FAG Bearing Failure Analysis

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Metamorphic layer formation mechanism of the FAG bearing surface grinding, grinding metamorphic layer grinding heat and grinding force. The following analysis of the FAG bearing failure.
G rinding Heat: FAG Bearings, FAG bearings, grinding, grinding wheel and workpiece contact area, consume a lot of energy to produce large amounts of grinding heat, causing local transient high temperature of the grinding zone. Use of linear movement heat source heat transfer theory formula derivation, the instantaneous temperature in the method of calculation or application of infrared and thermocouple method measured experimental conditions, can be found in the 0.1 ~ 0.001ms, the instantaneous temperature of the grinding zone can be as high as 1000 to 1500 ℃. This instantaneous high temperature, sufficient to enable the work surface to a certain depth of surface layer of high temperature oxidation, amorphous organization, high-temperature tempering and secondary quenching, and even burn a variety of changes such as cracking.
(1) surface oxide: transient high temperature steel surface and the role of oxygen in the air or into a thin (20 ~ 30nm) of thin layer of iron oxi de.ball bearing companies
(2) of amorphous tissue layers: the instantaneous heat of the grinding zone to the surface of the molten state, the molten metal molecular flow is evenly coated on the surface of the work, and the base metal to be cooled extremely rapidly, the formation of extremely thin layer of amorphous tissue layer.
(3) high-temperature tempering layers: the instantaneous temperature of the grinding zone can make the surface a certain depth (10 to 100nm) is heated to a tempering heating temperature higher than the workpiece. With the improvement of the heating temperature in the case did not reach the austenitizing temperature, the surface layer will result in organizational changes that corresponds with the heating temperature to return fire or high temperature tempering, the hardness decreases.machine bearing
(4) Layer 2 hardening layer: When the instantaneous temperature of the grinding area of the surface layer is heated to above the austenitizing temperature (Ac1), the layer of austenitic organization in the subsequent cooling process, was re-quenching into martensite.
(5) grinding crack: secondary quenching the burn will make the surface layer of stress changes. Secondary quenching zone in compression, the following high-temperature tempering zone material existence of the maximum tensile stress, here is the most likely to crack the core.ball roller bearing