An Efficient Trimming Algorithm of Free Form Surface and Its Application in Die CAD/CAM

An efficient trimming algorithm of free form surface is put forward based on a rapid and self contained intersection algorithm of free form surface. The topology relationship is taken into account in the trimming algorithm comprehensively. Thus, the intersection curves within the trimming objects are trimmed, and then the inner and outer loops are connected into accurate trimmed surface. The algorithm validity is also validated by several examples and its application in die CAD/CAM is discussed in detailed. Finally, the processing areas of separated layers in die manufacturing are determined.