| 摘要 |
PROBLEM TO BE SOLVED: To calculate a three-axis machining cutter path of a cube with fixed accuracy and at high speed. SOLUTION: Offset quantity of the cube for a specified tool is decided in the case of machining the cube (S100), all surfaces of the cube are divided into triangles and offset of the triangles is further performed (S101). In addition, all ridge lines of the cube to be machined are divided into straight lines, a cylindrical surface centering around a central axis of the straight segments and with radius of the offset quantity is generated (S102) and sphericity centering around of an end point of the straight line segments by dividing all vertexes and ridge lines and having the radius of the offset quantity is generated (S103). Next, a calculation tool is set at a certain position of the cube to be machined (S104) and contact points between a circle and offset triangles, the cylindrical surface and the sphericity on the bottom surface of the calculation tool are calculated (S105, S106, S107). The cutter path approximated to the fixed accuracy is calculated by repeating calculation from a step (S104) to steps (S106, S107) at a proper position of the cube.
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