TIMKEN bearing failure basic protective measures

TIMKEN bearing failure generally can be divided into failure and accuracy loss of two so far. Failure stop rotation of the rolling bearing terminated due to lose the ability to work. For example, stuck, fracture, etc; Precision loss refers to the bearing for dimensional change, lost the original design requirements of precision, is still can continue to roll, but belong to improper operation, such as wear and corrosion. The influence factors of bearing failure is very complex, and because of difference of all kinds of the working conditions and structure of the bearing, the failure forms and morphology characteristics also each are not identical. According to its damage mechanism can be roughly divided into: contact fatigue failure, friction and wear failure, failure of failure, corrosion, deformation and clearance change failure etc. Several basic modes. 1. Contact fatigue, Fatigue wear) Failure of contact fatigue failure is one of the most common failure modes of all kinds of rolling bearing, is contact stress by TIMKEN bearing surface cycle repeated function 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. 2. Adhesive and abrasive wear failure is one of the most common failure modes of all kinds of bearing surface. Bearing parts between the relative sliding friction causes the surface of the metal loss known as sliding friction losses. Continue to wear will make the parts size and shape change, rolling bearing fit clearance increases, working surface morphology becomes bad, thus loss of rotating accuracy, bearing cannot work normally. Sliding wear forms can be divided into the abrasive wear, adhesive wear and corrosive wear and fretting wear, etc. , one of the most common for abrasive wear and adhesive wear. TIMKEN bearing installation necessary premise in a dry, clean environment. Before installation should carefully check the shaft and the shell surface, convex shoulder of end face and groove and the connection surface machining quality. All matching connection surface must be carefully cleaned and remove burrs, bearing raw surface must remove all sand casting. Bearing should be taken before installation with petrol or kerosene wash clean, dry after use, and to ensure good lubrication, grease lubrication, commonly used rolling bearing lubrication may be adopted. Using grease lubrication, should choose without impurities, antioxidant, antirust, extreme pressure grease function such as superior. Grease filling quantity for bearings and bearing box - 30% of the volume 60%, unfavorable and overmuch. With sealing structure of double row tapered roller bearing and water pump shaft bearing has good filling grease, users can directly use, shall not be clean. TIMKEN bearing installation, bearing must equal pressure on the circumference of the ring width, 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, do not allow to have clearance. When large amounts of interference, can use oil bath heating or heating method of rolling bearing to install sensors, bearing heating temperature range of 80 ℃ - More than 120 ℃, 100 ℃, the highest can't. At the same time, nut or other appropriate method is applied to tighten the bearing, in order to prevent the bearing width after cooling contraction and make the clearance between the ring and the shaft shoulder. Appropriate TIMKEN bearing installation dominated the bearing life, accuracy and performance, bearing before installation, check carefully the following points. If the bearing since before the installation need acceptance or any other reason and not for packaging, can adopt the following method: choose to clean, dry place bearing, and maintain the required tools and table clean. For grease lubrication, you may feel with new bearing grease is not clean. If the bearing small or used for high speed, no matter it is to use oil or grease lubrication, please use kerosene cleaning roller bearing or warm light oil removing rust inhibitor. However with seals or dust cover the bearing must not cleaning and heating.