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  • Title/Summary/Keyword: ?드로잉 가공

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A study on the effect of die profile radius on formability in deep-drawing process with spring-type blankholder system (스프링형 블랭크홀더방식의 디프드로잉 가공에서 다이 윤곽반경이 성형성에 미치는 영향에 관한 연구)

  • 이종국;강명순
    • Journal of the korean Society of Automotive Engineers
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    • v.11 no.4
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    • pp.35-42
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    • 1989
  • The major purpose of this paper is a study on the effect of die profile radius on the formability of spring-type blankholder system in deep drawing process. By drawing the various materials, formability is studied by means of checking the drawing force, blankholding force variation, limiting drawing ratio and wall wrinkling phenomenon. As the die profile radius increases, the maximum drawing force and maximum blankholding force decrease regardless of lubrication condition. Because better lubrication induces blankholding force to rise, spring type blankholder system is better to protect flange wrinkling phenomenon than constant pressure type. And wall wrinkling phenomenon was not detected in experimental die radius range, so the Miyakawa's upper wrinkling limit is understimated in case of material tested.

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Trajectory Optimization Method for Portrait Drawing Robot (초상화를 그리는 로봇을 위한 드로잉 경로 최적화 방법)

  • Lee, Geun-Joo;Kim, Sang-Wook
    • Annual Conference of KIPS
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    • 2011.04a
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    • pp.1165-1168
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    • 2011
  • 본 연구는 휴머노이드 로봇 중에서 사람과 같은 방법으로 초상화를 그리는 로봇 암의 이동 궤적 최적화에 대해 기술한다. 이전에도 이러한 사람의 얼굴을 초상화로 그리는 로봇이 존재하였지만 대부분 인간과 유사한 움직임을 보이지 못하고 딱딱하고 단조로운 움직임을 보였다. 이런 단점을 보완하기 위해 가장 짧은 궤적을 찾는 알고리즘을 사용하여 보다 유연한 움직임을 구현하고, 초상화를 그리는 일련의 과정 중에서 입력된 영상을 가공하여 인간과 같이 그릴 수 있는 좌표를 효과적으로 정렬하고, 추출된 좌표를 바탕으로 로봇 암의 가장 빠르고 효율적인 이동궤적을 구한다.

A Study on the Influence of the Integrated Structure and Independent of the Die Pad on the Products thickness in the Drawing Process (드로잉 가공에서 다이패드의 독립형과 일체형 구조가 제품 두께에 미치는 영향에 관한 연구)

  • Lee, Chun-Kyu;Nam, Seung-Done
    • Journal of the Korea Safety Management & Science
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    • v.17 no.2
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    • pp.235-240
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    • 2015
  • Using a progressive die of the multi-stage drawing product, It was experiments for the Influence of the Products Roundness on the die pad process Safety die model, obstacle countermeasure research safety die design When the die pad is independent structure, Sidewall thickness of the inside 2stage, 3stage, 4stage of the product is thicker, the thickness of the inside 1stage and the bottom is thinner. it was become unstable beacuse the inside 1stage related to the Products Roundness is thinner. When the die pad is Integrated structure, Sidewall thickness of the inside 1stage, 2stage of the product is thicker, and Sidewall 3stage and 4stage was a thin. it was become unstable beacuse the inside 3stage related to the Products Roundness is thinner. Therefore, The appropriate combination of and integrated independent is required for each process.

A Study on the Process Planning for Secondary Operations on Features of Deep Drawing Cup and the Development of the Expert System-Based CAPP (Deep Drawing의 후가공 특징형상 공정설계 및 전문가시스템 개발에 관한 연구)

  • 오준환;이재원;조성진;남배중;양재우
    • Journal of the Korean Society for Precision Engineering
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    • v.15 no.11
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    • pp.46-57
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    • 1998
  • Even though there are some studies on the deep drawing process and process planning, little study has been done on the methodology of process planning of secondary operations of deep drawing such as 'piercins'. In this paper, first, we systematized the methodology of the process planning of secondary operations on axisymmetric cup. Second we described the development of the expert system for their CAPP For these studies, we extracted the knowledge of their process planning from experts and analysed and systemized them. To develop the expert system, rule-based reasoning paradigm is used. The shape information of manufacturing features of secondary operations are manually input to the system through SUI. The process planning results are automatically connected to AutoCAD. We believe that the systematized process knowledge and the development of the expert system for its CAPP could give lots of aids to the associated field.

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A study on measuring friction vibration in flange area during deep drawing process (프레스 딥 드로잉 가공 시 플랜지부의 마찰진동 측정에 관한 기초연구)

  • Jae-Woong Yun
    • Design & Manufacturing
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    • v.17 no.4
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    • pp.8-13
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    • 2023
  • In this study, it was studied whether a new measurement factor "frictional vibration" that occurs due to the material flow of the die and sheet metal in the flange area during deep drawing process, could be measured using an vibration sensor. The blank holder force acting on the flange area during drawing processing acts as a friction force in the opposite direction into which the sheet material flows and causes friction vibration. As the blank holder force increases, the friction force increases, and as the blank holder force decreases, the friction force also decreases. Because of this, friction vibration also increases and decreases in proportion to the size of the blank holder force. According to this theory, whether frictional vibration occurs was measured using a flange simulator and a vibration sensor. The initial pressure was created using a torque wrench, and it was confirmed that the amplitude increased by about 4 times when torque 6 Nm was increased. When the forming velocity was rapidly changed to 300 mm/min, the amplitude increased approximately 4 times. It was confirmed that the amplitude of frictional vibration according to the measurement location was greater the further away from the specimen. It was verified that a new measurement factor "friction vibration" in the flange area can be measured and used for online monitoring.

Influence of Blankholding Force and Blank Diameter on the Drawability and Quality of Very Small Cylindrical Cups (극소형 원통컵의 드로잉성과 품질에 미치는 블랭크 홀딩력과 블랭크 직경의 영향)

  • Lee, K.S.;Kim, J.B.;Jung, W.J.;Kim, J.H.
    • Transactions of Materials Processing
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    • v.23 no.8
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    • pp.489-494
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    • 2014
  • Micro forming is an appropriate process to manufacture very small metal parts which can be employed in the field of electronic devices or electrically controlled mechanical systems. The purpose of the current study was to investigate the influences of both blankholding force and blank diameter for the deep drawing of very small cups. It is essential to control the blankholding force because improper force can result in defects such as wrinkles in the flange or cracks in the corner of the drawn cups. In the current study blankholding force was controlled by springs connected to the blankholder of a press die. Exchangeable bushing dies with various die-corner radii were also used. To obtain the limit drawing ratio for each working condition several sizes of circular specimens were prepared using blanking tools. Beryllium copper(C1720) alloy sheet of 50μm thickness was chosen for the experiments. The maximum limit drawing ratio of 2.1 was achieved experimentally for the conditions of the blankholder force(BHF)=5.3kgf and Rd=0.3mm. Both thickness and hardness along the central section of drawn cups were measured and compared for different drawing conditions. It was found that the deviation of measured data in the thickness and hardness distribution increases with increasing blankholder force and blank diameter.

Process and Die Design of Square Cup Drawing for Wall Thickening (사각형 판재성형 시 벽두께 증육을 위한 금형 및 공정 설계)

  • Kim, Jinho;Hong, Seokmoo
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.16 no.9
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    • pp.5789-5794
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    • 2015
  • Recently, thin and light-weight production technologies are needed in IT industry in accordance with increase of the smart phones and mobile PC products. In order to make light and high rigidity products, engineering plastic and aluminum materials are frequently used in products appearance and frame hat support structure. Especially aluminum extrusion and CNC Brick processes are widely used for high strength and high rigidity technology. But extrusion method has constraints to apply exterior design and CNC Brick process has relatively high production cost and low speed of manufacturing. In this research, a new process method is introduced in order to reduce material cost and to improve manufacturing speed dramatically. Plate forging process means basically that thickening of local wall area thickness after deform exterior shape by deep drawing and bending process. Therefore, it is possible to minimize the waste of material and the manufacturing time. In this study the process of plate forging is designed using finite element program AFDEX-2D and the thickness and the width of initial deformed blank. And it is verified as a sample which is a part of laptop developed through the proposed plate forging method.

Prediction for Thickness and Fracture of Stainless Steel-Aluminum-Magnesium Multilayered Sheet during Warm Deep Drawing (온간 딮 드로잉에서 이종금속판재(STS430-Al3004-AZ31)의 파단 및 두께 예측을 위한 연구)

  • Lee, Y.S.;Lee, K.S.;Kim, D.
    • Transactions of Materials Processing
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    • v.21 no.1
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    • pp.49-57
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    • 2012
  • It is difficult to estimate the properties of multilayered sheet because they are composed of one or more different materials. Plastic deformation behavior of the multilayered sheet is quite different as compared to each material individually. The deformation behavior of multilayered sheet should be investigated in order to prevent forming defects and to predict the properties of the formed part. In this study, the mechanical properties and formability of stainless steel-aluminum-magnesium multilayered sheet were investigated. The multilayered sheet needs to be deformed at an elevated temperature because of its poor formability at room temperature. Uniaxial tensile tests were performed at various temperatures and strain rates. Fracture patterns changed mainly at a temperature of 200C. Uniform and total elongation of multilayered sheet increased to values greater than those of each material when deformed at 250C. The limiting drawing ratio (LDR) was obtained using a circular cup deep drawing test to measure the formability of the multilayered sheet. A maximum value for the LDR of about 2 was achieved at 250C, which is the appropriate forming temperature for the Mg alloy. Fracture patterns on a circular cup and thickness of formed part were predicted by a rigid-viscoplastic FEM analysis. Two kinds of modeling techniques were used to simulate deep drawing process of multilayered sheet. A single-layer FE-model, which combines the three different layers into a macroscopic single layer, predicted well the thickness distribution of the drawn cup. In contrast, the location and the time of fracture were estimated better with a multi-layer FE model, which used different material properties for each of the three layers.

Study for Synthesis and Properties of Polyurethane Based on Polyester Polyol with Varying Hydroxyl Values for Automotive Pre-painted Metal Sheet Applications (자동차 선도장 강판용 폴리에스테르 폴리올 기반 폴리우레탄의 합성과 물성에 대한 연구)

  • Kang, Choong Yeol;Lee, Jae Young;Noh, Seung Man;Nam, Joon Hyun;Park, Jong Myung;Jung, Hyun Wook;Yu, Sang Soo
    • Journal of Adhesion and Interface
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    • v.12 no.1
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    • pp.34-42
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    • 2011
  • The roll coating process is well-known for completely replacement coating system with an existing wet paint process for automotive which has low productivity and is not environment-friendly process. It is very important to evaluate the curing behavior, corrosion resistance and processing property as well as rheological behavior in order to realize a film flexibility and hardness simultaneously. In this study, we have synthesized the polyester resin modified with hydroxyl values and molecular weight to apply the pre-painted system, and then evaluated the curing behavior, deep drawing, tensile strength and rheological properties. It was observed that N-0375-40 of 40 (mg KOH/mol) hydroxyl values showed the most suitable for flexibility, film hardness, and curing behavior.

Influence of the Charged Explosives on the Steel Plate Cutting Performance in Bent-Shaped Charge Holder Blasting (드로잉 가공 성형폭약용기를 이용한 강재구조 발파공법에서 사용폭약의 종류가 절단성능에 미치는 영향)

  • Kim, Gyeong-Gyu;Park, Hoon;Min, Gyeong-Jo;Shin, Chan-Hwi;Cho, Sang-Ho
    • Explosives and Blasting
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    • v.39 no.1
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    • pp.1-9
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    • 2021
  • As the national economic growth and the rapid increase in industrial structures are aging, the demand for removing steel structures is increasing, and research on improving the penetration performance of the linear shape charge explosives. In the study, numerical analyses were performed on the effect of the type of explosive used in the self-made shape charging container and the initiation method on the cutting performance of the steel plate and the effect on the shaped explosive installed close to it. ANSYS LS-DYNA, which can analyze the large deformation problem of materials due to explosion, was used, and an ALE(Arbitrary-Lagrange-Eulerian) model was applied that enables interlocking analysis of gases, liquids, and solid.