NSK bearings to choose and apply the attention to matters

NSK bearings in the machinery is mainly ACTS as the role of support and reduce friction, so the accuracy of NSK bearings, noise is directly related to the use of machinery and the life. NSK bearings so we in the purchase and use of NSK bearings needs pay attention to some things, the bearing network as bearing industry one-stop service web site, to share the relevant knowledge. The type of NSK bearings use is widespread, let's take NSK deep groove ball bearings of the stop. NSK bearing NSK bearings of choose and buy items: 1, the types of options: NSK bearing is common, that is by the user's technical personnel according to the using conditions supporting products and accept load NSK bearings to stop selection. Business people can understand the practice of the user load and NSK bearing corresponds to the selected, NSK bearings if not use request, should be initiative restructuring model as soon as possible, but unless special product general won't have any problems in selecting type. 2, NSK bearing clearance choice: when users purchase NSK bearings, businesses will only ordinary told in what type, grade, rarely, at the request of the clearance of NSK bearings NSK bearings business people must ask the use conditions of NSK bearings, including speed, temperature, NSK bearing clearance fit tolerance are directly related to the choice. Ordinary under 3500 RPM speed motor USES mostly CM clearance such as high temperature and high speed request adopt relatively large clearance. NSK bearings clearance after assembly will rise as a result of the inner hole and the decrease of cylindrical and incur reduced, the reduction of clearance = interference quantity x60 % ( Except the NSK bearing chamber is aluminum) 。 NSK bearings for clearance is zero before assembly. 01 mm, interference when assembling the quantity to zero. 01 mm, NSK bearing assembly after the clearance of 0. 004mm。 NSK bearings in theory when zero clearance noise and life are to reach the best state, but in the practical operation thinking to problems such as temperature, NSK bearing clearance to 0 after assembly. 002mm- 0. 004 mm is better. 3, the choice of grease: the choice of grease is ordinary NSK bearings based on the speed, the condition of heat resistance and noise request and aerodynamic moment stop choosing, request us to grease the west can understand. 4, the choice of the ways of NSK bearing seal: smooth of NSK bearings can be divided into smooth smooth oil and fat. Oil smooth NSK bearing NSK bearings ordinary is to choose way, NSK bearing ordinary fat smooth choose dust cover or rubber seal seal. Dust cover suitable for high temperature or using good parts, seal two points contact seal and non-contact seal, contact seal dustproof performance is good but the aerodynamic torque is bigger, non-contact seal pneumatic torque is small, but there is no contact sealing performance is good. NSK bearings needs pay attention to in the use of the contents: 1 NSK bearings, shaft and chamber of tolerance of choice and control: after the NSK bearings NSK bearing pressure should be sensitive rotation without block. If there are any apparent rotation not sensitive, indicates the size of the shaft is too big, tolerance to downgrade. NSK bearings, such as 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. So in good control of NSK bearing chamber axis and tolerance to the control good roundness, at present many domestic manufacturers to control the tolerance to stop, only without the roundness stop control. 2, NSK bearing assembly way: because NSK bearings are high precision products, such as improper assembly is easy to NSK bearings for the channel formation damage, cause damage of NSK bearings. NSK bearings in the assembly shall have a dedicated mold, not casually, only when pressure into the shaft, can the small circle stress, pressure can force the circle circle. Assembly request when using pneumatic or hydraulic, lower die when being connected to outside the state, if have tilted NSK bearings will incur channel due to mechanical damage, and make the NSK bearings produce guide ring. 3, the assembly to avoid foreign bodies: NSK bearings in loaded on the rotor dynamic balance when it is easy to dynamic equilibrium when the NSK bearing internal iron into, so it is best to do dynamic balance the NSK bearings before. Some manufacturers in order to assemble bento, NSK bearing assembly in indoor apply some oil or grease on smooth effect, but often operators good amount of it is hard to control, if oil or grease NSK bearings in indoor storing up more, NSK bearings in turns easily NSK bearings along the shaft into the interior. NSK bearings room had better be not to apply oil or grease, if must apply to control, NSK bearings shall not be in indoor have left. 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 NSK bearings have serious rust phenomenon. Before many manufacturer would think that is a question of NSK bearings, after our propaganda from time to time, motor factory now has realized mainly is a question of insulating varnish. The problem is mainly due to the insulating paint volatilizes the acid under certain temperature and humidity of corrosive substances, NSK bearing NSK bearings to channel after the corrosion cause damage. Asked the title can be to choose good insulating paint, before and after drying ventilation assembly after a period of time.