| 摘要 |
<p>PURPOSE:To prevent an overcut state by forming the paths to show the contour of a model recess part for each cut plane based on a grid point when the contour machining data are produced after formation of the grid point and then setting a common hole machining position within the path formed at the most inside part. CONSTITUTION:In CAD/CAM system 10, the cutting machining data DTCL is produced by a tool path producing device 13 based on the shape data DT3 produced by a free curved surface producing means 12. An NC milling machine 1 produces a metallic mold for the product shown by the data DT3 based on the data DTCL. The CPU of the device 13 generates a grid point based on the dividing points forming a model shape and then generates the paths showing the contour of a model recess part for each cutting plane when the contour rough machining data are produced based on the grid point. Then, a common hole machining position is set approximately at the center pat of an area which is enclosed by the most inside path of the model. Thus, it is possible to effective ly prevent an overcutting state and to assure a highly efficient contour machin ing process.</p> |
