扭转叶片整体叶盘旋转套料电解余量均匀化加工技术研究

Research on Margin Homogenization Technology of Electrochemical Rotary Trepanning Machining for Twisted Blisk

扭转叶片整体叶盘广泛应用在航空发动机上,而旋转套料电解加工在整体叶盘叶间通道大余量高效去除方面具有显著优势。针对扭转叶片整体叶盘旋转套料电解加工后存在的余量分布不均匀问题,提出了一种基于侧面间隙预测的变电压均匀化余量旋转套料电解加工方法,通过电场仿真确定侧面间隙和电压之间的关系,并开展了恒定电压与变电压旋转套料电解加工对比试验。结果表明,采用变电压加工后扭转叶片的最大余量差值由1.63 mm降至1.12 mm,余量分布情况得到显著改善,为后续叶片型面电解精加工奠定技术基础。

The twisted blisk is widely used in aero-engines,but the electrochemical rotary trepanning machining has an obvious advantage in the efficient removal of large margin of the blisk channel.Aiming at the problem of uneven distribution of allowance after electrochemical machining of twisted blisk rotating nesting,an electrochemical machining method of homogenization allowance rotating nesting based on side clearance prediction of variable voltage was proposed,and the relationship between side clearance and voltage is determined by electric field simulation,according to which a variable voltage processing scheme that can homogenize the margin was formulated,and a comparative test of constant voltage and variable voltage rotary nesting machining method was carried out.The result showed that the maximum margin difference of twisted blades after variable voltage processing is reduced from 1.63 mm to 1.12 mm,and the margin distribution is improved which lays a technical foundation for subsequent electrochemical finishing.