JP2821930B2 - Side cutting method using progressive type - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Summary] Side cutting method using progressive die, more specifically, when side cutting is performed on flat plate material after drawing, trimming, etc. using progressive die Next, regarding the method for securing the intersection of the side cuts, the side cut performed after performing the drawing shaping performed on the flat material using the progressive die and the outer trim process is strict, for example, about 0.03 mm. Aiming to provide a method that can be performed within the tolerance range, when performing progressive shaping, outer trim, and side cut using a progressive type material, the outer trim is used by utilizing the gap formed in the material by the outer trim. The method includes a side cutting method using a progressive type, characterized in that a side cutting is performed below the joint portion left in step (1).

[Industrial applications]

The present invention is a method of side cutting using a progressive die, more specifically, in the case of performing a side cut following a step of drawing and shaping, trimming an outer shape of a flat material using a progressive die, the tolerance of the side cut is set. How to secure.

[Conventional technology]

A cup-shaped product is obtained by performing processes such as drawing, outer trim, and side cutting on a flat material (an example is shown as a product 14 in FIG. 2 showing an embodiment of the present invention).
When forming, there is a problem with the side cut.

Referring to FIG. 4 showing a conventional example, as shown in FIG. 4A, a gap (cut) 12 is formed in a raw material 11 by external trimming, and a connecting portion 13 is left at that time. next,
Referring to FIG. 2B, the side cut is performed and the product 14 is cut.
Is cut off from the material 11 and a side cut portion having a width W and a height H is formed on the product 14. The product 14 is used, for example, for the purpose of housing a small motor inside.

Conventionally, the tolerance range of the width W and the height H was so-called a rough one of 0.2 mm, so that the side cut was performed in the tolerance in this range as shown in the plan view of the process layout in FIG. In the first step, the dimensional tolerance was able to be secured by cutting the portion indicated by A in the drawing in consideration of the size of the side cut.

[Problems to be solved by the invention]

However, when the tolerance range of the width W of the side cut becomes stricter at 0.03 mm and the tolerance range of the height H becomes stricter at 0.1 mm, the process shown in FIG. It is difficult to secure the tolerance dimensions.

Therefore, as shown in the plan view of FIG.
A method has been attempted in which a portion indicated by is rough cut in advance, a relief is provided at a place where it becomes an obstacle in the side cut, and a side cut is performed in a later step. In this example, the tolerance dimension of W can be secured when the portion A is rough cut, but this method cannot be practically used when the dimension tolerance of W is required in the depth direction, that is, in the entire dimension range of the height H.

Further, as shown in the side view of FIG. 6, a method of performing a tapered side cut instead of a straight side cut has been attempted. In FIG. 6, reference numeral 21 denotes a side cut punch. However, in this method, the sheared surface is tapered and the tip is sharpened. When used as a product, for example, in a case where an electric wire (cord) is inserted into a side cut portion, a problem that the cord is cut occurs. The cutting method is not suitable for practical use.

Further, as shown in FIG. 7, after the shaping of the drawing shape, the flange portion obstructing the side cut is formed by the lower mold.
A method was attempted in which the scrap was pulled upward as indicated by a white arrow using No. 22, the scrap was sucked and discharged by vacuum, and then a side cut was made. However, in this method, it is difficult to reliably discharge the scrap, and it is not practical.

Therefore, the present invention provides a method capable of performing a side shaping performed after performing a drawing shaping and an outer trimming process performed on a flat material using a progressive type within a tight tolerance range of about 0.03 mm, for example. The purpose is to do.

[Means for solving the problem]

The problem described above is that when performing progressive shaping, outer trim, and side cut using a progressive type on the material, the gap formed in the material by the outer trim is used, and a side cut is made below a joint portion left by the outer trim. The problem is solved by a side cutting method using a progressive type, which is characterized by performing the following.

[Action]

That is, the present invention utilizes the gap formed by the outer trim, performs side cuts by three-sided cuts, and also performs product separation, and is made by the outer trim performed with a secured tolerance. The required tolerance dimension can be ensured by utilizing the gap.

〔Example〕

Hereinafter, the present invention will be specifically described with reference to the illustrated embodiments.

An embodiment of the present invention is shown in FIGS. 1 to 3, in which 11 is a flat material, 12 is a cut (gap), 13 is a joint,
14 is a product.

According to the method of the present invention, the material 11 is subjected to a drawing forming process and an outer trim process using a progressive die, and a gap 12 is formed in the material 11 (see the sectional view taken along the line II-II in FIGS. 1 and 1). Left view of each second). 5mm width indicated by w in the diagram of the joint 13
Set to.

The part to be the product formed in the above process is shown in FIG. 3, which is a view as seen in the direction of arrow III in FIG.
2 is shown with diagonal lines. The gap 12 is formed to have an interval of about 1 mm in this embodiment. Utilizing this gap 12, using a side cut punch constituting a part of the progressive die to cut three surfaces, that is, cut surfaces 15a, 15b, and 15c below the connecting portion 13, the width W and the height H are reduced. A side cut is obtained.
A side-cut punch having a known blade formed sideways was used, and the punch was lowered from above, and a side-cut was performed by moving the punch blade in the lateral direction using a cam (FIG. 1). And FIG. 2 respectively on the right). In this embodiment, W is
8 mm (tolerance 0.03 mm) and H was 4 mm (tolerance 0.1 mm).
That is, by using the gap 12 shown in FIG. 3, the side cut was performed without hindrance, the portion with sand was removed in FIG. 3, and the tolerance dimension within a predetermined range was obtained. is there. The side cut also serves as product separation as shown on the right side of FIG.

〔The invention's effect〕

As described above, according to the present invention, it is possible to easily perform a side cut with a strict tolerance by a progressive feeding type.

[Brief description of the drawings]

1 is a plan view of an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1, FIG. 3 is a view taken in the direction of arrow III in FIG. 2, and FIG. (A) is a plan view, (b) is a view in the direction of arrow B in FIG. (A), (c)
5 is a plan view of a process layout, FIG. 5 is a diagram of a conventional example, (a) is a side view, (b) is a plan view of a process layout, and FIGS. 6 and 7 are side views of a conventional example. . In the figure, 11 is a material, 12 is a cut (gap), 13 is a joint, 14 is a product, 15a, 15b, 15c is a cut surface, 21 is a side cut punch, and 22 is a lower die.

Claims (1)

(57) [Claims] An outer trim is formed by using a gap (12) formed in the material (11) by the outer trim when performing aperture shaping, outer trim, and side cut using a progressive die on the material (11). A side cutting method using a progressive die, characterized in that a side cut is made below a joint portion (13) left in step (1).