• 제목/요약/키워드: Pipe Processing

검색결과 208건 처리시간 0.026초

조관공정에서 강관의 정밀도 향상을 위한 가공 기술 (Machining technology for precision improvement of steel pipe in tube-mill processing)

  • 정호윤;김정석;강명창;김경수;김정근
    • 한국공작기계학회:학술대회논문집
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    • 한국공작기계학회 2003년도 춘계학술대회 논문집
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    • pp.488-493
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    • 2003
  • This paper presents new skill in tube-mill processing getting the increase in production efficiency and quality in response to the recent request of high grade pipe. In this study, researchers developed the method to improve the precision of pipe and tool life in tube-mill processing. Optimum tool shape is devised by analyzing various simulation and mechanism in cutting process. In order to verify the confidence of the proposed machining technology, it is applied to the real processing machinery in the field.

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고속 이동 판재의 자동 외관 검사를 위한 영상처리 (Image Processing Technique for an Automatic Inspection of the Surface Outlook of High Speed Moving Plate.)

  • 부광석;임성현;조현춘
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 2000년도 제15차 학술회의논문집
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    • pp.219-219
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    • 2000
  • A Plate type pipe is used for heat exchange in radiator of a vehicle. The pipe has several rooms through which water flows and heat is dissipated into outside . In the case that there are small holes, cracks or some scratches on the plate, the radiators lost their functions due to Leakage. This may result in overheating of engine in a car. Thus, we need to perform the entire inspection of the plate type pipe in advance before assembling the radiator. In manufacturing process of the plate type pipe, the productive speed is very high and that may be performed continuously. So, there is no room to perform the outlook inspection by typical image processing techniques. This paper proposes a new method to inspect the outlook surface of the plate type pipe automatically with high speed. Especially, the sequential processing technique of an algorithm which detects defects on the surfaces of the plate type pipe is proposed for line scan camera which captures line image. To evaluate the inspection performance, a series of experiments is performed.

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이미지 프로세싱을 이용한 실배관 시험편의 균열 길이 측정에 관한 연구 (A Study on the Measurement of Crack Length of Pipe Specimen Using Image Processing)

  • 강민성;구재민;석창성;허용
    • 한국안전학회지
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    • 제25권2호
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    • pp.7-11
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    • 2010
  • Difficulties associated with full-scale pipe tests are rather obvious. That is, it is not only difficult to perform them but also very expensive and it requires lots of experience. And the process of the fracture test for the pipe specimen is very difficult and complicated. Because the pipe specimen, the test jig and the test equipment are very large and heavy, it requires lots of costs and times. In this study, to easily perform the fracture toughness test for a pipe specimen, load line displacement data was obtained using the image processing method.

동 파이프 성형 시 치수 변화 및 배관 시스템의 기계적 특성 변화 (Changes in Dimension and Mechanical Characteristics of Copper Pipe System during Pipe Processing)

  • 최제민;김수민;채수원
    • 한국정밀공학회지
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    • 제31권7호
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    • pp.615-622
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    • 2014
  • Copper pipes have been widely used as components of System Air-Conditioner due to high thermal conductivity. This system consists of 150 pipes, which are approximately 10m long in total. Dimensional changes occur during pipe processing such as expansion, reduction and bending. This processing induces changes in length of pipes and makes dimensional differences from original pipes. The summation of the differences of pipes components leads to make huge cumulative dimensional differences. The cumulative differences can cause serious problems such as crack, refrigerant leakage. However the differences have not been considered so far. To satisfy target quality of the system, it is essential to predict and calibrate the differences. In this paper, the changes in dimension were predicted using FEM and it was found that cumulative differences could cause indesirable stress during assembly process. As a result, dimensional differences or indesirable stress could be reduced using the proposed method.

유한요소해석을 이용한 테일파이프의 튜브하이드로포밍 공정 개발 연구 (Development of Tube Hydroforming for a Tail Pipe Using FE Analysis)

  • 한수식
    • 소성∙가공
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    • 제25권3호
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    • pp.176-181
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    • 2016
  • The exhaust tail pipe is the only visible part of the exhaust system on a vehicle. The conventional way to make the tail pipe is welding after stamping. There are various problems that occur during the stamping of stainless steel sheets such as scratching and local fracture. Problems during welding can also occur due to poor weldability. Tube hydroforming can be a solution, which eliminates these problems. The current study deals with the development of tube hydroforming for a vehicle tail pipe using finite element analysis for a free-feeding method. The current study focuses on the development of a proper load path for the tail pipe hydroforming and how bending influences the subsequent processing steps. The FE analysis results were compared with experimental results. This study shows the importance of bending and the necessity of considering bending when performing a tube hydroforming analysis.

Two-module robotic pipe inspection system with EMATs

  • Lee, Jin-Hyuk;Han, Sangchul;Ahn, Jaekyu;Kim, Dae-Hyun;Moon, Hyungpil
    • Smart Structures and Systems
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    • 제13권6호
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    • pp.1041-1063
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    • 2014
  • This work introduces a two-module robotic pipe inspection system with ultrasonic NDE device to evaluate the integrity of pipe structures. The proposed robotic platform has high mobility. The two module mobile robot platform overcomes pipe obstacle structures such as elbow, or T-branch joints by cooperative maneuvers. Also, it can climb up the straight pipeline at a fast speed due to the wheel driven mechanism. For inspection of pipe structure, SH-waves generated by EMAT are applied with additional signal processing methods. A wavelet transform is implemented to extract a meaningful and specific signal from the superposed SH-wave signals. Intensity ratio which is normalized the defect signals intensity by the maximum intensity of directly transmitted signals in the wavelet transforms spectrum is applied to evaluate defects quantitatively. It is experimentally verified that the robotic ultrasonic inspection system with EMAT is capable of non-destructive inspection and evaluation of defects in pipe structure successfully by applying signal processing method based on wavelet transform.

마찰저감을 위한 슬라이딩 금형을 적용한 알루미늄 파이프 요크 냉간 단조공정에 관한 연구 (Study on the Cold Forging Process of Aluminum Pipe Yoke using Sliding Die for Reducing Friction)

  • 이성민;이인규;이성윤;황선광;박재욱;황원석;문영훈;이상곤
    • 소성∙가공
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    • 제32권1호
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    • pp.5-11
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    • 2023
  • The aim of this study is to manufacture an aluminum pipe yoke of automotive steering system for lightweight. In a multistage cold forging process for aluminum pipe yoke, the surface defects frequently occur due to excessive deformation or friction during extrusion process for forming hollow pipe part. It is import to reduce the friction between the material and the forging die. This study investigated a multistage forging process with sliding die to reduce friction for aluminum pipe yoke. After evaluating by FE analysis, the forging experiment with the sliding die was carried out. As a result, it was possible to manufacture a sound aluminum pipe yoke.

맵리듀스를 이용한 정렬 기반의 데이터 큐브 분산 병렬 계산 알고리즘 (Sort-Based Distributed Parallel Data Cube Computation Algorithm using MapReduce)

  • 이수안;김진호
    • 전자공학회논문지
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    • 제49권9호
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    • pp.196-204
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    • 2012
  • 최근 많은 응용 분야에서 대규모 데이터에 대해 온라인 다차원 분석(OLAP)을 사용하고 있다. 다차원 데이터 큐브는 OLAP 분석에서 핵심 도구로 여긴다. 본 논문에서는 맵리듀스 분산 병렬 처리를 이용하여 효율적으로 데이터 큐브를 계산하는 방법을 연구하고자 한다. 이를 위해, 맵리듀스 프레임워크에서 데이터 큐브 계산 방법으로 잘 알려진 PipeSort 알고리즘을 구현하는 효율적인 방법에 대해서 살펴본다. PipeSort는 데이터 큐브의 한 큐보이드에서 동일한 정렬 순서를 갖는 여러 큐보이드를 한 파이프라인으로 한꺼번에 계산하는 효율적인 방식이다. 이 논문에서는 맵리듀스 프레임워크에서 PipeSort의 파이프라인을 구현한 네 가지 방법을 20대의 서버에서 수행하였다. 실험 결과를 보면, 고차원 데이터에 대해서는 PipeMap-NoReduce 알고리즘이 우수한 성능을 보였으며, 저차원 데이터에 대해서는 Post-Pipe 알고리즘이 더 우수함을 보였다.

손가락 관절 운동범위와 MediaPipe를 이용한 3 차원 손 추적 방법 (3D Hand Tracking Method Using the Range of Fingers Joint Motion and MediaPipe)

  • 윤희헌;박정민
    • 한국정보처리학회:학술대회논문집
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    • 한국정보처리학회 2023년도 춘계학술발표대회
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    • pp.752-753
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    • 2023
  • 본 논문에서는 손가락 관절의 운동범위와 MediaPipe 손 추적기를 이용하여 3 차원 손 추적 방법을 설계하였다. MediaPipe 손 추적기가 추정한 신뢰할 수 있는 2 차원 좌표를 바탕으로 손 랜드마크의 깊이를 추정한 후, 손가락 관절 운동범위와 부합한 결과를 도출하였다. 본 논문에서 제안한 3 차원 손 추적 방법은 전용 하드웨어 없이 동작하며 기존의 3 차원 손 추적기에 비해 보다 직관적인 인간-컴퓨터 인터페이스 확산에 긍정적 영향을 줄 것으로 기대한다.

스프링형상 와이어소재를 이용한 접합동시 파이프 압출성형공정 개발에 관한 연구 (Development of a Process to Simultaneously Weld and Extrude Pipe Using a Spring Type Wire Material)

  • 구경만;김태현;진인태
    • 소성∙가공
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    • 제24권5호
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    • pp.317-322
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    • 2015
  • A process for the concurrent welding and extruding of pipe was designed for continuous production of fin tubes. Unlike a conventional pipe extrusion, the new process is able to extrude a pipe continuously without limit of length by using spring type wire material. The current paper provides the basic research for welding during the extrusion using a spring type wire material. The object of the current study is to investigate the possibility that the spring type wire material could be extrude into a welded pipe. The appropriate extrusion ratio was selected through investigation of loads using computer simulations. As a result, experiments showed that pipe could be welded and simultaneously extruded with spring type wire material of aluminum. The tensile strength of the welded and extruded aluminum pipe can reach 80% of tensile strength of original aluminum feedstock.