Application of Computer Technology in the Development of Casting Process CAD Software
With the development of computer technology, the application of computer in casting is more and more extensive. The CAD of the casting process computer-aided design is the best design of the casting to be designed by computer system in the design of casting process, including data retrieval, parameters and Design information query, process plan determination, calculation, automatic drawing, etc. The casting process CAD combines the casting process design with the computer technology to replace the manual and personal experience for the casting process design conveniently, quickly and accurately. In the process of development, the computer database technology and computer graphics technology are fully utilized.
1 System structure of casting process CAD
The development and design of the casting process CAD software not only requires the system to carry out complex two-dimensional drawing, dimensioning, filling in the title bar and editing functions of graphics and text, but also has a complete process design database and a parameterized graphics library. And the collection and sorting functions of various texts, data and graphics generated during the design process, for the related data and graphic classification management after the design is completed, supplementing and expanding, enriching the database resources. The casting process CAD refers to all the process design work that should be completed from the part drawing input to the casting process drawing output. It mainly includes the parting surface of the casting, the machining allowance, the draft angle, the core head, the casting system, the riser and the design of various process symbols.
2 casting process CAD database Establishment casting process parameters and database management <br> <br>, designed for storage and information management needs of the casting process design, database is the core casting process CAD system, all of the design and drafting work have been established In this public database, its functions are: it can provide the process parameters required for all design contents in the design process, such as metal density, shrinkage rate, negative type, pouring system parameters, riser system parameters. The mathematical model and structure used for the riser design module and the gating system design module are fixed, and the only difference is the specific size of the casting. Therefore, this type of module first uses Miscrosoft Access to build a standard parts database according to the type, shape, modulus, size and other parameters of the casting. Before the drawing, the juice machine first calculates the process parameters of the casting, and then automatically queries the standard parts according to the calculation result. Database, when the standard component can not meet the design requirements, the custom data program module automatically converts the calculation result into a graph on the screen through interactive data transfer.
In order to effectively manage the casting process parameter database, the software provides a database management program, in which various operations (including data browsing, adding, deleting, querying, etc.) can be performed on the data.
Database program design The software makes full use of the advantages of various database operations according to actual needs, and is used separately. DBC (Open Database Connectivity), DAO (DataAccess Objects), and other database processing methods to manage data conveniently and securely, ensuring the use and storage of data.
3 Graphic library of casting process CAD software
3.1 AutoCAD2000 graphics system Casting process The main purpose of CAD is to output the process and tooling design drawings in the form of man-machine dialogue. Therefore, the graphics system is an important part of the casting process CAD. Fundamentally, the CAD graphics system consists of a graphics core system (drawing software) and a series of graphics input and output functions and subroutines nested in a high-level language. In recent years, the micro-computer graphics system has developed rapidly, and the AutoCAD software introduced by Autodesk in the United States is the most popular. AutoCAD's powerful drawing functions, rich editing sub-segments, and good human-machine interface make AutoCAD play an important role in all walks of life. It also provides an open platform for the development of all walks of life. An ideal environment for AutoCAD software vendors. The secondary development application software on the AutoAD platform has been widely used in various engineering fields, and the methods and environments for secondary development of AutoCAD are constantly being developed and improved.
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