Patent ID: 6230379
Filing Date: 2001-05-15
Classification: B23Q,B24B,Y10T

Abstract:
A combined apparatus for making piston rings from a workpiece constituted of vertically stacked piston ring workpieces brought and held together, comprising:an interior and exterior working machine operable under synchronous control by an NC unit for machining both inside and outside of the stacked workpiece;a severing machine for severing the stacked workpiece in a direction of a workpiece axis extending substantially vertically; anda common bed,wherein said interior and exterior working machine as a first machine body and said severing machine as a second machine body are mounted adjacent to each other on said common bed, andwherein said interior and exterior working machine comprises:an upper and a lower workpiece support means for jointly clamping the stacked workpiece oriented substantially vertically, from opposite upper and lower sides of the stacked workpiece to support the stacked workpiece rotatably about said axis;a C-axis drive means for driving both said upper and lower workpiece support means synchronously to positively drive both sides of said stacked workjpiece to rotate said stacked workpiece about said axis;an exterior machining means having a first cutting tool arranged to be movable in a direction of an X-axis orthogonal to said workpiece axis for shaping an outer surface of said stacked workpiece;an interior machining means having a second cutting tool arranged to be movable in a direction of a U-axis parallel to said X-axis and adapted to be inserted into the inside of said stacked workpiece from an end side of the stacked workpiece for shaping an inner surface of said stacked workpiece; anda Z-axis drive means for acting on both said upper and lower workpiece support means to move said stacked workpiece in a direction of said workpiece axis.