Cold-roll formation method for square cuspidal angle steel pipe
A technology for cold forming and steel pipe, applied in the field of cold forming, can solve the problems of high cost of spare parts, difficult adjustment, and inability to achieve through-rolling of the same type of products.
Active Publication Date: 2020-06-02
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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[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 with 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-roll formation, particularly relates to a cold-roll formation method for a square cuspidal angle steel pipe. The cold-roll formation method for thesquare cuspidal angle steel pipe, designed by the method, comprises a formation stage, an extrusion welding stage, a fixed-diameter shaping stage and a straightening stage; the formation stage comprises welding small-side formation, waist formation and enclosing formation; the welding small-side formation is to carry out welding small-side symmetric formation on the two sides of the steel pipe according to 20 degrees, 40 degrees, 56 degrees and 70 degrees by virtue of a forming roller until the two sides form an angle of 70 degrees; the waist formation is to apply pressure to the center of symmetry of the steel pipe according to 20 degrees, 30 degrees and 40 degrees by virtue of the forming roller; the two waist sides are symmetrically formed to form an angle of 40 degrees; the enclosingformation is to act on the center of symmetry of the steel pipe by virtue of an enclosing plate; and the steel pipe is subjected to three-pass solid-bending treatment. The cold-roll formation method provided by the invention can realize universal rolling of products of different specifications by adopting a symmetric formation method.
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