Method of forming an abrasive surface including grinding and chemically dressing

Claim 1

A METHOD OF PRODUCING A COARSE, ROUGH OPERATING SURFACE PORTION ON METAL BODIES SUCH AS TOOLS, FRICTION WHEELS, BELT PULLEYS, CLUTCH DISCS AND THE LIKE HAVING AT LEAST AT SAID OPERATING SURFACE PORTION A SURFAC ZONE OF HETEROGENEOUS STRUCTURE INCLUDING A METALLIC MAN COMPONENT HAVING DISTRIBUTED THERETHROUGH AND EMBEDDED THEREIN A PLURALITY OF SHARP-EDGED METAL CARBIDE PARTICLES, THE LATTER TERMINATING IN A COMMON SURFACE PLANE OUTWARDLY SPACED FROM SAID MAIN COMPONENT, COMPRISING THE STEPS OF GRINDING SAID SURFACE PORTION OF A METAL BODY OF SUBSTANTIALLY THE DESIRED SHAPE SO AS TO REMOVE THEREFROM A LAYER HAVING A THICKNESS EQUAL TO ONLY A FRACTION OF THE THICKNESS OF SAID HARDER PARTICLES, THEREBY ALSO REMOVING THE OUTER PORTIONS OF SAID HARDER PARTICLES AND FORMING SHARP EDGES OF THE REMAINDERS OF THE SAME WHICH REMAIN ANCHORED IN SAID METALLIC MAIN COMPONENT OF SAID SURFACE ZONE AND TERMINATE IN THE SURFACE PLANE FORMED BY SAID GRINDING; AND CHEMICALLY SELECTIVELY REMOVING THE UPPER LAYER OF ONLY SAID MAIN COMPONENT OF THE THUS GROUND SURFACE ZONE, SO AS TO FORM AN OPERATING SURFACE PORTION CONSISTING OF SAID SOFTER MAIN COMPONENT AND OF SAID SHARP-EDGED METAL CARBIDE PARTICLES PROJECTING OUTWARDLY FROM SAID SOFTER MAIN COMPONENT AND TERMINATING IN SAID SURFACE PLANE OF SAID OPERATING SURFACE PORTION, WHEREBY DUE TO THE SHARPENING OF SAID HARDER PARTICLES BY SAID GRINDING AND DUE TO THE SUBSEQUENT REMOVAL OF SAID UPPER LAYER OF SAID MAIN COMPONENT A ROUGH OPERATING SURFACE PORTION IS FORMED.

Claim 2

A METHOD OF PRODUCING A COARSE, ROUGH OPERATING SURFACE PORTION ON METAL BODIES SUCH AS TOOLS, FRICTION WHEELS, BELT PULLEYS, CLUTCH DISCS AND THE LIKE HAVING AT LEAST AT SAID OPERATING SURFACE PORTION A SURFAC ZONE OF HETEROGENEOUS STRUCTURE INCLUDING A METALLIC MAN COMPONENT HAVING DISTRIBUTED THERETHROUGH AND EMBEDDED THEREIN A PLURALITY OF SHARP-EDGED METAL CARBIDE PARTICLES, THE LATTER TERMINATING IN A COMMON SURFACE PLANE OUTWARDLY SPACED FROM SAID MAIN COMPONENT, COMPRISING THE STEPS OF GRINDING SAID SURFACE PORTION OF A METAL BODY OF SUBSTANTIALLY THE DESIRED SHAPE SO AS TO REMOVE THEREFROM A LAYER HAVING A THICKNESS EQUAL TO ONLY A FRACTION OF THE THICKNESS OF SAID HARDER PARTICLES, THEREBY ALSO REMOVING THE OUTER PORTIONS OF SAID HARDER PARTICLES AND FORMING SHARP EDGES OF THE REMAINDERS OF THE SAME WHICH REMAIN ANCHORED IN SAID METALLIC MAIN COMPONENT OF SAID SURFACE ZONE AND TERMINATE IN THE SURFACE PLANE FORMED BY SAID GRINDING; AND CHEMICALLY SELECTIVELY REMOVING THE UPPER LAYER OF ONLY SAID MAIN COMPONENT OF THE THUS GROUND SURFACE ZONE, SO AS TO FORM AN OPERATING SURFACE PORTION CONSISTING OF SAID SOFTER MAIN COMPONENT AND OF SAID SHARP-EDGED METAL CARBIDE PARTICLES PROJECTING OUTWARDLY FROM SAID SOFTER MAIN COMPONENT AND TERMINATING IN SAID SURFACE PLANE OF SAID OPERATING SURFACE PORTION, WHEREBY DUE TO THE SHARPENING OF SAID HARDER PARTICLES BY SAID GRINDING AND DUE TO THE SUBSEQUENT REMOVAL OF SAID UPPER LAYER OF SAID MAIN COMPONENT A ROUGH OPERATING SURFACE PORTION IS FORMED.