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변형율속도 경화를 고려한 구성방정식을 응용한 성형한계선도에 관한 연구
한규택 釜山工業大學校 1993 論文集 Vol.35 No.-
The purpose of this study is to consider the effects of strain rate on the stress-strain behavior of sheet metal at instability. The results and conclusions obtained as follows : 1. As the strain rate increases, the fracture pressure increases and the polar height at fracture dec-reases. 2. The effect of strain rate on forming limit diagram produces a general lowering of the diagram with increasing strain rate but changes according to matgerials and strain paths. 3. The forming limit diagram predicted by Swift instability theory is comparatively inconsistent with the experimental result at high strain rates, because there is inevitable gap between them.
한규택 한국기계가공학회 2016 한국기계가공학회지 Vol.15 No.4
In this paper, a model to develop the forming process for a turbine seal is suggested. Additionally, the numerical approach for the shape design of the turbine seal is examined. Because of the thinness of the turbine seal, the seal is easily fractured in the manufacturing process. The main factors of the seal manufacturing consist of the addendum angle and dedendum angle, the fillet on the addendum face, the number of gear teeth, the sheet’s initial location and the gear’s initial location, the rake, and the vertical clearance. The structure and shape of the seal are modeled using the commercial 3D mechanical design program CATIA (V5/R20). Additionally, the rolling process to manufacture the turbine seal is analyzed using DEFORMTM-3D(V11),commercialforminganalysissoftwarethatruns on a PC workstation. This study focused on the shape design of the turbine seal. Through this research, the main factors for making the turbine seal for an airplane turbine engine can be obtained. The study results are reflected in the shape design for the turbine seal.
한규택,Han, Kyu-Taek 한국금형공학회 2013 한국금형공학회지 Vol.7 No.1
The finite element method(FEM) presents some limitations when the mesh becomes highly distorted. For analysis of metal forming processes with large deformation, the conventional finite element method usually requires several remeshing operations due to severe mesh distortion. The new computational method developed in the recent years, usually designated by meshfree method, offers an attractive approach to avoid those time-consuming remeshing efforts. This new method uses a set of points to represent the problem domain with no need of an additional mesh. Also this new generation of computational method provides a higher rate of convergence than that of the conventional finite element methods. One of the promising applications of meshfree methods is the adaptive refinement for problems having multi-scale nature. In this study, an adaptive node generation procedure is proposed and also to illustrate the efficiency of proposed method, several numerical examples are presented.
한규택 釜慶大學校 1998 釜慶大學校 論文集 Vol.3 No.2
The fine blanking is a process of pressworking which makes possible to produce thich sheet metal parts of finished sheared surface and close dimensional accuracy over whole material thickness in single blanking operation. Fineblanked parts in general are characterized by theri cleanly sheared surface over the whole stock thickness and accurate size for the specific functions. The fine blanking technology is urgently needed to remove secondary operations which are necessary in conventional blanking operation and cost reduction. In this study, the effect of material texture and vee-ring on the product is investigated by experimental observation and analysis.