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Reasons for natural wear of bearings
The specific reasons for natural wear of bearings are mainly as follows: The tiny peaks and valleys on the friction surface squeeze each other, causing the brittle surface layer to gradually fall off and wear.
Sep 17,2024
The specific reasons for natural wear of bearings are mainly as follows:
The tiny peaks and valleys on the friction surface squeeze each other, causing the brittle surface layer to gradually fall off and wear.
① Oxidation wear. The tiny peaks and valleys on the relative motion surface of the bearing are synthesized with the oxidation in the air to form brittle oxides that are not firmly bonded to the base metal. The oxides are very easy to fall off during friction, and the wear that occurs is called oxidation wear.
② Frictional heat wear. When the bearing works at high speed, heavy load and poor lubrication, the peaks and valleys on the surface generate high temperatures due to friction, the hardness and wear resistance of the contact points decrease, and even adhesion and tearing occur. This kind of wear is called frictional heat wear.
③ Hard particle wear. If the bearing moves relatively, the surface of the bearing is uneven, there are hard particles, or sand, friction chips, chips and other impurities fall between the moving surfaces of the bearing, the hard particles or impurities will scratch the surface of the bearing or even form grooves during the relative motion of the bearing. This kind of wear is called hard particle wear.
④ Pitting wear. The rolling contact surfaces of gears, bearings, etc. are periodically subjected to great contact pressure during the relative process. After a long time, fatigue occurs on the metal surface, causing tiny cracks and erosion on the bearing surface. This wear is called pitting wear.
Causing rust or corrosion, wear caused by chemical corrosion. The surface of the bearing is corroded by acid, alkali, salt liquids or harmful gases. Accelerating the wear process, this wear is called wear caused by chemical corrosion.
The metallographic structure or chemical composition of the metal changes, which reduces the wear resistance and hardness of the bearing surface and accelerates the wear process. This wear is called wear caused by high temperature.
Due to temporary contact with liquids or harmful gases such as water, acid, alkali, salt, etc., corrosion damage: non-moving bearings on equipment. Damage caused by rust or corrosion is called corrosion damage.
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