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논문 기본 정보

자료유형
학술저널
저자정보
이기성 (에이테크솔루션) 김종봉 (서울과학기술대학교) 정완진 (서울과학기술대학교) 김종호 (Seoul National University of Science and Technology)
저널정보
한국소성·가공학회 소성·가공 소성가공 제23권 제8호
발행연도
2014.12
수록면
489 - 494 (6page)

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Micro forming is an appropriate process to manufacture very small metal parts which can be employed in the field of electronic devices or electrically controlled mechanical systems. The purpose of the current study was to investigate the influences of both blankholding force and blank diameter for the deep drawing of very small cups. It is essential to control the blankholding force because improper force can result in defects such as wrinkles in the flange or cracks in the corner of the drawn cups. In the current study blankholding force was controlled by springs connected to the blankholder of a press die. Exchangeable bushing dies with various die-corner radii were also used. To obtain the limit drawing ratio for each working condition several sizes of circular specimens were prepared using blanking tools. Beryllium copper(C1720) alloy sheet of 50㎛ thickness was chosen for the experiments. The maximum limit drawing ratio of 2.1 was achieved experimentally for the conditions of the blankholder force(BHF)=5.3kgf and Rd=0.3mm. Both thickness and hardness along the central section of drawn cups were measured and compared for different drawing conditions. It was found that the deviation of measured data in the thickness and hardness distribution increases with increasing blankholder force and blank diameter.

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Abstract
1. 서론
2. 실험
3. 실험 결과 및 고찰
4. 결론
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UCI(KEPA) : I410-ECN-0101-2015-550-002817027