Research On Coupling Of Grinding Stress Of Straight Circular Guide With Straightening Load History

Straightening is a process of ensuring the straightness of metal strip parts by changing the degree of bending of the parts.According to the elastoplastic bending theory,residual stress is generated inside the workpiece.In order to improve the efficiency of straightening processing,the linear circular guide is taken as the research object.Based on the analysis of the stress evolution law of single straightening,the iterative model of multiple straightening stroke prediction and the residual stress distribution during the straightening process are studied,and verified by theoretical analysis and experimental methods.At the same time,the grinding process is an important processing process in mechanical manufacturing.It causes local high temperature in the grinding area,which affects the size and distribution of residual stress on the surface of the workpiece.Therefore,in this paper,the residual stress of the linear circular guide after multiple straightening is considered as the prestress,coupling with the residual stress field generated by the grinding process,and carrying out simulation research to explore the law of stress change.The main contents and work are as follows:(1)According to the theory of elastoplastic mechanics and elastoplastic deformation,the stress distribution law of straight circular guide rail during straightening process is analyzed,and the straightening stroke calculation process and the trip prediction model in the elastoplastic deformation stage are established.Then the iterative travel prediction model in multiple straightening processes is derived.The deflection and stress are calculated by MATLAB and Workbench.The correctness of the multiple straightening stroke prediction model is verified by the test method.(2)The grinding temperature field is analyzed by theoretical analysis and calculated.The variation of the temperature field on the workpiece at different times and the stress distribution of the temperature field on the workpiece at different grinding depths are obtained through the method of finite element analysis by using ANSYS analysis software.Using the sequential coupling method,the temperature field analysis is converted into the structural analysis.Appling the grinding force by selecting the appropriate grinding point,the stress distribution of the workpiece under the temperature field and the grinding force is calculated.The variation and distribution of the residual stress field of the workpiece are obtained when the workpiece is being grinded.(3)Taking the linear circular guide of 45 steel as the research object,the residual stress of the workpiece after multiple straightening is used as prestress,which is sequentially coupled with the thermal coupling residual stress of the grinding process.The variation law and distribution law of coupled residual stress field under different grinding parameters are obtained through the method of finite element analysis by using ANSYS analysis software.The distribution of the residual stress field of the circular guide rail under the effects of the straightening process and the grinding process is explored.The effects of different processing techniques on linear circular guides are summed up to lay the foundation for further research in the future.