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소성 가공 해석을 통한 티타늄 합금 볼트 열간 단조 공정 분석
최두선,김태민,항봉석,한유진,고강호,박정래,박규백,이정우,김도언,Choi, Doo-Sun,Kim, Tae-Min,Han, Bong-Seok,Han, Yu-Jin,Ko, Kang-Ho,Park, Jung-Rae,Park, Kyu-Bag,Lee, Jung-Woo,Kim, Do-Un 한국금형공학회 2020 한국금형공학회지 Vol.14 No.1
Titanium alloy has been in the spotlight as a core material in high-tech industries that require high strength and light weight because it has excellent strength and corrosion resistance and strength is higher than that of steel. Therefore, in various industries, existing steel products are intended to be replaced with titanium alloys. Titanium alloys can cause cutting tool breakage during cutting, and heat generated during cutting does not dissipate, accumulates in tools and workpieces, resulting in large wear and tear on thin workpieces. In addition, since titanium alloy is a metal with high chemical activity, the wear of the tool becomes more severe when the cutting speed is high, so machining of titanium bolt through cutting is very disadvantageous in terms of productivity. Therefore, the production of bolts using titanium alloys is being produced through a forging process to improve productivity and product quality. In this paper, hot forging molding analysis was performed on bolts used for fastening automobile parts using Ti-6Al-4V alloy, which is the most commonly used titanium alloy.
최두선(Doo-Sun Choi),제태진(Tae-Jin Je),서영호(Young Ho Seo),황경현(Kyung-Hyun Whang) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
In this paper, we presented reusable quartz master fabricated by electron-beam lithography and preliminary test of injection molding using suggested reusable quartz master. Conventional manufacturing technology of master can not recycle due to patterning with photoresist and is essential of a duplicate process that must manufacture the Father stamper and the Mother stamper. However, we have made it possible of the reusable master by directly patterning on quartz. We developed 100㎚-pit size reusable quartz master with intaglio carving patterns which is more fine size than those of DVD (400㎚) and blue-ray disc (200㎚). In the preliminary test of injection molding, we find optimum injection molding conditions using polypropylene.