Patent ID: 6988933

Claim:
A truing method of truing a grinding surface of a rotating grinding wheel with a rotating truing roll by moving the truing roll and the grinding wheel relatively in first and second directions crossing with each other in a grinding machine wherein a wheel head rotatably carrying the grinding wheel and a work head rotatably carrying a workpiece are relatively moved to grind the workpiece with the grinding wheel, the truing method comprising the steps of: inferring a truing shape from which the grinding surface having been trued with the grinding wheel being rotated at a low rotational speed during a truing operation is deformed to a desired shape due to centrifugal expansion depending on a rotational speed difference when the grinding wheel is rotated at a high rotational speed during a grinding operation; preparing a truing NC program which is programmed to rotate the grinding wheel at the low rotational speed and to relatively move the grinding wheel and the truing roll along the truing shape; and executing the truing NC program to rotate the grinding wheel at the low rotational speed and to move the grinding wheel and the truing roll relatively so that the grinding surface is trued with the truing roll.