ISUTAMI BEARINGS
en
Failure form of GCr15 bearing steel
ISUTAMI BEARINGS

Failure form of GCr15 bearing steel

Bearing steel under the combined effect of complex factors, the bearing is destroyed after a considerable period of operation.

ISUTAMI believes that there are two main forms of destruction:

One is contact fatigue failure. Under the action of high contact stress, after repeated stress cycles, pits are generated in the local area of the working surface, so that the noise increases when the bearing works, the vibration is enhanced, the temperature rises, and the wear is intensified. The bearing does not work properly.

The other is wear and tear caused by relative activities. The normal form of failure of rolling bearings is usually fatigue spalling.

Fatigue failure of bearing steel includes two processes of generation and development of fatigue cracks.

The initial fatigue crack is generated at a certain depth from the surface, which is exactly the same as the depth of the maximum shear stress. For bearings of normal size, the maximum shear stress should occur somewhere between 0.35 and 0.55 mm of the contact surface, depending on the load.

The metal in this area first undergoes plastic deformation under the action of maximum shear stress. If the contact stress is greater than the contact fatigue limit of the material, as the number of stress cycles increases, the plastic deformation has been continuously plastically deformed, and fatigue cracking cannot be performed here due to plastic deformation.

Under normal conditions, the microcracks are at an angle of approximately 45° on the surface. The fatigue spalling crack on the contact track of the rolling bearing gradually expands under the action of repeated stress, and usually develops along the inner structure and the composition of the material and the uneven distribution of the stress until it extends to the surface, and breaks from the root of the crack to form fatigue spalling.
Related News
  • Polymer-Based bearings in Food and Beverage applications

    Polymer-Based bearings in Food and Beverage applications

    March 5, 2020By David Kaley — Trelleborg Sealing SolutionsWith easier cleaning, installation, and increased corrosion-resistance, plastic bearings and wear rings are a suitable alternative for industrial food pro...view
  • How it Works: Conveyor Roller Bearing

    How it Works: Conveyor Roller Bearing

    May 3, 2019Posted by Dave BieringFrom food packaging and processing to general material handling, the conveyor roller bearing is an underrated superstar of the manufacturing floor. You might even consider it the...view
  • How to identify the quality of rolling bearings?

    How to identify the quality of rolling bearings?

    July 28, 2019(1) Identification of radial ball bearingsFor a radial ball bearing with normal technical state, the inner and outer ring raceways shall be free of flaking and severe wear marks, and shall be a bright...view
  • Reducing mechanical wear in food processing while increasing productivity

    Reducing mechanical wear in food processing while increasing productivity

    February 5, 2020According to Food Engineering magazine’s 2018 State of Food Manufacturing Survey, “new equipment costs and features are always top of mind for processors that need to replace existing equipment or b...view
  • How to protect your bearing investment

    How to protect your bearing investment

    October 6, 2019Inspection and maintenance are important to maintain performance, extend service life, avoid downtime, and promote total cost of ownership.Bearing inspection and maintenance are important not only to ...view
  • Linear bearing installation steps

    Linear bearing installation steps

    August 10, 2019Linear bearing is arguably one of the most widely used modern machine tool parts, is used in many industries of sliding parts. Although many manufacturers bought linear bearings, I don't know how to i...view
  • TEL:+86-574-6399-8066
  • FAX:+86-574-6399 8025
  • EMAIL: sales@isutami.com
  • ADDRESS:No.500, North 3rd Ring Road West, Cixi, Ningbo, 315300, China