• Title/Summary/Keyword: Brake Pipe

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A Study on Forming for Brake Pipe of Automobiles using Finite Element Method (유한요소법을 이용한 자동차용 브레이크 파이프의 성형에 관한 연구)

  • Min, Byeong-Hyeon;Jea, Wone-Soo;Ye, Sang-Don
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.7 no.3
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    • pp.47-49
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    • 2008
  • The brake pipe is important part in automobile. The brake pipe have to prevent crack, fracture and defects for braking in safety. Especially, shape of ends of pipe has influence on ability of brake. Based on the procedure of process design, in this paper, the forming operation is designed by finite element method. Design variable and response value was selected shape of die and damage factor. To improve die that performed FEM and compared results of two types of die.

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A Study on Structural Integrity of Brake Bending Press (Brake Bending Press 구조 건전성에 관한 연구)

  • Park, J.W.;Lee, H.M.;Kim, S.M.;Ku, T.W.;Kang, B.S.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2008.10a
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    • pp.190-193
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    • 2008
  • Thick pipes which have large thickness have been used in fields of ocean and industrial plants, and for oil pipelines, water pipes and pipe arrangement. In manufacture of the pipes, roll bending process has been used mostly. However, studies on the pipe forming processes using brake press have been performed in recent days. Normally, the brake press has high aspect ratio, so analysis of structural integrity should be conducted. In this study, the evaluation of structural integrity of the brake bending press was carried out for thick pipe forming process.

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Structural Integrity Evaluation of 10,000 Ton Brake Bending Press (10,000 Ton Brake Bending Press 구조 건전성에 관한 평가)

  • Park, Jung-Won;Lee, Hyun-Min;Ku, Tae-Wan;Kim, Jeong;Kang, Beom-Soo
    • Proceedings of the KSME Conference
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    • 2008.11a
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    • pp.529-533
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    • 2008
  • Thick pipes have been used in fields of ocean and industrial plants, and pipe arrangement of oil and water pipelines. Mostly, roll bending process has been used in manufacture of the pipes. Recently, however, studies on the pipe forming processes using brake press have been performed. Normally, the brake press has high aspect ratio, so structural integrity evaluation should be conducted. In this study, finite element analysis of structural integrity for the brake bending press was carried out for thick pipe forming process.

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Numerical Prediction of the Outer Diameter for SAW Pipes Formed by Press-Brake Bending (프레스-브레이킹 굽힘 공정을 이용한 SAW 후육강관의 외경 예측을 위한 해석적 연구)

  • Park, G.B.;Kang, B.K.;Kang, B.S.;Ku, T.W.
    • Transactions of Materials Processing
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    • v.25 no.2
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    • pp.116-123
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    • 2016
  • Press-brake bending is used to shape flat and thick plates into a targeted circular configuration without excessive localized thinning or thickening. A brake bending press called 'a knife press bending apparatus' has been widely adopted to manufacture thick, large and long pipe from initially thick plate. Submerged Arc Welded (SAW) pipes are also produced by employing press-brake bending. These pipes are mainly used for oil, natural gas and water pipelines. The principal process variables for press-brake bending can be summarized as stroke of the press-brake knife, the distance between both roll in the lower die, and the feeding length of the plate. Many combinations of these process variables are available, thus various pipe diameters can be realized. In the current study, a series of repetitive numerical simulations by feeding a thick plate with initial thickness of 25.4mm were conducted with the consideration of elastic recovery. Furthermore, an index for SAW pipe production is proposed which can be widely used in industry.

A Study on Application of Hydraulic Brake System (전동차 제동기의 유압화에 관한 연구)

  • Lee, Han-Min;Kim, Gil-Dong;Oh, Seh-Chan;Park, Sung-Hwan
    • Proceedings of the KIEE Conference
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    • 2008.04c
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    • pp.169-171
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    • 2008
  • The brake systems of the rolling stocks are generally consisted of electrical and mechanical brake systems. Because of its inherent structure of the each brake system, the electrical brake system is mainly used at the high speed range while the mechanical brake system is used at the relatively lower speed range. It is desirable for the rolling stocks to apply the entire electrical brake system. However, since the brake force from electric brake system is not enough to stop the rolling stock within the legal stop distance. Therefore, the mechanical brake system is indispensable to rolling stocks. In general, the vast majority of the world trains are equipped with mechanical braking systems which use compressed air as the force to push block on to wheels or pads on to discs. These mechanical systems are known as air brake or pneumatic brakes. For the air brake system, basically huge scale air compressor is equipped and the long pipe line is complexively connected. Since mass of these air brake components, it is difficult to be a light weight equipment and the long pipe line raise the maintenance problem. In order to overcome these problems of air brake system, the hydraulic brake system is proposed in this research. The hydraulic brake system makes the whole weight of brake equipment be light and large braking force can be applied. Therefore, in this research, the validity and advantages of applying the hydraulic brake system are reviewed.

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A Study on Pressure Control Method of Train Brake System (철도차량 제동기의 압력제어에 관한 연구)

  • Lee, Han-Min;Kim, Gil-Dong;Park, Sung-Hwan
    • Proceedings of the KSR Conference
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    • 2008.06a
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    • pp.1909-1915
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    • 2008
  • The brake systems of the rolling stocks are generally consisted of electrical and mechanical brake systems. Because of its inherent structure of the each brake system, the electrical brake system is mainly used at the high speed range while the mechanical brake system is used at the relatively lower speed range. It is desirable for the rolling stocks to apply the entire electrical brake system. However, since the brake force from electric brake system is not enough to stop the rolling stock within the legal stop distance. Therefore, the mechanical brake system is indispensable to rolling stocks. In general, the vast majority of the world trains are equipped with mechanical braking systems which use compressed air as the force to push block on to wheels or pads on to discs. These mechanical systems are known as air brake or pneumatic brakes. For the air brake system, basically huge scale air compressor is equipped and the long pipe line is complexively connected. Since mass of these air brake components, it is difficult to be a light weight equipment and the long pipe line raise the maintenance problem. In order to overcome these problems of air brake system, the hydraulic brake system is proposed in this research. The hydraulic brake system makes the whole weight of brake equipment be light and large braking force can be applied. Therefore, in this research, the validity and advantages of applying the hydraulic brake system are reviewed.

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Experimental Study on the Pressure Characteristics of Pneumatic Brake for Freight Train (화물열차의 공기제동 압력 특성에 관한 실험적 연구)

  • Nam, Seong-Won;Moon, Kyung-Ho;Lee, Dong-Hyung
    • Proceedings of the KSME Conference
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    • 2000.04b
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    • pp.593-598
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    • 2000
  • Experimental study is conducted to clarify the pneumatic characteristics of brake system for freight train. Empty-load and diaphragm brake systems are mainly installed in the freight trains owned by KNR(Korean National Railroad). Experimental train set is composed of sixteen freight train and one diesel locomotive that are now in use. From the experimental results, in case of commercial brake, empty-load brake system responds to the brake command more slowly than the diaphragm brake system. But, in case of release command, the response time of diaphragm brake system is shorter than that of empty-load one. In the emergency brake test, the decreasing rate of brake pipe pressure of tenth car is almost same that of decreasing rate of commercial brake service.

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A Case Study on Failure and Analysis of Air Over Hydraulic Brake Line (공기 유압식 브레이크 라인 파손 사례 및 파손 분석 연구)

  • Park, Jeongman;Park, Jongjin
    • Journal of Auto-vehicle Safety Association
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    • v.12 no.2
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    • pp.47-55
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    • 2020
  • In this case study, the brake line failure of air over hydraulic(AOH) brake system is described. AOH brake system is applied to commercial vehicles between 5 to 8 tons. It consists of a hydraulic system using compressed air and operates the air master to form hydraulic pressure to transfer braking power to the wheels. When the brake lines of the system applied to vehicles with high load capacity are damaged, the braking force of one shaft is lost, and the braking distance increases rapidly, leading to a big accident. Failure of the brake line occurs due to various causes such as road surface fragmentation, corrosion of the line, and aged deterioration of air brake hose. The braking force could be decreased even when a very small break in the form of a pin-hole occurs. However, it is difficult to find a part where the thickness of the line is thin due to stone pecking or corrosion generated in the pin-hole formed on the brake line located under the lower part of the vehicle by the sensory evaluation or the conventional braking force test. Accordingly, it is necessary to analyze the condition and cause of the failure of the brake line more precisely when the accident investigation of the heavy vehicles, and also to examine the necessity of the advanced test for the aged brake line.