• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>International Journal of Electrochemical Science >Research on the Theoretical Model of Combined Micro- Machining of Laser and Electrolysis of Thermal Barrier Coated Turbine Blade Film Cooling Holes
【24h】

Research on the Theoretical Model of Combined Micro- Machining of Laser and Electrolysis of Thermal Barrier Coated Turbine Blade Film Cooling Holes

机译：热障涂层涡轮叶片薄膜冷却孔激光与电解联合微加工理论模型的研究

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In view of high quality machining demand of thermal barrier coated turbine blade film cooling holes, anew method of combined micro-machining of laser and electrolysis is presented in this thesis. First ofall, in electrolyte fluid, micro-holes on thermal barrier coatings are milled by photochemical etching ofultraviolet laser. Moreover, micro-holes on nickel-based alloy blade are etched by high frequencypulsed electrochemical machining. It can manufacture film cooling holes by cold machining. No recastlayer and micro-cracks are produced, so machining quality is improved. Meanwhile, the problem thatconventional methods of electric machining such as electrochemical machining and electricaldischarge machining cann etch non-conductive coatings is solved. Machining errors are reducedbecause only one single presetting cutter is needed from hole machining to its final shape. Methodslike small clearance machining, side wall insulating tubular electrode and low concentration acidicelectrolyte are applied in electrochemical machining to improve machining precision. This thesisanalyzes photochemical etching conditions of micro-holes on thermal barrier coatings with ultravioletlaser, process of development and collapse of cavitation bubbles and their functions in laser machining.It puts forward mechanism of high frequency pulsed electrochemical machining of micro-holes onnickel-based alloy blade. And then, mechanism of combined micro-machining is researched. Heatconduction process in macroscopic materials of thermal barrier coatings and potential distribution inmachining gap are analyzed by Fourier's law and Laplace Equation respectively. Cooling effects ofelectrolyte fluid in laser machining and influences of uneven distribution of electrolyte conductivity inelectrochemical machining are considered. Theoretical model of combined micro-machining isestablished, the validity of which is proved by experiment.
机译：鉴于对热障涂层涡轮叶片薄膜冷却孔的高质量加工需求，本文提出了一种激光与电解微加工相结合的新方法。首先，在电解液中，通过紫外线激光的光化学刻蚀在热障涂层上铣削微孔。而且，镍基合金叶片上的微孔通过高频脉冲电化学加工而被蚀刻。它可以通过冷加工制造薄膜冷却孔。没有重铸层和微裂纹的产生，因此提高了加工质量。同时，解决了电化学加工，电火花加工等常规的电加工方法不能腐蚀非导电涂层的问题。由于从孔加工到最终形状只需要一个预置刀，因此可以减少加工误差。电化学加工中采用了小间隙加工，侧壁绝缘管状电极和低浓度酸性电解质等方法，以提高加工精度。本文分析了紫外激光在热障涂层上微孔的光化学刻蚀条件，空化气泡的产生和破裂过程及其在激光加工中的功能。提出了镍基合金叶片微孔高频脉冲电化学加工的机理。 。然后，研究了组合微加工的机理。通过傅立叶定律和拉普拉斯方程分别分析了热障涂层宏观材料中的热传导过程和加工间隙的电位分布。考虑了激光加工中电解液的冷却效果以及电化学加工中电解质电导率分布不均的影响。建立了组合式微加工的理论模型，通过实验证明了其有效性。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号