The oil film bearing in rolling mill is smooth

1 working principle of the oil film bearing in rolling mill oil film bearing is a kind of smooth smooth oil as medium radial sliding bearing, its working principle is: in the process of rolling, due to the effect of rolling force, force the roller shaft neck attack move, the oil film bearing center and the center of the journal eccentricity, clearance between makes the oil film bearing and shaft neck constitutes the two areas, one is called divergence area ( Along the shaft neck rotation direction gradually become bigger space) And the other one is called convergence zone ( Along the shaft neck rotation direction gradually decrease) 。 When the rotating shaft neck of smooth with viscosity oil from divergence to convergence area, along the shaft neck rotation bearing clearance from large to small, form a kind of oil wedge, make smooth oil pressure. The oil film pressure along the rolling direction of each point in the resultant force is the bearing capacity of the oil film bearing. When rolling force is greater than the bearing capacity, the journal center and the increase of eccentricity between the oil film bearing center. Bearing clearance in the convergent zone along the shaft neck rotation direction change steep, the minimum oil film thickness decreases, the pressure inside the oil film and bearing capacity, until with rolling force reaches equilibrium, journal center no longer migration, oil film bearing and shaft neck complete separated by a smooth oil theory constitutes the whole fluid is smooth. From the working principle of the oil film bearing can know that the oil film bearing system is one of the most important parameters of the minimum oil film thickness. If the minimum oil film thickness value is too small, and smooth metal impurity particles in oil is too large, the shape of metal particles size on value is greater than the minimum oil film thickness, the metal particles with smooth oil after the minimum oil film thickness, like metal contact formation, serious when will burn. In addition if the minimum oil film thickness value is too small, when rendering pile the accidents such as steel, it is easy to form the shaft neck and the metal contact of the oil film bearing tile burning. The size of the minimum oil film thickness value and the structure of the oil film bearing size and data, the relevant parts of machining precision and installation accuracy of oil film bearing system, smooth oils, and the size of the rolling force and so on, As shown in figure 2-3 1) 。 Hence the scope change bearing pressure, impact resistance, speed, rolling precision request such as size, structure and use life. The rolling pressure, rolling speed, bearing clearance, and smooth oil viscosity match four elements constitute the stability of discontinuous bearing oil film, smooth completion fluid dynamic pressure, in order to meet the mill in different operating conditions of friction and smooth. So the oil film bearing is smooth, often in the following three ways: ( 1) When starting or stopping, although there are smooth between shaft and bearing oil, but as a result of movement speed is equal to zero or near zero, the hydrodynamic pressure has not yet form or gradually faded, smooth shaft and the bearing will be in direct contact, at this point in smooth edge interface that is half dry friction condition. ( 2) Due to excessive vibration or water or oil supply deficiency or there is a problem of oil could produce mixture is smooth. ( 3) Mill functioning smoothly, the fluid is smooth. Therefore, smooth features of oil film bearing is a mix of smooth alternations between these three conditions. 2 of the oil film bearing in rolling mill is smooth oil characteristics to adapt to high speed, heavy iron and steel enterprise, automation, the demand of large scale and high yield, solve the smooth request of oil film bearing in rolling mill, meet the increasingly harsh working conditions, to smooth the oil used in the oil film bearing in rolling mill had the higher request. Smooth feature of oil film bearing in rolling mill, the resolution to the smooth oil must meet its using performance request, can guarantee the normal operation of rolling mill and continuous consumption. Therefore, smooth oil should possess the following properties: ( 1) Good viscosity-temperature properties ( High viscosity index) , when the bearing temperature fluctuations can still complete the smooth part of the normal and smooth. ( 2) Superior demulsification performance ( Which can be divided into water based) , in the long-term use can rapid moisture oil separation. ( 3) Good anti-wear and extreme pressure properties, oil mixed with a small amount of water during operation, still can form the oil film persistence overloading and anti-wear properties. ( 4) Good antiwear, antirust and antifoam performance, avoid smooth system to produce corrosion, blocking oil, forming wear and lack of oil. ( 5) Good oxidation stability, cleaning and filterability, smooth smooth oil system, guarantee the smooth and normal.