The precision parts of rolling bearings need to be used with corresponding caution, which not only changes the use of high-performance linear bearings. If they are not used properly, they can not achieve the expected performance test results. Therefore, the following aspects Iko Linear Bearing should be considered when using bearings:
Keep the bearings and their surroundings clean. Iko Linear Bearing Even the invisible dust bearing smile will increase the wear, vibration and noise of Timken bearing.
During use and installation, it is not allowed to use strong punching carefully, Iko Linear Bearing it is not allowed to use hammer bearing, and it is allowed to hit directly through rolling pressure.
Use proper and accurate installation tools and special tools, Iko Linear Bearing and try to avoid the use of fabrics, staple fibers and.
To prevent IKO bearing from corrosion, select the bearing directly by hand, Iko Linear Bearing fully wash the sweat on the hand, and apply high-quality mineral oil before starting. Pay special attention to rust in rainy season and summer.
After the bearing is installed in the main engine, there is a measurement index called circular rotation accuracy. This change approximately repeats, and the required number of Iko Linear Bearing revolutions represents the “quasi period” of cyclic rotation accuracy. The large amplitude of value change in the quasi period is the poor cyclic rotation accuracy.
When the bearing spindle is properly preloaded, this can gradually increase the speed to close to the working speed, so as to Iko Linear Bearing implement the “running in” function of the linear bearing and improve the cyclic rotation accuracy of the spindle.
When the 6202 / P2 type bearing is used for the main shaft, but its accuracy still can not meet the requirements, Iko Linear Bearing the journal is thickened and a raceway is made on it to replace the inner ring, and the steel balls are accurately measured. Each group of steel balls is divided by three particles in size, and each group of steel balls is separated by an interval of nearly 120 °.
Due to the reduction of one heavy machining surface and one heavy fitting surface, Iko Linear Bearing At the same time, the stiffness of the shaft bearing system is improved, and the nearly equidistant distribution of large three particles and small three particles improves the rotation accuracy of the shaft, so it meets the accuracy requirements of the instrument.
The comprehensive verification method of bearing installation accuracy is introduced in detail. First, install the linear bearing into the main shaft of the bearing. The verification of installation accuracy should go through the following four steps:
The first is to measure the size of the shaft and bearing seat hole to determine the matching accuracy of the bearing. The inner ring and the shaft adopt interference fit, and the outer ring and the bearing seat hole adopt clearance fit.
thoroughly clean the bearing with clean cleaning kerosene, and then fill the quantitative grease into the bearing with an oil gun; Heat the bearing to raise the temperature by 20 ~ 30 ℃, and install the IKO bearing into the shaft end with an oil press; Press the set sleeve on the shaft and press the bearing end face with appropriate pressure to make it axially positioned; Roll the belt of the spring scale on the outer ring of the bearing, and check whether the specified preload changes greatly by measuring the starting torque.
Thirdly, install the bearing shaft assembly into the seat hole: heat the seat hole to raise the temperature by 20 ~ 30 ℃, and install the bearing shaft assembly into the seat hole with continuous and gentle pressure;
Adjust the front cover, take the outer end face of the bearing seat as the benchmark, push the dial indicator against the journal surface, rotate the shaft to measure its runout, position the dial indicator on the shaft, push the dial indicator against the inner surface of the rear seat hole, and rotate the shaft to measure the coaxiality of the front and rear seat holes of the bearing seat.
After, the free end bearing is selectively placed at the position where the deviation can be offset, and installed at the rear support position of the bearing seat to offset the roundness deviation and coaxiality deviation as much as possible.
At this time, professional measurement methods and tools must be used to accurately measure the mating surface dimensions of the inner hole and outer circle of the bearing, measure all the measurement items related to the inner diameter and outer diameter, and make a comprehensive analysis of the measured data. Based on this, the dimensions of the bearing installation parts of the shaft and seat hole are precisely matched.
When actually measuring the corresponding size and geometry of the matched shaft and seat hole, it shall be carried out under the same temperature conditions as when measuring the bearing. In order to ensure a high actual matching effect, the roughness of the matching surface between the shaft and seat hole and the bearing shall be as small as possible.
During measurement, two groups of marks indicating the direction of large deviation shall be made on the outer circle and inner hole of the bearing and the corresponding surface of the shaft and seat hole on both sides close to the assembly chamfer,
so that the large deviation of the matching two sides can be aligned in the same direction during actual assembly, so that the deviation of both sides can be partially offset after assembly. When the deviation compensation is comprehensively considered, the rotation accuracy of the supports at both ends is improved, and the coaxiality error of the seat hole between the two supports and the journal at both ends is partially eliminated.
The size and diameter of rolling bearing hole are based on the standard tolerance. The bearing inner ring and shaft, outer ring and housing and the sealing hole of the magazine can only be realized by controlling the seat hole tolerance and tolerance. Linear bearing inner ring and shaft hole system, using the base, bearing outer ring and housing hole and machine tool shaft system.
With the right choice, we must know the actual load conditions, temperature and other requirements of IKO bearing, but in fact it is very difficult. Therefore, in most cases, it is based on refining using this selection.