Reasons and Preventive Measures of Sliding Bearing Holding the Shaft
Here is an example of a flat grinding head spindle using a spindle bearing structure with one end sliding and one end rolling. Among them, there are three friction states between the sliding bearing and the main shaft: boundary friction, liquid friction, and mixed friction.
Boundary friction means that the two sliding surfaces are separated by the boundary adsorption film formed by the direct combination of polar molecules in lubricating oil (generally present in surface active additives such as oleic acid and fatty acid) and the metal surface, or by a boundary adsorption film containing sulfur, chlorine, etc. , phosphorus and other active substances are separated from the inorganic salt film formed by chemical action on the metal surface.
Liquid friction means that the two sliding surfaces are completely separated by a layer of lubricating oil (carrying oil film).
Mixed friction refers to something between the above two states. Or the case of boundary friction is more; or the case of liquid friction
