Casting Layout Design Using CAE Simulation

Hong-kyu Kwon(권홍규) 한국산업경영시스템학회 2017 한국산업경영시스템학회지 Vol.40 No.1

A most important progress in civilization was the introduction of mass production. One of main methods for mass production is die-casting molds. Due to the high velocity of the liquid metal, aluminum die-casting is so complex where flow momentum is critical matter in the mold filling process. Actually in complex parts, it is almost impossible to calculate the exact mold filling performance with using experimental knowledge. To manufacture the lightweight automobile bodies, aluminum die-castings play a definitive role in the automotive part industry. Due to this condition in the design procedure, the simulation is becoming more important. Simulation can make a casting system optimal and also elevate the casting quality with less experiment. The most advantage of using simulation programs is the time and cost saving of the casting layout design. For a die casting mold, generally, the casting layout design should be considered based on the relation among injection system, casting condition, gate system, and cooling system. Also, the extent or the location of product defects was differentiated according to the various relations of the above conditions. In this research, in order to optimize the casting layout design of an automotive Oil Pan_BR2E, Computer Aided Engineering (CAE) simulation was performed with three layout designs by using the simulation software (AnyCasting). The simulation results were analyzed and compared carefully in order to apply them into the production die-casting mold. During the filling process with three models, internal porosities caused by air entrapments were predicted and also compared with the modification of the gate system and overflows. With the solidification analysis, internal porosities occurring during the solidification process were predicted and also compared with the modified gate system.

Case Study of Hybrid Tooling using High Speed Cutting and Ceramic SLA (StereoLithography Apparatuses) Technologies

권홍규(Hong-Kyu Kwon),홍정의(Jung-Eui Hong) 한국산업경영시스템학회 2007 한국산업경영시스템학회지 Vol.30 No.2

  “Getting to market first” is extremely critical in this competitive business environment. The speed at which products are developed and released to market is tightly linked to profitability and market share. Many companies that have been very skeptical of Rapid Tooling (RT) technologies developed so far are working on Hybrid Tooling (HT) that can really meet the market standards. This paper describes the experimentation how HT process has been being successfully established and effectively applied with typical case study. Through the experimentation, Ceramic-filled HT was found to be aptly suited for the low grade mold, both in terms of the lead time, dimensional accuracy, and tooling cost.

Casting Layout Design Using Flow & Solidification Analysis-Automotive Part(Oil Pan_BJ3E)

권홍규(Hong-Kyu Kwon) 한국산업경영시스템학회 2019 한국산업경영시스템학회지 Vol.42 No.1

In the modern industrial period, the introduction of mass production was most important progress in civilization. Die-casting process is one of main methods for mass production in the modern industry. The aluminum die-casting in the mold filling process is very complicated where flow momentum is the high velocity of the liquid metal. Actually, it is almost impossible in complex parts exactly to figure the mold filling performance out with the experimental knowledge. The aluminum die-castings are important processes in the automotive industry to produce the lightweight automobile bodies. Due to this condition, the simulation is going to be more critical role in the design procedure. Simulation can give the best solution of a casting system and also enhance the casting quality. The cost and time savings of the casting layout design are the most advantage of Computer Aided Engineering (CAE). Generally, the relations of casting conditions such as injection system, gate system, and cooling system should be considered when designing the casting layout. Due to the various relative matters of the above conditions, product defects such as defect extent and location are significantly difference. In this research by using the simulation software (AnyCasting), CAE simulation was conducted with three layout designs to find out the best alternative for the casting layout design of an automotive Oil Pan_BJ3E. In order to apply the simulation results into the production die-casting mold, they were analyzed and compared carefully. Internal porosities which are caused by air entrapments during the filling process were predicted and also the results of three models were compared with the modifications of the gate system and overflows. Internal porosities which are occurred during the solidification process are predicted with the solidification analysis. And also the results of the modified gate system are compared.

굵은 골재를 이용한 3D 콘크리트 프린팅 기술개발에 대한 연구

황준필,권홍규,Hwang, Jun Pil,Kwon, Hong-Kyu 한국산업경영시스템학회 2022 한국산업경영시스템학회지 Vol.45 No.3

Digitization and automation technologies have rapidly maximized productivity and efficiency in all industries over the past few decades. Construction automation technology has either stagnated over the same period or has not kept pace with overall economic productivity. According to the research studies up to now, the output of concrete structures using coarse aggregates (8mm or more) is very limited due to the limitations of equipment and materials. In this study, information on the development process of 3DCP equipment that can print concrete structures with the printing width (100 mm or more) and printing thickness (30 mm or more) using a 3DCP material mixed with coarse aggregate (8 mm or more) is provided. To verify the performance of the developed 3DCP equipment, experimental data are provided on output variables, the number of layers, and the inter-layer printing time interval. The evaluation and verification data of various mechanical properties (compressive and splitting tensile strength) of printed materials using coarse aggregates are provided.

마케팅자극과 충동구매행동 간의 관계에서 플로우의 매개효과에 관한 연구

오종철(Oh, Jong-Chul),권홍규(Kwon, Hong-Kyu),홍상진(Hong, Sang-Jin) 한국산학기술학회 2010 한국산학기술학회논문지 Vol.11 No.1

본 연구는 새로운 유통환경인 인터넷환경에서 디지털 콘텐츠의 충동구매에서의 마케팅 자극, 플로우, 자기행 동통제 및 감각추구성향간의 영향을 살펴보고자 하였다. 이를 위해 충동구매 동기요인을 기존의 연구들에서 제시된 마케팅자극을 이용하였다. 구매자의 마케팅자극으로 디지털 콘텐츠 구매자들이 받게 되는 제품자극, 가격자극, 촉진자 극으로 구분하여 구매자의 충동구매행동에 미치는 영향을 검증하였다. 이때 구매행위 전에 자신이 받은 자극에 대해 플로우를 경험하는 과정이 나타날 것이다. 플로우(FLOW)는 구매행위자가 받은 자극을 보다 강화시키는 충동구매행위 의 중요한 요소가 될 것이다. 이처럼 인터넷 환경에서는 기존의 충동구매 과정과는 달리 충동구매자극 이후에 더 많 은 정보를 획득할 수 있고 쉽고 빠르게 구매할 수 있기 때문에 마케팅자극이외에 구매자의 심리적인 측면이나 성향 등이 충동구매행동에 있어 보다 중요한 역할을 하게 될 것이다. 행위에 대한 자신의 능력 및 통제 가능성인 자기행동 통제에 따라서 충동구매행동이 다르게 나타나게 될 것이다. 또한 구매자들이 가지고 있는 구매자들의 성향 중에 감각 추구성향은 충동구매를 하는데 조절역할을 하는지에 대한 검증을 하였다. 이를 통해 디지털 콘텐츠 충동구매와 관련 된 학문적인 시사점과 더불어 디지털 콘텐츠 마케터들의 효과적인 마케팅 전략수립에 도움을 주고자 한다. Until now, most of the studies about the impulse buying have focused mainly on the product of off-line shop, while there have relatively been very few studies about the product in internet shopping mall. The goal of this study was to understand Impulse Buying Behavior(IBB) for digital contents in the internet. Data has been collected from 278 respondents. The questionnaire method was adopted to collect the data for this study. The research was conducted by using SPSS 12.0 and AMOS 5.0. It was found that as follows: First, marketing stimulation factors, such as price, product, promotion was related positively to FLOW. Second, marketing stimulation factors was related partly positively to IBB. Third, FLOW has mediating effects in the relations between marketing stimulation factors and IBB. Finally, Self-Behavior Control and Sensation Seeking Tendancy has moderating effect in the IBB process. Thus, It also provides a core strategic Implication with Digital Contents Marketers.

지방정부 관광 홈페이지의 사용성 연구

장무경(Moo-Kyung Jang),권홍규(Hong-Kyu Kwon) 한국엔터테인먼트산업학회 2016 한국엔터테인먼트산업학회논문지 Vol.10 No.2

어떤 지역의 관광정보는 그 지역을 표현하는 다양한 정보로 구성된다. 이러한 정보에는 해당 지역의 사회적, 문화적, 지리적, 그리고 역사적 배경과 사실 정보들이 모두 포함된다. 이러한 폭넓은 관광정보를 체계적으로 제공할 수 있는 거의 유일한 수단으로서 지방자치단체의 홈페이지가 고려되고 있다. 본 논문에서는 정보의 접근성 측면에서 지방자치단체의 홈페이지 현황을 분석하고 개선 방안을 제안한다. 정보의 접근성을 고려하기 위한 기준으로서 외부 검색포탈에 대한 노출성, 홈페이지의 메뉴체계, 연관 정보들 간의 링크 관리가 중요하다. 즉, 관광객이 원하는 정보가 쉽게 검색되어야 하며, 정보 검색을 통해 방문한 고객들에게 보다 구체적인 정보를 제공하기 위해서는 정보간 링크가 의미있게 관리되어야 하고, 지자체에서 제공하는 다양한 정보들의 분류가 체계적으로 이루어져야 한다는 의미이다. 또한, 정보의 생산자 역할과 정보의 배포자 역할을 구분함으로써 보다 체계적인 관광정보 제공이 가능할 것으로 보인다. 해당지역에 대해 가장 광범위한 정보를 보유하고 있는 지자체는 관광정보의 쏘스가 되고, 이러한 정보들이 민간 기업들을 통해 다양한 형태로 가공, 정제되어 관광객들에게 제공될 수 있도록 하는 정보의 생태계를 만드는 것이다. 이러한 시도는 국내 모든 관광정보들이 상호 연관되는 분산형 관광정보 인프라의 구축에 기여할 수 있을 것으로 판단된다. Tour information is composed of various information sources such as a cultural, geographical, and historical backgrounds and related facts. A local government"s tours portal, usually included in the government"s home page, is being considered as the most appropriate means for providing tourist information about the area under the control of the government. This paper investigates tour home pages of domestic local governments in terms of information accessibility and proposes a plan to improve the usability of the tours portal. As a result, information accessibility can be best evaluated from the three criteria such as exposedness to private portal"s keyword search, information architecture of the home page, and proper management of links between related web pages. That is, visitors can reach to information provided by the local government"s home page via the search results of private portals and then they can gather more detailed information through navigation of web pages, guided by home page menus and web page links. Based on the investigation, to improve the usability of tours portal, it is necessary to separate information producers from information distributors. Local governments play roles of producing tour information and offer interfaces to allow other parties to access their information bases. Through the interfaces, business operators can collect necessary information, rebuild new information and distribute it to tourist. This trial makes it possible to connect all the distributed tour information on the internet and can give an opportunity to build a kind of tour information ecology.

Mahalanobis Taguchi System을 이용한 다변량 시스템의 해석에 관한 연구

홍정의(Jung-eui Hong),권홍규(Hong-kyu Kwon) 한국산업경영시스템학회 2009 한국산업경영시스템학회지 Vol.32 No.1

Mahalanobis Taguchi System (MTS) is a pattern information technology, which has been used in different diagnostic applications make quantitative decisions by constructing a multivariate measurement scale using data analytic methods without any assumption regarding statistical distribution. The MTS performs Taguchi's fractional factorial design based on the Mahahlanobis Distance (MS) as a performance metric. In this work, MTS is used for analyzing Wisconsin Breast Cancer data which has ten attributes. Ten different tests are conducted for the data to determine if the patient has cancer of not. Also, MTS is used for reducing the number of test to define the relationship between each attribute and diagnosis result. The accuracy of diagnosis is compare with two different previous research.

유동 및 응고해석을 이용한 자동차용 부품(하우징)개발에 대한 사례연구

정병국(Byoung Guk Jeong),권홍규(Hong Kyu Kwon) 한국산업경영시스템학회 2015 한국산업경영시스템학회지 Vol.38 No.1

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.

Mahalanobis Taguchi System을 이용한 자동차 브레이크 성능 만족도를 고려한 설계조건 선정에 관한 연구

홍정의(Jung-Eui Hong),권홍규(Hong-Kyu Kwon) 한국산업경영시스템학회 2007 한국산업경영시스템학회지 Vol.30 No.1

  Mahalanobis Taguchi-System (MTS) is a pattern information technology, which has been used in different diagnostic applications to make quantitative decisions by constructing a multivariate system using data analytic methods without any assumption regarding statistical distribution. MTS performs Taguchi’s fractional factorial design based on the Mahalanobis distance as a performance metric. In this work, MTS used for analyzing automotive brake feeling system, which measured as a brake feel index (BFI) from 9 attributes. The automobile which has a good BFI score treated as a normal group for constructing Mahalanobis space. The results of this research show that two attributes (Pre load & Max deceleration) have a minus gain value and can be removed from further analysis. The difference of MD value between using all 9 attributes and just using significant attribute compared.

수중적층용 3D 콘크리트 프린팅 장비 개발에 대한 연구

황준필(Jun Pil Hwang),이호재(Hojae Lee),권홍규(Hong-Kyu Kwon) 한국산업경영시스템학회 2021 한국산업경영시스템학회지 Vol.44 No.3

Recently, the demand for atypical structures with functions and sculptural beauty is increasing in the construction industry. Existing mold-based structure production methods have many advantages, but building complex atypical structures represents limitations due to the cost and technical characteristics. Production methods using molding are suitable for mass production systems, but production cost, construction period, construction cost, and environmental pollution can occur in small quantity batch production. The recent trend in the construction industry calls for new construction methods of customized small quantity batch production methods that can produce various types of sophisticated structures. In addition to the economic effects of developing related technologies of 3D Concrete Printers (3DCP), it can enhance national image through the image of future technology, the international status of the construction civil engineering industry, self-reliance, and technology export. Until now, 3DCP technology has been carried out in producing and utilizing residential houses, structures, etc., on land or manufacturing on land and installing them underwater. The final purpose of this research project is to produce marine structures by directly printing various marine structures underwater with 3DCP equipment. Compared to current underwater structure construction techniques, constructing structures directly underwater using 3DCP equipment has the following advantages: 1) cost reduction effects: 2) reduction of construct time, 3) ease of manufacturing amorphous underwater structures, 4) disaster prevention effects. The core element technology of the 3DCP equipment is to extrude the transferred composite materials at a constant quantitative speed and control the printing flow of the materials smoothly while printing the output. In this study, the extruding module of the 3DCP equipment operates underwater while developing an extruding module that can control the printing flow of the material while extruding it at a constant quantitative speed and minimizing the external force that can occur during underwater printing. The research on the development of 3DCP equipment for printing concrete structures underwater and the preliminary experiment of printing concrete structures using high viscosity low-flow concrete composite materials is explained.