CHUCK DEVICE, WORKPIECE MACHINING METHOD, MACHINED ARTICLE, MANUFACTURING METHOD OF DRAWN TUBE AND DRAWING TUBE FORMED THEREBY

摘要

PROBLEM TO BE SOLVED: To provide a chuck device by which a workpiece can be firmly chucked at a part to be chucked and by which generation of chips can be suppressed.;SOLUTION: The chuck device 1 is composed of a workpiece inserting part 3 into which a bar-like part 21 to be chucked of the workpiece 20 is inserted and a plurality of chucking jaws 4 which are arranged in an array in the circumferential direction around the workpiece inserting part 3. On the chucking face 4a of each jaw 4, there are installed a plurality of conical biting projections 8 for preventing the workpiece from falling off, in an array in the direction of the axis Q of the workpiece inserting part 3. The apex angle θ of the biting projections 4 is set in the range of 70-130°.;COPYRIGHT: (C)2005,JPO&NCIPI