INA bearings use high temperature daily maintenance skills

Grinding the instantaneous high temperature can make the surface of a certain depth ( 10 ~ 100海里) Be heated to a temperature higher than the workpiece temperature tempering heat. In the absence of austenitizing temperature reached, with the improvement of heated temperature, the surface will produce one by one and heating temperature corresponding to the organization transformation, or high temperature tempering tempering hardness. The higher the heating temperature and hardness of the decline is more severe. The cause of the INA bearing heating and its elimination method ( 1) Methods: the axial force is too big to clean, 0 is seal mouth ring clearance requirements. 2 to 0. 3 mm, correcting impeller balance hole diameter and check static equilibrium value. In the grinding, grinding wheel and workpiece contact zone, consume large amounts of energy, to produce a large number of grinding heat, local transient high temperature caused by grinding area. On the basis of the theory of linear motion heat source heat transfer formula derivation, calculation or by the method of infrared ray and measured experiment under the condition of instantaneous temperature thermocouple method, can be found in 0. 1 to 0. The grinding area within 001 ms instantaneous temperature up to 1000 ~ 1500 ℃. The instantaneous high temperature, which would have made certain depth on the surface of the work surface to produce high temperature oxidation, amorphous group, high temperature tempering, secondary hardening, and even burn cracking and other changes. ( 1) Amorphous layer organization grinding the instantaneous high temperature makes the workpiece surface reach a molten state, molten metal molecular flow is evenly coated to the work surface, and the matrix metal cooling at breakneck speed, formed a very thin layer of amorphous tissue layers. It has high hardness and toughness, but it is only about 10 nm, it is easy to be removed in the precision grinding processing. ( 2) High temperature tempering layer ( 3) Surface under the action of transient high temperature oxide layer of the surface of the steel and the oxygen in the air, rises into extremely thin ( 20～30nm） The iron oxide thin layer. It is worth noting that the oxide layer thickness and surface grinding metamorphic layer is the total thickness test results in corresponding relation. This shows that the thickness of oxide layer, is directly related to the grinding process is an important symbol of grinding quality. 1, first of all have to really INA bearings, if you buy the fake bearing on how to do can live longer. 2, before installing the bearing, the first thing to check whether the bearing is short of oil, clean, and then check to install the machine parts, determine the good and clean grease, bearing correct installation. 3, bearing the trial, after installation, bearing the trial running, running for a while check found nothing abnormal, the bearing into a state can be normal use. 4, check regularly, each kind of bearing lubrication is critical, bearing is not exceptional also, in the maintenance of the bearing, the first thing to check whether the bearing surface is clean, if not clean, then use gasoline or alcohol rinse again first, and then is crucial, is the grease. Do not have to bearing grease more grease, as long as a little grease on friction between the two, if the presence of pollutants, can be felt. To use bearing grease, should avoid with any part of the cotton fabrics in contact with the bearing, it will make some residual fiber on rolling and likely to cause damage. Make sure good time for each of the inspection, and then according to the normal time to check whether the lack of oil is clean, do well this INA bearings can live longer.