期刊
REVIEWS ON ADVANCED MATERIALS SCIENCE
卷 60, 期 1, 页码 631-642出版社
DE GRUYTER POLAND SP Z O O
DOI: 10.1515/rams-2021-0048
关键词
residual stress; TVSR; dimensional stability; machining deformation; FEM
资金
- Aeronautical Science Foundation of China [2019ZE051002]
Residual stress generated during blank forming and machining significantly affects the dimensional stability of mechanical parts. Increasing equivalent bending stiffness and conducting thermal vibration stress relief can help reduce deformations in thin-walled workpieces. Morphology optimization and TVSR process can effectively control residual stress and machining deformation in thin-walled parts.
Residual stress generated during the blank forming and machining process significantly influences the dimensional stability of the mechanical parts. The equivalent bending stiffness and thermal vibration stress relief (TVSR) are two factors that affect the deformation of thin-walled workpiece. To increase the machining accuracy, on the one hand, increase the equivalent bending stiffness in manufacturing, and on the other hand, usually conduct the stress relief process to reduce the residual stress in manufacturing. In the present study, morphology optimization and TVSR process are conducted on a thin-walled part Specimen B of 7075 aluminum alloy to control the residual stress and machining deformation before finish machining. As a contrast, Specimen A is machined in one step. The deformations vary with time of Specimen A and B are measured. The corresponding finite element model is built to further study the stress and distortion during the machining process. Results showed that (1) deformation decreased with the increase of equivalent bending stiffness, compared with Specimen A, the maximum deformation of Specimen B decreased by 58.28%. (2) The final maximum deformation of Specimen B can be reduced by 38.33% by topology reinforcement to improve the equivalent stiffness and TVSR to reduce the residual stress.
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