Importance

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Abstract

A combined machine tool for specific use in making a piston ring or the like from a workpiece is disclosed, in which on a common bed there are mounted: an outer and inner peripheral surface machining unit numerically controlled and having an outer peripheral surface machining section and an inner peripheral surface machining section which are operable together to simultaneously machine an outer peripheral surface and an inner peripheral surface of the workpiece, and a cut-split machining unit adapted to act on the workpiece machined over the outer and inner peripheral surfaces by the outer and inner peripheral surface machining unit, in a manner such as to machine, by cut-splitting, the so machined workpiece while it remains unaltered in position.

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First Claim