Because of various complex reasons, such as unreasonable structure, material quality is poor, poor performance, work on the surface of the defect, impact, vibration, improper installation and bad lubrication etc, all can cause bearing early failure. However, in some cases, some bearing did not put into use (run), just users in the process of being original complete face that is broken by, lost use sex, causing premature failure of the bearing.

1. The macroscopic observation

After careful observation physical know:

(1 inner circle is started in groove on one side of the center, accounts for about half of the end diameter or a quarter.

2 in all the damage (not seen for the bearing installed and the trace left wounded by knock, steel ball, maintains a spare parts such as intact.

The appearance of the whole (3 is rugged, but fracture table. No plastic deformation smooth level off, only a very small tear signs haircuts.

(4 fracture with grey fine grain porcelain brittle fracture of.

(5 fracture existence stretch into the inner diameter in second longitudinal straight crack, crack is similar to knife cut, through wall.

2. Test

The inner circle respectively is complete inner circle of hydrochloric acid solution with 1:1 thermal pickling, temperature of 60 ~ 70 ℃, time 10 min

(1 second longitudinal straight cracks and split the fracture cracks and grinding roughly in a "T" type vertical.

In the nearby (2 split rolling word article existing within the grinding burns and grinding strip crack.

3 the entire surface of the rings (distributed the loose shape black the dark spots and pore, its appearance is a round or oval. Magnified 40 times stered microscope and observed under its appearance is irregular hole or circular pinhole, they can be connected into each other like grain boundary shape, but the complete rings surface are rather and bright and clean, can't see the above defects.



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