INA powder metallurgy bearing abnormal cause analysis after installation

In use process because of itself quality and external conditions, its bearing capacity, rotational accuracy and antifriction performance etc. Will change, when the performance of the powder metallurgy bearings is lower than the use requirement and when not working, is called the INA bearing damage or failure, bearing in the event of damage, such as accident happens, there will be stalling its machines, equipment, functional damage and other anomalies. Bearing should be taken before installation with petrol or kerosene wash clean, dry after use, and to ensure good lubrication, grease lubrication powder metallurgy bearings usually use, also can be used lubricating oil. Using grease lubrication, should choose without impurities, antioxidant, antirust, superior performance, such as extreme pressure grease. Grease filling quantity of INA bearings and bearing box - 30% of the volume 60%, unfavorable and overmuch. With sealing structure of double row bearing and water pump shaft bearing has good filling grease, users can directly use, not for cleaning. Bearing installation, it must be in the ring width on the circumference of a circle of equal pressure, to press the ring into, can not use ð ¨ +  top tools directly on bearing face, in order to avoid damage In the case of a small amount of interference, but at room temperature with the sleeve pin bearing ring end face, with a ð ¨ +  head banging on sleeve, through the sleeve ring is balanced If large quantities of installation, can use hydraulic press. Fashionable, should guarantee the outer end face and the shell shoulder end face, inner ring end face and the shaft shoulder end face pressure, there is no gap. Powder metallurgy bearings after installation should rotate test, first used in the axis of rotation or bearing box, without exception, with a power of no load, low speed, then according to the condition of operation gradually increase the speed and load, and detection noise, vibration and temperature rise, found abnormal, should stop and check. Running test normal rear deliverables. Contact fatigue failure is one of the most common failure modes of all kinds of INA bearings, is powder metallurgy bearing surface by the repeated actions of circular contact stress failure. Bearing parts surface contact fatigue spalling is a fatigue crack in the process of crack initiation and extension. Initial contact fatigue crack first from the maximum orthogonal shearing stress under contact surface, and then extended to form a hemp dot spalling or small exfoliate, the former is called pitting corrosion or pitting peeling; The latter is called the shallow flaking. Such as the initial crack on the border of hardening layer and the core area, caused the early spalling of hardening layer, it is called a hardening layer peeling off. Study the formation and reasons of powder metallurgy bearing damage has the vital significance, on the one hand can improve the using method, proper use of bearings, bearing should have adequately, on the other hand can help to develop new product performance better. In this article, in addition to the narrative in the rolling bearing use note, method of installation, operation and supervision thereof, also introduces the INA bearing damage form and the reasons and the countermeasures should be taken.