At present, most 3D CAD software can generate STL files, convert 3D solids into 2D contours, medical treatment mould suppliers and then send them to the rapid modeling machine layer by layer for processing and modeling. The correct STL files can fully undertake the task of data conversion between CAD and RPM.3 Information exchange between casting mold CAD and RPM w Rapid prototyping (RPM) is a manufacturing technology that has been rapidly developed in the past ten years. Solid molding, there are many different rapid prototyping methods, such as Lixiu solid modeling (SLA), selective laser sintering (SLS), laminated solid manufacturing (LOM), direct mold casting (DSPC), fusion Molding technology (FDM), etc.

The internal interface is used for data exchange and conversion within the CAD system; the external interface is used for data exchange and conversion of the product model between the CAD systems. It is a three-dimensional solid model that is exported to various rapid prototyping machines for layering by layering and slicing. These structures should be omitted in the design of the mold; for more complex structures,

they can be simplified according to process requirements; For the shrinkage rate, the shrinkage of the metal material during cooling should be considered and compensated during the design of the mold; the draft slope, in order to enable the casting to be demolded smoothly, the draft slope should be considered during the mold design.　　Design analysis and evaluation: through the computer-specific software program, the defined parts, assembly relationship and strength, weight, deformation, stress state are checked and optimized, and the design is optimized.　　

Database management: establish a data model, realize document management, product structure and configuration management, product design and manufacturing process management, engineering database and management database data exchange, and realize the preliminary integration of technical information and management information.1 3D modeling and modeling Virtual 3D modeling and solid modeling of castings are the foundation of virtual design of casting mold, which overcomes the traditional 2D design that can only describe the features of parts with views, but cannot build solid models

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