• Design & Manufacturing
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• 제1권1호
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• pp.33-37
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• 2007

In recent, the demand of high-productivity injection mold increases because of the growth of international packaging market. The increase of productivity leads to the large-sized injection molding machine and peripheral devices. For solving this problem, the stack mold which is based on the existing machine and device is studied in advanced countries actively. In this study, as the preliminary research of stack mold development, the stack mold which has 2 Level ${\times}4$ Cavity is designed and manufactured. Besides, the motion and structural analysis are executed to verify the stability of developed stack mold.

• 한국산학기술학회논문지
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• 제7권4호
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• pp.554-558
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• 2006

금형산업체의 직무능력 요구에 적응하는 산업현장과 연계된 실무능력 향상을 위한 대학의 금형기술 교육이 필요하다. 특히, 취업 후 회사의 사전교육 없이 직능별 업무에 투입 시킬 수 있는 창의력 있는 우수한 전문기술인을 양성하여 교육의 낭비적 요소를 제거하고 산업체 및 국가의 기술경쟁력을 강화 시키며 학생은 인력수요자인 산업체로부터 요구하는 현장실무에 접근성 높은 교육을 받아 취업이 보장되어야 한다. 또한 산업체는 전문인력 수급의 어려움을 해소 시켜주기 바라고 있다. 이상의 요구를 충족시킬 목적으로 금형산업체와 연계된 금형설계공학전공의 교육과정 개발을 수행하였다.

• Design & Manufacturing
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• 제10권3호
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• pp.20-24
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• 2016

Foaming is a step of forming by the ratio of the internal combustion chamber in a state where the in flow of the material is suppressed, if the diameter is small and a high to a crack generated on the molding is not possible. The present study, we studied using as part experiments for forming the circular shape of the forming height of 10 mm without the occurrence of cracks, results preformed primary, the need to set the height of the forming than the height of the product, preformed secondary. It was able to increase the height of the molded product with less than the height of the next step to be carried out compression processing to create a small comer of the desired shape. In addition, it was found that on a great influence on the quality of the final quality on the final molding of the primary preformed, secondary.

• 한국정밀공학회지
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• 제29권2호
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• pp.185-192
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• 2012

The paper presents the development of a cooling circuit design system that automatically creates 3D cooling circuit on a given section plane conforming to design specifications, generates 3D solid model of cooling line segments defined on a 2D sketch plane, and verifies interference of 3D cooling channel with the molding die surface. The system was developed mainly for designing plastic injection molding die of vehicular lamp, which helps the mold designer to rapidly construct cooling circuits but also reduce designer's unintended mistakes by conforming to the dimensional design specifications. It is used by an injection molding die manufacturing company in Korea, and reported approximately 20% reduction of cooling channel design time.

• 산업경영시스템학회지
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• 제38권1호
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• pp.44-51
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• 2015

When manufacturing die casting mold, generally, the casting layout design should be considered based on the relations of injection system, casting condition, gate system, and cooling system. According to the various relations of the conditions, the location of product defects was differentiated. High-qualified products can be manufactured as those defects are controlled by the proper modifications of die casting mold with keeping the same conditions. In this research, Computer Aided Engineering (CAE) simulation was performed with the several layout designs in order to optimize the casting layout design of an automotive part (Housing). In order to apply them into the production die-casting mold, the simulation results were analyzed and compared carefully. With the filling process, internal porosities caused by air entrapments were predicted and also compared with the modification of the gate system and overflow. With the solidification analysis, internal porosities occurring during the solidification process were predicted and also compared with the modified gate system. The simulation results were also applied into the production die-casting mold in order to compare the results and verify them with the real casting samples.

• Design & Manufacturing
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• 제13권1호
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• pp.25-30
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• 2019

This paper presents the design strategy for the optimal RTM molds of Carbon Fiber Reinforced Plastic (CFRP) by carbon fiber draping and resin flow simulation. First, the mold shape and molding condition were determined considering the undercut and die face of the product in the draping simulation, which made the preliminary shape of the product by compressing the carbon fiber. After that, the diffusion behavior during the injection of resin in the mold was predicted by the resin flow simulation. Finally, the optimal mold shape was designed by selecting the locations of resin injection port and vent based on total results of simulations. In this paper, the mold of automotive side mirror case was selected as the representative product. Also, the actual mold was manufactured based on the simulation design to confirm the practicality of it. This study is expected to contribute to the industry as a technology to improve the reliability and productivity of CFRP producted by RTM process.

• Design & Manufacturing
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• 제2권3호
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• pp.16-21
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• 2008

In recent, the demands of household cases and disposable products is increased significantly because a living standard of newly-emerging nations was risen. Therefore, multi-cavity mold and stack mold for the realization of high-productivity have been researched in forefront nations. In this paper, CAE analysis for minimizing the mold core deformation was performed. Finally, 64 cavities injection mold for molding cap which has the insert-type core was fabricated according to the result of CAE analysis.

• 한국기계가공학회지
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• 제12권3호
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• pp.7-12
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• 2013

In Die casting process, the problem of die degradation is often issued. In oder to increase of die life the material degradation of die steel was investigated using test core pins. Three test core pins were positioned in front of the gate entry and observed washout and soldering resistance during Mg die casting process. The test parameters are set as different commercial die materials, coatings condition and hardness of die surface. Usign 220t magnesium die casting machine was employed to cast AZ91 magnesium alloys. After 150 shots, macroscopic observation of die surface was carried out. Additional 50 cycles later, test pins were chemically cleaned with 5% HCl aqueous solution to find out the existence of washout and soldering layers. Microstructural characterization of die surface and the die roughness measurement were performed together. Computational simulation using AnyCasting program was also beneficial to correlate the extent of die damage with the position of test pin inside die cavity. As results, the optimal combination of die steel with productive coating as well as its hardness was drawn out. it will be helpful to decide the material and condition considering increasing of tool life.

• Design & Manufacturing
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• 제2권4호
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• pp.16-23
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• 2008

This paper describes $R_p,\;R_d,\;R_c,\;R_{cp},\;R_{cd}$ for design and manufacture of die by comparing the results. Results of this study could be reduced from three processes to two processes and drawing can be conducted using one die set by modifying structure of the punch head and die plate. Oil canning phenomenon can be prevented when circle blanking or ellipse blanking in blanking drawing. $R_c$, the important factor of drawing process was able to evaluate properly in designing of product.

• 한국금형공학회:학술대회논문집
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• 한국금형공학회 2008년도 하계 학술대회
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• pp.23-26
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• 2008

In order to examine the deformation characteristics of Al circular pipe underthe biaxial compression, the horizontal biaxial compression die for the experiment was manufactured. From this, in the various compressive strain rate (1 mm/min. ${\sim}$ 400 mm/min.)conditions, the circular pipes, which were made by Al materials, were investigated based on the properties change of cross section area, punch load and deformation behavior. The tensile and compressive strains were evaluated from micro Vickers hardness tester. From these results, the punch load and deformation characteristic of Al circular pipes were highly changed in the compressive strain rate about 200 mm/min. The Al circular pipes had the tendency that the punch load decreased with increasing the compressive strain rate. In addition, following as the change of the shape and position of neutral axis due to the deformation proceeding of the circular pipe, the special point of the internal circular pipe at maximum load showed the maximum deformation strain and the maximum measured hardness value. The CAE (computer aided engineering) simulation using Deform-2D program was performed on the circular pipe in order to know and verify the exact compressive deformation behavior. From these results, the experimentally measured results were reasonably in good agreement with the simulation results.