A rolling mill oil film bearing lubrication

Oil film bearing is a slide bearing family, in working condition, in a full fluid lubrication. It is the use of a fluid film bearing hydrodynamic lubrication theory, namely by the relative movement of the shaft and bearing components, fluid viscosity and lubricating oil by means of wedge-shaped gap formed in the bearing deputy in the dynamic pressure, and the formation bearing oil film bearing .

Also known as pressure oil film bearing oil film, which serves to balance the load, isolation journal and bushings, the solid friction between the metal into liquid molecules inside friction, friction and wear to a minimum, which can maximum in the range meet the bearing pressure, impact resistance, changing the speed, precision rolling, structure, size and service life requirements.

According to Reynolds equation design, rolling pressure, rolling speed, bearing clearance and lubricant viscosity match the four elements, the formation of stable continuous bearing oil film to achieve hydrodynamic lubrication, friction mill to meet under different operating condition and lubrication; that is, start, stop, forward, reverse transformation is semi-dry friction and friction lubrication mediated side, in the shock load or a lot of water in the mixed friction lubrication in normal operation and full load, continuous operation time liquid friction and lubrication. So film bearing lubrication, often show the following three forms:

(1) start or stop, even though the shaft and bearing lubricants, but because of the velocity is equal to zero or close to zero, hydrodynamic lubrication has not been formed or gradually disappear, inevitable in direct contact with the shaft and bearing, this time in the side-mediated or even semi-dry friction lubrication state.

(2) rolling mill operation, due to the generation or supply shock or too much water or not enough oil in question are likely to produce mixed lubrication.

(3) when the mill is operating normally smooth, showing fluid lubrication. Therefore, the lubricating oil film bearing the features of the three scenarios is mixed lubrication alternately exist.

To meet the high-speed steel enterprises, heavy, automation, large-scale and high-yielding need to address oil film bearing lubrication requirements, to meet the increasingly demanding working conditions, rolling mill oil film bearing lubricating oil - bearing oil film came into being.

Second, the use of performance requirements of the oil film bearing oil

Lubricating oil film bearing characteristics, determines the bearing oil film must meet performance requirements before they guarantee the normal operation of the mill and continuous production, therefore, bearing oil film need:

(1) Excellent viscosity-temperature properties (high viscosity index) when significant changes in bearing temperature, can still achieve the normal lubrication of the various parts of the lubrication.

(2) superior anti-emulsifying properties (ie, water points), in the long-term use can quickly separate the oil in the water.

(3) good anti-wear and extreme pressure performance, mixed with a small amount of oil during operation of water, to form a film still holds the reload and abrasion resistance.

(4) good anti-wear, anti-rust, anti-foam properties prevent lubrication system from corrosion, clogging oil, resulting in lack of wear and oil.

(5) good oxidation stability, cleaning properties and filtration. Make the oil flow lubrication system to ensure the normal lubrication.