The Design Of The Computer Aided System Of The Metal Bellows Expansion Joint

As a new type of system components, Metal bellows expansion joint played an irreplaceable role in the metallurgy, oil refining, petrochemical engineering, electricity, heating network, ships, aerospace and other fields due to its fine stability and high reliability.Metal bellows expansion joint is non-standard device. Its structure and mechanical properties will be different by changing the temperature, pressure, displacement and cycle life. As a result, its design, calculation, drawing and processing turned to be very complicated. Recently, expansion joint industry need a set of accurate and reliable, practical and professional aided design software, therefore, this paper probes the expansion joint manufacturers association of the United States (EJMA) Standard 2003 Article 8 and version of the new standards GBT/12777-2008 to make a new and targeted design on the basis of the reference in calculation software bellows at home and abroad to meet the urgent need of this industry.This paper discusses the design principles and development process of the computer aided system of the metal bellows expansion joint. According to the demand and functional analysis, the author chooses the Visual Basic 6.0 as the development environment, sets up a particular algorithm class of the expansion joint by using the dynamic-link library (DLL), this paper researches the welding features and the active welding methods of the metal bellows expansion joint in depth, compiles the intelligent Computer Aided Process Planning(CAPP) module of welding procedure; analyzes the method of object modeling and automatic mapping of AutoCAD; at the same time, the author designs a convenient and utility module of the cast accounting and realizes a function of the design book as a Two-way by using the Word API interface, then finishes the highly integrated computer aided platform of metal bellows expansion joint, which has design, calculation, calibration, welding technology guidance, automatic mapping, costing, two-way design book and a number of important functions. According to analyze the features of each module, the system sets up the corresponding databases and designs their data type and list structure based on the Microsoft Access 2003 database software, reads and saves the contents of the database by means of the ADO database access technology, optimizes the date processing, makes the program structure more properly and increases the program operating efficiently through setting up a public module of database accessing.The design functions of this system are proved to reach the prospective developing goals and meet the practical requirements of enterprise production through many metal bellows expansion joint-made enterprises, it saves designers design time, reduces the probability of error. Meanwhile, it provides a scientific evidence to develop a more reasonable man-hour quota and improves the management, realizes the standardization and the optimization of the design development of the metal bellows expansion joint.