Grinding wheel

Details Grinding wheel Grinding wheel

1999-12-21

2001-09-04

Eley, Timothy V. (Department: 3723)

Abrading

Rigid tool

Rotary cylinder

Reexamination Certificate

active

06283845

ABSTRACT:

BACKGROUND OF THE INVENTION
The invention concerns a grinding wheel comprising a carrier wheel and a grinding layer arranged on the periphery of the carrier wheel. The grinding layer has a plurality of openings distributed over the periphery. The invention further concerns a grinding apparatus having a device for the feed of a coolant and/or lubricant.
Grinding wheels are already known in which segments provided with abrasive grain are mounted, for example by adhesive means, on the periphery of the grinding wheel. It is also already known that those segments can be arranged so as to be spaced apart from each other, and that liquid coolant and/or lubricant can be fed into the openings which are formed between the segments.
SUMMARY OF THE INVENTION
The object of the invention is to improve the known grinding wheels, in particular in regard to improved grinding qualities and a greater service life. This object is achieved by providing openings that are of a cup-shaped or scoop-shaped configuration (in a radial view) on the periphery of the grinding wheel.
In the state of the art, in a radial view of the periphery of the grinding wheel, the openings extend straight throughout the entire width of the grinding wheel, in a transverse relationship to the peripheral direction. However, the openings according to the present invention are of a cup-shaped or scoop-shaped configuration, that is to say they are delimited on both sides at least over a certain region thereof, so that the coolant and/or lubricant which is fed into the grinding region is retained in the transverse direction and thus enjoys enhanced residence in the grinding zone. That, however, does not necessarily mean that the openings have to be closed towards the peripheral edge of the grinding wheel. The openings may extend as far as the lateral periphery of the grinding wheel, that is to say they may be open towards the side. Nonetheless, cup-shaped or scoop-shaped configurations for the opening are formed, preferably by openings which are of a substantially V-shaped or U-shaped configuration. Whether laterally open or closed openings are employed and how wide the lateral apertures of those openings are, can be selected from the nature of the coolant feed, the amount of coolant and/or lubricant and the feed pressure.
Substantially V-shaped or U-shaped openings of that kind also make it possible to achieve an additional effect. Specifically, these openings guide coolant and/or lubricant from the peripheral edge of the grinding wheel towards the center (that is to say towards the tip of the V or towards the apex of the U). It is also possible for a plurality of V's and U's to be arranged in a row in side-by-side relationship so as to provide an overall, for example, serrated shape with respect to the openings. That therefore involves a hydrodynamic pressure build-up. Such grinding wheels with V-shaped or U-shaped openings which are distributed over the periphery thereof are generally linked to a direction of rotation, that is to say, the desired effect can only be achieved in one direction of rotation, more specifically, the direction in which the open end of the V or the U is moved in a forward direction and the closed end is at the rearmost position with respect to the direction of rotation of the grinding wheel. The applicants' tests have shown that such an arrangement actually makes it possible to achieve substantial improvements. For example, a lower level of power consumption, lower grinding forces (in particular normal forces), a cleaner ground finish without burn spots due to improved dissipation of heat, and the possibility of adopting higher feed values can be achieved. Contrasting tests in which the identical grinding wheel was operated in the reverse direction of rotation exhibited substantially worse results and, thus, indirectly confirmed the effect in accordance with the invention with substantially V-shaped or U-shaped openings, with such effect being linked to the direction of rotation involved.


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