홀 확장시험기의 실시간 정렬 및 크랙 정합성 평가방법

다국어 초록 (Multilingual Abstract)

Purpose: This paper proposes a real-time assessment method for the tool alignment and consistency enhancement of hole expansion testers. To achieve credible hole expansion test outcome, it is crucia to obtain objective results in the tool alignment, moment of crack initiation, expanded hole size.
Methods: First, a method for automated tool alignment and real-time consistency evaluation using the expanded hole image of the tested specimen is proposed. the tool alignment process can be categorized with the alignment of the test specimen and tool in the preparation, clamping and hole expansion stages. Second, this study also proposes a valid crack assessment process and crack position reliability evaluation method based on a credible image processing technology.
Results: The effectiveness of the formulate methodology was demonstrated its real-time industrial implementation.
Conclusion: The real-time tool alignment methodology was developed based on the enhanced consistency evaluation mechanism for hole expansion testers using expanded hole images. In addition, the adjustment of this enhanced consistency evaluation mechanism according to the crack position was proposed. The formulated tool alignment technique was validated through in-field industrial application.

목차 (Table of Contents)

• 1. 서론
• 2. 홀 확장시험기의 신뢰성평가
• 3. 홀 확장시험 크랙의 정합성 평가
• 4. 시스템 구현 및 실험결과
• 5. 결론
• References

참고문헌 (Reference)

1 장승현, "형태 인식 기술을 이용한 판재의 홀 확장성 평가 시스템 개발" 대한기계학회 37 (37): 161-168, 2013

2 C. Krempaszky, "Towards more efficient hole expansion testing" 204-209, 2014

3 S. H. Choi, "The micromechanical deformation behaviors of hot-rolled 590FB steel during hole-expansion test" 58 : 184-200, 2014

4 D. M. Neto, "Study of the frictional contact conditions in the hole expansion test" 1063 (1063): 1-6, 2018

5 M. Huang, "Standardization and automation of hole expanding test" 2011

6 Y. S. Kim, "Review of formability and forming property for stainless steel" 20 (20): 193-205, 2011

7 S. K. Paul, "Prediction of hole expansion ratio for automotive grade steels" 89 : 189-197, 2014

8 "Metallic Materials-Sheet and Strip-Hole Expanding Test"

9 M. Dünckelmeyer, "Instrumented hole expansion test" 50-57, 2009

10 J. Goncalves, "Importance of hole punching conditions during hole expansion test" 1-8, 2018

11 최승호, "Image processing algorithm for real-time crack inspection in hole expansion test" 한국정밀공학회 20 (20): 1139-1148, 2019

12 M. Stanton, "Hole expansion of aluminum alloys for the automotive industry" 1353 (1353): 1488-1493, 2011

13 R. J. Comstock, "Hole expansion in a variety of sheet steels" 15 (15): 675-683, 2006

14 X. Chen, "Hole expansion characteristics of ultra high strength steels" 81 : 718-723, 2014

15 A. Karelova, "Formability of advanced high strength steels determined by instrumented hole expansion testing" 2 : 1358-1368, 2009

16 A. Leonhardt, "Automated hole expansion test with pneumatic crack detection" 480 : 1-7, 2019

17 J. Canny, "A computational approach to edge detection" PAMI-8 (PAMI-8): 679-698, 1986