The Design And Optimization Of Machine Tool For Grinding Of Aero Engine Precision Forged Blade Edge

Aero-engine blade is one of the most important parts in the aero-engine.The section shape and surface quality of the blade has a significant impact on the life,reliability,efficiency of the aero-engine.Currently, the processing technology of the new aero-engine blades is: Firstly,to ensure the forming accuracy of the blade surface by precision forging, then milling the straight edge of the blade edge,Finally,complete the processing of the leading and exhaust edge of the blade with the manual grinding.Although this technique avoids the complex process of the blade surface,it can not achieve high-precision automatic processing of the blade edge surface.It has poor machining accuracy and molding consistency on the blade edge,and the low production efficiency.According to its defects of the processing,this paper designed a NC belt grinding machine for processing the leading and exhaust edge of the blade.The machine used belt grinding for the difficult to machine material of the aero-engine blade, it has a highly efficient material removal rate, strong processing adaptability and well surface quality.The grinding unit of the machine driven by servo motor with the structural arrangement of spring floating grinding to achieve rapid response of the input excitation for the complex structural characteristics of the blade edge surfaces and the grinding allowance inhomogeneity to adapt to the change of the blade edge surfaces.The main work includes:Firstly,analyzing the processing requirements of the aero-engine blade edge of precision forging and belt grinding characteristics to determine the method of the blade edge cutting.Research on the basic movement required by belt grinding to determine the required by machine basic motion axes.Secondly, based on the experiment of blade edge surface grinding with the belt grinding machine of blade surface,analysis of the problems of it in the processing of the blade edge surfaces.Then design a new floating belt grinding mechanism that it has a fast dynamic excitation response to aiming at its problems.It can adapt to that the complex structure of the blade edge surfaces and the grinding allowance inhomogeneity to meet the high demand of the blade edge surface machining accuracy and surface quality.Design the structure of the B axis parts and build the 3D model of the grinder.Carry out NC machining simulation of the grinder and check its interference and collisions in the process to verify the feasibility of the grinder model in theory.Finally,based on the dynamic simulation of the belt grinding mechanism, the key parameters optimization has been completed for the grinding mechanism with the experimental design method that to analysis of simulation results.Then belt grinding mechanism has a fast dynamic excitation response to meet the processing requirements of blade edge surface.Based on the dynamic simulation of the two structures of B axis parts,analysis the advantages of they.Made mode analysis of the grinder bed parts by using finite element to obtained the natural vibration frequency of the grinder to verify the reliability of the grinder.