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이용덕(Y. D. Lee),차용훈(Y. H. Cha),김기풍(K. P. Kim) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.10
This study is performed to investigate shearing characteristics for vibration damping sheet metals which are bonded with dissimilar sheet metals. A shearing tool set is designed and manufactured and shearing tests with the tool set are conducted at varying the magnitude of clearance in order to analyze the shearing characteristics. The shearing characteristics are analyzed for burr height and shape of sheared faces with respect to the magnitude of clearance between the punch and the die. The shearing test results demonstrate that optimum clearance is 8~12% of the sheet thickness at the shearing of the vibration damping sheet metals and the shearing direction has to controlled deriving occurrence of the burr at the thick sheet of the vibration damping sheet metals.
AZ31B 합금판재 성형관련 기초물성 실험 및 해석 연구
김세호(S. H. Kim),박기동(K. D. Park),장정호(J. H. Jang),김경태(K. T. Kim),이형욱(H. W. Lee),이근안(G. A. Lee),김기풍(K. P. Kim),이용신(Y. S. Lee) 한국소성·가공학회 2008 소성가공 : 한국소성가공학회지 Vol.17 No.7
In this paper, tension tests and formability tests are performed to construct a database related to mechanical properties and the formability of the AZ31B Mg alloy sheet. A forming test with a hemi-spherical punch is conducted at varying temperatures to establish a forming limit diagram. In order to verify the applicability of the analysis using the conventional flow hardening model, a finite element analysis is performed on the hemi-spherical punch forming process and the results are compared with experimental ones. The study investigates problems involving a computational analysis that does not consider flow softening of the magnesium alloy at elevated temperatures.