Abstract
This paper describes composite machining of internal grinding and Hard-turing. Internal grinding of small bore is one of difficult process. Because low rigid quill causes bending by grinding force and makes taper bore. And this force is influenced by condition of grinding wheel and unstable. This bending prevents high tact fine grinding of small bore. In order to keep good accuracy and high grinding efficiency, we reduced stock removal for grinding. Hardening of material makes deformation and required thick stock removals. We added hard turning on internal grinder so that minimize stock removal for grinding. This combined process achieved 30% reduction of total cutting time.
