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내통의 플래시 및 충진불량에 대한 해결방법에 관한 연구
김세환,최계광,이춘규,Kim, Sei-hwan,Choi, Kye-kwang,Lee, Choon-kyu 한국금형공학회 2012 한국금형공학회지 Vol.6 No.2
Inner part is used as an insulator in wire fuses. After injection molding, inner part has been showed flashes, filling defects and deformation. After production, operators have to cut off flashes, one by one. this process leads to continuous low productivity and loss of source materials. This study focuses on identifying the causes for flashes, filling defects, clamping force of injectors, mold adhesion, resin of liquidity and others, and on resolving those issues.
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.
합금공구강(STD 11)의 방전가공면 변질층 제거에 관한 연구
김세환,Kim, Sei-Whan 한국금형공학회 2007 한국금형공학회지 Vol.1 No.1
This paper has comparatively analyzed the characteristics of the machined surface of a specimen made by machining Die Steel STD11 and a specimen obtained by W-EDM steel. If a press die is manufactured through W-EDM, products of shapes that cannot easily be made through machining can be manufactured easily. However, the life of the press die is significantly reduced compared with the press die made through machining. This is believed to be caused by the deformed layer that has occurred on the surface of the press die that was made through W-EDM. The roughness of the 2 specimens was measured, and it was learned that the distribution of the roughness of the specimen made through the 1st W-EDM was rough.
에어모터 하우징 양산용 다이캐스팅 금형의 불량과 대책에 관한 연구
김세환,최계광,Kim, Sei-hwan,Choi, Kye-kwang 한국금형공학회 2012 한국금형공학회지 Vol.6 No.1
HI-WORTH T-32, a non-powered plasma cutter, is a portable cutter that utilizes compressor-plasma inverter. With a special air-pressure piston, the cutter is semiautomatic. When they were produced by die casting dies, the bodies or housings of the cutter have defects about 100 percent of defect rate due to blisters and thermal deformation. Therefore, they are produced by mechanical machining, which leads to a hike in material and machining costs and to the loss of productivity. And companies are left with insignificant profit margins. Besides mechanical machining, this study proposes to modify defective mold and cut down defective rate and boost productivity.
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.
각통 드로잉용 펀치와 다이구멍의 각반지름 설계에 관한 연구
김세환,Kim, Sei-Whan 한국금형공학회 2008 한국금형공학회지 Vol.2 No.4
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.
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.
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.
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.