Patent ID: 8103374

Claim:
A processing apparatus for deciding a position of center holes to be bored in a material crankshaft, the processing apparatus comprising: a three-dimensional shape data acquiring section configured to acquire three-dimensional shape data of the material crankshaft; a tentative center-hole position determining section configured to determine a tentative position of the center holes in the material crankshaft based on the three-dimensional shape data; a shape simulating section configured to obtain a simulated shape of the material crankshaft after a predetermined working is simulated for the material crankshaft using the tentative position of the center holes as a reference; a balance deciding section configured to decide whether or not a rotational imbalance amount in the simulated shape of the material crankshaft is within a predetermined allowable range; and a center-hole deciding section configured to decide the tentative position of the center holes as an actual boring position of the center holes when the rotational imbalance amount is within the predetermined allowable range.