Heat treatment technology of portal frame

Abstract

The invention relates to the field of portal frame machining technologies, and particularly discloses a heat treatment technology of a portal frame. The heat treatment technology comprises the steps that (1) workpiece detection and correction are carried out; (2) degreasing is carried out; (3) normalizing is carried out, and the normalizing temperature ranges from 850 DEG C to 870 DEG C; (4) normalizing follow-up work is carried out; (5) stress relieving tempering is carried out, and the tempering temperature ranges from 300 DEG C to 350 DEG C; and (6) tempering follow-up work is carried out. According to the heat treatment technology, the defects in the prior art are overcome, a brand-new portal frame machining method is provided, and by means of one time of high-temperature normalizing and one time of low-temperature tempering, the grain size in the portal frame is uniform and is refined; and high strength and high toughness are achieved, the service life is long, and the comprehensive performance of the portal frame obtained through heat treatment is greatly improved.

Description

technical field [0001] The invention relates to the field of portal frame processing technology, and in particular discloses a portal frame heat treatment process. Background technique [0002] At present, the existing portal frame includes connecting plate 1, connecting plate 2, and a square tube arm. The square tube arm is welded by two square tubes, so the process is complicated, the cost is high, and the efficiency is low. The welding seam has air holes and poor fusion, so the strength of the square tube arm is not high, and the structural performance is poor. Connecting plate one connects with train body through positioning hole one, fixing hole one simultaneously, wiring hole one connects ground wire; Move, resulting in lax door closing or closing the wrong door, so its sealing and sound insulation effect is poor. Simultaneously, it is lax to close, closes the wrong door, has potential safety hazard, and easily causes safety accident. Contents of the invention [...

AI Technical Summary

Problems solved by technology

[0002] At present, the existing portal frame includes connecting plate 1, connecting plate 2, and a square tube arm. The square tube arm is welded by two square tubes, so the process is complicated, the cost is high, and the efficiency is low. There are pores in the weld seam, and the fusion is poor, so the strength of the square tube arm is not high, and the structural performance is poor

Connecting plate one connects with train body through positioning hole one, fixing hole one simultaneously, wiring hole one connects ground wire; Move, resulting in lax door closing or closing the wrong door, so its sealing and sound insulation effect is poor

At the same time, it is not tightly closed and the wrong door is closed, which has potential safety hazards and is likely to cause safety accidents.