IKO attention self-aligning ball bearing structure vibration analysis

IKO bearing fatigue damage is divided into two kinds, one of the most important one is the most bearing parts peeling off small pit ( Pitting) , its depth and the measured width of contact area in rolling direction belong to the same order of magnitude. After pitting formation, under the effect of load, the edge of the metallic particles split mouth, and pitting along the rolling direction has the tendency of expanding, result can't use self-aligning ball bearing. Standard calculation must first determine the life of a bearing does this situation until the damaged work deadlines. The second form is surface layer peeling off. Peeling depth is shallow, usually only a few microns or less than 1 mu m ( Some literature 20 microns) 。 Usually turn millions or tens of millions of the bearing is running after turning into a period of spalling. In most cases these into a period of flake type will not damage the general purpose, No special requirement) IKO bearings, and for high precision and high speed bearing, does not allow this period of peeling off. At present, facing the bearing industry is the basic problem of reducing vibration and noise value of the self-aligning ball bearing. Solve the problem is the basic direction of improve IKO bearing manufacturing process, namely improve the geometrical precision of the rolling element and ring, reducing work surface roughness, the isotropic steel, using spotlessness lubrication materials, clean assembly condition, proper installation and use conditions. Bearing grease is usually make a similar viscosity or apparent viscosity, said when, on the viscosity of grease must specify the temperature and shear rate. Similar viscosity index can be used to control the low temperature fluidity and pumping. Measure bearing grease performance at low temperature is one of the important index of low temperature torque, namely at low temperature ( - 20 ° c below) Grease block bearing rotational degree of low speed flows, the low temperature torque of the grease by the starting torque and rotation torque after 60 mm average said. The evaporative (IKO bearing grease C) Said in the long-term use under condition of high temperature grease, grease oil volatilization, evaporative as small as possible. The evaporative mainly depends on the nature of the lubricating oil and fat fractions. Oxidation stability is refers to the grease when used in long-term storage or long-term high temperature resistance to heat and oxygen, permanent changes in their ability to maintain its nature will not occur. Due to oxidation, are often free alkali content reduced or free organic acid content increases, drop point drop, dark appearance, appear different smell, consistency, ultimate strength, similar viscosity decreased, generated corrosive product and destroy the material of grease, soap oil separation. In long-term storage of grease, therefore, should be stored in dry and ventilated environment, prevent sun, and shall regularly check free base or free change of the project such as organic acid, corrosion resistance, to ensure its quality and performance. As is known to all, even if the self-aligning ball bearing does not exist the geometric error, and assuming that material for each one with its parts, and even between the roller and the ring to produce pure oil film under the condition of continuous fluid, IKO bearings still vibrates. The reason for this is that the bearing itself, in other words, is due to structural properties, therefore, the structure vibration is mainly caused by two reasons: due to the effect of radial load, IKO bearing rotates the stiffness change of the structure vibration is the second reason, the result of a change in the same generation and the first case of the same frequency relative displacement of bearing ring. In the high accuracy of self-aligning ball bearings, the vibration is not obvious, but as the old increases of precision low noise bearing structure vibration may play a more and more important role. In the condition of bearing vibration, due to radial load ( Weight) Far less than the axial.