图2 基于框架技术的开放式CAPP平台
Fig.2 Framework-based open architecture CAPP platform
3.2 通过BOM转换实现集成化
如上所述,工艺设计是诸多制造活动的交汇点,因而工艺设计信息化对于集成不同的制造信息系统具有重要意义。实现信息集成的基础是信息标准化。但是,由于工艺设计信息内容广泛,而且难以统一,因而目前对所有的工艺信息进行标准化还不太现实。为此,有必要寻求在不同制造活动中联系最为密切的信息,将其作为不同系统信息集成的主线。显然,物料单(bill of material,BOM)是一个最好的选择。课题组提出了面向BOM的工艺设计,将工艺设计理解成为BOM的演变过程,并将面向设计的工程BOM (EBOM)向面向生产的制造BOM(MBOM)转换作为CAPP的主要功能之一。EBOM与MBOM的差别体现在多方面,包括物料演变、物料增加以及结构调整等。CAPP将EBOM转换为MBOM后,能够为生产管理提供更加准确的、符合实际制造情况的产品结构信息和物料信息,从而真正发挥信息桥梁的作用。
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Practice and Consideration on CAPP
Li Peigen, Zhang Guojun
(Huazhong University of Science and Technology, Wuhan 430074, China)
[Abstract] Computer aided process planning (CAPP) has been regarded as not only an important research area for the informatization on shop-floor level, which presently remains a relatively weaker sector in information-based manufacturing, but also a bridge across the informatization of shop-floor and enterprise levels. For its wide spectrum of tasks with vast amount of contents involved, as well as for its strong necessity in customization to different manufacturing sectors and various manufacturing processes, CAPP has met with difficulties in generalization and commercialization. On the other hand, due to its position as cross point among various manufacturing activities, it has been proven difficult in integrating with other enterprise application systems. This paper introduces some advancements in our R&D of CAPP, which includes the application of framework technology in the development of an open architecture CAPP platform, system integration based on BOM transformation, as well as promoting the application of CAPP thorough solving typical problems for some specific industries. In addition, some trends in the R&D of CAPP are also pointed out, i.e., quantified analysis and parameter setting, CAPP based-on 3D models and CAPP for shop-floor applications are important directions for further R&D in this area.
[Key words] manufacturing; informatization; CAPP(end)