Patent ID: 6134763
Filing Date: 2000-10-24
Classification: B23Q,Y10T

Abstract:
A combined machining apparatus adapted for use in making a piston ring from a workpiece, said combined machining apparatus comprising:a workpiece support for clamping the workpiece in a predetermined position on a bed;said workpiece support comprising an upper clamp head and a lower clamp head for vertically clamping the workpiece to be rotatable about a longitudinal axis thereof oriented substantially vertically;a peripheral machining unit mounted on the bed, said peripheral machining unit being numerically controlled and including 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 clamped in the predetermined position;a cut-split machining unit mounted on the bed and adapted to act on the machined workpiece so as to further machine, by cut-splitting, the machined workpiece while the machined workpiece remains in the predetermined position, without being unclamped from the workpiece support;a C-axis drive adapted to be numerically controlled for rotating said workpiece about a C-axis corresponding to said longitudinal axis of the workpiece; anda Z-axis drive adapted to be numerically controlled for moving said workpiece in a direction of said longitudinal axis;said outer peripheral surface machining section of said peripheral machining unit being arranged to be movable in a direction of an X-axis extending orthogonal to the longitudinal axis of said workpiece, and to be operable with a first cutting tool adapted to be numerically controlled to operate in synchronism with said C-axis drive for machining the outer peripheral surface of said workpiece; andsaid inner peripheral surface machining section of said peripheral machining unit being arranged to be movable in a direction of a U-axis extending parallel to said X-axis, and to be operable with a second cutting tool adapted to be inserted from an end side of said workpiece and to be numerically controlled to operate in synchronism with said C-axis drive for machining the inner peripheral surface of said workpiece.