The specific causes of natural wear of bearings are mainly as follows:
The tiny peaks and valleys on the friction surface squeeze each other so that the brittle surface gradually falls off and wears away.
Oxidation wear. The tiny peaks and valleys on the relative motion surface of the bearing are synthesized with the oxidation in the air to generate brittle oxide that does not firmly bond with the matrix metal. The oxide is easy to fall off in the friction, and the wear that occurs is called oxidation wear.
Friction generates heat and wear. When the bearing works under the condition of high speed and heavy load and poor lubrication, high temperature, hardness and wear resistance of contact point will occur at the peak and valley of the outer surface due to friction, and even adhesion and tear will occur. This wear is called frictional thermal wear.
Hard wear. If the bearing is in relative motion, the bearing movement surface organization is uneven, there are hard particles, or the bearing movement surface falls into sand, friction, chips and other impurities, the bearing in relative motion, hard particles or impurities will make the bearing surface scratches or even groove formation, this kind of wear is called hard wear.
Pitting wear. Gear, bearing and other rolling contact surface, relatively in the process of periodic contact pressure, long-term action, metal appearance fatigue phenomenon, so that the bearing surface of tiny cracks and denudation, known as pitting wear.
Wear caused by rust or corrosion or chemical corrosion. The bearing surface is eroded by acid, alkali, salt liquid or harmful gas. This wear process is called chemical corrosion wear.
The change of metallography or chemical composition of the metal reduces the wear resistance and hardness of the bearing surface and speeds up the wear process. This wear and tear is called wear and tear caused by high temperature.
Corrosion damage caused by temporary contact with liquids or harmful gases such as water, acid, alkali or salt: non-moving bearings on equipment. Damage caused by rust or corrosion is called corrosion damage.