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진공사출금형용 STS316L 금속 다공체 제조 및 기계적 특성
김세훈,김상민,노상호,김진평,신재혁,성시영,진광진,김태안,Kim, Se Hoon,Kim, Sang Min,Noh, Sang Ho,Kim, Jin Pyeong,Shin, Jae Hyuck,Sung, Si-Young,Jin, Jin Kwang,Kim, Taean 한국분말야금학회 2015 한국분말재료학회지 (KPMI) Vol.22 No.3
In this study, porous stainless steel (STS316L) sintered body was fabricated by powder metallurgy method and its properties such as porosity, compressive yield strength, hardness, and permeability were evaluated. 67.5Fe-17Cr- 13Ni-2.5Mo (wt%) powder was produced by a water atomization. The atomized powder was classified into size with under $45{\mu}m$ and over $180{\mu}m$, and then they were compacted with various pressures and sintered at $1210^{\circ}C$ for 1 h in a vacuum atmosphere. The porosities of sintered bodies could be obtained in range of 20~53% by controlling the compaction pressure. Compressive yield strength and hardness were achieved up to 268 MPa and 94 Shore D, respectively. Air permeability was obtained up to $79l/min{\cdot}cm^2$. As a result, mechanical properties and air permeability of the optimized porous body having a porosity of 25~40% were very superior to that of Al alloy.
자동차용 암레스트의 미세다공 사출성형 공정에 대한 연구
서봉현(Bong Hyun Seo),노상호(Sang Ho Noh),최광복(Kwang Bok Choi),진광진(Kwang Jin Jin),박상언(Sang Un Park) 대한기계학회 2018 大韓機械學會論文集A Vol.42 No.6
최근 자동차 제조업계에서는 국제 환경규제에 대응하기 위한 온실가스 저감 및 주행중 VOCs 감소를 위하여 경량화에 대한 연구를 활발히 진행 중에 있다. 본 연구에서는 자동차용 도어 암레스트 제품의 경량화를 위하여 열가소성 폴리프로필렌 수지와 화학적 발포제를 적용하여 미세다공 사출성형 공정을 구현하였다. 성형 해석을 통하여 제품의 결함과 성형성을 예측하였으며, 이를 미세다공 사출성형 공정에 적용하여 도어 암레스트 시제품을 제작하였다. 사출성형 시 발포 셀 성장을 위하여 코어백 기술을 적용하였고, 해석 결과와 실제 제품의 SEM 촬영을 통한 발포 셀 크기를 분석하였다. Automotive manufacturers have been developing lightweight vehicles of late to reduce CO₂ and volatile organic compound (VOC) emissions and to meet international environmental regulations. In this study, we focused on a microcell injection molding process to develop lightweight automotive armrests made of thermoplastic polypropylene and chemical blowing agents. Prototype door armrests were fabricated using the microcell injection molding process, and part defects and moldability were predicted through a molding analysis. Core-back technology was used in the injection molding process to increase the cell growth. In addition, the cell sizes were investigated using scanning electron microscopy for actual part and molding simulations.