航空学报 > 2014, Vol. 35 Issue (1): 259-267   doi: 10.7527/S1000-6893.2013.0380

整体叶盘叶型电解加工流场设计及实验

刘嘉, 徐正扬, 万龙凯, 朱荻, 朱栋   

  1. 南京航空航天大学 机电学院, 江苏 南京 210016
  • 收稿日期:2013-07-20 修回日期:2013-09-06 出版日期:2014-01-25 发布日期:2013-11-04
  • 通讯作者: 徐正扬,Tel.:025-84896304 E-mail:xuzhy@nuaa.edu.cn E-mail:xuzhy@nuaa.edu.cn
  • 作者简介:刘嘉 男,博士研究生,助理研究员。主要研究方向:特种加工、电化学制造。Tel:025-84896304 E-mail:meejliu@nuaa.edu.cn;徐正扬 男,博士,副教授,硕士生导师。主要研究方向:特种加工、电化学制造。Tel:025-84896304 E-mail:xuzhy@nuaa.edu.cn
  • 基金资助:

    国家自然科学基金(51005119);江苏省自然科学基金(BK2012387)

Design and Experiment of Electrolyte Flow Mode in Electrochemical Machining of Blisk

LIU Jia, XU Zhengyang, WAN Longkai, ZHU Di, ZHU Dong   

  1. College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
  • Received:2013-07-20 Revised:2013-09-06 Online:2014-01-25 Published:2013-11-04
  • Supported by:

    National Natural Science Foundation of China (51005119); Jiangsu Province Natural Science Foundation (BK2012387)

摘要:

电解加工(ECM)是航空发动机整体叶盘制造的主要技术之一,其电解液流场稳定性是影响电解加工精度和表面质量的核心因素。本文在分析原有的二维流场基础上,针对流体在不同流道截面下的流场状态,提出了一种三维复合电解液流场模式,即三股电解液分别从毛坯进气边、叶盆叶根、叶背叶根流入,由排气边交汇流出。采用有限元法对三维复合流场及两类二维流场开展仿真分析,分析结果表明三维复合流场改善了流道突变区域流场状态,有效抑制了二维流场的流场缺陷,有助于提高流场稳定性。对加工区液体流态进行了判断,其结果显示三维复合流场可以满足电解加工要求。开展了3种流场模式的加工速度比较实验,三维复合流场达到的进给速度最高,较二维流场可显著提升加工效率。采用三维复合流场开展了多叶片扇段加工,获得了较好的重复精度与表面质量。

关键词: 电解加工, 航空发动机, 整体叶盘, 流场, 有限元仿真

Abstract:

Electrochemical machining (ECM) is an important processing technology in aerospace industry to produce blisks. The stability of the flow field is a critical factor which affects the ECM process accuracy and the surface quality of the blades. This paper analyzes the insufficient fluid of the traditional flow mode in electrochemical machining of blisks. A new electrolyte flow mode, the "3D complex flow mode", is proposed to machine blisks. There are three electrolyte inlets in this flow mode, which allow flows into the leading edge of the blade, the root of the concave blade and the root of the convex blade. The electrolyte outlet is near the exhaust edge of the blade. The flow mode is analyzed by the finite element method. The results demonstrate that flow field stability is enhanced with this flow mode. An evaluation of the flow state in the processing area indicates that this mode is able to meet the requirements of ECM. Experimental investigations are carried out in order to evaluate the feasibility of the flow mode. The results show that machining efficiency is improved significantly with this flow mode. The processing experiment for the section part of a blisk is carried out by using the 3D complex flow mode. The test specimens exhibit better processing repeatability and surface quality.

Key words: electrochemical machining, aircraft engines, blisk, flow fields, FEM simulation

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