What are the bearing ring fracture mode, you know that several?

Bearing ring fracture, common problem is the bearing network is summarized here bearing ring fracture can stop from two aspects, one is the defect fracture, fracture, another is to use defect fracture can mainly from the original data problem and stop in the process of process analysis, with the fracture is fatigue caused by reasons such as transition. First of all, we can see the bearing ring defect fracture reasons are: one, the original data with, osteoporosis, brittle element segregation or carbide liquid chromatography, mesh, ribbon, not survived well and other defects in processing work together are not eliminate or improve, will form stress concentration, weaken the ferrule fundamental strength, become the source of crack. Disposal methods: preventive measures is insisted on a supply of main channel, and try to purchase steel quality is stable and increasing the incoming inspection of purchased steel, from the source the better off. Two, grinding process have crack present disposal ways: strengthen the monitoring of grinding process, waste bearing ring grinding burn and grinding cracks are not allowed to exist, especially the inner ring to taper the mating surfaces shall not be burned. If ring should stop full inspection after pickling, picking burns products, severe burns can't repair or repair the unqualified should be scrapped, there is no grinding burn ring into the assembly process. 3, heat treatment of improper disposal way: to deal with soft point defects such as large type bearing ring, should be to determine the composition and properties of quenching oil, not request to advance to change, to the rapid quenching oil replacement, to strengthen the quenching medium for hardening ability, improve the quenching cooling conditions. Tough tempering process. For fracture is more kinds, in the ring after coarse grinding stop secondary tempering, it can be further stable organization and dimensions of the ring, can decrease again ooze grinding stress, improve grinding transformation layer properties. Bearing ring also often attack in the process of using fracture phenomenon, its main there are three ways, are: fatigue fracture, fracture and thermal overload fracture. 1, fatigue fracture bearing ring ( Special outer ring) Under alternating load and impact load, the stress from time to time beyond acceptable material fatigue strength limit of fatigue crack, crack eventually extended to a certain level from parts of maximum stress fracture. Ordinary attack in the bearing outer ring of bearing area, due to the outer ring is usually fit for clearance fit with the bearing box holes, combined with the bearing box body is a flexible type and ellipse parts, under the alternating load and impact load are fatigue fracture. 2, overload fracture similar to fatigue fracture, used as a bearing on the stress, greater than the data of tensile strength, the inner ring crack, usually due to the improper installation, such as bearing assembly tilt, forming load bearing, bearing part of the overload provoked fracture; Improper tapping formation bearing crack impellers when another device, also due to overload crack category. The most common interference device, and bearing fit size can cause large amount of interference of bearing ring crack ( There are mainly four row cylindrical bearing inner ring interference fit) , too much interference from inner ring stress is larger, especially for thin section thickness ( Thickness of section < 12 mm) Inner ring, too much interference often cause inner ring axial crack. 3, fracture is mainly due to the thermal fracture with bearing ring end face sliding friction between the parts of attack, in under the action of axial force, frictional heat, producing led to burn face along with color, and so on and so forth, friction and heat cause bearing ring width crack, crack characteristics is perpendicular to the direction of friction work, also end surface crack on thin cross section thickness ( Thickness of section < 12 mm) Within the circle of influence is bigger, especially overloaded high or medium speed mill roller bearing. Here, we should pay attention to bearing ring fatigue fracture and overload fracture is likely to be present at the same time, especially the retired poor bearing ( Such as 22328, etc. ) 。 Phenomenon of the discussion to the ring fracture, not as long as the defects from occurring in the process of information and consumer the Angle to think, but also to the structure of the bearing parts size, measurement method, machining process, bearing elements such as retirement conditions stop the discussion. 1, bearing structure and retirement conditions. Different structure suitable retirement conditions; Bearing parts to construct the different processing technology is not the same, will affect its quality. So we should develop new construction products, in order to adapt to different retirement conditions, and can be made on the bearing used to clarify its appropriate retirement conditions or performance, so that when the customer choice. 2, enhanced technology research, improve the processing technology, progress in processing quality, reduce the possibility of defects in the processing. As in the heat treatment on larger species inside and outside the circle, as far as possible in the lower quenching heating temperature, comply with the extended holding time, alloying concentration to progress, increase the fracture strength of martensite, and on the premise of guarantee quality choose the higher tempering temperature in order to strengthen the impact toughness of artifacts. 3, improved processing and monitoring the wrist, and promote the processing quality is improved. Such as improved circulation way curvature position monitoring, advances the overall performance of the bearing is assembled, improve bearing work situation. Attack more bearing ring fracture phenomenon, is one of the problems of trouble bearing quality unceasingly, the fault of bearing network share here: used as a bearing ring on the stress, tensile strength is greater than the information or data of fatigue strength limit, to cause ring crack, crack eventually extended to a certain level of attracting a local complete separation of the parts, called a crack or break.