Whole-process manufacturing method of electric-assisted superplastic forming and aging treatment of aluminum-lithium alloy thin-walled components

Abstract

A full-process manufacturing method of electric-assisted superplastic forming and aging treatment for aluminum-lithium alloy thin-walled components, by applying pulse voltage to the aluminum-lithium alloy blank, using the Joule heating effect of the pulse current to rapidly heat the blank and then perform superplastic forming; completed Afterwards, the power is turned off and rapid cooling is used to realize the solution treatment of the formed part; finally, the pulse voltage is applied again to raise the temperature of the aluminum-lithium alloy formed part to the aging temperature, and the mechanical properties of the formed part are significantly improved through the aging treatment. The invention uses pulse current to input extremely high energy into the blank in a very short time, and has the characteristics of high energy, short time, convenient and efficient process of electric assisted forming, affects the structure of the material, promotes the evolution of its microstructure and properties, and has a great impact on metal The fatigue recovery of the material, the grain refinement inside the metal and the healing of micro-cracks play a positive role in many aspects, thereby improving the plastic formability of the metal material.

Description

technical field [0001] The invention relates to a technology in the field of superplastic forming, in particular to a whole-process manufacturing method for electric-assisted superplastic forming and aging treatment of aluminum-lithium alloy thin-walled components. Background technique [0002] Superplastic forming is a thermoforming process. Usually, the mold and the blank are placed in a heating furnace, and after reaching the forming temperature for a certain period of time, gas is introduced until the plate is completely attached to the mold; however, the energy utilization efficiency of this technology is low: the volume mass of the blank It is much smaller than the volume mass of the mold, so most of the energy in the heating process is consumed on the heating mold, and only a small part of the energy is used to heat the blank; at the same time, this process requires the mold to be in a high temperature environment for a long time, which causes great damage to the mold ...

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Problems solved by technology

[0002] Superplastic forming is a thermoforming process. Usually, the mold and the blank are placed in a heating furnace, and after reaching the forming temperature for a certain period of time, gas is introduced until the sheet is completely attached to the mold; but the energy utilization efficiency of this technology is low: the volume mass of the blank It is much smaller than the volume and mass of the mold, so most of the energy is consumed on the heating mold during the heating process, and only a small part of the energy is used to heat the billet; at the same time, the process requires the mold to be in a high temperature environment for a long time, which will cause great damage to the mold and slow down the heating rate of the billet. Slow: Since the main ways of heat transfer in this case are heat conduction and heat radiation, the heat transfer rate is slow; in addition, the superplastic forming process has a long production cycle: the heating and cooling rate of the blank is slow, and the blank forming takes a long time; the surface quality of the component , Performance reduction: Superplastic formed components are exposed to high temperature for a long time, the surface is severely oxidized, the grain grows and coarsens, and the microstructure and performance deteriorate

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