A kind of hot rolling forming method of U-shaped steel for bridge support

Abstract

The invention relates to a hot rolling forming method of U-shaped steel for a bridge bracket, and belongs to the technical field of a section steel rolling process in the metallurgical industry. According to the technical scheme, the hot rolling forming method includes the steps of rough rolling, multi-slit rolling, finishing forming rolling and finished product rolling; rough rolling is performedby adopting a hole pattern of alternately arranging diamonds and squares, and the last rough rolling hole pattern is a square hole; multi-split rolling adopts an open type hole pattern with upper andlower bidirectional split; finishing forming rolling is three-pass rolling, the hole pattern of first-pass rolling of finishing forming rolling is the open type hole pattern, and the hole pattern ofsecond-pass and third-pass rolling of finishing forming rolling is a closed type hole pattern; and the hole pattern of finished product rolling adopts the open type hole pattern. The hot rolling forming method has the beneficial effects that direct hot rolling forming can be achieved, subsequent machining is omitted, materials are saved, and the finishing product rate is improved by nearly 30%; and the surface stress concentration caused in the machining process is eliminated so that the uniformity of the structure and performance of an entire rolled piece is ensured.

Description

technical field [0001] The invention relates to a hot-rolled forming method of U-shaped steel for bridge supports, and belongs to the technical field of steel rolling technology in the metallurgical industry. Background technique [0002] In recent years, with the country's investment in capital construction, the development of major municipal projects in various places, especially the development of road traffic infrastructure, and the progress of bridge technology, in the field of bridge construction, various bridge supports have been widely used. U-shaped Due to the advantages of beautiful appearance, reasonable stress, and relatively simple node processing, bridge supports are widely used in bridge construction projects. [0003] Due to the deep U-shaped groove, it is difficult for the rolled piece to come out of the pass in the finished pass, and the finished product is prone to twisting at the rolling exit. Therefore, the traditional forming method of U-shaped steel fo...

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Problems solved by technology

[0003] Due to the deep U-shaped groove, it is difficult for the rolled piece to fall out of the pass in the finished pass, and the finished product is prone to twisting at the rolling exit. Therefore, the traditional forming method of U-shaped steel for bridge supports can only be approximate forming. The rolled piece requires further machining to obtain the final product size. This process has high energy consumption and low yield, resulting in a great waste of manpower and material resources.

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