Cold bending J type section steel and manufacturing process thereof

Abstract

The invention discloses a cold bending J-shaped steel and a manufacturing technique thereof. The cold bending J-shaped steel with circular arc at the bottom portion has set thickness, one end of the circular arc has a long straight edge, the other end of the circular arc has a short straight edge, and an included angle is formed by the short straight edge and the long straight edge. The manufacturing technique of the cold bending J-shaped steel comprises: (1), a choosing stage of band steel, (2), a rough rolling stage of the cold bending J-shaped steel, (3), a finishing operation stage of the cold bending J-shaped steel, (4), in the rolling and deformation process, the length of each circular arc becomes longer, and the radius of the circular arc of the roller becomes smaller to equal to the product value finally, (5), the center of the circular arc is arranged on a rolling line all the time. The cold bending J-shaped steel and the manufacturing technique have the advantages that the circular arc of the product can be guaranteed not to leave the normal track, the integrality of the circular arc is ensured, the specific size of the rolled circular arc section can be achieved, the smooth transition of the circular arcs of the J-shaped cold bending steel and the fine product quality can be guaranteed, additionally, the technique is reasonable, and can replace imported like product, thereby saving funding for government.

Description

technical field [0001] The invention relates to a cold-formed J-shaped steel and a manufacturing process thereof. Background technique [0002] At present, composite conductive rail structures are used on the tracks of subways and light rails. The above-mentioned composite conductive rails are made of bimetallic materials, that is: the profile body and the wear-resistant coating attached to the profile body. The wear-resistant coating Layers are usually made of cold-formed J-section steel. The cold-formed J-shaped steel as a composite conductive rail requires strict surface precision. Only with reasonable and strict processing technology can the cold-formed J-shaped steel meet its quality requirements. In order to meet the quality requirements of the above products, the commonly used processing technology is continuous rolling and cold bending on the rolling equipment production line. [0003] Recently, someone has applied for a patent on cold-formed J-shaped steel and its...

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Problems solved by technology

[0005] The rolling process disclosed in the above-mentioned patent documents cannot be fully applied to rolling cold-formed J-shaped steel of other shapes, especially when the ratio of the thickness of the steel to its arc radius value is less than 80%, the shapes on both sides of the arc radius are asymmetrical, and the arc radius Cold-formed J-shaped steel with a certain angle formed between the straight segments on both sides

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