Roller surface contact stress at work is very big,so the quality of the roller and the bearing's life and the use of performance has an important influence.Practical application shows that the weakest parts in roller bearing is.

According to the different shapes can be divided into drum roller,roller taper roller,spherical roller and needle.

Although the shape of the roller is varied,but the same in the machining process,the general process for:metal pipe forming (cold heading,turning,forging)-or face soft grinding diameter-heat treatment quenching and tempering-end-grinding ball base (products when required)-coarse grinding diameter-fine grinding diameter-end mill diameter-grinding crown(products when required)-superfinishing diameter(Ⅱ magnitude precision roller).
Roller commonly used mechanical processing equipment are:the material transformation equipment,molding equipment,end face grinding equipment,grinding equipment,diameter of material transformation equipment is the auxiliary production equipment.

With the development of the theory of rolling bearing design,the structure of the roller also have new design,such as roller,roller with crown bus for logarithmic curve on the surface of the end face to the ball for cylindrical roller.The new design can improve the stress of roller,improve the service life of the bearing.At present,in view of the above design of roller processing and new technologies are:

Lean superfinishing method:it is developed on the basis of the ultra precision rectilinear,in changing the inclination of the ultra precision roller superfinishing,conscious of more than the two end of roller,forming outside diameter crown or logarithmic curve. 

Cylindrical roller base ball grinding method of selecting such assignment:it was borrowed from the processing principle of grinding spherical roller bearing outer ring of selecting such assignment.