JPH01249279A - Manufacture of clad material - Google Patents

Abstract

PURPOSE:To improve the production yield and to manufacture clad material with high quality by carrying out rolling by using covering material having width larger than that of base metal and subsequently, removing the surplus width parts by using shearing force generated along the base material edges. CONSTITUTION:The width of the covering material 2 is taken larger than that of the base metal 1 and the surplus width parts 2a of the covering material 2 are projected from both edges of the base metal 1 to carry out rolling. At this time, cracks along the edges of the base metal 1 are caused on the covering material 2 by the shearing force generated by the difference in extension in the rolling direction between the rolling part of the covering material 2 to the base metal 1 and the surplus width parts 2a to remove the surplus parts 2a. By this method, the production yield is improved and the clad material with high quality can be manufactured.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a cladding material by rolling, and particularly to an improvement in a method for manufacturing an overlay cladding material.

[Prior art and problems] There are two types of cladding materials: inlaid cladding materials where the width of the sheathing material is smaller than the width of the base material, and overlay cladding materials where the width of the sheathing material and the width of the base material are approximately equal. As is known, the present invention relates to a method of manufacturing the above-mentioned overlay cladding material.

In order to manufacture so-called overlay cladding material, the base material and the covering material of the same size are rolled and welded together, or the width of the covering material is narrowed by 1 to 2 culm degrees and rolled welded, and then both end portions are It is common to remove the ears by making a slit.

However, as mentioned above, if the r11 dimensions of the base material and the cladding material are the same or close to this, cracks may occur at the edge of the cladding material due to a slight deviation in the bonding position between the base material and the cladding material. In rare cases, this may cause the material to break, which often impedes stable manufacturing operations.

Furthermore, quality defects that occur at the ends of the cladding material must be removed by side trimming, and the removed portions are scrapped, which is a major cause of deterioration in the yield of materials in the middle direction. Become.

[Objective of the Invention J The present invention has been made in view of the above-mentioned circumstances, and not only can stable pressure welding be always expected without the occurrence of edge cracks during rolling pressure welding, but also The present invention aims to provide a method for producing an overlay clad material that eliminates the need for edge removal due to slitting operations and greatly improves product yield.

[Summary of the invention] The present invention provides a method for rolling the cladding material by changing the width of the cladding material to the base H.
The width of the sheathing material is larger than that of the base material, and the extra width portion of the sheathing material is rolled so as to protrude from both edges of the base material. generating a shearing force due to the difference in elongation in the rolling direction between 11 of base material and coating material without slitting operation.
This results in an overlay cladding material of equal .

[Example 1 The present invention will be described below with reference to the drawings.

FIG. 1 is an explanatory sketch showing how the crab material 3 is manufactured by the manufacturing method according to the present invention.

In the figure, 1 is a base material and 2 is a covering material, and various materials are selected depending on the purpose. However, in the present invention, the widths of the materials to be rolled and welded are not equal, and the width of the covering material 2 is selected to be larger than the width of the base material 1, so that the width of the covering material 2 is larger than the width of the base material 1. Rolling and pressure welding is performed with the rolls 10 and 10- with the r1 portions 2a and 2a protruding.

When rolling welding is performed with the metal mesh 1 parts 2a, 2a formed as described above, the pressure welding part of the covering material 2 with the base material 1 and the remaining part [1]
) A large difference in elongation due to plastic deformation occurs between the part 2a and the part 2a, which generates a shear force at the interface and causes a crack.

FIG. 2 is an explanatory diagram showing the above mechanism, and when roll pressure welding is performed, the coating material 2 has edges 1a and la of the base material 1.
A large difference in plastic deformation occurs as a boundary, and this difference generates a shear force, which causes cracks to occur at the shear interfaces 2b, 2b along the edges 1a, la of the base material 1. From this folded part, the remaining riJ part 2a.

2a, and the removed extra width portions 2a, 2a are continuously wound up by the winders aiii and ii as shown in FIG. Material 3 can be obtained continuously.

According to the manufacturing method according to the present invention, the covering material 2 has an extra width portion 2a.
, 2a exists, and this extra width effectively prevents the occurrence of edge cracks, etc., and eliminates the occurrence of edge defects of the cladding material after pressure welding. It has the great feature of eliminating the need for slitting work and allowing pressure welding work to be performed in a stable state at all times.

Note that the remaining rlJ portion that has been sheared and removed becomes scrap, but since this scrap is not in the form of composite material 1 like in the past, it can be remelted and reused, which is an economic disadvantage. can be kept to a minimum.

Example 1 A stainless steel strip of I'tJ28 inch and a thickness of 0.25 mm was used as the base material, and a stainless steel strip of I'tJ28 inch and a thickness of 0.25 mm was used as a covering material.
Made of 65mm aluminum strip, medium 28mm, thickness 0.2
A 5 mm cladding material for a case material was manufactured.

After cleaning and brushing the pressed surfaces of the materials, the materials were rolled and welded at a rolling rate of 21%, and the remaining rjj portions of the aluminum strip were separated neatly, yielding a rad material with a good end appearance. As a result of diffusion heat treatment of this material at 550°C x 11in, it was possible to obtain a cladding material for a case material with uniform workability and no need for end slits.

Example 2 A copper strip with an IJ of 19.3 m and a thickness of 0.47 nIm was used as the base material, and a solder strip with a width of 25 mm and a thickness of 0.4++ m was used as the covering material. We manufactured cladding materials for electrical contact materials.

As a result of cleaning and brushing the rolled surface and rolling and welding at a rolling ratio of 50.6%, the margins of the solder strips were separated neatly, and a rad material with a good appearance without the need for end slits could be obtained.

[Effects of the Invention] As described above, according to the manufacturing method of the present invention, it is possible to omit the slitting operation for side trimming that was conventionally necessary after rolling and welding, contributing to improved productivity and reducing the amount of scrap generated. Not only can the amount of carbon dioxide be kept small, but it can also be reused easily, which can improve yields.
Furthermore, the occurrence of quality defects near the edges due to misalignment of the adhesion position of the covering material is eliminated, and stable rolling welding can always be ensured, so its industrial benefits are truly great.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing how a clad material is manufactured by the method according to the present invention, and FIG. 2 is an explanatory diagram showing the generation of shear force generated in the material during roll pressure welding. ■=Base material, 2: Covering material, 2a: Extra width portion, 3: Clad material, 10.10-: Roll, 11: Winding machine. Agent Patent Attorney Fujio Sato

Claims (1)

[Claims] (1) The width of the coating material is made larger than the width of the base material, the extra width is rolled to protrude laterally, and the shearing force generated along the edge of the base material during rolling is used to create the coating material. A method for producing a cladding material, comprising shearing the extra width portion of the cladding material, and separating and removing the sheared extra width portion from the cladding material.