Selection and use of iron, Ken bearing note some common sense

1. Iron, Ken bearing load size, direction and nature [ 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 appropriate type of bearing. In general, the same inner diameter of the bearing radial load capacity increasing in the following order: deep groove ball bearings (angular contact ball bearings < < < circular cone roller bearings cylindrical roller bearing self-aligning roller bearing 2. Tilted relative analysis of inner ring and outer ring of iron, Ken bearing inner ring and outer ring tilted relative factors ( Such as load caused by the deflection of shaft, shaft, and the precision of the shell bad or installation error) And choose to adapt to the conditions of use of the bearing type. If the inner ring and outer ring is too big, the relative tilt internal load bearing will cause damage. So should choose the types of bearing can withstand the tilt. In general, allowed to tilt Angle ( Or the heart) Increasing in the following order: cylindrical roller bearings, tapered roller bearings, deep groove ball bearings, Angular contact ball bearing) And spherical roller ( The ball) Bearing 3) Just performance to meet required for mechanical shafting rigid bearing type [ Bearing the 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 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. 3. Bearing installation space can accommodate in bearing installation space type bearing 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. Generally use the following bearings: deep groove ball bearings, contact ball bearing, cylindrical roller bearing. 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] 吗? 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. 5. Install and remove the periodic inspection frequency installation and the installation method frequently installation, use of inner ring and outer ring separable cylindrical roller bearings, needle roller bearings and tapered roller bearing is more convenient. 6. Iron, Ken rotational speed can adapt to mechanical of bearing type [ To benchmark the threshold of the bearing rotating speed in limiting speed, 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. Bearing matters should be paid attention to when using 1, selection of shaft and the bearing chamber tolerance and control: after the bearing pressure into the bearing should be flexible rotation without blocking. If there are any obvious rotation is not flexible, indicates the size of the shaft is too big, tolerance to downgrade. Such as bearing pressure into the shaft by hand after the rotation has obvious 'sasha vujacic' feeling, may be the shaft or shaft roundness tolerance is too big. When control the shaft and the bearing chamber tolerance so also want to control the roundness, at present many domestic manufacturers to control the tolerance, not to control the roundness. 2, bearing assembly way: because the bearing is high precision products, such as improper assembly is easy to cause damage to bearing channel, result in bearing damage. When bearing assembly shall have a dedicated mold, not casually, only small circle of stress when pressure into the shaft, pressure can force the circle circle. Require the use of pneumatic or hydraulic assembly, lower die when being connected to outside the level state, if there are any tilt can lead to bearing channel due to mechanical damage, and make the bearing guide ring. 3, the assembly to prevent foreign body: bearing in loaded on the rotor dynamic balance when it is easy to dynamic balance of iron into the bearing inside, so it is best to install bearing before do dynamic balance. There are some manufacturers in order to convenient assembly, assembly in bearing indoor coated with some oil or grease lubrication effect, but usually operators good amount of it is hard to control, if oil or grease in the bearing interior storing up more, the iron, Ken bearing rotates along axis to the bearing inside easily. Bearing chamber it is best not to apply oil or grease, if must apply to control shall not be storing up in bearing interior. 4, paint, rust prevention: paint rust is characterized by multiple in sealing type motor, the motor sound is very good, when it is assembled but put some time in the warehouse, the motor sound is very big, remove the bearing has serious rust phenomenon. Many manufacturers will think is a problem of bearing before, after our propaganda, motor factory now have realized mainly is a question of insulating varnish. Acid varnish comes out of the problem is mainly due to the formation of corrosive substances under certain temperature and humidity, the bearing channel after corrosion result in bearing damage. The problem now is only to choose good insulating paint, after drying and ventilation assembly after a period of time. Iron, Ken bearing life is closely related to manufacturing, assembly, use, and must be made at each link to make the bearing is in optimum operation state, so as to prolong the service life of bearing.