Belt Grinding And Polishing Technology Of Airspeed Tube And Its Application

As an important speed measuring device installed outside the aircraft,the working environment of the airspeed tube is very harsh,and the machining accuracy and surface quality have a huge impact on its service performance.After the front,rear cheeks and other parts are cast at high temperature,airspeed tube is formed by welding these parts.Then,belt grinding and polishing are used to remove the remaining welds on the profile and improve the surface quality.At present,the grinding and polishing of airspeed tubes is still at the stage of manual operation,and there is an urgent need to carry out research on NC belt grinding and polishing methods and equipment for airspeed tubes.Therefore,in this paper,according to the grinding and polishing process characteristics of the airspeed tube,a NC belt grinding and polishing scheme is firstly developed.Then,the NC belt grinding and polishing methods of airspeed tubes are studied.After that,the key algorithms of NC belt grinding and polishing for airspeed tubes are designed,and two software are developed.Finally,the simulation verification and experimental research are finished.The main research work is as follows:First of all,in view of the grinding and polishing difficulties of the complex structure of the airspeed tube profile and the uneven distribution of welds,an airspeed tube NC grinding and polishing process scheme with integrated measurement and processing is developed.An airspeed tube NC belt grinding and polishing system integrating industrial robots,blue light scanners,and abrasive belt grinding and polishing machines is constructed,and a control and communication scheme for the machining system based on Industrial Ethernet is proposed.Secondly,the parametric line method is used to plan the grinding and polishing trajectory of the airspeed tube profile,and the step length and line spacing are calculated.By optimally matching the airspeed tube measurement point cloud data with the design model,the airspeed tube processing reference is located and the airspeed tube profile machining allowance is calculated.A method for identifying the welds of airspeed tubes based on the machining allowance distribution is proposed.At the same time,by collecting experimental data,then,training,verifying and testing the data samples,an airspeed tube material removal estimation model based on a neural network algorithm is established.Then,the motion control model of the machining system is established,and the grinding and polishing machining pose of the robot is solved.Meanwhile,based on the welds identification method,an adaptive grinding algorithm for airspeed tube welds is proposed and the control process of each stage of automatic grinding and polishing of airspeed tube is designed.On the basis of algorithm analysis,the special software for airspeed tube grinding and polishing and the control software of the machining system are both developed.Finally,a simulation environment for airspeed tube grinding and polishing is set up in Robot Studio software,and the correctness and feasibility of the processing method are verified by simulation results.On the basis of simulation,a certain type of airspeed tube is taken as an object,and the automatic grinding and polishing experiment of airspeed tube is carried out on the actual machining system,and the experimental results are analyzed,the reliability and stability of the machining system are tested.