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상용 CAM시스템을 활용한 금형 형상부(CORE/CAVITY)의 가공에 관한 연구
한규택,Han, Kyu-Taek 한국기계가공학회 2003 한국기계가공학회지 Vol.2 No.1
The purpose of the present paper is to investigate about the machining of profile (core/cavity) of mold die using the commercial CAM system. Recently the requirement of the light weight and high performance of automobiles has Increased. The weight of the automobile is very important in the viewpoint of the fuel and traveling performance. The optimal design technique, material technique, the process design for parts and specially, die machining technique need to be developed for increasing productivity and reducing production time of the automobile parts. In this study, the effect of machining condition on precision of die profile is investigated by experimental observation and analysis. The results will be reflected for development of the precision die of the automobile.
다구찌 방법을 이용한 폴리아미드 성형품의 충전 불균형에 관한 연구
한규택,정영득,구양,김병탁,김형제,한성렬,Han, Kyu-Taek,Jeong, Yeong-Deug,Goo, Yang,Kim, Byung-Tak,Kim, Hyung-Je,Han, Seong-Ryul 한국기계가공학회 2004 한국기계가공학회지 Vol.3 No.4
Plastics is used to produce precise parts with an inclusion of a reinforcement material such as glass fiber or carbon fiber to improve the dimension accuracy. The plastic goods can be produced with inaccurate dimensions, low mechanical strength, or residual stress due to the over packing of cavity inside, if the filling balance of melt resin is not accomplished. To overcome this problem, it is necessary to design the runner system with the geometrical balance at the mold design stage. However, even if the balanced runner system is achieved, a severe filling imbalance is observed practically in a multi-cavity mold. In this study, experiments were performed with Taguchi method to achieve the filling balance in multi-cavity mold with a symmetric runner system, by the use of pure PA and PA with glass fiber 33%. The experimental results were investigated to understand the effect of related molding factors on the filling imbalance for two resins.
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(Kyu-Taek Han) 한국기계가공학회 2013 한국기계가공학회지 Vol.12 No.3
This study focused on the development on functional shoe apparatus so that the appropriate impact can be applied to the feet in order to improve the density of mineral bone at lower limbs. The model with structure proposed in this study had an effective stress about 20 to 100% higher by comparing that of the model without it among most of 15 bone extraction points. Though there is a limitation that the finite element analysis data from the human body model are not the value of mineral bone densities by measuring directly but the effective bone stresses against impact, the proposed structure is designed to influence the increase of bone mass and improve the density of mineral bone by effecting the improvement of the density of mineral bone actually.
3D 프린팅시스템과 CAM시스템을 활용한 금형가공에 관한 연구
한규택(Kyu-Taek Han),박지훈(Ji-Hoon Park),구배성(Bae-Sung Gu) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.5
The purpose of this study is to find optimum machining conditions to improve the quality of die using the CAD/CAM system(Power Shape & Power Mill) and 3D printing. In this paper, at first, modelling a model using Power Shape and printing the model using 3D printing system(BFB-3000). Second, create the tool path and generate NC codes using Power Mill. And then cut the A16061 by CNC machine (NBS-2025). Finally, measure the surface roughness using measuring instrument(SJ-310). Through this study, the optimal machining condition can be obtained.
한규택(Kyu-Taek Han) 한국기계가공학회 2018 한국기계가공학회지 Vol.17 No.1
A pressure vessel consists of an inner tank and the outer tank; the material of the inner tank is austenite stainless steel, and the outer tank is general carbon steel. As the storage amount increase, the size of the inner tank for LNG also increases, which eventually increases the weight of the LNG storage tank. The Cold Stretch method can transport and store the LNG in a larger amount than the conventional pressure container, and the weight of the pressure vessel can also be reduced at 50 70% due to the reduction of the thickness, which is excellent from an economic and energy consumption perspective. Although the Cold Stretch method has these advantages, the domestic situation has not developed any related legislation. In this study, the actual production of pressure vessels using the Cold Stretch method will be processed and the volume expansion after the Cold Stretch will be checked and compared with the mechanical properties.
Research on the Mold Design of Motor Housing using Die Casting Process
Kyu-Taek Han(한규택) 한국기계가공학회 2015 한국기계가공학회지 Vol.14 No.5
In this paper, research on the mold design of motor housing produced by the HPDC process was conducted using computer simulations and experiments. Recently, automobile parts have been required to be light and have high strength. The die casting process was used to manufacture automotive motor housings. In the die casting process, the control of casting defects is very important. However, it has usually depended on the experience of the foundry engineer. For the analysis of the manufacturing process of motor housing, the finite element method is applied. Through the simulations using commercial software, the filling pattern and product defects could be confirmed. The analysis results obtained from the filling behavior of the casting process agreed with the experimental results. The computer simulation results of filling behavior were reflected in the optimal mold design of motor housing.
Analysis of Bulk Metal Forming Process by Reproducing Kernel Particle Method
Kyu-Taek Han(한규택) 한국기계가공학회 2009 한국기계가공학회지 Vol.8 No.3
The finite element analysis of metal forming processes often fails because of severe mesh distortion at large deformation. As the concept of meshless methods, only nodal point data are used for modeling and solving. As the main feature of these methods, the domain of the problem is represented by a set of nodes, and a finite element mesh is unnecessary. This computational methods reduces time-consuming model generation and refinement effort. It provides a higher rate of convergence than the conventional finite element methods. The displacement shape functions are constructed by the reproducing kernel approximation that satisfies consistency conditions. In this research, A meshless method approach based on the reproducing kernel particle method (RKPM) is applied with metal forming analysis. Numerical examples are analyzed to verify the performance of meshless method for metal forming analysis.