1994 年 60 巻 2 号 p. 275-279
This paper presents a new generating method of an offset surface on which a milling tool path moves. It consists of three steps; 1. A workpiece and an end-milling tool are represented by 2.5 dimensional lattice space model, enhanced Z-map model. 2. The calculation of a center position of the tool is done through the detection of a nominal cutting point in the geometric simulation. Namely the sum of a height of the workpiece at a lattice point of the XY domain and that of the tool at the same point in scanned at all over the lattice point of the covering area of the tool. This successive locus of the tool center coincides with an offset surface. 3. If a geometric machining error due to a tool path generation is estimated to be over a tolerance, lattice pitches of the XY domain are binary subdivided hierarchically. Then Step 2 is carried out based on the new lattice pitch till the satisfaction of tolerance requirements. Through the comparative simulation with the inverse offset method, the proposed method performed the improvement of processing time and a small memory size. The conclusions are briefly mentioned too.