• 동력기계공학회지
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• 제6권3호
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• pp.31-35
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• 2002

Brake tube is considered one of the most important parts in automobile. The shape of brake tube end has a great influence on the function of brake, and the quality and productivity of brake tube have relation to die design. The forming process of brake tube end is performed by hydraulic press forming machine. In this paper, the forming processes of tube end for automobile is analyzed and designed to make the optimal form of brake tube end. Also, finite element analysis has been carried out using $DEFORM^{TM}% 3D to predict the optimal shape of brake tube end and the results obtained showed the optimal length between punch and chuck is $1.0{\sim}1.2mm$. The shape of tube end is in good agreement with the finite element simulations and the experimental results.

• 한국공작기계학회논문집
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• 제17권1호
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• pp.113-119
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• 2008

The purpose of the present paper is to investigate the optimal shape of the brake tube-end and flare nut for automobiles using the $DEFORM^{TM}-3D$, finite element code. A flare nut is a small and important part used to join a brake tube-end in automobiles. In this instance, we studied the optimal forging processes for the tube-end and flare nut. Finite element analysis has been carried out to predict an optimal shape of the tube-end and flare nut. Also the simulation results were reflected to the forging processes design for the tube-end and flare nut. The shape of the tube-end and flare nut is in agreement with the finite element simulation and the test results.

• 한국기계가공학회지
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• 제7권4호
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• pp.155-160
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• 2008

End part of the brake tube formed with the shape of snake head is important for the braking of automobile in safety because it has to prevent crack, fracture and defects occurred during the forming process. Especially, the shape of tube end has influence on the ability of brake. Based on the procedure of process design, in this paper, the forming operation is done by finite element method and the design variables are analyzed by Taguchi method. Design variables such as the outer angle of tube end with the shape of snake head(A), the inner angle to make a hole at tube end with the shape of snake head(B) and the forming distance at tube end(C) are used. Optimization of design variables is performed to minimize the damage factor of the tube end occurred during the forming process. The value of damage factor of 0.327 was obtained under the optimal condition like $A=114^{\circ},\;B=80^{\circ}$ and C=5.3mm, respectively.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2002년도 추계학술대회 논문집
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• pp.53-57
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• 2002

Brake tube is considered one of the most important parts in automobile. The shape of brake tube-end has a great influence on the function of brake, and the quality and productivity of brake tube have relation to die design. The forming process of brake tube-end is peformed by hydraulic press forming machine. In this paper, the forming processes of tube-end for automobile is analyzed and designed to make the optimal form of brake tube-end. Also, finite element analysis has been carried out using DEFORM-3D$\^$TM/ to predict the optimal shape of brake tube-end and the results obtained showed the optimal length between punch and chuck is 1.0 ∼ 1.2mm. The shape of tube-end is in good agreement with the finite element simulations and the experimental results.

• 대한기계학회논문집A
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• 제35권11호
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• pp.1429-1436
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• 2011

본 논문에서는 튜브의 내부에 이물질이 있거나, 조명에 의한 영상잡음이 많은 경우에도 내경중심과 내경을 정확하게 측정할 수 있는 머신비전 기반의 새로운 측정알고리즘을 제안하였다. 또한 내경과 외경 중심간의 이격거리인 편심량도 계산할 수 있다. 제안된 알고리즘은 퍼지제어에 바탕을 둔 반복탐색에 의하여 임의의 초기탐색점에서 거리와 방향을 단계적으로 이동함으로써 내경의 중심에 도달하게 한다. 제안된 알고리즘은 계산시간 뿐만 아니라 측정정밀도 면에도 기존의 방법에 비해 우수하였다. 성능을 비교하기 위하여 생산현장에서 생산되는 튜브들을 이용하여 실험을 수행하였고, 실험 결과 제안된 알고리즘을 사용하는 경우가 널리 사용되고 있는 알고리즘인 Hough 변환 방식과 RANSAC 방식보다 계산시간 및 측정정밀도에서 우수함을 보였다.

• 한국기계가공학회지
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• 제10권3호
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• pp.1-6
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• 2011

This study focused on the localization of swivel type tube couplers, which all depend on imports. In this study, a computer application analysis was performed using a finite element method as a preliminary study. In the major developments related to the objective of this study, the air brake system produced by car makers represents a different in the installation point of an air tank according to the type of cars or in the length and direction of its hoses and that leads to cause lots of problems. For solving such problems, the design of the major elements in a swivel type tube coupler was analyzed using a finite element method, and its validity was also verified. In the process that verifies the validity of this study, it was necessary to investigate how much external force affects the desorption of the tube support, which is the most important element in swivel type tube couplers. For achieving the investigation, a pressure test was implemented for the tube support according to the Federal Motor Vehicle Safety Standards(FMVSS). In the results of the pressure test, all samples satisfied the FMVSS. In addition, several tests were implemented by installing the sample of the developed swivel type tube coupler to an actual vehicle. In particular, rotation tests with various angles were applied by welding the swivel type coupler to an air tank through an argon welding process. In the results of the installing test for an actual vehicle, it was verified that the designed structure was determined as a structure that is able to endure the eccentric torque and deformation pressure applied to several directions that are the major problems in such fixed type tube couplers. Therefore, in the comparison of the performance of the developed product with the product of PARKER, it was possible to verify that the localized swivel type tube coupler developed in this study shows more excellent than that of the existing products by PARKER.

• Journal of Advanced Marine Engineering and Technology
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• 제28권1호
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• pp.83-89
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• 2004

Flare nut is an important Part that used to joint a brake tube-end in automobiles. It was made of SWCH 10A by machining. But we studied to make it by metal forming. The main focus of this paper is to investigate an optimal forging processes for flare nut using the DEFORM$^{TM}$-3D. commercially available finite element code and tests. Actually an explicit finite element analysis of the flare nut forging processes has been carried out to predict an optimal shape of the flare nut and its results were reflected in the tests of the forging processes design for flare nut. The simulation results which had obtained from finite element analysis were contributed to the forging processes design for flare nut. An optimal shape of nave nut showed agreements with test results. Furthermore. this paper should contribute to a development of the forging process for a variety of parts.s.

• Composites Research
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• 제28권3호
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• pp.124-129
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• 2015

CNT 및 GNP 는 고강도, 고강성, 열전도율, 내부식성, 전자 차폐성 등 여러 우수한 기계적 특성을 갖기 때문에, 우주 항공분야, 전자기기 소재 및 에너지 소재에 사용되고, 제동 시 흡수 에너지가 크고 안정된 제동 효과를 나타내기 때문에 경주용 자동차나 항공기의 브레이크 디스크 재료로도 각광받고 있다. 본 연구에서는 CNT 중량비를 2 wt% 및 3 wt%, GNP 중량비를 0.5 wt%, 1 wt% 변화시켜 CF/CNT, GNP/Epoxy 복합재료를 제조하였다. 복합 재료는 기계적 방법(3-롤밀)에 의해 제조되었다. 기계적 특성은 인장, 충격 및 마모 테스트를 각각 ASTM D638, D256과 D3181에 따라 수행하였다. 시험 결과 CF/GNP0.5 wt%/Epoxy 복합재료가 인장, 충격, 마모시험에서 우수한 특성을 보였다.