Countermeasures for iron ore crusher fatigue and wear

The process of iron ore crusher fatigue and wear refers to the cracks expansion and destruction process. According to the location of the cracks, fatigue wears mechanism has the following two situations:
1. Rolling contact fatigue wears. Rolling bearings and transmission gear and the one that has the relative rolling friction surface pitting and off phenomenon is caused by rolling contact fatigue wear. It is characterized that after a certain number of cycles of contact stress, pitting or peeling appears and leave the pox porphyraceous pit on the friction surface, the depth is of 0.1-0.2mm or less.
2. Sliding contact fatigue wears. Two rolling contacted object at a distance under the surface 0.786b (b is the half width of the planar contact area) get the largest shear stress and the plastic deformation is most severe here; repeated deformation under cyclic loads can cause the material local weakening, and first cracks in the area.
Countermeasures to reduce or eliminate iron ore impact crusher fatigue wear is to control the factors affecting the generation and propagation of cracks, the followings are countermeasures:
1. Material. The inclusions easily cause the stress concentration, the edges of these inclusions is most likely to form cracks, thereby reducing the contact fatigue life of the material. The organization of the state of the material, internal defects also have an important impact on the wear.
Typically, fine grain, uniform, carbide into a ball and even distribution are conducive to improve rolling contact fatigue life. Bearing steel after treatment, if there are more residual austenite, and the surface useful strength of the residual compressive stress and the carburized layer will be lower. In the same conditions of the undissolved carbide state, the mass fraction of carbon in the martensite is about 0.4% and a 0.5%, the strength and toughness of the material is better.
2, the lining surface roughness. Appropriately reduce the lining surface roughness is an effective way to improve the resistance to fatigue and wear ability; the lining surface roughness is related to the contact stress of the liner surface to withstand. In addition, the liner surface stress state, the level of accuracy, the nature of the lubricants has impact on fatigue wear rate.
 

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