Foreign bearing information

Source: China Bearing Network Time: 2013-11-18

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Abroad bearing data summary: rolling bearing parts point touch touch method touch stress long-term operation work site in the host heart joints key host accuracy life reliability largely determined bearing various mechanical motion support bearing operating environment can be ultra-high temperature ultra-low temperature corrosion Wang Shui High temperature caustic nano ultra-high vacuum 1.33Pa can impact abrasive wear ultra-high speed dmn value up to 2. 2 harsh environmental demand can thk SBN 5012-5 lead Screw 2002: machine tool, accession to the world is a warfare professor pointed out to increase China's CNC The development of machine tools accelerates the development of popular CNC machine tools. The service competition of China's machine tool manufacturing industry. The current situation and prospects of China's milling machines and processing intermediate shopping malls. The skill level and development direction of domestic and international lathes. The production, demand and development intentions of domestic and international machine tools. Carry out the trend of trending international CNC system development.
Rolling bearing parts are operated by touch or line touch for a long time under high contact stress. The working parts are mostly in the heart or joint of the main machine. The accuracy, life and reliability of the main machine are largely The resolution is in the bearing. As a support for various mechanical movements, the working environment of the bearing can be ultra high temperature (>1000 Â°C), ultra low temperature (-253 Â°C), strong corrosion (acid, alkali, aqua regia and high temperature caustic soda) and super High vacuum (1.33Ã—10-9Pa) can also be strong impact, strong abrasive wear, non-magnetic and ultra-high speed (dmn value is more than 2. 2Ã—106), etc. The demanding environment can be single item, also Can be a combination of a variety of complex harsh conditions, whether the bearings are still special bearings, the host has a high demand for its life, function and reliability. There are many factors affecting the bearing life, the data and heat treatment The share is large.
Bearing layout characteristics and operating conditions require bearing data with high hardness, high wear resistance, high touch fatigue strength, high elastic limit, outstanding impact toughness, outstanding crack toughness, outstanding dimensional stability Sex, outstanding rust prevention and outstanding hot and cold processing functions. To ensure these functional requirements, the metallurgical quality of bearing steels is necessary to ensure strict chemical composition, especially high purity (primary additional non-metallic inclusions), Very low oxygen content and residual element content, severe low magnification and high magnification (micro) arrangement, severe carbide inhomogeneity, severe appearance decarburization layer and internal looseness, segregation, microporosity, etc.; Allows for external appearance and internal defects such as cracks, slag inclusions, burrs, folding, crusting, scale, shrinkage, air bubbles, self-pointing and over-burning. To ensure the processing function, there is also a severe demand for the dimensional accuracy of steel. The quality of steel is the most demanding and most inspectable steel in all alloy steels. Internationally recognized, the level of bearing steel is a mark of the country's metallurgical level. The latest metallurgical skills are usually first The use of bearing steel development and production.
In recent decades, industrial developed countries can be roughly divided into two aspects in the development and production of bearing steel: on the one hand; using new exercise skills and equipment; or improving the traditional exercise techniques and equipment; Medium oxygen content and the amount of inclusions; improve the dispersion, scale and shape of inclusions; improve the crystallization status; to improve the metallurgical quality of the original steel; produce longevity, pure or ultra-high clean steel, on the other hand; The chemical composition of the original steel grade is improved or the new bearing steel is developed; the functional requirements of the bearing are higher and higher with satisfactory use; or the cost of the whole bearing is reduced under the premise of having the same function. .

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