Analysis of the Influence of Grease Viscosity on IKO Rolling Mill Bearings

    The measure of internal friction during material activity is called viscosity. In order to prevent the contact surface between moving parts, the bearing lubricant must have sufficient viscosity, and the viscosity value decreases with increasing temperature. Viscosity is an important physical and chemical performance index for evaluating the quality of IKO bearing lubricants. It is of great significance for production, transportation and use.
Viscosity is the main technical index of bearing lubricants, but the viscosity of IKO bearing lubricants should not be higher than the degree that affects the start of the engine. Most bearing lubricants are classified according to their viscosity, and the viscosity is the oil of various equipment. mostly according. The measurement of viscosity is divided into two categories: absolute viscosity and relative viscosity. Absolute viscosity is divided into dynamic viscosity and kinematic viscosity; relative viscosity has several expressions such as Enshi viscosity, Sai's viscosity and Rayleigh viscosity.
The use of excessively large rolling mill bearing lubricants will increase the wear of the machine. In practical applications, the selection of lubricants of suitable viscosity will ensure that the mechanical equipment works normally and reliably. Generally, for low-speed and high-load applications, oils with higher viscosity are selected to ensure sufficient oil film thickness and normal lubrication. For high-speed and low-load applications, oils with lower viscosity are selected to ensure the normal starting of mechanical equipment. The running torque, the lubricating oil of the engine is too large, the activity is slow, the upstream is slow, and the oil pressure is high, but the lubricating oil passes through a small amount, and cannot be added to the friction surface in time, and the friction generated under the condition of continuous operation is the smallest.
    Because the rolling speed of the rolling mill bearing oil is slow, the number of passes through the bearing lubricating oil filter is small, and it is difficult to clean the worn metal chips, carbon particles and dust from the friction surface in time. In operation, because the viscosity of the lubricating oil is large, the friction between the friction surfaces of the parts increases, and in order to overcome the increased friction, the fuel is consumed more, and the output power of the engine is also reduced. IKO bearing lubricants have high viscosity, and the oil's cycle speed is slow. The cooling and heat dissipation effects are poor, which makes the engine overheat. The temperature rise is small so that an oil film can be formed between the moving parts at various operating temperatures.
Therefore, do not use excessively strong engine oil, let alone think that the viscosity is as high as possible. Under the premise of ensuring lubrication, depending on the temperature range at the time of use, use a lubricant with a small viscosity as much as possible. However, for the engine that has been worn to a serious degree and the gap has been relatively large, a lubricant having a slightly higher viscosity can be appropriately selected.

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Standard method and lubrication maintenance for installing IKO railway bearings

Since IKO bearings are rust-proofed and packaged, do not open the package until installation. In addition, the anti-rust oil coated on the bearing has good lubricity. For general-purpose railway bearings or grease-filled bearings, it can be used without cleaning. However, for instrument bearings or bearings for high-speed rotation, the cleaning oil should be washed with a clean cleaning oil. The bearing is prone to rust and cannot be placed for a long time.
Clean the bearing and the casing to confirm the burrs left by scratches or machining. There must be no abrasive (SiC, Al2O3, etc.) sand or chips in the outer casing.
Secondly, check whether the size, shape and processing quality of the shaft and the casing are in accordance with the drawings.
The method of installing the IKO bearing depends on the matching, condition and structure of the railway bearing. Generally, since the shaft is mostly rotated, the inner ring needs an interference fit. Cylindrical bore bearings, press with multiple presses, or use hot charging methods. For taper holes, mount directly on the taper shaft or with a sleeve.
When installed in the outer casing, the general clearance fits a lot, and the outer ring has an interference amount, which is usually pressed by a press or a cold shrink fit method after cooling. When dry ice is used as the coolant and the shrinkage is installed, the moisture in the air will condense on the surface of the bearing. Therefore, appropriate rust prevention measures are required.
Just close the packaging bearing before installation. Generally smooth grease is smooth, not clean, and directly adds smooth grease. Smooth oil, generally not clean, but use instruments or high-speed bearings and clean with clean oil to remove the rust inhibitor applied to railway bearings. Remove the bearing, rust and rust inhibitor, we can't open it. In addition, it has been sealed up, the VTC grease bearing, not washed directly. The mounting method of the bearing differs depending on the bearing layout and the premise. Generally, more shafts are twisted, and the inner ring nuisance is suitable for the request.
The fit of the IKO bearing to the shaft is generally a transition fit. The fit between the race and the housing bore is generally a clearance fit. Therefore, the bearing is easier to install. The center shaft of the two-way thrust bearing should be fixed on the shaft to prevent relative The shaft rotates. The installation method of the railway bearing is generally the case where the shaft rotates. Therefore, the cooperation between the inner ring and the shaft is a win-win cooperation, and the cooperation between the outer ring of the bearing and the bearing chamber is a clearance fit.

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