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With the rapid development of numerical control technology, composite, high-speed, intelligent, precision, environmental protection has become the main trend of today's machine tool industry technology development. Wherein the high-speed machining can effectively improve the machining efficiency and to shorten the processing cycle of the workpiece, which requires the machine tool spindle and its associated components to adapt to the requirements of high-speed processing. Similarly, the assembly in the high-precision high-speed CNC machining center spindle into to part precision bearings must meet the high-precision machine tools, high speed, low noise, trouble-free, high-reliability requirements. Precision bearing assembly a direct impact on the quality of their work status and service life, many CNC machining centers failure is caused by improper assembly of the INA bearings, precision bearing assembly technology should be given adequate attention. The high-speed precision bearing assembly points are summarized below.
A precision bearings removal and cleaning
Keep hands clean and dry
Precision bearings out of the package, the operator's hands should be kept clean and dry the hands sweat can cause rust, if necessary, wear gloves.
2 to ensure good lubrication effect
Remove the precision bearings shall immediately proceed to the assembly grease and oil coating processing, immediately after removal of the Fatliquoring precision bearings for pollution-free installation, no assembly grease and oil coating processing. Cage mounted grease the bearing outer ring gap must be added butter, precision bearing greasing to 30% of the cavity is better, high-speed precision bearing greasing to 20% of the cavity.
Packaging sealed
Precision bearings can only be removed from the original packaging and cleaning before assembly. Removed from the volatile corrosion inhibitor archived precision bearings packaging which sets the packaging seal, because the the VIC paper protective gas can only be maintained in a sealed packaging.
4. Cleaned properly
Fatliquoring precision bearings can not be cleaned before assembly, without added fat precision bearings must be cleaned before assembly after cleaning should be dried and immediately on the anti-rust oil or the installation of fat, in order to avoid corrosion. Following cleaning agents can be used: an aqueous cleaning agent - neutral, acidic or alkaline cleaning agent, the compatibility check alkaline cleaning agent in the cleaning before the aluminum parts; organic cleaning agent - acid degreasing and cleaning of precision bearings and anhydrous kerosene, benzine (motor gasoline), a substitute for Freon 12 or chlorinated hydrocarbon cleaning agents. INA bearing cleaning must be aware of the following: environmental protection, health and work safety; cleaner methods of operation must comply with the product description, in order to avoid a hazard.
B, precision bearing installation and installation tools
Spindle, screw with precision bearings as the basis of supporting parts of the machine, its performance directly affects the speed of the machine, rotary precision, rigidity, anti-chatter vibration cutting performance, noise, temperature rise and thermal deformation, thereby affecting the accuracy of the machined parts surface quality.
1 precision bearings Installation Notes
Precision bearing assembly site should be kept clean as much as possible; to avoid the precision bearings pollution or dust to enter the large adverse effects of pollutants on the operation and service life of the bearings; Check the bearing bore and shaft mating surface geometric precision, dimensional accuracy and cleanliness; installed in the ferrule mating surface coated with a little oil or a little fat, precision bearings easier to design to installation site; design bearing hole and shaft should have a 100 to 150 installation guide chamfer; Do not over-cooling INA Bearing, condensation can lead to corrosion of the bearings and bearing mating surface; bearing inner ring and spindle assembly requires the use of directed assembly method or angle matching method, which is artificially control the assembly runout direction, so that the error cancel each other out and not cumulative; bearings are pressed into flexible rotation sense block; installation is complete, check the precision bearing system is working properly.
Rational use of installation tools
(1) When a large amount of interference when the heating tank can be used, oil bath heating or induction heating bearing installation, the heating temperature ranges from 80 ° C to 100 ° C, can not exceed 120 ° C. High. At the same time, the application of nuts or other appropriate fastening INA Bearing, in order to prevent a gap between the bearing cooling width direction of contraction of the ring and the shaft shoulder.
(2) bearing installation, you must apply equal pressure on the circumference of the ring face pressed into the ferrule end bearings shall not directly hit the hammer first-class tools, in order to avoid injury. At room temperature in the case of a smaller amount of interference with the sleeve to hold down the end face of the bearing rings, the central portion of the sleeve assembly with the the hammer head light Chance evenly pressed into the ferrule through the sleeve. Assembly force is by no means through the rolling elements to pass to avoid direct hammer bearing rings. Press-fitting, should ensure that the shoulder end face of the outer ring of the end face of the housing, the inner end face of the shaft shoulder face pressed gap are not allowed.
(3) the use of mechanical presses or hydraulic machines must use the mounting sleeve press-fit, and at the state level, the bearing channel if inclined to cause damage due to power of the INA Bearing abnormal sound. The assembly sleeve full contact bearing inner ring or the entire circumference of the outer ferrule end face.
C, precision bearing removal
Designers precision bearing installation site should consider removing the problem, precision bearings under normal circumstances are selected interference fit, the shaft or housing bore should be set demolition trench design, in order to remove the bearing.
Dismantled precision bearings but also to re-use, disassembly process need to be carefully operation. Precision Bearing Removal should note the following: Avoid direct blow to the bearing rings; dismounting force should not be passed through the bearing rolling elements, removal from the shaft the precision bearings when dismounting force should be delivered by INA Bearing rings from the bearing hole demolition precision bearings when dismounting force should be passed through the bearing jacket; precision bearings once removed should be cleaned, oiled or dry installed grease processing, in order to avoid bearing by corrosion.
Note that the above point precision bearing assembly process, the the spindle temperature rise will control, high-speed high-precision spindle trouble-free operation, the transmission precision control play a more satisfactory results.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 4T-26885/26822 NTN | 41.275 | 79.375 | 25.4 |
| 4T-26882/26823 NTN | 41.275 | 76.2 | 25.4 |