The processing of bearing run laps

Deal with 2020 - bearing run laps 08 - 21 Wang Zhanguang ( Jiaozuo strong cement) Usually associated with shaft bearing, bearing inner sleeve and the shaft installed together, coat of the bearing and bearing installed together. If within the set of the shaft turn, the inner sleeve and the shaft adopts closely, using clearance fit coat of the bearing and the bearing body; On the other hand, if the bearing body with bearing a coat, the coat of the bearing and the bearing body adopts close coordination, and the bearing inner sleeve and axial clearance fit. Tend to run laps fault occurring in operation process, this needs analysis and processing, or it will cause accidents, causing significant losses. The reason why the run laps, bearing bearing run laps is a kind of common failures, run laps are many reasons. First is mismatch, we know that running bearings will produce heat, axis and inner sleeve, coat and bearing body there is a difference in temperature, the temperature difference causes with the changes of firmness, if closely bearing inner sleeve size is greater than the shaft diameter, with the extension of time, will generate wear, run laps is inevitable, and will send out more heat, the temperature of the bearing body will also rise, once the expansion of the bearing body, bearing clearance, bearing inside and outside is as a body, as the pivot, then, bearing a coat in the rotation of the bearing body, and generate a large amount of heat, the accident occurs, the bearing body of grinding inner hole is big. Is this the formation temperature difference caused by improper cooperate with elastic run laps. Secondly, vibration caused by run laps, if the equipment vibration is larger, the greater the bearing load bearing of east, shaft is like being in operation, over time, the shaft will be beat, journal and it destroyed the original firmness, formed the micro, fever, run laps, journal will fine grinding, bearing holes will be the big in the body. Third, the lubrication failure. Lubrication failure, the heat generated by the friction, bearing, bearing body inside and outside temperature difference is big, destroy the original size, bearing journal, bearing wear. Fourthly, improper lubrication even more impurities. When large grease hardness or impurities, will cause bearing rolling body cavity effect, stop rolling element has its own spin, friction heat, it will also drive the coat on the choice of bearing body, wear, when the resistance is bigger, the resistance can overcome the friction of the bearing inner sleeve on the shaft, the shaft from the inner sleeve slip, slide, causing wear and tear. Fifthly, improper installation. Said improperly installed is mainly refers to such as bearing heating temperature is exorbitant, bearing after expansion, size close not to come back; Left the free end of the shaft bearing clearance, bearing caused by lateral friction heat; Wash not clean bearings, shaft, bearing body, causing binding; Subdivision bearing seat comfort flattening bearing, bearing as well as the local binding conditions, these conditions will cause bearing heating, lead to bearing run laps. Its six, long-term vibration tapping, can make its shaft fatigue spalling, once the chips, inevitably cause loose, cause bearing run laps. Seventh, bearing failure. Long-term bearing of bearing raceway can produce some fatigue pitting, fall off pieces will have a cavity effect, once the fever, temperature difference at the same time, can cause run laps. Second, bearing run laps in the processing of analysis, there are many reasons for the bearings run laps, so when malfunction or accident, must analyze the reason, find out the root cause of the accident, and then according to the specific situation, take the appropriate measures for processing. Detailed introduction is as follows. 1, proofing method when bearing run laps, sure shaft big pores, can be in inside surface or bearing hole to avoid, and even playing some kind of punch, bumps on the to make up for the size change. So can temporarily solve the problem of operation. 2, brush plating method by electroplating, the metal chrome plating on the shaft and bearing body directly, restore the basic size. 3, dope method when the shaft by wear or bearing hole wear in the body, can cause bearing run laps, at this time can choose suitable metal bonding agent, filling in the contact area clearance, solve after solidification. In this reminder, adhesive can only be used in close coordination of contact surface. For example, along with the rotation of the shaft bearing inner sleeve, along with the wheel rotating bearing coat. 4, welding cutting through welding long flesh will wear and tear on the part of the fill, and then through the mechanical processing to the appropriate size, to resume the function of parts. But the law due to welding can make the material mechanical performance change, produce stress concentration, so should not be used in the stress sensitive components. 5, set set set set method is commonly used method, namely to avoid damage and joint part material processing down first, and then processing a set of set on the shaft and bearing body, again will cooperate with the surface processing to the appropriate size. This method need to pay attention to the strength of the set, and damage of shaft and bearing body. And so on. Conclusion is a useful method of bearing restored using above, special account, the key is to, the author analyzes the reasons of shaft, bearing, bearing wear, must eliminate these reasons, the result of processing, just can use for a long time, such as reducing vibration, good lubrication, improve the quality of bearing, etc. Due to the limited level, this paper does not place, please comment. Thank you very much! （ Source: wisdom cement)