The essence of actual fit accuracy during installation of deep groove ball bearings
Release date:2018-06-04 17:02:12
In order to improve the accuracy of the TIMKEN bearings with the actual installation, it is impossible to use the measurement methods and tools of the bearing deformation. The cylindrical holes and the actual precise measurement of the surface size deep groove ball bearings, the inner diameter and the outer diameter can be used to measure all the items to be measured and the measured data are fully integrated. On this basis, the shaft and Kong Chi Precision bearings with position and position. The actual measured results are measured with the corresponding size and geometry of shaft and bearing hole, bearing should have the same temperature condition.
Return
The two direction indicator is intended to compensate for the deviation, which can be considered, even if the rotating ends support its precision, but there are also a part of the error elimination between the two bearing seat holes and the coaxial magazines at both ends. Surface measures such as sandblasting, slightly larger diameter than the first row of precision plug holes, surface hardening, is conducive to improving accuracy. Provides a precision for the stable operation of the machinery has a lot of help, can reduce the occurrence rate of the mechanical deep groove ball bearing failure, so we should try to improve the precision when we install the TIMKEN bearing.
In order to ensure higher actual results, the surface roughness of the shaft and the seat and the TIMKEN bearing should be as small as possible, so that these measurements should be assembled on the corresponding surface of the cylindrical bearing hole, shaft and bearing seat holes, and the two sides of the corner are assembled separately, indicating the two marks, so the maximum deviation in the actual assembly is made. To develop, make the maximum deviation of the two sides match the deviation in the same direction, so that after assembling, the two sides can be partially offset.
(1) the sound of the raceway of the bearing and its control method the sound of the raceway is a slippery continuous sound produced by the rolling of the rolling body on the raceway surface. It is the unique basic sound that all the rolling bearings will take place. The general deep groove ball bearing sound is the raceway sound plus other sounds. The raceway noise of ball bearings is irregular, the frequency is above 1000Hz, its main frequency does not change with the speed, but its total sound pressure level increases with the acceleration of speed.
The sound pressure level of the raceway is reduced with the increase of viscosity; while the TIMKEN bearing with a small raceway, the sound pressure level is reduced to an increase when the viscosity increases to more than about 20mm2/s. The greater the rigidity of the bearing block, the lower the total sound pressure level of the raceway. If the radial clearance is too small, the total sound pressure level and main frequency of raceway will increase sharply with the decrease of radial clearance.
The way to control raceway noise is to select a low noise bearing, a deep groove ball bearing with a small waviness, and carefully choose the conditions of use. Raceway noise often affects the noise of the whole machine, reducing the raceway noise can reduce the noise of the whole machine.
(2) the impact sound of the roller and its control method, when the ball bearing or deep groove ball bearing is running at a low speed under the pure radial load, the rolling body in the non load area will impact the cage or the raceway due to the smaller centrifugal force of the roller. But with the increase of speed, the sound will disappear. The control methods of rolling impact sound include: reduce radial clearance properly, use bearings with reasonable structure and material flexibility.
(3) the rolling sound of bearing and its control method are the piercing metal frictional sound that may occur on all occasions, most of which occur in the large type of grease lubricated bearing, but are more likely to occur in the lubricating grease with poor base oil performance and are almost unborn when oil is lubricated.
In addition, it is easier to occur in winter. When the radial load is subjected to a pure radial load, it is easy to occur in the case of large radial clearance and is easy to occur in a specific speed range with the size of the model, which will occur continuously and intermittently. The special processing method for outer ring raceway can prevent the rolling sound from appearing. When necessary, this kind of deep groove ball bearing can be selected, or the radial clearance of TIMKEN bearing can be reduced properly, the lubricating grease with excellent performance is used and the rigidity of the matching machine with the bearing is improved
