HE Jian,GUO Ze-long,LUO Song-bao,et al.Ultra-precision machining technology of off-axis paraboloid surface based on PMAC time-based control[J].Optics and Precision Engineering,2021,29(08):1891-1898.
HE Jian,GUO Ze-long,LUO Song-bao,et al.Ultra-precision machining technology of off-axis paraboloid surface based on PMAC time-based control[J].Optics and Precision Engineering,2021,29(08):1891-1898. DOI: 10.37188/OPE.20212908.1891.
Ultra-precision machining technology of off-axis paraboloid surface based on PMAC time-based control
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 2 µm and roughness of
R
a
0.02 are successfully machined at a spindle speed of 100 r/min, cutting depth 0.005 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.
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