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RISS 인기검색어
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- 저자 : Yunguang Zhou (검색결과 2 건)
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Yadong Gong,Yunguang Zhou,Xuelong Wen,Jun Cheng,Yao Sun,Lianjie Ma 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.7
Nickel-based single crystal superalloy has no grain boundary, which leads to the removal mechanism difference between single crystal material and polycrystalline material. Firstly, the removal mechanism of grinding nickel-based single crystal superalloy is analysed. Then, the developed prediction model of the tangential force F t and the normal force F n are established. Forthermore, the impacts of grinding parameters on grinding force and microstructure of grinding surface and sub-surface are analysed. Finally, some measurements to reduce or prevent recrystallization are proposed. As a result, the most shear slipping planes of nickel-based single crystal superalloy are {111} planes; with the increasing of the feeding rate and grinding depth, the micro-grinding force and the thickness of subsurface plastic deformation increase; the micro-grinding force and the thickness of subsurface plastic deformation decrease with the increasing of spindle speed. These results have some theoretical and engineering significance to the production of single crystal material parts.
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Qi Gao,Yadong Gong,Yunguang Zhou,Xuelong Wen 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.1
Micro-milling is widely used as a method for machining of micro-parts with high precision and efficiency. Taking the nickel-based single-crystal superalloy DD98 as the research object, the crystal characteristics of single-crystal materials were analysed, and the removal mechanism of single-crystal micro-milled parts was described. Based on molecular dynamics, a simulation model for nickel-based single-crystal superalloy DD98 micro-milling was established. Based on the response surface method of central composite design, the influences of spindle speed, feed rate, and milling depth on the surface roughness were examined, and a second-order regression model of the DD98 surface roughness was established. Using analysis of variance and the residuals of the model, a significant influence on surface roughness was found in the following order from large to small: Feed rate, spindle speed, and milling depth. Comparisons were conducted between the micro-milling experimental values and the predicted model values for different process parameters. The results show that the model fit is relatively high, and the adaptability is good. Scanning electron microscopy analysis of the micro-milling surfaces was performed to verify the slip and the removal mechanism of single-crystal materials. These results offer a theoretical reference and experimental basis for micro-milling of single-crystal materials.
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