Study On Forging Process Of Titanium Alloy Structural Parts For A Certain Aircraft

TC4 Titanium Alloy is the most widely used,most mature,the largest production of two-phase alloy materials,with moderate strength and moderate plasticity,widely used in aerospace,military,medical and many other industries.The hanging joints of the material are one of the most important components in the structure of C919 large civil airliner in our country,which is usually prepared by die forging process.The manufacture of the die forgings is difficult,the process quality is not stable enough,and the product qualification rate is low.Therefore,through the TC4 titanium alloy hanging joints die forging process research,it has a practical significance to the construction of China's large-scale civil airliner.Taking TC4 titanium alloy hanging joints as the research object,considering the forging forming and processing process,the forging and forging dies of the part are designed.Three kinds of die forging process schemes are preliminarily formulated on the basis of considering the shape,orientation and quality of precast billet.The true stress-strain curves of TC4 titanium alloys under different deformation conditions are obtained by thermal compression test on GLEEBLE-3800 thermal simulation test machine,and the data is provided for the material model in the subsequent FEM simulation.Using DEFORM-3D finite element analysis software,based on the rigid-plastic fem model,the three forming process schemes of the hanging joint die forgings are numerically simulated,and the simulation results of forging process,filling quality,temperature field distribution and strain field are analyzed,and the optimum process plan for the hanging joint die forging is determined.By combining the orthogonal experiment design with the numerical simulation method,the three-factor orthogonal test is designed to be the factor of billet forging temperature,mould preheating temperature and mould pressing speed.This paper analyzes the influence regularity of each factor level on the highest temperature,average equivalent strain,maximum forming load and so on,determines the order of primary and secondary factors influencing the index,comprehensively discusses and obtains the optimum level of each factor,and finally determines the die forging process of TC4 titanium alloy hanging joint forgings.