• 제목/요약/키워드: pin-on-disk

검색결과 247건 처리시간 0.028초

TiB2 분말로 강화된 Cu-TiB2 복합재료의 내마모특성 (The Characteristics of Wear Resistance of Cu-TiB2 Composites Reinforced by TiB2 Powders)

  • 이태우;최종운;강계명
    • 한국재료학회지
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    • 제15권12호
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    • pp.824-828
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    • 2005
  • In this study the effect of the content of $TiB_2$ on wear properties was investigated. $Cu-TiB_2$ composites have been fabricated by hot extrusion. Sliding wear tests were peformed by a pin-on-disk type wear test machine under dry condition and loads varied with from 20N to 80N at sliding speed 3.5Hz. The test results showed that the wear losses and the friction coefficients decreased with increasing $Cu-TiB_2$ volume fraction and increasing the size of $Cu-TiB_2$ particle. Wear property of $10{\mu}m,\;5 vol\%\; TiB_2$ specimen was excellent all of the wear specimens. It is thought that the increase of plastic flow resistivity due to uniform distribution of $10{\mu}m,\;5 vol\%\; TiB_2$ wear specimen would improve wear property. The worn surface and wear debris were examined by optical microscope and scanning electron microscope.

크레인용 시브 강재의 마멸특성 평가 (The Evaluation on Wear Characteristics of the Crane Sheave)

  • 박용재;류중북;김석삼
    • 한국윤활학회:학술대회논문집
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    • 한국윤활학회 2004년도 학술대회지
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    • pp.306-311
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    • 2004
  • The sliding wear characteristics of the crane sheave were investigated using a pin-on-disk rig tester The experiment was conducted using a high carbon steel wire that was upper material, also carbon steel castings and carbon steel for machine structural use that was disk material. There are various operating conditions in this work. At the room temperature, we carried out the wear test under a grease lubrication. The results of wear test showed that carbon steel for machine structural use have lower wear volume, also the wear curves are linearly increased with increasing of sliding velocity The wear mechanism of a disk is the abrasive, adhesion, and fatigue wear under lubrication.

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재질 별 마찰곡선을 반영한 마찰소음 유한요소 해석 연구 (Finite Element Analysis for Friction Noise with Respect to the Friction Curve of Several Materials)

  • 백종수;남재현;도현철;강재영
    • 대한기계학회논문집A
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    • 제40권5호
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    • pp.449-455
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    • 2016
  • 본 연구는 마찰 특성이 다른 재질 별로 마찰에 의한 소음을 해석하는 스퀼 유한요소 해석 방법론을 제안하고 이를 실험 검증하고자 하였다. 회전운동 실험 장치를 통하여 각 재질 별 마찰곡선을 확인하였으며, 왕복운동 시험 장치에서 재질 별 마찰 소음을 계측하였다. 계측 된 마찰곡선을 특정 속도에서 선형화하여 마찰곡선 기울기 데이터를 FE Model에 적용하였다. 제안 된 해석 모델에서 발현 된 불안정 모드가 시험에서 발생한 스퀼 주파수와 유사함을 보였다.

WC/C 박막 코팅의 환경변화에 따른 트라이볼로지적 특성 (Tribological characteristics of WC/C multilayer films with various environments)

  • 이은성;김석삼;김종국
    • 한국윤활학회:학술대회논문집
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    • 한국윤활학회 2001년도 제34회 추계학술대회 개최
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    • pp.78-87
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    • 2001
  • The friction and wear behaviors of WC/C multilayer coating were investigated by using a pin on disk type tester. The experiment was conducted by using silicon nitride (S $i_{3}$ $N_{4}$) as a pin material and WC/C multilayer coating on bearing steel (STB2) as a disk material, under various environments that are atmospheric conditions of high vacuum( 1,3$\times$10$^{-4}$ Pa), medium vacuum( 1.3$\times$10$^{-l}$Pa). ambient air( 10$^{5}$ pa)(3 types) and relative humidity(2~98%) conditions. The results showed that WC/C coating fracture was suddenly increased with increasing degree of vacuum, because of high adhesion. So, WC/C coating could not be displayed their ability as solid lubricant. WC/C coating could be displayed better abilitv as solid lubricant with increasing relative humidity. because of oxide film, size and shape of wear debris. The friction coefficient and specific wear rate became better about RH 50%.%.

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Ductile Cast Iron (DCI) 롤의 마모 특성 고찰 및 마모계수 도출을 위한 실험적 연구 (Experimental Study to Examine Wear Characteristics and Determine the Wear Coefficient of Ductile Cast Iron (DCI) Roll)

  • 변상민
    • Tribology and Lubricants
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    • 제33권3호
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    • pp.98-105
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    • 2017
  • A pin-on-disk test is performed to measure the wear volume of a ductile cast iron (DCI) roll when it wears down using a high carbon steel and two alloy steels at different sliding velocities between the roll and the material (steel). Normal pressure is set as constant and test temperatures are 400, 500 and $600^{\circ}C$. In addition, thermal softening behavior of the DCI roll is examined using a high-temperature micro-hardness tester and the surface hardness variation of the DCI roll is expressed in terms of temperature and heating time. Based on experimental data, a wear coefficient used in Archard's wear model for each material is obtained. The wear volume is clearly observed when the test temperature is $400^{\circ}C$ and sliding velocity varies. However, it is not measured at temperatures of $500^{\circ}C$ and $600^{\circ}C$ even with variations in sliding velocity. From the optical photographs of the pin and disk, the abrasive wear is observed at $400^{\circ}C$ clearly, but no at $500^{\circ}C$ and $600^{\circ}C$. At higher temperatures, the pin surface is not smooth and has many tiny caves distributed on it. It is found that wear volume is dependent on the carbon contents rather than alloy contents. Results also reveal that the variations of wear coefficients are almost linearly proportional to the carbon contents of the material.

가교된 초고분자량 폴리에틸렌의 내마모성 (Wear Resistance of Crosslinked Ultra-high Molecular Weight Polyethylene)

  • 임채익;이귀종;조재영;최재봉;최귀원
    • 대한의용생체공학회:의공학회지
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    • 제20권1호
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    • pp.99-106
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    • 1999
  • 인공관절용 재료의 내마모성 향상을 목적으로 초고분자량 폴리에틸렌(UHMWPE)을 가교시켜 기계적 성질과 내마모성을 조사하였다. 가교제로 dicumyl peroxide(DCP)를 사용하고 가교보조제로 triallyl cyanurate(TAC)를 사용하여 용융상태에서 UHMWPE를 가교시켰다. DCP와 TAC의 함량이 증가할수록 가교된 초고분자량 폴리에틸렌(XUMPE)의 젤 함량은 증가하고 녹는점, 결정화온도, 결정화도, 인장성질은 감소하였다. Pin-on-disk 마모시험과 작은 하중을 가한 ball-on-disk 마모시험에서는 기계적 성질의 감소에도 불구하고 XUMPE의 마모부피가 UHMWPE보다 감소하였다. 이 두 시험에서의 마모는 주로 변형에 의한 것으로 판단되었으며, 마모부피는 Hertz 접촉 이론으로 계산한 최대접촉응력과 XUMPE의 항복강도의 비에 비례함을 보였다. 큰 하중을 가한 ball-on-disk 마모시험에서는 기계적 성질이 낮을수록 더 큰 마모부피를 보였으며, 마모자국의 표면거칠기와 마찰계수도 증가하였다. 이는 인장강도를 넘는 응력이 가해졌을 때 항복강도와 인장강도가 더 낮은 XUMPEDml 변형과 파괴가 촉진되기 때문으로 생각되었다.

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탄소주강품과 경강선재간의 미끄럼 마멸특성 (The Sliding Wear Characteristics of the Carbon Steel Castings against High Carbon Steel Wire Rods)

  • 류중북;채영훈;김석삼
    • Tribology and Lubricants
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    • 제19권4호
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    • pp.223-229
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    • 2003
  • The sliding wear characteristics of the crane sheave were investigated using a pin-on-disk rig tester. The experiment was conducted using a high carbon steel wire that was upper material, also carbon steel castings that was disk material. There are various operating conditions in this work. At the room temperature, we carried out the wear test under a grease lubrication and dry condition. The results of wear test showed that an annealed-casted have lower, also the wear curves are linearly increased with increasing of sliding distance. For the specific wear rate of annealed-casted, the wear resistance was increased with decreasing diameter of wire. The wear of a wire and a disk have a different mechanism, the one is the abrasive wear due to fatigue wear under lubrication, another is the adhesion wear under dry condition.

크레인시브와 로프소선간의 미끄럼 마멸특성에 관한 기초연구 (A Fundamental Study for the Sliding Wear Characteristics of the Crane Sheave Against a Rope Wire)

  • 류중북;채영훈;김석삼
    • 대한기계학회논문집A
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    • 제27권11호
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    • pp.1873-1880
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    • 2003
  • The sliding wear characteristics of the crane sheave were investigated using a pin on disk rig tester. The experiment was conducted using a high carbon steel wire that was upper material, also carbon steel castings that was disk material. There are various operating conditions in this work. At the room temperature, we carried out the wear test under a grease lubrication and dry condition. The results of wear test showed that an annealed-casted have lower, also the wear curves are linearly increased with increasing of sliding distance. For the specific wear rate of annealed-casted, the wear resistance was increased with decreasing diameter of wire. The wear of a wire and a disk have a different mechanism, the one is the abrasive wear due to fatigue wear under lubrication, another is the adhesion wear under dry condition.

Tribological Characteristics of Magnetron Sputtered MoS$_2$ films in Various Atmospheric Conditions

  • Kim, Seock-Sam;Ahn, Chan-Wook;Kim, Tae-Hyung
    • Journal of Mechanical Science and Technology
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    • 제16권9호
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    • pp.1065-1071
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    • 2002
  • The friction and wear behaviors of magnetron sputtered MoS$_2$ films were investigated through the use of a pin and disk type tester. The experiments were performed for two kinds of specimens (ground (Ra 0.5 $\mu\textrm{m}$) and polished (Ra 0.01 $\mu\textrm{m}$) substrates) under the following operating condifions : linear sliding velocities in the range of 22~66 mm/s (3 types), normal loads varying from 9.8~29.4 N(3 types) and atmospheric conditions of air, medium and high vacuum (3types). Silicon nitride pin was used as the lower specimen and magnetron sputtered MoS$_2$ on bearing steel disk was used as the upper specimen. The results showed that low friction property of the MoS$_2$ films could be identified in high vacuum and the specific wear rate in air was much higher than that in medium and high vacuum due to severe oxidation. It was found that the main wear mechanism in air was oxidation whereas in high vacuum accumulation of plastic flow and adhesion, were the main causes of wear.

압출된 OFHC Cu 봉재의 집합조직과 마멸거동 (The effect of texture of an extruded OFHC Cu rod on its sliding wear characteristics)

  • 이슬기;김용석;조재형
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 2009년도 추계학술대회 논문집
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    • pp.354-357
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    • 2009
  • The effect of texture of an extruded OFHC Cu rod on its sliding wear has been explored. Disk specimens with three different orientations were machined from the Cu rod for the wear test; surfaces of the disk were perpendicular ($0^{\circ}$), inclined with a specific angle ($45^{\circ}$), and parallel ($90^{\circ}$) to the extrusion axis of the rod. The texture was analyzed using an X-ray goniometer by measuring {111}, {200}, and {220} pole figures of each specimen. The analyzed texture was correlated with wear-test results of the Cu specimen. Dry sliding wear tests were performed at room temperature using a pin-on-disk wear tester against an Al2O3 ball. Applied load, sliding distance, sliding speed were fixed as 20 N, 200 m, and 0.5 m/sec, respectively. The $45^{\circ}$-inclined (to the extrusion axis) disk specimen showed the lowest wear resistance with the least data scatters. It has been found that distribution of cube texture strongly influences wear rate of the extruded Cu rod.

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