Short stress 380 hot rolling mill bearing damage cause analysis - bearing knowledge

A hot rolling finishing mill, wire factory 380 short stress using FC4054170 / P64 bearing in some time ago, frequent online bearing burning failure many times, has seriously affected the online production. My company rolling mill bearing technical engineers made a special trip to the factory for technical communication for this matter. The steel mills use FC4054170 / P64 bearing is composed of two supply on them, a roller number is 4 - 34, another number is 4 - 36 grain, both radial clearance delivery products are 0. 25 mm, both inner ring raceway diameter size of supply is 222 (phi 0 - 0. 10) 。 Supply products below; Figure a figure 2 figure it is 36 rolling body, figure 2 is 34 grain of rolling body. Steel technical engineers, 36 grain of rolling element bearing online using wasn't burned, burned every time is 34 grain of rolling element bearings. Or two bearings used interchangeably, all burn 34 grain of rolling element bearing, given the rule, is the cause of steel mills to summarize: 36 grain of rolling element bearing force at work much and would not burn bearing roller, 34 grain of rolling element bearing work stress of roller bearing caused by frequent online less damage. On-site inspection of two production FC4054170 bearings, bearing the quality difference is very big still, wrong bearing do detailed comments here. In view of this situation, only talk about my personal views and Suggestions. FC4054170 bearing roller number 34, 36, 38, when used in hot rolling mill radial clearance control mostly in C4 group. My personal opinion is have no direct relationship with the roller grain number of bearing burning, should search for bearing in the bearing on the processing quality more the cause of the loss. For FC4054170 bearing processing quality are as follows: 1) Control the product bearing outside diameter to 0. 01 mm or less. 2) Products bearing two outer diameter difference must be controlled in 0. Within 005 mm. 3) Products bearing four columns of raceway clearance bad try to control each other at 0. Within 005 mm. 4) Roller momentum to be 0. 10 mm or less. 5) Parallel to the outer raceway penal difference must be controlled in 0. 02 mm or less. 6) Products bearing roller surface must crown superfinishing, meet the requirements of machining accuracy level Ⅲ roller roller.