Machining Error Analysis Of Laval Nozzle

Laval nozzle is an important component part of the engine,which relies on the geometrical characteristics of the expansion after the internal cavity contraction first to generate power,and is widely used in aviation,aerospace and military fields.The Laval nozzle of a engine part is a complex rotary part,which has many kinds of processing process,complicated process flow,and the factors affecting the machining precision,so it can't control the precision of machining process effectively.If the use of advanced lathe and milling machining Center for processing,although to a certain extent improve the processing accuracy,but this not only increase the cost and greatly reduce the production efficiency,can not meet the nozzle batch demand processing requirements.The machining process of Laval nozzle is mainly the cutting process,which is characterized by high efficiency.The machining errors caused by cutting tool deformation,deformation and vibration of parts are seriously affecting the machining precision and surface quality,so it is very important to analyze the machining process of Laval nozzle to improve machining precision and improve engine performance.Therefore,this paper takes Laval nozzle machining process as the research object,combining engineering calculation and FEM simulation technology to reveal the physical relationship between the influence factors and machining precision of Laval nozzle production process,and provide theoretical basis for process design.It is very important to improve the dimension precision of laval nozzle and improve the surface quality.Based on the analysis of the machining technology characteristics of Laval nozzle,the thermodynamic coupling model of the material cutting process of Laval nozzle is established.According to the simulation test of cutting process,the numerical calculation model of cutting mechanics is established,the simulation process and loading method of FEM are analyzed,and the deformation problem of Laval nozzle and cutter in machining process is studied.Through the establishment of the finite element model,combined with the actual machining characteristics,the influence of cutting parameters,tool geometry and cooling medium on the machining process is obtained,and the influence of influencing factors on Laval nozzle material is clarified.By establishing the finite element cutting model and combining with the machining characteristics,the influence of cutting parameters,tool geometry and cooling medium on the machining process is analyzed,and the influence of influencing factors on the material of Laval nozzle is clarified.By means of fem simulation,the influence of cutting performance and processing factors on Laval nozzle material is studied.The machining process of Laval nozzle is simulated by means of simulation,and the machining error of Laval nozzle is obtained.The machining error caused by the deformation of the machining system is deduced by the method of mathematical modeling.It lays a theoretical foundation for further study on the precision machining process of Laval nozzle.