JPH05177269A - Method for processing aperture of tube - Google Patents

Abstract

PURPOSE: To provide a method for working a pinhole and a circular hole or the like in a curved surface body such as a tube stock. CONSTITUTION: An upper fixing jig 8 and a lower fixing jig 9 respectively having jig grooves 8', 9' having the diameter coinciding with the outer diameter of a tube stock to be worked in each inner part of a pair of nearly square shaped metal regulus members, a die hole 10' penetrating with duplication a part of the circumference of the jig grooves 8', 9' in the inner surface side of the upper fixing jig 8 and the lower fixing jig 9, a die 10 reciprocating in the die hole 10' and a connecting means such as a hinge 11 for connecting the upper fixing jig 8 to the lower fixing jig 9 at one side are arranged, and the moving path of the die 10 passes through the inside of a part of the circumference of the jig grooves 8', 9'.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a pinhole, a circular hole or the like on a curved body such as a pipe material.

[0002]

2. Description of the Related Art Conventionally, in order to machine a pin hole, a circular hole, etc. in a pipe material, a pipe material, etc., a flat cut metal plate is punched with an opening and processed by a drill ring etc. Manufactured by a sheet metal method that bends and welds with, and a press work method that processes with an external die that matches the opening shape processing part of the mend rail while inserting and supporting a mend rail that fits the inner diameter of the pipe material. I've been

[0003]

The prior art is illustrated in FIGS. 1 and 2. In the sheet metal method as described above, after the forming of the punching opening 2 is completed, the metal plate 1 must be bent and welded at an appropriate radius, so that the number of processing steps increases and thermal deformation of the welded portion also occurs. In addition, there is a problem that it cannot be used in a repetitive work environment, and productivity is low.

The pipe material 4 is also used in the working by the press working method.
It is necessary to process with the ment rail 3 and the die 5 having different diameters depending on the diameter. Since a repetitive work of inserting the mend rail at each work and removing it after the work is required, the working efficiency is low.

Particularly, when a fine tube material for an automobile condenser as shown in FIG. 3 is processed, great caution is required of the operator. FIG. 3 shows an example of a processed material that illustrates the difficulty of such processing.

Since the vertical pipe material 7 of the condenser of the automobile is processed by opening only a part of the circumference, a large number of cooling tubes 6 in the vertical and horizontal directions are inserted.

Thus, in order to process a large number of openings on the side of the pipe material, the conventional method has a low productivity, so that a separate production processing system is required.

It is an object of the present invention to provide a method of processing an opening in a new pipe material, pipe material or the like rather than the conventional processing method.

[0009]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention has a jig for gripping a single pipe member and has an upper fixing jig and a lower fixing jig. Since the upper fixing jig and the lower fixing jig form a fixing jig for one pipe material, a jig groove for fixing the pipe material is formed on the inner surface of each of the upper fixing jig and the lower fixing jig. Sometimes prevent slipping of tubing.

Since the upper fixing jig and the lower fixing jig are connected to one side by a hinge or the like so as to be easily attached and detached, repetitive processing is possible. The upper fixing jig and the lower fixing jig are preferably made of rectangular metal molds.

A die hole is drilled in the upper fixing jig and the lower fixing jig to guide the die.

The die holes formed by the upper fixing jig and the lower fixing jig are mirror-finished to reduce wear due to repeated machining of the die.

Since a part of the entire circumference of the jig groove formed by the upper fixing jig and the lower fixing jig is cut by the straight path of the die hole, this cut portion becomes an opening processing portion of the pipe material.

[0014]

In the pipe material opening processing method of the present invention, a part of the entire circumference of the jig groove formed by the upper fixing jig and the lower fixing jig is cut by the straight path of the die hole. The cut portion L becomes an opening processing portion of the pipe material P. In the case of machining, the pipe or pipe is inserted into the jig groove and the opening of the specified diameter is easily formed in the pipe by one reciprocation of the die. This is a useful method for processing members that require a large number of openings, such as the above-mentioned automobile condenser, in order to ensure economic efficiency.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In one embodiment of the present invention as shown in FIG. 4, 8 is an upper fixing jig and 9 is a lower fixing jig. The upper fixing jig 8 and the lower fixing jig 9 form a fixing jig for one pipe material P, and jig grooves 8 ', 9'for fixing the pipe material P are provided on the inner surface sides of the upper fixing jig 8 and the lower fixing jig 9, respectively. It is formed on the inner surface of the jig to prevent the pipe material from slipping during processing.

Since the upper fixing jig 8 and the lower fixing jig 9 are connected by a hinge 11 or the like so that they can be easily attached and detached, repetitive processing is possible.

A die hole 10 'is formed in the upper fixing jig 8 and the lower fixing jig 9 to guide the die 10.

The die hole 10 'formed by the upper fixing jig 8 and the lower fixing jig 9 is mirror-finished, so the die 10
Wear due to repeated machining is reduced.

A part of the entire circumference of the jig grooves 8 ', 9'consisting of the upper fixing jig 8 and the lower fixing jig 9 is the die hole 1
Since the shape is cut by the straight path of 0 ', this cut portion L becomes the opening processing portion of the pipe material P.

[0020]

According to the present invention, a pinhole, a circular hole or the like can be easily formed on a curved body such as a pipe material.

[Brief description of drawings]

FIG. 1 is a perspective view illustrating a conventional method for processing an opening portion of a pipe material.

FIG. 2 is a perspective view illustrating another conventional method for processing an opening of a pipe material.

FIG. 3 is an exploded perspective view illustrating the configuration of an automobile condenser to which the pipe material opening processing method of the present invention is applied.

FIG. 4 is a cross-sectional view illustrating a method for processing an opening of a pipe material according to the present invention.

[Explanation of symbols]

 8 Upper fixing jig 9 Lower fixing jig 8 ', 9'Jig groove 10 Die 10' Die hole 11 Hinge

Claims (1)

[Claims] 1. An upper fixing jig 8 and a lower fixing jig each having jig grooves 8 ', 9'having a diameter corresponding to the outer diameter of a pipe material to be machined inside each of a pair of substantially quadrangular metal block members. 9. Die hole 10 'which partially penetrates the circumference of jig grooves 8', 9'on the inner surface side of the upper fixing jig 8 and the lower fixing jig 9 and reciprocates in the die hole 10 '. The die 10 is provided with connecting means such as a hinge 11 for connecting the upper fixing jig 8 and the lower fixing jig 9 on one side.
Of the jig groove 8 ', 9'passes through the inside of a part of the circumference of the jig groove 8', 9 '.