• 제목/요약/키워드: Press Forming

검색결과 529건 처리시간 0.032초

Knife Press Forming 공정의 후육관 성형성 예측 (Estimation on Formability of ]Knife Press Forming Process for the Thick Pipes)

  • 박중원;노학곤;구태완;강범수
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 2009년도 추계학술대회 논문집
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    • pp.319-322
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    • 2009
  • Roll bending process has been used for manufacturing the pipes. However, it is not suitable process for the thick pipes. Knife press forming is acceptable process for the thick pipes. Recently, the knife press forming process using brake bending press have been performed. In this study, the estimation on formability of knife press forming process for the thick pipes is carried out. From the results, it is ensured that the thick pipes could be obtained by the knife press forming process.

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프레스 포밍 머신의 티타늄과 알루미늄 판재 성형성에 관한 연구 (A study on Press Forming Machine of Titanium and Aluminium Plates Formability)

  • 정원재;강한빈;이동욱;박민혁;송주한;이석순
    • 한국기계가공학회지
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    • 제12권5호
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    • pp.86-93
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    • 2013
  • Main function of the Press forming Machine is the forming for plates. The head of the Press forming machine consist of several parts. It was named Press forming-contraction and Press forming_expansion according to formability of plates. Aluminium and Titanum plates are forming by using the Press forming machine. In this study, we analyzed sheet metal forming including plastic deformation and the contact pressure in the bearing. Finite element analysis results of Press forming-contraction and Press forming_expansion show the similar results of the actual specimen plates and the bearing contact pressures show the acceptable level of stress in both aluminum and titanium specimens.

마그네슘 판재 프레스 성형에 의한 노트PC 케이스 제작 (Note-PC Case Fabrication by Magnesium Alloy Sheet Press Forming)

  • 김흥규;우성식;이재근;허영무
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 2008년도 춘계학술대회 논문집
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    • pp.337-340
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    • 2008
  • Magnesium alloy is expected to be widely used for mobile electronic appliances as well as automobile parts for its lightweight and EMI-shielding characteristics. In the present investigation, a Note-PC upper case made of magnesium alloy AZ31 sheet was developed by using the press forming technology at elevated temperature. Considering the press forming process and the formability of magnesium alloy sheet, the case shape and the press die was designed. The optimum forming condition was experimentally examined. Then the as-received magnesium alloy sheet was press-formed into the designed case shape under the optimum forming condition.

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프레스 공정 단축을 위한 회전식 트랜스퍼 성형장치 개발 (Development of Rotary Transfer Forming Device for Process Reduction in Forming)

  • 김승기;윤재웅
    • 한국생산제조학회지
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    • 제23권5호
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    • pp.413-420
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    • 2014
  • Although the transfer forming process has various advantages, it is also inefficient for the use of multiple press machines, especially for small part sizes. In this study, a new forming process was proposed to use multiple tandem dies in a single press machine. A rotary transfer forming device was developed to combine the advantages of the progressive and transfer forming process. In this study, a detailed forming process using this device was analyzed, and the device was designed to perform four series of tandem forming processes in a single press. In order to analyze the feasibility of this forming process, simple forming dies were made. As a result, the position accuracy was 4 arcsec, and the forming speed reached up to 20 strokes per minute. It is thought that this rotary transfer forming device can help to save initial setup costs through the more efficient use of space in a press machine.

유한요소해석을 이용한 열간프레스성형 적용 로어 컨트롤 암의 성형품질 조건 최적화 (Optimization of Conditions of Forming Quality for Hot-press-formed Lower Control Arm Using Finite Element Analysis)

  • 손현성;최병근
    • 한국자동차공학회논문집
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    • 제19권1호
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    • pp.45-50
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    • 2011
  • Hot-Press-Forming (HPF), an advanced sheet metal forming method using stamping at a high temperature of about $900^{\circ}C$ and quenching in an internally cooled die set, is one of the most successful forming process in producing crash-resistant parts such as pillars and bumpers with complex shape, ultrahigh strength, and minimum springback. To optimize conditions of a forming quality in HPF process and secure a safe product without any failures, such as fractures and wrinkling, the simulations based on the coupled thermo-mechanical analysis for a hot-press-formed lower control arm are applied with Taguchi's orthogonal array experiment. Three factor variables - the friction coefficient, blank shape, and hole location for burring - are selected to be optimized. The most effective condition of a forming quality for a hot-press-formed lower control arm is suggested. The simulation results are confirmed with experimental ones.

다점 프레스를 이용한 곡면 성형의 가공 정보 산출을 위한 IDA방법 (Application of IDA Method for Hull Plate Forming by Multi-Point Press Forming)

  • 윤종성;이장현;유철호;황세윤;이황범
    • 한국해양공학회지
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    • 제22권6호
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    • pp.75-82
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    • 2008
  • Flame bending has been extensively used in the shipbuilding industry for hull plate forming In flame bending it is difficult to obtain the desired shape because the residual deformation dependson the complex temperature distribution and the thermal plastic strain. Mechanical bending such as reconfigurable press forming multi-point press forming or die-less forming has been found to improve the automation of hull plateforming because it can more accurately control the desired shape than line heating. Multi-point forming is a process in which external forces are used to form metal work-pieces. Therefore it can be a flexible and efficient forming technique. This paper presents an optimal approach to determining the press-stroke for multi-point press forming of curved shapes. An integrated configuration of Finite element analysis (FEA) and spring-back compensation algorithm is developed to calculate the strokes of the multi-point press. Not only spring-back is modeled by elastic plastic shell elements but also an iterative algorithm to compensate the spring-back is applied to adjust the amount of pressing stroke. An iterative displacement adjustment (IDA) method is applied by integration of the FEA procedure and the spring-back compensation work. Shape deviation between the desired surface and deform£d plate is minimized by the IDA algorithm.

크랭크 프레스와 유압 프레스에서 스테인리스 강판의 온간 드로잉성 비교 (Comparison of Warm Deep Drawability of Stainless Steel Sheet Between Crank Press and Hydraulic Press)

  • 김종호;최치수;나경환
    • 소성∙가공
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    • 제4권4호
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    • pp.345-352
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    • 1995
  • Warm deep drawing for optimum forming conditions to give the maximum drawing depth is investigated and compared with the results from experiments performed at room temperature. Experiments which draw square cups of STS 304 stainless steel sheet under the constant lubrication condition of teflon film are made both in a crank and hydraulic press for two kinds of specimens. The maximum drawing depth at warm forming condition reaches 1.4 times the drawing depth at room temperature in a crank press, whereas 1.6 times in a hydraulic press, and also more uniform distribution of thickness in case of warm deep drawn cup is observed. The effects of other factors on formability, such as forming temperature, speed of press and cooling of punch are examined and discussed.

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핫프레스포밍용 주조, 단조 금형에 대한 시간과 압력에 따른 대류열전달계수의 예측 (The Prediction of Interfacial Heat Transfer Coefficient According to Contact Time and Pressure in Forging and Casting Die Materials for the Hot Press Forming)

  • 김낙현;강충길
    • 소성∙가공
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    • 제19권6호
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    • pp.378-386
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    • 2010
  • Nowadays there has been great interest in using heat treated cast material for press dies due to several advantages like reduction in die production costs. However, in hot press forming processes H13 forged tool steel is mostly used. Cooling performance of dies in hot press forming processes is considered as an important factor of study and also the IHTC parameter between cast material die and sheet metal should be considered as an essential. In the present study, the IHTC was calculated for the sheet metal in the hot press forming process with cast and forged material dies. The temperature measurements were performed for the sheet metal, casting and forged material dies by applying various contact pressure in hot press forming. IHTC was calculated and studied by adopting the inverse heat convection method in DEFORM-2D. Each IHTC was considered as a function of contact time and contact pressure. The experimental data were compared with calculated data obtained from the proposed equation and references.

자동변속기용 드럼클러치의 유동제어 성형공정 및 실험장치 개발 연구 (A Study on the Flow Control Forming Process and Experiment Device of Drum Clutch for Automatic Transmission)

  • 박종남
    • 한국기계가공학회지
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    • 제12권6호
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    • pp.69-76
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    • 2013
  • This paper presents the development of the FCF method for the manufacturing of final products using numbers related to the minimum amount of work. The utilized product is a drum clutch, which is part of the transmission of an automobile. A double acting press is secured first and a prediction of the forming load on the practical material is made through an experiment with a plasticine model. Also, a finite element simulation using product shape and properties is performed, as well as a press experiment. A double acting press is manufactured that is suitable for a double acting experiment with a conventional hydraulic press(200 tons). A peripheral device for the press is additionally designed for experimental purposes. And, the press has as its essential points the drive speed, stroke control, etc., all of which influence the forming and is modified. Especially, a laser system is used for velocity measurement of two punches. The forming load of a practical material is predicted in order to derive a forming load formula for cold conditions on the basis of approximate similarity theory. Finite element analysis of the relative velocity ratio(RVR), etc., for most suitable flow defect(unfilling, etc.) prevention is achieved as well. The results are verified through a press experiment.

선박 외판 성형에서 목적 형상과 전개 평판의 최적 정합을 위한 ICP(Iterative Closest Point) 알고리즘 적용 (Application of ICP(Iterative Closest Point) Algorithm for Optimized Registration of Object Surface and Unfolding Surface in Ship-Hull Plate Forming)

  • 이장현;윤종성;류철호;이황범
    • 한국CDE학회논문집
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    • 제14권2호
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    • pp.129-136
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    • 2009
  • Generally, curved surfaces of ship hull are deformed by flame bending (line heating), multi-press forming, and die-less forming method. The forming methods generate the required in-plane/bending strain or displacement on the flat plate to make the curved surface. Multi-press forming imposes the forced displacements on the flat plate by controlling the position of each pressing points based upon the shape difference between the unfolded flat plate and the curved object shape. The flat plate has been obtained from the unfolding system that is independent of the ship CAD. Apparently, the curved surface and the unfolded-flat surface are expressed by different coordinate systems. Therefore, one of the issues is to find a registration of the unfolded surface and the curved shape for the purpose of minimum amount of forming works by comparing the two surfaces. This paper presents an efficient algorithm to get an optimized registration of two different surfaces in the multi-press forming of ship hull plate forming. The algorithm is based upon the ICP (Iterative Closest Point) algorithm. The algorithm consists of two iterative procedures including a transformation matrix and the closest points to minimize the distance between the unfolded surface and curved surfaces. Thereby the algorithm allows the minimized forming works in ship-hull forming.