(1) there is a requirement for low noise rolling bearing
Part in the production of standard import bearings, single row short centripetal ball bearings and cylindrical roller bearings are for the use of motor bearing varieties of low noise. The ball bearing from 60 mm diameter from 2.5 mm to have several varieties with Zl, Z2 and Z3 three suffixes, corresponding to three different types of low noise, and roller bearing from N309 type to N322 type, a total of eight models have made according to standard low noise.
These SKF 6203 Bearings http://www.fagbearings-hk.com/newproduct/SKF-6203-bearings-60218.html can apply to other machines with low noise requirements, and the price is cheap, as on the type and size can be request, try to use the two types of low-noise bearings.
(2) the bearing noise is relatively small
When you can't use these two types of low noise bearings, bearing can use noise is relatively small. The comparison of concrete on the basis of the following:
1) the noise of the ball bearing is lower than that of the roller bearing, relatively less sliding bearing (friction) more noise than the relative sliding bearing is low;
2) using entity cage imported bearing noise is relatively lower than using punching cage bearing; Using the plastic cage bearing noise than using the above two cage bearing are low; Count more, outer ring thickness, noise is small;
3) high precision bearing, especially the higher precision of the rolling element bearing, its noise than low precision bearing noise is relatively small;
4) small bearing noise than the big bearing noise is relatively small.
For example, the centripetal ball bearing noise is smaller than short cylindrical roller bearing, short cylindrical roller bearing noise and smaller than the noise of the tapered roller bearing.
Lubricant selection error, lack of lubricant or aging scleroma, can cause a vibration and noise of the imported bearing, and the noise is not necessarily the rules. About this situation, as long as chooses appropriate smooth agent, adjust its smooth dose, extends the using life of smooth agent and reasonable change cycle.
When bearing the workpiece serious overheating coarse grains, but also make 8 existing dimension in steel increases, easy to cause the workpiece hot working performance deterioration.
(1) strictly controlling lcrl8Ni9] ri stainless steel casing, flange forging heating temperature and heating time of heat preservation, prevent work-piece overheating make coarse grains.
(2) in the production of forging workpiece, such as forging ratio is too small, the final forging temperature on the high side, also easy to appear coarse grain structure defects, should make the workpiece forging ratio appropriate, sufficient, finish forging temperature is moderate.
(3) import bearing the workpiece heat treatment solid solution treatment temperature is unfavorable and exorbitant, heat preservation time shoulds not be too long, the heating temperature should be no higher than 1150 "C, the heat preservation time to 1 a l5min/mm calculation is advisable.
(4) to prevent excessive organization bulky artifacts, can be used to forge refine grain method to eliminate defects, to prevent the occurrence of orange peel during cold deformation of workpiece surface defects, improve the surface quality of workpiece.