センタとセンタ穴の形状が工作物の回転精度に及ぼす影響

概要

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In this paper we show the relationship between the rotation accuracy of the workpiece supported on two dead centers and the cross-sectional shapes of the center and the center hole theoretically, using a contact model of the center and the center hole. Some experiments were conducted in order to check this geometrical model. The main results obtained are as follows. Each harmonic component of the workpiece center hole is transmitted to the rotation error with magnification rates dependent on the locations of the contact points. If the profile of the center is ellipsoidal, or if the centers are misaligned, the center comes in contact with the center hole at two points. Then the even harmonic components of the center hole have little effect on the rotation accuracy. However, the odd harmonic components have a strong effect. When the center is in contact with the center hole at three points, the ellipsoidal component is transmitted strongly to the rotation error. The magnification factors of every component are changed during grinding because the center displacement by the grinding force moves the contact points. Therefore, no definite correlation between out-of-roundness of the center hole and the ground surface in cylindrical grinding can be obtained.
一般社団法人日本機械学会の論文
1994-05-25