JPH05220628A - Manufacture of pipe part - Google Patents

Abstract

PURPOSE:To provide a manufacturing method having a good efficiency of pipe parts made of noble metal where there are no deformation, no burrs, no minute burrs in pipes/on the external circumferential end part nor wave-shaped traces, and the cut surfaces are excellently finished. CONSTITUTION:When pipe parts 8 of the specified dimensions are manufactured by executing the wire-cutting (electric discharge machining), a composite wire material consisting of three layers where a core member 7 and a casing member 9 are made of the soluble metal are manufactured, and then, the composite wire material is cut to the specified dimension through the wire-cutting (electric discharge machining). Then, the core member 7 and the casing member 9 are dissolved and removed through pickling, to make the pipe parts 8.

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 small diameter pipe, and more particularly to a method for manufacturing a pipe having a good cut surface finish such as a medical precious metal pipe.

[0002]

[Prior Art and Problems] Conventional pipe cutting has been performed with a pipe cutter, a cutting tool, etc., but since deformation and burrs occur,
The pipe was cut by wire cutting (electric discharge machining). However, as shown in FIGS. 4 and 5, when the cutting is completed, burrs 1, egre 2 and the like are generated, and thereafter, the burr 1 and the like are removed, so that a polishing step or the like is required, which is complicated and deforms at that time. I was doing it. Further, in wire cutting (electric discharge machining), as shown in FIG.
There were problems such as minute burrs 4 on the outer peripheral edge, and a wavy trace 6 on the cut surface due to changes in the discharge conditions due to the running of the wire on the cut surface. Particularly in the case of precious metal pipes with a small diameter for medical purposes, the finish of the cut surface is an important point from the functional aspect, and improvement in this point has been demanded.

[0003]

SUMMARY OF THE INVENTION The present invention is free from deformation and burrs, and
(EN) Provided is a method for producing a noble metal pipe part having a small diameter and having a good cut surface finish, which is free of minute burrs and wavy traces in the pipe and the outer peripheral end thereof, and has a high production efficiency.

[0004]

SUMMARY OF THE INVENTION The technical means of the present invention for solving the above-mentioned problems is to manufacture a pipe part having a predetermined size by cutting by wire cutting (electrical discharge machining), and a core material, an intermediate layer material and an outer jacket. After being made into a three-layer composite wire material, the wire material is cut into a predetermined size by wire cutting (electric discharge machining), and then acid treatment is performed to dissolve and remove the core material and the jacket material to form a pipe part. To do.

[0005]

According to the present invention constructed as described above, since the core material and the jacket material are provided, burrs and the like at the end of cutting are not generated in the intermediate layer material, and the inner and outer circumferences of the pipe are No minute burr at the end is generated, and since the discharge conditions do not change, no wavy traces on the cut surface are generated. The same effect can be obtained by forming a two-layer composite wire with the core material and then further plating an outer covering material to form a three-layer composite wire. Further, the material of the core material and the covering material may be copper or the like as long as it can be dissolved and removed by an acid.

[0006]

EXAMPLES Examples and conventional examples will be described below. First, as an example, material PtIr10%, outer diameter 1.8 mm, inner diameter
A Cu material and a core material having an outer diameter of 1.45 mm were inserted into a pipe material having a diameter of 1.5 mm and drawn to obtain a two-layer composite wire having an outer diameter of 1.5 mm. After that, Cu plating is performed to provide a Cu material and an outer jacket material having a thickness of 0.15 mm to obtain a three-layer composite wire 10 including a core material 7, a pipe material 8 and an outer jacket material 9 as shown in FIG. Next, using a wire-cut electric discharge machine using a wire 11 of W (tungsten) and a wire diameter of 0.07 mm, cut it to a length of 3 mm as shown in FIG.
The core material and the jacket material were dissolved and removed by acid treatment with dilute nitric acid to obtain a pipe component as shown in FIG.

On the other hand, as a conventional example, as shown in FIG. 4 and FIG. 5, a pipe material 3 having a material PtIr10%, an outer diameter of 1.5 mm and an inner diameter of 1.25 mm is cut into a length of 3 mm by the same wire electric discharge machine as in the embodiment. The pipe part 13

However, when a quality inspection of the finish of the cut surface was conducted, in the conventional example, the length of the outer peripheral end of the burr or egre and the pipe having a length of 0.2 mm or more was 0.02 mm to 0.
07 mm burr is generated and the cut surface has a wavy surface roughness.
Whereas an uneven surface of 0.8 μm to 3.2 μm was generated, in the example, there was no surface and the finished cut surface was very good.

[0009]

As described above, according to the method for manufacturing a pipe component of the present invention, since the core material and the jacket material are cut after the cutting, burrs are not generated at the end of the cutting, and the pipe is There are no minute burrs on the inner and outer peripheral edges and no wavy traces on the cut surface. After that, the core material and outer coating material are dissolved and removed by acid treatment, resulting in a good cut surface finish. It has an excellent effect that a precious metal pipe component having a small diameter can be obtained with high production efficiency, and is particularly suitable for a precious metal pipe component having a small diameter for medical use.

[Brief description of drawings]

FIG. 1 is a diagram showing a process of an embodiment of the present invention.

FIG. 2 is a diagram showing a process of one embodiment of the present invention.

FIG. 3 is a diagram showing a process of one embodiment of the present invention.

FIG. 4 is a side sectional view showing a cutting state of a conventional pipe.

FIG. 5 is a side sectional view showing a cutting state of a conventional pipe.

FIG. 6 is a diagram showing a defect in a conventional pipe cutting method.

[Explanation of symbols]

 7 Core material 10 Composite wire 8 Pipe material 9 Outer coating material

Claims (1)

[Claims] 1. Cutting by wire cutting (electric discharge machining),
In manufacturing pipe parts of a specified size, a three-layer composite wire consisting of a core material, an intermediate layer material, and a jacket material is cut into a specified size by wire cutting (electric discharge machining), and then acid-treated to form a core. A method for manufacturing a pipe part, which comprises melting and removing a material and a jacket material.