Design And Simulation Analysis Of Forging Process For Titanium Alloy Connection Frame Of Aircraft

Titanium alloy connection frame is located between the engine and the wing of the aircraft.It bears the vibration load and noise load of the aircraft all the year round.It is one of the important parts of the aircraft.Due to the complex shape of its forging parts and the large change of its section shape,the connection frame is prone to defects such as uneven deformation or unfilling.In this paper,the titanium alloy connection frame is taken as the research target,and a new connection frame forging process is proposed to solve the problems of un-filling,uniform flash and unstable production of preforging in the trial production process,and put the new production technology into the production plan.The main research work of this paper is as following:(1)In this paper,firstly,the characteristics of the connecting frame parts was analyzed,and then,combined with the actual production situation,the problems in the connection frame trial production scheme were analyzed.Through analysis,it was found that there was a problem in the trial production program,that was,the preforging filling was not enough,the forging accessories were too much,the flash were not evenly distributed,it is difficult to blocking and unstable in production.Since there were many orders for this product in the future,this trial production scheme was not suitable for mass production.It was necessary to design a new connection frame forging process from the forging design.(2)Starting from the rough work of the product,the final forgings of the product were designed,and the form of the flash gutter was determined on the basis of the final forgings,and then the final forging die for connecting frame was designed.(3)Based on the designed final forgings of the connection frame,the preforgings of the connection frame were designed,the filling condition,the effective strain distribution and the forming load of the preforgings in the process of the final forging were analyzed.In addition,the possible defects of the preforgings in the process of final forging,such as folding was analyzed.After the modification of the unreasonable design of the preforgings,finally,the design scheme of preforgings with low maximum forming load,low deformation uniformity and no obvious defects was obtained.And the corresponding preforging die was designed.(4)On the basis of the designed preforging die,two different prebillet schemes were designed.The effectivet strain distribution,forming load and die stress of the two schemes in the process of preforging were compared and analyzed.Combined with the production practice and simulation results,the prebillet scheme 2 was selected as the preforging scheme.Then,by comparing the forming load,die stress,deformation uniformity and the maximum damage value of forgings in the process of preforging under different preforming parameters,the appropriate preforming process parameters were determined.Through the above work,the forging mold shape of the connection frame and the blocking process were determined,so as to obtain the whole die forging production process of the connection frame.The production process scheme was applied to actual production and satisfactory results were obtained,and the results showed that the numerical simulation and process design were correct.