JPS6434650A - Surface grinding method - Google Patents

Abstract

PURPOSE:To make it possible to finish a workpiece to more accurate flatness by moving a grindstone from a position before the starting point of its grinding action to the position before a spot where a finishing dimension is attained, and then to the position of the finishing dimension after once raising the grindstone to release its elastic deformation due to grinding resistance. CONSTITUTION:When a grinding surface of a grindstone comes into contact with a workpiece to begin its cross feeding at a position A before a grinding position, grinding resistance grows abruptly larger to attain its saturated state soon, and when the grindstone is returned to a position C where it leaves the workpiece at the time of its attaining a position B, the grinding resistance becomes nothing to release the grindstone and the workpiece from their elastic deformation. When, in this state, the grindstone is again moved at grinding feed speed from the position C to a position D where the finishing dimension is attained, it begins grinding action at the peripheral edge of the workpiece formed by previous grinding into a recessed shape, end an increase in the grinding resistance thereby becomes slower than that at the first cross feeding, and a short space between the positions B and D makes the grindstone attain the position D before the grinding resistance is saturated. Thus since a grinding process can be finished while the grindstone and the workpiece keep their elastic deformation small, a ground surface can be improved in its flatness.