JP2673502B2 - Method for manufacturing ultrafine metal rod with chamfered end - Google Patents

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 an extremely fine metal rod whose edges are chamfered.

[0002]

2. Description of the Related Art For example, a guide pin for connecting plugs in an optical fiber connector is an ultrafine metal rod (stainless steel) having a diameter of 0.6990 mm.
Since its outer diameter is the standard for connecting the connector, submicron accuracy is required.

Then, such a guide pin is cut into a predetermined length and both ends thereof are chamfered, which is conventionally performed by the method shown in FIG. That is, as shown in (1) of FIG. 4, the length L is 70 mm and the diameter D is 0.710 mm.
As shown in FIG. 4B, the metal rod A is first cut into equal lengths by using the ultrafine metal rod A as shown in FIG. Next in FIG.
As shown in the middle (3), chamfer both ends of each rod A '
I do. Then, thereafter, as shown by (4) in FIG. 4, a centerless grinding machine (not shown) until the diameter becomes 0.6990 mm.
It is ground by.

[0004]

However, in the case of such a process, there are the following problems. This is because grinding is performed by a centerless grinder in a process after chamfering both ends of each rod-shaped body A'shown in (3) in FIG. As shown in Fig. 6, the diameter of the central part is reduced, resulting in a difference from the diameter of the central part. In addition, it is also a problem of the centerless grinding machine that both ends of the work are shaved in a taper shape. Also,
C indicates a portion that is cut into a taper shape.

Submicron precision is required for machining ultrafine metal rods having a shaft diameter of 0.6990 mm, and those having a difference in diameter between the center and both ends are high. It cannot be used for parts that require precision.

The present invention has been made in view of the above points, and an ultrafine metal rod whose end is chamfered can be processed to have a uniform diameter as a whole. It is intended to provide a manufacturing method of.

[0007]

SUMMARY OF THE INVENTION Therefore, the gist of the present invention is to first grind an ultrafine metal rod having a predetermined length and diameter to a required diameter by a centerless grinding machine, and then to the metal rod. Both end portions of are cut to the same diameter as the central portion, the central portion is cut into equal lengths, and then the end portions of the cut rod-shaped bodies are chamfered. There is a method for manufacturing an ultrafine metal rod.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a process explanatory view of the present invention, FIG. 2 is a partially enlarged view of a metal rod with both ends cut off, and FIG. 3 is a partially enlarged view of a chamfered rod-shaped body.

In the figure, reference numeral 1 indicates a material length L ₁ of 70 mm,
It is an extremely fine metal rod having a diameter D ₁ of 0.710 mm. In this example, a stainless steel rod is used.

First, the metal rod 1 is made to have a diameter of 0.6 by a centerless grinding machine (not shown) as shown by (2) in FIG.
Grind to 990. Next, as shown by (3) in FIG. 1, both end portions of the metal rod 1 are cut to a position where the diameter is the same as the central portion. 1'and 1'indicate end portions of the metal rod 1 which are tapered and have a smaller diameter than the central portion.

At the same time, the central portion is cut into equal lengths. After that, as shown in (4) in FIG. 1, the cut ends of the rod-shaped bodies 1a are chamfered 2.

[0012]

The present invention has the above-described structure. First, a centerless grinder grinds to a desired diameter, and then a taper portion of an end portion produced during grinding by the centerless grinder is cut to obtain a uniform shape. Only the diameter part is left, and at the same time, the remaining part is cut into equal lengths, and the ends of each cut rod are chamfered, so that all rods have a uniform diameter. It is a thing.

[Brief description of the drawings]

FIG. 1 is a process explanatory view of the present invention.

FIG. 2 is a partially enlarged view of a state where both ends of the metal rod are cut off.

FIG. 3 is a partially enlarged view of a bar-shaped body in a chamfered state.

FIG. 4 is a process explanatory view of a conventional method.

FIG. 5 is a partially enlarged view of a bar-shaped body in a chamfered state according to a conventional method.

FIG. 6 is a partially enlarged view of a rod-shaped body ground by a centerless grinding machine according to a conventional method.

[Explanation of symbols]

 1 metal rod 1a rod-shaped body 2 chamfer

Claims (1)

(57) [Claims] 1. An ultrafine metal rod having a predetermined length and diameter,
First, a centerless grinding machine was used to grind to a required diameter, and then both ends of the metal rod were cut to the same diameter as the central part, and the central part was cut into equal lengths, and then each cut. A method for manufacturing an ultrafine metal rod having a chamfered end portion, characterized by chamfering an end portion of a rod-shaped body.