China's railway freight car rolling bearing research of engineering plastic cage

China's railway freight car rolling bearings 2018 - engineering plastic cage research 10 - 04 a, rolling bearing cage overview of rolling bearing in the set with a number of roles, fixed roller and keep an appropriate distance between each other can make the correct rotation, guide roller from load area into the load area and the attenuation of vibration, which requires the cage has enough strength, toughness, wear resistance, corrosion resistance and application of reliability. China's early railway wagon loaded with rolling bearing cage, is take the cold stamping process of the steel cage, in practice, the breakage of the bearing cage problem is particularly prominent. Most of the fracture position in a big guard from window beam junction, bearing cage once broken, will seriously affect the normal rotation of rolling bearing, and trigger a 'hot' and 'eager' malignant traffic accidents. And abroad, the application of the engineering plastic cage in 1977, the German railway has already begun on the tapered roller bearing test engineering plastic cage, in the 80 s, many European countries are conducted in the laboratory trucks rolling bearing engineering plastic cage of research work, to the end of last century in 80, with engineering plastic cage trucks rolling bearing has been conducted on the European railway operation test. Foreign truck for rolling bearing was developed engineering plastic cage, engineering plastic cage quality steel cage has good wear resistance, corrosion resistance, self-lubrication, impact resistance, low quality, low cost, quality, even in the oil free state, the characteristics of engineering plastic cage self-lubrication, able to maintain the normal operation of rolling bearing for a period of time, improve the safety of railway freight car rolling bearings running, so foreign freight car rolling bearings with engineering plastic cage, slash 'hot' accident, has been successfully used. Three, the research progress of domestic engineering plastic cage cage of engineering plastics application has become the development trend of railway bearing, both at home and abroad to develop railway freight car rolling bearings engineering plastic cage development work extremely urgency and reality. Aiming at domestic railway freight car rolling bearings are used in the original metal cage in fracture failure occurred in the operation of the beam, railway science research institute metal and chemical research institute, the quartet vehicle research institute, erqi long long tai construction machinery co. , LTD. Jointly, in engineering plastic cage has carried on the research work, the quartet institute of vehicles for passenger car short cylindrical roller bearing with engineering plastic cage has carried out research work, the material, product design, mold, process and physical and chemical, and mechanical properties of the samples were studied, the design of our country railway freight car rolling bearings with engineering plastic cage, at present, China's railway truck equipped with rolling bearings had been using the engineering plastic cage. Four, the mechanism of engineering plastic cage engineering plastics alloy is to point to by two and two or more complex system composed of high polymer materials, to realize the combination of different polymer materials favorable performance, and to derive new and useful performance, to meet the actual needs of material; Engineering plastics alloy preparation technology according to the formation of the alloy in different polymer chain between chemical health can be divided into two categories, namely, chemical method and physical method. Usually the former mainly refers to the block copolymerization and copolymerization, the latter mainly refers to the mechanical blending; With the development of polymer alloy, its preparation method is hard to use pure chemical method or physical method to describe, alloy preparation process is often associated with chemical reaction and physical change at the same time, such as the interpenetrating network ( IPN） Technology, reactive compatibilizing technology, etc. , even in the most simple mechanical blending is also graft copolymerization and block copolymerization of chemical reaction. Gao Qiangzeng toughening composites is based on the engineering plastics alloy can obtain good performance combined with the principle, in view of the special railway wagon rolling bearing cage actual performance requirements and design. Toughening nylon reflect good at the scene reflected in elastomer toughening mechanism of plastic, rubber toughening plastics, the main foreign impact energy dissipation in the formation of silver lines, a certain toughness matrix ( Such as PC, PA) Could have high crack caused and low crack growth can, so it is of high and low notched impact strength of the notched impact strength, this kind of polymer after rubber toughening, on the external impact energy dissipation is mainly depends on the shear yield. Visible, of thermoplastic polymer toughening, essentially is that crack growth can be increased. For rubber toughening system of PA66, impact energy consumption mainly in the surface of the fracture, silver grain surface energy and surface energy of the yield deformation energy, and can yield deformation matrix, when the rubber toughening PA66 notched impact, the impact of consumption on crazing can account for about 25% of the total impact energy and impact energy consumption in the matrix yield (75%). In itself has a certain toughness and rubber toughening of the substrate, the absorption of impact energy mainly on cause shear yield deformation. The application characteristics of cage give attaches great importance to the requirements on the material impact resistant properties, so the material must have a high impact strength. （ Source: the resources of railway vehicle platform)