• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2006년도 추계학술대회 논문집
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• pp.391-392
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• 2006

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2002년도 금형가공 심포지엄
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• pp.180-186
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• 2002

The simulated die-casting process in which the traditional plaster casting process is combined with Rapid Prototyping technology is being used to produce Al, Mg, and Zn die-casting prototypes. Unlike in the die-casting process, molten metal in the conventional plaster casting process is fed via a gravity pour into a mold and the mold does not cool as quickly as a die-casting mold. The plaster castings have much larger and grosser grain structure as compared as the die-castings and the thin walls of the plaster mold cavity may not be completely fillet Because of lower mechanical properties induced by the large grain structure and incomplete Idling, the conventional plaster casting process is not suitable for the trial die-casting Process. In this work, an enhanced trial die-casting process has been developed in which molten metal in the plaster mold cavity is vibrated and pressurized simultaneously. Patterns for the casting are made by Rapid Prototyping technologies and then plaster molds, which have runner system, are made using these patterns. Imparted pressurized vibration to molten metal has made grain structure of castings much finer and improved fluidity of the molten metal enough to obtain complete filling at thin walls which can not be filled in the conventional plaster casting process.

• 대한공업교육학회지
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• 제41권1호
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• pp.1-21
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• 2016

이 연구의 목적은 DACUM 직무 분석기법을 활용하여 특성화고 산학일체형 도제교육을 위한 금형제작원 직무를 분석하는 것이다. 연구의 내용은 금형제작원의 직무를 구성하는 임무와 수행 작업을 도출하여 순서를 매기기한 후, 수행 작업별 중요도, 난이도, 빈도를 정하고 산업체에 취업할 당시 수행할 수 있는 최소한의 작업을 구분하여 제시하는 것이다. 최종적으로 직무분석 결과를 토대로 산학일체형 도제학교의 금형제작원 DACUM 차트를 개발하였다. DACUM 직무 분석을 위한 DACUM 위원회는 Level-I 라이센스를 취득한 DACUM 분석가 1명, 5년 이상 경력을 가진 데이컴 위원 9명, 서기 1명, 실무자 1명으로 구성하여 직무분석을 수행하였다. 연구 결과는 다음과 같다. 첫째, 산학일체형 도제학교의 금형제작원이란 설계된 도면에 따라 원자재와 부자재를 사용하여 가공기계와 공구로써 금형을 사상, 가공, 조립하는 자로 정의하였다. 둘째, 금형제작원의 직무 영역은 12개의 임무(duties)와 86개의 수행 작업(tasks)이 도출되었다. 12개 임무(금형 설계 검토, 원자 부자재 입고 확인, 사출 금형 가공, 가공품 완성 여부 확인, 사출 금형 래핑 습합, 조립 시 사출, 프레스 금형 가공, 프레스 금형 사상 조립, 다이 스포팅, 금형 트라이 아웃, 품질 육성, 금형 출하) 중에서 가장 많은 수행 작업을 도출한 임무는 '프레스 금형 사상 조립'으로 9개의 수행 작업이 확인되었다. 셋째, 각 작업마다 중요도, 난이도 및 빈도를 정도에 따라 각각 높음(A), 보통(B), 낮음(C)으로 구분하고, 전문가들의 합의를 통해 입직 초기에 갖추어야 할 핵심 능력인지의 여부를 구분하였다. 넷째, 직무 분석 결과를 토대로 산학일체형 도제학교의 금형제작원 DACUM 직무분석 차트를 개발하였다. 또한 금형제작원 직무에 종사하면서 필요한 일반 지식과 능력, 사용되는 공구, 기계, 자재 및 소모품의 목록을 끌어내고, 금형제작원의 장래 직업의 전망과 특성을 제시하였다.

• Design & Manufacturing
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• 제13권2호
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• pp.49-53
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• 2019

The temperature distribution and lifetime of molds were predicted by computer simulation analysis with various spraying and blowing process of high pressure die casting. After varying the spraying angle and time, the mold temperature, heat exchange and mold life were predicted. As the spraying angle increases, the maximum temperature of the mold decreases, which is because the spraying area increases and the heat exchange with the mold increases. Heat exchange occurs more actively in the blowing process than in the spraying process. This is because the cooling is not performed due to the steam generation. When the spraying angle is 50 degree, the minimum life of the mold is analyzed 200 times. After adjusting the blowing time from 5s to 3s, the minimum lifetime of the mold has been increased almost twice.

• Design & Manufacturing
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• 제6권2호
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• pp.37-41
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• 2012

Usually compound dies are used in clinch washer production. However, in this study, a fine blanking die is designed and manufactured, and clinch washers are produced by the die. Clinch washers are for electric exhaust gas recirculation (EEGR) and they recirculate some of exhaust gas to reduce harmful substances. Fine blanking automation production eliminates difficulties operators face on conventional press.

• 한국분말재료학회지
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• 제11권5호
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• pp.363-368
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• 2004

In the present study, the focus is on the analysis of the effect of the mold dimensions on the temperature distribution of a die during plasma activated sintering. The temperature distribution of a cylindrical mold with various dimensions was measured using K-type thermocouples. The temperature homogeneity of the die was studied based on the direction and dimensions of the die. A temperature gradient existed in the radial direction of the die during the plasma activated sintering. Also, the magnitude of the temperature gradient was increased with increasing sintering temperature. In the longitudinal direction, however, there was no temperature gradient. The temperature gradient of the die in the radial direction strongly depended on a ratio of die volume to punch area.

• Design & Manufacturing
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• 제14권2호
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• pp.49-55
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• 2020

Recently, when a new component of construction equipment is designed, a stamping process capable of producing parts having high appearance quality and precision has been gaining attention. However, in general, as it is developed based on existing parts made by welding metal sheets and tubes, frequent to die modification occurs, which increases the time and cost of developing new parts. Thus, it is necessary to reduce the cost by shortening the die development period. In this study, a stamping process was designed for the urea tank cover, which is a part for excavators, to reduce the die development period through sheet metal forming analysis. The stamping process was designed by determining the blank holding force after selecting the initial blank shape and size. The round value at the corner was modified such that formability is ensured. After selecting process parameters, the thickness reduction rate and spring-back effect were reviewed.

• Design & Manufacturing
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• 제10권3호
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• pp.30-33
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• 2016

It is true that the plastic shrinkage is inevitable. Shrinkage rate in effect at the time of mold design will soon determine the size of the global product. Process for the shrinkage of the plastic that provides how made, yet it has identified a process for making the question whether the shrinkage that can be trusted, and by the experimental results were as follows: as shrinkage, see ISO but, according to circumstances the process can go to the agreement between the parties. shrinkage ratio of the pressure sensor installed in the specimen mold is essential, amount of pressure sensor is that it is appropriate approximately 2-3. proper holding pressure is a significant effect on shrinkage Mitch, so that the effect of selecting the contraction ratio data according to the appropriate holding pressure during mold making. shrinkage CAE analysis results are difficult to utilize in the mold-making chamber. Based on these results, it concluded by looking forward to the improved products produced shrinkage.

• 산업경영시스템학회지
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• 제19권40호
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• pp.143-155
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• 1996

Presented in this paper are a CAPP(Computer Automated Process Planning) scheme and a generating method of intelligent NC data for unmaned machining of mold die. Mold die surfaces usually have free-formed geometry of complex shapes. So it is easy to overcut the die surface and to overload the cutting tools. It takes tens of hours to prepare process plans and to generate NC data for each processes. Therefore a classification of unit machining operation(UMO) for mold die manufacture, a backward recursive capp algorithm and a generating method of intelligent NC data are presented in this paper in order to provide a unmaned machining architecture of mold die.

• 한국금형공학회:학술대회논문집
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• 한국금형공학회 2008년도 하계 학술대회
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• pp.149-153
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• 2008

The cavity of mold is exposed to high pressure during injection molding operation. Injection molded articles with deep depth are often demanded as design variety increases. Mold becomes weak and deformation increases as the mold depth increases. Thus the injection molds for deep depth articles should be designed to hold out high pressure or stress and large deformation. Through this study, equation for mold design was examined and suggested novel method to determine equation for mold design with deep depth. Novel equation developed in this study was consisted with cantilever and two points bending while previous equation was modified from just cantilever bending. The validity of novel equation was verified through computer simulation.