Method for controlling aldural stretch forming covering surface quality

Abstract

The present invention relates to a method for controlling the surface quality of the stretching forming coating of high-strength aluminum alloy, and comprises the steps that the stretching formed roughcast is correctly arranged on the stretching forming lathe and the work station; stable and middle stretching forming speed is adopted for the operation; the deformation volume of the pre-stretching forming is controlled within the range of 1 percent to 1.5 percent; the pre-stretching formed roughcast is undertaken the solid-melting processing, and is aged for 20 to 25 hours at the room temperature, and then is performed the second (final) stretching forming. Through the correct installation of the material on the work station and the device, the material stays at the uniform plastic deformation status during the stretching forming process, so that the appearance of the coating is obtained with the minimum extension rate; through the control of the pre-stretching forming deformation volume, the problems such as the large plastic deformation and large material crystal grain are prevented during the solid-melting processing heating process. The problems that the appearance accuracy is poor for large crystal grain appears on the surface or for the less stretching deformation volume are resolved during the stretching forming of the high-strength aluminum alloy coating.

Description

technical field [0001] The present invention relates to a method for controlling the surface quality of high-strength aluminum alloy skin during stretch forming, more specifically, the present invention relates to a method for controlling high-strength 7075-"O" state aluminum alloy sheet during stretch forming Process method to ensure shape accuracy and control material surface quality. The 7075-"O" state aluminum alloy sheet described in the present invention includes, but is not limited to, the 7075-"O" state aluminum alloy sheet, and may also be a high-strength aluminum alloy sheet in the LC4-"M" state. Background technique [0002] The commonly used high-strength aluminum alloy sheet material in the prior art has a certain relationship between the recrystallized grain size and the degree of deformation under a certain temperature condition. High-strength aluminum alloys generally do not recrystallize when the degree of deformation is small, and the grains remain in thei...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the contradictory problem that the surface of high-strength aluminum alloy skin parts is often prone to coarse grains due to large deformation, or the accuracy of skin shape is poor due to insufficient stretch deformation, the task of the present invention is to Provide a method that can effectively control the deformation amount of high-strength aluminum alloy skin material and the state of material deformation in the stretch forming process, obtain the skin shape with a small elongation rate and have high accuracy, and are not prone to coarse-grained surface defects. Stretch forming method with good surface quality