An Experimental Study on Mirror Form Grinding of Free-Form Surface by the Use of Coarse Diamond Grinding Wheel

摘要

Mirror grinding of free-form surface was conducted by the use of coarse diamond grinding wheel in this paper. In this new grinding manner, the wheel moving direction is vertical to wheel cutting direction, which is different from traditional plunge grinding and traverse grinding. The aim is to realize mirror form grinding without the polishing with loose abrasive grain and ultra-fine diamond grinding wheel. First, mirror grinding experiment for high-speed steel was undertaken by means of plane grinding to investigate formation of mirror ground surface and identify mirror grinding parameters, then arc-shaped diamond wheel trued by CNC arc-interpolation was employed to realize form grinding of free-form surface whose tool path is controlled by the equal-envelope height on CNC grinder, finally mirror form grinding of free-form surface was carried out with reference to mirror grinding conditions. Experiment results showed that the ductile-mode grinding may be conducted and mirror form grinding of free-form surface can be realized when decreasing wheel-axial-orientation moving speed, whose surface roughness R_a is less than 20 nm.