摘要：The Ti-5Al-2Sn-4Zr-4Mo-2Cr-1Fe(β-CEZ)alloy is considered as a potential structural material in the aviation industry due to its outstanding strength and corrosion *** machining(ECM)is an efficient and low-cost technology for manufacturing theβ-CEZ *** ECM,the machining parameter selection and tool design are based on the electrochemical dissolution behavior of the *** this study,the electrochemical dissolution behaviors of theβ-CEZ and Ti-6Al-4V(TC4)alloys in NaNO3solution are *** open circuit potential(OCP),Tafel polarization,potentiodynamic polarization,electrochemical impedance spectroscopy(EIS),and current efficiency curves of theβ-CEZ and TC4 alloys are *** results show that,compared to the TC4 alloy,the passivation film structure is denser and the charge transfer resistance in the dissolution process is greater for theβ-CEZ ***,the dissolved surface morphology of the two titanium-based alloys under different current densities are *** low current densities,theβ-CEZ alloy surface comprises dissolution pits and dissolved products,while the TC4 alloy surface comprises a porous honeycomb *** high current densities,the surface waviness of both the alloys improves and the TC4 alloy surface is flatter and smoother than theβ-CEZ alloy ***,the electrochemical dissolution models ofβ-CEZ and TC4 alloys are proposed.

摘要：整体叶盘的高效、低成本制造已成为航空发动机研制和批量化生产中的关键问题。增加电极数量进行多工具同步电解加工（Electrochemical machining, ECM）是提升整体叶盘叶栅通道加工效率的有效方法。但是由于叶栅通道的复杂结构和狭窄形状，工具通常需要通过多轴联动进给实现加工，然而，多工具同步联动进给加工不易实现。基于此，本文提出基于靠模结构的多通道旋进ECM方法，在设计运动轨迹的基础上开展了靠模槽结构的优化设计。利用面积最小法确定阴极最优进给方向和不同进给位置下工具阴极的最优旋转角度。基于运动轨迹，利用最小二乘法、样条插值法、直线连接法拟合设计出不同靠模槽结构。仿真显示，基于最小二乘法拟合出的靠模槽速度变化最平滑，余量分布最均匀。最后，开展多通道旋进电解加工试验，加工出的叶栅通道余量差在1.1 mm以内，一致性误差在0.3 mm以内。

摘要：[目的]为进一步提高柴油发动机的燃油效率,降低发动机零部件的更换和维修成本,对利用电解加工技术去除燃油喷射体内交叉孔相贯处的锐边和毛刺,且精确控制过渡圆弧半径进行研究。[方法]基于COMSOL Multiphysics建立电解加工交叉孔相贯处过渡圆弧的加工过程模型,研究阴极结构、加工时间对过渡圆弧半径的影响规律,并对阴极结构进行优化设计,得到优化阴极,建立优化阴极的交叉孔相贯处过渡圆弧的加工过程模型,并进行优化阴极电解加工去除交叉孔相贯处锐边和毛刺的工艺试验,对比分析试验和仿真得到的过渡圆弧半径。[结果]优化阴极电解加工去除了交叉孔相贯处的锐边和毛刺,精确控制过渡圆弧平均半径(R)为2.029 mm,达到R=(2±0.2)mm的尺寸要求。建立的电解加工过程模型可以准确预测过渡圆弧的尺寸,减少试验工作量,指导了阴极的结构设计和工艺试验的参数选择。[结论]最终得到的优化阴极可以精确控制电解加工交叉孔相贯处过渡圆弧半径达到R=(2±0.2)mm。