JPS62151587A - Bimetal parts - Google Patents

Abstract

PURPOSE:To differentiate the joined different constituent metals of bimetal according to color by subjecting one side of the bimetal to mechanical processing or chemical treatment so as to give different temper colors. CONSTITUTION:A metal causing higher expansion and a metal causing lower expansion are joined together by hot pressure welding or other method. The joined metals are cold worked and sintered. After only one side of the sintered body is subjected to mechanical processing or chemical treatment, the sintered body is formed into prescribed dimensions and heat treated to obtain bimetal having metallic surfaces which are different from each other in color.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a bimetal component in which the low expansion metal and the high expansion metal have different temper colors.

[Technical background of the invention and its problems] Bimetals are used as temperature-sensitive elements that can convert temperature changes into mechanical displacement and force in household appliances, automobiles, thermostats, and all other fields, such as ON-OFF switches. It is widely used for operation, opening and closing of valves, etc.

Conventionally, the high WpJ side metal and the low expansion side metal of this bimetal have been made of M4 in the same color, so in order to distinguish between these two types, it was done by printing and distinguishing them. .

However, this method requires a printing process, which complicates the manufacturing process. In addition, when unmarked materials are used, high expansion metals and low expansion metals must be processed after the parts are processed. There were problems in that it became impossible to distinguish the side metals, making it difficult to use.

[Purpose of the Invention] In the production of bimetals, the present inventors have developed bimetal parts with different temper colors by using different surface treatment methods for each metal surface for the high-expansion side metal and the low-expansion side metal. I found out.

The present invention has been made based on the above findings, and an object of the present invention is to provide a bimetal component that allows high expansion metals and low expansion metals to be distinguished by color.

[Invention! R Required] In other words, the bimetal parts of the present invention are bimetals made by bonding multiple types of metals with different coefficients of linear expansion, and each metal surface is mechanically or chemically treated on one surface. Features.

The two types of metals used in the present invention may be those that are normally used as metals for bimetals. For example, as high expansion metals, Mn-CLI-N i , N
i-Mn-Fe, Ni-Cr-Fe, N1
Examples of low expansion metals include 36Ni.
-Fe (amber), 39N i -Fe, 42N
Examples include metals such as i-Fe and cr-Fe. These are appropriately selected depending on the bimetal characteristics required by the equipment to be used.

Further, the surface treatment of each metal surface is performed by mechanically processing only one surface, and examples of this processing method include belt grinder, tampling, etc. In addition, mechanical treatment only needs to be applied at least in the final step of surface treatment, for example, chemical treatment is first applied as surface treatment,
Mechanical treatment may then be performed.

For the other surfaces of each metal surface, a chemical treatment of 1 MV is preferable, and this treatment method includes, for example, a pickling bath in a hydrochloric acid tank, a reducing atmosphere such as hydrogen gas or a mixed gas of hydrogen gas and nitrogen gas. An example of this is internal annealing.

Further, the surface treatment may be performed on each of the high-expansion side metal and the low-expansion side metal before joining, or after joining. When performing surface treatment before joining, each metal plate is mechanically treated on one side and chemically treated on the other, then joined by cold pressure welding, then rolled to the specified size, Perform heat treatment. In addition, when surface treatment is performed after joining, each metal plate is joined by hot pressure welding, and then the joined body is chemically treated as a whole, and then only one metal surface is further mechanically treated.

Alternatively, when performing chemical treatment, only one metal surface is prevented from being chemically treated by a method such as masking, and then this surface is subjected to mechanical treatment.

In this way, each metal surface has been subjected to different surface treatments, and after rolling it to a predetermined size, it is heat treated to create a complete product. Further, in the step, rolling may be performed before the surface treatment.

[Embodiments of the invention] Next, examples of the present invention will be described.

Example Using a Ni-Cr-Fe alloy as the high expansion metal and a 36Ni-Fe alloy as the low expansion metal, two metal pieces were joined by hot pressure welding, and then the whole was pickled with hydrochloric acid. Then, after cold working and annealing, only the metal surface on the high expansion side was polished using a belt grinder to perform mechanical treatment.

Next, it is rolled and formed into a predetermined size, and then in an atmospheric atmosphere.
When heat treated at 315° C. for 1 hour, the metal surface on the high expansion side became dark blue, and the metal surface on the low expansion side became straw colored.

In addition, in the above example, a bimetal part was manufactured in the same manner as in the example except that only the metal surface on the low expansion side was polished with a belt grinder. A bimetallic part with a dark blue surface was obtained.

Comparative Example 1 A bimetal component was manufactured in the same manner as in the example except that no mechanical surface treatment was performed, and a bimetal component with straw collars on both fully curved surfaces was obtained.

Comparative Example 2 A bimetallic part was manufactured in the same manner as in the example except that the pickling was not carried out and mechanical treatment was applied to both full-bent surfaces, and a dark blue bimetallic part was obtained on both full-bent surfaces. It was done.

"Effects of the Invention" As explained above, the bimetal parts of the present invention have different temper colors for the high expansion metal and the low expansion metal, so they can be easily distinguished, and the difference in temper color can be easily distinguished through simple processing operations. It is industrially advantageous because it can be achieved with

Agent Patent Attorney Noriyuki Kon Same Yukio Yuyama

Claims (1)

[Claims] (1) A bimetal component made by joining multiple types of metals with different coefficients of linear expansion, characterized in that the final surface treatment of each metal surface is mechanically or chemically treated on one surface.