A Hot Working Method for Improving Microstructure and Properties of Variable Cross-section Aluminum Alloy Die Forgings

Abstract

The invention belongs to the technical field of hot working of section-variable aluminum alloy die forgings, and in particular relates to a hot working method for improving the structure and the performance of a section-variable aluminum alloy die forging. The method is characterized in that a moulding bed is designed and made according to the section-variable structure of the aluminum alloy die forging; a blank is separated and shaped by using the moulding bed; a preforging die is designed and made according to the section-variable profile of the aluminum alloy die forging; the preforging die is dimensioned to have a certain deformation allowance for the next forging; the blank is preforged by the preforging die, so that the blank is fixed and locally machined through the perforging die and each variable section is uniform in deformation; a final forging die is designed and made according to the final size of the variable sections of the aluminum alloy die forging; and forming and forging of the blank are conducted by the final forging die. The method enables the sections of all parts of the section-variable aluminum alloy die forging to be consistent, so that the hardenability of heat treatment and the uniformity of the structure property are guaranteed, and the whole performance of the section-variable aluminum alloy die forging is largely improved.

Description

technical field [0001] The invention relates to the technical field of thermal processing of variable-section aluminum alloy die forgings. Background technique [0002] The developed variable cross-section aluminum alloy die forgings have relatively large cross-section changes, the maximum change in equivalent cross-section is 3.12 times, and the maximum change in equivalent height is 13 times. Such a large cross-section change will lead to a large amount of deformation during the forging process. The microstructure formed will be very different, so that the mechanical properties of different parts of the same die forging are difficult to be the same. Therefore, it is necessary to reasonably design the billet structure during the forging process of variable cross-section aluminum alloy die forgings, and optimize the amount of deformation. And in the subsequent heat treatment process of variable cross-section aluminum alloy die forgings, the microstructure of variable cross-s...

AI Technical Summary

Problems solved by technology

[0007] The technical problems to be solved by the present invention are: optimize the blank-making structure of variable-section aluminum alloy die forgings, improve blank-making efficiency, and ensure dimensional consistency; rationally distribute the deformation of each section during the forging process of variable-section aluminum alloy die forgings to ensure uniform deformation Consistent, variable cross-section aluminum alloy die forgings are in good condition; variable cross-section aluminum alloy die forgings are machined before heat treatment to reduce the cross-sectional size of thick and large parts, so that the hardenability of each part during heat treatment remains consistent, ensuring that the variable cross-section aluminum alloy Die forgings have uniform structure and consistent performance