Method for manufacturing aluminum alloy section material for floor of rail transport car body

Abstract

The invention discloses a method for manufacturing an aluminum alloy section material for a floor of a rail transport car body. The method comprises the following steps of: (a) preparing raw materials of cast rod; (b) smelting a 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) extruding, (i) performing on-line quenching, and (j) aging to obtain the section material. The method can strictly control various parameters in the process steps, endows the aluminum alloy section material with higher cross-section and better overall performance, meets the requirements for application in aluminum alloy section material car bodies, reduces the manufacturing cost and weight of the car body, and eliminates the problems such as heavy weight of steel structure car body, difficulty in repair and maintenance and high cost of auxiliary equipment. Besides, the energy consumption is 1/5 that of stainless steel, the water consumption is 1/5 that of stainless steel carriages, the weight of carriage is reduced by 1/3, the performance of product is excellent, the proof strength (non-proportional extension strength) can reach more than 255 MPa, the tensile strength can reach more than 300 MPa, and the percentage elongation after fracture can reach more than 11%.

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 car body floor. 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 profiles for rail transit car body floors is relatively small, which causes more welds, increased welding deformation, and difficult assembly; while welding will cause performance degradation, and more welding processes will Resulting in a decline in the performance of the entire vehicle body. Moreover, the pro...

AI Technical Summary

Problems solved by technology

However, in the prior art, the cross-section of the aluminum alloy profiles for rail transit car body floors is relatively small, which causes more welds, increased welding deformation, and difficult assembly; while 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 floor 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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