【作者】 徐伟；

【导师】 张凌云；

【作者基本信息】 沈阳航空航天大学 ， 航空宇航制造工程， 2012， 硕士

【摘要】 航空发动机叶片是航空发动机重要部件之一,叶片是一个复杂的自由曲面零件,成形特别困难,叶片的设计和成形精度直接影响航空发动机的性能。传统航空发动机叶片的成形方法费时费力,精度还低。钛合金的叶片,由于材料的特性冷成形时回弹比较大、屈服强度也高,不易成形。但是利用超塑成形技术把材料加热到一定温度,材料进入超塑性后特别容易贴膜和成形,解决了加工困难的问题。这项技术的成形过程是非常复杂的一个过程,需要控制的参数多如:温度、摩擦系数,压力和时间的关系等。不同参数的组合对成形质量影响很大,厚度分布也不均匀,利用实验去验证浪费时间和财力,所以通过计算机利用有限元软件进行成形模拟优化参数、改善厚度分布有着十分重要的作用。本文给出了宽弦空心风扇叶片的结构、材料、成形工艺,重点分析了超塑成形与扩散连接工艺的特点。本文根据超塑成形的工艺要求,利用有限元软件MSC.MARC对空心风扇叶片进行数值模拟分析。比较不同参数对成形和厚度分布的影响,优化参数得出优化P-T曲线。本文对叶片试验件的厚度进行测量,验证有限元软件模拟的结果正确性,为以后研究提供依据。更多还原

【Abstract】 The hollow fan blade is one of the most important parts in the aereoengine, the blade is a complex free-form surface part and form into the hollow fan blade is especially difficult. The design of the blades and the forming precision directly influence the aviation engine performance , the formation of the traditional aviation engine is time-consuming , and also the precision still low , but titanium alloys blade , due to the characteristics of the material is easier to springback when cold forming and the yield strength is also difficult to form, but by using the SPF technology and heating the material into a definite temperature , the material after the superplastic forming (SPF) is easy to patch ,which can solve the difficult problem in processing. The technology of forming process is very complex, so we need to analyze the parameters such as temperature, coefficient of friction, pressure with the time. The combination of different parameters on the forming quality is affected the thickness distribution that is not even, and it is also a waste of money and time to verify with the experiment, so using the MSC.MARC one the computer to form the simulation optimization parameters is a very important role to improve the thickness distribution.This paper shows the structure, materials and SPD/DB of the hollow fan blades especially the characteristics of SPF/DB(Superplastic Forming/Diffusion Bonding) , the SPD/DB is accord to the design of the hollow fan blades and accuracy requirement , by using the element software MSC .MARC to analyze the numerical simulation analysis of the hollow fan blades, comparing different parameters on the forming and the influence of thickness distribution , the optimized parameters form the optimization P-T curveA test of the blade thickness measurement also veries the correctness of the finite element software simulation results in the paper , which provides the basis for the future research .更多还原