Effects of tool edge radius and rake angle on ductile machining process of CaF 2
Effects of tool edge radius and rake angle on ductile machining process of CaF 2
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DOI：
10.1504/ijnm.2011.042476
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发表时间：
2011-09
影响因子：
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通讯作者：
Mingjun Chen;W. Jiang;Mingquan Li
中科院分区：
文献类型：
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作者：
Mingjun Chen;W. Jiang;Mingquan Li
采用有限元方法研究了亚微米级CaF 2的正交切削过程，分析了刀具半径对切削力、切削应力和切屑形成的影响。试验结果表明，增大刀具刃口半径，可显著提高切削力，减小切屑厚度。在切削区产生静水压力（~2 GPa）。高压下材料的体积随着边缘半径的增加而增加。研究了刀具前角对切削应力和切屑形成的影响。结果表明，增加刀具前角会导致应力显著增加，切屑厚度减小。模拟结果表明，超精密切削CaF 2的最佳刀具前角为-20°。模拟结果可用于优化CaF 2切削刀具几何设计。
The submicron level orthogonal cutting process of CaF 2 has been investigated by the finite element approach, and the effects of tool edge radius on cutting force, cutting stress and chip formation were investigated. T results indicate that increasing the tool edge radius causes a significant increase in thrust force and a decrease in chip thickness. A hydrostatic pressure (~2 GPa) is generated in the cutting region. The volume of the material under high pressure increases with the edge radius. The effects of tool rake angle on cutting stress and chip formation were also investigated. The results indicate that increasing the tool rake angle causes a significant increase in stress and a decrease in chip thickness. The simulation results from the present study show the optimal tool rake angle to the ultra-precision cutting of CaF 2 is –20°. The simulation results from the present study can be applied for optimising tool geometry design in CaF 2 machining.