Method for manufacturing aluminum alloy section for top plate of rail transit vehicle body

Abstract

The invention discloses a method for manufacturing an aluminum alloy section for a top plate of a rail transit vehicle body. The method comprises the following steps of: (a) preparing materials for a cast rod; (b) smelting the cast rod; (c) casting the cast rod; (d) performing homogenization treatment; (e) performing surface treatment on the cast rod; (f) heating the cast rod; (g) heating a mold; (h) performing extrusion production; (i) quenching on line; and (j) aging the section. Each parameter in the process is strictly controlled; the aluminum section can achieve a larger cross section and higher comprehensive properties, the using requirement of an aluminum section vehicle body is met, the manufacturing cost and self weight of the vehicle body are reduced, and the defects of large mass, high maintenance difficulty, high auxiliary equipment cost and the like of a steel structure vehicle body are overcome; energy consumption is only 1 / 5 of that of stainless steel, water consumption is only 1 / 5 of that of a stainless steel carriage, and the weight of a carriage is reduced by 1 / 3; and the product has superior properties, wherein stipulated non-proportional extension strength is more than 245MPa, tensile strength is more than 290MPa, and elongation after fracture is over 10 percent.

Description

technical field [0001] The invention relates to the field of aluminum alloy manufacturing, in particular to a method for manufacturing an aluminum alloy profile for a rail transit vehicle body roof. Background technique [0002] In the era of rapid development of high-speed railways, for more than ten years, domestic and foreign countries have been discussing about the development of high-speed railways, which is better to use aluminum alloy or stainless steel as the material of the carriage floor? Through the test, it is found that the use of aluminum alloy profiles can initially meet the requirements. However, in the prior art, the cross-section of the aluminum alloy profile for the roof of the rail transit car body is relatively small, which causes more welds, increased welding deformation, and difficult assembly; and welding will cause performance degradation, and more welding processes will Resulting in a decline in the performance of the entire vehicle body. Moreover...

AI Technical Summary

Problems solved by technology

However, in the prior art, the cross-section of the aluminum alloy profile for the roof of the rail transit car body is relatively small, which causes more welds, increased welding deformation, and difficult assembly; and welding will cause performance degradation, and more welding processes will cause a decrease in the performance of the entire vehicle body

Moreover, the production process of the rail transit car body roof is more complicated, the production efficiency is revealed, the production cycle is longer, and the production cost is higher.

The production of large-section profiles is an effective way to solve the above problems. However, the production of large-section profiles is also difficult. In the production process, if the process is not properly selected, many unnecessary defects will be produced on the profiles.

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