Steel pipe forming device

Abstract

The invention discloses a steel pipe forming device which comprises a steel plate curling device and a steel pipe forming device body, wherein a steel pipe surface heat treatment device is arranged at the discharging end of the steel pipe forming device body and comprises a base, a support box is arranged on the base, a treatment pipe is arranged on the support box, the steel pipe extends into the treatment pipe from one end of the treatment pipe, the steel pipe extends out from the other end of the treatment pipe, a first sealing mechanism is arranged at one end of the treatment pipe, a second sealing mechanism is arranged at the other end of the treatment pipe, and the treatment pipe is connected with an inert gas conveying pipe. The steel pipe forming device further comprises an eddy current heating device. According to the technical scheme, the surface heat treatment device is additionally arranged, argon serves as inert gas, and the situation that the steel pipe reacts with gas in air in the high-temperature heat treatment state and the surface heat treatment effect is affected is avoided. According to the surface heat treatment device, the steel pipe is heated in a vortex mode, the method is safe, and the influence on the environment is avoided.

Description

technical field [0001] The invention relates to the technical field of steel pipe forming, in particular to a mold set for avoiding easy corrosion of formed steel pipes and cracking of welding parts caused by edge folds and warping during the bending process of steel plates. Background technique [0002] If the formed steel pipe is not subjected to surface heat treatment, the hardness is not enough and the surface is easily corroded. The existing method is to heat the steel pipe at a high temperature under hydrogen to heat-treat the surface. Due to the extremely active chemical nature of hydrogen atoms, storage and transportation are inconvenient. The existing method is to obtain hydrogen gas by decomposing liquid ammonia. Liquid ammonia is highly corrosive and highly polluting to the environment. [0003] In the field of industrial pipe making, commonly used pipe making methods include hot rolling, pipe jacking, extrusion, cold rolling, cold drawing, furnace welding, elec...

AI Technical Summary

Problems solved by technology

Especially the first set of horizontal molds, the first set of horizontal molds is responsible for pressing the edges of the steel strip out of the initial arc. The existing first set of horizontal molds usually includes an upper mold and a lower mold. If there is no convexity in the middle of the lower mold For example, as shown in CN201921437869.7, the middle of the lower die used in the forming roll is depressed, and the bending curvature of the steel plate near the lower die is greater than that of the steel plate near the upper die. The steel pipe 1 obtained at this time is as follows figure 1 As shown, the inner diameter of the closing part 1a is closed, but the outer diameter has an opening. At this time, the welded steel pipe is not firm

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