FE Simulation of the Ductile Regime Micromachining of Silicon Carbide
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摘要: 针对碳化硅材料在较高切削压力的微切削条件下具有脆塑性转变机制,利用专用切削仿真软件Advantedge V5.6,对金刚石刀具微切削碳化硅陶瓷材料的脆塑性转变机制进行了有限元模拟分析,研究了刀具前角、切削速度、切削深度和材料初始温度的变化对材料切削变形、刀-屑接触面最大切削压力、切削力、切削温度的影响变化规律,并与权威文献的实际实验的切削力数据进行了对比,验证了仿真的有效性,获得了较好的模拟结果。研究结果表明:-45°负前角刀具、较小的刀尖圆弧半径、较高的切削速度、较小的切削深度更利于有效的实现碳化硅陶瓷塑性域切削。Abstract: SiC has a ductile micromachining manner under condition with high pressure.In this paper,a series of finite element simulation conducted to comprehend the brittle to ductile transitions micromachining of SiC using the commercial Advantedge version5.6 software.The simulations were run at various rake angle,cutting speed,feed,and initial temperatures throughout the thermal softening regime.The changes in the chip formation,maximum cutting forces and pressures at the tool chip interface were studied.In order to verify the accuracy of simulation results,some contrast simulation results with experimental results from the literature were described.The results showed that ductile machining of brittle materials is more efficient under the condition that the rake angle-45�the smaller cutting edge radius is,the higher cutting speed is,and the smaller depth of cut is.
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Key words:
- ceramic cutting tools /
- diamond cutting tools /
- micromachining /
- silicon carbide
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