Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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A Study on the Durability Design of a Hydraulic Cylinder for an Excavator

굴삭기 유압실린더의 내구설계 기법에 관한 연구

  • Kim, Young-Bum (Mechanical Design Research Deparment, Hyundai Heavy Industries) ;
  • Kim, Pan-Young (Mechanical Design Research Deparment, Hyundai Heavy Industries) ;
  • Kim, In-Kyu (Construction Equipment Advanced Technical Department, Hyundai Heavy Industries) ;
  • Kwon, Hak-Soon (Construction Equipment Advanced Technical Department, Hyundai Heavy Industries) ;
  • Lee, Min-Hee (Construction Equipment Advanced Technical Department, Hyundai Heavy Industries) ;
  • Park, Jin-Soo (Mechanical Design Research Deparment, Hyundai Heavy Industries)
  • 김영범 (현대중공업 기계설계연구실) ;
  • 김판영 (현대중공업 기계설계연구실) ;
  • 김인규 (현대중공업 건설장비 선행개발부) ;
  • 권학순 (현대중공업 건설장비 선행개발부) ;
  • 이민희 (현대중공업 건설장비 선행개발부) ;
  • 박진수 (현대중공업 기계설계연구실)
  • Received : 2010.05.14
  • Accepted : 2010.09.17
  • Published : 2010.12.01
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Abstract

A hydraulic cylinder is a primary component of an excavator and is used for activating attachments such as boom, arm, and bucket. Generally, the cylinder is prone to structural problems such as buckling and fatigue failure caused by cyclic high pressure. Therefore, the safety margin for fatigue, yield, and buckling during the design lifetime should be evaluated at the durability-design stage. The durability design includes basic and detailed stages. In the basic design, the principal dimensions of the rod and tube are determined by considering the working force, speed, and range with respect to yield and buckling. In the detailed design, the dimensions of the rod notch, welds, tube end, gland, orifice, and cushion ring are determined by considering the fatigue safety. We present and discuss the overall procedure for durability design and the related analysis techniques.

굴삭기 유압실린더는 붐, 암, 버킷과 같은 작업장치를 작동시키는 핵심 부품이다. 일반적으로 유압실린더는 반복적인 고압으로 인해 좌굴이나 피로 파손과 같은 구조적 문제가 종종 발생한다. 따라서, 유압실린더의 내구설계 시 설계수명 동안의 피로, 항복, 좌굴 등에 대한 구조 안전도 평가가 반드시 이루어져야 한다. 내구설계는 기본설계와 상세설계 두 단계로 구성되는데, 기본설계 단계에서는 굴삭기의 작업능력, 작업속도, 작업영역 등을 고려하여 항복과 좌굴 안전도를 만족하도록 로드와 튜브의 주요 치수를 결정한다. 상세설계 단계에서는 로드 노치, 용접부, 튜브 끝단, 글랜드, 오리피스, 쿠션링 등의 상세치수를 주로 피로 안전도 측면에서 결정한다. 본 연구에서는 이러한 내구설계의 전반적인 절차와 각 설계 단계에서 내구설계 평가를 위한 해석기법에 대해 기술하였다.

Keywords

References

  1. ISO Technical Committee 127, 1993, ISO 10567: Earth-Moving Machinery-Hydraulic Excavators-Lift Capacity, International Organization for Standardization, Switzerland, pp. 1-10.
  2. ISO Technical Committee 127, 2006, ISO 6015: Earth-Moving Machinery-Hydraulic Excavators and Backhoe Loaders-Methods of Determining Tool Forces, International Organization for Standardization, Switzerland, pp. 12-16.
  3. Ugural, A. C., 2003, Mechanical Design: An Integrated Approach, McGraw-Hill, New York, pp. 661-666.
  4. Stephens, R. I., Fatemi, A., Stephens, R. R. and Fuchs, H. O., 2001, Metal Fatigue in Engineering, John Wiley & Sons, Inc., Canada, pp. 196-206.
  5. Bannantine, J. A., Comer, J. J. and Handrock, J. L., 1997, Fundamentals of Metal Fatigue Analysis, Prentice Hall, New Jersey, pp. 137-148.
  6. Hobbacher, A., 2005, Recommendations for Fatigue Design of Welded Joints and Components, International Institute of Welding, Paris, pp. 21-79.
  7. Fricke, H., 2006, Round-Robin Study on Stress Analysis for the Effective Notch Stress Approach, International Institute of Welding, Paris, pp. 1-17.

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