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A, accurate installation of precision bearings
For the installation of precision bearing products to install them is over to pay attention to some things, if it is not installed, make the bearing life is not long. So in order to install the bearings, then you should know to install the bearing, so as to ensure the bearing damage during installation. Following me to the first volume of the bearing mounting accuracy calibration method:
1, measuring the size of the shaft and the housing bore to determine with precision bearings with the requirements are as follows,
(1) the inner ring and the shaft to take an interference fit, the amount of interference 0 ~ +4 μm (at light load, high-precision, 0);
(2) the outer ring and bearing hole to take a clearance fit, the amount of backlash from 0 to +6 m (free bearings angular contact ball bearings, but also increase the gap);
(3) axis and the surface of the bore roundness error of 2 uM
(4) of the bearing parallel to the end surface of the spacer in the 2μm
(5) the shaft shoulder side facing the outer end of the beating 2 uM
(6) bearing hole shoulder block axis beating 4
(7) the spindle inside the front cover side facing the axis of beating 4,
B, rust-proof method
Rust of the surface pretreatment methods:
1) Surface cleaning: cleaning must be in accordance with the nature of the rust-proof surface and then the premise of the appropriate method is selected. Commonly used solvent cleaning, chemical processing, cleaning and mechanical cleaning method.
2) the surface of the cleaned and dried the availability filtered clean dry compressed air dry or dried with 120 to 170 ° C. The dryer can also be used for dry clean gauze.
Coated with anti-rust oil
1) immersion method: some small bearings using immersion in anti-rust oil, let it surface adhesion layer of anti-rust oil. The oil film thickness can be achieved through the control of the antirust oil temperature or viscosity to.
2) brushing method for non-soak or spray outdoor construction equipment or special shape products, brushing is necessary to pay attention to no accumulation, but also pay attention coated to prevent leakage.
3) spray method of large-scale anti-rust can not be the immersion method oiled, generally about 0.7Mpa pressure filter compressed air spray in the air cleaner place. Spray method combined solvent-diluted anti-rust oil or a thin layer of anti-rust oil, but must improve fire safety and labor protection measures.
Bearing installation accuracy, affecting accuracy, longevity, functional. Therefore, the design and assembly of components for the installation of the bearing to be adequately studied. I hope to be installed in accordance with the scale of homework. The homework-scale projects are usually as follows:
(1), cleaning parts of bearings and bearing contact relationship
(2) Check the contact relationship between the size of components and finishing
(3), which installation
(4) Install the bearings after the check
(5), supply lubricant
Hopefully period of nearly Before installation, just open bearings packaging. General grease lubrication, cleaning, filling the grease directly. Lubricating oil, Common also do not have to clean, however, the instrument used or the use of high-speed bearings, etc., use of clean oil washed to remove the anti-rust agent coated on the bearing. Remove the bearing of rust inhibitor, rust, and so can not be placed regardless. Furthermore, the grease-enclosed bearing, used directly without cleaning.
The method of installation of the bearing, because the bearing structure, with the premise varies, ships, because of the multi-axis rotation, the inner ring needs interference fit. Cylindrical bore bearings, multi-purpose pressed into the press, or hot charging method. Taper occasions, installed directly on the taper shaft or sleeve installation.
Usually clearance fit when mounted to the housing, the outer ring with the amount of interference, usually pressed into the press or shrink fit method installed after the cooling. Cooled with dry ice
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