JPH02235531A - Switching device of piercing punch - Google Patents

Abstract

PURPOSE:To enable selection between the use when the work of piercing hole is required and the used when it is not required by attaching a button die on one side of a pair of die, attaching a piercing punch on the other side and switching selectively their position by moving the piercing punch in the axial direction. CONSTITUTION:When an upper die 4 is lowered in the state that a flange part 23 is seated on the step part 32 of a punch retainer 22, the piercing hole H is formed by engaging the tip of the piercing punch 21 with the button die 20 of the other side at the position of bottom dead center. When a sleeve 27 is rotated in the direction of the arrow (m1) by operating a pneumatic motor 28, the whole of the piercing punch 21 is lifted by a stroke C until the flange part 23 is seated on the lower end face of the sleeve 27 by the screwing action of a female screw part 31 and a screw shaft part 24. Even if the upper die 4 is lowered in that state, the piercing punch 21 isn't engaged with the button die 20 at the position of bottom dead center of the upper die 4. Thus the surrounding space of the punch can be saved by arranging the screw member, etc., with which the position of the punch is switched according to the necessity or not of piercing work, on the same axial line.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a press die for the purpose of making pierced holes.
This device relates to a switching device for a piercing punch which can be used for cases where piercing holes are required or not by moving the piercing punch forward or backward to switch its position.

2. Description of the Related Art As a press mold equipped with this type of switching device, for example, there is a press mold having a structure shown in FIG. The figure shows a composite press mold structure that performs trimming and piercing holes at the same time. The upper mold 4 is constituted by the upper holder 2 and the pad 3, which are elastically supported pads that can move up and down through the body.

A plurality of button dies 5 and 6 are attached to the die 1, and on the other hand, a sexual die 7 for trimming and a plurality of piercing bonches 8 and 9 that engage with the button dies 5 and 6 are attached to the upper holder 2. ing. While the piercing punch 8 is integrally fixed to the upper holder 2 by a punch retainer 10, the piercing punch 9 is attached to the upper holder 2 by a select retainer 11 so as to be movable up and down.

As shown in FIGS. 6 and 7, the select retainer 11 includes a retainer block 12 that supports the piercing punch 9 in a vertically movable manner, a back plate 13 provided on the upper surface of the retainer block 12, and a retainer block l2. Select par 1 inserted between Babuku plate 13
4, and an air cylinder 15 that moves the selector 14 forward and backward. Since both the flange portion 16 of the piercing punch 9 and the tip of the selector 14 are formed in a tapered shape, the selector is located between the flange portion l6 and the bank plate I3 as shown in FIG. Pierce punch 9 by inserting 14
is held at the normal position, and by retracting the selector 14, the piercing punch 9 can be moved up by the thickness of the selector 14. ] 7 is a plate that controls the rotation of the piercing punch 9.

In more detail, if it is assumed that the selector 14 is inserted between the piercing punch 9 and the back plate 13 as shown in FIG. The peripheral edge of the workpiece W is trimmed as scrap S by the shearing action between the sectional die 7 and the cutting edge 1a on the die 1 side. At the same time, the piercing punches 8 and 9 and the button dies 5 and 6 are engaged with each other, and the piercing hole H is punched and formed by the shearing action of the two.

On the other hand, even if the workpieces have the same shape, depending on the specifications or types of the workpieces, there are cases where the piercing hole H corresponding to the piercing punch 9 in FIG. 6 is not necessary, for example. In such a case, processing is performed after retracting the selector 14 as shown by the imaginary line in FIG. As a result, even if the piercing punch 9 comes into contact with the workpiece W due to the lowering of the upper die 4, the piercing punch 9 will be relatively raised by the thickness of the selector 14, and will not engage with the button die 6. First, the piercing hole is not punched using the piercing punch 9.

In this way, by inserting and removing the selector 14, it can be used depending on whether the piercing hole H needs to be processed or not.

Problems to be Solved by the Invention However, according to the above conventional structure, the selector retainer 11 is large because the selector 14 is slid horizontally relative to the retainer block 12 that supports the vertical piercing punch 9. This means that a large installation space is required. In particular, when multiple pierced holes H to be processed are close to each other, the increase in size of the select retainer It may cause interference between the select retainers or between the select retainer 11 and the punch retainer IO, and as a result, A situation arises in which a plurality of pierced holes that are close to each other must be processed in several steps.

The present invention was made in view of the above problems.
The purpose is to provide a structure in which the switching drive system of the piercing punch is made more compact.

Means for Solving the Problems The present invention, as described above, attaches a button die to one of the pair of dies that move closer to each other, and attaches a piercing punch that engages with the button die to the other. The piercing punch is attached to a piercing punch switching device that moves the piercing punch back and forth in the axial direction to selectively switch its position in order to respond to cases where piercing hole processing is necessary or unnecessary. A rotary actuator provided on the other mold is interposed between the output shaft of the actuator and the piercing punch, and is displaced in the axial direction according to the rotational output of the actuator to allow axial displacement of the piercing punch. The actuator and the screw member are arranged on the same axis as the piercing punch.

According to this structure, the screw member is displaced in accordance with the rotational output of the actuator, so that the piercing punch can be moved up and down, and its position can be changed.

Further, all the elements such as the actuator and the screw member are arranged on the same axis as the piercing punch, so that space can be saved.

Embodiment FIGS. 1 and 2 are diagrams showing a more specific embodiment of the present invention, and parts common to FIG. 5 are designated by the same reference numerals.

As shown in FIG. 2, the upper holder 2 has button dies 5 and 2.
A plurality of piercing punches 8 and 21 corresponding to the piercing punches 8 and 21 are arranged, and among these, a pair of piercing punches 8 is integrally fixed to the upper holder 2 via a punch retainer 10, while the remaining piercing punches 21 is punch retainer 22
It is supported so that it can move up and down.

As shown in FIGS. 1 and 3, the piercing bolt 21 has a large-diameter flange portion 23 and a threaded shaft portion (male thread portion) 24 integrally formed. A flat portion 25 is formed by cutting. By aligning this flat portion 25 with the flat portion 26 on the punch retainer 22 side, the piercing punch 2l is prevented from rotating relative to the punch retainer 22.

On the other hand, a sleeve 27 as a screw member located on the same axis as the piercing punch 21 is rotatably inserted into the upper holder 2, and a pneumatic motor 28, which is a rotary actuator, is attached above the sleeve 27. and,
The sleeve 27 connects the key 3 to the output shaft 29 of the pneumatic motor 28.
0, and a female threaded portion 31 is formed on the inner circumference of the sleeve 27.
is screwed onto the threaded shaft portion 24 of the piercing punch 21. That is, each element of the screw shaft portion 24, the sleeve 27, and the pneumatic motor 28 is arranged on the same axis as the piercing punch 2l.

According to the structure of this embodiment, when the upper mold 4 is lowered with the flange portion 23 seated on the stepped portion 32 of the punch retainer 22 as shown in FIG. At the bottom dead center position of the mold 4, the tip of the piercing punch 2l engages with the mating button die 2 (1), and the shearing action forms the piercing hole H.

On the other hand, when the pneumatic motor 28 is operated to rotate the sleeve 27 in the direction of the arrow m1 from the state shown in FIG. The entire piercing punch 21 is raised by a stroke C until it is seated. Even if the upper mold 4 is lowered in this state, the piercing hole H will not be formed because the piercing punch 21 does not engage with the button die 20 at the bottom dead center position of the upper mold 4. That is, by moving the piercing punch 21 up and down, it can be used for cases in which the piercing hole H needs to be processed and cases in which it is not necessary, as in the conventional case.

Furthermore, in the above structure, when the piercing punch 21 is viewed in plan, there is no member protruding outside the punch retainer 22, so that the plurality of piercing holes required as shown in FIG. Even if the piercing holes 8 and 20 are close to each other, the piercing punches 8 and 20 for processing them can be arranged close to each other without any difficulty.

Note that the screw shaft portion 24 in FIG.
It does not have to be integrated with the piercing pin 21, but may be constructed separately from the piercing punch 21 as long as it is non-rotatable and only movable vertically.

FIG. 4 is a diagram showing another embodiment of the present invention. In this embodiment, the output shaft 40 of the pneumatic motor 28 and the piercing bolt 41
The screw shaft 42, which is a screw member separate from the It is screwed into the female threaded portion 46 on the holder 2 side. 47
is a rotation prevention plate similar to that shown in FIG.

According to this structure, by lowering the upper mold 4 with the screw shaft 42 at the lower limit position as shown in FIG. 4, the piercing punch 41 engages with the button die 20 and the piercing hole H
processing is performed. Further, when the screw shaft 42 is rotated and raised by the stroke C1, a gap corresponding to the stroke CI is secured between the screw shaft 42 and the piercing punch 41. Therefore, even if the upper die 4 is lowered, the entire piercing punch 41 is pushed up by the stroke Cl when the piercing punch 41 contacts the workpiece W, so the piercing punch 41 does not engage with the button die 20.
The pierced hole H is not processed.

Effects of the Invention As described above, according to the present invention, the actuator and the screw member for switching the position of the piercing punch depending on the necessity of drilling the piercing hole are arranged on the same axis as the piercing punch. In addition to saving the surrounding space, even if multiple piercing holes are drilled in close proximity to each other, the piercing punches for drilling the holes can be placed close together without any difficulty. Earring holes can now be processed in one step, which previously was not possible, contributing to a reduction in the number of steps.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a first embodiment of the present invention, and is an enlarged view of the main part of FIG. 2, and FIG. 3 is a sectional view taken along line 1 and 2 in FIG. 1, FIG. 4 is an enlarged view of the main part showing the second embodiment of the present invention, and FIG. 5 is a sectional view of a press die equipped with a conventional switching device. 6 is an enlarged view of the main part of FIG. 5, and FIG. 7 is a sectional view taken along line a-a in FIG. 6. l...Gui as a lower mold, 4...upper mold, 5,20.
... Button die, 8.21 ... Earring punch, 10.
22... Punch retainer, 24... Screw shaft portion, 27
...Sleeve as a threaded member, 28...Pneumatic motor as an actuator, 3l...Female thread part, 4
DESCRIPTION OF SYMBOLS 1... Pierce punch, 42... Screw shaft as a screw member, 46... Female thread part, W... Work. Figure Figure Figure Figure Figure

Claims (1)

[Claims] (1) Attach a button die to one of a pair of molds that move closer to each other, and attach an earring punch that engages with the button die to the other, and when it is necessary to make piercing holes with this piercing punch and when it is not necessary. In order to cope with this, the piercing punch switching device moves the piercing punch back and forth in the axial direction to selectively switch its position, which includes: a rotary actuator provided on the other mold to which the piercing punch is attached; , a screw member that is interposed between the output shaft of the actuator and the piercing punch and displaces in the axial direction according to the rotational output of the actuator to allow the axial displacement of the piercing punch, the actuator and the screw member A switching device for a piercing punch, characterized in that the and the piercing punch are arranged on the same axis.