Broad-width large-shell stainless steel hollow profile and manufacturing technology thereof

Abstract

The invention provides a broad-width large-shell stainless steel hollow profile and a manufacturing technology thereof and belongs to the technical field of production of wide, large and thin parts used for a railway vehicle. The profile is formed by making a decorative outside plate, a corrugated plate and an inner plate connected sequentially through lap laser welding, wherein the corrugated plate and the inner plate are located in the middle sandwich layer; the three plates are made of stainless steel plates, the thickness of the decorative outside plate is 1.5-2.5 mm, the surface of the decorative outside plate is subjected to wiredrawing processing or DF processing, the thickness of the inner plate is 1.0-1.5 mm, and the cross section of the decorative outside plate and the cross section of the inner plate are both of a flat plate structure, or the decorative outside plate and the inner plate are profiles having ribbing and formed by roll bending, or profiles with press-bending edges, or bending plates; the thickness of the corrugated plate is 0.5-0.8 mm, a single corrugated cross section of the corrugated plate is in a trapezoidal shape or a rectangular shape, and the cross section of the corrugated plate is of a homogeneous cross section structure or of a variable cross section structure. By means of the stainless steel hollow profile, multifarious small part assembling processes are omitted, the technology is simple, and the efficiency is improved; the profile is good in rigidity and is not prone to deformation during hoisting, transporting and the like.

Description

technical field [0001] The invention belongs to the technical field of production of wide and thin parts for rail passenger cars, and in particular relates to a wide and long thin-shell stainless steel hollow profile and its manufacturing process, which is suitable for a width of 300mm-1250mm, a length of 10000mm-30000mm, and a thickness of 20mm-70mm production of wide and thin parts. Background technique [0002] Aluminum alloy wide hollow profiles are manufactured by volume hot extrusion technology, which can extrude wide and long pieces, and are widely used in rail vehicles. The use of wide and long profiles can greatly reduce the number of parts and simplify the process. However, the corrosion resistance, strength, and fire resistance of aluminum alloy materials are far inferior to those of stainless steel materials. Due to the limitations of the extrusion process, it is impossible to obtain thin-shell high-strength profiles from aluminum alloy wide and long extrusion ...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the technical problems such as complex process, long cycle, low efficiency and poor quality existing in the existing stainless steel plate beam structure and manufacturing process, the present invention provides a wide-width long thin-shell stainless steel hollow profile and its manufacturing process

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