Material Removal Mechanism And Burn Suppression In Robotic Belt Grinding Of Blade Edges

One of the important prerequisites for the promotion and application of blade robotic belt grinding technology is to break through the high-quality machining problem of thin-walled edges(leading and trailing edges)of blades.The reason is that the leaf edge fillet radius changes greatly,the surface is complex,and the leaf edge profile and roughness are required,which caused the leaf edge and the leaf body to be intact,poor surface finish and local ablation.Especially for titanium alloy difficult-tomachine material blades with low thermal conductivity and heavy viscosity,even if the abrasive belt grinding is known as "cold grinding",and the force load applied at the edge of the blade is generally maintained at a low value,but the heat in the narrow contact area of the tool-leaf edge is easy to accumulate and is not easy to dissipate heat,which can easily lead to burns and poor surface integrity at the edge of the blade.In view of the above problems,this paper takes a certain type of titanium alloy blade as the research object to carry out research on the material removal mechanism and burn inhibition of the robot abrasive belt grinding at the leading and trailing edges of the blade.The main research contents of the full text are as follows:Firstly,based on hertz elastic contact theory and Preston’s equation,a model of the depth of removal of blade edge material is established.The premise of accurate prediction of blade edge grinding temperature is to establish a reasonable material removal depth model,so considering the contact elastic deformation between the workpiece and the tool in the grinding process by introducing the correction coefficient of the grinding pressure distribution in the actual grinding process.A model of the depth of material removal by the robot abrasive belt grinding of the leading and trailing edge of the blade is established,and the model is verified by experiments.Secondly,aiming at the problem that the leading and trailing edges of the blades are prone to burns during the grinding process,a robot grinding temperature prediction model for the leading and trailing edges of the blade with contact elastic deformation is established,and the finite element simulation method is used to simulate the grinding temperature field of the leading and trailing edges in the grinding process,to explore the influence of different process parameters on the grinding temperature,and to measure the grinding temperature of the leading and trailing edges online which verifies the accuracy and feasibility of the model and the finite element simulation method.Thirdly,the surface quality of the anteroposterior margins of the leaves was studied experimentally in preparation for subsequent burn inhibition studies.By measuring and observing the surface roughness,surface micromorphology and surface metallographic structure of the leading and trailing edges of the blades after grinding,and exploring the influence of different processing process parameters on the grinding quality of the leading and trailing edges,it can be seen that the load at the leading and trailing edges of the blade should not be too large and extremely sensitive to changes in process parameters,and then the optimization of process parameters is proposed.Finally,based on the above surface quality research,two indicators characterizing the grinding quality of the leading and trailing edges of the blades were determined,and the process parameters in the process of the leading and trailing edges were optimized by using the response surface optimization method to ensure the grinding quality of the leading and trailing edges,avoid the occurrence of defects such as surface burns,and the optimization results were verified by experimental methods,which confirmed the reliability of the optimization results.Through theoretical modeling,finite element simulation and experimental methods,robotic belt grinding at the leading and trailing edges of the blades is investigated,which can effectively avoid the occurrence of grinding burns at the leading and trailing edges,significantly improve the grinding and polishing processing quality of the leading and trailing edges,and meet the processing technology requirements of the blade edges.