Hot working method for improving structure and performance of section-variable aluminum alloy die forging

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 hot processing of variable-section aluminum alloy die forgings. Background technique

[0002] The developed variable-section aluminum alloy die forgings have relatively large changes in cross-section. The maximum change of the equivalent section is 3.12 times, and the maximum change of the equivalent height is 13 times. Such a large cross-section change will lead to a large amount of deformation during the forging process. The structure 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 blank structure and optimize the deformation amount during the forging process of the variable-section aluminum alloy die forging. And in the process of subsequent heat treatment of the variable-section aluminum alloy die forgings, the microstructure of the variable-section aluminum all...

Examples

Embodiment

[0023] The material of this variable-section aluminum alloy die forging is 7050-T74, which is an ultra-high-strength aluminum alloy. The outline size of the variable-section aluminum alloy die forging is 765mm × 380mm × 240mm, the maximum section thickness is 392mm, the minimum section size is 30mm, and the section size is 30mm. The dimensional change is large, and it is a key load-bearing structural member. It is subject to alternating fatigue loads. It requires a uniform structure and excellent comprehensive performance indicators. A total of 3 aluminum alloy die forgings with variable cross-section were used for the test.

[0024] (1) Cut a prefabricated sheet with a size of 177×280×718 and a weight of 99.6kg by wire cutting, and use a 1600T press with a tire mold designed and manufactured according to the structure of aluminum alloy die forgings. material and shaping. In the process of material distribution and shaping, the heating temperature is 420°C, and the material d...

technical field

[0001] The invention relates to the technical field of hot processing of variable-section aluminum alloy die forgings. Background technique

[0002] The developed variable-section aluminum alloy die forgings have relatively large changes in cross-section. The maximum change of the equivalent section is 3.12 times, and the maximum change of the equivalent height is 13 times. Such a large cross-section change will lead to a large amount of deformation during the forging process. The structure 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 blank structure and optimize the deformation amount during the forging process of the variable-section aluminum alloy die forging. And in the process of subsequent heat treatment of the variable-section aluminum alloy die forgings, the microstructure of the variable-section aluminum all...

Examples

Embodiment

[0023] The material of this variable-section aluminum alloy die forging is 7050-T74, which is an ultra-high-strength aluminum alloy. The outline size of the variable-section aluminum alloy die forging is 765mm × 380mm × 240mm, the maximum section thickness is 392mm, the minimum section size is 30mm, and the section size is 30mm. The dimensional change is large, and it is a key load-bearing structural member. It is subject to alternating fatigue loads. It requires a uniform structure and excellent comprehensive performance indicators. A total of 3 aluminum alloy die forgings with variable cross-section were used for the test.

[0024] (1) Cut a prefabricated sheet with a size of 177×280×718 and a weight of 99.6kg by wire cutting, and use a 1600T press with a tire mold designed and manufactured according to the structure of aluminum alloy die forgings. material and shaping. In the process of material distribution and shaping, the heating temperature is 420°C, and the material d...