TIMKEN bearings rear axle an important part of the drive wheel movement. TIMKEN bearings in the main compound, able to withstand bending and torque, while absorbing the impact load. Axle overall hardened carbon alloy steel and quenching induction heating, hardening, the hardened layer depth of 4 - 6mm, Hardness 50 ~ 55HRC. TIMKEN bearings production often TIMKEN bearings burned phenomenon has seriously affected the production of TIMKEN bearings and parts induction hardening quality. The experiments show that, TIMKEN bearings burn area is located in the coil 225. Around the site, extension of the regularity of the fault characteristics of both.
Axle sensor heating, in addition to the workpiece is heated, the heat generated by the sensor of the major heat loss in three ways.
(1) heat to the surrounding radiation. Guidance magnet, an induction loop on the insulating paint and glass fiber cloth. This form of heat loss, heat evenly, and has little effect on sensor burnout.
(2) the heat of the cooling water. This part of the thermal cooling sensor, so that the induction heating safe operation. The study found that the 0-180 degrees, low water intake, indicating a good heat exchange cooling water, water well, water temperature; more than 180. , Because the flow path length, water temperature, water temperature, the heat exchange changes, the sensor can easily lead to a site (such as the 225 part) temperature rise, which is the main induction loop combustion.
(3) the thermal conductivity of the plates of the induction coil, the current density of the part of the board, the large cross-section and low water temperature in the region, an area of ??the coil of the heat transfer plate. 0-90 degrees and 270-360 degrees in parts away from the board of the nearby induction loop, good thermal conductivity; away from the plate, thermal conductivity, 90-270, induction loop, so that the greater induction loop temperature is easy to appear in this part of the phenomenon burned coil. Induction coil heat flow in different parts. Thermal sensing loop region in the vicinity of 225 degrees, and savings, so the difference between the combustion phenomena of the region prone to induction loop.
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