| With the constant development of the rapid prototyping manufacturing technology, directly making mechanical intensity metal function part becomes the hot spot in RP field .This paper takes metal sheet as modelling material of laminate object manufacturing , brings forward comprehensive optimization slice . Under the condition of not reducing the model precision, improves maximumly the model thickness of the metal sheet. Adopt the sloping cutting craft,cutting along the tangent line of sheet's mid point on Z . The essence of comprehensive optimization course is to conbine sloping cutting, optimal stratification direction and self-adaptation slices together. After analysis the thickness and principle error of the sheets, get the conclusion of the thickness of sheets increasing to 1mm. Optimal stratification direction makes model precision as goal to optimize orientation . In order to reduce the ladder effect, adopt the self-adaptation slice basied on the area changing .Have carried on the theoretical research to several main difficult points by producing NC code automatically. Realized the discernment and trend of the internal and external outline, established the foundation for cutter compensation. When calculate orbit of the cutter centre, calculated all the crossing coordinates of the crossing for straight lines and arc switching forms, offer gist to produce for cutter location.To realize sloping cutting the outline by translation axle numerical control , designe special strait handle conic milling cutters and round angle milling cutters from the respects , such as cutter material , structure and geometry parameter ,etc. During the course of designing conic milling cutters, get the the conclusion that when the angle between mid point tangent line and Z above 45°, should adopt the round angle milling cutter to the contained angle,. The design of the special cutter makes three coordinate numerical control slope cutting metal sheets be realized.
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