Processing Technology of Large Size Directly Forming Square and Rectangular Tube

Abstract

The invention discloses a machining technique for a high-specification directly formed square rectangular pipe. The machining technique comprises the following steps: (1) preparing materials; (2) uncoiling and flattening; (3) cropping and butt welding; (4) storing materials with an accumulator; (5) forming; (6) welding at high frequency; (7) removing internal and external burrs and cooling weld joints; (8) positioning and straightening; (9) sizing and saw-cutting; and (10) inspecting finished products and putting into storage. The machining technique for the high-specification directly formed square rectangular pipe provided by the invention is beneficial to seizing the industry development opportunity by enterprises, improving core competitiveness, achieving sustainable development of the enterprises, improving the production level of building steel structures of China, and promoting the development of environment-friendly building industry.

Description

technical field [0001] The invention relates to the field of square and rectangular tubes, in particular to a processing technology for directly forming large-scale square and rectangular tubes. Background technique [0002] At first, the rectangular tubes produced abroad basically adopted the round-to-square process. The process is to cold-bend it into a circle first, and then heat the round tube to the normalizing temperature, and then transform it into a square rectangular tube in the sizing process. The advantages of this process are that the finished steel tube has small residual stress and the radius of the corner arc is small, but High energy consumption, high cost, poor surface quality. Now foreign countries basically adopt the cold round-to-square process. The advantages of cold-state round-to-square transformation are high dimensional accuracy, good weld quality, sharp corners and regular shapes. The disadvantages are large construction investment and hardening of...

AI Technical Summary

Problems solved by technology

The process is to cold-bend it into a circle first, and then heat the round tube to the normalizing temperature, and then transform it into a square rectangular tube in the sizing process. The advantages of this process are that the finished steel tube has small residual stress and the radius of the corner arc is small, but High energy consumption, high cost, poor surface quality

Now foreign countries basically adopt the cold round-to-square process. The advantages of cold-state round-to-square transformation are high dimensional accuracy, good weld quality, sharp corners and regular shapes. The disadvantages are large construction investment and hardening of the corners. heavier

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