Process of integrally shaping U-shaped bifurcated pipe

Abstract

The invention relates to the technical field of bifurcated pipe manufacturing, in particular to a process of integrally shaping a U-shaped bifurcated pipe. The invention is characterized by adopting the following steps of: (1) intermediate frequency heating: adopting an intermediate frequency heating furnace to heat blanked material to 850 to 1200 DEG C; (2) first-time integrally shaping: adopting a Y-shaped forging mould to forge the material heated by the intermediate frequency furnace to a Y-shaped rod; (3) shaping by inner-hole drilling and milling: adopting a drilling device to drill a Y-shaped inner channel in the Y-shaped rod; and (4) shaping by bending: bending the V-shaped head of the Y-shaped rod to U-shape so as to obtain the U-shaped bifurcated pipe. Compared with the prior art, the process adopts technologies of die forging and extrusion to realize the integral shaping of U-shaped bifurcated pipe through die forging and extrusion. The pressure-resistance of the U-shaped bifurcated pipe manufactured by the process provided by the invention is greatly higher than that of U-shaped bifurcated pipe processed by welding and is not apt to crack; the manufacturing cost is just equal to 50 to 60 percent of that of the welding process; and the trouble of liquid penetration can be avoided due to no welding line.

Description

[technical field] [0001] The invention relates to the technical field of bifurcated pipe preparation, in particular to an integral molding process of a U-shaped bifurcated pipe. [Background technique] [0002] In the past, there was no overall manufacturing technology, and the U-shaped bifurcated pipe manufacturing industry at home and abroad used welding technology, and "welding is not suitable" was marked on the diagram, because the working environment of U-shaped bifurcated pipes in power plant boilers is high temperature and high pressure. The temperature is greater than 400°C and the pressure is greater than 16Mpa, so there are many hidden dangers in the welding process: [0003] 1. The welding stress is concentrated, which is easy to cause the tube to burst; [0004] 2. Welding is a manual operation, and the quality of the weld seam is guaranteed by hand, so it is quite difficult; [0005] 3. It is very difficult and demanding to take and evaluate films. Using argon ...

AI Technical Summary

Problems solved by technology

[0002] In the past, there was no overall manufacturing technology, and the U-shaped bifurcated pipe manufacturing industry at home and abroad used welding technology, and "welding is not suitable" was marked on the diagram, because the working environment of U-shaped bifurcated pipes in power plant boilers is high temperature and high pressure. The temperature is greater than 400°C and the pressure is greater than 16Mpa, so there are many hidden dangers in the welding process:

[0003] 1. The welding stress is concentrated, which is easy to cause the tube to burst;

[0004] 2. Welding is a manual operation, and the quality of the weld seam is guaranteed by hand, so it is quite difficult;

[0005] 3. It is very difficult and demanding to take and evaluate fi

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