Abrasive grinding wheels

Details Abrasive grinding wheels Abrasive grinding wheels

1996-01-26

1997-12-09

Rose, Robert A.

Abrading

Rigid tool

Rotary cylinder

451544, 451541, 451542, 125 15, B23F 2103

Patent

active

056953941

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to abrasive grinding wheels, and more precisely to the abrasive grinding wheels with an organic binder, which are employed especially for sharpening, grinding, surfacing, burring or, more generally, the usual different types of machining.


DISCUSSION OF THE BACKGROUND

There are known abrasive grinding wheels consisting of abrasive particles embedded in a matrix based on an organic resin, for example of the phenolic or polyimide resin type. To impart good mechanical behavior to these grinding wheels, the matrix is generally reinforced by means of glass fibers. During grinding operations, the heating of the grinding wheel due to friction can cause the degradation of the organic resin which, at least at the surface, is no longer capable of retaining the abrasive particles. The diameter of the grinding wheel thus decreases little by little until the grinding wheel needs to be replaced.


SUMMARY OF THE INVENTION

The objective of the present invention is abrasive grinding wheels with an organic binder whose life-time is improved.
The subject of the invention is an abrasive grinding wheel including abrasive particles embedded in an organic binder and which additionally comprises a reinforcement in the form of metal fibres.
Bearing in mind their slightly higher cost, metal fibres can be employed together with traditional reinforcing fibres such as glass fibres. On the one hand, the metal reinforcing fibres advantageously replace the glass fibres and impart markedly improved mechanical properties at an equivalent quantity of fibres. On the other hand, this type of reinforcement is a good heat conductor, and this permits good dissipation of heat over the whole volume of the grinding wheel and thus decreases the risks of degradation of the organic substance. Advantageously, furthermore, the electrically conductive nature of the metal reinforcement enables the wear of the wheel to be checked by means of contactless sensors.


DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The metal fibres preferably have the following size characteristics: a length of 5 to 10 mm, preferably from 10 to 20 mm. They are advantageously chosen in the form of ribbons which have, in particular, a width of 0.5 to 7 mm, especially from 1 to 5 mm, and a thickness of less than 5/10th of mm, especially of the order of 2 to 3/10th of mm.
These metal fibres or ribbons may be advantageously chosen as metal "glass". This term denotes a metallic material solidified in the vitreous state, which can be obtained especially by a process called hyperquenching. For further details on this technique reference may be made especially to patent FR-2 486 838, corresponding to US patents U.S. Pat. No. 4,520,859 and U.S. Pat. No. 4,562,877. It involves, in fact, abruptly cooling a jet of molten metal leaving an ejection orifice above which there is a band travelling at high speed. Opposite one of the faces of the said band and in the vicinity of the region of impact of the metal or of the alloy or of the molten metal there is at least one caisson comprising at least one ejection orifice for a fluid under pressure, preferably at low temperature, thus creating a fluid cushion between the caisson and the band which maintains the latter frictionlessly on the caisson. When the molten metal or alloy comes into contact with the band it undergoes what is called hyperquenching and it solidifies to form a metal ribbon in the vitreous state.
These amorphous metal ribbons have rather advantageous properties: they are especially particularly ductile and "flexible" while being particularly strong mechanically. Any other quenching process enabling such metal "glasses" to be obtained may, of course, be employed.
The metal glasses employed within the scope of the invention may be based on alloys of the A.sub.n B.sub.1-x type where A consists of one or more transition metals (Fe, Cr, Ni, Mn, Co, etc.) and B of one or more metalloids (F, C, Si, B, etc.) and where x, which is the atomic fraction of A, may be especially of the

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patent: 4350497 (1982-09-01), Ogman
patent: 5411010 (1995-05-01), Mummenhoff
Japanes Patent Abstract No. 664, Oct. 1986.
Japanese Patent Abstract No. 216, Aug. 1991.
Japanese Patent Abstract No. 273, Jan. 1988.
Sandpaper Options by Jeanne Huber, Apr. 1996.

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