Foreign bearing materials Abstract: contact stress long-term work sites in host heart joint precision reliability life key host largely determine the bearings of various mechanical movement bearing working environment may ultra high temperature super low temperature corrosion in high temperature caustic soda aqua regia in ultra high vacuum 1.33Pa may impact abrasive wear of ultra high speed DMN value reaches 2.2 harsh environmental requirements may be THK SBN 5012-5 screw 2002: machine tool parts of rolling bearing contact form, accession to the WTO is a challenge but also opportunities experts pointed out that the current situation and Prospect of domestic and international lathe to increase our NC machine tool research and development efforts to accelerate the development of the NC machine tool Chinese machine tool manufacturing industry service competition Chinese milling machine and machining center market technical level and the development direction of the world machining center production, demand and development trend of the world development trend of domestic and international machine tool CNC system trend.
Rolling bearing components to the point of contact or line contact form, in the high pay should contact under the long-term work stress. The site is host to the harmful effects of heart or joint etc.. The accuracy, life and reliability of the host is determined largely by bearing. As the support of all kinds of mechanical movement, the working environment of the bearing may be ultra high temperature (>1000 ℃), the ultra low temperature (-253 ℃), strong corrosion (acid, alkali, aqua regia and high temperature caustic soda etc.) and ultra high vacuum (1.33 × l0-9Pa), may also be a strong shock, strong abrasive wear, no magnetic and ultra high speed (DMN value of 2.2 × 106) etc.. Harsh environmental requirements may be single, may also be integrated a variety of complex conditions, whether ordinary bearings or special bearing, hosts are put forward very high requirements on its service life, performance and reliability. Many factors affect the service life of the bearing, the materials and heat treatment, the proportion of large. The bearing characteristics of the structure and the working condition requirements of bearing materials must have high hardness, high wear resistance, high contact fatigue strength, high elastic limit, good impact toughness, good fracture toughness, good dimensional stability, good anti rust property and good machinability. In order to ensure the performance requirements, the metallurgical quality of bearing steel must ensure that the chemical composition of strict, especially high purity (non metallic inclusions in low level), oxygen content and residual element content is extremely low, low times microstructure strict and high times (Xian Wei) organization, strict inhomogeneity of carbides, surface decarburized layer and internal porosity, segregation, Xian Wei pore stringent requirements; does not allow the existence of cracks, slag, burrs, folding, scarring, oxide skin, shrinkage, bubbles, since the point and the burning surface and internal defects. To ensure the machining performance, dimension precision of steel also has strict requirements. Bearing steel quality is the most stringent inspection items, most steel requirements all in alloy steel. World, bearing steel level is a sign of national metallurgical level. Metallurgical technology the new general first in bearing steel development and production application. In recent years, industrial developed countries for the development and production of steel in the bearing can be roughly divided into two aspects: on the one hand, the new smelting technology and equipment, or to the traditional smelting process and equipment improvements, reduce the amount of oxygen content and inclusions in the steel, distribution, size and morphology improvement of inclusions, improve the crystalline state, in order to improve the quality of original steel metallurgy, production of long-life, pure or super Gao Jie clean steel; on the other hand, the improvement and development of the new bearing steel chemical composition of the steel, the performance requirements to meet different occasions for bearing more and more high, reduce the cost of materials with the same premise or in the performance of the bearing and the cost of production.
SKF BEARING TIMMKEN BEARING NSK BEARING FAG BEARING INA BEARING NTN BEARING KOYO BEARING IKO BEARING NACHI BEARING