Based On The Step Standard Cad Product Data Integration System

STEP (Standard for the Exchange of Product Model Data),established by IS0,is an international standard for the computer-interpretable representation and exchange of product data.STEP referenced many existed data exchange standards,especially PDES, and is still under perfecting and expansion.As a unitive internation standard,STEP is supported by many well-known CAD system.This thesis is based on the science and technology project of GANSU province — THE INTELLIGENT DATABASE SYSTEM OF MECHANICAL CAD,some topic are studied and investigated according to the content on data exchange and share.In the first place,the evolution of Product Data Exchange is briefly introduced. Then the structure of STEP,the ultimate goal of STEP and its developing policy are analyzed in detail.Its up--to-the-minute status of its progress and the introduction of STEP'S characteristic of contribution to National Industry Information Infrastrcture Protocol are also included.Secondly,the implementation method of STEP standards is mainly analyzed thoroughly,a relatively new solve approach to fulfill data exchanging by using database is put forward,the method of how to build product information model,data dictionary, entity base information form are high lightly introduced,a crucial problem to store and fetch product data in database is solved.at the same time an idiographic example is provided.In the fourth paragraph,after analyzing the requirement to the information integration of CAD system,the feature modeling method and realization method are put forward,a prototype system of the product data integration based on feature is provided, at the same time the realization process and technology are expressed,a part information integration system based on step standard is developed,the feature of the part is recognized automatically by this system,at the same time,the information integration was contrasted with traditional system ,thereby get some character of the information integration.Finally,the example of resolvent is give out, this system select SolidWorks as exploitation platform, EXPRESS language as module expression language , VC++ as exploitation tools, a fully CAD exchange system which is included data module, former and subsequence processor, data dictionary and database. At the same time, the API of the SolidWorks is exploited in depth.