二十世纪中后期,随着计算机和信息技术的迅猛发展,基于网络的异地协同设计技术、虚拟现实技术、并行工程技术、基于知识产品数据重用、基于企业级PDM的产品数据管理与共享技术等成为计算机集成制造系统的新发展趋势,改革开放以来,现代机械制造企业为适应日趋激烈的市场竞争,提? In the middle and late twentieth century, with the rapid development of computer and information technology, web-based remote collaborative design technology, virtual reality technology, concurrent engineering technology, data reuse based on knowledge products, product data management and sharing technology based on enterprise PDM As a new trend of computer integrated manufacturing system, since the reform and opening up, the modern machinery manufacturing enterprises to adapt to the increasingly fierce market competition,