Dissimilar metal tubing and preparation method and application thereof

Abstract

The invention relates to a dissimilar metal tubing and a preparation method and an application thereof, the method is characterized in that a dissimilar metal sandwich with appropriate size is prepared, the central section of the dissimilar metal sandwich is a stamping part; mutually cooperated cylindrical male die and the female die with cylindrical core space are employed, the dissimilar metal sandwich is pressed in the female die through a mode that the cylindrical male die supports the stamping part to form the dissimilar metal tubing, and two surfaces of the dissimilar metal sandwich form the inner tube wall and the outer tube wall of the dissimilar metal tubing. According to the invention, no obvious boundary is generated at a combination part of different metals in the dissimilar metal tubing, a welding or electroplating technology is not required during the whole production process, product quality is increased, and energy consumption or environmental pollution can be reduced, metal layer thickness before stretching in the dissimilar metal sandwich can be greatly reduced, and the technical requirement, processing difficulty and cost of the dissimilar metal sandwich can be reduced.

Description

technical field [0001] The invention relates to the field of pipes, in particular to a dissimilar metal pipe and its manufacturing method and application. Background technique [0002] In products in various fields, it is often necessary to use connecting pipes, and the materials of the parts connected at both ends of the connecting pipes are usually different. Taking the exhaust pipe and suction pipe of the compressor in the current prior art as an example, most of them are made of copper, one end is welded with other copper pipes, and the other end is brazed with the iron of the compressor by silver solder flame. Cover or iron shell connection. When flame brazing is used, the copper tube is generally embedded in the iron upper cover or the iron shell, and the solder is heated and melted by the flame to fill the gap between the copper tube and the iron material, so as to achieve the copper tube and the iron shell. The two are soldered together with solder filled in the ga...

AI Technical Summary

Problems solved by technology

Although it avoids the disadvantages of case (1) welded pipe or case (2) electroplated pipe, the final iron pipe section of the dissimilar metal pipe needs to be resistance welded with the upper cover or shell, and the copper pipe section needs to be welded with other copper pipes Therefore, both the iron pipe section and the copper pipe section must have a certain height as a welding position for subsequent welding with other parts, so there is a higher requirement for the thickness of the composite layer of different metal materials in the dissimilar metal composite (The thickness of each layer needs to be greater than 2mm to make the stretched pipe form a welding position with a suitable width), which increases the technical requirements, processing difficulty and cost of dissimilar metal composite parts

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