Bearing grease with skill, four steps help you to do it

Bearing grease with skill, four steps to help you do it! 1. Choose the consistency level according to the international association of grease, NLGI) Standard, the grease is divided into different grades, high consistency grease stearic, is listed as one of high level NLGI, low fat and low consistency grease namely soft as NLGI level. According to this standard, recommended in the application of rolling bearing used in the three level of consistency, here are some guidelines: - In the ordinary bearing grease is most common in the application of NLGI2 level. - Low consistency level rolling bearing grease, i. e. , the level is divided into NLGI1 grease, when the environment temperature is low and small vibration 'preference. - For vertical shaft with large bearing or bearing configuration, high temperature or vibration ', it is recommended to use grease NLGI3 level. 2. Determine the viscosity of base oil required detailed information about the base oil viscosity, please refer to the bearing comprehensive record of the section 'lubrication'. Samples of curve is based on the full oil film under the conditions of elastic fluid lubrication theory ( EHL) 。 Most of the grease lubricated bearing, rolling element and raceway contact area only traces of lubricant. So oil film thickness is thinner than EHL theory calculated value. - When these curves are used to determine viscosity of grease lubrication base oil for precision bearing ', it is necessary for very low and very high viscosity. According to the practical experience, to 40 ° C adjustment is as follows: 'the required viscosity v - When v< 20 was/s ', multiplied by the coefficient of viscosity 1 - 2. Within the scope of the low viscosity, the oil is too thin to form enough oil film thickness. - When was 20 / s< v< 250 was/s ', without modifying coefficient. - When v> 250 was/s ', please contact the mall. 3. Verify the existence of extreme pressure additive if precision bearing must withstand overload ( P> 0. 15C) , impact load or in the working period, frequent start and stop, may use grease with extreme pressure additives. Only in the necessary 'with extreme pressure additives of lubricating grease, because some additives have adverse effect, such as some extreme pressure additives are not always compatible with bearing material. 4. Check supplementary requirements if there is some important operation, the performance of the grease should be can be added to these conditions. Provide the following Suggestions as a guide: - In order to good waterproof, consider using calcium base grease of thickening agent and without lithium base thickener fat. - In order to good dust protection, choose the appropriate additive. - If the vibration level is higher, select grease with high mechanical stability. Work under high speed precision bearings apply a small amount of lubricating grease. Just add grease lubrication for the bearing in the running-in period should work under low speed. This makes the grease evenly distributed in the bearing. If ignore the running-in period, the dramatic increase in temperature, can make the bearing failure in advance. Application in machine tool bearings, basically all is under high-speed operation, grease filling quantity should be below 40% of free space in the bearing. Fill in the amount of fat should be used according to different situations. But remember: the more complete fat, the longer the running-in period. According to the experience in this field, the most common filling grease quantity about 10 ° % of bearing free space. Suggest using table 1 provides the amount of grease filling precision angular contact ball bearings, thrust bearings and cylindrical roller bearing. Fill the amount in 10 ° % - basically Between 15 ° %. Seal of angular contact ball bearings provide standard grease type and filling quantity. According to the requirement, also can provide other types and filling quantity of bearing grease.