基于PMAC时基控制的离轴抛物面超精密加工技术  

Ultra-precision machining technology of off-axis paraboloid surface based on PMAC time-based control

作　　者：何坚 郭泽龙 罗松保 李喆 韩海涛 马善意 HE Jian;GUO Ze-long;LUO Song-bao;LI Zhe;HAN Hai-tao;MA Shan-yi(Faculty of Information Technology,Beijing University of Technology,Beijing 100124,China;AVIC Beijing Precision Engineering Institute for Aircraft Industry,Beijing 100076,China)

机构地区：[1]北京工业大学信息学部,北京100124 [2]航空工业北京航空精密机械研究所,北京100076

出　　处：《光学精密工程》2021年第8期1891-1898,共8页Optics and Precision Engineering

基　　金：国家重点研发计划(No.2020YFB2104400)。

摘　　要：为了实现对离轴抛物面等非回转对称、不规则复杂曲面零件的金刚石超精密车削成型。本文提出了一种基于PMAC时基控制的离轴抛物面加工方法。论文首先依据平移旋转方程对工件的坐标进行转换,然后根据时基控制原理计算控制参数,最后通过分析刀具的运动过程进行了工艺试验。实验结果表明,在主轴转速96 r·min^(-1)时,切削深度0.005 mm,刀具进给率1 mm·min^(-1)等切削参数进行加工时,成功地获得面形精度2μm,粗糙度Ra为0.02的离轴抛物面。该方法不仅适用于离轴抛物面的加工,还适用于其它回转对称、不规则的自由曲面的超精密加工。In order to achieve ultra-precision diamond turning of non-rotationally symmetrical,irregular,and complex surfaces such as off-axis paraboloid surfaces,this paper proposes a method for the machining of off-axis paraboloid surfaces using time-based control of a PMAC. This study converts the coordinates of a workpiece based on the translation and rotation equations and then calculates the control parameters based on the time-based control principle. Finally,machining experiments are performed by analyzing the tool motion process. The experimental results show that off-axis paraboloid surfaces with a form error of 2μm and roughness of Ra0. 02 are successfully machined at a spindle speed of 100 r/min,cutting depth0. 005 mm,and feedrate of 1 mm/min. This method applies to not only the machining of off-axis paraboloid surfaces but also the ultra-precision machining of other rotationally symmetrical and irregular free-form surfaces.

关 键 词：离轴抛物面 快速伺服刀架 PMAC 时基控制 

分 类 号：TG519.3[机械工程—精密仪器及机械]