JPH0280145A - Manufacture of sliding use composite wire - Google Patents

Abstract

PURPOSE:To manufacture an inexpensive sliding use wire by inserting a core material of Cu (alloy) into a pipe made of an alloy of Au, Pt, Ag, Cu and Ni of specific % or an alloy obtained by adding In of specific % to said alloy, and executing the swaging under a specific condition. CONSTITUTION:A core material consisting of Cu (alloy) is inserted into a pipe consisting of an alloy consisting of 65-72% Au, 3-7% Pt, 7-13% Ag, 11-17% Cu and 0.5-5% Ni, or an alloy obtained by adding 0.1-5% In to said alloy, and a wire is formed by working it within a range in which the fractional reduction in area is 5-30% by cold first swaging and executing repeatedly drawing in which a heat treatment temperature is 600-800 deg.C and the fractional reduction in area by swaging is 30-80%. When the fractional reduction in area is small, the joining is inferior, and when it is large, work hardening is caused. When the heat treatment temperature is low, the joining strength becomes weak, and when it is high, said strength becomes brittle. In such a way, an economical sliding use composite wire for which a precious metal is scarcely used can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for manufacturing a sliding composite wire used for commutators and brushes such as micro motors and slip rings.

(Prior art) Conventionally, sliding composite wires used for commutators and brushes such as micro motors and slip rings have been made of Pt.
SAu, Ag, Cu, and Ni-based alloy wires are in practical use because they have good sliding properties.

(Problems to be Solved by the Invention) By the way, since the above-mentioned material is an expensive noble metal alloy, there has been a strong demand for cost reduction from an economical point of view. For this reason, attempts have been made to develop a composite brush wire with a core material made of Cu or Cu alloy, but problems such as cracking during processing, wire breakage, and weak and unstable bonding strength have prevented it from being put to practical use. This was not achieved.

Therefore, the present invention aims to provide a method for manufacturing a composite wire for sliding that can satisfy the above-mentioned needs.

(Means for Solving the Problems) In order to solve the above problems, the method for manufacturing a sliding composite wire of the present invention includes Au65-75w%, Pt3-7wL%.
, A g 7 ~13wL%, Cu1l~
A core material made of Cu or a Cu alloy is inserted into a pipe made of an alloy made of an alloy made of 17 wt%, N10.5 to 1.5 wt%, or an alloy in which In0 is added to this alloy by 11 to 5 wt%, and this is swaged in the cold. It is characterized in that it is made into a wire rod by repeatedly performing processing, heat treatment, and drawing processing.

The area reduction rate in the above first swaging process is 5~
It is preferably within the range of 30%; if it is less than 5%, a good bond cannot be obtained and the efficiency is poor, and if it exceeds 30%, work hardening will occur, and in some cases, cracks will occur, causing cracks and disconnection. This is because In addition, the temperature range for the above heat treatment is preferably 600 to 800°C, and if it is less than 600°C, sufficient hardness cannot be obtained by processing.
In addition, because sufficient diffusion does not occur, the bonding strength is weak and unstable and may break during further drawing processing, and if the temperature exceeds 800° C., it becomes brittle and may crack. It is preferable that the area reduction rate in swaging processing during heat treatment is within the range of 30 to 80%, and 3
If it is less than 0%, there are many steps and efficiency is poor, and if it exceeds 80%, work hardening occurs, resulting in cracks, breaks, and wire breakage.

(Example) An example of the method for manufacturing a composite wire for sliding according to the present invention will be described. A u 7ht%, Pt 5wt%, A g
An alloy consisting of 10wt% Cu, 14wt% Cu, and 1wt% Ni has an outer diameter of 30mm, an inner diameter of 29.2+nm, and a length of 200mm.
+r++n pipe, diameter 29mm, length 200mm
The core material made of phosphor bronze was washed with an organic solvent (in this example, acetone), and then pickled with dilute sulfuric acid, and the core material was inserted into the pipe.

After that, cold swaging process is performed to reduce the outer diameter from 30mm to 2mm.
The diameter was reduced to 6 mm, and this was heat-treated at 750° C. for 1 hour in a non-oxidizing (nitrogen) atmosphere. Furthermore, this material was repeatedly subjected to heat treatment and drawing processing at a processing rate of 75%,
Finally, a composite wire for a brush with a diameter of 0.12 mm was produced (Example 1).

Also, A u 7ht%, Pt 5wt%, A g 10w
t%, Cu13wt%, Ni1wt%, Inlwj% outer diameter 30mm, inner diameter 29.2mm, length 2
00mm pipe, diameter 29mm, length 200mm
Each core material made of copper was washed with acetone and then pickled with dilute sulfuric acid, and the core material was inserted into the pipe. After that, cold swaging is performed to reduce the outer diameter from 30 mm to 25 mm, and this is repeatedly heat-treated at 700°C for 1 hour in a non-oxidizing (nitrogen) atmosphere and at a drawing rate of 35% to finalize the diameter. I made a 0.08mm composite wire for brushes (
Example 2).

On the other hand, Pt5wt%, Δ u 70wt%, A
g 10wt%, Cu 13wt%, Ni 1wt%
, the outer diameter of the alloy consisting of 1wt% In is 30 mm, and the inner diameter is 29
．． 2n+m, length 200n++n pipe and diameter 29
A core material made of phosphor bronze with a length of 200 mm was washed with acetone, pickled with dilute sulfuric acid, and the core material was inserted into a pipe. After that, it is cold swaged and the outer diameter is 30.
When the diameter was reduced from mm to 22 mm, it was impossible to process due to cracks and disconnections (conventional example).

However, when the appearance of Example 1.2 was inspected, it was found that there were no cracks and the bonding strength was sufficient even though the outer diameter was reduced to 173 mm without peeling.

In the above embodiment, a composite wire rod for brushes was produced, but the present invention is not limited to this, and composite wire rods for use in general sliding applications such as commutators may be produced.

(Effects of the Invention) As can be seen from the above explanation, the method for producing a composite wire for sliding according to the present invention has sufficient bonding strength without cracking or disconnection during processing, and therefore has excellent productivity and minimizes the use of precious metals. This has the effect that an economical composite wire for sliding can be obtained.

Applicant: Tanaka Kikinzoku Kogyo Co., Ltd.

Claims (1)

[Claims] 1, Au65-75wt%, Pt3-7wt%, Ag7
~13wt%, Cu11~17wt%, Ni0.5~1
．． An alloy consisting of 5wt% or this alloy containing In0.1-5
Cu or Cu is added to the pipe made of the alloy containing wt%
A core material made of alloy is inserted, and the core material is swaged in a cold state so that the area reduction rate in the first swaging process is within the range of 5 to 30%, and the temperature range of heat treatment is 600 to 800.
1. A method for manufacturing a composite wire rod for sliding, characterized in that the wire rod is produced by repeatedly performing heat treatment at a temperature of 0.degree.