Backing bearing roller end face and retaining ring scratch analysis

Backing bearing roller end face and scrape analysis 2018 - ring 08 - 23 backing bearings as many of the key parts in roller mill, directly affecting the service life of mill's reliability, security, and the quality of rolled plate. Due to the rotation of the bearing requirement precision to achieve P4 above grade, bearing need preventive maintenance, to ensure the quality of its use. When bearing inspection found that the first column roller end face and retaining ring appeared abnormal wear abrasion, analysis the reason for it. More than 1 way scraped mill with backing bearing structure as shown in the figure below, the outer ring double raceway carry penal, inner ring without guard, the inner ring on both sides of the flat collar, outside the cage guide structure. Backup roll bearing block installed in more mill on the spindle of fixed inner ring, outer ring spinning, lubrication method for emulsion lubrication, bearing mainly bear radial rolling force of mill roll pass. Bearing dismantling after observation, both inside and outside, in the outer rim and on the other side of the roller, the retaining ring and retainer are no exception, roller and ring and wear trace. （ The diagram below) 2 twenty mill roll system structure and force analysis is characteristic of rolling force from the work roll through intermediate roll to the backing of backup roll bearing, and eventually spread to solid overall frame. Roll system diagram as shown in the figure below. The structure of roll system deformation, can be in the entire width of rolling direction very precise thickness deviation of; Has the axial and radial roller shape adjustment, roller diameter dimension compensation, rolling line etc, and USES the hydraulic pressure and position automatic control system, so the product has good flatness, size precision is high. Backing bearing adopts double row cylindrical roller bearing, mainly used to bear radial rolling force. Roller end face and the outer rim and for surface contact between retaining ring. The bearing in only can bear radial load, low speed under the condition of ensuring the service life of bearing. Bearing only under a certain axial force can appear friction roller and retainer. 3 3 bearing abrasion reason analysis. 1 source of axial force in the process of practical work, in order to to control the strip shape of rolled plate, mill must, in accordance with the shape of the rolled plate material for adjust the position of the backup roll and middle roll changing work roll shape curve. 1) The influence of bending roll. Mill USES the radial roller adjusting mechanism, make the backup roll ( The backing bearings) The core of axial-radial a tilt Angle, the backing bearing axial force. 2) The intermediate roll shaft to move. In order to adjust the plate shape of edge, 2 middle roller in the roll of a crown, the asymmetry of roll, upper and lower two, on the other hand, the size of the roller head position can axial movement, so as to change the work roll shape curve. At this time of backing bearings produce axial drag force. 3) Roll system is not parallel. When any two contact in rolling mill roll system of roll axis rough lines, the contact part of the roll diameter can produce axial force. 3. 2 scratches because the original backing bearings only considered when the design is used to bear radial rolling force, the actual use, due to the bearing installation, manufacturing error and the influence of axial force, will lead to produce certain skew roller. Skew Angle depends on the roller of the ratio of axial and radial force, the greater the ratio, the greater the skewed Angle. When improve the rolling force, axial force of the bearing has greatly increased, skew roller, roller end face and the baffle ring chamfer contact, cause stress increase, lubrication conditions, to produce a large number of frictional heat, eventually led to the roller end face and the baffle ring friction and wear between traces. （ Wu Mengchuan jiangsu emperor mond rolling mill bearing)