| 摘要 |
PURPOSE:To improve the efficiency in cutting work for a metal-mold curved-surface by a corner-R end mill by synthesizing and modelling two kinds of cutter shapes of a ball end mill having a radius of (r) and the end mill having a radius of (R-r) and introducing the two-stage offset system. CONSTITUTION:At first, the curved-surface data related to the curved surface 30 to be cut and the interference curved surface 40 for cutter interference processing are read-in and stored into a memory. In the first offset processing part, each curved surface is offset in the direction of normal line by the value (r) of the corner R of a corner-R end mill on the basis of these curved surface data, and the first offset curved surfaces 31 and 41 of the cut curved-surface 30 and the interference curved-surface 40 are formed. Then, in the second offset processing part, the second offset processing is performed, limiting the first offset curved-surface data within the X-Y plane, and the amount of offset is determined to be the radius R1-r of cutter of the end mill. The second offset curved surfaces 32 and 42 of the cut and interference curved-surfaces 30 and 40 are formed in the second offset processing part, and the curved-surface cutting process by the corner-R end mill can be efficiently carried-out by the utilization of the second offset curved-surfaces. |
