JIT Production Process Oriented CAPP System

Just In Time (JIT) production from TOYOTA in Japan was introduced toChina in the end of 1970s, but it was limited by Plan-Economic system then.Due to the open-policy, reformation of economic system, rapid development ofmanufacture, and the immigration of the world manufacture center, more andmore Chinese enterprises have implemented JIT stimulated by foreignenterprises fully adopted JIT. Distinguished from traditional production style, JIT regards the end pointof production as the start point of production planning and organization. So inJIT environment, traditional Computer Integrated Manufacturing System(CIMS) is no longer suitable for the production, and its function is greatlylimited. Especially Computer Aided Process Planning (CAPP) system in CIMSis only used to plan, query and manage processes in a long period, and can notsatisfy the production demands. So making CAPP serve the production processin JIT environment become the important problem of CIMS transforming toJIT production. In this paper, our research is based on analysis of JIT's characters, andbegins from the key problem of JIT -- standard-time. We deeply study thecomponents and calculation methods of standard-time, build the standard-timecalculation module, and design the corresponding software. We also emendand perfect the CAPP systems according to JIT's requirement, and build aCAPP system based on standard-time calculation module. The systemconstruction and its main feature including standard-time calculation,multi-process planning, process matching and typical process planning, andthe functions and the realization method are showed in details.