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피로강도 향상 및 경량화와 마찰손실 저감을 위한 초음파나노표면개질기술 응용연구
편영식(Youngsik Pyoun),조인식(Insik Cho),홍정화(Junghwa Hong),이창순(Changsoon Lee),박인규(Ingyu Park),서창민(Chang-Min Suh),조인호(Inho Cho),김창식(Changsik Kim) 한국자동차공학회 2007 한국자동차공학회 Symposium Vol.- No.-
Reductions of fuel consumption and CO₂ emission are main goals of recent vehicle development. Increasing fatigue strength, weight and friction reduction of power train components are very effective methods for this goal. Peening technology which induces compressive residual stress on the surface is very efficient technology. Modification of surface topology into micro dimples is a new technology to reduce friction coefficient. Brief introduction of these technologies are presented with comparison of their characteristics and effects. UNSM(Ultrasonic Nano crystal Surface Modification) technology induces a large amount of compressive residual stress in the subsurface, refines the grain size into 50~200 ㎚, and modifies the surface into micro dimple structure which reduces the friction coefficient about 50% simultaneously. Introduction and successful examples of UNSM application are presented. Application results to hub bearing and application idea to crankshaft are also presented. How to satisfy cost criteria is also considered.
편영식(Youngsik Pyoun),박정현(Jeonghyeon Park),조인호(Inho Cho),김창식(Changsik Kim),서창민(Changmin Suh) 대한기계학회 2009 大韓機械學會論文集A Vol.33 No.3
All the failure in fatigue of torsion, bending and rolling contact, and in sliding wear begins mostly from surface. So much efforts have been invested to the surface technology which deal these problems during past decades, but the industrial demand keeps growing and more significant requirements are added to researchers and engineers. Nano crystal surface modification technology which makes the surface layers into nano crystalline, induces big and deep compressive residual stress, increases surface hardness, improves surface hardness, and make micro dimples structure on surface is an emerging technology which can break limits of current surface technology and relieve the burden of researchers and engineers. In this study, a nano crystal surface modification technology which is calling UNSM(Ultrasonic nano crystal surface modification) technology, is introduced and how it has been applied to industry to solve these failure problems is explained.
설계 및 생산기술의 혁신을 위해 필요한 나노표면개질기술
편영식(Youngsik Pyoun),서창민(Changmin Suh),조인호(Inho Cho),김창식(Changsik Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Improving energy efficiency, reducing CO₂ emission, improving durability and reliability, and reduction of total life cost of machine systems and components are main goals of recent design and manufacturing technology in academic and industrial society. All the failure in fatigue of torsion, bending and rolling contact, and in sliding wear and stress corrosion crack begins mostly from surface and grows into subsurface. So much efforts have been invested to the surface technology which deal these problems during past decades, but the industrial demand keeps growing and more significant requirements are added to researchers and engineers. Nano crystal surface modification technology which makes the surface layers into nano crystalline, induces big and deep compressive residual stress, increases surface hardness, improves surface hardness, and make micro dimples structure on surface is an emerging technology which can break limits of current surface technology and relieve the researchers and engineers burden. In this study, a nano crystal surface modification technology which is calling UNSM(Ultrasonic nano crystal surface modification) technology, is introduced and how it has been applied to industry to solve these failure problems is explained with typical examples. The UNSM technology can be utilized to innovate the design and manufacturing technology.