Abstract:

In order to reasonably make use of the flow field to improve the stability and the w(3Irkpiece’s surface quality,a multi-hole tube electrode for the electrochemical machining(ECM)of blisk channels is designed. Then,the intluence of the diameter of outflow holes on che unifofruity of flow eld is elaborated on the premise tllat the adiacent holes distribute isometrically.Moreover,a mathematical model describing the flow field is established,and a flow-field numerical simulation for the flow mode iS carried out by means of the finite element method. Analytical results show that,during the stable ECM at the same electrode diameter and outflow holes number,a smaller outflow diameter within a eertain range is beneficial to the uniformity improvement of the flow field. In order to verify the reasonableness of this flow mode,some ECM experiments are finally carried out. The results indicate that a relatively small outflow diameter helps to improve the uniformity of the flow field,stabilize the ECM process and obviously reduce the lateral flowline crack of the blisk channels.

Key words: blisk, electrochemical machining, flow field, uniform ity, finite element method, numerical simulation