During the process of rail grinding,the local high temperature generated in the grinding contact area can affect the physical properties of the rail,thereby affecting its service performance.Therefore,studying the tem...During the process of rail grinding,the local high temperature generated in the grinding contact area can affect the physical properties of the rail,thereby affecting its service performance.Therefore,studying the temperature field of rail grinding is of great significance for improving the quality of rail grinding.In this paper,a calculation model for the grinding depth and contour of the semi elliptical contact area was established based on the contact geometry relationship between the steel rail and the abrasive belt for the first time,and the influence of grinding process parameters on the parameters of the contact area was elucidated.Combined with the characteristics of steel rail abrasive belt grinding process,a calculation model for heat flux density in the semi elliptical contact area was obtained and verified.Based on the above research results,the temperature field of the moving surface heat source with continuous action in the semi elliptical contact area is solved by discretization.Research has shown that under the set grinding process parameters,the simulation and theoretical temperature changes of the rail grinding surface in the semi elliptical contact area are similar and almost reach the maximum temperature at the same time.The relative error between the simulation and theoretical maximum temperature is 6.14%.Comparative analysis of theoretical calculations and simulation of maximum temperature under different grinding speeds shows good consistency in size and trend.The correctness of the above theoretical model has been verified through existing research results.This study proposes a new method for calculating the tem-perature field in the actual semi elliptical grinding area considering the rail profile,which has important the-oretical significance for the calculation of the temperature field and stress field in the grinding area.展开更多
基金Supported by National Natural Science Foundation of China(Grant No.52275399).
文摘During the process of rail grinding,the local high temperature generated in the grinding contact area can affect the physical properties of the rail,thereby affecting its service performance.Therefore,studying the temperature field of rail grinding is of great significance for improving the quality of rail grinding.In this paper,a calculation model for the grinding depth and contour of the semi elliptical contact area was established based on the contact geometry relationship between the steel rail and the abrasive belt for the first time,and the influence of grinding process parameters on the parameters of the contact area was elucidated.Combined with the characteristics of steel rail abrasive belt grinding process,a calculation model for heat flux density in the semi elliptical contact area was obtained and verified.Based on the above research results,the temperature field of the moving surface heat source with continuous action in the semi elliptical contact area is solved by discretization.Research has shown that under the set grinding process parameters,the simulation and theoretical temperature changes of the rail grinding surface in the semi elliptical contact area are similar and almost reach the maximum temperature at the same time.The relative error between the simulation and theoretical maximum temperature is 6.14%.Comparative analysis of theoretical calculations and simulation of maximum temperature under different grinding speeds shows good consistency in size and trend.The correctness of the above theoretical model has been verified through existing research results.This study proposes a new method for calculating the tem-perature field in the actual semi elliptical grinding area considering the rail profile,which has important the-oretical significance for the calculation of the temperature field and stress field in the grinding area.
