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    초록·키워드

    Recently, the use of high strength steels (HSS) for automotive applications has been drastically increased not only to enhance the safety and durability of vehicles, but also to lighten the weight for a high degree of fuel efficiency. In the side trimming operation in the production of HSS, knife breakage and burr frequently occur. In addition, such breakage and bad quality of strip cutting face affect the yield strength and reduced the productivity and reliability on production line. This study examined the variation of mechanical properties of the tool steel (SKD-61) by ultrasonic nano crystal surface modification technology (UNSM). Same ultrasonic nano crystal surface modification technology (UNSM) process was applied to produce the trimming knife. Their effectiveness and reliability of the UNSM were successfully verified through the field test by trimming process in cold rolling line of the corporation, POSCO.

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      UCI(KEPA) : I410-ECN-0101-2009-550-016063950