An optimization strategy for 5-axis high-speed milling prostheses based on STL modeling

Aiming at the linear-interpolation shortage of tangency discontinuities and too many interpolation-points along tool paths, an optimization strategy of tool path is presented for 5-axis high speed machining prostheses based on stereo lithography modeling. In the strategy, unnecessary interpolation points are removed, consequently all the tool paths are simplified; the surface of envelope cutter orientation is smoothed adopting the advantages of ruled surface; a new method that G-codes generated by linear-interpolation are transformed into Spline-codes is put forward to support spline-interpolation CNC system. On the basis of the strategy, molar crown prostheses are correctly and rapidly manufactured in Mikron UCP800 machine tool. The test results show that the profits of the optimization strategy concern the reduction of machining time as well as the quality of the machined parts compared to those of linear-interpolation. Indeed, the tool-path continuity avoids the appearance of marks and facets.