박판을 이용한 Z-굽힘 가공의 전개 길이에 관한 연구
A study on the unfolding length of Z-bending machining using thin plate
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초록
The bending process of a press die is to bend a flat blank to the required angle. There are V-bending, U-bending, Z-bending, O-bending etc. for bending processing, and the basic principle of calculating the unfolding length of die processing is used as the neutral plane length. Since the constant of the length value of the neutral surface is different depending on the type of bending, it is impossible to accurately calculate it. In particular, Z-bending processing is performed twice, and it is set on the upper and lower surfaces of the blank, and bending processing occurs at the same time as the upward and downward bending, and the elongation of the material occurs and the material increases. It is not possible to check with the calculated value, and it occurs in many cases where the mold is modified after start-up. This study aims to minimize die modification by developing a formula to calculate the development length of Z-bend.
Abstract
The bending process of a press die is to bend a flat blank to the required angle. There are V-bending, U-bending, Z-bending, O-bending etc. for bending processing, and the basic principle of calculating the unfolding length of die processing is used as the neutral plane length. Since the constant of the length value of the neutral surface is different depending on the type of bending, it is impossible to accurately calculate it. In particular, Z-bending processing is performed twice, and it is set on the upper and lower surfaces of the blank, and bending processing occurs at the same time as the upward and downward bending, and the elongation of the material occurs and the material increases. It is not possible to check with the calculated value, and it occurs in many cases where the mold is modified after start-up. This study aims to minimize die modification by developing a formula to calculate the development length of Z-bend.
참고문헌 (5)
- S. H. Kim, "Diagram press mold design data book", pp.3-1~3-42 (2011), Daegwang Seorim
- S. H. Kim, "Press die design engineering for industrial field practical use", pp.157~ (2011), Daegwang Seorim
- 윤재웅, "박판의 Z-굽힘가공에서 외측 굽힘반지름 치수의 최소화(샤프에지) 가공법에 관한 연구", 한국산학기술학회논문지, 18(2), pp.349~355 (2017), 한국산학기술학회[DOI]
- 김판근, "헤밍 (Hemming) 구조를 가진 박판의 굽힘품질 개선에 관한 연구", 한국정밀공학회지, 29(12), pp.1360~1367 (2012), 한국정밀공학회[DOI]
- H-K Cho, "A Study on the Springback Characteristics during Bending of Sheet", pp.1995