Abrasive tool making process – material – or composition – With carbohydrate or reaction product thereof
Patent
1975-09-22
1977-09-20
Arnold, Donald J.
Abrasive tool making process, material, or composition
With carbohydrate or reaction product thereof
51298R, B24B 100, B24B 3702
Patent
active
040487652
ABSTRACT:
A solid polyurethane polishing and finishing wheel is disclosed having a molded annular matrix reinforced at the inner circumference by a series of axially spaced annular fibrous members embedded in the matrix. The radially outer portion of the matrix is free to deform during use and is formed of a flexible elastomeric polyurethane having a no-grain Shore A durometer hardness from about 30 to about 55 and a high tensile strength. Proper distribution of the abrasive refractory grains is achieved by employing a polyurethane prepolymer having a high viscosity of 2000 to 6000 centipoises at the curing temperature, and the curing agent is selected to provide the required flexibility and tensile strength and also to effect curing rapidly so that the abrasive grains remain in position during curing. The polyurethane composition contains up to 100 parts of finely divided abrasive material, 3 to 20 parts of mica, and up to 10 parts of molybdenum disulfide per 100 parts by weight of the polyurethane prepolymer. The polyurethane polishing and finishing wheels of the present invention have a useful life at least several times that of the flexible wheels previously used and make it commercially practical for the first time to employ such wheels on machines such as O.D. grinders, centerless grinding machines and the like.
REFERENCES:
patent: 2612736 (1952-10-01), Lewis
patent: 3252775 (1966-05-01), Guilbert
patent: 3529945 (1970-09-01), Charvat
patent: 3850589 (1974-11-01), Charvat
patent: 3864101 (1975-02-01), Charvat
Arnold Donald J.
The Manufacturers Brush Company
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