To improve machining accuracy of non-axisymmetric lens, this paper presents the grinding mode with equal arc length feeding in parallel grinding, and analyses the relations between machining error and machining step in both equal length mode and equal arc length mode. For the same purpose, this paper also discusses the calculation of 2-axis machining path compared with 3-axis machining. Finally, the calculation and simulation of machining path are carried out to guide practical grinding.
According to the requirement of high precision non-axisymmetric aspheric surface machining, and analyzing the locus planning limitation of traditional aspheric machining, a set of machining locus planning methods has been put forward to meet the requirement of non-axisymmetric aspheric machining. The method can minish the average and maximum value of residual error in divided area. Experiment result shows that the new machining method can fit ideal locus more, can minish machining error and improve machining accuracy more. It can get stable accuracy when the machining parameters are fixed.