MANUFACTURING OF SHAPED HOLES IN MULTI-LAYER PLATES BY LASER DRILLING
Providing the technology to achieve an efficiency of 65％ in natural gas-fired combined cycle power plants is the aim of the Collaborative Research Center 561 “Thermally highly loaded, porous and cooled multilayer systems for combined-cycle power plants at RWTH Aachen University, Germany. For these purposes, the fluid temperatures in the gas turbine cycle have to be raised considerably. This requires a more effective cooling of the thermo-mechanically highly-loaded parts, which is achieved by a newly developed effusion cooling. Within this paper drilling of cooling holes at an acute angle and generating the fan shape at the hole outlet by pulsed laser radiation is discussed as a new manufacturing technique. The drilling techniques used are percussion drilling for the through holes and fiveaxis trepanning for the fan shapes. The influence of the process gases argon and oxygen with different gas pressures on the drilling are investigated. By using superposed laser radiation a significant decrease of drilling time and of standard deviation of the drilling time is achieved resulting in a reduced over all machining time.
laser drilling superposed laser radiation aspect ratio process monitoring shaped holes
K. Walther M. Brajdic J. Dietrich M. Hermans M. Witty A. Horn I. Kelbassa R. Poprawe
Lehrstuhl fuer Lasertechnik, RWTH Aachen Lehrstuhl fuer Lasertechnik, RWTH Aachen Fraunhofer Institut fuer Lasertechnik Steinbachstrasse 15,
国际会议
第三届太平洋国际激光与光学应用会议(PICALO 2008)
北京
英文
789-794
2008-04-16（万方平台首次上网日期，不代表论文的发表时间）