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One of the characteristics of motorized spindle is its high running speed. Good lubrication of bearings is an important index to ensure its normal operation. Therefore, matching suitable motorized spindle lubrication system is very important.



Lubrication-related factors affecting the operation accuracy of motorized spindle are the heating of motorized spindle. The internal heat source of the motorized spindle comes from two aspects: 1. the heating of the spindle bearing; 2. the heating of the motorized spindle built-in motor.



To solve the problem of motor heating, cooling the stator of the motor can be achieved by circulating water cooling, which can take away the heat of the motor; to solve the problem of spindle bearing heating, it is necessary to take away the heat generated by the operation of the bearing in time. Traditional thin oil lubrication is to transport a large number of lubricants to achieve intrusive lubrication, at the same time, lubricants will take away heat. There are some disadvantages in this way of lubrication. One is to waste a lot of lubricating oil. The other is that the friction between lubricating oil molecules and pipelines in the process of lubricating oil circulation produces a lot of heat, which leads to the rise of oil temperature. At this time, lubricating oil can not only not play a good cooling effect, but also lead to the rise of bearing temperature, which is not conducive to the performance of spindle bearings. Therefore, the elimination of friction heat between molecules in liquid becomes the key to solve the problem. Practice shows that oil-gas lubrication can fundamentally avoid this situation. First of all, oil-air lubrication can provide a small amount of lubricating oil to meet the amount of lubricating oil required for bearings. Secondly, oil-air lubrication will not produce heat by friction of lubricating oil molecules, while clean compressed air will take away the heat generated by the bearing and keep the motorized spindle running at a stable temperature. In this way, the problem of thermal deformation caused by temperature rise can be effectively solved.