Coupling repair and concentric knowledge

　　The friction of the coupling causes damage and damage to the moving surface. At this time, the shaft surface is blue.If the lubricating oil fails or the pressure cannot be built up, the moving surface will lose the protection of the oil film and directly contact for dry friction.In addition to economy, the repair of couplings is also technical. This requires the repairer to fully understand the corresponding technical requirements of the bearing, and the characteristics of the structure, process and material of the bearing and its parts. Otherwise, it is difficult to guarantee the bearing. The repair has a satisfactory effect.The main material factors that affect the service life of high-carbon chromium steel rolling bearing parts and the degree of control are. (1) For GCr15 steel after quenching, it is required to obtain a microstructure of cryptocrystalline martensite with an average carbon content of about 0.55%, about 9% of Ar and about 7% of undissolved carbides in a uniform and round state.This kind of microstructure can be controlled by quenching heating temperature and time. : (2) The carbides in the original structure of steel before quenching are required to be fine and dispersed.High temperature austenitization at 630°C or 420°C can be used. Forging and rolling waste heat rapid annealing process can also be used to achieve. The alloy layer of the bearing bush melts when the temperature rises, and the phenomenon of "holding bushing" occurs when the machine is stopped in time. If the machine is not stopped in time It will cause serious damage to the parts.Certain types of bearings that are really hard to buy have no spare parts and have to be repaired after failure, especially imported bearings; bearings have minor damage, such as slight water rust during storage, and slight fretting abrasion during transportation. It is a pity that this type of situation is easy to repair and discard.
　　Coupling is a component that connects two shafts axially and transmits torque and motion, and has the ability to compensate for the offset of the two shafts.On this basis, the coupling must be concentric.From a mechanical point of view, the coupling is stressed. The motor drives the coupling to rotate after powering on, and then the coupling drives the device to rotate. For couplings, concentricity is very important, otherwise It will affect the motor, etc.In the mechanical transmission, the coupling is to reduce the vibration of the mechanical transmission system and reduce the impact peak load. It should also have cushioning and shock absorption performance, and sometimes also have the function of overload protection, and the coupling is concentric, the motor power consumption is normal, and the transmission The efficiency will be very high; if the power loss increases when the coupling is not centered, the transmission efficiency will be reduced, and the current of the motor will naturally increase. This will eventually lead to the consequence that the motor may be burned.