Reasons for natural wear of bearings

Upload Time:

2022-11-16

Oxidation wear. The small peaks and valleys on the surface of the relative motion of the bearing are synthesized with the oxidation in the air to form a brittle oxide that is not firmly bonded to the base metal. The oxide is easy to fall off during friction, and the resulting wear is called oxidative wear.

The specific reasons for the natural wear of bearings are mainly as follows:

The tiny peaks and valleys on the friction surface squeeze each other, causing the brittle surface to gradually fall off and wear away.

①Oxidation wear. The small peaks and valleys on the surface of the relative motion of the bearing are synthesized with the oxidation in the air to form a brittle oxide that is not firmly bonded to the base metal. The oxide is easy to fall off during friction, and the resulting wear is called oxidative wear.

② Friction heat and wear. When the bearing works under the conditions of high speed, heavy load and poor lubrication, the peak and valley of the outer surface will generate high temperature due to friction, the hardness and wear resistance of the contact point will decrease, and even adhesion and tearing will occur. This wear is called frictional heat wear.

③Hard grain wear. If the bearing is in relative motion, the surface structure of the bearing is uneven, there are hard particles, or sand, friction, chips and other impurities fall into the moving surface of the bearing, during the relative motion of the bearing, the hard particles or impurities will make the bearing surface Scratches and even grooves are called grit wear.

④ pitting wear. Gears, bearings and other rolling contact surfaces are periodically subjected to a large 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.

Cause rust or corrosion, wear caused by chemical corrosion. The surface of the bearing is corroded by acid, alkali, salt liquid or harmful gas. The wear process is accelerated, which 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 action.

Corrosion damage due to temporary contact with liquids such as water, acids, alkalis, salts or harmful gases: non-moving bearings on equipment. Damage caused by rust or corrosion is called corrosion damage.