Tribology and Lubricants

Korean Tribology Society (한국트라이볼로지학회)
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Effect of Sliding Speed on Wear Characteristics of Polyurethane Seal

미끄럼 속도 변화에 따른 폴리우레탄 씰의 마모 특성

  • Kim, Hansol (School of Mechanical Engineering, University of Ulsan) ;
  • Jeon, Hong Gyu (Reliability Assessment Department, Hyundai Construction Equipment) ;
  • Chung, Koo-Hyun (School of Mechanical Engineering, University of Ulsan)
  • 김한솔 (울산대학교 기계공학부) ;
  • 전홍규 (현대건설기계 신뢰성평가부) ;
  • 정구현 (울산대학교 기계공학부)
  • Received : 2018.01.22
  • Accepted : 2018.03.24
  • Published : 2018.04.30
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Abstract

Hydraulic reciprocating seal has been widely used to prevent fluid leakage in hydraulic systems. Also, hydraulic reciprocating seal plays a significant role to provide lubricant film at contacting interface to minimize tribological problems due to sliding with counter material. To predict lifetime of hydraulic reciprocating seal, quantitative understanding of wear characteristics with respect to operating conditions such as normal force and sliding speed is needed. In this work, effect of sliding speed on wear of polyurethane (PU) hydraulic reciprocating seal were experimentally investigated using a pin-on-disk tribo-tester. The wear characteristics of PU specimens were quantitatively determined by comparing the confocal microscope data before and after test. It was found that the wear rate of PU specimens decreased from $4.9{\times}10^{-11}mm^3$ to $1.1{\times}10^{-11}mm^3/Nm$ as sliding speed increased from 120 mm/s to 940 mm/s. Also, it was observed that the friction decreased slightly as the sliding speed increased. Improvement of lubrication state with increasing sliding speed was likely to be responsible for this enhanced friction and wear characteristics. This result also suggests that decrease in sliding distance between PU elastomer and counter materials at lower sliding speed is preferred. Furthermore, the quantitative assessment of wear characteristics of PU specimen may be useful in prediction of lifetime of PU hydraulic reciprocating seal if the allowed degree of wear for failure of the seal is provided.

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References

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