Center support grinding method, center support grinding machine, and centering method for the centers thereof
AssigneeSeiko Instruments Inc.
InventorsKatsura Tomotaki, Yukimasa Nakamura
Life of this patent
Estimating the term…
Abstract
To provide a grinding machine and a centering method for the centers thereof in which the requisite space for the center support rotating mechanism for a workpiece and the in-feed mechanism is reduced to facilitate miniaturization and in which it is easy to secure the space for the supply and discharge of the workpiece and sizing measurement. A motor built-in type main spindle retaining a rotary drive center and a motor built-in type tailstock spindle retaining a tailstock center are swiveled by in-feed means eccentrically supporting them, whereby the rotary drive center and the tailstock center make an in-feed motion with respect to a grinding wheel.
Claims16
A center support grinding method, comprising the step of:
- a cylindrical workpiece being supported by two centers;
- and
- the workpiece being ground while being rotated by the two centers.
A center support grinding method, comprising:
- a rough grinding step for supporting a cylindrical workpiece by two centers and performing rough grinding on the cylindrical workpiece while rotating the workpiece by the two centers;
- and
- a finish grinding step for performing, after the rough grinding step, finish grinding on the workpiece while rotating the workpiece by one center, with the other center being fixed in position.
A center support grinding machine, comprising:
- a main shaft unit;
- a main spindle rotatably retained in the main shaft unit;
- a rotary drive center retained by the main spindle and adapted to be engaged with one center hole of a cylindrical workpiece;
- main spindle rotary drive means built into the main shaft unit and adapted to rotate the main spindle;
- a tailstock unit;
- a tailstock spindle retained in the tailstock unit so as to be slidable in the axial direction;
- a tailstock center retained by the tailstock spindle, arranged so as to be opposed to the rotary drive center in the same axis, and adapted to be engagedwith the other center hole of the cylindrical workpiece to hold the cylindrical workpiece in cooperation with the rotary drive sensor;
- tailstock center urging means for elastically urging the tailstock center toward the rotary drive center side to hold the cylindrical workpiece between the rotary drive center and the tailstock center;
- and
- in-feed means on which the rotary drive center, the main spindle rotary drive means, and the tailstock center are mounted and which moves the rotary drive center, the main spindle rotary drive means, and the tailstock center by a swiveling motion to thereby cause the cylindrical workpiece held between and rotated by the two centers to make an in-feed operation with respect to a grinding wheel.
A centering method comprising:
- centers being respectively mounted to opposing center mounting holes of a pair of spindles arranged in the same axis;
- a cylindrical workpiece being rotated while being held between the centers;
- the centers being respectively mounted to the spindles;
- and
- the centers being ground for centering by a grinding tool while rotating the spindles.
Dependencies are inferred from the claim text.