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In this article, the design of the flexible forming process considering die shape compensation using an iterative overbending method based on numerical simulation was conducted. In this method, the springback shape obtained from the final step of the first forming simulation is compared with the desired objective shape, and a shape error is calculated as a vector norm with three-dimensional coordinates. The error vector is inversely added to the objective surface to compensate both the upper and lower flexible die configurations. The flexible die shapes are recalculated and the punch arrays are adjusted according to the over-bent forming surface. These iterative procedures are repeated until the shape error variation converges to a small value. In addition, experimental verification was conducted using a 2000-kN flexible forming apparatus for thick plates. Finally, the configuration of the prototype obtained from the experiment was compared with the numerical simulation results, which had springback compensation. It is confirmed that the proposed method for compensating for the forming error could be used in the design of flexible forming of thick-curved plates.
목차
Abstract
1. 서론
2. 펀치위치계산
3. 반복적 과도 굽힘을 이용한 탄성회복 보정
4. 탄성회복 보정방법의 응용
5. 실험적 검증
6. 결론
참고문헌
참고문헌 (13)
참고문헌 신청
7. [학술지(정기간행물)] - S. Oral / 1997 / The Optimum Die Profile for the Cylindrical Bending of Plates / J. Mater. Process. Technol 70 (1) : 151 ~ 155
8. [학술지(정기간행물)] - J. S. Shu / 1996 / Finite Element Analysis and Optimization of Springback Reduction : the “double-bend” Technique / Int. J. Mach. Tools Manuf 36 (4) : 423 ~ 434
9. [학술지(정기간행물)] - P. Xue / 2001 / An Energy Approach for Predicting Springback of Metal Sheets after Double-curvature Forming, Part I : Axisymmetric Stamping / Int. J. Mech. Sci 43 : 1893 ~ 1914
10. [학술지(정기간행물)] - M. Z. Li / 2002 / Multi-point Forming Technology for Sheet Metal / J. Mater. Process. Technol 129 (1) : 333 ~ 338
11. [학술지(정기간행물)] - A. P. Karafillis / 1996 / Tooling and Binder Design for Sheet Metal Forming Processes Compensating Springback Error / Int. J. MachTools Manuf 36 (4) : 503 ~ 526
8. [학술지(정기간행물)] - J. S. Shu / 1996 / Finite Element Analysis and Optimization of Springback Reduction : the “double-bend” Technique / Int. J. Mach. Tools Manuf 36 (4) : 423 ~ 434
9. [학술지(정기간행물)] - P. Xue / 2001 / An Energy Approach for Predicting Springback of Metal Sheets after Double-curvature Forming, Part I : Axisymmetric Stamping / Int. J. Mech. Sci 43 : 1893 ~ 1914
10. [학술지(정기간행물)] - M. Z. Li / 2002 / Multi-point Forming Technology for Sheet Metal / J. Mater. Process. Technol 129 (1) : 333 ~ 338
11. [학술지(정기간행물)] - A. P. Karafillis / 1996 / Tooling and Binder Design for Sheet Metal Forming Processes Compensating Springback Error / Int. J. MachTools Manuf 36 (4) : 503 ~ 526
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UCI(KEPA) : I410-ECN-0101-2014-551-000257517