JPH08300062A - Punching tool and die - Google Patents

Abstract

PURPOSE: To improve the press operation efficiency and to reduce the running cost of a die by changing the shape of a segmental die, eliminating chipping of a die cutting blade generated by the slippage of the die piece, and reducing the frequency of maintenance. CONSTITUTION: On die pieces 3a, 3b, 3c, an engage part 5 to engage them mutually is installed. The engage part 5 is composed of a projecting part 6 and a recessed part 7 formed on the segmentation face. When these die pieces are inserted in the die plate in the state of engaging these die pieces 3a, 3b, 3c with the engage part 5, the die pieces are not released, so these die pieces can be restored and assembled without chipping.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a punching die and a die in which a split die is inserted into a die plate.

[0002]

2. Description of the Related Art Conventionally, a progressive die has been used for punching an IC lead frame or the like. In this die, as shown in FIG. 2, the die 1 is inserted into the die plate 2. When the die 1 is required to have a complicated and fine punched shape, a divided die composed of a plurality of die pieces 3 is used. FIG. 3 shows the details of such a dividing die 1. The dividing die 1 is composed of a die piece 3 divided into three by a flat dividing surface, and a very fine die cutting is performed on a dividing line. The blade portion 4 is formed.

When such a split die 1 is inserted into the die plate 2, the die pieces 3 are inserted in a state where they are assembled in advance. However, even if they are assembled, they are plane divisions and are easily displaced from each other. It may slip and a part of the die piece 3 may be tilted as shown in FIG. When the die piece 3 is tilted, the cutting edge portions 4 and 4 of the adjacent die pieces 3 come into contact with each other to cause chipping (fine chipping), resulting in an increase in the number of maintenances and an increase in cost during press mass production. It was a cause of delay in delivery.

[0004]

As described above, in the conventional punching die using the plane-divided die,
When inserting the die into the die plate, the die piece was tilted and chipping occurred frequently.

When chipping occurs, not only is cost increase during mass production of the press and delay of delivery time, it is necessary to individually grind the cutting edge surface of the die piece where chipping has occurred to remove the chipping.

This work was very uneconomical because it shortened the life of the die piece itself and forced it to be manufactured again without waiting for the completion of a predetermined mass production number.

Further, since the number of times of maintenance increases, the number of times that press mass production is temporarily stopped increases, which causes a problem that the operating efficiency of the press machine decreases.

An object of the present invention is to solve the above-mentioned drawbacks of the prior art by changing the shape of the split die,
To provide a punching die and a die that can eliminate the occurrence of chipping of the die cutting edge when inserting into the die plate, reduce the number of maintenance, improve the press operating efficiency, and reduce the running cost of the die. is there.

[0009]

The punching die of the present invention comprises:
In a punching die in which a die is divided into a plurality of die pieces, which are inserted into a die plate and reassembled, an engaging portion for engaging these die pieces with each other is provided.

Further, the die of the present invention is a die composed of a plurality of die pieces, and each die piece is provided with an engaging portion for engaging them with each other. This engaging portion is preferably provided on both sides of the die piece.

[0011]

[Operation] If the die piece is provided with an engaging part for engagement, if the die piece is inserted into the die plate while it is engaged, the die piece will not be disengaged due to the lateral pressure received at the time of insertion, so the die piece will not tilt during insertion and the cutting edge No chipping occurs on the part.

[0012]

EXAMPLE An example in which the example of the present invention is applied to a precision progressive punching die will be described below. Precision progressive punching die,
A work material is placed on a die inserted into a die plate, the work material is held down by a stripper, and a punch is lowered to punch the work material into a die shape provided in the die.

This die is divided into a plurality of (three in the figure) die pieces 3 (3a, 3a) as shown in FIG.
b, 3c), and by combining the dividing surfaces,
A fine die cutting edge portion 4 is formed on the dividing line. Engagement portions 5 are provided on the divided surfaces of the die piece 3 so as to engage them with each other, and when these are engaged with each other and inserted into the die plate, the die piece 3 is prevented from shifting and tilting. In the illustrated example, the die pieces 3a and 3b located on the front side and the back side are provided with the convex portions 6 commonly called "geta", and the intermediate die piece 3c sandwiched between them is provided with the concave portions 7 that engage with the convex portions 6. is there. The concavo-convex portions 6 and 7 are provided on both sides of the die piece 3 in order to surely prevent the deviation.

If the divided dies 1 constructed as described above are inserted into the die plate in a state of being engaged with each other, it is possible to withstand the lateral pressure at the time of insertion. Can be attached. As a result, chipping of the die cutting edge portion 4 due to the inclination can be effectively prevented. Further, by providing the engaging portion, the wobble of the work can be prevented during the die piece production, especially during the surface grinding process, and the production becomes easy.

In the above embodiment, the case where the engaging portions are provided on both sides of the die piece has been described, but it may be provided on only one side. In addition, each die piece has a convex or concave portion on the side.
Although the case where each of them is provided is shown, a plurality of steps may be provided in a stepped manner.

[0016]

According to the present invention, since the engaging portion for engaging the die piece is provided, if the die piece is inserted into the die plate in the engaged state, the die piece will not tilt, and chipping due to tilting is effective. Can be prevented. Therefore, the number of maintenance operations can be reduced, the press operating efficiency can be improved, and the die running cost can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view of a split die showing an embodiment of the present invention.

FIG. 2 is a perspective view showing a relationship diagram between a die and a die plate of a die-insert type precision progressive die.

FIG. 3 is a perspective view of a conventional split die.

FIG. 4 is a perspective view of a split die for explaining a state where a part of the die piece is tilted.

[Explanation of symbols]

 1 split die 2 die plate 3 die piece 4 die cutting edge portion 5 engagement portion 6 convex portion 7 concave portion

Claims (3)

[Claims] 1. A punching die in which a die is divided into a plurality of die pieces, which are then inserted into a die plate for reassembly and assembly, and an engaging portion for engaging the plurality of die pieces with each other. A punching die characterized by being provided with. 2. A die comprising a plurality of die pieces, wherein the plurality of die pieces are provided with engaging portions for engaging them with each other. 3. The die according to claim 2, wherein the engaging portions are provided on both sides of the die piece.