Abrading – Precision device or process - or with condition responsive... – With indicating
Patent
1997-02-14
1998-09-29
Eley, Timothy V.
Abrading
Precision device or process - or with condition responsive...
With indicating
451 62, 451228, 451252, B24B 4900, B24B 5100
Patent
active
058139001
DESCRIPTION:
BRIEF SUMMARY
This invention is concerned with a grinding machine for use in grinding workpieces to a desired shape. Such a grinding machine may be used, for example, in grinding a cast cam blank to its final shape.
One known grinding machine comprises a grinding wheel having an abrasive circumferential surface arranged to remove material from a workpiece when the grinding wheel is applied thereto, rotating means operable to rotate the grinding wheel about a central axis thereof, a workpiece support arranged to support a workpiece so that the workpiece can turn about an axis of the support, turning means operable to turn a workpiece on said support about the axis of the support to present different parts of the surface of the workpiece to the grinding wheel, orientation detecting means operable to detect the orientation of the workpiece on the support, moving means operable to bring about relative movement between the workpiece support and the grinding wheel, and control means operable to control the operations of the turning means and of the moving means in accordance with signals received from the orientation detecting means so that the workpiece is ground to a desired shape.
The moving means may be arranged to move the workpiece support arcuately about an axis of the machine to bring about said relative movement. Said axis of the machine is parallel to the axis of the grinding wheel and off-set therefrom. This type of moving means is relatively simple and the workpiece support can be positioned with considerable accuracy. However, the use of such a moving means can lead to inaccuracies in the shape ground because the arcuate movement of the workpiece support alters the point of contact of the workpiece on the grinding wheel relative to what it would be if the movement were linear. Thus, there is a discrepancy between the output of the orientation detecting means and the position on the workpiece on which the grinding wheel is acting. This discrepancy can be taken into account by requiring the control means to calculate a correction but either a complex and expensive control means has to be provided or productivity is lost due to slower grinding to allow time for the calculations to be made.
It is an object of the present invention to provide a grinding machine in which the aforementioned discrepancy is taken into account without requiring calculations by the control means of the machine.
The invention provides a grinding machine comprising a grinding wheel having an abrasive circumferential surface arranged to remove material from a workpiece when the grinding wheel is applied thereto, rotating means operable to rotate the grinding wheel about a central axis thereof, a workpiece support arranged to support a workpiece so that the workpiece can turn about an axis of the support, turning means operable to turn a workpiece on said support about the axis of the support to present different parts of the surface of the workpiece to the grinding wheel, orientation detecting means operable to detect the orientation of the workpiece on the support, moving means operable to bring about relative movement between the workpiece support and the grinding wheel, the moving means being arranged to move the workpiece support arcuately about an axis of the machine to bring about said relative movement, and control means operable to control the operations of the turning means and of the moving means, in accordance with signals received from the orientation detecting means, so that the workpiece is ground to a desired shape, characterised in that the machine also comprises correcting means operable, in response to the operation of the moving means, to cause the output of the orientation detecting means to be altered to compensate, at least substantially, for angular alterations in the point of contact between the workpiece and the grinding wheel caused by the arcuate movement of the workpiece support.
In a grinding machine in accordance with the invention, the aforementioned discrepancy is taken into account in the output of orientation
REFERENCES:
patent: 2247228 (1941-06-01), Flygare
patent: 4468892 (1984-09-01), Giebmanns
patent: 4527356 (1985-07-01), Ozone et al.
patent: 4885874 (1989-12-01), Wedeniwski
patent: 4928437 (1990-05-01), Waelti
patent: 5027562 (1991-07-01), Kobayashi et al.
patent: 5697831 (1997-12-01), Reichel
Banks Derris H.
Eley Timothy V.
T&N Technology Ltd.
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