A kind of cold bending forming method of square sharp-angle steel pipe
A technology for cold forming and steel pipe, applied in the field of cold forming, can solve the problems of difficult adjustment, high cost of spare parts, and inability to achieve through-rolling of the same type of products.
Active Publication Date: 2022-01-21
HANKOU STEEL ROLLING MILL WUHAN IRON & STEEL CORP
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Problems solved by technology
[0003] At present, square sharp-angle steel pipes are produced by asymmetrical forming methods, such as figure 1 , during the rolling process, the rolls need to be replaced, and the rolls have to be adjusted many times, which has the disadvantages of difficult adjustment, high cost of spare parts, and inability to realize the same type of products through rolling.
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Embodiment
[0021] The technological process of a square sharp-angle steel pipe is as follows:
[0022] Uncoiling→feeding→cutting→butt welding→stamping→cold forming→high frequency welding→cooling→sizing→straightening→sawing→packing and collecting→storage.
[0023] Wherein the cold bending forming process includes steps:
[0024] (1) Symmetrical molding: combined figure 2 and image 3 As shown, the forming part adopts the four-three-three forming method, specifically four-pass welding small edge forming (first to fourth pass), three-pass waist forming (fifth to seventh pass), three-pass closed forming ( The eighth to tenth pass); in the waist forming process, the rotary single R type compression forming is adopted to effectively realize the symmetrical forming.
[0025] (1.1) Welding small edge forming
[0026] combine Figure 4 As shown, the forming of the welded small edge is to shape the welded small edge 1 on both sides of the steel pipe symmetrically to 70° by rollers at angles ...
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The invention relates to the technical field of cold-bending forming, in particular to a method for cold-bending a square sharp-angled steel pipe. The cold-bending forming method of a square sharp-angled steel pipe designed by the present invention includes a forming stage, an extrusion welding stage, a sizing and shaping stage, and a straightening stage; the forming stage includes welding small edge forming, waist forming, and closed forming; The forming of the welded small side is to symmetrically form the welded small sides of the steel pipe to 70° according to the angles of 20°, 40°, 56°, and 70° by the forming roller; 30° and 40° exert pressure on the symmetrical center of the steel pipe, and the waists on both sides are symmetrically formed to 40°. The closed forming is to act on the symmetrical center of the steel pipe through the sealing sheet, and the steel pipe is solidly bent in three passes. The invention adopts a symmetrical forming method and can realize universal rolling of products with different specifications.
Description
technical field [0001] The invention relates to the technical field of cold-bending forming, in particular to a method for cold-bending a square sharp-angled steel pipe. Background technique [0002] The cold-formed square sharp-angle steel pipe is mainly used in the field of construction machinery. The integrated forming method of the cold-formed square sharp-angle steel pipe reduces the offline welding process, the online welding is stable and controllable, and the smoothness of the weld seam can effectively ensure the rollers to run. [0003] At present, square sharp-angle steel pipes are produced by asymmetrical forming methods, such as figure 1 , in the rolling process, it is necessary to replace the rolls and adjust the rolls many times, which is difficult to adjust, the cost of spare parts is high, and it is impossible to realize the defects of the same type of product through rolling. Contents of the invention [0004] In order to solve the above problems, the obj...
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IPC IPC(8): B21C37/08B21C37/30
CPCB21C37/0803B21C37/30
Inventor 张尧盛珍剑阮建刚闫彬彬雷浩段军科赵亚明韩涛朱成松
Owner HANKOU STEEL ROLLING MILL WUHAN IRON & STEEL CORP