Use of vibrations analysis technique in condition based maintenance

Sammanfattning: Condition based maintenance, CBM, means that an a priori defined; preventive task isperformed at certain condition of the equipment. This strategy is much more cost effectivethan maintenance on failure or scheduled maintenance. When running to failure, an unplannedinterruption to production or service is induced. Also a collateral damage may occur, leadingto costly consequences. Extensive spare parts inventory has to be kept in place as well.Scheduled preventive maintenance results usually in repairing or replacing components tooearly or too late, leading in a maintenance that is to expensive and ineffective in preventingbreakdowns.To improve availability, the system is redesigned for higher reliability and the need formaintenance is minimized. The maintenance is also be carried out in more effective manner,and in a planned way. Finally, some condition indicators are monitored to observedeterioration and detect onset of failures.This project is aimed at analysis of MAZAK 3-axis CNC milling machine, andidentifying possible condition indicators based on vibration measurements and analysis.The construction and operation of a MAZAK 3-axis CNC milling machine is availablefrom an operating manual. An extensive literature study has been done to come across withthe state of the art in vibration based analysis of machine tools, and the goal is to go beyondthe state of the art. Extensive practical vibration measurements are performed in thelaboratory and analysis is done in matlab.