With the help of IGES standard file which was the exchange specification of initial graphics, different CAD system could change the data of product by neutral file’s format conversing. The automatic generation of 3D-Model curve surface in the MCNP input file was realized by using VC++ language.This method has solved the problem of the complication of MCNP geometric modeling process and the 3D-Model input problem in the MCNP. The input of MCNP was transferred the application problem of CAD/CAM software. The data and figure of varies software could be shared and converted. The work of design could be simple, the process of design could be speeded up and the cycle of design was shorted. Work efficiency and practicability were improved. If precision was controlled in 3D-Model, the result could be expected by contrast.

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With its broad application field, the injection mold has an important position in the mold industry. The key technologies of injection mold parametric design are studied deeply in this paper, and the injection mold rapid design system is developed finally. The rapid design system has friendly and convenient human-machine interface, can improve the design efficiency of injection mold greatly.