JPS6161709A - Method of cutting pipe material - Google Patents

Abstract

PURPOSE:To prevent a pipe material from being deformed and being burred, by fixing a plastic material having a diameter corresponding to the inner diameter of the pipe material, in the latter, so that the pipe material is cut as a solid-like material. CONSTITUTION:A resin material 4 having an outer diameter corresponding to the inner diameter of a pipe material 2 is fixed in the latter before cutting, and therefore, the pipe material 2 is formed as a solid-like material. The thus solid-like formed pipe material is pushed into a cutting device which is not shown, and is then cut at a predetermined cutting position. After the resin material is pulled out, the pipe material is forged into a predetermined shape by a die device which is not shown. Since the pipe material is cut after it is formed into a solid-like form, it is possible to the pipe material from being deformed and burred.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pipe material cutting method for cutting a wire-shaped pipe material into predetermined dimensions.

[Conventional technology]

Conventionally, the method of cutting pipe materials generally involves cutting with a knife, and in particular, cutting 1 gram of pipe material
A method of making a cut at the rA location, then shearing along the cut groove, and cutting has been evaluated.

[Problem that the invention seeks to solve]

However, when cutting with a knife is used, "burrs" etc. occur on the cut surface of the pipe material, and the "burrs" adhere to the mold during the forging process of the pipe material, and additional processing is required to remove them. , which makes it difficult to take appropriate measures, increases material loss, and inevitably increases component costs.

In addition, even when using the cutting method after notching, even if the notching is performed as a pre-process of shearing to reduce the shear stress during shearing and alleviate the force, the pipe material will not have hollow holes. As long as the material has However, there were drawbacks such as deformation of the circumferential cross-sectional shape and deformation of the pipe material.

[Means for solving the problem] Resin +4 having an outer diameter corresponding to the inner diameter of the pipe material is fixed to the pipe material, and the pipe material is sheared at the cut point together with the resin material. This is a method of cutting.

(Function) By fixing a resin material to a pipe material and making the pipe material a solid material, deformation of the shape of the pipe material is prevented, the desired shape is maintained, and the drawbacks of the conventional method are eliminated.

〔Example〕

Examples will be described below based on the drawings.

In FIGS. 2 and 3, (1) is a heading machine,
The pipe material (2) in the form of a wire is cut into a predetermined size, the tip of the pipe material (2) is subjected to a forging process, and the tip is expanded to produce a hollow part (3). ing.

The heading machine (1) includes a cutting device (6) and an ejecting pin (7).
) and the die device (8). The cutting device (6) consists of a tile (9) and a knife (10), and a stopper (
11) is placed at a predetermined position. Further, the ejecting pin (7) is formed into a "4" structure so that it can freely move forward and backward through the hollow hole (5) in the pipe material (2) after cutting.Furthermore, the die device (8) , consists of an upper mold (12) and a lower mold (13).

On the other hand, in FIG. 1, a resin material (4) having an outer diameter that matches the inner diameter of the pipe material (2) is inserted into a hollow hole (5) in the pipe material (2) before cutting. The resin material (4) is configured to adhere to the hollow hole (5) of the pipe material (2).

When cutting the pipe material (2) in the heading machine (1) configured as described above, first, as shown in Fig. 1, the resin material (4) is inserted into the wire-shaped pipe material (2). The hollow hole (5) in the pipe material (2) is formed by the resin material (4).
to make the pipe material (2) solid.

Next, as shown in FIG. 3(A), the pipe material (2)
Push the tip of the pipe (9) to the stopper (11), set the cutting position of the pipe material (2), and then
The knife (10) is moved up and down to the cutting point of the pipe material (2), and the resin material (4) and the resin material (4) are integrally sheared to cut the pipe material (2).

Furthermore, as shown in FIG. 3(B), a protruding pin (7)
is inserted into the hollow hole (5) in the cut pipe material (2), and the resin material (4) in the hollow hole (5) in the pipe material (2) is protruded and extracted.

After completing the removal work of this resin material (4),
) back into place.

Thereafter, as shown in FIG. 3(C), the pipe material (2) cut to a predetermined size is transferred to a die device (8),
It is pressed into a predetermined shape.

[Effects of the Invention] As explained above, the present invention inserts a resin material into a pipe material, fixes the resin material in the hollow hole of the pipe material, makes the pipe material solid, and applies shear stress to the pipe material. Because we use a method of processing and cutting the pipe material, the hollow holes in the pipe material are filled with resin material, and the pipe material becomes a solid material.
The shearing stress during shear processing applies a uniform load to the circumferential cross section of the pipe material at the cut point, which not only prevents the occurrence of burrs, but also reduces the circumference at the cut point. It can be cut without causing any deformation in the cross-sectional shape.

In addition, a resin material corresponding to the inner diameter of the pipe material is fixed over the entire length of the hollow hole, making the pipe material solid.
Not only can the deformation of the shape on the circumferential cross section of the pipe material as described above be prevented, but also the shape can be maintained over the entire length of the pipe material. As a result, without adding any equipment to the manufacturing machine: just by adding inexpensive materials to the pipe material,
The pipe material after cutting can also be shaped into a desired shape, and parts with more stable quality can be produced at lower cost.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part of the present invention, FIG. 2 is a schematic diagram of the present invention, and FIG. 3 is a process diagram of the present invention. (1) Heading machine (2) Pipe material (3) Parts
(4) Resin material (5) Hollow hole (6) Cutting device (7) Ejector pin (8) Die neck (9) Tile (10
) Knife (11) Stopper (12) Upper mold (13
) Lower mold patent applicant Nitto Seiko Co., Ltd. Figure 3

Claims (1)

[Claims] A resin material (4) having an outer diameter approximately equal to the inner diameter of the pipe material (2) is inserted into the hollow hole (5) of the pipe material (2) and fixed, and the pipe material (4) is integrally attached to the resin material (4). A method for cutting a pipe material, characterized in that the pipe material (2) is cut by applying shearing to the cutting location of 2).