| 摘要 |
<p>PROBLEM TO BE SOLVED: To apply a stable axial force to a turbine shaft, a rotational member, and a compressor impeller.SOLUTION: A fastening method for actually fastening a compressor impeller that is temporarily fastened to a turbine shaft by shrink fitting to the turbine shaft, comprises: a step (S206) of measuring a rotation angle or a rotation amount and a fastening torque of a fastening member in a process of screwing the fastening member; a step (S216) of identifying a rotation angle at a fastening torque of zero and using the rotation angle as an original point on the basis of a primary function of the rotation angle or the rotation amount indicating the fastening torque and having the fastening torque at a first gradient or a second gradient smaller than the first gradient and the rotation angle or the rotation amount as solutions if a torque gradient is equal to the first gradient and then to the second gradient; and a step (S218) of stopping rotation of the fastening member if a rotation angle from the original point is equal to a set value.</p> |
