Strain-induced semi-solid multi-point compression molding process for aerospace titanium alloy sheet

Abstract

The strain-induced semi-solid multi-point compression molding process for aerospace titanium alloy sheets first cold-forges the original titanium alloy sheets to obtain the aggregated strain energy titanium alloy sheets; then puts the aggregated strain energy titanium alloy sheets into induction heating furnaces Heating and heat preservation treatment, and then use the strain-induced melt activation method to prepare semi-solid titanium alloy sheets; then place the semi-solid titanium alloy sheets in a multi-point mold, adjust the shape of the forming surface of the basic body array of the multi-point mold, and use a press Push the upper mold body of the multi-point mold, and perform semi-solid multi-point press thermoforming on the semi-solid titanium alloy sheet to obtain a semi-solid formed titanium alloy sheet; finally, perform isothermal heat treatment on the semi-solid formed titanium alloy sheet, and then perform finishing The final titanium alloy part is obtained; the invention improves the processing efficiency and forming quality, shortens the working hours; the forming range is relatively wide, and flexible manufacturing can be realized.

Description

technical field [0001] The invention belongs to the technical field of thermoforming of titanium alloy parts, and in particular relates to a strain-induced semi-solid multi-point molding process for aerospace titanium alloy plates. Background technique [0002] With the development of the manufacturing industry, the demand for titanium alloy plates with good mechanical properties is increasing. Titanium and titanium alloys have excellent comprehensive properties such as low density, high specific strength, corrosion resistance, high temperature resistance, non-magnetic, and good welding performance. It is widely used in aircraft landing gear components, frames, beams, fuselage skins, heat shields, compressor discs, blades, drums, high-pressure compressor rotors, and compressor casings. Aerospace vehicles work under extreme conditions such as ultra-high temperature, ultra-low temperature, high vacuum, high stress, and strong corrosion. In addition to requiring superb structur...

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Problems solved by technology

Among them, the hot stamping process after heating in the mold is prone to various defects such as: the internal structure of the material cannot form a spheroidized structure, springback deformation is prone to occur, and the effect of heat treatment is not good; , the production efficiency is low, and high-efficiency production cannot be completed; in aerospace thin-walled structural parts, different parts have different profiles, and a separate mold is required for each profile, which leads to a single shape of the parts produced by a single press

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