To prevent the uneven wear of a grinding wheel, provide good straightness accuracy and allow the grinding of a cylindrical portion of a pin or a journal of a crank shaft capable of being machined with high efficiency and a pair of round portions ranging from a pair of end faces to the cylindrical portion.
This method for grinding the pin portion or the journal portion comprises a first machining step for roughing the pair of end faces of the crank shaft with a first grinding wheel for roughing work, a second machining step of machining the cylindrical portion of the crank shaft with 2 second grinding wheel for finishing work, and a third machining step of finishing the round portion of the crank shaft and the end faces machined in the first machining step with the traverse feed of the second grinding wheel.
MUKAI RYOHEI
KATSUTA MAMORU
