대형마찰용접을 이용한 로타샤프트 제조공정개발

Process Development of Rotor Shaft using a Large Friction Welding

  • 정호승 (부산대학교 기계기술연구소) ;
  • 조종래 (한국해양대학교 기계정보공학부) ;
  • 이낙규 (한국생산기술연구원 디지털성형공정팀) ;
  • 박희천 ((주)케이에스피 기술연구소) ;
  • 최성규 ((주)케이에스피 기술연구소)
  • 발행 : 2007.05.10

초록

Inertia welding is a solid-state welding process in which butt welds in materials are made in bar and in ring form at the joint face, and energy required for welding is obtained from a rotating flywheel. The stored energy is converted to frictional heat at the interface under axial load. The quality of the welded joint depends on many parameters, including axial force, initial revolution speed and energy, amount of upset, working time, and residual stresses in the joint. Inertia welding was conducted to make the large rotor shaft for low speed marine diesel engine, alloy steel for shaft of 140mm. Due to different material characteristics, such as, thermal conductivity and flow stress, on the two sides of the weld interface, modeling is crucial in determining the optimal weld geometry and parameters. FE simulation was performed by the commercial code DEFORM-2D. A good agreement between the predicted and actual welded shape is observed. It is expected that modeling will significantly reduce the number of experimental trials needed to determine the weld parameters.

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