Title: Method for improving surface finish of workpieces ground with abrasive wheels

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Claims: I claim:

1. In a method for grinding metal workpieces on a high speed grinding machine by abrading with a rigid bonded grinding wheel with a predetermined abrading property, the grinding being performed by infeeding the grinding wheel into the workpiece so that material is continuously removed from the workpiece by the contact of grinding wheel, the improvement comprising the subsequent steps of applying to the rotating surface of said grinding wheel, during sparkout while said wheel is rotating at the normal grinding speed, a lapping composition comprising a multiplicity of abrasive crystals having an abrading property different from said grinding wheel dispersed in a normally solid friction-meltable organic polymeric matrix whereby the matrix is melted and the crystals and melted polymer are spread on the surface of the wheel as a lapping layer, and applying said layer against said workpiece until the desired surface finish is achieved.

2. A method as defined in claim 1 wherein said grinding wheel is a diamond grinding wheel.

3. A method as defined in claim 1 wherein said grinding wheel is a cubic boron nitride grinding wheel.

4. A method as defined in claim 1 wherein said abrasive crystals are aluminum oxide crystals or silicon carbide crystals.

5. A method as defined in claim 4 wherein said crystals range from 10 to 100 microns in size.

6. A method as defined in claim 1 wherein said organic polymeric matrix comprises a polyethylene glycol.

7. A method as defined in claim 6 wherein said polyethylene glycol has a molecular weight of about 1300 to 1600 and a melting point of about 35.degree. to 46.degree. C.

8. A method as defined in claim 1 wherein said lapping composition comprises a multiplicity of 25 micron aluminum oxide crystals dispersed in a polyethylene glycol having a molecular weight in the range of 1300-1600 and a melting point of about 38.degree. to 40.degree. C., the mix ratio of aluminum oxide to polyethylene glycol being 0.4 to 1.5 g./ml.

9. A method as defined in claim 1 including the final step, after lapping is complete, of rinsing the lapping composition off the surface of the grinding wheel with grinding fluid or water whereby the wheel is returned to its original grinding configuration.

10. A method as defined in claim 1 wherein said lapping composition is in the form of a stick adapted to be held in the hand and applied against said moving wheel.

Other info:

Inventors: Bonnice, Phillip E. (Worthington, OH, US)

Application Number: 535017
Filing Date: 1974-12-20
Publication_date: 1976-11-09
Assignee: General Electric Company (Columbus, OH)
Primary Class(es): 451/56 125/11.03, 451/58
Other Classes:
US Patent Ref:

2332992	Oct, 1943	Davis	51/263.
2681274	Jun, 1954	Young	51/305.
2904419	Sep, 1959	Couch	51/295.
3314410	Apr, 1967	Knauer	125/11.

Other Refs:
Primary Examiner: Whitehead, Harold D.
Assistant Examiner:
Attorney: Pine; Granville M., Hedman; Edward A., Voss; Donald J.