Jiaxing bearing | why cylindrical roller bearing ring fracture?

There is rotational, have HRB bearing ( ) Jiaxing bearing group sales co. , LTD. ( The company) Is bearing group co. , LTD. Established in jiaxing spot sales window, specializing in HRB brand bearings, facing the whole country, the existing stock 50 million yuan, covers the whole bearing, have very strong spot supply, is the group's retail sales center. Cylindrical roller bearing used in medium-sized machinery more of its use in the process of cylindrical roller bearing ring fracture accident is also one of a common problem. Here the author to share out the failure of cylindrical roller bearing ring, look at the picture mainly introduces bearing ring fracture analysis of concrete conditions. A, cylindrical roller bearing ring fracture of some macro reasons: 1, the outer wall of cylindrical roller bearing ring are severe pitting and extrusion deformation. 2, cylindrical roller bearing ring fracture with transverse fracture and longitudinal fracture. The fracture morphology shows that cracks are starting from the outer wall, extending to the lining tearing, in which both are located in the outer wall fatigue pitting and cracking, or fall off, in pieces of fatigue spalling, outside wall also found widespread pitting. Therefore, the contact stress caused by fatigue pitting and fall off, is probably bearing ring crack source point. In addition, the guard place due to axial thrust, plus processing relief groove deeper, stress concentration is bigger, is easy to fracture the guard. 3, 1 in pieces found on a macroscopic crack and the crack as surface crack, the contact stress is produced by fatigue crack, is a sign of fatigue peeling. Experiment, we use the metallographic cutting machine cutting sampling on bearing ring fragments, due to the vibration and the impact of the external load, makes further rupture, or crack of debris, rupture or crack at the rim, it shows that hard and brittle materials, shock resistance is poor, due to the structure stress of the guard, easier to rupture. 4, the cylindrical roller bearing ring inner surface also found several wear grooves and the peeling, and macro visible cracks. This suggests that relative sliding friction bearing ring on the shaft. According to the working principle of bearing, bearing ring interference fit should be on the shaft, shaft turns, bearing ring with shaft rotation, roller between the bearing ring and outer ring rolling, in order to reduce the vibration of the shaft. If the clearance between the shaft and bearing ring is too big, the shaft and bearing ring relative sliding friction, will cause the roller can't normal rolling, ring directly under a lot of contact stress and bearing overload work, leading to pitting corrosion fatigue and fatigue. Second, damaged bearing fatigue damage analysis 1, pitting corrosion and fatigue peeling for high vice ( The high pressure) Contact mechanical parts, are theoretically contact point, line, but in fact material after elastic deformation under load, theory of point and line contact becomes very small surface contact, the contact part will produce very high stress, the stress is called the surface contact stress. High parts of the contact stress of actual change cycle, in contact under the action of cyclic stress, the micro cracks on the metal surface to form a small first, then the direction of crack along with surface into acute Angle, when arrived at a certain depth, and the out surface of parts, finally, there are small pieces of metal peeling off, on the surface of parts to form a small pit, this phenomenon is called fatigue pitting ( 'Pitting') 。 Pitting is under the action of contact stress failure forms, belongs to fatigue failure. After bearing pitting failure happens, in operation, is usually a strong vibration noise and fever phenomenon. 2, fall off fatigue pitting corrosion and fatigue cracking in ring from a macro analysis shows that the influence of except near the collar of the fracture, the position of most of the freedom of fracture surface are associated with fatigue pitting corrosion and fatigue peeling, pitting and chipped for fracture source location of the fracture, to explain the brittle fracture and fatigue pitting of the ring and there is inherent relationship fall off. Pitting in transverse section microscopic observation macro and micro cracks found that the surface crack in the cause of pitting and spalling at the same time, effective bearing area is greatly reduced, the ring can also be a source of fracture, under the action of vibration causes ring of brittle fracture. If you are interested in the above HRB bearing the author introduces the information or have any questions, please click on the website on the right side of the online customer service or call:, you close the way of jiaxing bearing purchasing advisors. - - - - - - Editor: jiaxing bearing sourcing consultant LTD. All rights reserved, The company) Reprint please indicate the source