Date: 2013-08-20

FAG Bearings burnt out inspection and preventive measures

FAG bearing rear axle important part of the drive wheel movement. FAG bearings work compounds can withstand bending and torque, to absorb some of the impact load. Axle overall carbon alloy hardened steel and quenched after hardening, induction heating 4 - 6mm hardened layer depth, hardness 50 ~ 55HRC. FAG bearings the production often burned FAG Bearings, FAG bearings and parts of the production quality of induction hardening seriously affected. Test, FAG bearings burned out area is located in the coil 225. Around the site, and expansion characteristics of the regularity of the two sides of the fault.
Axle sensor heating, in addition to the workpiece is heated, the heat generated by the sensors of the main heat losses in three ways.
(1) heat to the surrounding radiation. Guidance magnet, induction loop on the insulating paint and glass fiber cloth. This form of heat loss, heat evenly, sensor burnout.
(2) the heat of the cooling water. Thermal cooling of this part of the sensor, so that the safe operation of the induction heating. The study found that the 0-180 degrees, the low temperature intake, showed a good heat exchange with the cooling water, the water smoothly, without the temperature of the water; over 180. , Since the flow path length, temperature rise, the temperature of the water increases, so that the heat exchange changes, since the sensor can easily result in a site (such as 225 on part) temperature rise, which is the combustion of the main induction coil.
(3) the thermal conductivity of plate member of the induction coil, the current density of the part of the plate, the large cross-section and the water temperature is low, the area, in the region of the coil of the heat transfer plate. 0-90 and 270-360 part away from the vicinity of the induction loop board, good thermal conductivity; away from the plate, poor thermal conductivity, 90-270 induction loop, so that the greater induction loop temperature in the region is prone to in this is part of a phenomenon burnt coil. Induction loop heat flow in different parts. 225 degrees near the area of thermal sensing circuit and savings, so the difference between the area prone to induction loop combustion phenomenon.

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