摘要 |
PROBLEM TO BE SOLVED: To provide a chuck device holding a thin work while suppressing its elastic deformation. SOLUTION: Chucks 70, 72, 74 hold different portions of a work 12 respectively when gear cutting machining is applied to the inner peripheral face 24 of the thin large-diameter section 22 of the work 12. The chuck 70 firmly holds the small-diameter section 26 of the work 12 with a collet 80, then the chuck 72 holds the large-diameter section 22 of the work 12 with a collet 140 via proper force, and finally the chuck 74 firmly holds the large-diameter section 22 of the work 12. The chuck 72 is kept at the holding state by the elastic force of a compression coil spring 268 applied to a taper member 160 via an action pin 262, thus the holding force is not made excessive. The contact section 290 of the moving contact member 200 of the chuck 74 is kept in contact with the tip face 258 of the work 12 to pinch the large-diameter section 22 from both sides together with a fixed contact member 156, thus the large-diameter section 22 is rarely elastically deformed.
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