| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a collet of a machine tool which inhibits plastic deformation and damage in a state where the collet does not hold a workpiece.SOLUTION: A collet 30 includes: a body part 31 to which a workpiece is fixed; and a deformation restriction ring 52 which restricts deformation of the body part 31. The body part 31 includes a protruding part 31c formed at an outer periphery part of an end surface. The deformation restriction ring 52 includes a contact part 52a disposed at the inner side of the protruding part 31c. The protruding part 31c contacts with the contact part 52a when the body part 31 deforms and a diameter of an area enclosed by the protruding part 31c becomes a predetermined value.</p> |
