| 摘要 |
A method and apparatus for representing a processed workpiece in perspective with invisible covered edges on the picture screen of a numerically controlled machine tool includes the steps of resolving both the workpiece and the tool into equidistant sections and storing the coordinates of these sections in a RAM. In correspondence to the relative movements of the tool and workpiece determined by the numerical control program, the associated sections of the tool and workpiece are superimposed in an image point memory. With the aid of a simple algorithm the section contour of the workpiece is altered by the superposition is determined, and its coordinates are stored in the RAM. After this process has been completed for all section planes, all sections are successively fed into the image point memory, with succeeding sections offset by several image points in the X and Z directions with respect to the preceding sections. After each superposition, the algorithm is used to determine the resulting outer contour, which is applied to the display. Covered parts of sections lying in the background are not represented on the display, since they lie inside the outer contour determined up to that time. |
