JPS6258477B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Technical Field) The present invention relates to a method for manufacturing a bimetal made by arranging and joining a plurality of metal members having different coefficients of thermal expansion in parallel.

(Prior Art) For example, juxtaposed bimetals are used to elastically support a color selection mask on a face panel in a color television picture tube.

As shown in Fig. 1, a conventional parallel bimetal has two elongated plates A and B made of metals with different coefficients of thermal expansion arranged in parallel.
are joined by welding along the longitudinal direction, and are displaceable in the width direction. When manufacturing this juxtaposed bimetal, the materials for plates A and B are individually rolled to the final thickness, and then these materials are lined up and joined by electron beam welding or plasma welding, and the joined parts are The bimetal is obtained by cutting it to a predetermined length in the longitudinal direction.

(Problems to be Solved by the Invention) Such conventional parallel bimetals have the following problems. That is, since the plates A and B are joined in parallel, the plates A and B are likely to warp in the width direction due to the heat of welding, and the bimetal operation may be distorted. Furthermore, since the welding depth of the joint C, that is, the welding part, between the plates A and B in this parallel bimetal is large, corresponding to the thickness of the plates A and B, seam welding with good work efficiency is required. Therefore, it is necessary to perform other welding methods that have low work efficiency.

The present invention was made based on the above circumstances, and
The present invention provides a method for manufacturing a bimetal that is less likely to warp and can be seam welded.

[Purpose of the invention]

(Means and effects for solving the problem) The bimetal manufacturing method of the present invention uses a metal rod that is less likely to warp and has the highest strength against external forces as a member constituting the bimetal. The rods are lined up in parallel and joined by seam welding at joints that make line contact along the axial direction, and then compressed to produce a juxtaposed bimetal.

A case will be described in which a parallel bimetal is manufactured by the manufacturing method of the present invention.

First, high expansion metal such as nickel-chromium
An ingot made of an iron alloy and an ingot made of a low-expansion side metal, e.g., a 35 to 37% iron alloy by weight, are individually hot extruded or hot rolled and cold drawn or cold rolled to a predetermined diameter. Long round rods 1 and 2 having a diameter of 1.5 mm are formed respectively. Next, as shown in FIG. 4, the round bars 1 and 2 are arranged in parallel and arranged in line contact with each other along the axial direction. Then, the arranged round bars 1 and 2 are continuously moved between a pair of disc electrodes 5 and 5 in the seam welding machine, and the round bars 1 and 2 are moved by the disc electrodes 5 and 5.
The round bars 1 and 2 are joined to each other by performing seam welding on the joining portion 3 that makes line contact along the axial direction of the two.

Then, by cutting the raw material of the round bars 1 and 2 that are joined together to a predetermined length in the axial direction, a structure composed of the round bars 1 and 2 as shown in FIGS. 2 and 3 is formed. do. In this structure, a welded part 4 is continuously formed at a joined part 3 of the round bars 1 and 2 along the axial direction.

Thereafter, the joined round bars 1 and 2 are rolled by rolling rollers 6 and 6 as shown in FIG. As a result, it is possible to form a juxtaposed bimetal by rolling the round bars 1 and 2 into a flat plate shape, arranging the two flat plates in parallel, and joining them in the longitudinal direction.

The juxtaposed bimetal thus manufactured is used, for example, as a member for elastically supporting a color selection mask of a color television picture tube on a face panel.

Therefore, the juxtaposed bimetal manufactured by the manufacturing method of the present invention uses the round bars 1 and 2 as bimetal constituent members during welding, that is, it is the most stable against deformation and is resistant to external forces acting from all directions around the axis. A bar with a circular cross section is used, which is uniform and has the highest strength. Therefore, in the process of manufacturing this parallel bimetal, the round bars 1 and 2 are less likely to warp due to the heat of seam welding during joining, and the produced parallel bimetal can be prevented from distorting its displacement operation due to warping. Furthermore, since the joining portion 3 of the round bars 1 and 2 is in line contact during joining, the thickness of the joining portion is small, so seam welding is possible. That is, seam welding has the advantage of being highly efficient because welding can be performed continuously by moving the objects to be welded.

(Example) Next, an example of manufacturing the bimetal of the present invention will be described.

A 3φ wire made of amber (36% Ni-Fe) was prepared for the low expansion side, and a 3φ wire made of 8Ni-18Cr-Fe alloy was prepared for the high expansion side. These were passed between opposing grooved roll electrodes and seam welded. The applied force was 1000Kg and the welding current was 20000A. The obtained bimetal was firmly joined. The obtained bimetal was made into an elliptical cross section using a rolling roll, cut into 100 mm pieces, and its operation was confirmed. The obtained bimetal had sufficient functionality as a parallel bimetal.

〔Effect of the invention〕

As explained above, according to the bimetal manufacturing method of the present invention, a parallel bimetal is manufactured by arranging a plurality of metal rods in parallel, joining them by welding, and then subjecting them to compression processing. Compared to the conventional manufacturing method of manufacturing parallel bimetals by arranging them in parallel and joining them by welding, there is less warpage during welding and joining, and it is a joining method that could not be considered with the conventional manufacturing method of parallel bimetals. The rod bodies can be welded and joined by seam welding, making it possible to carry out efficient joining work and to obtain a bimetal that performs highly accurate bimetal movement.

[Brief explanation of the drawing]

Figure 1 is a perspective view showing a conventional parallel bimetal;
2 to 5 show the manufacturing method of the present invention,
Figures 2 and 3 are a perspective view and a side view showing the joined state of the round bars, Figure 4 is an explanatory diagram showing the welding process of the bimetal of the present invention, and Figure 5 is a rolling process of the joined round bars. It is a perspective view showing a state. 1, 2...Round bar, 3...Joint part, 4...Welded part.

Claims (1)

[Claims] 1. A plurality of metal rods having different coefficients of thermal expansion are arranged in parallel and in line contact with each other along the axial direction, and these adjacent metal rods are in line contact along the axial direction. A method for producing a bimetal, comprising: welding and joining the joined parts, and then subjecting the joined metal rod to compression processing. 2. The method for manufacturing a bimetal according to claim 1, wherein the metal rod is a round rod.