JPS5982182A - Production of composite metallic rod - Google Patents

Abstract

PURPOSE:To obtain a composite metallic rod in a satisfactorily joined state in in-lay type joining of a composite alloy by rolling, by specifying the relation between the hardness ratio of a dissimilar material to a base material and the sectional area ratio of the dissimilar material to the channel part of the base material. CONSTITUTION:If the hardness (Hv) ratio of a dissimilar material 2 to a base material is about 0.4-0.8 the sectional area S2 ratio of the material 2 to the sectional area S1 in the channel part of the base material is set at about 0.7- 1.1 and the rising angle alpha on the side wall of the part 3 is set at about 65- 80 deg., at which the materials are joined by rolling and a composite metallic rod is formed. If the sectional area ratio is about <=0.7, the joining at both ends is insufficient and if it is about >=1.1, a surface joined part 4 has a scab, resulting in defective joining, The combination of metals at which the hardness ratio is about 0.4-0.8 is, for example, phosphor bronze for the base material and silver, silver solder, etc. for the dissimilar material.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a so-called inlay type composite metal strip of one or more strips in which one metal strip serving as a base metal is rolled and bonded so as to embed the other metal strip on the surface of the other metal strip.

Conventionally, in order to manufacture a composite metal strip, a method has been used in which a different metal cladding with a cross-sectional area somewhat smaller than the groove is embedded in a groove formed in the joint surface of a metal strip serving as a base metal. In addition, recently, a groove formed on the joint surface of a metal strip serving as a base metal has a cross-sectional area of 1.1 to 1.5.
A method has been proposed in which dissimilar metal strips having a total cross section of 4 jt are rolled while being fitted together (Japanese Patent Publication No. 56-21516
Publication No.).

As a result of further studies on the production of such composite metal strips, the inventors of the present invention have found that there is a region in which the bondability is even better than that achieved by the conventional methods as described above, and the present invention has been achieved.

Therefore, an object of the present invention is to provide a new single strip or a metal strip that can more completely join the groove side wall of the base metal after rolling and pressure welding to the other cladding metal strip, compared to the above-mentioned 7 prior art techniques. An object of the present invention is to provide a method for manufacturing a multi-strip inlay type composite metal strip.

That is, in the present invention, when manufacturing a composite metal strip from a metal strip serving as a base metal and a metal strip that is different from the metal strip and has a hardness ratio of 0.4 to 0.8, The joint surface of the metal strip has a shape of 1j'2 +, and one or more grooves have a cross-sectional area of 0.7 to 1.
A method for manufacturing a composite metal strip, which comprises rolling and joining the dissimilar metal strips, which have a cross-sectional area twice as large and have a shape that can be fitted into the groove, while fitting these metal strips together. .

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a cross-sectional view showing an example of the state before fitting one of the different metal strips to be clad to the metal strip to become the base metal according to the present invention, and FIG. The deformation resistance ratio (hardness +-+V) of the dissimilar metal strip 2 to be cradled thereto is between 0.4 and 0.8, for example, as in the case of phosphor bronze and silver or silver solder. In the combination of ranges, when the dissimilar metal strip 2 to be clad is rolled and joined to the groove 3 provided in the metal strip 1 serving as the base metal by ω, according to the present invention, the cross-sectional area S1 of the groove 3 is For =, the cross-sectional view 82 of the metal strip 2 is 0.7
By fitting the metal strips 2 in such a shape that the metal strips are 1.1 times larger and rolling them together 4, the boundary m4 between the base metal 1 and the clad metal 2 forms a straight line, as shown in FIG. It is possible to obtain a highly reliable inlay-type composite metal strip in which both metals are firmly bonded to each other with a stable dimension of 4'R degree and a predetermined width.

In the present invention, when manufacturing a composite metal strip, grooves are formed at the joint portion of the metal strip 1 serving as the base metal by grooving as shown in FIG.

In this case, it is preferable that the rising angle α of the side wall of the groove portion 3 is in the range of 65 to 90 degrees, and in particular, 65 to 80 degrees allows for easy processing on the groove.

In the 1st case mentioned above, the cross-sectional area S2 of the metal strip 2 to be clad is set to <-1.1 times or more than the cross-sectional area S1 of the groove 3 of the smetal 1.
2, the gold Ig strip 2 cladding will partially protrude from the groove 3 during rolling and joining, and the boundary line 5 between the base metal 1 and the clad metal will not be straight but meandering, as shown in FIG. 5, which is not desirable as a product.

On the other hand, if the cross-sectional area S2 of the metal strip to be clad is smaller than 0.7 times the cross-sectional area S1 of the groove,
'7# Part 3-\'s Clara 1? Filling of metal strip 2:
The JIi degree becomes smaller, and as a result, the gold 1. The relative slip star between the metal strip 1 and the metal strip 2 that crats becomes smaller, and the bonding at the sidewalls of the groove 3 becomes insufficient.1 Figure 4 is a graph showing the ratio of both cross-sectional areas and the bonding state at the sidewalls of the groove. The horizontal axis is the ratio 82/SI of the cross-sectional area S2 of the metal strip to be clad to the groove cross-sectional area S1 of the metal strip serving as the base metal, and the vertical axis is the arc length that joins the groove and the arc that is completely joined. Ratio to length (percentage)
The results are plotted using various area ratios. From this result, it can be seen that a perfect bond (100-e-cent) can be obtained if 82/SH is 0.7 or more, and considering the above results, the hardness ratio of both metals is 0.4~ When using metal strips in the range of 0.8, S2/S
1 is in the range of 0.7 to 1.1, it can be seen that a good bond without meandering can be obtained. Note that there is no particular limitation on the cross-sectional shape of the cladding metal strip 2 used in the present invention. In addition to those with curved sides as shown in Figure 1, for example, as shown in Figure 5, there are those with a rectangular cross-section (a), circular ones (I)), and those with an oval shape with the top and bottom surfaces cut off. Things (C)
, or a rectangular top-faced clay figurine (d) cut off diagonally.

According to the present invention, the cross-sectional area of the cladding metal strip is 4
- The cross-sectional area of the groove of the metal strip is 0.7 to 1.
Since the area is relatively small (1 times), the cladding metal can be easily fitted into the groove of the base metal, and by rolling, a strong joint can be obtained with a direct boundary line, making it possible to Rate ↓〈Good inlay-type pustular metal strips can be obtained.

Example: As a base metal metal strip, the thickness is 2.0+mm and the width is 50mm.
Using a completely annealed phosphor bronze strip with a hardness of mm HV120, depth 0.14+n+n, cross-sectional area S, === 0.3
A groove with a width of 29 mm2 and an angle of 70 degrees was provided on the side wall. On the other hand, the metal strip to be clad has a cross-sectional shape as shown in FIG. 1, and its cross-sectional area S2 is the groove cross-sectional area 8. The hardness I (v:=4
A silver solder strip with a hardness of 8 and a silver solder strip with a hardness of 1 (v-96) were used.

Next, attach the metal strip of the base metal (phosphor bronze) to the other metal strip (
Fitted with silver or silver solder) and cold rolled and welded in one ξ step, then subjected to 1 width tit Silver/red bronze and silver wax/phosphor bronze inlay type composite metal strips were obtained, respectively.

In this case, in each composite metal strip, the boundary line between both metals was straight, and the contact arc length between the groove and the cladding metal strip was perfectly connected.

In addition, the cross-sectional area S1 of the metal strip to be clad and the cross-sectional area S of the groove portion
When the ratio S 2 / S 1 of 2 is larger than 1.1 and smaller than 0.7, composite metal strips were manufactured using the same monthly combinations and manufacturing conditions as above, and the degree of bonding was investigated. The above S2/S1 is 0.7
It is shown in FIG. 4 along with cases in the range of ~1.1.

As is clear from this result, when the cross-sectional area of the metal strip to be clad is smaller than 0.68 times the groove 1 width, slight joint defects occur in some parts, and when it approaches 0.60 times, the groove part The side walls become poorly bonded.

If S2/S exceeds 1.1 times, the metal strips (silver strips and silver brazing strips) will be Clara P.
As shown in the figure, the boundary line between the two became meandering or wavy at the end of the camellia, which was inappropriate.

[Brief explanation of the drawing]

ill￥1 is a cross-sectional view showing an example of the state before combining 10 metal strips to be clad with a metal strip that becomes 4-smetal by the present investigation method. FIG. 3 is a perspective view showing an example of a metal strip, FIG. 3 is a perspective view showing a composite metal strip obtained by a conventional method, and FIG. 4 is a cross-sectional area S2 of the metal strip to be cladding and a groove section of the metal strip to be the base metal. FIG. 5 is a graph showing the ratio S 2/S of the area S and the bonding state at the side wall of the groove, and is a sectional view showing various examples of shapes of the metal strip used in the present invention.・Metal strip to be base metal, 2. Metal strip to be clad, 3. Groove, 4. Bonding boundary line of composite metal strip according to the present invention, 5. Composite gold by conventional method as well. ・Bonding boundary line of 4 strips, Sl.・Cross-sectional area of the groove, s2 ・Cross-sectional area of the cladding metal.

Claims (1)

[Claims] (1) When manufacturing a composite metal strip from a metal strip that is a base metal and a metal strip that is different in texture from the metal strip and has a hardness ratio of 0.4 to 0.8, the base metal and In one or more grooves formed on the joint surface of the metal strip,
While fitting the dissimilar metal strip having a cross-sectional area of 0.7 to ~i, i times the cross-sectional area of the groove and having a shape capable of fitting into the groove, these metal strips are rolled and joined. A method for manufacturing a composite metal strip, characterized by: