Research On The Dynamic Performance Of High-speed Precision Roll Grinding Head

With the rapid development of high-speed and ultra-high-speed grinding technology in the manufacturing industry,the requirements for the workpiece processing quality and processing efficiency of roller grinder are becoming higher and higher.As the core component of roll grinder,the performance of grinding head is related to the realization of high-speed precision grinding technology in roll grinder.As a key index to measure the grinding head,the research on dynamic performance is of great significance for improving the ability of high-speed precision roll grinder to resist self-excited vibration and forced vibration.The dynamic performance of the grinding head has been mainly study from the following aspects.Firstly,the overall structure,main parts and working principle of the designed high-speed precision roll grinding head are introduced in detail,and the force of the grinding head and its spindle system are analyzed and calculated,laying the foundation for the later research on dynamic performance.Secondly,the modal and harmonic response of the grinding head is analyzed to study its dynamic performance.Through the analysis of the simulation results,the key parts with weak dynamic performance of the whole machine are found out,which are hybrid bearing,box body,joint fork,grinding wheel chuck and unloading device.It provides an optimization direction for the subsequent improvement of the dynamic performance of the grinding head,that is,improving the stiffness of each weak part to promote the overall dynamic performance of the grinding head.Then,the particle swarm optimization algorithm is used to optimize the structure of the hybrid bearing with the optimization objective of minimum total power loss per unit load,and the fluid-structure coupling analysis is carried out on the optimized bearing.The results showed that the structural strength and stiffness of the optimized bearing meets the design requirements.After that,according to the results of bearing optimization,the grinding head model is compacted to improve its dynamic performance and stability,and then the structure of other key parts with weak dynamic performance is optimized.Topology optimization is carried out for the box body with the goal of lightweight,and the optimized box body is added with a reasonable layout of meters to improve the dynamic performance.The influence of different structure sizes of joint fork and grinding wheel chuck on its inherent frequency is studied,and choose the optimal design size to improve their dynamic performance.The effects of different material parameters on the inherent frequency of the unloading device were studied,and it provides a reference for its selection of materials.Finally,the modal and harmonic response analysis of the optimized grinding head is carried out,and the comparison with the results before optimization shows that the inherent frequency of the optimized grinding head increases obviously,the structural stiffness and strength increase overty,and the dynamic performance is improved to meet the relevant requirements.