SKF bearing limit speed and noise processing method

( 1) Imported bearing raceway groove sound sound and its control method is when bearing is running, rolling on the surface of the raceway of the rolling element and a line of continuous sound, is unique to occur in all rolling bearings of the basic sound. General bearing ring raceway is combined with other sounds. Ball bearing raceway is irregular, frequency above 1000 hz, its main frequency does not change with speed, but its total sound pressure level increases with speed to speed up. Raceway large bearings, the rolling sound of sound pressure level decrease with the increase of the viscosity; The raceway small SKF bearing, the sound pressure level in the viscosity increases to about 20 was/s above, from decreased to increase somewhat. And the rigidity of the bearing, the greater the raceway of the lower the total sound pressure level. Such as radial clearance is too small, the total sound pressure level and race master frequency will increase sharply with the decrease of radial clearance. Control of raceway acoustic methods are: using low noise bearing is bearing waviness is very small, that is, carefully select and use conditions. Race often affect the mechanical noise, reduce the raceway can reduce the mechanical noise. ( 2) Impact of the rolling element and its control method for larger models of ball bearings or cylindrical roller bearings under pure radial load speed, due to centrifugal force is lesser, roller in the rolling body will impact the load area or race and making noises. But with the increase of rotational speed, the noise will disappear. Control method of rolling body impact sound: decrease the radial clearance, materials for use with reasonable structure and flexibility of the bearing cage. ( 3) Rolling mill bearing of rolling mill and its control method is cylindrical roller bearing in the harsh metal can occur in all occasions, mostly happens in the larger model SKF bearing grease lubrication, and in the base oil performance degradation occurred more often in the grease, almost does not occur when oil lubrication. In addition, more easily occur during the winter, when under pure radial load, the radial clearance prone to big occasions, and with different size, easy to happen in a certain speed range, both continuous and intermittent. External ring raceway take special processing method can prevent the occurrence of roll ring, can choose this kind of bearing, if necessary or appropriate to reduce bearing radial clearance, the use of high performance grease and improve to suit the bearing parts of rigidity. Method of bearing lubrication is roughly divided into two kinds of grease lubrication and oil lubrication. Give full play to the function of bearing, important is to use way and use, the lubrication method. Table 4 - 2 shows grease lubrication and oil lubrication advantages and disadvantages. Three, grease lubrication grease is composed of base oil, thickener and additive of lubricants. When the choice, should choose to use condition is very suitable for bearing grease, trademark is different, also there will be a very big difference on the performance, selection, must pay attention to. Bearing grease is commonly used sodium calcium base grease, grease, sodium calcium base grease, lithium grease, aluminium base grease and molybdenum disulfide grease, etc. In SKF bearing grease filling quantity, with a 1/2 - bearing internal space A third as appropriate. When high speed should be reduced to one third. Too much grease will lead to higher temperature rise. Four, grease working temperature grease, main indicators should be drop point, oxidation stability and low temperature performance, drop point generally can be used to evaluate the high temperature performance, bearing the actual working temperature should be lower than 10 - drop point 20℃。 Synthetic grease temperature should be lower than 20 - drop point 30℃。 Choosing grease, bearing load of heavy duty should choose small grease penetration. Work under high pressure in addition to the penetration of small, have high oil film strength and extreme pressure properties. Environmental conditions choosing grease, calcium base grease is not easy to dissolve in water, suitable for dry and less moisture environment. Five, the lubrication under the condition of high speed, high temperature, lubrication has not timely lubrication can be used. Oil circulation, can take a lot of calories. Viscosity is an important feature, lubricating oil viscosity size directly affect the oil forming oil film thickness between liquidity and friction surface, bearing lubricating oil viscosity is usually 12 - working temperatures 15cst。 The more speed Gao Yingxuan lower viscosity, load weight should choose high viscosity. Commonly used lubricating oil machine, high-speed machine oil, turbine oil, compressor oil, transformer oil, cylinder oil, etc. Oil lubrication methods include: a. Oil bath lubrication is the most common lubrication method, suitable for low and medium speed bearing lubrication, bearing part of leaching by the slot, the lubricating oil by rotating belt, SKF bearing parts and then flow back to the oil level of oil tank should be slightly less than the minimum rolling body center. b。 Oil drip lubrication is suitable for need to ration oil bearing parts, drip oil every 3 - general A drop of it is advisable to 8 seconds, too much oil will cause the bearing temperature increased. c。 Circulating oil lubrication oil filter in the oil pump to the bearing parts, bearing lubricating oil filter cooling after use. Circulating oil can take a certain quantity of heat, cooling the bearing, therefore method is suitable for high speed bearing parts. d。 Spray lubrication with dry compressed air after the sprayer and lubricating oil mixed form oil mist, spray bearing, can effectively make the SKF bearing cooling airflow and can prevent intrusion. This method is suitable for high speed and high temperature lubricating bearing parts.