Bulb grinding processing method and device of ball pin

The invention relates to a bulb grinding processing method and device of a ball pin. By means of the method, a sand wheel is used for performing grinding processing on the ball pin, wherein the radius of a concave arc-shaped contour line of the sand wheel is the same as the radius of the ball pin to be processed. The device comprises a worpiecce shaft, a sand wheel shaft and a feeding driving mechanism, wherein the workpiece shaft rotates around the axis of the workpiece shaft and is used for installing the ball pin to be processed, the sand wheel shaft rotates around the axis of the sand wheel shaft and is used for installing a sand wheel for grinding, and the feeding driving mechanism is used for driving the workpiece shaft and the sand wheel shaft to move toward the same direction of the opposite direction and has a grinding processing state and a waiting state; and the sand wheel is a rotary body and rotates around a sand wheel axis for a round with a concave arc line as the busbar, wherein the radius of