ボールセンタを用いた精密円筒研削(第1報) : 接触剛性について

概要

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It is customary to support the workpiece with dead-centers in high precision cylindrical grinding. Then the geometrical deviations of cone centers and center holes, and their misalignments have an influence on the roundness of ground surfaces. It is known that the misalignments and geometrical deviations of center holes do not influence the roundness of ground surfaces with the accurate and cheap steel balls in place of cone centers. But few reports concerned about the characteristics of the ball centers were found. In this paper, experiments on the axial and radial stiffness were performed, at the contact parts between balls and center holes. The obtained main results are as follows : (1) The relationships between the elastic deformations and the loads are hysteretic. (2) The axial and radial contact compliances are from 0.002 5 to 0.006 μm/N. In the ball centers, the stiffness is smaller than that of the cone centers, but the variances of stiffness are smaller than these too. (3) The stiffness decreases according to the increase of the circumferential waviness of center holes, and to the decreases of ball diameter and Young's modulus. (4) The ellipsoidal component of center holes decreases the radial contact stiffness remarkably.
公益社団法人精密工学会の論文
1988-12-05