High-speed bullet train large curved surface plate ridge fast superplastic forming die and method

Abstract

The invention provides a high-speed bullet train large curved surface plate ridge fast superplastic forming die. The high-speed bullet train large curved surface plate ridge fast superplastic formingdie comprises an upper die body and a lower die body, wherein the upper die body and the lower die body are used for carrying out superplastic forming on a plate material. A forming groove for forminga plate forming surface is formed in the lower die body, and a concave die which is opposite to the forming groove and is used for extruding the plate material into the forming groove is formed on the upper die body in a stretching mode. An air inlet channel communicated to the inner end face of the upper die body and used for introducing air into the plate material to form air pressure through expansion is further formed in the upper die body. The concave die abuts against the plate material to extrude the plate material into the forming groove, and air expansion forming is carried out on the plate material extruded into the forming groove through the air inlet channel. By adopting the mode of combining the concave die and air expansion forming, in the plate material forming process, theconcave die is used for extruding the plate material to achieve forming and complementation of the plate material, and surface folding of the plate material is relieved; and then through the air expansion forming mode, coexistence of macro domain large dimension and local small dimension of the plate material can be achieved, and the forming efficiency of superplastic forming is improved. The invention further provides a high-speed bullet train large curved surface plate ridge fast superplastic forming method.

Description

technical field [0001] The invention relates to the technical field of superplastic forming, and more specifically relates to a fast superplastic forming mold and a forming method for large curved plate ridge lines of high-speed trains. Background technique [0002] The lightweight of rail vehicles is of great significance to improve the performance of high-speed trains. Aluminum alloy plays an important role in rail transit and automobile lightweight. Aluminum alloy replaces traditional steel materials to make the body, which can reduce the weight of the body by 50% and reduce fuel consumption by 28%; under the same bearing force, aluminum alloy is 60% lighter than steel; under the same impact, aluminum alloy can absorb 50% more impact than steel plate more secure. [0003] Under cold stamping conditions, compared with steel plates, aluminum alloy sheets have the disadvantages of low plasticity and large springback, but in the superplastic state, the high-temperature form...

AI Technical Summary

Problems solved by technology

Superplastic forming is a forming cycle process. The upper mold 1` and the lower mold 2` clamp the plate 3` between them, the upper mold 1` is provided with air holes 4`, and the lower mold 2` is provided with forming grooves 5 `, the plate 3` is deformed into the forming groove 5` by the air pressure of the air hole 4`. The forming process includes blank preparation, heating, lubrication, loading, forming and unloading. The time of one forming cycle is equal to each The sum of the time spent in the link is not efficient

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