PRECISION MACHINING BY FEEDBACK OF SHAPE DATA(1ST REPORT) -THE BASIC CONCEPT AND EXAMPLES OF CORRECTIVE MACHINING-

摘要

Since industrial products have become higher in performance and finer in size, machining with higher accuracy is required. On the other hand, a high accuracy positioning system has been realized by feedback the position data of a controlled object. In this report, the authors propose a concept of a new ,machining system with feedback of shape as in positioning with displacement feedback .To fabricate products with high accuracy, the authors have developed a simple and flexible method for an on-the-machine measurement system by a calibration with geometrical solids. The authors have also developed a metal surface modification method using a green compact electrode of tungsten carbide powder by EDM in hydrocarbon oil. This process is realized on the same machine under the process of removal EDM and accretion EDM. The use two techniques are combined in order to implement the precision machining system by feedback of shape data. Some examples of machining by this system are described. The machining accuracy of ±20μm can be obtained for both flat and 2-dimensional shapes by using the proposed system.