The abnormalities cause analysis after the installation of powder metallurgy bearing

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Reasons of quality and external conditions during use due to its carrying capacity, rotation accuracy and performance antifriction can change, does not work properly when the powder metallu rgy bearing performance is below the requirements, called bearings damage or failure, bearing unforeseen circumstances the event of damage, etc., will stall its machinery, equipment and functions subject to injury and other anomalies. roller bearing company
Bearing installation should be preceded with gasoline or kerosene clean and dry before use, and to ensure good lubrication, powder metallurgy bearings generally use grease lubrication, oil lubrication can be used also. Greased, should be used without the superior performance of impurities, anti-oxidation, anti-rust, extreme pressure grease. Grease filling is 30% -60% of the bearings and bearing capacity of the container, not too much. Double row bearings with a sealed structure and pump shaft bearings filled good grease, users can directly use, and can no longer be cleaned.
Bearing installation, you must apply equal pressure on the circumfere nce of the ring face ferrule pressed into not hammer first class tools directly for percussion end bearings, so as not to damage the bearings. At room temperature in the case of the small amount of interference, with a sleeve onto the end face of the bearing rings, with the hammer beating sleeve, through the sleeve will be pressed into the ring balanced. Bulk installation, to be used in the hydraulic machine. Press-fitting, should ensure that the shoulder end face of the outer ring end surface of the housing, inner ring end face and pressed by the end face of the shaft shoulder, and allowed gap. roller bearing
Rotation test should be carried out after the installation of the powder metallurgy bearings for rotating shaft or bearing housing first, without exception, will be no-load power, low speed, then gradually increase depending on the functioning of the rotation speed and load, and detection noise , vibration and temperature rise, abnormal, should stop running and check. Normal operation test before delivery.
Contact fatigue failure is the most common failure mode of the various types of bearings, powder metallurgy bearing surface by the repeated cycle contact stress arising from the failure. Contact fatigue spalling of the bearing surface of the part of a fatigue crack initiation, propagation process of crack. Initial contact fatigue cracks starting maximum orthogonal shear stress at the contact surfaces of the following, and then extended to the surface pitting like flaking or small flaking, the former is referred to as pitting or pitting and spalling; latter is called shallow flaking. Initial crack is generated in the hardening layer and the junction area of ​​the central portion, resulting in early peeling of the hardened layer, it is called the hardening layer exfoliation.
Research metallurgy bearing damage formation and causes have important sign ificance, one hand use can be improved, the correct use of bearings, to give full play to the bearing due performance, on the other hand contribute to the development of better performance new products. , Etc. In addition to the narrative of Rolling use precautions, installation methods, monitor the operation, this paper also focuses on the forms and causes of bearing damage and countermeasures to be taken. china ball bearing