Abstract
Introduction of flexible machining systems incorporating robotic manipulators for high speed transfer of tools and workpieces entails high capital investment. This is an important constraint which limits the scope for experimentation and emphasises the importance of reliability as a deciding factor in the use of such systems. This paper describes a typical flexible machining cell configuration. Operational details relating to its elements and their components are included. A large amount of data concerning the failure characteristics of various subsystem elements are gathered and processed. Using a representative sample, qualitative and quantitative analyses of the system reliability are carried out using various reliability evaluation techniques. These include block diagram analysis (BDA), fault tree analysis (FTA) and a discrete Markov model. In particular attention is paid to the availability of the robot-assisted tool delivery system, including sensing, measuring and signal conditioning devices.
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