Method for manufacturing aluminum alloy section for underframe of rail transit vehicle body

Abstract

The invention discloses a method for manufacturing an aluminum alloy section for an underframe of a rail transit vehicle body. The method comprises the following steps of: a, providing materials of a cast rod; b, melting the cast rod; c, casting the cast rod; d, performing homogenization treatment; e, performing surface treatment of the cast rod; f, heating the cast rod; g, heating a mould; h, performing extrusion production; i, performing online quenching; and j, ageing the section. In the method, parameters in the steps are strictly controlled; larger section and better comprehensive performance of the aluminum section can be obtained; the needs in using the aluminum section vehicle body are met; the manufacturing cost of the vehicle body is lowered, and the weight of the vehicle body is reduced; the shortcomings of large mass, great difficulty in maintenance, expensive auxiliary equipment and the like of a steel-structure vehicle body are eliminated; by adopting the method disclosed by the invention, the energy consumption is just 1 / 5 of that of stainless steel, the water consumption is just 1 / 5 of that of a stainless steel carriage, and the weight of the carriage is reduced by1 / 3; and moreover, the strength at non-proportional extension of the section can reach over 245 MPa, the tensile strength can reach over 290 MPA, and the percentage elongation after fracture can reach over 10%.

Description

technical field [0001] The invention belongs to the field of aluminum alloy manufacturing, and in particular relates to the manufacture of aluminum alloy profiles for rail transit car body underframes. Background technique [0002] In the prior art, the cross-section of aluminum alloy profiles for rail transit vehicles is relatively small, which results in more welds, increased welding deformation, and difficult assembly; welding will cause performance degradation, and more welding processes will cause the entire car body to be damaged. performance degradation. The shape of the aluminum alloy profile for the chassis is relatively complex, the wall thickness difference is large, and there are many internal ribs, which are prone to local performance failures. However, in the production process of large-section profiles, if the process is not properly selected, many unnecessary defects will occur in the profiles. [0003] This method mainly proceeds from the perspective of im...

AI Technical Summary

Problems solved by technology

[0002] In the prior art, the cross-section of aluminum alloy profiles for rail transit vehicles is relatively small, which results in more welds, increased welding deformation, and difficult assembly; welding will cause performance degradation, and more welding processes will cause the entire car body to be damaged. performance degradation

The shape of the aluminum alloy profile for the chassis is relatively complex, the wall thickness difference is large, and there are many internal ribs, which are prone to local performance failures

However, in the production process of large-section profiles, if the process is not properly selected, the profiles will have many unnecessary defects.

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