, the reconstruction of the free form surface with discrete points based on a special Hermite's interpolation; the definition of the hogging areas by means of the curved surface intersection and tool path arrangements.

First, use"birth and death"element and dynamic load step technique to simulate the material removal and tool path respectively, analyzed the machining deformation and effect rule caused by the tool route under the coupling of initial residual stress, fixturing stress and milling residual stress.

In this paper,the mathematic model of bus routing problem,which takes the maximum sum of dynamic nonstop passengers with bending modulus restricted,is established and the solution algorithm based on ant colony algorithm is developed.