| 摘要 |
PROBLEM TO BE SOLVED: To accurately perform processing without making a biased thickness, even though the work is a thin and ring form article. SOLUTION: A ring form work 12 is housed in a faucet form housing 11 grasped by a chuck, the work 12 is squeezed to an inner wall surface 11a by pressing in the rotating center direction by an outer peripheral pressing roller 26, and the work 12 is squeezed to the faucet form housing 11 side by a side surface pressing roll 17. The work 12 is rotated integrally with the chuck by the rotation of a main shaft, and the processing is carried out at the inner side surface of the work 12 opposing to the outer peripheral pressing roller 26 by a processing tool 20.
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