JPH06277781A - Manufacture of base material for chain plate - Google Patents

Abstract

PURPOSE:To improve the yield of material and to enhance the fatigue strength by forming a bar into a projected and recessed shape, forming into a strip, cutting and separating for the base material for a chain plate. CONSTITUTION:A bar 1 is rolled by a forming roll, forming it into a continuous gourd-shape in the longitudinal cross-section, and recessed parts 2 and recessed grooves 3 for separating and cutting off the continuous gourd-shape as individual gourd shapes are simultaneously formed. This bar 1 is rolled and formed into a strip material 4 whose edge in the longitudinal direction is contoured in a continuous gourd-shape. The strip 4 is cut off at the recessed grooves 3 in conformity with each gourd-shaped contour of the edge, and a gourd-shaped base material for a chain plate 5 is separated. Since the fiber direction of the base material is not parted and is flowed in the longitudinal direction along the shape, the fatigue strength of the material is enhanced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a chain plate material having a desired shape and a high yield of the material and without lowering mechanical strength.

[0002]

2. Description of the Related Art Conventionally, for example, when manufacturing a gourd-shaped chain plate, for example, Japanese Patent Publication No. 63-15048.
As disclosed in Japanese Unexamined Patent Publication (Kokai) No. Hei 11 (1999) -53242, punching is performed from a strip-shaped steel sheet so as to complement each other's gourd-shaped contours to improve the material yield.

[0003]

In the above-mentioned prior art, although the material can be punched out in the central portion of the strip-shaped steel sheet with a good yield, the side edge of the strip-shaped steel sheet is linear, so When punching a gourd-shaped chain plate closer to, it is impossible to complement the gourd-shaped curve and the side straight line, so the material yield is significantly reduced, and the metal fiber flow is cut to punch it out. It had reduced mechanical strength.

[0004]

SUMMARY OF THE INVENTION Therefore, according to the present invention, the side edges of a chain plate material are formed by plastic working into both side edge irregularities formed by connecting chain plates of a desired shape in the longitudinal direction. A method for manufacturing a chain plate material that solves the above-mentioned problems of the prior art, in which a chain plate of a desired shape is connected in the length direction by plastic working of the longitudinal sectional shape of a bar material such as steel bar or wire rod. Is formed into a concavo-convex shape on both sides, and then
The bar material is rolled to form a strip-shaped plate material whose side edges in the longitudinal direction have the irregular shape, and then the strip-shaped plate material is conformed to the irregular shape of the side edges to perform a cutting process to form a chain plate having a desired shape. It is a method of separating into raw materials.

[0005]

According to the method of the present invention, when the bar material is formed into a continuous shape having a concavo-convex contour of the side edge of the chain plate having a desired shape in the longitudinal direction, the bar surface is rolled into a rolled surface. The uneven continuous shape of the plate disappears after flattening, but the uneven continuous shape of the rolling side remains and forms the side edge of the strip plate material. The chain plate material can be cut and separated.

Then, the chain plate material is made into a chain plate product by penetrating the connecting pin insertion holes and finishing the outer contour.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory view of a method for manufacturing a gourd-shaped chain plate material which is an example in which the side edge shape of the chain plate according to the present invention is symmetrical. First, in the first step, A rod 1 such as a round bar or a wire rod is rolled by a die roll to form a continuous cross-section in the shape of a gourd, and the recess 2 and the gourd of the continuous shape are separated and cut into individual gourds. The concave groove 3 for forming is formed at the same time.

In the second step, the bar material 1 which has been subjected to the first step is rolled to form a strip-shaped plate material 4 whose side edges in the longitudinal direction have a continuous shape of the gourd-shaped contour.

The third step is a method of separating the concave groove 3 into a gourd-shaped chain plate material 5 by cutting the groove 3 in conformity with the gourd-shaped contour shape of the side edge of the strip-shaped plate material 4.

In the case of a symmetrical flat plate in which the side edges of the chain plate in the lengthwise direction have no irregularities, only the annular groove 3 for separating and cutting described above should be plastically worked in the first step. It is enough.

FIG. 2 shows a method of manufacturing a chain plate material for a silent chain, which is an example of the side edge shape of the chain plate according to the present invention. First, a bar material 1 such as a round bar or a wire is used. By rolling with a die roll, a tooth-shaped concave portion 2'formed by silent chain plates connected in the longitudinal direction in the longitudinal cross-sectional shape and a concave groove 3'for separating and cutting into individual chain plates are simultaneously provided. By molding and then rolling the bar material 1 into a strip plate material 4 ', a cutting groove 3', a tooth profile recess 2'and a tooth profile are formed on one side edge of the strip plate material 4 ', and a cutting groove 3 is formed on the other side edge. 'Is molded respectively. Then, each silent chain plate material 5'can be obtained by cutting from the cutting groove 3 '.
It should be noted that other asymmetrical chain plate materials can be manufactured by the same method.

[0012]

According to the method of manufacturing a chain plate material of the present invention, a chain plate having a desired shape is formed in advance by plastic working of a longitudinal cross-sectional shape of a rod-shaped or linear material. After being formed into an uneven shape on both edges, the flat material is rolled or forged into a plate material, and therefore, the plate material is provided with an uneven shape having a substantially desired shape on the side edges in the longitudinal direction. By cutting and separating the material of the chain plate by making it match, it is possible to significantly reduce the cut-off portion at the time of separation, and it is possible to greatly improve the yield of the conventional material described above, and it was possible to achieve material savings. It is a thing. Further, since the chain plate material is formed into a desired shape by plastic working, the fiber direction of the material flows in the longitudinal direction along the shape without being divided, and the fatigue strength of the material is It can be remarkably improved by the chain plate.

[Brief description of drawings]

FIG. 1 is an explanatory view of a method of manufacturing a symmetrical chain plate material according to the present invention.

FIG. 2 is an explanatory view of a method for manufacturing an asymmetrical chain plate material according to the present invention.

[Explanation of symbols]

 1 bar material 2 gourd-shaped recess 2'tooth-shaped recess 3, 3'cutting groove 4, 4 'band-shaped bar 5, 5' chain plate material

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takeshi Matsumoto 4-17 96 Tsurumi, Tsurumi-ku, Osaka-shi, Osaka Prefecture Tsubakimoto Chain Co., Ltd. No. 96 in Tsubakimoto Chain Co., Ltd.

Claims (1)

[Claims] 1. A first step of forming a longitudinal cross-sectional shape of a bar material into a concavo-convex shape on both sides formed by plastic working a chain plate of a desired shape, and the plastically processed bar. The second step of forming a strip-shaped plate material having the irregular shape in the lengthwise side edge shape by a rolling process, and a chain plate material having a desired shape by cutting the strip-shaped plate material in conformity with the irregular shape of the side edge A method of manufacturing a chain plate material, comprising: