A machine bearing information how to do high temperature resistant and smooth

Since the plane to create, the aircraft has become a modern culture is short of transportation. As is known to all, the plane launch machine is one of the most important parts of an aircraft, aircraft launch machine bearing on out after the high temperature gas propulsion turbine, turbine through a shaft drive. In the building of a complex, a machine bearing is the most important thing in this structure, the center structure. Can say so, a machine of the whole structure, is under the drive of bearing stop work; Therefore, bearing resolution is launched a 'brain', the performance of machine on its manufacturing process is also the most exquisite. Of the many properties, heat resistance, is a machine first. If a launch machine bearings can not accept by high speed rotating friction caused by the high temperature, then strong load ability and smoothness, all is lost. In machine, a Russian by Russia's casting type, and the United States USES is welded. Domestic subject to data and the cause of structure mechanics, there is no deal with the issue of resistance to high temperature. First of all, let us understand the aircraft launch machine operating condition: 1, high speed. General aircraft launch machine speed above 18000 r/min, so the request of high speed of data is very high. 2, high temperature. A machine operating temperature is very high, bearing operating temperature may reach 300 ℃, the bearing information demand tolerated high temperature. 3, high solid degrees. Whether civil aircraft or battle machine on the strong request is very high, juggle is proposes. Know the operating condition of the bearing, can choose to follow the working condition of the bearing, because of bearing high operating temperature, outer ring USES the AISI M50 material with good resistance to high temperature and high temperature stability, the data in 300 ℃ C 58 HRC hardness can still be reached. When high-speed operation, due to the bearing inner ring is rotational, centripetal force is very big, bearing inner ring section to accept ring tensile stress, so the inner ring appearance can't have any micro crack, in order to prevent the crack propagation under tensile stress, thus AISI M50NiL data is often used to do the inner ring. Owing to the high speed of 10, in order to reduce the additional load caused by the centrifugal force of steel ball, ordinary adopted quality compare with light, high hardness compare with ceramic material, for example ammoniation silicon ( 文中介绍) Or titanium carbide ( TiC) Such as steel ball, sometimes in order to increase the wear resistance of the bearing inner and outer circle and reduce friction, in - Spraying ceramic outer ring raceway. Launched machine temperature more than 300 ℃ C, up to more than 1500 C, how will the bearing temperature 300 ℃ C, this is smooth the merits of the system, but smooth bearing the function of the system and a main is cooling. Airlines launched main bearing, for example, one of main bearing is the key to the airlines launched machine parts. Under the condition of high speed, high temperature, complex loading operation, main bearing quality and performance directly affect the machine performance, and reliable service life. Airlines launched machine is one of the key indicators of high reliable. To ensure reliable, one of the premise is to ensure that a bearing with short-lived life - in the machine The service life of main bearing, military aviation launch machine request in 3000 hours, commercial airlines launched machine request higher, to reach tens of thousands of hours. And bearing in airlines launched machine work environment to be able to complete with the 'purgatory' to describe, they are not as long as with tens of thousands of RPM speed high speed for a long time, but also accept all kinds of ways of extrusion stress, friction and ultra high temperature. In fact, the high speed turbine in order to reduce the friction with the floating bearing, can only be transmitted torque, friction to a minimum, angular contact bearing is used to accept other axial thrust is mainly composed of torque thrust bearings. A machine blade is mainly composed of composite materials, compressor blade not too big request. Initiated in the crankshaft has smooth and airway. Gas turbine blades and guide blade in the middle of the airway, leaf appearance laser with holes, useful when working in leaf appearance of gas membrane between high temperature gas. In order to increase the machine performance and using life, in the process of high temperature alloy to carry out, the development of the manufacturing process of alloy plays a great boost. Due to the present vacuum smelting technology, harmful impurities and gas removal in alloy, especially the accurate control of alloy composition, improves the performance of the high temperature alloy progress from time to time. Subsequently, the directional solidification and single crystal growth, powder metallurgy, mechanical alloying, ceramic cores, ceramic filter, such as isothermal forging process of new victory, to promote the rapid development of high temperature alloy. The directional solidification technology is the most prominent, the use of directional technology make directional solidification and single crystal alloy, its temperature is close to 90% of initial melting point. Therefore, the current world advanced airlines launched machine blade is directional, single crystal alloy turbine blade. From the point of international scope, constitute the equiaxial crystal nickel-based casting high temperature alloy, directional solidification system column crystal and single crystal alloy. High temperature alloy powder is carried out by the first generation of 650 ℃ to 750 ℃, 850 ℃ powder turbine disc and double performance powder plate, used for advanced high performance by machine. Bearing manufacturing, not only demand information science, mechanics and consumption process. Also needs a lot of objective conditions, for example, must have suitable raw material and excellent metal smelting. Machine not only that, by experimental process is also not far, need spend a lot of money, as well as excellent talents and equipment to stop type experiment, each type that into a lot of discussion about a country, it will form a very heavy responsibility.