Bending process of double-layer pipe

Abstract

The invention relates to a bending process of a double-layer pipe, which comprises the following steps that: an outer layer pipe is fed; an inner layer pipe is fed; one end of the inner layer pipe is made into a flared end; the other end of the inner layer pipe is plugged to form a plugging end; the inner and the outer layer pipes are assembled and welded; special solid stuffing for bending pipe is filled inside the pipes; the inner and the outer layer pipes are bent; the special solid stuffing for bending pipe is dissolved; the pipes are cut; and the double-layer pipes are examined. The bending process has the advantages that the solid stuffing is filled between the two layers of pipe, so the stuffing between the two layers of the pipe is free from being smashed during the pipe bending process, effective supporting between the two layers of the pipe can be realized, a satisfactory distance between the outer side surface of the inner layer pipe and the outer layer pipe after the pipe is bent can be maintained, the shape of the bending part is smooth and aesthetic, and the function of the double-layer pipe can be adequately played in the application.

Description

technical field [0001] The invention relates to a pipe bending process of a double-layer pipe. Background technique [0002] In the prior art, since the double-layer pipe has inner and outer pipe walls, the processing difficulty of the double-layer pipe is more difficult when the pipe is bent. Especially for double-layer pipes whose inner pipe wall has a special-shaped surface, because of the uneven surface of the inner pipe wall, the filling material cannot produce a reasonable effect on the inner pipe wall during bending and stretching. [0003] In the prior art, the pipe bending process of the double-layer pipe is: [0004] Outer tube blanking→inner tube blanking→both ends of the inner tube flared→inner and outer tube assembly spot welding→sealing one end of the tube→filling with liquid filler→freezing→bending→scouring→dissolving the inner tube Filling→drying→pipe cutting→completion inspection. [0005] There are problems with the old process: [0006] 1. Because the ...

AI Technical Summary

Problems solved by technology

[0006] 1. Because the original liquid filling material is brittle after being frozen into a solid state, it is easy to be crushed when the pipe is bent, and the support for the pipe is easy to fail, causing the outer surface of the inner pipe to be in contact with the outer pipe, thereby reducing the efficacy of the double-layer pipe , and the bending part becomes more serious

[0007] 2. The antifreeze in the refrigerator seriously corrodes the product equipment, causing product rust and significantly shortening the service life of the equipment

[0008] 3. Because the refrigerator uses freon, it does not meet the environmental protection requirements

[0009] 4. Since the freezing time needs more than 10 hours, the production cycle is long

[0010] 5. Since the refrigerator is arranged next to the pipe bender, it is cold and humid, and the working environment is harsh

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