the ball 63 and the ball 63 so that the ball 63 becomes free. In this state, insert the punch tip 57 into the punch body 55.
The eccentric collar 67 is inserted into the insertion hole 61 so that the through holes 65 and 77 match, and the eccentric collar 67 is rotated in this state. By performing this operation, the short axis side of the eccentric collar 67 exactly aligns with the axis of the through hole 77 and pushes the ball 63 inward, as shown in FIG. ball 63
A part of the punch tip 57 is engaged to prevent the punch tip 57 from coming off. In this state, the anti-rotation leaf spring 6
9 is the bent end 69 as shown in FIGS. 7 and 8.
a engages with the locking recess 75 of the eccentric collar 67,
The eccentric collar 67 is prevented from rotating.

When removing the punch tip 57 from the punch body 55, use a screwdriver to push the detent leaf spring 69 into the deep notch 73 of the punch body 55, as in the first embodiment, so that the bent end 69a is attached to the eccentric collar. 67 locking recess 7
5 is disengaged so that the eccentric collar 67 can be rotated, and then the eccentric collar 67 is rotated so that the long axis side comes toward the ball 63 to free the ball 63, and the punch tip 57 is pulled out. be.

As can be understood from the above description of the embodiments, the gist of the present invention is as stated in the claims of the utility model registration. The provided direction regulating member 47 engages with the recess 51 of the punch body 19, and the punch body 19 and the punch tip 3
The directionality with respect to 1 is always maintained accurately. Also, when attaching the punch tip 31 to the punch body 19, the recess 5 of the punch body 19
1 and the directionality of the passage hole 53 of the fixing nut 41 do not match, the tip of the detent locking member 35 engages with the locking recess 43 of the fixing nut 41, and the fixing nut 41 Since the punch tip 31 is prevented from rotating, it will not loosen due to vibration or the like, and the punch tip 31 will not fall off.

Furthermore, the punch tip 31 can be attached or detached by appropriately turning the fixing nut 41 without attaching or detaching the fixing nut 41 to or from the punch body 19. Since this is done by matching the directionality, the punch tip 31 can be easily and quickly replaced.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a turret punch press used in an embodiment of this invention, Fig. 2 is a sectional view of an embodiment of this invention, and Fig. 3 shows the punch body and fixing nut of the same embodiment. FIG. 4 is a perspective view of the punch tip of the same embodiment as above, FIG. 5 is a sectional view of the attachment part of the detent leaf spring of the above embodiment, FIG. 6 is a sectional view of a reference example, and FIG. FIG. 8 is a partially cutaway front view of the lower end portion of the punch body same as above, and FIG. 8 is a sectional view taken along the line -- in FIG. 7. 13...Punch mold, 17...Punch guide,
19... Punch body, 29... Chip insertion hole, 31... Punch tip, 33... Groove, 35
... Rotation locking member, 39 ... Male threaded part, 41
... Fixing nut, 43 ... Locking recess, 47 ...
Direction regulating member, 51... recess.

Claims (1)

[Scope of utility model registration request] A tip insertion hole 29 is provided in the lower end surface of the punch body 19 that is vertically movably inserted into the punch guide 17, and the insertion portion of the punch tip 31, which has an insertion portion that can be freely engaged and detached from the tip insertion hole 29, has a directionality. In a punch die in which a direction regulating member 47 is provided and an insertion portion of a punch tip 31 is inserted into the tip insertion hole 29, the direction regulating member 47 is engaged with a recess 51 formed on the lower end surface of the punch body 19. A fixing nut 41 for fixing the punch tip 31 to the punch body 19 is screwed onto the lower end of the punch body 19, and a passage hole 53 through which the direction regulating member 47 can pass is provided at the bottom of the fixing nut 41. The distal end of the detent locking member 35 whose base is installed in the groove 33 provided on the outer circumference of the punch body 19 is such that the directionality of the recess 51 of the punch body 19 and the directionality of the passage hole 53 of the fixing nut 41 do not match. A punch mold characterized in that a locking recess 43 is provided at the end of the fixing nut 41, and the locking recess 43 can be freely engaged and detached when the nut is in the above state.