Chemistry: electrical and wave energy – Apparatus – Electrolytic
Patent
1991-08-27
1993-09-21
Valentine, Donald R.
Chemistry: electrical and wave energy
Apparatus
Electrolytic
204297R, B23H 506, B23H 508
Patent
active
052465551
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE ART
This invention relates to a work bed for a grinding apparatus capable of grinding or polishing metal parts.
BACKGROUND
Where a grinding wheel is rotated to grind or polish a workpiece, the grinding wheel becomes worn as a result of its functioning, or grinding filings enter between grains of the grindstone, as a consequence of which blinding or filling-up occurs, resulting in a lowering of grinding efficiency. Therefore, the grinding operation is discontinued every fixed time, and the surface is shaved by a grindstone tool called a dresser to project the grindstone grains on the surface.
This grindstone operation is generally called dressing. For the dressing of a grinding wheel for precise grinding, a diamond dresser is used. In such a case, it is necessary to pay sufficient attention to setting of a dressing with respect to the grinding wheel so that the surface of the grinding wheel is not excessively shaved, which requires skill.
Dressing by way of discharge is also well known. In either case, the diameter of the grinding wheel is decreased due to the dressing. It is therefore necessary to change the offset amount with respect to a work.
The change of the offset amount of the grinding wheel after dressing is carried out by artificially placing the grinding wheel into contact with the surface to be worked. Confirmation of the contact between the grinding wheel and the surface to be worked is made by listening to an insignificant contact noise at that time or looking at sparks generated by grinding. In view of the foregoing, grinding work accomplished by the grinding wheel requires time as compared with cutting work, drilling work, etc. The decrease in diameter of the grinding wheel due to the wear of the surface is insignificant. The diameter after dressing may be measured by mechanical or electric means. However, it has been difficult to automatically set a new grinding-wheel position on the basis of the measured value.
DISCLOSURE OF THE INVENTION
This invention solves the aforementioned problems with respect to the grinding work by way of the grinding wheel and has been conceived in order to automate grinding work and polishing work similar to the case of other metal work means. An object of this invention is to provide a work bed for a grinding apparatus capable of continuously performing grinding or polishing work, dressing of a grinding wheel and measurement of a diameter of a grinding wheel after dressing, and decision of a set position of a grinding wheel on the basis of the measured value, on one and the same work table.
A further object of this invention is to provide a work bed for a grinding apparatus capable of being applied to a composite working machine which has many work functions such as cutting work by way of a milling machine, drilling work by way of a drill, discharge work, grinding work by way of an electrolytic in process dressing grinding process, etc.
For achieving the aforesaid objects, this invention provides a grinding apparatus comprising means for moving a work table on a machine bed in a direction of X-axis and in a direction of Y-axis, an energizable spindle vertically movably provided upwardly of the work table, and a conductive grinding wheel mounted on the extreme end of the spindle, wherein a conductive dresser member and a measuring reference member are provided on the upper surface of the work table so that operating surfaces thereof are parallel with the X-axis or Y-axis of the work table.
The X-axis and the Y-axis of the work table are set by an X-axis reference member and a Y-axis reference member provided at right angles to each other on the upper surface of the work table, and the conductive dresser member and the measuring reference member are provided on the upper surface of the Y-axis reference member so that operating surfaces thereof are parallel with the X-axis or Y-axis.
The dresser member and the measuring reference member are formed of metal blocks having an electrical conductivity, or formed from a single metal block, as the cas
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patent: 3272732 (1966-09-01), Faulkner
patent: 4641007 (1987-02-01), Lach
patent: 4956056 (1990-09-01), Zubatova et al.
patent: 5108561 (1992-04-01), Kuromatsu
Nissei Plastics Industrial Co. Ltd.
Valentine Donald R.
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