The requirements of the bearing annealing after forging

Bearing annealing after forging, annealing of the technical requirements of bearing, is heated to a certain temperature of bearing forging, after keeping time slowly cooling, allowing it to get close to the equilibrium state of the organization structure and performance characteristics of machining process. Annealing mainly includes the spheroidizing annealing of bearing forging and stress relieving the two aspects of content, in order to ensure the quality of the bearing of the annealing requires strict checks on its technical requirements. The general annealing technology has the following several requirements: 1, the carbide network annealing process of carbide network may not be as the main reason is that the temperature control, one is the point at which the bearing forgings anneal temperature exceeding the standards requirements, the second is bearing forging run during annealing temperature. Is at the same time, the size of the carbide network distribution area and after forging heating temperature and cold forging is related to speed, when the cooling rate is greater than the forging temperature, its distribution area is very small, on the other hand is very big. 2, the hardness of annealing an important purpose is to reduce the hardness of bearing. So, the factors on the bearing hardness greatly influenced by the quality of forgings. In order to prevent bearing hardness reduced in the process of annealing must be in the process of annealing to control the influence factors of hardness, so as to avoid the occurrence of deformation of bearing, and so on and so forth. 3, the depth of decarburization layer of the so-called bearing decarburization, refers to the bearing when heated, decarburization residue phenomenon in the steel, and the depth of the decarburization layer of the bearing is refers to the thickness of the decarburization in the steel. On the depth of the decarburization layer of the strict rules, once bearing forging surface decarburization layer thickness, in bearing heat treatment at the same time also does not have to eradicate it. So, when annealing of bearing forging, is easy to cause bearing cracks, in serious cases may even cause the failure of bearing, scrap directly. Recommended reading: analysis what is the Nmb bearing and quality whether ok or not