한국정밀공학회지 (Journal of the Korean Society for Precision Engineering)

  • 제31권7호
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  • Pages.627-634
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  • 2014
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  • 1225-9071(pISSN)
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  • 2287-8769(eISSN)
한국정밀공학회 (Korean Society for Precision Engineering)
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랜덤가진시험을 이용한 대형 크랭크샤프트 가공용 복합다기능 선반의 강성 평가

Stiffness Evaluation of a Heavy-Duty Multi-Tasking Lathe for Large Size Crankshaft Using Random Excitation Test

  • 최영휴 (창원대학교 기계공학부) ;
  • 하경보 (창원대학교 대학원 기계설계공학과) ;
  • 안호상 (한국정밀기계(주) 기술연구소)
  • 투고 : 2014.04.10
  • 심사 : 2014.05.20
  • 발행 : 2014.07.01
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초록

Machine tool vibration is well known for reducing machining accuracy. Because vibration response of a linear structure generally depends on its transfer function if the magnitude of excitation were kept constant, this study introduces a RET(Random Excitation Test) based on FRF method to evaluate stiffness of a prototype HDMTL(Heavy-Duty Multi-Tasking Lathe) for large crankshaft of marine engine. Firstly, two force loops of the lathe and corresponding structural loops were identified:1) workpiece - spindle - head stock - main bed, 2) workpiece - tool post - carriage bed. Secondly, compliances of each structural loop were measured respectively using RET with a hydraulic exciter and then converted into stiffness. Finally, the measured stiffness was compared with that obtained previously by FEM analysis. As the result, both measured and computed stiffness were closely in agreement with each other. And the prototype HDMTL has evidently sufficient rigidity above ordinary heavy-duty lathes.

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참고문헌

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