• 제목/요약/키워드: Surface drawing

검색결과 294건 처리시간 0.024초

고탄소강 와이어의 냉간 인발 시 다이 디자인과 다이 시리즈가 표면 잔류 응력에 미치는 영향 (The Effects of Die Design and Die Series on the Surface Residual Stress of Cold Drawn Eutectoid Steel Wire)

  • 배종구;양요셉;반덕영;박찬경
    • 소성∙가공
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    • 제15권2호
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    • pp.153-157
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    • 2006
  • In this study, the die design and die series on the surface residual stress of cold drawn eutectoid steel wire have been investigated. Test pieces were fabricated using die series with different mean and final reduction ratios. Surface residual stresses in the axial direction were measured by X-ray diffraction, Bruker's 2-dimensional GADDS system. The results were compared with stress profiles that were calculated by 3D and 2D finite element simulations, ABAQUS 6.4 program in finite element analysis(FEA). By means of the FEA method, optimal die shape considering delta-parameter were induced and applied in order to determine die sequence designs. Balance of the drawing stresses was also introduced to optimize die sequence.

유한요소격자에 기초한 일반적인 금형면 묘사와 3차원 박판성형공정에의 응용 (A General Description of Tool Surface Based on Finite Element Mesh and Its Application to 3-D Sheet Forming Processes)

  • 윤정환;김종봉;양동열;김석관;유동진;이재진
    • 대한기계학회논문집A
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    • 제24권3호
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    • pp.550-559
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    • 2000
  • One of the most important factor to be considered for the analysis of sheet metal forming processes is the tool surface description for arbitrarily- shaped sheet metal parts. In the present study , finite element approach is used to describe the arbitrarily shaped tool surface. In finite element mesh approach, tool surfaces ar, described by finite elements. The finite elements mesh description of the tool surface, which is originally described by CAD data, needs much time and time-consuming graphic operation. The method, however, has been widely used to describe a complex tool surface. In the present study, the contact searching algorithm for the finite element mesh approach is developed based on cell strategy method and sheet surface normal scheme. For the verification purpose, a clover cup drawing, Baden-Baden oilpan problem and a trunk floor drawing were investigated. The computational results based on the finite element approach were compared with the results of available parametric patch approach and experiments.

고탄소강 다단 신선 와이어의 표면 온도 상승에 의한 축방향 잔류응력 예측 (Prediction of Axial Residual Stress in Drawn High-Carbon Wire Resulting Due to Increase in Surface Temperature)

  • 김대운;이상곤;김병민;정진영;반덕영
    • 대한기계학회논문집A
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    • 제34권10호
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    • pp.1479-1485
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    • 2010
  • 최근 와이어의 생산성 및 고강도화를 위한 고탄소강의 고속신선으로 인해 와이어 표면의 급격한 온도상승으로 잔류응력이 크게 증가하는 문제점이 발생되고 있다. 와이어의 다단 신선 공정시에는 소성변형과 마찰열에 의하여 와이어 내부의 온도가 더욱 크게 상승하게 된다. 특히, 고속 신선의 경우 마찰에 의한 온도구배가 더욱 크게 되어 와이어 표면층에 축방향 인장 잔류응력을 과도하게 발생시킨다. 따라서, 본 연구에서는 먼저 표면 온도 상승과 축방향 잔류응력과의 관계를 규명한 다음에 와이어의 평형온도 예측 모델을 제안하고, 이를 토대로 표면 온도 상승에 의한 축방향 잔류응력 예측식을 개발하였다. 고탄소강(0.82%C)소재의 다단신선 실험을 통해 얻어진 시편에 대하여 X 선 회절을 이용하여 잔류응력을 측정하여 제안된 예측식을 검증하였다.

복부 드로잉-인 기법이 평지 보행 시 몸통과 다리의 근 활성도에 미치는 효과 (Effects of Abdominal Drawing-in Maneuver on Muscle Activity of the Trunk and Legs during Flat Walking)

  • 안수홍;이수경;조현대
    • 대한물리의학회지
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    • 제15권2호
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    • pp.49-56
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    • 2020
  • PURPOSE: This study examined the difference in muscle activity of the trunk and legs during flat walking with or without an abdominal drawing-in maneuver. METHODS: This study was conducted on 15 healthy males and eight females who were attending D University in Busan. This experiment was conducted after 15 minutes of abdominal drawing-in training using a pressure biofeedback unit before the experiment, and the difference in the muscle activity of the trunk and legs during flat walking with or without an abdominal drawing-in technique was investigated. Surface electromyography was used, and the electrode attachment site was the right sternocleidomastoid muscle, splenius capitis muscle, rectus abdominis muscle, external abdominal oblique muscle, transverse abdominis muscle, erector spinae muscle, vastus medialis muscle, and vastus lateralis muscle (TM DTS, Noraxon, USA). The data were analyzed statistically using a paired t-test on SPSS version 18.0 (IBM). RESULTS: The muscle activity of the rectus abdominis muscle, external abdominal oblique muscle, transverse abdominis muscle, vastus medialis muscle were increased significantly and maintained more than walking without maintaining an abdominal drawing-in maneuver (p < .05). Moreover, muscle activity of the erector spinae muscle was decreased significantly and maintained more than walking without maintaining an abdominal drawing-in maneuver (p < .05). CONCLUSION: Maintaining an abdominal drawing-in maneuver during flat walking is more effective during walking training.

손 인터페이스 기반 직관적인 공간 드로잉 시스템 (Intuitive Spatial Drawing System based on Hand Interface)

  • 고기남;김세림;김영은;남상훈
    • 디지털콘텐츠학회 논문지
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    • 제18권8호
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    • pp.1615-1620
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    • 2017
  • VR 관련 기술들의 발달로 인하여 VR 기기의 성능이 좋아지고 보급화가 가능한 가격이 되면서 많은 사람들이 VR 기술을 쉽게 접할 수 있게 되었다. VR 드로잉 어플리케이션은 사용자에게 복잡하지 않으며 완성도가 높은 어플리케이션으로 교육 및 공연 등에 사용되고 있다. 컨트롤러를 사용하여 공간 드로잉 하는 인터페이스 방식은 사용자의 드로잉 인터페이스가 컨트롤러에 제약적이 된다. 본 연구에서는 HMD 전면부에 Leap Motion을 부착하여 HMD 전면부에서 움직이는 사용자의 손을 추적하여 곡면을 그림으로써 컨트롤러를 사용해보지 않은 사용자도 직관적으로 드로잉 어플리케이션을 사용할 수 있는 시스템을 제안하였다.

비정형 건축 형상정보의 효과적인 전달을 위한 도면표현요소 연구 (Drawing Elements and Methods for Delivering Shape Information of Freeform Architecture)

  • 박한희;김동현
    • 대한건축학회논문집:계획계
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    • 제35권9호
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    • pp.89-99
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    • 2019
  • In the representation of buildings with continuous changes in the curved shape of the surface, countless plans or sections are required, or none of the traditional drawings can explain the geometry of it. In other words, in no case can an ordinary drawing achieve the efficient and clear communication capability which is inherent function of the drawings. As a result, the current architects are introducing their own way of drawing technique which is developed in accordance with a specific curved shape, construction method or company resources, but this is not what can be applied to other cases because it has not been ever shared or agreed in the industry. In this process, the drawing or construction of curved building has been recognized as the exclusive property of a specific expert, or the design and construction without the in-depth understanding of the technology have resulted in the appearance of poor buildings. Therefore, this study aims to present an elements and method that can convey shape information more effectively and clearly in the drawing representation of non-linear buildings and, thus, contributes to lowering the barriers to entry into the field by providing the information to be easily applied to related projects. In order to attain this goal, the drawings of recently completed projects of free form building are analyzed to reveal the method used to effectively express the shape information of the building and to derive new drawing elements that have not been applied to the existing drawings.

CAE 와 쾌속조형/쾌속툴링을 이용한 전자제품용 소형 금형의 개발에 관한 연구 (Investigation into the development of deep drawing tools with small size for electronic parts utilizing the CAE and RP/RT technology)

  • 안동규;이상훈;김민수;한길영;김진석;문현수;윤영석
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2005년도 추계학술대회 논문집
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    • pp.334-337
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    • 2005
  • The objective of this research works is to propose a rapid development methodology of small size deep drawing tools for electronic parts utilizing the technology combination of CAE and RP/RT. The technology is applied to the development of deep drawing tools with a drain shape. The final surface of tools is obtained from the evaluation of the formability using the CAE. In order to manufacture the physical prototype of tools fer try-out terming, several fabrication experiments are carried out for three types of rapid tool manufacturing technology. Through the fabrication experiments, the acceptable rapid manufacturing technologies of deep drawing tools with a small size have been proposed.

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정수기 냉온수 탱크 원통형 드로잉 제품의 재질 변화에 따른 두께 변화에 관한 연구 (A study on the change of thickness according to material change of water purifier cold and hot water tank cylindrical drawing products)

  • 장은정;이춘규
    • Design & Manufacturing
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    • 제15권3호
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    • pp.13-18
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    • 2021
  • In plate forming technology, cylindrical drawing process is widely used in industry due to technological development. In this study, we used stainless steel 3042B and stainless steel 304J1, which are the most commonly used materials in the production of cold and hot water tanks for water purifiers, among cylindrical drawing products. Under the same conditions, the thickness of the sidewall of the product formed by drawn experiment was studied. As a result of the experiment, the bottom thickness of stainless steel 304J1 was considered to be thick. It is judged that the defect rate can be reduced by changing the breaking phenomenon of the floor surface of the cold and hot water bottles to the material of stainless steel 304j1. Stainless steel 304 2B material shows a sharp change in thickness from punch corner R to sidewall position, while stainless steel 304J1 material showed a uniform change from punch corner R to sidewall position. Stainless steel 304J1 material is considered to improve the clamping of the product in the process of extracting the product after hand drawing. The appearance of stainless steel 3042B products is considered to produce more wrinkles in the flange, which exerts greater tensile force on the sidewall during molding, resulting in uneven sidewall thickness.

고탄소강 다단 신선 와이어의 표면 잔류응력 예측모델 (Prediction Model of Surface Residual Stress for Multi-Pass Drawn High Carbon Steel Wire)

  • 김대운;이상곤;김병민;정진영;반덕영;이선봉
    • 소성∙가공
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    • 제19권4호
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    • pp.224-229
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    • 2010
  • During the multi-pass wire drawing process, wires suffer a great amount of plastic deformation that is through the cross-section. This generates tensile residual stress at surface of drawn wires. The generated residual stress on surface is one of the problems for quality of wires so that prediction and reduction of residual stresses is important to avoid unexpected fracture. Therefore, in this study, the effect of process variables such as semi-die angle, bearing length and reduction ratio on the residual stress was evaluated through Finite Element Analysis. Based on the results of the Analysis, a prediction model was established for predicting residual stress on the surface of high carbon steel(AISI1072, AISI1082). To identify the effectiveness of the proposed model, X-ray diffraction is used to measure the residual stresses on the surface. As the result of the comparison between calculated residual stresses and measured residual stresses, the model could be used to predict residual stresses in cold drawn wire.