Design And Analysis Of Rail Surface Grinding Device

As a railway maintenance technology which can effectively improve the wheel-rail contact performance,rail grinding plays an increasingly important role in improving the stability and safety of train operation.The existing rail grinding train mainly uses the end face of grinding wheel to grind the rails.In recent years,foreign countries have carried out research on grinding technology based on grinding wheel circumferential surface,and developed the related grinding equipment.Compared with grinding wheel end face grinding,curved surface grinding has the characteristics of adapting to a variety of rail profiles,and the curved surface of rail profile is fuller after grinding,and the equipment volume is smaller.Based on the analysis of the existing rail grinding equipment and grinding technology,this paper designs a rail surface grinding device.The main research contents are as follows:According to the analysis of the technical requirements of the rail grinding device,the rail profile,and the rail grinding technology,the overall structure of the rail curved surface grinding device is proposed;through the analysis of the composition of the grinding movement,the grinding profile interval,the space size limitation,the grinding unit structure plan,unit arrangement mode and unit adjustment structure plan are determined;a three-dimensional digital virtual model of the new rail surface grinding device was established,and the movement simulation analysis of the grinding unit was carried out to verify the feasibility of the structure and its transmission scheme.The ANSYS Workbench software is used to analyze the static stress of the whole machine frame,grinding wheel shaft and U-shaped bracket.According to the obtained results of the stress and deformation displacement cloud diagram,the structural optimization of the parts whose deformation displacement is too large and does not meet the strength requirements is optimized,so that the important parts meet the strength and rigidity requirements.The internal and external excitation frequency of the grinding device is analyzed.The modal analysis was carried out on the frame of the whole machine,the U-shaped bracket and the grinding wheel shaft,and the modal frequencies were extracted and compared with the internal and external excitation frequencies.The important components with close frequencies are optimized,and the optimized structure is verified.The optimized structure improves the natural frequency while meeting the requirements of strength and rigidity.A three-dimensional model of the surface morphology of abrasive particles and grinding wheels was established,and the grinding of abrasive particles and wheels was simulated and analyzed by DEFORM-3D.The results show that the stress in the extrusion area where the abrasive particles are in contact with the workpiece is higher and the temperature in the contact area is higher;the grinding force increases with the increase of grinding depth and feed speed,and decreases with the increase of grinding wheel speed,the increase of grinding depth has a significant effect on the change of grinding force;there are multiple groove marks and overlaps on the surface of the workpiece after grinding,which is the result of multiple actions of multiple abrasive particles.It provides a reference for the setting of rail grinding parameters.