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Without friction, locomotive wheels cannot "grasp" the track or transmit power through belts. However, excessive friction during movement can generate heat, leading to expansion and mechanical failures, especially bearings. If friction is severe, problems can occur. Friction issues with bearings: The manufacturer of the bearing seat introduces that friction depends on the smoothness of the contact surface between the bearing and the machine tool. If the two surfaces are rough, greater force is required for the two surfaces to move towards each other. However, friction only decreases to a certain extent with smoothness. Due to the increased electrostatic attraction between its atoms, the friction between two smooth surfaces does not actually increase depending on the surface area of contact between moving objects or the relative velocity of objects (within a certain range). However, it depends on the magnitude of the force that puts these things together. When an object moves on a horizontal plane, it will press down on the surface with a force equal to its weight, which is the force of gravity. The increase in weight leads to an increase in the resistance to relative motion provided to the contact surface. It is worth noting that the friction coefficient of the bearing seat manufacturer is the quotient obtained by dividing the force required to move an object to another object at a certain speed by the weight of the body. For example, if a force of 20 Newtons is needed to move an object weighing 100 Newtons to another horizontal body at a constant speed, the friction coefficient between these two materials is 20/100 or 0.2. Different materials come into contact and produce different results. For example, if a piece of wood is pushed onto the surface of wood, steel, and plastic, different resistance will be felt, and different friction coefficients must be calculated for each pair of different materials.
Below are some suggestions for selecting different materials for bearing seats. The bearing seat is mainly made of materials such as cast iron, cast steel, stainless steel, etc. 1. Cast iron: Economically cheap, but not durable. 2. Cast steel: durable and priced high. When using cast steel bearing seats, it is possible to damage other components in case of problems. 3. Stainless steel: used in areas with corrosion.
Due to the low friction and convenient maintenance of needle roller bearings, they are often used in mechanical applications. However, various problems often arise during operation, which require diagnostic techniques to help solve practical problems. 1. Vibration diagnosis technology. When diagnosing needle roller bearing faults, when fatigue peeling, indentation, or local corrosion occur on the working surface of its components, periodic pulse signals will appear during operation. This periodic signal can be received by sensors (speed type or acceleration type) installed on the bearing seat, and the fault of the needle roller bearing can be diagnosed by analyzing the vibration signal. 2. Ferrographic diagnostic technology. Wear particles are closely related to their working conditions. Lubricating oil with wear particles is subjected to a strong magnetic field, and under the action of the strong magnetic field, the wear particles precipitate on a ferrograph according to a certain pattern. The ferrograph can be qualitatively observed on a ferrograph microscope or tested on a quantitative instrument to determine the working condition of the needle roller bearing. The machine does not require disassembly; Low investment, good results; Early fatigue failure of needle roller bearings can be detected; Can conduct research on wear mechanism. 3. Oil film resistance diagnostic technology. The company introduces needle roller bearings with good lubrication. Due to the effect of oil film, there is a large resistance between the inner and outer rings. Therefore, by measuring the resistance of the inner and outer rings of the needle roller bearing, the abnormality of the needle roller bearing can be judged. The same evaluation standard can be used for different working conditions, but the diagnostic effect on surface peeling, indentation, cracks and other abnormalities is poor.
