Abstract
Abstract A screw is a type of fastener characterized by a helical ridge known as thread. The demands for screws with the miniaturization and weight reduction are increasing for the trend of small size of mobile devices. The successful designs of mold and process are very important to obtain screws with good mechanical properties and highprecision. In this study, the design of cold forging process of micro screw was carried out by using finite elementmethod. In particular, in order to investigate the effects of die geometries and friction, design of experiment methodwas adopted and it was revealed that the friction was the dominant factor of folding defects. From these results, the design of die was modified and experiments were carried out with the modified die. From the experimental results,it was found that the folding defects disappeared. Key Words : Cold Forging, Die Design, Finite Element Method, Micro Screw 본 논문은 2014년도 정부의 재원으로 한국산업단지공단의 산업집적지경쟁력강화사업의 지원을 받아 수행되었음. * Corresponding Author : Du-Soon Choi(Korea National University of Transportation) Tel: +82-43-841-5128 email: dschoi@ut.ac.krReceived April 30 2015Accepted June 11, 2015Revised June 2, 2015Published June 30, 2015
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