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Interpretation of the basic machine accessories bearing

by:Waxing     2020-11-20
Machine tool bearings bearing is the ball bearing used in industrial machinery, machine tool relative to the small ball bearings, ball bearings and the material is different, the number of the structure are paid more attention to the durability. Bearing bushing and bearing bushing movable part of a large number of applied to aircraft, also often used in helicopter rotor shaft and the aircraft landing gear, etc. Beauty bud is the group in its circle and flange surface USES the independent research and development of teflon material, thus achieved without the use of traditional lubrication conditions. Large and medium-sized ball bearing ( The plane related parts) Applied in aviation supplies of ball bearing, relative to the average small ball bearings, ball bearings and the material is different, the number of pay more attention to the durability on the structure. Roller bearing ( The aircraft's flight control section) Roller bearing is a bearing inner race and the external cage between seat will roller is fixed, can automatically self-aligning bearing. Divided into single row roller bearing self-aligning roller bearing and double LieDiao heart. Compared with the ordinary spherical bearings, rod end bearing, its characteristic is that the starting torque is low. Roller bearing is one of the important parts for aircraft flight control system. Roller bearing ( The plane's engine parts) This kind of roller bearing is mainly used for aircraft engine parts, its characteristic is contact part of the bearing outer ring and inner ring assembly has a cylindrical roller. Micro and small ball bearing tiny ball bearing is composed of outer ring, inner ring, rolling, rolling retainer, seal ( Dust cover) And spring coil of machining parts. Less than 30 mm outside diameter is called the micro and small ball bearing, is to ensure that the shaft of the rotating equipment with high precision requirements stable operation of the bearing parts and assembly in precision parts. Rod end bearing and spherical bearing rod end bearing and the working principle of spherical bearing as the human body joint, is widely used in the moving parts of the airplane wings, the airplane engine connected to the wing sections, aircraft, all kinds of door switch, and a helicopter, trains, motor vehicles, power plants, construction machinery, ships, play equipment, aerospace, and many other fields. Bearing materials and performance one, bearing material 1) Ring, rolling body materials required by the performance: rolling fatigue strength, high hardness, high wear resistance, 2) Cage materials required by the performance: good dimensional stability, mechanical strength and good workability. According to different purposes and demands of its, impact resistance, heat resistance, good corrosion resistance. 3) Ring and rolling body material: ring and rolling body usually use high carbon chromium bearing steel. Most of the bearing, using JIS SUJ2 steel grade. The chemical composition of SUJ2, around the world, as a bearing material has been normalized. For example: with AISL52100 ( The United States) DIN100Cr6 ( West Germany) BS535A99 ( The UK) All belong to the same steel. The steel grade, according to the special purpose, also use the excellent heat resistance of high speed steel, good corrosion resistance of stainless steel. 4) Cage materials: stamping materials, use of low carbon steel. According to different purposes, also used brass, stainless steel plate. Cutting system maintains a material, the use of high-intensity brass, carbon steel, and also the use of synthetic resin. From the perspective of the objective requirements of the machine tool industry, bearing motorized spindle, liquid static pressure bearing motorized spindle and gas bearing motorized spindle is the focus of the market development, is also the academic research hot spot. Angular contact ball bearing is the most suitable for high speed rolling bearing, small friction resistance, low consumption, low cost, easy to serialization and standardization, its limit rotational speed, high precision, high rigidity, high in processing center, CNC milling machine, lathe, grinder and won a wide application in high speed engraving and milling machine, the main technical difficulties to improve the accuracy and reliability. Angular contact ball bearing is the most suitable for high speed rolling bearing, small friction resistance, low consumption, low cost, easy to serialization and standardization, its limit rotational speed, high precision, high rigidity, high in processing center, CNC milling machine, lathe, grinder and won a wide application in high speed engraving and milling machine, the main technical difficulties to improve the accuracy and reliability. Liquid static pressure spindle with liquid oil film as a support, a significant 'error homogenization effect' and damping vibration, the spindle rotation accuracy is much higher than rolling bearing type, its high rigidity, wear small, long life, won the widely used in precision ultra-precision machine tools, the main technical difficulties is to control the temperature rise and thermal deformation of the spindle. Gas bearing motorized spindle with 'film' as a support, piezoelectric spindle rotation accuracy and limit rotational speed is higher than liquid movement and motorized spindle rolling bearing type, its thermal stability is good, is indispensable to ultra precision machine tools and the PCB PCD drill core components, its shortcoming in the low bearing capacity, high technical requirements.
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