Machining method of difficult-to-machine material and machining tool therefor

摘要

The invention provides a novel machining tool suitable for machining, e.g., lathing, of a workpiece made from a difficult-to-machine material such as fully sintered ceramics and quench-hardened high-chromium cast irons. The machining tool has a conically pointed cutting chip of a cemented metal carbide and provided with a round-bottom groove of a 0.2-0.5 mm radius of curvature running with an inclination angle of 15-60° relative to the cutting face of the chip. The invention also provides a machining method for a workpiece of a difficult-to-machine material by using the above-mentioned machining tool, in which ultrasonic vibrations are applied to the tool in the cutting direction so that abrasive wearing of the flank surface can be decreased.