Forming process for stand column of stainless steel car body side wall

Abstract

The invention relates to a forming process for a stand column of a stainless steel car body side wall. The forming process comprises the following steps of: (1) material preparation: processing a whole stainless steel plate into an unfolding shape without being flanged through laser cutting, and remaining flanging capacity and process notches, and a plurality of triangle notches is arranged on the column surface fitting with the side wall panels; (2) compressing: putting the cut plate material in a compressing mould, and forming at one time integrally through mould pressing; and (3) reshaping: carrying out final adjusting and reshaping on the compressed workpiece according to a drawing size, and forming the stand column meeting the requirement of design. The compression forming process at one time integrally is adopted, the process steps are simple, the manufacturing cost is low, the production efficiency is greatly improved, the surface quality and the geometric dimensioning of each position on the stand column are ensured on the premise of ensuring the structural strength of the formed stand column, and the higher requirement of the stainless steel car body side wall of a high-speed motor train unit on the strength of the stand column and the surface quality are completely met.

Description

technical field [0001] The invention relates to a forming process for a column of a side wall of a stainless steel car body, belonging to the technical field of rail vehicle car body manufacturing. Background technique [0002] The stainless steel car body of high-speed EMU is an integral welded structure composed of underframe, side wall, end wall and roof. Among them, the side wall is the most important exposed part of the rail vehicle, and its flatness directly affects the final assembly of the vehicle and the appearance of the product after assembly. [0003] The side wall is framed by welding columns and side beams, and then covered with wall panels by spot welding. Among them, the column is the main force-bearing part of the side wall, and its structure and strength directly determine the overall strength of the side wall. The surface quality of the column and whether the curved part is excessively smooth also determine the overall external surface state of the side ...

AI Technical Summary

Problems solved by technology

During the processing of the column of this structure, the technical difficulty is that the shape is complex, and the curvature of each point on the airfoil is not the same, so it is difficult to form.

If the welded structure is adopted, each section is blanked and then tailor-welded to form, not only the cost is high, the speed is slow, and the production efficiency is low, but also because of the large heat input during welding, it will cause distortion of the parts and poor forming quality

With the general molding method, since the airfoil has a small curvature, there will be stress concentration and distortion after molding, and there will be defects such as cracks and wrinkles.

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