• Title/Summary/Keyword: 마찰면

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A Study on the Friction Weldability of Carbon Steel (SM45C) to Aluminum Alloy (A6063) (탄소h강(SM45C)과 알루미늄 합금(A6063)의 마찰용접성에 관한 연구)

  • 강성보;민택기
    • Journal of Welding and Joining
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    • v.16 no.2
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    • pp.57-63
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    • 1998
  • This study deals with the friction weldability of machine structural carbon steel (SM45C) to Al-Mg-Si aluminium alloy (A6063). The bonding strength of friction welded joints, from all mechanical test, exceeded that of A6063 base metal, under the condition of friction time 1.5 sec, upset pressure 80MPa. The friction welded joints under these conditions exhibited tensile strength of 262MPa, bending angle of 90$^{\circ}$ without crack at weld interface and shear strength of 113MPa. Consequently, the friction weldability of SM4C to A6063 was very excellent, and that was possible without special preparation of weld surfaces.

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Optimization on Bar-to-Bar Similar Friction Welding of Hydraulic Valve Spool Steels and the Weld Strength Properties and its AE Evaluation (유공압밸브스풀용 강재의 봉 대 봉 동종대 마찰용접의 최적화와 용접강도 특성 및 AE품질 평가)

  • 오세규;이경우;전태언;오명석;이원석
    • Journal of Ocean Engineering and Technology
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    • v.10 no.2
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    • pp.69-76
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    • 1996
  • In-process quality control and high reliability of the weld are the major concerns in applying friction welding to the economical and qualified mass-production. Experimental examinations and quantitative analysis were performed for the optimiaztion of similar friction welding of hydraulic valve spool steels(SNCM220, SCM435, SACM645, SCM415, ${\varphi}24). The quantitative correlations were found between the initial cumulative counts of acoustic emission(AE) occurring during plastic deformation periods of the welding and the fatigue life as well as weld strength and welding conditions. A real-time evaluation system was developed for the friction weld quality by AE.

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A Study on Tube-to-Tube Similar Friction Welding of Rocket Motor Nozzle Material and its AE Evaluation (로켓모터용 노즐재의 관대관 마찰용접과 AE평가에 관한 연구)

  • Gong, Yu-Sik;O, Se-Gyu;Lee, Bae-Seop
    • Journal of Ocean Engineering and Technology
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    • v.13 no.2 s.32
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    • pp.66-73
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    • 1999
  • This paper presents the experimental examinations and statistical quantitative analysis of the correlation between the cumulative counts of acoustic emission(AE) during plastic deformation periods of the welding and the tensile strength and other properties of the tube-to-tube welded joints of O.D. 30mm (I.D 18mm) nozzle steel. This is a new approach which attempts finally to develop real-time quality monitoring system for friction welding. And this study results in practical possiblility of real-time quality control more than 100% joint efficiency showing good weld no micro structural defects.

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The Study of Quality Evaluation on Dissimilar Material Friction Welding of Poly-urethane Foaming Machine Components (폴리우레탄 발포기 부품 이종재 마찰용접의 품질 평가에 관한 연구)

  • Yang, Yong-Mo
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.11 no.6
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    • pp.75-81
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    • 2012
  • Dissimilar material friction welding such as STD11 and SCM440, we are considering of such things as strength and tenacity of welding interface, which consist of friction welding rotation frequency, friction heating pressure, upset forging-pressure, friction heating time, and upset forging-pressure time. From the study, obtaining the interrelationship between welding condition and quality(toughness, tenacity), we can set the best range of welding condition. while performing acoustic emission examination for the nondestructive evaluation, we can deduce the interrelationship among total acoustic emission counts, friction welding variable, and quality during friction welding, which can solve the manufacturing difficulty and enhance the economic value.

A study on the characteristics of cast iron made by continuous cast iron for the parts of the rotary pump (진공 펌프용 부품에 적용한 연속 주조봉 주철의 특성연구)

  • 박상준
    • Proceedings of the Korean Vacuum Society Conference
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    • 2000.02a
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    • pp.48-48
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    • 2000
  • 진공부품에 사용되고 있는 재료는 여러 가지 있으나 회주철품은 진동 감쇄 및 흡진성이 우수하여 소음 발생이 적고, 조직 중에 흑연이 존재하므로 주강에 비하여 자기윤활작용이 있으며, 말차계수가 적어 마찰면의 면입이 높은 경우에도 소손 등의 이상 마멸현상이 적어 진공펌프, 내연기관, 공작 기계등과 같이 강인성과 내마멸성을 요구하는 부품에 많이 이용되어 왔다, 이 회주철도 대별하면 여러 종류가 있고, 진공 펌프용 재질은 주로 회주철 중에 ASTM A형으로 도면에 명기되어 있다. 따라서 본 제품을 개발하는 과정중에 연속 주조법으로 제조된 ASTM형이 기존의 재료에 비하여 내기밀성, 내마면성, 내피로성 및 기계적 성질등이 우수함을 확인하여본 재질로 개발하였고, 시험한 연구 결과를 발표하고자 한다. 실험은 ASTM A형으로 주조하기 위하여 용해된 용탕을 사형 주형에서 GC200으로 주조하고, ASTM D형은 D사의 연속 주조기에서 직경 30mm로 주조하였다. 이와 같이 주조된 사료를 일정한 크기로 시험편을 만들어 인장 강도, 경도, 피로한도, 피로성, 절삭성, 내유압성, 소입성과 내마멸성을 시험하였다.

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Experimental Study under Reciprocating Sliding on the Friction Noise (왕복운동에서의 마찰소음 실험적 연구)

  • Choi, Hoil;Kang, Jaeyoung
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.23 no.7
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    • pp.640-644
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    • 2013
  • The present study provides the characteristics of friction noise under reciprocating sliding. The friction contact is generated between the aluminum plate and plastic, which results in friction noise. The experimental results reveal that the friction noise under reciprocating sliding can be produced as the friction coefficient increases. It is also shown that the vibration modes of the pin with dominant deflection in the sliding direction is participated on the friction noise.

Humidity Dependence of Tribological Behavior of DLC Films (DLC 필름의 마찰마모 특성의 습도 의존성에 대한 연구)

  • Park, Se-Jun;Lee, Kwang-Ryeol;Lee, Seung-Cheol;Ko, Dae-Hong
    • Journal of the Korean Vacuum Society
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    • v.15 no.3
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    • pp.287-293
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    • 2006
  • Diamond-like carbon (DLC) film was deposited using benzene $(C_6H_6)$ by r. f-plasma assisted chemical vapor deposition. The tribological properties of the DLC film were tested by rotating ball-on-disc type tribometer isolated by a chamber. The tribological test was performed in air environment of relative humidity ranging from 0 to 90% in order to observe the tribological behavior of the DLC film with the change of humidity. We used steel ball and DLC coated steel ball to investigate the effect of the counterface material. Using steel ball, the friction coefficient of DLC film increased from 0.025 to 0.2 as the humidity increased from 0% to 90%. In case of DLC coated steel ball which didn't form the Fe-rich debris, the friction coefficient showed much lower dependence of humidity as 0.08 in relative humidity 90%. We confirmed that the high humidity dependence of the friction coefficient using steel ball resulted from the increase of debris size with humidity and the formation of Fe-rich debris by the wear of steel ball. And the friction coefficient was immediately dropped when the relative humidity changed from 90% to 0% during test using steel ball. From this result, we confirmed that the effect of the Fe-rich debris on the friction coefficient was that Fe element in debris formed the highly sensitive graphitic transfer layer to humidity.

Laboratory Study of the Shear Characteristics of Fault Gouges Around Mt. Gumjung, Busan (부산 금정산일대에 분포하는 단층비지의 전단특성에 관한 실험적 고찰)

  • Woo, Ik
    • The Journal of Engineering Geology
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    • v.22 no.1
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    • pp.113-121
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    • 2012
  • The mechanical characteristics of a fault gouge from near Mt. Kumjung in Kumjung-Gu, Busan, were estimated from laboratory tests on different joint models. Fault gouge samples and joint samples in biotite granite were obtained from boreholes in the study area that had penetrated small faults associated with the Dongnae and Yangsan faults. XRD and SEM analyses revealed that for the fault gouge consists of several clay minerals with tabular structure (kaolinite, montmorillonite, illite, sericite), which could cause the considerable reduction of shear strength when wet. The shear strength of the fault gouge was obtained from direct shear tests of the fault gouge itself and from direct shear tests of several natural/artificial joint surfaces coated with fault gouge. The results indicate that the reduction of shear strength is more abrupt for the joint surfaces coated with fault gouge compared with uncoated joint surfaces, and that the friction angle of the fault gouge between joint surfaces is much lower than the internal friction angle of the fault gouge itself. Fault gouges in contact with rock, therefore, could have a stronger negative effect on the stability of structures in rock masses than the fault gouge itself.

Failure Modes of Vertical Ground Anchor in Plane Strain (평면변형률 상태에 있는 연직지반앵커의 파괴모-드)

  • Im, Jong-Cheol;;Park, Seong-Jae
    • Geotechnical Engineering
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    • v.6 no.1
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    • pp.43-58
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    • 1990
  • In order to get ultimate pullout resistance of ground anchor, the position of failure surface, normal stress and friction angle on the failure surface should be known. In this study, the position of failure surface is obtained by observing deformation of ground around anchor, and stresses on the anchor surface are analyzed by measuring normal and shear stresses on the anchor surface through model anchor test in plane strain. In addition, the relationship between lateral earth pressure and the position of failure surface is analyzed and the formula for calculating ultimate pullout resistance of anchor is proposed by using non-dimensional coefficient of ultimate pullout resistance.

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Anisotropic Shear Strength of Artificially Fractured Rock Joints Under Low Normal Stress (낮은 수직응력 하에서 인공 절리면의 전단 이방성에 관한 연구)

  • 곽정열;이상은;임한욱
    • Tunnel and Underground Space
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    • v.13 no.3
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    • pp.169-179
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    • 2003
  • Anisotropic shear strength of rock joints is studied based on the artificially fractured specimens using experimental and analytical methods. Series of direct shear tests are performed to obtain the strength, stiffness and friction angle of joints under various low normal stresses and shearing directions. The results of shear strength and stiffness show anisotropic value according to shearing direction under low normal stress specially less than 2.45 MPa. But, the effect of joint roughness on strength decreases with increasing normal stress. To estimate more effectively the peak shear strength under low normal stress, the modified Barton's equation is suggested.