Patent ID: 6062117
Filing Date: 2000-05-16
Classification: B23Q,G05B,Y10T

Abstract:
An apparatus for machining both inside and outside of a workpiece to impart thereto inner and outer surfaces that are contoured to be non-circular in section, comprising:workpiece support means including upper and lower workpiece support members for clamping upper and lower end portions of the workpiece oriented substantially vertically, from opposite upper and lower sides of the workpiece to support the workpiece rotatably about an axis of the workpiece support means extending substantially vertically, said workpiece comprising a plurality of piston rings axially stacked and aligned in a phase position;C-axis drive means for synchronously rotating said upper and lower workpiece support members so as to rotate said workpiece about said axis of said workpiece support means through said upper and lower workpiece support members from both said upper and lower sides of the workpiece;Z-axis drive means for acting on said workpiece support means to move said workpiece in a direction of said axis of said workpiece support means;an exterior machining unit having a first cutting tool arranged to be movable in a direction of an x-axis orthogonal to said workpiece axis, said first cutting tool being positionable to lie outside of said workpiece for shaping an outer surface of said workpiece;an interior machining unit having a second cutting tool arranged to be movable in a direction of a U-axis parallel to said X-axis, said second cutting tool being adapted to be inserted into an inside of said workpiece from an end side of said workpiece for shaping an inner surface of said workpiece; andcontrol means for numerically controlling said C-axis drive means, said exterior machining unit and said interior machining unit so as to independently control movements along said X-axis and said U-axis in synchronism with a rotation about said C-axis.