Title: Research on processing technology of grinding aspheric workpiece in the five-axis machine tool

Authors: Jianfeng Liu; Lin Sun; Changsheng Li; Xingyuan Long; Xudong Fang; Zhaoxiang Chen; Zhuangde Jiang

Addresses: State Key Laboratory of Mechanical Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an, 710049, China ' State Key Laboratory of Mechanical Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an, 710049, China ' State Key Laboratory of Mechanical Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an, 710049, China ' State Key Laboratory of Mechanical Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an, 710049, China ' State Key Laboratory of Mechanical Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an, 710049, China ' State Key Laboratory of Mechanical Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an, 710049, China ' State Key Laboratory of Mechanical Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an, 710049, China

Abstract: Aspheric optical components have been widely used recently because of their unique advantages. Thus, it is necessary to investigate processing technology of such aspheric parts. In this paper, an aspherical mirror is ground with cup wheel in five-axis computer numerical control (CNC) machine tool and corresponding processes were investigated. To improve machining efficiency and reduce tool wear, the workpiece is firstly ground to be a spherical mirror, and then it is ground to be the aspheric contour. The best fitting spherical mathematical equation is derived by the axisymmetric quadratic aspheric generatrix equation. A ∅90 mm aspheric mirror was ground with cup wheel with five-axis computer numerical control (CNC) machine tool. The aspheric curve is processed into a paraboloid shape. The experimental results show that the surface profile of the aspherical lens is consistent with the designed profile, and the peak value (PV) value of the error is 4.77μm. Such results can be accepted in consideration of working allowance for polishing. According to the experimental results, the cause of the error was analysed and methods for improving precision were proposed.

Keywords: five-axis machine tool; cup wheel; aspheric surface; fitting spherical radius.

DOI: 10.1504/IJNM.2020.108044

International Journal of Nanomanufacturing, 2020 Vol.16 No.3, pp.243 - 257

Received: 13 Aug 2018
Accepted: 14 Sep 2018
Published online: 02 Jul 2020 *

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