单点金刚石超精密车削快点火靶丸微孔精度控制

Accuracy control of capsule micro holes in fast ignition based on single point diamond turning

研究了单点金刚石超精密车削技术(SPDT)加工靶丸微孔中的精度控制方法,建立了靶丸微孔加工误差的仿真模型,并理论分析了不同误差因素对微孔尺寸误差的影响规律;根据误差分析结果提出了基于刀具阶梯进给运动方式的微孔精度控制方法,用以控制靶丸微孔精度;在单点金刚石超精密车床上进行了辉光放电聚合物(GDP)靶丸微孔的车削实验,实验结果表明:采用该精度控制方法,靶丸微孔尺寸误差和圆度误差分别降低了70.7%和87.5%,实验结果表明了所提出方法的有效性。

This paper aims at the accuracy control method in the machining of capsule micro holes with single point diamond turning technology. Firstly, a error model of capsule micro holes machining is established and the effect of each error component on micro holes dimension accuracy is theoretically analyzed. Secondly, according to the error analysis results, an accuracy control method is introduced, in which diamond tool step feeding method is adopted for micro holes accuracy control. Finally, GDP cap- sule micro holes machining experiments are carried out on ultra-precision machine. According to the results, the dimension error and roundness error of micro hole reduce 70.7 % and 87.5 % separately, which verifies the validity of the accuracy control method in this paper.