Study on Thermo Mechanical Coupling of the Hybrid Additive and Subtractive Manufacturing Based on Finite Element Model

doi:10.3901/JME.2022.15.274

Abstract

Abstract: In order to explore the coupling effect of temperature and stress field in the additive and subtractive manufacturing process, the Gaussian moving heat source, restart analysis, predefined field and J-C constitutive model are constructed and the accuracy of the model is verified by experiments.The results show that the Gauss line heat source method can not only reduce the amount of calculation, but also ensure the accuracy of the model, and the restart analysis and predefined field realize the good connection of the manufacturing process.With the decrease of temperature, the form of stress changes from thermal stress to machining stress, and the workpiece surface changes from residual tensile stress to residual compressive stress, which shows that the high temperature generated by laser heating has a great impact on the workpiece surface stress in the process of additive manufacturing.After extended the cooling time between additive and subtractive manufacturing process, the residual stress on the workpiece surface changes from positive to negative, which shows that the intervention time of material reduction process has a great influence on the stress state on the workpiece surface.In the process of additive manufacturing, selecting an appropriate subtractive manufacturing temperature is conducive to reducing the impact of residual stress on the surface of workpiece.

Key words: additive and subtractive manufacturing, finite element simulation, process connection, thermo-mechanical coupling, residual stress

CLC Number:

TG156

ZHAO Yuhui, GAO Mengqiu, ZHAO Jibin, WANG Zhiguo, HE Zhenfeng, HE Chen. Study on Thermo Mechanical Coupling of the Hybrid Additive and Subtractive Manufacturing Based on Finite Element Model[J]. Journal of Mechanical Engineering, 2022, 58(15): 274-282.

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