JPH0763892B2 - Method for manufacturing wire for wire saw - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for manufacturing a wire for a wire / saw, and more specifically, a tin plating layer is peeled off from the surface of a core wire for a wire / saw wire. It provides a means of forming without any.

[Prior Art] A wire for a saw is used as a tool for cutting a fragile work made of a magnetic material such as ferrite or amorphous. The wire / saw wire (1) is a high carbon steel core wire (2) having a tin plating layer (3) formed on its surface, as shown in FIG. 3 as a cross-sectional view. When manufacturing a wire for a saw / saw (1), a fine wire of high carbon steel is used as a base material of the core wire (2) for the purpose of drawing the fine wire by drawing, modifying the crystal structure and adjusting hardness. The desired heat treatment (patenting) is repeated a predetermined number of times, and a tin met layer (3) is applied to the surface of the core wire (2) before the final finish wire drawing or after the finish wire drawing to obtain a desired wire. The wire (1) for a wire saw having a warp is formed.

The tin-plated layer (3) is a coating layer generally used for the purpose of preventing the hard core wire (2) from being exposed and the work from being damaged by the hard metal surface layer. By functioning as a buffer layer or a carrier layer for the diamond abrasive grains dispersed in the paste used as an auxiliary cutting medium when cutting
This contributes to maintaining the cutting ability of the wire / saw wire (1) and the machining accuracy of the work.

[Problems to be Solved by the Invention]

As mentioned above, it is necessary to form the tin plating layer as the surface layer of the wire core wire for the wire saw, but since there is a considerable gap in the elongation of the tin plating layer and the core wire, In the production of wires, when a tin-plated layer is provided on the surface of the core wire prior to the final finish wire-drawing step, the tin-plated layer is easily squeezed by a wire-drawing die and peeled off. For this reason, it becomes difficult to maintain the cutting ability of the wire for the wire saw and the machining accuracy of the work. Also,
If the tin plating layer is formed on the surface of the core wire after the final finish drawing, it is difficult to obtain the dimensional accuracy of the tin plating layer and the adhesion strength of the tin plating layer is small. As in the case of the above, sufficient service life was not obtained.

[Means for Solving the Problems]

As a means for solving the above problems, the present invention has a thickness of 15 to 20 μm on the surface of a high carbon steel core wire with a copper underlayer having a thickness of about 1 μm interposed.
m tin plating layer is formed, wire drawing and heat treatment are repeated a predetermined number of times, a copper coating layer having a thickness of 1 to 3 μm is laminated on the tin plating layer prior to final drawing, and the tin is further added. The present invention provides a method for manufacturing a wire for a wire saw, which comprises drawing a wire so that the plating layer has a thickness of 5 to 8 μm and is exposed to a substantially surface layer.

[Action]

A tin-plated layer on the surface of the core wire prior to final drawing
A copper coating layer formed by plating is laminated, and this copper coating layer is used as a peeling prevention layer for the tin plating layer in the subsequent wire drawing step.

〔Example〕

FIG. 1 is a schematic cross-sectional view of a wire for a saw wire manufactured by the method of the present invention, and FIG. 2 is a process diagram illustrating the method of the present invention.

In FIG. 1, (10) is the body of the wire / saw wire, and (11) is the surface of the core wire (13) to improve the familiarity between the tin plating layer (12) and the core wire (13) made of high carbon steel. The plated underlayer is formed on the surface of the tin plating layer (12), and the plated copper outer layer is formed on the surface of the tin plating layer (12).

The core wire (13) is drawn with a die at an appropriate reduction ratio,
After the patenting treatment is repeated to draw the wire to form the tin plating layer (12) and the copper outer coating layer (14) by plating, finish wire drawing is performed without performing the patenting treatment.

The diameter of the finally obtained wire / saw wire (10) is selected according to the application, but is generally about 0.1 to 0.3 mm. In addition, the thickness of the tin plating layer (12) formed on the surface of the core wire (13) prior to the finished wire drawing is 3 to 4 times the thickness of the finished tin plating layer (12) of 5 to 8 μm. To be about 15 to 20 μm. And
Corresponding to the tin plating layer (12) having the above coating thickness,
Copper coating layer by plating formed on its surface (14)
Has a function of preventing the tin-plated layer (12) from peeling off during the finish wire-drawing, and hardly remains on the tin-plated layer (12) after finishing the wire-drawing. 1
To about 3 μm.

On the other hand, the copper underlayer (11) consists of the core wire (13) and the tin plating layer (1).
2) It is an intermediate layer for better compatibility with, and the thickness is 1μ.
It may be set to about m.

Hereinafter, the present invention will be described based on specific examples.

The core wire base material (13) consisting of a piano wire with a diameter of 1.2 mm is subjected to patenting treatment, and then drawn to a diameter of 0.42 mm.
An intermediate groove body (10A) of a saw wire (10) is manufactured. Then, on the surface of the intermediate groove body (10A), a copper underlayer (11) having a thickness of 1 μm and a tin plating layer (1 having a thickness of 1 μm) were formed.
2), a copper coating layer (14) having a thickness of 2 μm is sequentially laminated. Intermediate groove body (10A) thus obtained
For wire saws with a tin plating layer (12) having a thickness of 5 to 8 μm exposed to the surface by finish wire drawing until the diameter becomes 0.22 mm as shown in FIGS. 1 and 2. A wire (10) was obtained. Copper coating layer by plating (14)
Protects the tin plating layer (12) from the core wire (13) in the final wire drawing process so that it is firmly pressed without peeling, and at the final stage, most of the outer coating layer itself is peeled and removed. To be done.

Incidentally, a part of the peeled copper outer coating layer (14) is embedded in the tin plating layer (12), or the tin plating layer (12).
Even if it is extremely thin and remains on the top, it does not matter for the purpose of use.

〔The invention's effect〕

The wire / saw wire produced by the method of the present invention has the copper coating layer formed by plating in the final finish drawing step functioning as a peeling-preventing film for the tin-plated layer,
A tin plating layer is formed on the surface of the core wire with a uniform thickness and firmly. As a result, it becomes easy to control the thickness of the tin-plated layer, the cutting ability of the work, the reduction of cutting loss and the processing accuracy are significantly improved.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of a wire for a saw wire manufactured by the method of the present invention, and FIG. 2 is a process diagram illustrating the method of the present invention. FIG. 3 is a schematic cross-sectional view of a wire for a saw wire manufactured by a conventional method. (10) …… Wire / saw wire, (11) …… Plated copper underlayer, (12) …… Tin plated layer, (13) …… Core wire, (14) …… Plated copper coating layer.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shigeki Yamamura 1410 Inada, Katsuta City, Ibaraki Prefecture In the Tokai factory of Hitachi, Ltd. (56) (JP, Y2)

Claims (1)

[Claims] 1. A tin-plated layer having a thickness of 15 to 20 μm is formed on the surface of a high carbon steel core wire through a copper underlayer having a thickness of about 1 μm, and wire drawing and heat treatment are repeated a predetermined number of times for final finishing. Prior to wire drawing, a copper coating layer having a thickness of 1 to 3 μm is laminated on the tin plating layer, and the tin plating layer has a thickness of 5 to 8 μm.
The method for producing a wire for a wire-saw is characterized in that the wire drawing process is performed so that the wire is exposed to a substantially surface layer.