JPS61242726A - Forming method for minute slit - Google Patents

Abstract

PURPOSE:To draw out of a plate material by crossing both ends of both shearing parts each other and to form a minute slit by forming the opposing shearing part of notch shape by a punch on the plate material in the shearing stage of two steps. CONSTITUTION:The first shearing part 4 of a plate material 3 parenthesizing shape is formed by descending a punch 2. In this case the first shearing part 4 is composed of the crossing parts 18, 18 formed with extension at the prescribed angle from both ends of the linear slit forming part 17 and slit forming part. The area 16 surrounded by the first shearing part 4 is bent to the lower part. The punch 2 is then ascended and the plate material 3 is moved for the shearing part 4 so that the punch 5 can be located at the position leaving the size corresponding to the slit width S. In this case the area 6 is flattened with pressing. The punch 5 is then descended and the second shearing part 6 is formed on the plate material 3. This shape is parenthesizing and symmetrical with the shearing part 4 and the punched part F surrounded by the shearing parts 4, 6 is released.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of forming minute slits for forming slits of minute width in a plate material.

(Prior art) Generally, when forming a long slit hole in a plate material, it is punched out using a press process, but the minimum punching width is limited by the physical strength of the punch, etc.
This limit is usually about the thickness of the material. Further, the absolute punching width is also limited to approximately 0.12+u+, and it is impossible to form a minute slit smaller than this with a simple punch.

Conventionally, such minute slits were formed by making a notch in the plate material and bending at least one edge facing the notch by 2 to form a slit with a minute width, or by applying an ultra-thin grindstone to the plate material. The method used was to form slits by grinding or laser processing.

(Problems to be Solved by the Invention) However, the above-mentioned two-bending method cannot maintain flatness, which limits its uses, requires time to form, and has the problem of making it difficult to obtain highly accurate slits. .

In addition, the latter method using grinding or laser processing requires more time for molding and has the problem of increasing costs.

The present invention provides a method for forming minute slits that eliminates these conventional problems.

(Means for Solving the Problems) The present invention particularly relates to a method for forming minute slits in a plate material, and its feature is as shown in FIG. A first shearing step of shearing a part to form the first sheared part 4, and FIG. 2(B)
As shown in the figure, a dimension corresponding to the slit width S is set for the first shearing section 4, and a part of the plate material 3 is sheared with a punch 5 so that both ends intersect with the first shearing section 4, and a second shearing is performed. It consists of a second shearing step to form part 6.

(effect) Next, the operation of the present invention will be explained.

As shown in FIG. 1(B), a cut-shaped first sheared portion 4 is formed by the first shearing step. Next, Figure 2 (
As shown in B), the second shearing process creates a cut-shaped second
A shearing section 6 is formed. At this time, since both ends of the shearing section 6 intersect with the shearing section 4, the extraction portion F surrounded by both front sections 4 and 6 is completely extracted from the plate material 3 by a two-step shearing process.

(Example) Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

1 and 2 show the process of forming minute slits by the method of the present invention, in which (A) is a cross-sectional side view of the plate material and the forming device, (B) is a plan view of the plate material, and FIG. FIG. 2 is a plan view of the molding device.

First, the schematic structure of the molding apparatus M will be described with reference to FIGS. 1 and 2.

In the figure, reference numeral 10 indicates a die, and above this die 10, a punch 2.5 is arranged. The upper surface of the die 10 is a flat surface, and the plate material 3 set on this upper surface can be moved by predetermined dimensions. The die 10 has a receiving hole 11 for inserting the punch 2.5.
are formed in the vertical direction.

On the other hand, a pair of punches 2.5 are arranged at a predetermined interval in the front and rear, and the cross-sectional shape thereof is formed into a trapezoid as shown in FIG. The blade part of the punch 2.5 is a straight slit forming blade part 1.
4, and a cut forming blade part 15 formed at a predetermined angle from both ends of the slit forming blade part 14 toward the slit forming side.
15, and both punches 2.5 are arranged symmetrically. In addition, since the punch 2.5 is disposed so as to be substantially in contact with the front and rear walls of the receiving hole 11, the planar shape of the receiving hole 11 has approximately the same shape as the punch 2.5 at the front and rear sides, and the entire receiving hole 11 has the same shape as the punch 2.5. Make into a square shape.

Next, a method of forming a minute slit, which is a method of the present invention, will be explained with reference to FIGS. 1 and 2.

First, number 11! The punch 2 is lowered as shown in I(A), and a part of the plate material 3 is sheared by the punch 2. In this case, it is desirable that the downward stroke of the punch 2 be such that it is slightly inserted into the receiving hole 11.

As a result, the first shearing portion 4 in the shape of a parenthesis as shown in FIG. 1(B) can be formed on the plate material 3. The first shearing section 4 includes, for example, a linear slit forming section 17 and an intersection section 18.1 extending from both ends of the slit forming blade 17 at a predetermined angle.
Consists of 8. Note that, as shown in FIG. 1(A), the area 16 surrounded by the first shearing portion 4 is bent downward.

Next, the punch 2 is raised and the plate material 3 is moved by a predetermined distance (in the direction of arrow H) as shown in FIG. 2(A).
let By this movement, the movement length is controlled so that the punch 5 is located at a position corresponding to the slit width S with respect to the shearing part 4.

This completes the first shearing step. Note that it is desirable to press the plate material 3 in this state to flatten the area 16. Such processing may be performed simultaneously when the punch 5 is lowered, for example.

Then, as shown in FIG. 2A, the punch 5 is lowered, and a part of the plate material 3 is sheared by the punch 5. As a result, a second shearing section 6 as shown in FIG. 2(B) is formed. This shape is parenthetical and approximately symmetrical with respect to the shearing section 4. Therefore, the extraction part F surrounded by the first shearing part 4 and the second shearing part 6 is completely separated from the plate material 3,
It falls downward as shown in Figure 2 (A). As a result, a minute slit 1 as shown in the same figure (B) can be formed,
This shape becomes an elongated substantially hexagonal shape.

Since minute slits are formed by such a method, any narrow slit can be formed in principle, and the slit width S is 0.01 m+ to 0.15 I1 m.
It is possible to mold even small objects.

Note that during the second shearing process, a part of the plate material 3 is bent downward by the punch 5 as shown in FIG. 2(A), so it is desirable to flatten it by pressing. Note that such a press is not necessary if the plate material 3 has elasticity and the bending is within the elastic limit.

Although the embodiments have been specifically described above, the present invention is not limited to these embodiments. For example, the shape of the minute slit 1 and the shape of the first and second shearing parts 4 and 6 are
It can be applied to any shape as shown in the plan views of the plate material 3 shown in FIGS. In addition, in FIGS. 4 to 6, the same parts as in FIGS. 1 and 2 are given the same reference numerals to clarify the structure.

Further, the forming device M is not limited to the example shown, and any configuration can be applied. For example, the punches 2 and 5 may be integrally formed, or the receiving hole 11 may be separately separated from each punch 2.5. It may also be provided. Furthermore, the plate material 3 is fixed and the punch 2
．． 5 may be moved. Other shapes, configurations, arrangements, means, etc. of the phase portions may be modified as desired without departing from the spirit of the present invention.

Although the method for molding microslits according to the present invention can be used in all technical fields, it is particularly suitable for molding lead frames for semiconductor devices, which are electronic components, and is suitable for miniaturization,
It can also fully meet the demand for higher circuit density.

(Effects of the Invention) As described above, according to the method for forming a minute slit according to the present invention, a minute slit is formed in a part of the plate material by a two-step shearing process in which the first sheared portion and the second sheared portion are formed using a punch. Therefore, the following effects will be obtained.

■By using a punch, it is possible to form slits with minute widths that were previously considered impossible. For example, slits that were previously limited to a width of 0.12 mm can now be made as wide as 0.01 mm. .

■Dimension accuracy of micro slits can be greatly improved, and molding time can also be shortened, improving quality and reducing manufacturing costs.

[Brief Description of the Drawings] Figs. 1 and 2 show the process of forming microslits by the method of the present invention, in which (A) is a cross-sectional side view of the plate material and the forming device, and (B) in the figure is a cross-sectional side view of the plate material. FIG. 3 is a plan view of a forming apparatus, and FIGS. 4 to 6 are plan views of plate materials showing other embodiments. In the drawings, 1... minute slit, 2.5... punch, 3... plate material, 4... first sheared part, 6... second sheared part, F... extracted part, S.
...Slit width. Figure 2 (A)

Claims (1)

[Claims] 1. In a method for forming minute slits in a plate material,
A method for forming microslits comprising at least the following steps. (b) A first shearing step of shearing a part of the plate material with a punch to form a first sheared part; (b) A dimension corresponding to the slit width is set relative to the first sheared part, and both ends are the first sheared part. a second shearing step of shearing a part of the plate material with a punch to form a second shearing section so as to intersect with the slit forming section; 2. The method for forming a micro slit according to claim 1, wherein the micro slit is formed by intersecting portions extending at a predetermined angle from both ends of the portion.