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SKF imported bearing burnout inspection analysis and avoidance methods
Source: Bearing network time: 2014-03-29
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SKF imported bearings of automobile rear axles are important parts for driving wheel movement. SKF imported bearings mainly accept bending and torsion composite moments; they can accept certain impact loads together. Semi-axes are generally selected from medium carbon alloy steel after induction and quenching. Hardening; hardened layer depth 4 6mm; hardness is 50 ~ 55HRC. Found in SKF imported bearings; often exhibits the appearance of SKF imported bearings burnt; seriously affects SKF imported bearing product production and workpiece induction quenching quality. Inspection found; SKF imported bearings burned The bad areas are located in the induction circle 225. The left and right parts; the expansion to the two sides is a regular failure feature.
The professor pointed out that when the half shaft is heated in the inductor; the heat generated by the inductor is not only heating the workpiece; there are three methods of heat loss.
(1) Radiating heat to the surrounding area. There are magnetizing magnets, insulating varnish and glass cloth cloth on the induction coil. This way, the heat loss is small; and the heat dissipation is uniform; the effect on the sensor burnout is small.
(2) The cooling water takes away the heat. This heat reduces the temperature of the sensor; makes the induction heating work safely. The experiment finds that the water inlet is between 0-180 degrees; the water temperature is low; the cooling water heat exchange is outstanding; the water flow is smooth; The water temperature rises little, beyond 180. In the future; because the water flow path is long; the water temperature is increased; the water temperature rises to make the heat exchange worse; the temperature is likely to form a part of the sensor (such as the 225. The primary cause of the induction coil burnout.
(3) The heat of the induction coil is transmitted to the connecting plate; the current density of the connecting plate part. ã„‹å›å©Šèž… 垢 垢 蛩 åœ åœ åœ åœ Î¸ θ θ θ θ θ θ 在 在 在 在 在 在 在 在 在 在 在 在 在 在 在 在 在 在 在 在 在The temperature sensing ring is close to the connecting plate; the heat conduction is good, and the 90-270 degree sensing ring is far away from the connecting plate; the heat conduction is poor; the temperature of the induction coil in this area is increased; it is easy to exhibit in this section. The ring burned out. The difference in the heat of the induction coil is different. The induction coil is close to the heat storage in the 225-degree area and has poor conduction; therefore, the part is easy to show the appearance of the induction coil.
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