Abstract
An arc envelope grinding method for non-axisymmetric aspheric surface was proposed in order to achieve the mould core used for the precision injection molding of optic reflector. In grinding, the arc-shaped diamond grinding wheel trued on CNC grinder was used to envelope workpiece and generate curve surface, and the spacing distance between tool paths is controlled by the equal-envelope height between wheel and workpiece. In this paper, arc envelope grinding principle was investigated in connection with wheel coordinate calculation and tool path number. The theoretical analysis and grinding experiment showed that arc envelope grinding may improve form grinding efficiency especially for large curvature and smoothness of ground surface and a smooth curve surface can be produced when the equal-envelope height is less than a certain value.
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