Method for making depressed center abrasive wheels

Details Method for making depressed center abrasive wheels Method for making depressed center abrasive wheels

1996-07-16

2001-02-27

Derrington, James (Department: 1731)

Abrasive tool making process, material, or composition

Laminating

C051S298000, C264S119000, C264S120000

Reexamination Certificate

active

06193771

ABSTRACT:

BACKGROUND OF THE INVENTION
(1) Field of the Invention
The present invention relates to an improved method of manufacturing depressed center abrasive wheels having a thickness of less than three thirty seconds ({fraction (3/32)}) of an inch. Such wheels are called type 27 cut off wheels.
(2) Description of Prior Art
Depressed center type 27 cutting wheels are currently manufactured by a process that provides for layers of grit or grain in a resin mixture with fiberglass reinforcement mats provided in a cavity having the general profile of the final depressed center shape of the wheel. After such lay-up is prepared in the cavity, the lay-up is compressed so that the center and outer portions of the wheel must be successively formed to provide a depressed center wheel in the “green” state.
A stack of like wheels are then provided between metal plates for transfer to an oven to cure the “green” wheels.
Depressed center resin-type cutting wheels of this general character have been restricted in thickness because this pressing operation of forming a depressed center wheel in the “green” state, causes the resin mixtures and the fiberglass to be pulled toward the center of the wheel, causing the wheel to lose total uniformity or homogeneity throughout the lay-up. This problem has resulted in the thickness of such type 27 depressed center cutting wheels being limited to more than three thirty-seconds of an inch in thickness. Depressed center wheels of less than {fraction (3/32)} of an inch are adversely affected by this conventional process of making such wheels. The present invention relates to fulfilling the need for type 27 depressed center resin-type wheels of less than {fraction (3/32)} of an inch in thickness.
SUMMARY OF THE INVENTION
It is a general purpose and object of the present invention to provide an improved method for fabricating type 27 depressed center abrasive cutting wheels having a thickness of less than {fraction (3/32)} of an inch. The process to be described provides a type 27 depressed center cutting wheel that does not suffer from the disadvantage of non-uniformity in its lay-up either in the “green” state or in the cured state of the final wheel.
This object is accomplished with the present invention by providing a generally flat wheel cavity in a press, and providing a lay-up of abrasive grains and resin together with suitable reinforcing mats in a flat wheel cavity of said press, followed by compressing such lay-up between parallel cavity surfaces to provide a relatively thin flat “green” wheel.
The relatively thin flat “green” wheel is then provided in a fixture which clamps the flat wheel between non-parallel plates, each plate having a depressed center portion, so that the thin, flat “green” wheel is “formed” into a wheel with a depressed center portion while in the “green state”. The wheel is then subjected to the necessary heating for curing the resin, and a relatively thin abrasive wheel of less than {fraction (3/32)} of an inch in thickness is provided with a depressed center portion. Such a wheel has the same desired uniformity throughout, such as now only available in thicker wheels of this type 27 depressed center geometry.


REFERENCES:
patent: 2656654 (1953-10-01), Erickson
patent: 2745224 (1956-05-01), Erickson
patent: 3836345 (1974-09-01), Graham
patent: 4615151 (1986-10-01), Huber

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