Application of Computer Technology in Development of CAD Software for Foundry Process

With the advancement of computer technology, the application of computers in casting has become increasingly widespread. Computer-Aided Design (CAD) for the casting process involves using computer systems to optimize the design of castings, including data retrieval, parameter analysis, process planning, calculation, and automatic drawing. By integrating casting process design with computer technology, CAD replaces traditional manual methods and personal experience, offering a more efficient, fast, and accurate approach. During development, computer database and graphics technologies are fully utilized to enhance productivity and accuracy. The system structure of casting process CAD requires not only advanced 2D drawing and editing capabilities but also a comprehensive process design database and a parametric graphic library. It should support the collection, sorting, and classification of data, characters, and graphics generated during the design process. This allows for continuous expansion and enrichment of the database. The CAD system covers all necessary steps from inputting the part drawing to outputting the casting process drawing, including decisions on parting surfaces, machining allowances, draft angles, cores, pouring systems, risers, and other process symbols. Establishing and managing a casting process parameter database is crucial for storing and organizing the information needed for foundry design. This database serves as the core of the CAD system, providing essential parameters like metal density, shrinkage, negative mold dimensions, gating and riser system settings. Mathematical models for riser and gating modules are standardized, with differences mainly in casting size. Microsoft Access is used to create a standard parts database based on casting type, shape, modulus, and size. Before drawing, the system calculates process parameters and automatically retrieves standard parts. If standards aren't met, custom data is converted into visual representations through interactive data transfer. To manage the database effectively, the software includes a database management program that allows users to browse, add, delete, and query data. Various database operations—such as ODBC, DAO, and others—are used to ensure secure and efficient data handling. In terms of graphics, the AutoCAD 2000 system plays a key role in generating process and tooling design drawings. Its powerful drawing tools, rich editing functions, and user-friendly interface make it widely adopted across industries. The secondary development environment of AutoCAD, including ARX, offers object-oriented programming capabilities, enhancing efficiency and flexibility. ARX allows direct communication with AutoCAD, faster database access, and the creation of reusable classes for advanced design tasks. Graphical parametric programming combines a process parameter database with an AutoCAD graphics library. It consists of three main components: the database, user interface, and parametric drawing program. The database stores graphic dimensions and performance parameters, while the drawing program generates visuals. The user interface connects these elements, often implemented via dialog boxes. Object-oriented design is used to encapsulate variables and functions, enabling dynamic and flexible design processes. Figure 1 shows a parametric drawing interface for a diesel engine gray cast iron appendix. In the "New Riser" interface, users can select parameters based on weight and click "Draw" to generate the riser. The "Modify Riser" tab allows for adjustments. The code for the riser drawing class demonstrates this approach, with member variables for size parameters and functions for drawing and dimensioning. In conclusion, casting process CAD enables quick and accurate process design by combining plant-specific libraries with parameterized drawing mechanisms. Integrating AutoCAD’s drawing power with ObjectARX and MFC improves usability and flexibility. The software supports automation and is suitable for designers at all levels, making it a valuable tool in modern casting design.

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