航空发动机整体叶盘叶片预变形控制研究

Pre-Deformed Control Technology for High-Pressure Compressor of Blisk Blade

数控加工是航空发动机整体叶盘最主要的加工方法,数控加工工序是保证整体叶盘几何精度符合设计要求的重要环节。按照设计三维数模精铣后的叶片型面虽满足图纸尺寸公差,但后续叶片表面光整及强化工艺会对叶型特征产生不同程度的影响,导致最终叶型几何特性超出设计要求。通过对抛光、振动光饰、喷丸等表面光整及强化工艺进行分析,确定其对叶型参数的影响规律及量值,再根据预变形技术对精铣工序的加工模型和程序进行修正,使叶片在精洗后获得与后续表面光整及强化工艺变形规律相反的形状和位置,再在后续加工中消除这些预变形量,从而达到在最终交付状态获得合格整体叶盘的目标。

The NC machining is the most important processing method for the blisk of aero-engine.The NC machining process is an important step to ensure that the geometric precision of the blisk meets the design requirements.According to the design of three-dimension digital model,the shape of the blade after finish milling can meet the dimensional tolerance of the drawing,but the flow-up blade surface finishing and strengthening process have different degrees of infullence on the character of the blade shape of the blisk,resulting in final geometric dimensions of the blade shape beyond design requirements.By analyzing the surface finishing and strengthening process such as polishing process,vibratory finishing process,shot peening process,the paper determine its influence law and magnitude on the blade shape parameter,then according to the pre-deformed control technology,revise the machining model and program of the finishing process,allowing the blade to obtain the shape and position opposite to the deformation law of the subsequent surface finishing and strengthening process after finishing milling.At last,eliminate these pre-deformations in subsequent processing to achieve the goal of obtaining a qualified blisk in the delivery state.