多模调制曲面超精密加工轨迹优化技术

研究了采用单点金刚石超精密车削加工技术(SPDT)加工多模调制曲面过程中的刀具轨迹优化方法,首先,分析了SPDT方法加工多模调制曲面的基本原理;其次,理论分析了平行弦双圆弧插补算法的基本原理,推导了插补误差计算公式。在此基础上,提出采用插补步长伸缩变化方式实现了插补误差的动态控制,并获得了完整的插补计算公式;最后,采用Matlab软件对该插补算法进行了实例仿真分析,并分别与直线插补算法和固定步长双圆弧插补算法进行了对比分析,结果表明,该方法能在保证插补允差的前提下最大程度的减少插补区间数,从而有助于提高加工效率和延长刀具寿命。该方法在调制靶金属模板的制备中获得了广泛应用。

Tool trajectory optimizing in ultra-precision turning of multi-mode sinusoidal perturbation surface

This paper aims at optimizing the diamond tool trajectory in ultra-precision machining of perturbation surface with single point diamond turning technology. First, the ultra-precision machining principle of multi-mode sine surface is illustrated. Second, the parallel chord bi-arc interpolating algorithm is theoretically analyzed, of which the interpolating trajectory error expression is obtained. On this basis, the parallel chord bi-arc interpolating algorithm with adaptive step length is introduced for dynamically controlling the interpolating trajectory error. And the interpolation formula is derived. Finally, the new interpolating algorithm is adopted for example analyzing with Matlab software, and is compared with two other algorithms, the linear interpolation and the parallel chord bi-arc interpolation with fixed step length. The simulation results present that the new algorithm can maximally reduce interpolating sections in conditions of trajectory error, which helps to improve the machining efficiency and extend the cutting life span.