FAG bearing areas of application and the reasons for failure

　　　　Since 2001, FAG became a part of Schaeffler Group, and in the group the aerospace, automotive and industrial sector has played an active and important role. Phase combined with the INA products, FAG rolling bearing industry in the licensed products with the industry's most Special Bearing complete framework. Covering consumer machinery, energy transmission and rail technology, heavy industry and consumer operations of all areas of application.

　　FAG bearing failure caused the cause of

　　FAG bearing surface grinding based on the task transformation layer formation mechanism of grinding is an important factor transformation layer grinding heat and grinding force. The above analysis we come to look for the cause of FAG bearing failure.

　　1.FAG bearing grinding heat

　　FAG bearings in grinding, the grinding wheel and workpiece contact area, a small amount of energy consumption, the occurrence of a small amount of grinding heat, forming part of Shashi grinding zone temperature. Practical application of linear stationary heat transfer formula, plan or application of red paint method and thermocouple Shashi measured Needle Roller Bearing the temperature under test conditions, can be invented in the 0.1 ~ 0.001ms Shashi within the grinding zone temperature can be as high as 1000 1500 ℃. This Shashi low enough to make the task of the outer surface appearance of the depth of occurrence of certain low-temperature oxidation, amorphous organization, low-temperature tempering, secondary hardening, cracking and even burns and other changes.

　　(1) oxide surface

　　Lost all appearance of steel under low temperature and the role of oxygen in the air or into very thin (20 ~ 30nm) thin layer of iron oxide. It is noteworthy that the oxide thickness and surface grinding of the consequences of transformation is the total thickness test was the corresponding relationship. This explains the oxide thickness is coherent with the grinding process indirectly, is an important marker grinding quality.

　　(2) amorphous layer of tissue

　　Shashi grinding zone temperature reaches the melting of the workpiece surface condition, the molten metal molecular flow has been evenly coated on the task looks, and is the base metal to be cooled extremely rapidly, forming a thin layer of amorphous state of tissue layers. It has high hardness and toughness, Pressed Bearing but it is about as long as the 10nm, it is easy to be in fine grinding removed.

　　(3) layer of low-temperature tempering

　　Shashi grinding zone temperature can make sure the depth of appearance (10 ~ 100nm) is heated to above the workpiece within the heating tempering temperature. Did not reach the austenitizing temperature in the situation, as was the progress of the heating temperature, the surface layer will occur with the heating temperature should be the absolute return fire or to Thrust Bearing change the organization of low-temperature tempering, the hardness also will be landing. The higher heating temperature, hardness, also landed the more fierce.