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NTN bearing burnout inspection analysis and avoidance methods

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NTN bearing rear axle drive wheel movement of some important components. NTN bearing work in the primary compound; can accept tortuosity and torque; together absorb some impact load. Axle carbon alloy hardened steel and hardening commonly used in induction hardening after hardening; hardening The depth of the layer is 4 - 6mm; the hardness of 50?55HRC.NTN bearing is found; the appearance of NTN bearing burnout often occurs; the quality of NTN bearing and parts induction quenching is seriously affected. The experiment indicates; the NTN bearing burnt area is located Coil 225. Adjacent to the construction site; expand the regularity of the fault characteristics on both sides.
Axle sensor heating; in addition to heating the workpiece; the heat generated by the primary heat loss sensor in the three methods.
.1) The heat radiates to the surrounding area. The magnet is guided; the induction coil is placed on the insulating varnish and the fiberglass cloth. The heat loss in this way is less; the heat is evenly distributed; the effect on the sensor is not much.
.2) the heat of the cooling water. This has some heat-dissipating and cooling sensors; the safe operation of induction heating. The research found; at 0-180 degrees; the low water temperature intake; the marked heat exchange cooling water; the water is smooth; The temperature of the water; more than 180.; because of the length of the flow path; the temperature of the water rises; the temperature of the water rises; the heat exchange changes; because the sensor can easily incur a temperature rise of a site (such as 225. about some); This is the primary induction coil incineration.
.3) heat-conducting plates of induction coils; current density of some plates; low cross-section and water-water temperature; area in this area; coils of heat transfer plates. 0 to 90 degrees and 270-360 degrees some away from adjacent induction Ring plate; good thermal conductivity; away from the board; poor thermal conductivity; 90 to 270 pieces of induction coil; making the larger induction coil temperature in this area appear in some of the appearance of burning coils. The heating current of the induction coil is not the same. The heat-induced circuit of the adjacent area of ​​225 degrees; and the savings were made; therefore, the difference between the incineration appearances of the induction coils in this area is large.

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