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- 저자 : Miaoxuan Li (검색결과 2 건)
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Research on the sticking-sliding contact ratio in high-speed cutting of cupronickel B10
Miaoxuan Li,Daochun Xu,Ziyi Cui,Zhi Xie 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.3
Accurate understanding of the frictional behavior at the tool-chip interface is critical for the cutting process. To quantitatively analyze the ratio of the sticking contact length to tool-chip contact interface length, a concise calculation model was proposed. Orthogonal cutting experiments and friction experiments were conducted to acquire the friction coefficients for use as input parameters to the model. Calculations found that the ratio, the sliding contact length, and the tool-chip contact interface length showed downward tendencies with increasing cutting speed. The maximum value of the ratio was 63.2 %, achieved at 1000 m/min, whereas the minimum was 58.6 %, achieved at 800 m/min. Furthermore, as the cutting speed rises, the sliding and apparent friction coefficients decrease, while the sticking friction coefficient remains nearly constant. The findings are helpful to improve people's cognition of sticking-sliding contact, the quality of machining, and determine the thickness and length of the tool coating.
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Zhi Xie,Daochun Xu,Ziyi Cui,Miaoxuan Li 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.3
Cupronickel B10—an important material widely used in the aero industry—has excellent mechanical and physical properties, such as corrosion resistance and ductility. The present study conducted a quasi-static test and split Hopkinson pressure bar (SHPB) test to obtain the quasi-static and dynamic mechanical properties of cupronickel B10, respectively. In these two experiments, the parameters needed for material constitutive models in cutting simulation are derived. However, the impact deformation temperature in the SHPB experiment has long been ignored, resulting in insufficient simulation accuracy. Hence, the impact deformation temperature is referenced to modify material constitutive models. Simulation results of the models are validated in orthogonal cutting experiments. Validation shows that Johnson-Cook class models are superior in simulating the chip form while Drucker-Prager class models are suitable for forecasting the cutting force and temperature. In particular, modified Drucker-Prager models can reduce the error of cutting force F C to 18.01 %.
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