ABSTRACT
With the development of the manufacturing technology, an increasingly diverse tasks could be processed on single multi-functional machines, however, this kind of machines are much more complex than traditional single-functional machines. In reality, the reliability of the machines usually degrades with increased usage and time, which may cause the machines' breakdown and interrupt the manufacturing process. So it is important for the manufacturing industries to reduce unexpected breakdowns using preventive maintenance. This paper proposed a novel preventive maintenance method for single multi-functional machine based on reliability. In this method, adaptive preventive maintenance schedule is generated based on the degradation of the machine to avoid unnecessary machine stop, in addition, the conception of the remaining maintenance life is used to describe the machine degradation. It is worth mentioning that the reliability in mechanical manufacturing is more or less different from the traditional reliability in the printed circuit board. In this research, the actual machining time is used to evaluate the change of the machine reliability given that the actual machining time has much more important effect on the reliability of the machines than that of the idle time such as set-up time, waiting time, etc. Finally, an example is given to verify the proposed method of the optimal preventive maintenance schedule for single multi-functional machines.
