JPS5921276B2 - Manufacturing method of composite metal strip - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a so-called inlay type composite metal strip in which a metal strip serving as a base metal is bonded to the surface of the other metal strip serving as a clad metal so as to be embedded therein.

Conventionally, as shown in Fig. 1, an inlay-type composite metal strip in which one metal strip 1, which is a base metal, is joined to embed the other metal strip 2, which is a clad metal, on the surface of both metal strips, as shown in FIG. It was manufactured by sequentially rolling the strips 1 and 2 while overlapping them.

However, in the above method, if the thickness of the composite metal strip is 2/2, where the thickness of the embedded metal strip is 2 or more, for example, 0.2 or more, both the composite metal strips are There was a problem where the border line between 1 and 2 was wavy. Moreover, the metal strip 1 that becomes the base metal is copper, and the metal strip 2 embedded in it is soft (if it is a silver strip, this metal strip 2 is
is not sufficiently embedded in the metal strip 1 which extends in the lateral direction and becomes the base metal, making it extremely difficult to increase the composite ratio of 2/tl of the composite metal strip. For this reason, a method has been proposed in which a groove is formed in a metal strip 1 serving as a base metal, a metal strip 2 serving as a clad metal is fitted into the groove, and these metal strips are rolled and joined. According to the method, by forming a deep groove in the metal strip 1 serving as the base metal, an inlay-type composite metal strip with a composite ratio of 2/tl can be obtained.

However, when a composite metal strip is manufactured using this method, the groove side wall of the metal strip 1, which is the base metal, and the metal strip 2, which is the clad metal, may not be sufficiently joined, and this is a problem that needs to be solved. . The present invention was made in view of the above-mentioned circumstances, and its purpose is to strengthen both metal strips when manufacturing an inlay-type composite metal strip with a large composite ratio of 2/tl. The object of the present invention is to provide a method for manufacturing a composite metal strip in which the metal strips are bonded to each other without peeling.

That is, in the present invention, one or more grooves are formed on the joint surface of a metal strip serving as a base metal, and the metal strips of a different material such as the base metal are fitted into the grooves and these metal strips are rolled and joined. In this case, the groove has a rising angle of 15 to 90
The metal strip, which is different from the base metal, has a shape that substantially follows the bottom surface and both side surfaces of the groove, and has a cross-sectional area of Ray i-9/10 with respect to the cross-sectional area of the groove. This is a method for manufacturing a composite metal strip.

The method of the present invention will be explained in detail below with reference to FIGS. 3 to 8.

First, as shown in Figure 3, aluminum, copper, nickel,
A groove 3 is formed in advance in one metal strip 1 (base metal) made of silver, iron, or the like.

In this case, the rising angle θ of the side wall of the groove 3 is usually in the range of 15 to 90 degrees, especially 30
~60 degrees is suitable. Furthermore, the other metal strip 2 (clad metal) that fits into the groove 3 is prepared.

The cross-sectional area S2 of the metal strip 2 is proportional to the cross-sectional area Sl of the groove 3, and the material of the metal strip 2 is the base metal.
Unlike this, for example, if the metal strip 1 is a copper strip, the metal strip 2, which is a clad metal, can be a silver strip, and any combination is possible depending on the required composite metal strip. Furthermore, the cross-sectional shape of the metal strip 2 is, for example, as shown in FIG. As shown in Fig. 4, the hexagonal shape has the lower surface and both side surfaces aligned with the groove 3 and the upper corners of the upper surface are cut off diagonally, and as shown in Fig. 5, the hexagonal shape has a rectangular cross section. Furthermore, as shown in Fig. 6, both sides are curved.Next, the joint surfaces of the two metal strips 1 and 2 are generally polished by mechanical polishing such as wire brushing or nylon hub polishing. However, if the metal strips 1 and 2 are made of precious metals such as silver, mechanical polishing is uneconomical as much material is dissipated.

Therefore, in this case, the metal strips 1 and 2 are heated in a neutral atmosphere such as nitrogen gas or argon gas or in a reducing atmosphere such as hydrogen gas, carbon monoxide, or ammonia cracking gas to clean the joint surfaces. It is desirable to activate it together with the The heating temperature in the above atmosphere should be 300°C or higher to fully activate the metal strip.
, 2 is desirably as close to the melting point as possible without melting (... Also, after activating the metal strips 1 and 2 by heating, to avoid condensation of moisture in the air and contamination of the metal surface. It is preferable to maintain the temperature at about 5 to 100°C higher than room temperature without cooling it to room temperature. Roll strips 1 and 2.

In this case, the cross-sectional area S2 of the metal strip 2 is defined as the cross-sectional area S2 of the groove 3.
, VC is set to I~1, so that the metal strip 1 serving as the base metal wraps around the metal strip 2 serving as the clad metal during rolling, thereby firmly joining the two. Note that if the cross-sectional area S2 of the metal strip 2 is larger than ± with respect to the cross-sectional area SlVC of the groove portion 3, the metal strip 2 becomes the base metal.
If it is smaller than 1, the metal strip 1 serving as the base metal overlaps the metal strip 2 too much, and the bonding boundary line between the two becomes wavy (the misalignment is also inappropriate).
As shown in FIG. 7, the composite metal strip thus obtained is pressed so that both upper sides of the metal strip 2, which will become the clad metal, are wrapped with the metal strip 1, which will become the base metal (because both metal strips 1, 2 are strongly bonded and will not peel off.

Note that the shape of the groove 3 of the metal strip 1 serving as the base metal is not limited to one with a flat bottom as shown in Fig. 3, but also one with a stepped bottom as shown in Fig. 8. But that's fine.

Further, the metal strip 1 is not limited to one having one groove 3, but may have a plurality of grooves 3. Next, examples of the present invention will be described.

The metal strip 1 that becomes the base metal has a thickness of 2 m and a width of 100 mm.
rm, the groove part 3 is formed in the copper strip with a depth d1=1.0rm,
Cross-sectional area s1=4m! l, the rising angle θ of the side wall is 15 to 9
The metal strip 2 that becomes the clad metal is made with a shape as shown in FIG. 3 (but it has a shape as shown in FIG. After degreasing both metal strips 1 and 2, the nylon hubs were polished in a water shower, and further 70
The surface was activated by heating in a hydrogen gas atmosphere at 0°C, and then cooled to 50°C.

While fitting the metal strip 2 into the groove 3 of the metal strip 1 with
00J) and further rolled at a rolling rate of 500J.
After annealing at ℃, it was rolled for 3 passes at a rolling ratio of 50% to a thickness of 0.
．． 4- silver-copper inlay type composite metal strips (Haruka 1 to ▲5) were obtained. The boundary lines between the metal strips 1 and 2 of these composite metal strips were all straight. Further, the composite ratio T2/tl and the bonding degree by bending of this composite metal strip were investigated, and the results shown in Table 1 were obtained. For comparison with the method of the present invention, the cross-sectional area S2 of the metal strip 2 is larger than the specified range with respect to the cross-sectional area S of the groove: portion 3 of the metal strip 1 (Consideration 6,
Composite metal strips (Haruka 6 to Haruka 8) were obtained by joining both metal strips 1 and 2 in the same manner as in the above example using Haruka 7) and one smaller than the specified range (Haruka 8). The composite ratio T2/tl and bonding degree of the composite metal strip are investigated and the results are also listed in Table 1.The angle α is the angle between the slope formed between the upper corners of the other metal strip in Fig. 4. be.

As is clear from the above results, according to the present invention, a groove is formed in the metal strip that becomes the base metal, and the cross-sectional area of the metal strip that becomes the clad metal is made to be one of the cross-sectional areas of the groove. The metal strip that becomes the metal can wrap and press the metal strip that becomes the clad metal that fits into this groove to firmly join both metal strips, and when the composite ratio of the composite metal strip is increased. It is extremely suitable for

[Brief explanation of the drawing]

Figure 1 is a perspective view of a composite metal strip obtained by a conventional method;
Figure 2 shows a conventional manufacturing method for composite metal strips, with a sectional view of one metal strip overlaid on the other, and Figures 3 to 8.
The figures show the method of the present invention, FIG. 3 is a sectional view showing the state before fitting one metal strip to the other metal strip, and FIGS. 4 to 6 show the other metal strip with different husbands. FIG. 8 is a sectional view showing another embodiment of the composite metal strip, FIG. 8 is a perspective view of a composite metal strip obtained by the method of the present invention, and FIG. 1... Metal strip (base metal), 2... Metal strip (
clad metal), 3...groove.

Claims (1)

[Scope of Claims] 1. Forming one or more grooves in the joint surface of a metal strip serving as a base metal, and rolling these metal strips while fitting a metal strip different from the base metal into the grooves. When joining, the groove has a side wall with a rising angle of 15° to 90°, and the metal strip, which is different from the base metal, has a shape that substantially follows the bottom and both side surfaces of the groove, and the cross-sectional area of the groove is A method for manufacturing a composite metal strip, characterized in that the cross-sectional area is 1/2 to 9/10 of that of a metal strip. 2. A method for manufacturing a composite metal strip according to claim 1, wherein both metal strips to be composited are heated in a neutral or reducing atmosphere to activate their surfaces.