• 대한기계학회논문집A
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• 제21권7호
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• pp.1141-1148
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• 1997

In the stamping industry the blank shape to be stamped into a designed shape has been conventionally determined from the try out process by the press engineers. The work needs a lot of time and thus leads a loss of productivity. In this study boundary element method for 2-dimensional potential problem was used to design optimum blank shapes for irregular press forming. Here we assumed that the blank is controlled by blank holder only and material flow at blank holder was under potential flow. The developed PC code for designing the optimum blank shape shows that the blank shapes for optimal drawing can be calculated within a few minute in pentium PC and the calculated shapes agree well with the experiments. However the application of this method is constrained only to the pressed product with flat bottom.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 1999년도 춘계학술대회논문집
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• pp.45-48
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• 1999

A program for initial blank design in sheet forming which contains the capabilities of forward loading simulation by the finite element method and backward tracking simulation has been developed and proved the effectiveness by applying to a square cup stamping process. In the blank design of square cup stamping the backward tracing program can produce an optimum blank configuration which forms a sound net-shape cup produce without machining after forming. Another general application appears in the blank design of a cup stamping with protruding flanges one of typical automobile components. The blank configurations derived by backward tracing simulation have been confirmed by a series of loading simulations. The approach for decision of an initial blank configuration presented in this study will be a milestone in fields of sheet forming process design.

• 한국융합학회논문지
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• 제8권6호
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• pp.153-162
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• 2017

이 논문은 중국과 일본의 상이한 미적, 철학적 차이의 이해와 융합을 기반으로 그래픽 디자인 분야에서 여백을 통한 새로운 표현 창출을 위한 방법에 대해 논했다. 그래픽 디자인에서 동양의 특징적인 여백을 표현하는 것은 디자인의 예술적 표현과 문화적 의미를 풍부하게 하고 디자인의 창작의 가능성을 높을 수 있다. 이 연구에서는 먼저, 중국과 일본의 미술 및 디자인에서의 여백에 대한 인식과정과 표현과정을 중국의 전통회화의 철학과 일본의 현대 그래픽 디자인의 방법이 적용된 포스터 디자인을 통해 비교∙분석한다. 이를 기반으로 포스터 디자인에서 여백을 통해 중국 현대 그래픽 디자인의 새로운 접근방법으로써 융합의 개념을 적용해 그래픽 작업에서의 표현의 가능성을 확장한다. 또한, 여백에 대한 융합적 개념에 의한 표현 창출은 자신의 작품에 새로운 가능성을 제공한다.

• 소성∙가공
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• 제6권5호
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• pp.400-407
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• 1997

Geometric mapping technique has been used to find the shape of initial blank for sheet forming. The method was chosen because of its simplicity and numerical efficiency. Error in blank shape were measured along deformation path by FE analysis of forming. Blank shape was modified by volume additionaddition/Subtractiontraction method with taking with taking into account of deformation path. Modified blank shape shows an acceptable result, showing the current method can be an useful tool for predicting blank shape in the practical application. More test will be done to verify the validity of the method.

• 소성∙가공
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• 제10권4호
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• pp.283-293
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• 2001

Laser welded tailored blanks(TB) are increasingly used in automotive parts. Among these, TB side panel has forming difficulties in stretch flanging areas such as front and center pillar lower region. To avoid splits in the stretch flanging areas, Proper design of blank shape and drawbeads are essential In this study, the forming simulaton is carried out to investigate the influences of blank shape and drawbeads on stretch flange formability of different thickness TB. And an optimization procedure including the effects of both the blank design and drawbeads is presented. The optimization procedure proposed in this study is expected to be effectively used in blank and die design of TB side panel.

• 소성∙가공
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• 제9권6호
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• pp.598-603
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• 2000

In order to improve trial-and-error based conventional practices for optimizing forming processes, a direct design method to guide iterative design practices, called the ideal forming theory, has been previously developed. In the theory, material elements are required to deform following the minimum Plastic work Path. The theory can be used to determine the ideal initial blank shape needed to best achieve a specified final shape while resulting in optimum strain distributions. In this work, the direct design method based on the ideal forming theory was applied to design initial design shape for VCR deck chassis. Based on the solution of the ideal forming theory, FEM analysis was utilized to evaluate an optimum blank shape to be formed without tearing. Simulation results are in good agreement with experimental data. It was shown that the proposed sequential design procedure based on direct design method and FEM can be successfully applied to optimize the die design Procedure of sheet metal forming processes.

• 커뮤니케이션디자인학연구
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• 제59권
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• pp.114-127
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• 2017

현재 여백에 대한 연구는 주로 미술학, 건축학 논저에서 찾아볼 수 있으며, 영상 학술 연구 중에서는 비교적 적은편이다. 그러나 여백은 의미를 표현하는 수단으로서 영상 작품에 독특한 예술적 매력을 부여하며, 영화 예술에 있어 여백 형식의 발전은 능동적인 미학적 영향을 미친다. 영상작품 속 여백사상에 대한 깊이 있는 연구를 위해 본문에서는 먼저 '여백'의 정의에 대해서 논의하고 여백이 생겨난 역사와 사회적 기원을 거슬러 올라가서 여백과 도교(道敎)학설의 관계와 중국화 속에서의 응용을 살펴볼 것이다. 다음은 도교에서 말하는 '여백' 사상을 결합하여 영상예술 속에서의 여백의 기능과 예술적 표현, 그리고 사람들의 사상승화에 미친 영향 등을 분석할 것이다. 여백은 하나의 의미표현 수단으로서 미적 가치를 실현함과 동시에 대중의 영화예술 지각능력을 강화한다. 그러하기에 여백이라는 유구한 미학 사상은 새로운 시대, 새로운 영역에서 지속적인 생기를 발산하게 될 것이다.

• 소성∙가공
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• 제27권1호
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• pp.18-27
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• 2018

As one of the functional metal parts in steam turbine diaphragm assembly, the hollow-partitioned turbine nozzle (stator) has large and thick geometries, as well as an asymmetric configuration. Therefore it is hard to support a metal blank in the die cavity. To ease this situation and control posture and position of metal blank (workpiece), a blank support structure is newly introduced. The blank support structure is basically composed of enlarged arms from the blank, guide pins and linear bearings. It can help to control the intermediate blank without a critical sliding phenomenon. The operation mechanism of this blank support structure, during thick plate forming for the hollow-partitioned turbine nozzle stator, is first evaluated. A series of FEM-based numerical simulations, with respect to the width of the guide arm as geometric design parameters, are carried out to investigate its applicable range. As the results, it is observed the blank support structure for this thick plate forming can guide the workpiece to have stable posture during the plate forming process.

• 대한기계학회논문집A
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• 제24권1호
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• pp.79-86
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• 2000

In this study, a method of optimal blank design using the sensitivity analysis has been proposed. To get sensitivity a well-known commercial code PAM-STAMP has been used. In order to verify this method, formings of square cup, clover shaped cup and L shaped cup have been chosen as the examples. With the predicted optimal blank both computer simulation and experiment are performed. Excellent agreements are recognized between the numerical results and the target contour shapes. Through the investigation, the proposed systematic method of optimal blank design is found to be effective in the design of the deep drawing process.

• 소성∙가공
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• 제13권1호
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• pp.90-101
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• 2004

An inverse mosaic method has been proposed to generate an initial blank shape from the final product shape. Differently from the geometric mapping method, the method can handle triangular patches. However, the generated blank shape is strongly dependent on the order of determination of nodes. In order to compensate the dependency error smoothing technique has been also developed. Although the accuracy has been improved greatly compared with the geometrical mapping method, the method has limitation, due to the no incorporation of plasticity theory. Even though the accuracy of the radius vector method is already proved. the method requires initial guess to start the method. In order to compromise the limitation of the present method and the radius vector method, the method has been connected to the radius vector method. The efficiency of the present optimal blank design method has been verified with some chosen examples.