Electric tools for daily use conventional troubleshooting methods of the bearing

Bearing is one of the common core of electric tool accessories, Dr Electric tools for bearing performance requirements are mainly low vibration noise, small friction torque, at the same time also requires bearing sealing performance is good. At present, with the development of electric tool industry, users of precision bearing products, performance, life and species diversity has demanded higher and higher, are not satisfied with the requirements for general general bearing, steering of high precision, low noise, long life product demand. Bearing failure is often the case in the process of operation, malfunctioned, judgment and processing is the key. For power tools, bearings use common faults are: 1. When bearing temperature is too high: institutions, installation of bearing parts allowed to have a certain temperature, when the hand touch body shell, should not feel hot as normal, conversely indicates that bearing temperature is too high. Cause analysis: ( 1) Quality does not conform to the requirements or metamorphism of lubricating oil, lubricating oil viscosity is too high; （ 2) The assemble tight ( Inadequate clearance) ； （ 3) Bearing assembly too tight; （ 4) Bearing race in internal rotation shaft or housing; （ 5) Too much load; （ 6) Bearing cage or rolling body fracture, etc. 2. Bearing noise: the functioning of the rolling bearing in the work to allow a slight noise, if you have any abnormal noise or excessive noise or sound, suggests that the bearing failure. Cause analysis: ( 1) Bearing inner and outer surface wear. Due to this kind of wear and tear, damage the bearing and shell, bearing and shaft cooperate relationship, lead to axis deviation from the correct position, when axis at high speed movement produces sound. When the bearing fatigue, its surface metal flake, also can produce sound make bearing radial clearance increases. （ 2) Bearing lubrication, forms the dry friction, and bearing broken etc all make abnormal noise. （ 3) Bearing wear loose after kuang, maintains a looseness damage, also can produce sound bearing damage. Rolling bearings to remove check, according to the damage of bearing bearing failure and damage reasons. 3. Metal raceway surface spalling: bearing roller and the inner and outer ring raceway surface under the role of the periodic pulse load, resulting in a periodic change of contact stress. When stress cycles after reaching a certain value, the rolling element bearings, their work within or surface produce fatigue spalling. If the bearing load is too big, can make the fatigue. In addition, the bearing installation is not straight, shaft bending, also can produce roll flaking off. Bearing raceway fatigue spalling can reduce the running accuracy of shaft vibration and noise in the organization. Import valve gate 4. Bearing burn: burn bearing the heat tint of raceway and rolling body. Burns is usually the cause of insufficient lubrication, lubricating oil quality does not conform to the requirements or metamorphism, and bearing assembly too tight. 5. Plastic deformation, the bearing raceway and roller contact surface appear uneven pits, bearing produce plastic deformation. The reason is bearing under static load or shock loading, local stress exceeds the yield limit of material on the surface of the work, this kind of situation usually happened in the low-speed rotation of the bearing. 6. Bearing race crack: cause crack of the bearing race may be bearing fit tight, loose foreign or bearing inner ring, bearing deformation, inclusive of installation of bearing surface processing etc. 7. Maintains a fracture: the reason is the insufficient lubrication, rolling body breakage and seat skew, etc. 8. Retainers metal adhesion on the rolling body, possible reason is that roller was stuck in a cage or insufficient lubrication. More than nine kinds of failure phenomenon is electric tool bearing common failure types, this paper respectively to parse the failure reason, if in operating electric tools in the future when you meet the above phenomenon, a careful analysis to solve them. A: bearing material next article: bearing used in the diagnosis of common cause noise increases