Shaped surface of rail grinding

Railway wheel-rail contact system is based transport system, in which rail plays an important role. Because of its large, we should support the weight, inevitably there will be a variety of loss and damage. The rail grinding is a kind of an important means of rail maintenance. Carried by rail grinding, not only to restore the rail section shape, but also a purpose to change its shape, to prevent the occurrence and development of rail failure to improve the performance of wheel-rail contact purposes. Therefore, the study of rail grinding wheel surface have a strong practical value. In this paper, the following aspects of the rail grinding wheel surface were studied: 1. To the vehicle - track coupling dynamics theory, the use of rail-shaped surface field measurement data, analysis of the curve of the outer rail wear on the vehicle through the curve after kinetic behavior.Analysis showed that after the rail wear and wheel-shaped surface can not be good form with the surface will affect the vehicle curving performance, and may even lead to accidents. 2. To reduce the wheel-rail contact interface method to the gap as the goal, look for the wheel-rail contact stress level of the smaller target-shaped side rail grinding, rail grinding program designed to provide a theoretical basis. According to Hertz rolling contact theory of three-dimensional non-rail head to find the optimal range, in this context to ensure the wheel of the dynamic sliding process, the wheel-rail contact point near the minimization of rail head to rail clearance form. Contact stress for the current major railway lines, wear a serious problem, using the current methods of existing 60 kg / m rail is optimized. Use of vehicle - track coupling dynamics and three-dimensional elastic rolling contact theory of non-Hz before and after optimization of rail wheel tread contact with the original static contact performance and dynamic contact performance is analyzed. The results show that the optimization between the wheel-rail interface has a good "conformal" contact characteristics, without reducing the dynamic performance of the wheel the other case, the rail-shaped surface of the optimized wheel-rail contact stress was significantly reduced, can reduce wheel and rail wear. 3. On the type of defects in high-speed rail lines were introduced and analyzed, that the rail defect formation in the initial stage of preventive rail grinding can effectively prevent the development of defects, extend rail life. Then, according to the location of defect formation, size and other characteristics, the empirical design method to design a preventive for high-speed railway rail-shaped polished surface, and described its construction process. Then SIMPACK software and three-dimensional rolling contact theory of Hertz non-kinetic properties and its Performance Analysis of contact mechanics. The results show that the design of the rail preventive rail grinding wheel surface and the surface properties of the original shape are similar, in line with expectations. 

Keywords: rail grinding; minimization to the gap; experience in design; heavy rail; high-speed railway