2013年11月17日星期日

you should note the following 1 bearing installation should be clean

High-speed precision angular roller bearing manufacturer contact ball bearings , mainly used for high-speed rotating occasions lighter loads , requiring high precision bearings , high speed, low vibration and low temperature rise a certain life . Often high-speed spindle support member installed in pairs , is the inner surface grinding spindle speed key component parts .
The main technical indicators:
1 bearing precision index : Over GB/307.1-94 P4 class precision
2 high-speed performance: dmN value 1.3 ~ 1.8x 106 / min
3 life ( average ):> 1500 h
High-speed precision angular contact ball bearing service life of a great relationship with the installation , you should note the following
1 bearing installation should be clean , clean room for the bearing to be carefully matching, bearing Angular contact ball bearing spacers to go through the grind of maintaining high inner and outer ring spacers under the premise of the spacer should be controlled in parallel 1um the following ;
(2) Before installing the bearings should be cleaned , cleaning the inner slope upward , feel should be flexible , no sense of stagnation , dried , placed in a predetermined amount grease, oil mist lubrication should be placed in the case of a small amount of oil mist ;
3 bearing installation tool should be used exclusively , even by force , is strictly prohibited beat ;
4 bearing deposit should be clean and ventilated , non-corrosive gases, relative humidity less than 65% , long-term storage should be periodically rust.

acting on the radial and axial certain minimum load

In order to ensure satisfactory performance , needle roller / angular contact ball bearings like all ball bearings and roller bearings , must always bear acting on the radial and  Angular contact ball bearing axial certain minimum load , especially if they want to run at high speed or subjected to high accelerations or rapid changes in the load direction . Under these conditions , the rolling element and the inertia force of the retainer and lubricants friction bearing arrangement may play a deleterious effect on the rolling conditions , and may cause the rolling element and the raceway between the sliding destructive .
Increase in radial needle bearing on the necessary minimum radial load can be estimated using the following formula :
Frm = 0.02 C
Angular contact ball bearings necessary Deep groove ball bearing minimum axial load can be calculated using the following formula :
Where
Frm = minimum radial load, kN
Fam = minimum axial load, kN
C = basic dynamic load rating ( see product table ) , kN
C0 = basic static load rating ( see product table ) , kN
dm = bearing mean diameter
= 0,5 (d + D), mm
n = rotational speed, r / min
Cold start or lubricant viscosity is very high, even demanding loads. Bearing weight of the components together with external forces generally exceed the minimum necessary load. If this is not the case, you must give Needle roller / angular contact ball bearings impose additional radial and / or axial loads.

2013年11月4日星期一

Eventually, they optimize the accuracy, reliability

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