In order to keep the service precision of electric spindle supported by hybrid bearing , the method of reducing static and dynamic processing force by electromagnetic force is proposed and a magnetic lightening system is developed. Taking the grinding machine as an example, the dynamic model of the electric spindle system is established, and the regular between force and displacement is obtained. The static and dynamic force in grinding processing are analyzed and estimated. Then the static and dynamic load demands for service precision keeping of electric spindle are put forward. The magnetic lightening system is designed and developed, which includes the structure modules and the measurement - control module. Among them, the feature of structure module is the universal support scheme, and the measurement - control module supports open loop and closed loop control strategies. A special experiment is designed to verify the performance of magnetic lightening system. It is showed that the magnetic lightening system can satisfy the function of static load 35N and dynamic load 28N. It is preliminarily evidenced that using electromagnetic technique to reduce machining force is feasible. For the electric spindle with lightening device, it is more effective by using open loop load control strategy of artificial adjusting.
Key words
Hybrid bearing /
electric spindle /
magnetic lightening /
precision keeping /
service precision
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