Ultra-precision diamond cutting finds wide applications in various areas such as freeform optics, micro-structure arrays and high precision molds. Except for process parameters, machined surface quality is also directly influenced by the state of cutting tool edge. In this paper, a novel method for controlling the tool edge by multi-axis ultrasonic vibration is investigated. Kinematic analysis shows that the effective edge radius can be reduced and varied periodically, which indicates a sharpening effect of the tool. At the first step, numerical simulations including geometrical modelling and molecular dynamics are conducted to lay the theoretical foundation and study the effects of both the process parameters and the material response compared with the traditional ultrasonic vibration assisted cutting. Then, diamond turning, as an experimental approach, is performed to make the final validation of the proposed method based on the analysis of surface roughness, chip formation and tool wear.

超精密金刚石切割在各种领域都有广泛的应用，例如自由形式的光学器件，微结构阵列和高精度模具。除工艺参数外，加工表面质量还直接受切削刃边缘状态的影响。本文研究了一种通过多轴超声振动控制刀具边缘的新方法。运动学分析表明，有效边缘半径可以周期性地减小和变化，这表明该工具具有锐化效果。第一步，进行了包括几何建模和分子动力学在内的数值模拟，以奠定理论基础，并研究工艺参数和材料响应与传统超声振动辅助切削相比的影响。然后，钻石车削