Research on imperfect preventive maintenance strategy for turret system of the CNC lathe

The turret system is one of the key functional components of the CNC lathe. Therefore it is important that the reliability of the turret system is optimised. In this paper, an imperfect preventive maintenance strategy, based on the Weibull distribution, for the turret system of the CNC lathe is proposed. The restoration and failure intensity increase factors are consistent with a uniform distribution. However, the cost of preventive maintenance increases with the preventive maintenance frequency being increased. Then maintenance time should also be considered. A flexible preventive maintenance model is described in this paper. The aim is to minimize the total maintenance cost overall. The preventive maintenance interval of the model was calculated using the limited reliability value, in order to find the optimal flexible preventive maintenance strategy. Finally, the optimal preventive maintenance results under different cost parameters are discussed.