ABSTRACT During single-point diamond turning of hard and brittle materials, tool wear is a dominant factor that influences machinability. In the wear process, micro grooves on the flank face is an important character of tool wear, which leads to the formation of subcutting edges and the ductile to brittle transition. In this paper, classical molecular dynamic simulations of nanometric cutting of silicon by a diamond tool with V-shape grooves were carried out to explore the effect of groove geometry on the workpiece and tool integrity. The evolution of tool wear and machined surface integrity was discussed. Simulation result shows that grooves have a significant influence on the stress and temperature distributions of the tool, which has a great influence on tool deterioration. Grooves with sharp edges will lead to severe tool wear and bring deep subsurface damage of the machined surface. However, the subsurface damage of the machined surface can be restrained with blunt grooves since the pressure is reduced. With a comprehensive understanding and controlling of groove, tool wear can be suppressed and high-quality surface can be achieved.

中文翻译：

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金刚石刀具微槽对硅切削的影响：分子动力学研究

摘要 在硬脆材料的单点金刚石车削过程中，刀具磨损是影响可加工性的主要因素。在磨损过程中，后刀面上的微槽是刀具磨损的一个重要特征，它导致切刃的形成和韧脆转变。在本文中，通过具有 V 形凹槽的金刚石刀具对硅进行纳米切割的经典分子动力学模拟，以探索凹槽几何形状对工件和刀具完整性的影响。讨论了刀具磨损和加工表面完整性的演变。仿真结果表明，凹槽对刀具的应力和温度分布有显着影响，对刀具劣化有很大影响。带有锋利边缘的凹槽会导致刀具严重磨损，并给加工表面带来深层的亚表面损伤。然而，由于压力降低，加工表面的次表面损伤可以用钝槽来限制。全面了解和控制凹槽，可以抑制刀具磨损，获得高质量的表面。