Chuck and method for manufacturing same
AssigneeKitagawa Iron Works Co., Ltd.
InventorTamio Nishimiya
Life of this patent
Estimating the term…
Abstract
A chuck includes a plurality of master jaws 20 that slide in the radial direction in the front surface of a body 10 in conjunction with slide of a plunger 40. The body 10 has a housing chamber 11 communicating with a plurality of keyways 13. The plunger 40 is fitted in the housing chamber 11. Each of the master jaws 20 includes a narrower part 21 and a wider part 22 fitted into an associated one of the keyways 13, and a wedge 23 connected to the plunger 40. The wider part 22 has a flat wider sliding surface 22b radially outside the wedge 23. Each of the keyways 13 has a wider slid surface 14.
Claims5
A method of manufacturing a chuck including a body and a plurality of jaws, the plurality of jaws being positioned at a front surface of the body while supporting a workpiece with rotation axes of the chuck and the workpiece coinciding with each other, the chuck comprising:
- a plunger arranged inside the body with a center of the plunger coinciding with the rotation axes and configured to slide in an axial direction;
- and
- a plurality of master jaws each constituting one of the jaws and configured to slide in a radial direction in the front surface of the body in conjunction with the slide of the plunger,
- wherein:
- the body includes:
- a plurality of keyways arranged like rays at equal intervals in the front surface and having a transverse section having a substantially inverted T-shape toward front;
- and
- a housing chamber at a central portion of the body to communicate with the plurality of keyways, the plunger being fitted in the housing chamber,
- each of the master jaws includes:
- a narrower part fitted in a front portion of an associated one of the keyways and exposed to the front surface of the body;
- a wider part fitted in a rear portion of the associated one of the keyways and sliding along the associated one of the keyways;
- and
- a wedge protruding rearward from a radially inner end of the wider part and connected to the plunger,
- the wider part has a flat wider sliding surface in an entire region radially outside the wedge, and each of the keyways has a wider slid surface that comes into surface contact with the wider sliding surface,
- the method includes finishing processing in which the wider sliding surface is processed in a direction orthogonal to a sliding direction of the wider sliding surface,
- the finishing processing makes the wider sliding surface be a smooth surface so that the wider sliding surface has high smoothness that allows the wider sliding surface to be slidable in both of the radial direction and a circumferential direction when the wider sliding surface is in surface contact with the wider slid surface.
Dependencies are inferred from the claim text.