As an important part of mechanical equipment, bearings are related to the normal operation of the equipment, and whether the correct installation of bearings is related to the service life of the bearing, so we must pay attention to it. This article tells you the 5 steps of the correct installation of bearings, and attach several common bearings installation instructions.
5 Installation steps
1. The use of advanced installation tools for bearing installation and disassembly can avoid bearing damage caused by improper tools and operation during installation. For example, when installing bearings, the staff used the copper rod tapping method, which is easy to cause the uneven axial force of the bearing, causing the deformation of the cage, the rolling body is damaged, and the clearance becomes larger, and the copper powder flies into the bearing cage during the tapping process, which is easy to cause the bearing failure.
2. Check the bearing before installation. For old bearings, check whether there are burrs, scratches and cracks on the surface of the ball (column). If the radial clearance and axial clearance of the old bearing are qualified, generally only the radial clearance is measured. For new bearings, first check whether the bearing model is correct. For example: Model 6318 deep groove ball bearing, bearing inner diameter 90mm, its radial clearance range of 0.016 ~ 0.046mm, can also be found that the maximum bearing wear of 0.25mm.
3, check the size of the bearing and the rotor shaft when the motor is assembled, it is also necessary to carefully check the size of the bearing and the rotor shaft when the bearing is installed, and the size of the bearing outer ring and the end cover hole.
4. Control the quantity of bearing and bearing oil in the bearing room too much oil in the bearing and the box will cause the bearing rolling body to slip, causing the rolling body to change from rolling friction to sliding friction and damaging the bearing rolling body. Due to the excessive amount of bearing oil and the small free space in the bearing box, the running temperature of the bearing will rise, the lubricating film of the rolling body will become thinner and the lubrication conditions will be poor, which is easy to cause bearing abnormal sound and surface slip. Shorten the life of bearings. In the actual work process, for bearings running at high temperature and high speed, bearings with sealing surfaces should be used as little as possible, the amount of oil stored by the electric oil cap should be increased, and the refueling nozzle should be installed, which can improve the operating life of the motor bearing.
5, pay attention to ensure good insulation for bearings with insulation design, pay attention to ensure good insulation. If the bearing insulation is destroyed during installation, the very thin bearing oil film will be broken down by the shaft voltage. After the oil film breakdown, the lubrication condition of the rolling body will not only be poor, but also the electric spark generated will form electrical corrosion of the bearing rolling body, causing the surface of the rolling body to accelerate the wear of the bearing.
Installation instructions for 7 kinds of bearings
Rolling bearings and angular contact ball bearings
1. When installing bearings, the force should be uniform and cannot be directly hammered. If the interference is large, the bearing should be heated in the air heating furnace with automatic temperature control, and the heating temperature is strictly controlled below 120°.
2. Bearings equipped with nylon cages can work continuously and stably at -40°-120° for a long time, and should not work for more than 4 hours at 150°, and the short-term temperature peak can reach 180°.
3. The warehouse where bearings are stored should be clean, dry, not allowed to be stored with chemical products in the same warehouse, the relative humidity should not exceed 65%, and the bearings are not allowed to be stored on the ground. In addition to the above 3 points, the deep groove ball bearing is the same as the rolling bearing and angular contact ball bearing, and attention should be paid to the fourth point: the stock bearing should be re-cleaned every other year for anti-rust packaging.
Self-aligning roller bearings
1. The user should select the appropriate fit and radial clearance of the bearing according to the requirements of use. Please check the bearing code first after unpacking. 2. Before bearing installation, if grease needs to be added to the bearing, the grease must be clean and appropriate.
3. During installation, it is appropriate not to directly hammer the inner and outer ring end faces and rollers, so as not to crack the inner ring or guard edge. Usually, the user should immediately install the spindle when the bearing is heated to 90°-100°. Avoid using local spray firing method for bearings, when it is difficult to “hot load”, users should also use special sleeves to install.
4. There should be good sealing and dust-proof device and lubrication conditions in the use of bearings, and the oil can not be cut off.
5. Bearing warehouse should be clean and dry, no environmental pollution, bearing stacking without landing, packaging without damage. Bearings in stock for more than 1 year must be cleaned and oiled again.
Thrust aligning roller bearing and thrust ball bearing
1. When installing bearings, the bearing oil seal should be cleaned and then coated with clean high-quality lubricating oil.
2. When installing the bearing, it should be stressed evenly and cannot be hammered. If the interference is large, the bearing should be heated to 90°-100° and installed immediately.
3. The warehouse where bearings are stored should be clean and clean, and the relative humidity should not exceed 65%.
4. The stock bearing should be re-cleaned and oiled every other year, and the oil seal packaging should be kept in good condition.
5. When using bearings, there should be a good sealing and dust-proof device, and the working condition should be checked frequently.
Cylindrical roller bearings
1. The bearing is separate type, the user can adjust the clearance according to the need.
2. Bearings should be cleaned with gasoline or kerosene before use and kept well lubricated.
3. When the bearing is installed, the bearing should be pressed into the part, and it is strictly prohibited to knock.
4. The bearing storage place should be clean and ventilated, avoid moisture, and bearings that need long-term storage should be regularly rust-proof.
Post time: Jan-09-2025