With the magnitude of the use of maintenance of main bearing for HSM

Mills in 2020 - the importance of main bearing maintenance 04 - 10 Qiao Chunxu mills are usually choose family bearing four row cylindrical roller bearing, rolling bearing general requirements for the machining accuracy of P6, clearance within the scope of the C4 group, rotating accuracy level P5 for technical requirements, precision of the rolling element processing grade Ⅲ + above. Hot rolling bearing lubrication lubrication oil and gas or grease lubrication, etc. Oil and gas lubrication method is better than that of grease lubrication, grease lubrication beyond in prolonging the service life of bearing grease lubrication 2 times to 3 times as much. Due to various reasons, strip on grease lubrication is mainly USES the way of lubrication. Under discussion here with high quality lubrication of wire rod rolling mill bearing maintenance. Figure 1 & amp; Figure 2 above can be seen from the surface of the bearing, bearing because when the machine is running bearing seat o-ring seal aging or other reasons cause bearing internal water and slag. Bearing internal can strip the water bearing grease and make into a large scale or rolling bearing inner cavity residue, the bearing damage in advance of a factor. Figure 3 & amp; Figure 4 above traces of bearing inner ring is a typical crack, the main reason for the damage caused interference roll diameter is too big or too small, too much interference can hold split inner ring, and interference is too small will be the inner ring on the roll and roll diameter at work to produce relatively peristalsis, caused by stress concentration but inner ring crack. Figure 5 & amp; Figure 6 figure 6 is the damage of bearing outside diameter, the damage form and dimensional accuracy, form and position tolerances of bearing and installing a bearing has a direct relationship, the pounding of figure 5 is a bearing seat, the picture can clearly see that the deformation of the bearing, bearing seat like this at the scene of the hot rolling has a lot of, such bearing will cause bearing outside diameter fracture. Mentioned in the above damage form is broken only a very small, here is differ a narrative, the above bearing damage forms can be seen that the bearing maintenance and importance of bearing related accessories maintenance. So the bearing maintenance and accessories maintenance Suggestions as follows; 1) When the bearing assembly and disassembly bearings do not adopt the way of tapping, tapping can cause bearing guard fracture directly, even if not directly fracture can also cause bearing internal stresses are present on site, use the computer at work due to the role of internal stress, bearing work causes fracture. 2) Check the bearing inner diameter size precision and shape tolerance, pay special attention to detect vertical differential bearing inner hole. Test roll diameter size tolerance ( Look up the corresponding national standards) , roller diameter tolerance to control in the national standard range. 3) Have to check before installation bearing bearing seat o-ring seal without aging or being damaged. 4) Check whether there is burr and convex point bearing. 5) Bearing inner ring must adopt special heater heating installation, do not allow the electrode holder heating inner ring after installation. 6) Outside the installation components before daub on the inner wall of the bearing seat, a layer of lubricating oil. 7) Bearing internal grease to rotating roller components, to ensure that the grease into the outer raceway completely. 8) Check the bearing end cover mouth height, check the mouth height size decide whether can compress bearing components. The above points is just personal shallow Suggestions, welcome the industry added different Suggestions. （ Source: DMD_bearing)