JPS58179583A - Production of clad material - Google Patents

Abstract

PURPOSE:To improve yield by fitting a covering tubular material onto a base material, grasping both materials flatly so as to bring the same in tight contact with each other without any clearance and sealing both ends then subjecting the materials to diffusion welding thereby preventing the inflow of air and performing diffusion welding in an ordinary heating furnace. CONSTITUTION:A stainless steel pipe 21 is fitted as a covering tubular material on a round barlike copper base material 20, and both are grasped under pressure with press dies 22, 23 whereby the base material and the covering material are plastically deformed to a flat shape. Such end plates 25 which prevent the inflow of air are welded to both ends of the cladding blank metal 24 formed flatly in tight and close contact with each other to seal both ends. The blank material is put into a heating furnace 26 for the purpose of joining, and a required weight 27 for applying the face pressure necessary for joining is placed thereon during heat, whereby the copper base material 20 and the stainless steel pipe 21 are diffusion-welded. The diffusion welding is accomplished in the same way as mentioned above by deforming both materials plastically to a flat shape with a pair of rolls having the calibers of a flat section, and sealing both ends then heating the materials and rolling the same again.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for manufacturing a flat laminated material in which a covering material made of a material different from that of the base material is joined around the base material.
This method is particularly suitable for application to the production of corrosion-resistant conductive rods.

Electrodes used in industrial plating, salt electrolysis, etc. are required to have not only electrical conductivity but also excellent corrosion resistance with little corrosion due to electrolyte even after long-term use. Finally, a conductive rod material with a flat cross section is used, in which a conductive material such as copper is coated with a corrosion-resistant material such as titanium or stainless steel, and one end of the conductive material is closed with a corrosion-resistant material. In this conductive bar, since electricity is applied to the inner conductive material, it is desirable that the resistance to the surface of the covering material be small, and it is desirable not only to simply bring the two metals into contact, but also to perform diffusion bonding.

Therefore, conventionally, vacuum diffusion welding and hot rolling diffusion welding have been adopted as methods for manufacturing conductive bars.

The former manufacturing method using the vacuum diffusion welding method involves fitting a stainless steel pipe 2 with a larger diameter into a round bar-shaped copper base material 1, and then facing each other. The material is pressed between a pair of press metals 113゜4 to deform it into a flat KlI shape, and the resulting nine-jointed material is placed in the sealed chamber 5 of the vacuum diffusion welding device.
The steel base material 1, the stainless steel pipe 2, and the t- Join. Thereafter, a conductive bar was produced by welding an end plate 9 to one end to prevent infiltration of electrolyte and the like.

This method achieves extremely high quality #1! However, the disadvantage is that large-scale vacuum diffusion welding equipment is required due to the electric cost.

On the other hand, in the latter island pressure fly diffusion #* method, as shown in Fig. 2, the process m' is shown by fitting a stainless steel pipe 2 with a larger diameter into a round bar-shaped copper base material 1. The material is heated in a heating f10 while preventing oxidation, and then brought to an appropriate temperature and woven using a Natsu9 and Zeta roller, and then sent between a pair of opposing rolls 11° and 12 having flat cross-section calibers to be plastically deformed by rolling. - Join the steel base material l and the stainless steel pipe 2. Thereafter, the end plate 9 is welded to form a conductive bar in the same manner as in the case described above.

In this method, oxidation cannot be prevented during forming because the material is removed from the heating furnace 10 and hot rolled, and air enters the unrolled portion from the open end, causing oxidation and resulting in non-bonded portions. In particular, if the time from removal from the heating furnace IO to rolling is long, the proportion of non-bonded portions will increase (4) and the yield will deteriorate.

It is an object of the present invention to provide a method for producing a kettle material that eliminates the above-mentioned conventional drawbacks, does not require large-scale equipment, and can produce high-quality products. The structure of the present invention to achieve such an object is to fit a cladding tube material having a diameter larger than that of the base material into a base material, and to compress and deform the cladding tube material into a flattened material so that the outer circumferential surface of the base material and the cladding tube material are The base material and the cladding tube material are bonded to each other in close contact with each other, after which both ends are sealed to prevent air from entering, and diffusion welding is performed to join the base material and the cladding material.

Hereinafter, PlaK will be explained about Kuji Tsumugi by applying the method of manufacturing a laminated material according to the present invention to a conductive bar material.

Fig. 3 is a process diagram for example K when press forming is used. First, a stainless steel pipe 21t of a larger diameter than this is coated on a steel base material 20 in the shape of a round bar as a covering pipe material. A pair of press metals 1122.23 facing each other are used to clamp and plastically deform the steel base metal 20 into a flat shape. do. Next, air is applied to both ends of the laminated material 24, which is thus written without any gaps and formed into a flat shape.
The end plates 25 are each welded and sealed to prevent inflow. Thereafter, the steel base material 20 and the stainless steel pipe 21 are placed in a heating furnace 26 for bonding, and heated with a required weight 27 placed thereon to apply surface pressure necessary for bonding, thereby diffusion welding the steel base material 20 and the stainless steel pipe 21. Conventionally, in this diffusion 11II bonding, it was necessary to use a vacuum atmosphere or a non-oxidizing atmosphere to prevent oxidation of the bonding surface, but the copper base material 20 and the stainless steel copper tube 21 were bonded without any gaps. Since both ends are sealed and welded, air is prevented from entering the joint surface, and oxidation does not proceed, allowing diffusion #I contact in the atmosphere. In this way, once the conductive bar material 28 is obtained as a laminate material that has been completely diffusion welded, it can be cut as necessary to produce a one-side sealed material, a two-piece material, a laminate material with both ends open, etc. A corrosion-resistant conductive rod is obtained.

Fig. 4 is a process diagram showing a complete example of roll forming, in which a stainless steel pipe 21 of a larger diameter is fitted as a round bar-shaped steel base material of 2°K as a cladding pipe material, and these are flattened. A flat Kll is sent between a pair of opposing rolls 29.
While deforming the steel base material 2o and the stainless steel pipe 21
Make sure they are in close contact with each other without any gaps. In this way, the plugs 31 are inserted into both ends of the nine-joint material 24, which is tightly fitted without any gaps and formed into a flat shape, to prevent air from flowing in, and are sealed by welding.

After this, put it in the heating furnace and heat it.
9. Diffusion welding is performed by sending and rolling for 30 minutes. In this case, in the first nine roll rolling to bring the copper base material 2o and the stainless steel pipe 21 into close contact with each other without any gaps,
The remainder of the flattening of the 2nd im roll is left as follows. In this way, the copper base material 2o and the stainless steel pipe 21 are brought into close contact with each other without a gap, and both ends are seal-welded, which prevents air from entering the joint surface and prevents oxidation from proceeding. In this way, diffusion welding can be carried out in the atmosphere.Once the conductive bar material 28 has been completely diffusion welded and serves as a good joining material, it can be cut as necessary as in the case described above. Good.

In each of the above embodiments, the end plates or plugs are welded after being brought into close contact with each other without any gaps, but any method may be used, and even when roll forming, the required pressure is applied in a heating furnace. Alternatively, in the case of press forming, diffusion welding may be performed by heating in a heating furnace and then performing diffusion welding by roll forming. Further, the base material is not limited to a round bar, but a hollow bar or the like can be used.

Moreover, it can be applied to the production of laminated materials using various metal materials.

As explained above in detail with the embodiments, according to the method of the present invention, when the base material and the cladding material are plastically deformed into flat shapes, the art material is brought into close contact with the joint surface, minimizing air remaining on the joint surface, and both Since it is sealed, air is prevented from entering during the bonding process, and oxidation of the bonding surface does not progress, so good diffusion bonding is possible even in the atmosphere. In addition, since this type of laminated material is often used with one end sealed, sealing both ends before joining requires only a complete change in the order of the steps and does not increase the number of steps. Therefore, diffusion welding can be easily performed using a general heating furnace without requiring expensive equipment, and a bonded material with a high yield and excellent quality can be manufactured.

[Brief explanation of the drawing]

FIG. 81 and FIG. 2 are process diagrams of a conventional method for manufacturing a laminated material. FIG. 1 shows a vacuum diffusion S welding method using press forming, and FIG. 2 shows a hot rolling diffusion welding method using roll forming. j
Figures I3 and IIIL4 are process diagrams showing a practical theory f4K of the method for manufacturing the laminated material of the present invention, in which the third rail shows the case of press molding, and the one of Figure 1114 shows the case of roll molding. In the drawing, 20 is a copper base material, 21 is a stainless steel pipe, 22.23 is a press metal lid, 24 is a mating material, 25 is an end plate, 26 is a heating furnace, 27 is a weight, 28 is a conductive bar material, 29 .30 is a roll, 31 is a plug. Patent Applicant Mitsubishi Heavy Industries, Ltd. Sub-Attorney Attorney Shibe Mitsuishi (and 1 other person) Figure 1 0 Figure 2 Figure 4

Claims (1)

[Claims] A cladding tube material having a diameter larger than that of the base material is fitted onto the base material, and these are compressed and plastically deformed into flat shapes so that the outer circumferential surface of the base material and the inner circumferential surface of the cladding tube material are brought into close contact with each other. A method for producing a laminated material, characterized in that the base material and the cladding material are joined by sealing the base material to prevent air from entering, and further by diffusion welding.