Electrically assisted blanking using the electroplasticity of ultra-high strength metal alloys |
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| Authors: | Woong Kim Kyeong-Ho Yeom Nguyen Trung Thien Sung-Tae Hong Byung-Kwon Min Soo Ik Oh Moon-Jo Kim Heung Nam Han Hyun-Woo Lee |
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| Affiliation: | 1. School of Mechanical Engineering, Yonsei University, Seoul, South Korea;2. School of Mechanical Engineering, University of Ulsan, Ulsan, South Korea;3. Department of Mechanical & Aerospace Engineering, Seoul National University, Seoul, South Korea;4. Department of Materials Science & Engineering and Center for Iron & Steel Research, RIAM, Seoul National University, Seoul, South Korea;5. Innovative Engineering Team, MS Autotech Co., Ltd, Anyang, South Korea |
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| Abstract: | The electroplastic tensile behavior of ultra-high strength steels (UHSS) subject to a single pulse of electric current is briefly introduced, and electrically-assisted (EA) blanking, which utilizes this electroplastic characteristic, is suggested. The experimental result shows that the blanking load of EA blanking is clearly lower than that of blanking with local resistance heating, which is lower than that of cold blanking. No significant change in material properties was observed in the EA blanked parts at the electric energy densities selected in the present study. EA blanking or trimming is expected to minimize or even eliminate the need for expensive and time-consuming laser trimming in the manufacture of automotive parts using UHSS. |
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| Keywords: | High strength steel Tensile strength Electroplasticity |
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