| 摘要 |
PROBLEM TO BE SOLVED: To efficiently machine an outer peripheral surface of a cylindrical metal fitting of a small article, having a large inner diameter part on one end side, having a small inner diameter part on the other end side, being thin in the thickness in the large inner diameter part and being thick in the thickness in the small inner diameter part, without replacing a chuck. SOLUTION: A chuck 1 uses a device of arranging a cylindrical chuck body 2 having fitting parts 3 and 4 around which the cylindrical metal fitting 101 is fitted and a rod 30 slidably arranged on the inside. Among the body 2, openings 18 penetrating in the radial direction of a shaft G are arranged in three places in a fitting part of the small inner diameter part 105 of the cylindrical metal fitting 101, and a chuck piece 40 is displaceably arranged in the radial direction of the shaft in the respective openings 18. The cylindrical metal fitting 101 is fitted around the fitting parts 3 and 4, and the rod 30 is slid to the tip side of the body 2, and the chuck piece 40 is pushed outside by the wedge action by a tapered tip part 31 on the tip, and the cylindrical metal fitting 101 is gripped by an inner peripheral surface of the small inner diameter part 105 being thick by its pressing force. COPYRIGHT: (C)2006,JPO&NCIPI
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