• Title/Summary/Keyword: Drawing

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Prediction of Drawing Load in the Shape Drawing Process (이형인발공정 하중예측에 관한 연구)

  • Lee, T.K.;Lee, C.J.;Lee, S.K.;Kim, B.M.
    • Transactions of Materials Processing
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    • v.18 no.4
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    • pp.323-328
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    • 2009
  • The prediction of drawing load is very important in the drawing process. However, it is not easy to calculate the drawing load for the shape drawing process through a theoretical model because of a complex arbitrary final cross section shape. The purpose of this study is to predict drawing load in shape drawing process. The cross section of product is divided with small angle as much as similar with fan-shape. The drawing load of each section was calculated by theoretical model of round to round drawing process. And the shape drawing load was determined by summation of drawing load of each section. The effectiveness of the proposed method was verified through the FE analysis and shape drawing experiment. It had a good agreement between proposed method, FE analysis and experiment within about 3% errors.

Landscape Drawing as a Text: Practical and Theoretical Approach (텍스트로서의 조경드로잉 - 읽기의 틀과 실제 -)

  • 이광빈;조정송
    • Journal of the Korean Institute of Landscape Architecture
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    • v.27 no.1
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    • pp.54-63
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    • 1999
  • The Landscape drawing is used as main media in landscape design process like the language in daily life for human. Designers input many intentions and meaningful words in design process through landscape drawing. The common purpose of landscape drawing is to represent reality effectively, even though it has variable visual forms and materiality. The representation in landscape drawing in metaphorical as well as visual and functional. But current tendency is inclined to use landscape drawing in a functional aspect for visual representation and the landscape drawing is utilized straight-forwardly rather than metaphorically for clear communication. Such recognition on landscape drawing results from the difficulty to accept the symbolic aspect of the drawing. The difficulty makes the utilization and the interpretation of landscape drawing stay at conventional level in following visible factors. For the sake of solving the difficulty this study considers landscape drawing as the text that contains readable objects and symbolic words. This study presents layer-methods for reading a landscape drawing as a text; situational and contextural reading, iconological reading and reading the subject of drawing.

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A Study on Reduction Distribution in Tube Drawing Process (튜브 인발공정시 압하량 배분에 관한 연구)

  • Lee D. H.;Kim D. W.;Kim D. H.;Moon Y. H.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.35-38
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    • 2004
  • In general, tube drawing process is composed of two steps, so called first drawing and second drawing. Drawing cracks are mainly occurred during the 2nd drawing process due to the improper drawing process. In order to analyze the reduction distribution in successive two-step drawing process, tube drawing process was simulated by finite element method. From the finite element analysis, the balance between first and second reduction is proved to be important factor to prevent drawing cracks. Hence the numerical expression was developed for tube drawing process to distribute even strain and criteria curves that can predict the safe drawing region were also proposed using this numerical formula.

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Process Design of Multi-pass Shape Drawing Considering the Drawing Stress (인발응력을 고려한 다단 형상인발 공정설계)

  • Kim, S.M.;Lee, S.K.;Lee, C.J.;Kim, B.M.;Jeong, M.S.;Kim, B.M.
    • Transactions of Materials Processing
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    • v.21 no.4
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    • pp.265-270
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    • 2012
  • In this study, a process design method for the multi-pass shape drawing is proposed with consideration of the drawing stress. First, the shape drawing load was calculated to evaluate the shape drawing stress, and the intermediate die shape was determined by using an electric field analysis and the average reduction ratio. In order to evaluate whether material yielding occurs at the die exit, the drawing stress was determined by using the calculated shape drawing load. Finally, FE-analysis and shape drawing experiments were conducted to validate the design of the multi-pass shape drawing process. From the results of the FE-analysis and shape drawing experiments, it was possible to produce a sound shape drawn product with the designed process. The dimensional tolerances of the product were within the allowable tolerances.

Design and Manufacture of Ultrasonic Vibration Drawing Tool (유한요소해석을 이용한 초음파 진동 인발기 설계 및 제작)

  • Lee, K.H.;Kim, B.M.
    • Transactions of Materials Processing
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    • v.19 no.6
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    • pp.363-371
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    • 2010
  • In ultrasonic vibration drawing, the drawing forces can be reduced by applying ultrasonically oscillating dies. Ultrasonic vibration drawing has been considered as a means of accommodating high-level drawing processes such as shaped wire, ultrafine wire, and the wire drawing operation in semidry or dry condition. Prior studies were attempted to analyze the mechanism of improved drawing performances, such as reduced drawing force and improved lubrication characteristic. However, researches on design rule for ultrasonic vibration drawing system are not yet carried out. The principal objectives of this work are to design a set of tooling capable to superimpose the oscillations and to observe by experiments the influence of the ultrasonic oscillations on the wire drawing.

Drawing Strain Distribution Model for the Two-Pass Drawing Process (2단 튜브인발 공정시 인발변형률 배분모델 재발)

  • Lee D. H;Chung U. C;Moon Y. H
    • Transactions of Materials Processing
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    • v.13 no.8
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    • pp.671-677
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    • 2004
  • For the large reduction in tube cross section, the tube drawing process is usually performed by two successive passes, so called first drawing and second drawing. In multi-pass drawing process, the reduction balance is important to prevent drawing cracks. Therefore in this study, the model for uniform reduction distribution in two-pass drawing process has been developed on the basis of cross sectional variation of drawn tube. For the given product geometry the model provides optimal diameter and thickness that can evenly distribute drawing reductions. The capability of model is well confirmed by finite element analysis of tube drawing process. Criteria curves at various limit strains to determine whether the drawn tube would fail during drawing process are also proposed by using newly developed model.

Experimental study on the severe deep drawing for complex cylindrical housing of STS 305 stainless steel (스테인리스 강 STS305의 디프 드로잉 가공에 관한 실험적 연구)

  • Kim, Doo-Hwan
    • Transactions of Materials Processing
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    • v.7 no.5
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    • pp.439-444
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    • 1998
  • Recently many automotive parts have been made with stainless steels by deep drawing processes, But there are various problems occurred in deep drawing works of stainless steels compared with low carbon steels. For the severe deep drawing of complex cylindrical housing optimum process planning is required to eliminate intermediate annealing improve shape accuracy and maintain surface integrity without drawing defects such as tears wrinkles and scratches or galling. Therefore in this study a sample process planning of the severe of the severe deep drawing process is applied to a complex cylindrical housing needed for a 6 multi-stepped deep drawing of type STS 305 . A series of experiments are performed to investigate optimum process variables such as drawing rate radius and clearance. Through experiments the variations of the thickness strain distribution and hardness distribution in each drawing step are observed. Also the effects of other factors on formability such as drawing oil, blank holding force and die geometry are examined and discussed.

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Implementation of Digital Light Drawing System based on Stereo Vision (스테레오 비전 기반 Light Drawing 시스템 구현)

  • Park, Won-Bae;Park, Chang-Bum;Paik, Doo-Won
    • The Journal of the Korea Contents Association
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    • v.10 no.2
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    • pp.130-137
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    • 2010
  • Light Drawing is a photographic technique which exposures are made at night or in a darkened room usually by moving a hand-held light source[1]. Due to the limitations of equipment and environment, users having difficulty in drawing a picture in 3D space. If user take a light drawing, they need a camera that have function and darkened environment. Alternative solution is that we can make a light drawing picture by using the computer drawing tool as in Photoshop. Nevertheless, this solution will let the User lose their interest in drawing because this solution cannot synchronize between the real action of human hand motion and the electronic input devices such as mouse and keyboard. This paper proposed a digital content that can make light drawing easier. We used a digital content that will facility Light Drawing easier. We can measure the light spot position by using the stereo camera. Based on the measured position of the light spot, we reproduce light drawing in virtual space by using drawing effect method.

Process Design for Multi-pass Profile Drawing using Round Materials (원형소재를 이용한 프로파일 다단 형상인발 공정설계)

  • Lee, I. K.;Choi, C. Y.;Lee, S. K.;Jeong, M. S.;Lee, J. W.;Kim, D. H.;Cho, Y. J.;Kim, B. M.
    • Transactions of Materials Processing
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    • v.24 no.4
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    • pp.234-240
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    • 2015
  • Multi-pass shape drawing is very important to produce steel profiles in round samples. In the current study, a process design system is developed for a multi-pass shape drawing. In general, the number of passes for a multi-pass shape drawing is 2 to 3 when the reduction ratio, drawing stress, and productivity are considered. Therefore, calculating the drawing stress and designing the intermediated die shapes are very important. In order to calculate the drawing stress, a shape drawing load prediction method is proposed using a general axisymmetric drawing load prediction model. An intermediate die shape design method is proposed using the initial and the final product shapes. Based on this analysis, a process design system is developed for multi-pass shape drawing for steel profiles. The system works with AutoCAD. The system was applied to design a shape drawing of a spline.

A Study on the process planning of Deep drawing using personal computer (퍼스널 컴퓨터에 의한 디이프드로잉 공정설계의 전산화에 관한 연구 (I))

  • Choi, Jae-Chan;Jin, In-Tai
    • Journal of the Korean Society for Precision Engineering
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    • v.5 no.3
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    • pp.31-42
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    • 1988
  • This paper describes a computer aided process planning system called "Deep-Drawing", "Deep-Drawing" is designed for the drawing sequence of cylindrical and rectangular cups with or without taper and flange. The computer program has written in BASIC language with personal computer. Design Rules for process planning are formulated from process limitation, plasticity theory and experimental results including the know-how of many manufacturing factories. "Deep-Drawing" Capabilities include the analysis of drawing sequence by the determination of optimal drawing ratio, the determination of intermediate shape, dimensions, punch and die radius etc., the calculation of drawing loads and blank holder force to perform each drawing step, and the graphic outputs for the operation sheet.tputs for the operation sheet.

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