中国机械工程 ›› 2010, Vol. 21 ›› Issue (17): 2034-2037.

• 机械基础工程 • 上一篇    下一篇

数控电解精修整体叶轮叶片型面过切问题研究

吴建民1;徐家文2
  

  1. 1.上海工程技术大学,上海,201620
    2.南京航空航天大学,南京,210016
  • 出版日期:2010-09-10 发布日期:2010-09-20
  • 基金资助:
    十一五国防预研项目
    National Defense Pre-research Foundation of General Armament Department

Study on Overcuts of NC-Electrochemical Finish Machining for Integral Impeller Blades

Wu Jianmin1;Xu Jiawen2
  

  1. 1.Shanghai University of Engineering Science, Shanghai, 201620
    2.Nanjing University of Aeronautics and Astronautics, Nanjing,210016
  • Online:2010-09-10 Published:2010-09-20
  • Supported by:
    National Defense Pre-research Foundation of General Armament Department

摘要:

针对直线刃简单阴极电解精修直纹面整体叶轮扭曲叶片时的过切问题,提出利用调整阴极运动轨迹的方法予以解决。利用给定数据点对叶片直纹型面进行拟合,通过对叶片型面进行离散推导出编制数控加工程序要求的各轴运动量计算公式。分析了扭曲叶片的几何特性,对利用具有一定宽度的直线刃阴极加工叶片型面时相邻区域产生过切的问题进行了分析,对过切量进行了计算,推导出了初始加工运动轨迹的修正方案,最终加工出满足要求的整体叶轮叶片。
 

关键词:

Abstract:

The overcut was caused by the twisted blades while integral impeller with ruled-surface blades were electrochemically finish machined using linear edged simple cathode. To solve this problem, a method-to adjust moving path of the cathode-was put forward. With this aim, firstly the fitting surface of ruled-surface blade with given data was discussed. Then the equation of movement displacement of four axis was deduced in order to design the numerical control (NC) machining program after the surface of blade was discretized. Moreover, through studying geometric characteristics of the blade surface, one cause of overcut was analysed - when blade with twisted ruled-surface was machined by the cathode with certain width. So moving path of the cathode was redesigned according to the amount of the overcut. Finally the integral impeller blades meeting the requirements were electrochemically machined.

 

Key words: NC electrochemical machining, integral impeller, overcut, moving path, NC programming

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