METHOD FOR DRESSING LAPS IN TWO-DISC LAPPING MACHINE TOOLS Russian patent published in 2003 - IPC

FIELD: abrasive working processes, namely lapping high- accuracy plane-parallel surfaces of parts in two-disc lapping machine tools with planetary lapping mechanism. SUBSTANCE: method comprises steps of determining value H_lap and form of out-of-planeness of one of laps (usually lower lap as more comfortable); applying abrasive paste (suspension) with grain size d_a = ( 2 - 3) H_lap on lap surface and uniformly distributing it; mounting at least three dressing tools between laps uniformly along circle in such a way that their continuous surface is turned to side of convex surface of one lap and their annular surface is turned to side of concave surface of other lap; performing cyclic dressing at providing rotation of laps clockwise and counter-clockwise; measuring value of out-of-planeness between cycles; then tilting dressing tool and going on dressing; selecting outer diameter of dressing tool equal to 1.0 - 1.01 of lap width and selecting width of annular surface consisting (0.2 - 0.3) of width of working surface of lap. EFFECT: simplified dressing process, enhanced efficiency, enlarged manufacturing possibilities of method. 6 dwg