Jiaxing bearing | bearing outer ring cross section of the defective magnetic common factors

There is rotational, have HRB bearing ( ) Jiaxing bearing group sales co. , LTD. ( The company) Is bearing group co. , LTD. Established in jiaxing spot sales window, specializing in HRB brand bearings, facing the whole country, the existing stock 50 million yuan, covers the whole bearing, have very strong spot supply, is the group's retail sales center. Metal hot working process is relatively easy to defects, such as forging processing, forging overheating of empty, micro cracks are likely to be bearing fatigue source of contact fatigue failure. China bearing network (for short China axis network) For a railway under a certain bearing outer ring cross section of the magnetic mark example, hope everyone drops of bearing forging processing common problems will understand it. 1, the bearing surface of some common defects in the process of bearing production, similar pit type bearing surface defects, there are several possible: mechanical injury, corrosion pit, forging burnt hole outcrop and raw material defects, etc. Among them, mechanical injury is due to hit or knock against the surface of the parts, corrosion pit is caused by the surface in contact with the corrosive medium surface pit corrosion marks, these two kinds of defects from mechanism determines its internal will not appear in parts. Defects and raw materials for the metallurgy defects, the distribution of the final part is irregular; Forging burnt holes for hot working defects, and its distribution in segregation serious position within the organization. These two kinds of defects not only distributed in the surface of parts. 2, bearing processing is well known, in the manufacturing process of bearing, bearing steel only experienced three high temperature ( More than 800 ℃) Process: hot rolling forming, forging and heat treatment were bainite hardening process. In general, in three heating process, the heat treatment quenching heating temperature is lower than forging and rolling forming temperature. And organizes the rating qualified magnetic marks of bearing ring, prove that there is no overheating in the process of heat treatment conditions, so the production of bearing ring inside the hole should be not produced in the process of heat treatment. 3, the causes of the bearing outer ring section of the magnetic mark after analysis, that the bearing ring holes has been in the bar, the steel supply factory analysis, rolling temperatures cause steel ingot sufficiently low melting point material segregation places to melt, producing local burn, is a fundamental cause of the microscopic pore. Due to the tiny holes in carbide gather location, carbide with low melting point material first melt and gaps, holes. Based on the analysis of above, the ring width of magnetic marks related to raw material microscopic pore. 4, the bearing outer ring section of the defective magnetic common factor 1) Bearing outer ring end face magnetic marks one of the common factor is due to raw material microscopic pore and carbide distribution is banded together. 2) Bearing outer ring end face magnetic marks the second common factor cause of microscopic holes and bearing steel rolling process. If you are looking for the above jiaxing bearing group co. , LTD. The author introduces the bearing inspection and replacement of interest or have any questions, please click on the website on the right side of the online customer service or call:, you close the way of jiaxing bearing purchasing advisors. - - - - - - Editor: jiaxing bearing sourcing consultant LTD. All rights reserved, The company) Reprint please indicate the source