Large-caliber PVDF pipe bend forming process

Abstract

The invention discloses a large-diameter PVDF pipe elbow forming process. It includes the steps of blanking, heating, continuous heating, bending, cooling and reclaiming. The invention adopts a constant temperature method to heat the PVDF pipe material in a continuous rolling manner, so that the inside and outside of the pipe are heated fully and evenly. By controlling the temperature of the pipe to be heated and softened, the bending method of the filler is used when the pipe is bent, which effectively controls the distortion of the cross-sectional shape of the pipe when it is bent. Defects such as wrinkling and large cross-sectional thickness error; and through effective control of the ambient temperature, the heating temperature of the pipe, the preheating temperature of the mold and the filler, the size of the pipe after bending and forming is kept consistent; in addition, after bending and forming The bent pipe is kept in the mold for heat preservation process. Through the control of temperature and time, the internal stress is eliminated, and the springback problem of the pipe can be effectively solved, so that high-quality PVDF bent pipe can be manufactured, which is suitable for various occasions.

Description

technical field [0001] The invention relates to a PVDF pipe elbow forming process, in particular to a large-diameter PVDF pipe elbow forming process. Background technique [0002] In electric power and large power grid projects, the converter valve as a key component is under high power and high load working conditions, and will emit a large amount of heat during work, which needs to be effectively cooled. The national standard stipulates that the cooling method is water cooling. Therefore, in order to ensure the normal operation of the electric power and grid system, the water cooling system of the converter valve needs to be able to operate stably and effectively dissipate the heat of the converter valve. At present, a large number of PVDF pipes with good chemical corrosion resistance, high temperature resistance and oxidation resistance are used as medium transmission pipes in the water cooling system of the diverter valve. However, at present, the bending and forming p...

AI Technical Summary

Problems solved by technology

However, at present, the bending and forming process of large-diameter PVDF pipes exceeding Φ75 is very backward. The bent PVDF pipes have defects such as cross-sectional shape distortion, wrinkling, and large cross-sectional thickness errors. Leakage, abnormal deformation, and rupture may occur during use. , there are hidden dangers in use, and the scrap rate in production is high, wasting resources

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