• Title, Summary, Keyword: Sliding wear

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A Study on the Sliding Wear Rate Calculation in Spur Gears (Spur Gear의 미끄럼 마멸률에 관한 연구)

  • 김태완;문석만;구영필;조용주
    • Tribology and Lubricants
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    • v.16 no.5
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    • pp.357-364
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    • 2000
  • In this study, the sliding wear in spur gears, using Archard's wear model, is analyzed. Formulas of tooth sliding wear depth along the line of action are derived. The tooth profile is modified Id make a smooth transmission of the normal loads and the cylinder profile for reducing the pressure spike is suggested. The sliding wear rate is calculated with these profiling results. We expect these modification methods to contribute to the reduction of sliding wear not only in the root, but the tip of tooth and tooth edge.

Effect of Sliding Speed on Wear Characteristics of Polyurethane Seal (미끄럼 속도 변화에 따른 폴리우레탄 씰의 마모 특성)

  • Kim, Hansol;Jeon, Hong Gyu;Chung, Koo-Hyun
    • Tribology and Lubricants
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    • v.34 no.2
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    • pp.49-54
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    • 2018
  • 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.

Reciprocating sliding wear behavior of plastics against steel (플라스틱재료의 왕복동마찰마멸거동)

  • 김충현;안효석;정태형
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • pp.35-41
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    • 1999
  • Friction and wear test was performed for nylon, acetal resin, and PTFE(polytetrafluoroethylene) under reciprocating dry sliding conditions against a steel counterpart. Friction coefficient and specific wear rate were analysed as a function of sliding distance and applied load. The worn surfaces of plate and disc specimens were observed using SEM(Scanning Electron Microscopy). The experimental results show that acetal resin exhibited lowest wear rates whereas PTFE possessed lowest friction coefficient. The prominent wear mechanisms found were adhesion and abrasion.

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Reciprocating Sliding Wear of Nylon and Polyacetal Against Steel (나일론과 폴리아세탈의 왕복동 마찰마멸특성에 관한 고찰)

  • Kim, Chung-Hyeon;An, Hyo-Seok;Jeong, Tae-Hyeong
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.24 no.3
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    • pp.786-793
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    • 2000
  • Nylon, Polyacetal and PTFE were studied to gain a better understanding of their tribological behavior. Wear tests were conducted with reciprocating motion under dry sliding conditions. Friction coefficient and specific wear rate were measured as a function of sliding distance. The worn surfaces were examined with a Scanning Electron Microscope(SEM). Polyacetal showed lowest specific wear rates and PTFE exhibited lowest friction coefficient. The dominant wear mechanism found were adhesion and abrasion.

Friction-Wear Properties of Carburized SNCM (침탄처리한 Ni-Cr-Mo강의 마찰-마모특성)

  • Baek, Seung Ho
    • Journal of the Korean Society for Heat Treatment
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    • v.11 no.3
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    • pp.159-167
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    • 1998
  • In this study, friction-wear test was carried out on the carburized layer depth of a mechanical structure steel SNCM carburized with RX and LPG for 7hrs at $930^{\circ}C$ and also the wear properties of wear loss, wear rate, coefficient of friction, friction force and friction temperature were investigated. The wear properties for carburized layer of SNCM were tested on dry condition at the room temperature by the thrust load of 49~245N range at sliding speed of 0.2m/sec and the sliding speed of 0.2~1.0m/sec range at thrust load of 98N. Wear loss on the depth of carburizing layer was increased with increasing of thrust load and sliding speed, and with decreasing of hardness. The condition of worn surfaces were showed mild wear at less than the thrust load of 98N and sliding speed of 0.6m/sec but were showed severe wear at more than 98N and 0.6m/sec. The friction load and temperature were increased with increasing of thrust load but with increasing sliding speed was appeared minimum at 0.6m/sec. With increasing thrust load the wear rate was increased and the coefficient of friction was decreased, but with increasing sliding speed the wear rate and the coefficient of friction were decreased in 0.2~0.6m/sec and increased in 0.6~1.0m/sec, therefore 0.6m/sec in this testing is a transition velocity.

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Sliding Wear Mechanism of the High-Nitrogen Austenitic 18Cr-l8Mn-2Mo-0.9N Steel (고질소 Fe-l8Cr-l8Mn-2Mo-0.9N 강의 미끄럼 마멸 기구)

  • Kim, S.D.;Kim, S.J.;Kim, Y.S.
    • Transactions of Materials Processing
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    • v.15 no.2
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    • pp.112-117
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    • 2006
  • Sliding wear mechanism of a high nitrogen austenitic 18Cr-18Mn-2Mo-0.9N steel has been investigated. Dry sliding wear tests of the steel were carried out at various loads of IN-10N under a constant sliding speed condition of 0.15m/s against AISI 52100 bearing steel balls. Solution ($1050^{\circ}C$) and isothermal aging ($900^{\circ}C$) heat treatments were performed on the steel and the effect of the heat treatments on the wear was investigated. Wear rates of the solution-treated steel specimen remained low until 5N load, and then increased abruptly at loads above 5N. The rates of isothermally aged specimens were low and increased gradually with the applied load. Worn surfaces, their cross sections, and wear debris of the steel specimens were examined with a scanning electron microscopy. Phases of the heat-treated specimen and the wear debris were identified using XRD. The transformed phase underneath a sliding track was investigated and analyzed using a TEM. Effects of the phase transformation during the wear and $Cr_{2}N$ precipitates formed during the isothermal aging on the wear of the austenitic steel were discussed.

The Sliding Wear Behavior of Inconel 600 Mated with SUS 304 (SUS 304에 대한 Inconel 600의 Sliding 마모거동)

  • Kim, Hun;Choi, Jong-Hyun;Kim, Jun-Ki;Park, Ki-Sung;Kim, Seung-Tae;Kim, Seon-Jin
    • Korean Journal of Materials Research
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    • v.11 no.10
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    • pp.841-845
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    • 2001
  • The steam generator tubes of power plant damaged by sliding wear due to flow-induced motion of foreign object. Amount of wear have been predicted by Achard's wear equation until now. However, there are large error and low reliability, because this equation regards wear coefficient(k) as constant. The sliding wears tests have been performed at room temperature to examine parameters of wear (wear distance, contact stress). The steam generator tube material for wear test is used Inconel 600 and foreign object material is used 304 austenite stainless steel. The sliding wear tests show that the amount of wear is not linearly proportional to the wear distance(for 374 austenite stainless steel). According to experimental result, wear coefficient is not constant k but function k(s) of wear distance. The newly modified wear predictive equation V=k(s)F have small error and high reliability.

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Friction and Wear of the Vane/Roller Surfaces Depending on Several Sliding Condition for Rotary Compressor (여러 미끄럼 조건에 따른 로터리 압축기 베인/롤러 표면의 마찰 마멸 특성)

  • Lee, Young-Ze;Oh, Se-Doo;Kim, Jong-Woo;Kim, Cheol-Woo;Choi, Jin-Kyu;Cho, Sung-Ook
    • 유체기계공업학회:학술대회논문집
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    • pp.221-226
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    • 2002
  • One of the serious challenges in developing rotary compressor with HFC refrigerant is the prediction of scuffing times and wear amounts between vane and roller surfaces. In this study, the tribological characteristics of sliding surfaces using vane-roller geometry of rotary compressor were investigated. The sliding tests were carried out under various sliding speeds, normal loads and surface roughness. During the test friction force, wear depth, time to failure and surface temperature were monitored. Because severe wear was occurred on vane surface, TiN coating was applied on sliding surfaces to prolong the wear-life of vane-roller interfaces. From the sliding test it was found that there was the optimum initial surface roughness to break in and to prolong the wear life of sliding surfaces. Depending on the load and speed, the protective layers, which were composed of metallic oxide and organic compound, were formed on sliding surfaces. Those would play an important role in role amounts of friction and wear between miler and vane surfaces.

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Scuffing and Wear of the Vane/Roller Surfaces for Rotary Compressor Depending on Several Sliding Condition

  • Lee, Y.Z.;Oh, S.D.;Kim, J.W.;Kim, C.W.;Choi, J.K.;Lee, I.J.
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • pp.227-228
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    • 2002
  • One of the serious challenges in developing rotary compressor with HFC refrigerant is the prediction of scuffing times and wear amounts between vane and roller surface. In this study, the tribological characteristics of sliding surfaces using roller-vane geometry of rotary compressor were investigated. The sliding tests were carried out under various sliding speeds, normal loads and surface roughness. During the tests, friction force, wear scar width, time to failure, surface temperature, and surface roughness were monitored. Because severe wear was occurred on vane surface, TiN coating was applied on sliding surfaces to prolong the wear-life of vane-roller interfaces. From the sliding tests, it was found that there was the optimum initial surface roughness to break in and to prolong the wear life of sliding surfaces. Depending on load and speed, the protective layers, which were composed of metallic oxide and organic compound, were formed on sliding surfaces. Those would play an important role in the amount of friction and wear between roller and vane surfaces.

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Friction and Wear of the Vane/Roller Surfaces Depending on Several Sliding Condition for Rotary Compressor (미끄럼 조건에 따른 로터리 압축기 베인/롤러 표면의 마찰 마멸 특성)

  • Oh Se-Doo;Cho Sung-Oug;Lee Young-Ze
    • Tribology and Lubricants
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    • v.20 no.6
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    • pp.337-342
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    • 2004
  • One of the serious challenges in developing rotary compressor with HFC refrigerant is the prediction of scuffing times and wear amounts between vane and roller surfaces. In this study, the tribological characteristics of sliding surfaces using vane-roller geometry of rotary compressor were investigated. The sliding tests were carried out under various sliding speeds, normal loads and surface roughness. During the test, friction force, wear depth, time to failure and surface temperature were monitored. Because severe wear occurred on vane surface, TiN coating was applied on sliding surfaces to prolong the wear life of vane-roller interfaces. From the sliding test it was found that there was the optimum initial surface roughness to break in and to prolong the wear life of sliding surfaces. Depending on the load and speed, the protective layers, which were composed of metallic oxide and organic compound, were formed on sliding surfaces. Those would play an important role in the amounts of friction and wear between roller and vane surfaces.