한국해양공학회:학술대회논문집 (Proceedings of the Korea Committee for Ocean Resources and Engineering Conference)
- 한국해양공학회 2006년 창립20주년기념 정기학술대회 및 국제워크샵
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- Pages.35-40
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- 2006
Mechanical Characteristics of Nano-Structured Tool Steel by Ultrasonic Cold Forging Technology
- Suh, Chang-Min (School of Mechanical Engineering, Kyungpook National University) ;
- Song, Gil-Ho (Technical Research Center, POSCO) ;
- Suh, Min-Soo (School of Mechanical Engineering, Kyungpook National University) ;
- Pyoun, Young-Shik (Dept. of Mechanical Engineering, SunMoon University) ;
- Kim, Min-Ho (School of Mechanical Engineering, Kyungpook National University)
- 발행 : 2006.11.16
초록
Ultrasonic cold forging technology (UCFT) utilizing ultrasonic vibration energy is a method to induce severe plastic deformation to a material surface, therefore the structure of the material surface becomes a nano-crystal structure from the surface to a certain depth. It improves the mechanical properties; hardness, compressive residual stress, wear and fatigue characteristics. Applying UCFT to a rolling process in the steel industry is introduced in this study. First, the UCFT specimens of a tool steel (SKD-61/equivalent H13) are prepared and tested to verify the effects of the UCFT in a variety of mechanical properties, the UCFT is applied to the trimming knives in a cold rolling process. It has been determined that UCFT improves the mechanical properties effectively and becomes a practical method to improve productivity and reliability by about two times compared with the conventionally treated tooling in the trimming process in a cold rolling line.
키워드