Method and device for fine machining bore hole in valve seat involves using honing tool to fine machine not only bore hole but also the ring surface around the edge

摘要

The fine machining is carried out by honing not only the bore hole but also the ring face which is formed at the edge thereof. The bore hole is pre-honed in a first spindle and then the ring face is honed in a second spindle and finally the bore is finished off in a third spindle. Independent claim describes device for fine machining the ring face round the edge of the bore comprising a hollow cylindrical tool body (14) with rotary drive for inserting into bore hole. Inside the tool body is a push rod (20) movable axially to and fro by a further drive and having at free end a pressure member with lining (16) with grinding material.