Research On Vibration Reduction Of Torque Tube Milling Process For Groove CSP

With its wide application range,stable power generation process,long working time,and large installed capacity,the trough solar thermal power generation technology has a very broad commercial application prospect in the central and western regions of my country.The torque tube,which is a supporting member of the trough CSP,is a thin-walled tubular structure with low rigidity and long span.When milling the connecting end faces,it is easy to produce milling vibration problems and the stability of the milling processing system.It is difficult to guarantee.In order to solve these problems,this article takes the torque tube for groove type CSP as the analysis target,and carries out the modal analysis of the torque tube milling processing system,the modeling of the dynamic milling force of the vertical multi-edge milling cutter,and the low-rigidity workpiece Dynamic modeling and milling processing system stability analysis,torque tube fluid sloshing vibration analysis and other research work.Its main content includes the following aspects:First of all,after analyzing the milling processing system of the torque tube,the processing system is simplified into two independent sub-milling processing systems,and the modal simulation analysis of the two subsystems is carried out to obtain the modal data that is most in line with the actual milling processing To provide necessary data support for the stability analysis of the subsequent milling machining of lowrigidity workpieces.Secondly,by analyzing the mechanism of milling,this paper obtained the method of dynamic milling force calculation using micro-element method,integrating the micro-element instantaneous milling force on one of the milling edges of the milling cutter along the direction of the main axis of the milling cutter,thus The dynamic milling force model of the entire multi-edge milling cutter was established.Finally,the radial and tangential milling force coefficients of the milling system were obtained by fitting the dynamic data of the milling force,and the dynamic milling force modeling was verified by the milling process test.accuracy.Then,based on the modal analysis of the torque tube milling processing system and the modeling work of the dynamic milling force of the milling processing system,a dynamic model of the milling process of the low-rigidity workpiece was constructed to analyze the stability of the milling process of the low-rigidity workpiece Based on the stability model,this paper proposes a method for predicting the stability of the milling process of low-rigidity workpieces,that is,judging whether the chattering phenomenon occurs in the milling system by selecting the milling parameters at the position of the milling stability line graph,and finally using milling The machining stability test verified the accuracy of the model and prediction method.Finally,according to the structural analysis results of the torque tube,a method for filling the torque tube with a certain amount of liquid to suppress the vibration of the torque tube milling is innovatively proposed,and the principle of the power tuning damper and the vibration of the vibration liquid are analyzed.The equivalent mechanical model of sloshing liquid is established based on the dynamics of the device.The Fluent software was used to build a simulation model of torque tube liquid sloshing,and the feasibility of the proposed method was verified by the results of simulation calculations.