MEASURING METHOD FOR PRECISION OF INNER SURFACE OF THROUGH HOLE AND MANUFACTURE OF BASE USING IT

摘要

PROBLEM TO BE SOLVED: To provide a precision measuring method for the inner surfaces of through holes which evaluates the precision of the inner surface of a through hole of a structure having a through hole such as an extruded base, with a high precision and quantitatively. ;SOLUTION: Scattered lights are emitted to a structure 1 having a through hole using a scattering board 2, and a picture image is obtained by light having passed through the inside of a through hole of a structure 1 using a telecentric optical system 3. And the picture image is analyzed by picture processing technique. Consequently, the precision of the inner surface of the through hole is measured. It is favorable that the structure 1 having a through hole may be a molding base to be used on the occasion of extruding a honeycomb substance, and that the precision of the inner surface of the through hole may be the surface roughness of the inner surface.;COPYRIGHT: (C)2000,JPO