Contact fatigue failure means TIMKEN bearing surface by alternating stress to produce failure. Contact fatigue spalling TIMKEN bearings work surface, often accompanied by fatigue crack from the contact below the surface of the largest alternating shear stress at first, and then extended to the surface to form a different shape of peeling, such as point-like flaking pitting or pitting , flake into small pieces known as shallow spalling. Peeling surface gradually expanded, and often extended to the deep, forming a deep peeling. Deep peeling is the source of the contact fatigue failure of fatigue.
TIMKEN bearings a Card injury phenomenon state
The so-called card hurt the surface damage arising as a result of minor burns summary TIMKEN bearing part to the injury in the sliding surface. Slide surface, the rolling surface of the circumferential direction of the linear scars. Roller end of the pendulum linear scars close to the axis of the roller face of the torus card injury.
TIMKEN bearings card hurt phenomenon
Too much load, too much preload. Poor lubrication. Foreign objects. The inner ring outer ring of the tilt axis of the deflection. Axis, the accuracy of the bearing housing is bad.
TIMKEN bearings emergence of the card hurt phenomenon, measures
Check the load size. Preload should be appropriate. To improve the lubricant and lubrication method. Check the shaft, the accuracy of the bearing housing.
TIMKEN bearing fracture failure mainly due to defects and overload the two major factors. When the applied load exceeds the strength of the material limits of the part fracture is called overload fracture. Overload is mainly due to a host of unexpected failure or improper installation. TIMKEN bearing part of the micro-cracks, shrinkage, bubbles, large pieces of foreign debris, overheating organizations and local burns and other defects in the impact of overload or excessive vibration also caused by defects at the fracture, known as the defect fracture. It should be noted that the bearings in the manufacturing process, raw materials into the plant reinspection, forging and heat treatment, quality control, process control instrument to correctly analyze the above-mentioned defects, must be strengthened in the future control. But in general, usually TIMKEN bearing fracture failure most of overload failure.
TIMKEN bearings at work, due to the influence of external or internal factors, so that the original with the gap changes, the accuracy is reduced, and even result in a "killed" as the failure of changes in the clearance. External factors such as interference is too large, installed in place, the temperature rise caused by the expansion of the amount of transient overload, internal factors, such as retained austenite and residual stress in the unstable state and so is the main reason for the changes in the clearance failure.


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