1. Interference detection and optimal tool selection in 3- axis NC machining of free-form surfaces D.C.H. Yang*, Z. Han CAD/CAM Laboratory, Department of Mechanical and Aerospace Engineering, University of California, Los Angeles,
5. Phase I: protrusion interference checking Step 1. Sorting critical iso-inclination curves iso-phote P( u , v ) n( u , v ) V = (0, 0, 1), Global interference checking critical iso-inclination curve
6. Step 2. Identifying the visible part of the critical iso-inclination curve Global interference checking Step 3. Determining the PI boundary Phase I: protrusion interference checking
11. Phase I: original interference area determination Local interference checking maximum and minimum normal curvatures k1,2 ,H represents the mean curvature; K , Gaussian curvature
13. Phase II: total interference area determination Local interference checking
14. Optimal tool selection number of tool change is N tc, time required for each tool change is tc, radii of cutters are Ri ( i . 1,…, N tc), . corresponding machining times are ti , length of tool path is Li feed-rate is fi area of machining Ai , cutter radius Ri , scallop height h , size of path interval gi , Si o and Si i be the lengths of the outer and inner boundaries of Ai ,