Abrasive tool making process – material – or composition – With carbohydrate or reaction product thereof
Patent
1988-09-14
1990-03-06
Schmidt, Frederick R.
Abrasive tool making process, material, or composition
With carbohydrate or reaction product thereof
511658, 5116583, B24B 4900
Patent
active
049054171
ABSTRACT:
In a numerical control grinding machine using a grinding wheel made of cubic boron nitride, a computerized numerical controller controls the infeed movement of a wheel head to effect a rough grinding, a drifty grinding and a fine grinding on a rotating cylindrical workpiece. The drifty grinding due to a spring-back motion which is caused by a flexed workpiece is initiated in response to a sizing signal from a sizing device which measures the workpiece diameter varying momentarily during the grinding operation and is terminated upon the expiration of a predetermined time which is sufficient to vanish the variation of the workpiece diameter. A sizing device measures the actual diameter thereafter, and the sizing signal is compensated in order to approximate the actual diameter to a desired set size which is the sum of a finish diameter and a predetermined allowance for the subsequent fine grinding operation, as the number of the workpieces increases. That is, the numerical controller diminishes a set size which determines the time point to issue the sizing signal from the sizing device, toward the desired set size on a step-by-step basis with the increase in number of the workpieces ground.
REFERENCES:
patent: 4117634 (1978-10-01), Sugita et al.
patent: 4711054 (1987-12-01), Tsujiuchi et al.
Oda Yukio
Wakazono Yoshio
Rachuba M.
Schmidt Frederick R.
Toyoda Koki Kabushiki Kaisha
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