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

With the advancement of computer technology, the integration of computers into casting processes has become increasingly widespread. Computer-Aided Design (CAD) for casting is a system that utilizes computing power to optimize the design of castings. It includes data retrieval, parameter input, process planning, calculations, and automatic drawing. By combining casting process design with computer technology, CAD replaces traditional manual methods and personal experience, offering a more efficient, fast, and accurate approach. During development, database and graphics technologies are fully leveraged to support the entire design workflow. The system structure of casting process CAD must support complex 2D drafting, dimensioning, title block filling, and text editing. It also requires a comprehensive database and parametric graphic library. The system should manage all data and graphics generated during the design, allowing for easy supplementation, expansion, and enrichment of the database. Casting process CAD covers all design tasks from the initial part drawing to the final casting process drawing, including parting surfaces, machining allowances, draft angles, cores, gating systems, risers, and other design elements. Establishing and managing a casting process database is crucial for storing and organizing all necessary design information. This database serves as the core of the CAD system, providing essential parameters like metal density, shrinkage, negative mold, and gating/riser system details. Mathematical models used in riser and gating system modules are fixed, but their dimensions vary based on the casting. Microsoft Access is used to create a standard parts database, which is then queried automatically after parameter calculations. If standard parts are insufficient, custom programs generate graphical representations through interactive data transfer. To manage the database effectively, the software includes a management program that allows browsing, adding, deleting, and querying data. Various database operations such as ODBC and DAO are used to ensure secure and convenient data handling. The graphics library in casting CAD software plays a vital role in generating design drawings. AutoCAD 2000 is widely used due to its powerful drawing capabilities, rich editing tools, and user-friendly interface. Its open platform supports secondary development, enabling applications tailored to specific engineering needs. AutoCAD's development environment has evolved from structured programming to object-oriented approaches, with ARX being a key tool for creating intelligent, high-performance applications. Graphical parametric programming integrates a process parameter database with AutoCAD’s graphics library. It consists of three main components: the database, user interface, and parametric drawing program. The database stores size and performance data, while the drawing program generates graphics. The user interface, implemented through dialog boxes, connects the database and drawing functions. Custom drawing classes encapsulate variables and methods, enabling flexible and reusable code. Figure 1 shows a parametric drawing interface for a diesel engine gray cast iron riser. In the "New Riser" tab, users select parameters and click "Draw" to generate the riser. The "Modify Riser" tab allows adjustments to existing designs. A sample class definition for the riser drawing is provided, outlining parameters and functions for drawing and dimensioning. In conclusion, casting process CAD enables rapid and accurate process design by building a parameterized library of feeding systems, cores, and symbols. Combining AutoCAD’s drawing capabilities with ObjectARX and MFC ensures a user-friendly and highly customizable interface. The software offers automation suitable for designers at all levels, making it an essential tool in modern casting design.

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