METHOD FOR DRILLING CENTER HOLES IN FORGED ROTORS AND SYSTEM FOR DRILLING CENTER HOLES IN FORGED ROTORS

摘要

The present invention improves the manufacturing productivity and reduces the weight of forged rotors. A preliminary center hole is set for sample forged rotors selected from a single forging lot between a mold-shift adjustment and a subsequent adjustment. A virtual final shape for each of said sample forged rotors is simulated on the assumption that the preliminary center hole is drilled, and the rotational-imbalance amounts of said final shapes are computed. The mean rotational-imbalance amount of all of the sample forged rotors from the same forging lot is computed, and center holes are drilled in all of the forged rotors from said forging lot at the center-hole drilling position that makes the aforementioned mean rotational-imbalance amount zero.