窄通道整体叶轮套料电解加工过程稳定性研究

Research on Stability of Electrochemical Trepanning Machining Process for Narrow Channel Integral Impeller

等截面叶片整体叶轮广泛应用在航天及武器装备发动机上,套料电解加工在降低等截面叶片加工成本和提高加工效率方面具有显著优势。针对窄通道整体叶轮套料电解加工过程中存在的稳定性问题,创新设计了复合阴极和封闭式流场工装夹具,据此开展了电解加工验证试验。试验结果表明,复合阴极能有效解决叶顶圆和叶根圆叶片间距差异大带来的不稳定问题,封闭式流场改善了加工区域电解液压力及流速分布均匀性,叶片加工表面质量高、加工过程稳定,为窄通道整体叶轮优质高效电解加工奠定了技术基础。

The integral impeller with uniform-section blade is widely used in engines of aerospace and weaponry.The electrochemical trepanning machining has obvious advantages in decreasing the machining cost and improving the machining efficiency of uniform-section blade.In order to solve the stability problem in the electrochemical trepanning machining process of narrow channel integral impeller,the composite cathode and tooling fixtures with closed flow field were designed innovatively,and the electrochemical machining verification test was carried out.The results show that the composite cathode can effectively solve the instability problem caused by the large difference between the vane spacing of the blade tip circle and the blade root circle.The closed flow field improves the distribution uniformity of electrolyte pressure and electrolyte velocity in the machining region.The surface quality of blade is high,and the machining process is stable,which lays a technical foundation for the high quality and efficient processing of the narrow channel integral impeller.