JPH0441084A - Production of metallic laminated bar - Google Patents

Abstract

PURPOSE:To efficiently produce the metallic laminated bar by pressing and pressure welding 1st and 2nd metallic bars of specific sizes by using a grooved roll having a specific sectional shape. CONSTITUTION:The 1st metallic bar 30 and the 2nd metallic bar 32 which has the width narrower than the width of this 1st metallic bar and nearly equal to the base width of the groove part 11 thereof and has the thickness of 1.5 to 2.5 times the depth of the groove part are pressed by using the grooved roll 12 having the groove part which is provided continuously in the circumferential direction and has a nearly trapezoidal section of the side face and base forming a prescribed angle within a 110 to 155 deg. range. The 2nd metallic bar 32 is pressed by the base of the groove part 11, by which the two metallic bars are pressure welded. The top lay type metallic laminated bar having the good joint state at the edge is stably and efficeintly produced in this way.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method for manufacturing a metal composite strip.

[Prior Art] Metal composite strips made by joining metals with different properties, such as combinations of silver and copper, iron and copper, etc., exhibit excellent electrical properties that cannot be obtained with alloys, so they are suitable for electronic Widely used as a material for parts and electrical components.

As shown in Fig. 3, such metal composite strips are
A so-called overlay type metal composite strip formed by joining a second metal strip 32 to the entire surface of the first metal strip 3o;
As shown in FIG.
A top lay type metal composite strip formed by forming the metal strip 42 so as to have an island shape in cross section is mentioned.

The overlay type metal composite strip is produced by roughening and cleaning the bonding surfaces of the first metal strip 30 and the second metal strip 32, and pressing them from above and below using a pair of upper and lower flat rolls so that the bonding surfaces are aligned. Accordingly, the first metal strip 30 and the second metal strip 32 are pressed together and rolled at the same time.

On the other hand, in the top lay type metal composite strip, the first metal strip 4
0 and the second metal strip 42 are roughened and cleaned, and a flat roll is placed on the first metal strip 40 side and a flat roll is placed on the second metal strip 42 side.
The second metal strip 42 is manufactured by simultaneously rolling and press-welding the two using a grooved roll having a groove with a rectangular cross section so that the joint surfaces are aligned and pressed from above and below. be done.

[Problems to be Solved by the Invention] However, the top lay type metal composite strip has a drawback in that the bonding condition at the edge portion is poor. For this reason, there is a risk of peeling in subsequent steps, so it is hardly used industrially.

The present invention has been made in view of these points, and it is an object of the present invention to provide a method for manufacturing a metal composite strip that can stably and efficiently obtain a top-lay type metal composite strip with good bonding conditions at the edge portions. purpose.

[Means for Solving the Problems] The present invention is provided continuously in the circumferential direction, the side surface and the bottom surface form a predetermined angle within the range of 110° to 155', and the cross section is approximately trapezoidal. Using a grooved roll with grooves,
a first metal strip, the width of which is narrower than the first metal strip, and
A second metal strip having approximately the same width as the bottom surface of the groove and a thickness of 1.5 to 2.5 times the depth of the groove is connected to the second metal strip on the bottom surface of the groove. Provided is a method for manufacturing a metal composite strip, characterized in that the first metal strip and the second metal strip are brought into pressure contact by rolling in a pressing manner.

In order to finish the metal composite strip obtained by the method of the present invention into a final product, the metal composite strip is provided continuously in the circumferential direction after annealing treatment as necessary, and the angle between the side surface and the bottom surface is 9.
0'' to less than the predetermined angle, and is preferably further rolled using a grooved roll having a groove portion having a substantially trapezoidal cross section.

In the present invention, the angle between the side surface of the groove portion of the grooved roll and the bottom surface is set to 110' to 155'.

This means that if the angle is less than 110', the second
Because the first metal strip and the second metal strip are not securely pressed against each other and the joint condition at the edge portion is poor, the grooved roll This is because if the angle exceeds 155°, the bonding condition at the edge portion will deteriorate, making it difficult to finish the shape of the final product. It is particularly preferable that the angle between the side surface and the bottom surface of the groove of the grooved roll is 130' to 155°.

The width of the second metal strip is preferably the same as or slightly narrower than the width of the bottom surface of the grooved roll so that it can be easily positioned and pressed against the grooved roll.

The thickness of the second metal strip is set to 1.5 to 2.5 times the depth of the groove. This is because if the thickness of the second metal strip is less than 1.5 times the depth of the groove, the bonding condition between the first metal strip and the second metal strip will be poor, and the thickness of the second metal strip will be less than 1.5 times the depth of the groove. This is because if the depth is 2.5 times the depth of the groove, the part of the second metal strip extending from the groove becomes large and the shape of the resulting composite strip is deformed.

In order to finish the obtained metal composite strip into a final product, we further determined that the angle between the side surface and the bottom surface was between 90° and the angle formed by the grooved roll used in the roll welding described above (the angle actually used in the roll welding). It is rolled using a grooved roll having a groove whose cross section is approximately trapezoidal (an angle smaller than the specific angle of the groove of the grooved roll) and whose cross section is substantially trapezoidal. For example, if the specific angle of the groove of the grooved roll used for rolling welding is 130', the angle of the groove of the grooved roll used for finishing is 90° to 130°.
The angle will be less than In this case, the final product may be finished by rolling once, or the final product may be finished by rolling multiple times. When finishing by rolling multiple times, the angle between the side surface and the bottom of the grooved roll used in each rolling step should be set so that it gradually approaches 90° as the number of rolling steps increases. A top-lay type metal composite strip with a rectangular cross section as shown in FIG. 5 is obtained.

Note that the metal of the first metal strip and the metal of the second metal strip may be different or the same. Alternatively, both the upper and lower rolls may be grooved rolls, and the second metal strip may be pressed against both surfaces of the first metal strip. Rolling can be performed under conventional conditions.

[Function] According to the method for manufacturing a metal composite strip of the present invention, the metal composite strip is provided continuously in the circumferential direction, and the angle between the side surface and the bottom surface is 110° to 1.
Using a grooved roll having a groove with an angle of 55° and a rectangular cross section, the first metal strip is formed with a thickness of 1.5 degrees the depth of the groove.
The metal strip is pressed and rolled while being rolled.

When the second metal strip is pressed by the bottom surface of the groove of the grooved roll, internal stress is generated near the bonding interface with the first metal strip. Accumulation of internal stress causes plastic deformation. Therefore, when viewed microscopically, the bonding interface between the first metal strip and the second metal strip expands not only in the length direction but also in the width direction. The grooves of the grooved roll used in the present invention sufficiently allow this widthwise expansion. Further, since the depth of the groove is defined in accordance with the thickness of the second metal strip, the second metal strip is sufficiently deformed during pressure welding, and sufficient bonding strength can be obtained. Further, deformation at the interface caused by restraining the side surface of the groove or the side surface of the second metal strip is prevented. As a result, the bonding strength at the edge portion of the second metal strip is improved.

[Example] Hereinafter, an example of the present invention will be specifically described with reference to the drawings.

Example 1 First, a wire brush was used to perform a cleaning treatment on the bonding surfaces of a copper strip having an ID111 width of 80 mm and a steel strip having a thickness of 1 mm and a width of 40 mm. Next, as shown in FIG. 1, a grooved roll 12 having grooves 11 having a substantially trapezoidal cross section continuously in the circumferential direction on the steel strip 10 side and a flat roll 14 on the copper strip 13 side are used to create grooves. The steel strip 10 is held in the groove 11 of the attached roll 12,
By pressing the copper strip 13 with the flat roll 14, the copper strip 13
and the steel strip 10 were pressure-welded while rolling their joint surfaces together. At this time, the width of the bottom surface of the grooved roll 12 is 40 mm.
mm, a depth (d) of 0.5+am, and an angle θ between the side surface and the bottom surface of 155°. Further, rolling was performed under known conditions that are commonly used. In this way, the metal composite strip of Example 1 was manufactured.

The bonding condition at the edges of the obtained metal composite strip was investigated. The results are expressed as the angle θ between the side surface and the bottom surface, the depth of the groove 11 (d), the thickness of the steel strip 0 (1), and the ratio of the thickness of the steel strip 10 to the depth of the groove 11 (1/d). They are also shown in Table 1 below. The bonded state of the edge portions was determined by subjecting the metal composite strip to a bending test and visually determining whether there was any peeling at the edge portions.

At this time, the case where there was no peeling and the bonding condition was good was indicated as 0 (especially good, ⊚), and the case where peeling occurred and the bonding condition was poor was indicated as x.

Examples 2 to 7 The copper strip used in Example 1 and the steel strip having the thickness shown in Table 1 below were subjected to cleaning treatment using a wire brush. Next, the angle θ between the side surface and the bottom surface shown in Table 1 below.
Each of the metal composite strips of Examples 2 to 7 was produced by pressing and rolling in the same manner as in Example 1 using a grooved roll having a grooved roll.

The bonding condition at the edge portion of each of the obtained metal composite strips was examined in the same manner as in Example 1. The results are also listed in Table 1 below.

Comparative Example 1 A wire brush was used to clean the joint surfaces of the 1 ml thick, 80 mm wide copper strip and the 1 ml thick, 40 mm wide steel strip used in Example 1. Next, using a grooved roll having grooves with a rectangular cross section continuous in the circumferential direction on the steel strip side and a flat roll on the copper strip side, The copper strip and the steel strip were pressed together with their joining surfaces together and rolled while being pressed together. At this time, the grooved roll has a bottom width of 40 mrss depth (d).
was 0.51, and the groove formed by the side surface and the bottom surface was 90'' (rectangular).In this way,
A metal composite strip of Comparative Example 1 was manufactured.

The bonding condition at the edge portion of the obtained metal composite strip was examined in the same manner as in Example 1. The results are also listed in Table 1 below.

Comparative Examples 2 to 6 The copper strip used in Example 1 and the steel strip having the thickness shown in Table 1 below were subjected to cleaning treatment using a wire brush. Next, the angle θ between the side surface and the bottom surface shown in Table 1 below.
Metal composite strips of Comparative Examples 2 to 6 were manufactured by rolling and pressing in the same manner as in Example 1 using a grooved roll having a grooved roll.

The bonding condition at the edge portion of each of the obtained metal composite strips was examined in the same manner as in Example 1. The results are also listed in Table 1 below.

Table 1 As is clear from Table 1, the metal composite strips (Examples 1 to 7) obtained by the method of the present invention did not cause peeling at the interface in the bending test, and the bonded state at the edge portion was It was good. On the other hand, the metal composite strips obtained by the conventional method (Comparative Example 1) and the metal composite strips obtained under conditions outside the scope of the present invention (Comparative Examples 2 to 6) showed no improvement at the interface in the bending test. Peeling occurred and the bonding condition at the edge portion was poor.

Next, the metal composite strip of Example 4 is further subjected to rolling treatment.

First, the metal composite strip of Example 4 was heated to 700 ml in a non-oxidizing atmosphere.
Heat treatment is performed at ℃ for 30 seconds. Next, as shown in FIG. 2, the angle between the side surface and the bottom surface on the steel strip 10 side is 110'', the cross section is approximately trapezoidal, the width of the bottom surface is 40.5 m+s, and the groove depth is 0.4 mm. The heat-treated metal composite strip 23 was rolled using a grooved roll 21 having a certain groove 20 continuously in the circumferential direction and a flat roll 22 on the copper strip 13 side.The rolled metal composite strip 23 is a steel strip. The thickness of the copper strip 10 was 0.4 mm, and the thickness of the copper strip 13 was 0.4 mm.Then, the angle between the side surface and the bottom surface was 90' (the cross section was rectangular), and the bottom surface was placed on the steel strip 10 side. The metal composite strip 23 was further rolled using a grooved roll having a groove portion having a width of 411111 mm and a groove depth of 0.3 mm continuously in the circumferential direction, and a flat roll on the copper strip 13 side.After rolling. In the metal composite strip 53, the thickness of the steel strip 50 was 0.3 mm, and the thickness of the copper strip 52 was 0.3 mm.In this way,
The steel strip 52 was finished into a metal composite strip having a rectangular cross section as shown in FIG.

The bonded state of the obtained metal composite strip was examined in the same manner as in Example 1 and was found to be extremely good. Furthermore, when this metal composite strip was used as an electrical component material, it could be used without any problems.

[Effects of the Invention] As explained above, the method for manufacturing a metal composite strip of the present invention includes the following steps:
It is possible to stably and efficiently obtain a top-lay type metal composite strip with good bonding conditions at the edge portions.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing a grooved roll and a flat roll used in the method according to the present invention, and Fig. 2 shows a grooved roll and a flat roll used when further rolling a metal composite strip. 3 is a sectional view showing an overlay type metal composite strip, and FIGS. 4 and 5 are sectional views showing a toplay type metal composite strip. 10... Steel strip, 11.20... Groove, 12.21.
...Grooved roll, 13...Copper strip, 14.22...Flat roll, 23.53...Metal composite strip, 30,40.5
0...first metal strip, 32,42.52...second metal strip.

Claims (2)

[Claims] (1) Continuously provided in the circumferential direction, with a side surface and a bottom surface of one
Using a grooved roll having a groove that forms a predetermined angle within the range of 10° to 155° and has a substantially trapezoidal cross section, the first
a metal strip having a width narrower than the first metal strip, approximately the same width as the bottom surface of the groove, and a thickness of 1.5 to 2.5 times the depth of the groove. A metal composite characterized in that the first metal strip and the second metal strip are pressed together by rolling the second metal strip in a manner that presses the second metal strip with the bottom surface of the groove. Method of manufacturing strips. (2) Using a grooved roll having grooves that are continuously provided in the circumferential direction, the angle between the side surface and the bottom surface is from 90 degrees to less than the predetermined angle, and the cross section is approximately trapezoidal, The method for manufacturing a metal composite strip according to claim 1, further comprising rolling the metal composite strip.