• Title/Summary/Keyword: 마찰면

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Development of automated manufacturing equipment paving stone (페이빙스톤 자동 제조장치를 위한 연구)

  • Oh, Seong-Hun;Kim, Ho-Keon;Kim, Jeong-Jin
    • Proceedings of the KAIS Fall Conference
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    • 2011.05b
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    • pp.974-976
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    • 2011
  • 수석을 가공하기 위해서 회전 통 안에 피연마물을 투입하고 이를 회전 시키면 피연마물 자체의 마찰과 동체와의 마찰로 연마가 된다. 본 연구는 복수의 석재가 회전드럼에 투입되고 회전드럼이 회전을 하면 회전드럼 내측 벽에 개별적으로 고정되어있는 폐비닐로 이루어져있는 패드가 복수의 석재를 회전드럼이 회전하는 방향으로 견인하여 회전드럼에 투입된 복수의 석재가 서로 충돌하여 석재의 거친 면이나 날카로운 모서리가 부드럽게 연마될 수 있도록 하고, 폐비닐로 이루어져있는 패드는 석재에 발생되는 충격을 흡수하고 기존의 패드보다 강도를 크게 향상시키고 훼손된 패드만 교체할 수 있도록 고안하였다.

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Friction Welding of Dissimilar Press Punch Materials and Its Evaluation by AE (신소재 금형펀치의 이종재 마찰용접 개발과 AE품질평가를 위한 연구)

  • 오세규;박일동;이원석
    • Journal of Welding and Joining
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    • v.15 no.2
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    • pp.43-53
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    • 1997
  • The complete joining method for dissimilar press punch materials and its real-time evaluation method is not available at present. Brazing method has been used for joining them, but it is known that the welded joint by the brazing has the lower bonding efficiency and reliability than the diffusion welding. The friction welding with a diffusion mechanism in bonding was applied in this study. This work was carried out to determine the proper friction welding conditions and to analyze mechanical properties of friction welded joints of sintered carbide tool materials (SKNM50 for the blade part of press punch) to alloy steel (SCM440 for the shank part of press punch) using aluminum (A6061 for the interlayer material) as an insert material between the sintered carbide tool materials and the alloy steel. In addition, acoustic emission test was carried out during friction welding to evaluate the weld quality.

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A Study on the Squeal Noise generated by Self-excited Vibration in Friction surface (마찰면에서 자여 진동에 의해 발생되는 스퀼 소음에 관한 연구)

  • 이해철
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 1998.10a
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    • pp.90-96
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    • 1998
  • There are various noises generated by friction. Among the rest, eliminating squeal noise generated during braking is an important task for the improvement of vehicle passengers' comfort. The parameters affecting brake squeal noise are the material properties of the braking pad, the dynamic properties of the brake parts and the dimensions of the brake assemble etc. Also, the squeal noise changes its inherent form(i.e. its sound pressure level and its frequency) with the normal load and sliding speed. In this study, the characteristics of brake squeal noise generated by friction is analyzed experimentally. The experiment focused on the analysis of friction self-excited vibrationand squeal noise level. Friction self-excited vibration is caused by the dry friction between pads and rotor, and occurs as a function of their relative sliding speeds. And Friction self-excited vibration is raised the brake squeal noise.

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Friction Welding of Sintered Hard Tool Materials to Metals and Its Quality Evaluation by AE (마찰용접에 의한 초경공구재와 금속간의 압접기술개발과 AE에 의한 품질평가)

  • 오세규;전태언;박일동;오명석;이주석
    • Journal of Ocean Engineering and Technology
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    • v.10 no.1
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    • pp.36-46
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    • 1996
  • This paper deals with determinig the proper friction welding condition and analyzing various mechanical properties of friction welded joints of sintered carbide tool materials(K20, P25, and SKDX5 for the blade part of drill or press punch) to alloy steel (SKH4, SCM440 for the shank part of drill or press punch), the alloy steel to aluminum(A6061 for the interlayer material between the blade part and the shank) and sintered carbide tool materials to alumminum. And also acoustic emission test will be carried out during fiction welding to evaluate the weld quality.

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Application of Fractal Demension for Topography Analysis of Frictional Surface of Case Hardened Steel (표면경화강의 마찰면 형상특징 해석을 위한 프렉탈 차원의 적용)

  • Cho, Yon-Sang;Ok, Chul-Ho;Park, Heung-Sik;Jun, Tae-Ok
    • Proceedings of the KSME Conference
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    • 2000.04a
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    • pp.755-759
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    • 2000
  • The determination of surface topography is believed to be extremely important in the areas of contact mechanics, adhesion and friction. In order to describe topography of various frictional surface. the wear test was carried out under different experimental conditions in dry friction. And fractal descriptors was applied to frictional surface of laser modified steel with image processing System. These descriptors to analyze surface structure are fractal dimension. Surface fractal dimension can be determined by sum of intensity difference of surface pixel. Topography of frictional surface can be effectively obtained by fractal dimensions.

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The Effects of Friction on the Contact Area and the Distribution of Contact Pressure (접촉 면적과 접촉면 압력분포에 대한 마찰의 영향)

  • 이문주;조용주
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • 1999.11a
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    • pp.193-199
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    • 1999
  • In the 3-Dimensional contact of the smooth spheres, the effects of friction on the contact area and the distribution of contact pressure was studied numerically. The contact area and pressure distribution was evaluated for the only normal load and for the case of a normal load in the presence of a tangential traction. To do this work, the technique of simple discretization using the load . displacement relationship for a uniformly distributed load of a rectangular patch was used.

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Topographical Analysis of Frictional Surface of Laser Modified Steel by Fractal Dimension (Fractal 차원에 의한 레이저 개질강의 마찰면 형상해석)

  • 오동석;조연상;옥철호;진동규;박흥식;이광영
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • 1999.11a
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    • pp.240-246
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    • 1999
  • The determination of surface topography is believed to be extremely important in the areas of contact mechanics, adhesion and friction. In order to describe topography of various frictional surface, the wear test was carried out under different experimental conditions in dry friction. And fractal descriptors was applied to frictional surface of laser modified steel with image processing system. These descriptors to analyze surface structure are fractal dimension. Surface fractal dimension can be determined by sum of intensity difference of surface pixel. Topography of frictional surface can be effectively obtained by fractal dimensions.

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An Experimental Study on the Squeal Noise Generated in Friction Surface of Disk Brake (디스크 브레이크의 마찰면에서 발생되는 스퀼소음에 관한 실험적 연구)

  • 이해철;이원평;차경옥
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2000.10a
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    • pp.26-31
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    • 2000
  • There are various noises generated by friction. Among the rest, eliminating squeal noise generated during braking is an important task for the improvement of vehicle passengers' comfort. The parameters affecting brake squeal noise are the material properties of the braking pad, the dynamic properties of the brake parts and the dimensions of the brake assembly etc. Also, the squeal noise changes its inherent form with the normal load and sliding speed. In this study, the characteristics of brake squeal noise generated by friction is analyzed experimentally. The experiment focused on the analysis of friction self-excited vibration and squeal noise level. Friction self-excited vibration is caused by the dry friction between pads and rotor, and occurs as a function of their relative sliding speeds. And Friction self-excited vibration is raised the brake squeal noise.

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Morphological Analysis of the Rubbed Surface for Hydraulic Driving Material (유압구동 부재의 마찰면 형상해석)

  • 원두원;배효준;조연상;박흥식
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2000.10a
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    • pp.404-409
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    • 2000
  • The determination of surface morphology is believed to be extremely important in the areas of contact mechanics, adhesion and friction. In order to describe morphology of various rubbed surface, the wear test was carried out under different experimental conditions in lubricating wear. And fractal descriptors was applied to rubbed surface of hydraulic driving material with image processing system. These descriptors to analyze surface structure are fractal dimension. Surface fractal dimension can be determined by sum of intensity difference of surface pixel. Morphology of rubbed surface can be effectively obtained by fractal dimensions.

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Morphological Analysis of Oil-Lubricated Surface for Hydraulic Piston Motor (유압 피스톤 모터의 윤활 마찰면 상태 해석)

  • 배효준;강인혁;박정록;박흥식;전태옥
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • 2001.11a
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    • pp.290-295
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    • 2001
  • The surface morphology of oil-lubricated surface for hydraulic piston motor is believed to be extremely effective in contact mechanics. adhesion, friction and wear. In order to describe morphology of various rubbed surface on driving condition, the wear test was carried out under different experimental conditions in oil-lubricated system. And fractal descriptors was applied to rubbed surface of hydraulic driving material with image processing system. These descriptors to analyze surface structure are fractal dimension. Surface fractal dimension can be determined by sum of intensity difference of surface pixel. Morphology of rubbed surface can be effectively obtained by fractal dimensions.

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