Abstract
A new specular reflection measuring device by means of a concentric distribution optical fiber bundle is developed to measure automatically specular reflection of a small area from the polished free-form metal surface of a mold cavity and data processing system is also developed by using a microcomputer AIDACS-3000 E. The automatic specular reflection measuring device which enables us to estimate the degree of surface integrity of a mold cavity has the following properties : (1) The optical fiber bundle put into the scanning probe is rotated around the two axes. One is the main spindle axis of the NC milling machine and the other is perpendicular to the machine spindle axis. Rotation around the perpendicular axis is converted into reciprocating motion. The specular reflection of the free-form metal surface can be measured easily by these two axes rotation mechanism. (2) The degree of surface integrity of the free-form metal surface can be estimated in the three grades of surface roughness of under 0.1 μmRmax, about 0.4 μmRmax and over 1 μmRmax. (3) After the free-form metal surface is finished by NC milling machine, the specular reflection measuring device is put on the spindle of the same machine and the surface integrity can be estimated directly on the machine.
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