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Tapered roller bearing parts work surface and center on the structure and properties of state, requirements are different, and the overall heat treatment often are not taken into account, the potential of materials can not give full play to the. Application of the surface strengthening technology can not only solve the difference between surface and center on the structure and requirements, but also can further make the surface for some special work performance, so as to meet the requirements of bearing working under special conditions on the surface properties of work.
So now the surface strengthening technology can be classified from different angles, classified according to physical and chemical process of surface strengthening technology, can be roughly divided into five categories: hardening, surface heat treatment, chemical heat treatment, surface metallurgy, surface film surface strengthening hardening deformation.
The wear failure refers to the failure of the relative sliding friction between the surfaces due to the surface of metal wear and the. Continuous wear will cause EDA damage to bearing parts gradually, and eventually lead to loss of precision bearing size and other related topics. Wear may affect the shape changes, increased clearance and surface morphology changes, may affect the lubricant or its pollution to a certain extent and cause lubrication complete loss of function, and thus loss of bearing rotation accuracy and can not operate normally. Wear failure is one of the common failure mode of bearings, according to wear form is usually divided into the abrasive wear and adhesive wear the most common.

Contact fatigue failure refers to the working surface of the bearing under alternating stress arising from failure. Contact fatigue spalling in bearing surface, often accompanied by fatigue crack, first from the contact surface following the largest alternating shear stress, and then extended to the surface spalling of different shape, such as point to point pitting or pitting spalling, shallow spalling in the peel into small flakes. The main reason of fracture failure of EDA bearings are two factors deficiency and overload. When the load exceeds the limit strength of the material as a result of parts breaking overload fracture.
Overload causes the main host of sudden failure or improper installation. Overload causes the main host of sudden failure or improper installation. Bearing parts of the micro cracks, shrinkage, bubbles, large foreign materials, organizations and local overheating burn defect in defect caused by fracture in severe shock or vibration overload also, known as the defect fracture. It should be noted, bearing in the manufacturing process, the raw materials into the factory inspection, casting and heat treatment quality control, process control through instruments and accurate analysis of the existence of the defect, the future must still strengthen control. It should be noted, bearing in the manufacturing process, the raw materials into the factory inspection, casting and heat treatment quality control, process control through instruments and accurate analysis of the existence of the defect, the future must still strengthen control. But in general, failure mostly overload failure bearing fracture usually thrown.
Bearing in the work, because the effect of external or internal factors, so that the original clearance change, accuracy, and even cause "killed" called the clearance change failure. External factors such as excessive interference, the installation is not in place, the temperature rise caused by the expansion of the quantity, instantaneous overload, internal factors such as residual austenite and residual stress is not chaos state are mainly caused by failure of the clearance change.