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김세환,Kim, Sei-Hwan 한국금형공학회 2008 한국금형공학회지 Vol.2 No.1
Restriking method is to add to process in order to get the correct size and high precision accuracy of product which is formed in pre-process. This method is widely used at bending work and drawing work. Restriking die is particularly design and used as restriking process is performed. Therefore, production cost is increasing as one process or a two process are added. In this paper, punches and die block of square shell drawing die which could be performed drawing work and restriking process by using only one die are designed in order to solve these factors. The structure of sectional die which can integrate drawing die and restriking die was developed.
창호용 롤러 하우징의 전단금형 설계 및 제작에 관한 연구
김세환,최계광,Kim, Sei-hwan,Choi, Kye-kwang 한국금형공학회 2014 한국금형공학회지 Vol.8 No.1
Window roller housings are durable because high-quality source materials such as stainless steel is used in making them. After a series of precise structure analysis, their design is optimized. They are subject to repetitive driving tests of more 100,000 times, durability tests, impact resistance tests, corrosion tests and others. For a long time, gaps often occur in press molded products owing to serious squareness deformation and flatness deformation of them. Severe burrs in press molded products require frequent grinding, which leads to short life cycle and rough or unreliable movement of assembled roller housing, which, in turn, causes product defects. This study focuses on developing measures to resolve existing defects and to improve lifespan of dies by designing and making a window roller shearing die.
김세환,최계광,Kim, Sei-hwan,Choi, Kye-kwang 한국금형공학회 2012 한국금형공학회지 Vol.6 No.2
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.
김세환,최계광,Kim, Sei-hwan,Choi, Kye-kwang 한국금형공학회 2012 한국금형공학회지 Vol.6 No.1
Test work is the press die branch at The Korea-China-Japan Grand Prize Contest. This study focuses on strip layout design for test work. A comparison is drawn between product shape and blank deployment line. During the forming analysis of the whole product, shape part of the total forming process is analyzed. As for forming part and flange deployment, forming analysis is carried out in part during the mid process. Material utilization is 42.6 percent and strip layout design is completed in 14 processes that are comprised of hourglass, slotting, embossing, drawing and trimming.
2차 가공이 와이어 컷 방전가공면 표면조도 분포에 미치는 영향에 관한 연구
김세환,최계광,Kim, Sei-hwan,Choi, Kye-kwang 한국금형공학회 2012 한국금형공학회지 Vol.6 No.1
Unlike conventional single special cut methods, W-EDM is a combination of multiple-effects. This study focuses on the effects of second cut on the roughness of surfaces treated with W-EDM. W-EDM is, to a large extent, typical unmanned-machining equipment, which represents NC machining equipment that allows long-time full automation. W-EMD is getting popular as a precise machining technology and STD11 is frequently used in press die manufacture. In this study, the former is applied to the latter to look at the effects of second cut on the roughness of surfaces treated with W-EDM.
볼트 체결부 도난방지 안전캡 드로잉금형의 불량과 대책에 관한 연구
김세환,최계광,Kim, Sei-hwan,Choi, Kye-kwang 한국금형공학회 2012 한국금형공학회지 Vol.6 No.1
Anti-theft safety caps for bolted joints are necessary to ensure the safety of citizens and prevent theft of manholes, bridge guardrails, bulletin boards, subway safety handrails and others. Safety caps enhance the look of bolted joints, avert accidents that involve hitting the head of bolts, hamper them from coming loose by covering the head of bolts. This study focuses on press die design methods and press molding condition setting to resolve bursting and cracks in products, and on molding material selection and heat treatment technologies to boost life extension.
배전용 폴리머 라인 포스트 애자 금형의 불량과 대책에 관한 연구
김세환,최계광,Kim, Sei-hwan,Choi, Kye-kwang 한국금형공학회 2012 한국금형공학회지 Vol.6 No.2
In this study, an injection mold is made to produce polymer line post insulators. FRP (fiber reinforced plastics) is covered by silicone housing. In injection molding process, chances for offcenter are 60 percent. Given the structure of the product, offcenter occurs owing to the imbalances in positions of gates and improper -designs of cores and jigs. This study focuses on mold modifications and improvements.
반도체금형에서 부속부품의 재료선정 및 개선과 제작에 관한 연구
김세환,최계광,Kim, Sei-hwan,Choi, Kye-kwang 한국금형공학회 2014 한국금형공학회지 Vol.8 No.1
Alloy tool steel such as SKD11 and SKD61 or high speed tool like SKH51 are used as materials for semiconductor dies. Cavities, curl blocks, pot blocks and housings are made from those materials. To make those parts from alloy tool steel or high speed tool, one utilizes discharge machining, and mechanical machining including machining center, milling, drilling, forming grinding and others. In the process of cutting machining and polishing, the die materials become unsuitable for machining owing to bubbles and foreign substances in them, which hinders production process. Therefore, this study focuses on die material selection criteria, and on analysis and comparison of material characteristics to help companies to solve their problems, make die manufacture less burdensome and extend die life.
김세환,최계광,Kim, Sei-hwan,Choi, Kye-kwang 한국금형공학회 2012 한국금형공학회지 Vol.6 No.2
This study looks at plastic mold design for robots and mold manufacture, which is an injection mold branch at The Korea-China-Japan University Grand Prize Contest. Product analysis and layout, molding analysis, and upper and lower core design are carried out to design molds in 2D and 3D. After the design of the cores, NC machining software is used for simulation before actual manufacture. Before the production of end-product, test injection is done to troubleshoot problems like bad dimensions, burr, cracks and stepped pulley.
김세환,최계광,Kim, Sei-hwan,Choi, Kye-kwang 한국금형공학회 2014 한국금형공학회지 Vol.8 No.1
Even though 3D press die design gains more attention everyday in Korea, there are shortages of infrastructure and proper environments for it. What is most needed is human resources development and 3D die design standardization, on which the pace of 3D die design adoption depends. This study focuses on 3D press die design process by looking into an instance in which 3D die design system had been used to sell dies to a company "S" in Japan.