ULTRA-PRECISION WORKING MACHINE FOR SPHERICAL MIRROR-FNISH COMPONENT

摘要

PROBLEM TO BE SOLVED: To work the deep recess surface of a dent with a high accuracy by forming spherically the polishing part of a grinding wheel, and arranging the grinding wheel axis at a certain angle to the Z-axis. ;SOLUTION: A spherical grinding wheel 3a having a radius (r) is rotated in the direction of arrow A round an axis inclined α deg. To make identical the normal of a free curved surface at the polishing point with the normal of the grinding wheel 3a, the grinding wheel should be moved from the center P₀(X₀, Z_0+r) of the grinding wheel 3a to the point P_n(X_n+rsinθ_n) in case the normal intersects Z-axis with θ_n at the point K_n on the free curved surface f(x), where X_n and Z_n coordinates of the working point on the section of free curved surface and can be determined from the formula Z=f(x). The normal angle to the Z-axis is determined for the working point selected in this manner, and the polishing is conducted as following the locus of the grinding wheel 3a center which is moving bit by bit.;COPYRIGHT: (C)1997,JPO