Study of the NURBS Describing Method on the Mold Cavity of the Molding Tool

The Mold Cavity of the Molding tool is linked by the different curved surface smoothly and gradually .The describing methods of the surface of the mold cavity of the Molding tool have the gridding method, the algebraic method and the NURBS method. The NURBS describing method on the mold cavity of the molding tool is studied in this article, the analyse is presented.