Abrading – Precision device or process - or with condition responsive... – Computer controlled
Reexamination Certificate
2002-08-29
2004-07-27
Rachuba, M. (Department: 3723)
Abrading
Precision device or process - or with condition responsive...
Computer controlled
C451S007000, C451S053000, C451S062000
Reexamination Certificate
active
06767273
ABSTRACT:
FIELD OF THE INVENTION
This invention concerns the grinding of crank pins, especially an improved process of finish grinding such components particularly crankpins of steel crankshafts using a computer controlled grinding machine.
BACKGROUND TO THE INVENTION
For finish grinding the depth of stock to be removed is normally less than 0.5 mm on radius.
Crank pins are traditionally ground using a continuous feed method in which the rotating grinding wheel is fed into the workpiece by advancing the wheelhead, as the workpiece is rotated. The rate of wheel advance is usually decreased as the workpiece approaches finish size, once to size, sparkout using wheel dwell is performed. This normally consists of a few turns of the workpiece whilst the wheelhead (on which the rotating grinding wheel is carried) remains fixed in position relative to the workpiece, with the wheel just grazing the pin.
During the rest of the process, the wheelhead is advanced and retracted under computer control so as to maintain contact between wheel and crankpin as the latter is rotated around the crankshaft axis. The crankshaft is driven by a headstock drive.
REFERENCES:
patent: 4384333 (1983-05-01), Maecker
patent: 4621463 (1986-11-01), Komatsu et al.
patent: 4790698 (1988-12-01), Heffron
patent: 5453037 (1995-09-01), Lehmann
patent: 5919081 (1999-07-01), Hykes et al.
patent: 000903200 (1999-03-01), None
patent: WO98/10891 (1998-03-01), None
Coverdale Stephen Roger
Proctor David Thomas
Thorpe Christopher Shaun
Rachuba M.
Reising, Ethington, Barnes, Kisselle, P.C P.C.
UNOVA UK Limited
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