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: adoptinga 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 justequal 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 forming process of a U-shaped bifurcated pipe. [Background technique] [0002] In the past, there was no overall manufacturing technology. U-shaped bifurcated pipes were welded in domestic and foreign manufacturing industries, and “unsuitable for welding” was indicated on the map. Because the working environment of U-shaped bifurcated pipes in power station boilers was high temperature and high pressure, The temperature is greater than 400℃ and the pressure is greater than 16Mpa, so the welding process has many hidden dangers of quality factors: [0003] 1. Concentration of welding stress can easily cause pipe burst; [0004] 2. Welding is a manual operation, and the quality of the weld is guaranteed by hand, so it is quite difficult; [0005] 3. The filming and evaluation are difficult and demanding. The bottoming with argon arc welding and gas shielded ...

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 films. Using argon arc welding as a base and then using gas shielded welding will cost high, and the working hours will be long, and inward welding lumps will be formed. The ball passing rate of pipe fittings will be reduced by at least 20%. It is a crucial technical standard in boiler manufacturing; while direct gas shielded welding, because the weld seam cannot be welded to the bottom of the pipe wall, there will be false interlayer weld seams when filming, which brings great difficulty to film evaluation

[0006] To sum up, the power station boiler industry has always been a bottleneck in the welding of U-shaped bifurcated tubes, which is not only labor-intensive, time-consuming, and unstable in quality, but also has a high repair rate and scrap rate

Images