| The blade is the core component of the aero engine,and its surface integrity characteristics have a great influence on the fatigue life and airflow dynamic performance in the service environment.However,high-quality precision machining of the blade surface has been the number one problem for experts in the aviation industry.At present,although the abrasive belt grinding technology has been successfully applied in the field of precision machining of aerial hair blades.However,the surface of the abrasive belt grinding is mainly composed of lateral texture.Moreover,the surface integrity characteristics and distribution of the texture are likely to cause defects such as microcracks and surface microstructure changes under high temperature,high frequency loads.The longitudinal abrasive belt grinding method based on the micro-reinforced ribs mechanism can form a longitudinal texture on the surface.This is beneficial to improve the static and dynamic fatigue life of the blade.However,due to the lack of research on the longitudinal abrasive belt grinding technology and surface texture forming of titanium alloy blades,the scientific evaluation of this new grinding method is lacking.Aiming at the above problems,this paper studies the longitudinal abrasive belt grinding method of micro-reinforced ribs of aero-engine titanium alloy blades through the combination of modeling and simulation and experimental verification.The grinding rule of the micro-reinforced ribs abrasive belts is revealed,and the longitudinal abrasive belt grinding method of micro-reinforced ribs of titanium alloy blades is established.The main research contents of the specific completion are as follows.(1)Study on the mechanism of micro-reinforced ribs surface and its abrasive belt grinding method.Firstly,under the premise of fracture mechanics theory and surface mechanism of reinforced ribs,the surface action mechanism and typical structural characteristics of micro-reinforced ribs were analyzed.Then,the mechanism of grinding and removal of single-grain longitudinal abrasive belt was studied,and a parametric mathematical model of longitudinal abrasive belt grinding was established.Finally,the basic experimental platform of micro-reinforced ribs abrasive belt grinding with titanium alloy as the typical material was built,and the grinding method of micro-reinforced reinforced abrasive belt on the surface of titanium alloy was verified.(2)Research on grinding rule of micro-reinforced ribs abrasive belt of titanium alloy material.Based on the micro-reinforced ribs structure abrasive belt grinding method,a standard test platform was built,and the micro-reinforced ribs abrasive belt grinding test of titanium alloy thin-walled plate was completed by changing the grinding process parameters.After the processing results of the test,the influence relationship between the grinding parameters of the abrasive belt on the surface roughness of the micro-reinforced ribs and its structural characteristic parameters was analyzed.(3)Grinding planning and model simulation of full-surface micro-reinforced ribs abrasive belts for aero-engine blades.Firstly,the trajectory planning of the longitudinal abrasive belt grinding of the full-profile micro-reinforcing ribs of the aero-engine blades is analyzed.Then,the planar dimension design and spatial structure modeling of the blade full-face micro-reinforced ribs were carried out.Finally,static and modal simulations of the full profile of the blade were carried out by ANSYS finite element software,and the simulation results of the micro-reinforced ribs with or without ribs were compared.(4)Experimental verification study on micro-reinforced ribs abrasive belt grinding of aero-engine titanium alloy blades.Firstly,a certain type of aero-engine compressororiented titanium alloy blade was used as experimental material to build a microreinforced ribs abrasive belt grinding experimental platform.Then,the surface integrity parameters of the processed blades were tested and the results were compared and analyzed.Finally,the experimental method for the grinding of the longitudinal abrasive belt of the micro-reinforced ribs of the aircraft hair titanium alloy blade was carried out. |
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