A method of machining center holes of a forged rotary body and system of machining center holes of a forged rotary body

摘要

A method of machining center holes in a forged rotary body made using a forging die assembly comprising: a batch assembling step of assembling a plurality of the forged rotary bodies forged within a period after a die misalignment adjustment for the forging die assembly to a next die misalignment adjustment for the forging die assembly, as an equal one of a series of forging blanks; a step of measuring a three-dimensional shape, wherein two or more of the forged rotating bodies are sampled from each of the forging lots and a three-dimensional shape of each of the samples is measured to obtain measurement data of a three-dimensional shape as a result of the measurement; a step of setting temporary center hole positions for setting temporary center hole positions for each of the samples based on the measurement data of a three-dimensional shape; an imbalance amount calculating step for calculating a rotational imbalance amount in a final shape of each of the samples after being subjected to a simulation of a specific machining based on the temporary center holes, based on the measurement data of a three-dimensional shape of each of the samples and design data of a three-dimensional shape of a predetermined design final shape of the forged rotary body; a determination step of determining whether or not the rotational imbalance amount in each of the samples falls within a predetermined allowable range; an average calculation step of calculating an average value of the rotational imbalance amounts in all the samples of the blacksmithing lot for each of the forging lots at which the rotational imbalance amounts for all the samples are determined within the allowable range; a step of setting training positions for center holes for calculating center hole positions that become an average value of the rotational imbalance amounts to zero, and setting the calculated center hole positions as training positions for center holes for all the forged rotary bodies included in the forging lot to those in the calculation used samples include; and during the machining of a certain forged rotary body, a machining step for center holes for machining center holes in the particular forged rotary body at the center hole formation positions set for one of the blacksmiths to which the particular forged rotary body belongs.