Abrasive machining uses hard non-metallic particles to cut the workpiece. Processes within this group include grinding, honing, superfinishing, or abrasive belt machining and lapping. The first three use abrasive particles (often called grits), rigidly held in a wheel, stone or belt, whereas in lapping the particles are contained in a fluid. Unlike most other major machining operations this group of processes can shape workpieces harder than 400 Vickers Hardness Number (HV). Abrasive machining produces smooth surface finishes and enables close control to be maintained over the amount of workpiece material removed; in consequence it is mainly used for finishing operations.
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