Import IKO roller bearing to improve precision of the matters needing attention

The precision of the rolling bearing is not too high, is there any way to improve? The precision of the rolling bearing can be improved, the following is the most commonly used rolling bearing of the four methods for increasing accuracy of bearing. 1) Bearing installation space can accommodate import bearing type in IKO bearing installation space due to the design of shafting pay attention to the rigidity and strength of shaft, so generally, first determine the diameter of axle, bearing inside diameter. But rolling bearing series of a variety of sizes and types, should choose the most suitable type of bearing. 2) The size, direction and nature of load bearing load [ Bearing load capacity with basic rated load, according to the values shown in table bearing size] Bearing load abound change, such as the size of the load, if only the radial load, axial load is a one-way or two-way, the degree of vibration or shock, and so on. After considering these factors, and then to select the most suitable IKO bearing type. In general, the same inner diameter of the bearing radial load capacity increasing in the following order: < < angular contact ball bearing deep groove ball bearing cylindrical roller bearing < < taper roller bearing self-aligning roller bearings (3) Speed can adapt to mechanical bearing type to benchmark the threshold of the imported bearing rotating speed with speed limit, said its value is shown in table bearing size] Bearing limit rotational speed is not only to take on bearing type is limited to the bearing size, cage type, precision grade, load condition and lubrication method, etc. , therefore, when the choice must consider these factors. Most of the following bearings used in high speed rotation: deep groove ball bearings, angular contact ball bearings, cylindrical roller bearing (4) Has the required rotation accuracy of rotary precision bearing type [ The dimensional accuracy and rotation accuracy of bearing is not the GB by bearing type standardization] Machine tool spindle, gas turbine, and control machine, high rotating accuracy, high speed and low friction, at this time should be used more than 5 level precision bearing. Generally use the following bearings: deep groove ball bearings, contact ball bearing, cylindrical roller bearing. 5) Just performance to meet required for mechanical shafting rigid bearing type [ Imported bearing load, the part of the rolling element and raceway contact will produce elastic deformation. 'High rigidity' refers to the deformation of the elastic deformation smaller] Reduction device at the end of the spindle and auto parts, such as to raise the axial rigidity of at the same time, also must improve IKO bearing rigidity. Roller bearing the load deformation than ball bearings. (on bearing preload Negative clearance) Can improve the rigidity. The method is suitable for angular contact ball bearings and tapered roller bearings. One, measuring the size of the shaft and bearing hole, to determine with precision of the bearing, cooperate with requirements as follows: inner ring and shaft adopt interference fit, interference was 0 ~ + 4 microns ( At light load, high precision of 0) ; Outer ring and bearing hole clearance fit, the interval 0 ~ + 6 microns ( But on the free end bearing with angular contact ball bearing, still can increase the clearance) ; Shaft and hole surface roundness error in under 2 microns, bearing the face of baffle used parallelism in under 2 microns, shaft shoulder end foreign face beat in under 2 microns; Axis bearing hole block shoulder to beat under 4 microns; Spindle axis inside the front cover end face beat under 4 microns. Second, the fixed end before the installation of the bearings on the shaft, bearing with clean to clean a thorough cleaning of kerosene, for grease lubrication, to contain 3% ~ 5% of organic solvent injection bearing grease for degreasing, cleaning and quantitative grease oil gun will fill in the bearing inner ( Accounts for 10% ~ 15%) of the bearing space volume ; Heat bearing the heat up 20 ~ 30 ℃, IKO bearing load shaft end with the hydraulic press, Will set casing pressure on the shaft and with appropriate pressure against bearing face makes its axial positioning; The lace will spring balance volume on the bearing outer ring, use the method of measuring start torque check is the preload of the regulation for substantial changes ( Even if the bearing is correct, but due to cooperate or cage, the deformation of the preload is also has the potential to change) 。 Three, the rolling bearing - Shaft assembly into the hole: heating holes make up 20 ~ 30 ℃, with a continuous gentle pressure of IKO bearing - Shaft assembly into a hole; Adjust the front cover, make the front cover of fastening is 0. 02 ~ 0. 5 microns to bearing outer end face as a benchmark, the dial gauge meter resistance on shaft neck surface, will beat measuring the rotation axis, request error under 10 microns; Will be located on the shaft, dial gauge meter resistance in the back seat hole surface, the axis of rotation to measure before and after bearing hole of the alignment. Four, put free end import bearing selectively may offset the position of the deviation, after installed on the bearing support position, offset each other as much as possible of roundness error and axiality deviation.