JP3175025B2 - Press mold - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press die suitable for forming a saw blade-shaped cutter which is mainly used for extracting a synthetic resin wrap film from its winding case and cutting it to a predetermined length.

[0002]

2. Description of the Related Art Conventionally, it is difficult to cut a hardened steel material which has been hardened in advance with a normal machine tool when manufacturing a mold for forming a cutter for the above-mentioned use. Although this is possible, there is a problem in the dimensional accuracy, and it is generally processed by a wire cutting method.

In this case, when cutting out a pointed portion such as a vertex of a triangle, for example, the vertex portion (mountain) of the male mold a is cut out.
b can be machined at an acute angle, that is, without R, but R remains in the valley d of the female mold c corresponding to the vertex b as shown in FIG. , And cannot be less than the R of the wire.
Is a minimum of 0.15 mm).

Therefore, R remains at the bottom of the valley d of the female mold c,
If the peak portion b, that is, the tip of the peak of the male die a is sharpened, the tip of the peak a contacts the bottom of the valley b as shown in FIG.

[0005] After the primary wire cutting, the polishing operation,
A method of sharpening both peaks and valleys has been used. However, in implementing this method, it is necessary to magnify with a microscope and visually observe
A skilled worker requires time-consuming processing, which is too costly and time-consuming, and there is no margin at the tip, so that a problem remains in durability.

[0006]

SUMMARY OF THE INVENTION The present invention improves the disadvantages of the prior art described above, and can be constructed at relatively low cost without interference between the male peaks and the female valleys. It is intended to provide a press die.

[0007]

That is, the present invention relates to a press die for forming a die by combining a male die and a female die. In the present invention, the peak of the male die is sharpened and opposed to this. It is another object of the present invention to provide a press die characterized in that a dug portion is formed in a valley portion of a female die in order to avoid contact with the apex.

[0008]

In the press mold comprising the male mold and the female mold obtained as described above, even if the tip of the male mold is sharpened,
The female mold having a corresponding valley can be subjected to a punching operation without interference by forming the dug-down portion.

[0009]

FIG. 1 shows an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a male type, 2 denotes a female type, and the peak 4 of the peak 3 of the male type 1 is sharpened, and the female type 2 opposed thereto is sharpened.
The valley 5 is formed with a dug portion 6 to avoid contact with the vertex 4.

An example of the numerical value of each part in practical use is shown in FIG.
0 °, the distance between the tip of the peak 3 and the bottom of the valley 5 is 0.14 mm, and the gap between the male mold 1 and the female mold 2 is 0.07 mm.
mm.

In the drawings, the male mold 1 and the female mold 2 are shown as having saw-toothed blades. However, regarding the application of the present invention, sharp peaks and valleys other than the sawtooth are defined. It shall cover all the press dies that have.

[0012]

According to the present invention, the peak of the male peak can be sharply formed without causing interference between the male peak and the female valley. A press die capable of processing a saw blade-shaped cutter for cutting a synthetic resin wrap film drawn out of the same with extremely high performance can be obtained.

[Brief description of the drawings]

FIG. 1 is an enlarged plan view showing a main part of a press die according to the present invention.

FIG. 2 is an enlarged plan view showing an example of a conventional example.

FIG. 3 shows interference between a male peak and a female valley in a conventional example.

[Explanation of symbols]

 1 Male type 2 Female type 3 Mountain 4 Apex 5 Valley 6 Drilling part

──────────────────────────────────────────────────の Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B21D 28/14 B21D 28/34 B21D 53/60-53/72 B26F 1/44

Claims (2)

(57) [Claims] 1. A method for forming a press die for punching out a combination of a male die and a female die, wherein a peak of a male die is sharpened, and a female valley portion opposed to the male die is provided with a valley. A press die characterized by forming a dug-down portion to avoid contact with the apex. 2. The press die according to claim 1, wherein the dug portion is processed by a wire cutting method.