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Effect of Draw Beads on the Mechanical Properties of Sheel Sheet
Technical Paper
2007-01-1692
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Draw beads are used in many stamping dies to control the flow of metal into a die cavity. The multiple bends imposed by the draw beads cause a change in the mechanical properties of the sheet before it enters the die cavity. Since the necessary data to completely characterize the full deformation history of a sheet passing through draw beads are not available, it is not possible to use a fundamental approach to determine the effect on subsequent mechanical properties. In the present investigation data from a prior study [1] are used to develop empirical relationships to predict the yield strength, uniform elongation and tensile strength as a function of the cumulative maximum effective bending strain (ε̅max-cum) due to draw beads and the entry radius to a die cavity. The objective of the present paper is to develop the empirical relationships for several grades of sheet steels and use these relationships to provide insight about the mechanical properties of these steels as they enter the die cavity. For this case, it is found that ε̅max-cum can be used to predict yield strength, uniform elongation, and tensile strength for AKDQ, BH210, HSLA350, and DP600 steels as they enter the die cavity. It is also found that for, ε̅max-cum > 0.15, the resulting uniform elongation, which in true strain is the terminal n-value, is independent of steel grade. It has also been found that the tensile strength in the wall of the die cavity can be used to provide insights on the potential for springback for the four steel grades that were investigated.
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Citation
Levy, B. and Van Tyne, C., "Effect of Draw Beads on the Mechanical Properties of Sheel Sheet," SAE Technical Paper 2007-01-1692, 2007, https://doi.org/10.4271/2007-01-1692.Also In
Steel Innovations, Fatigue Research, Sheet/Hydro/Gas Forming Technology & Advanced High Strength Steel Development
Number: SP-2103; Published: 2007-04-16
Number: SP-2103; Published: 2007-04-16
References
- Levy B.S. Green D.E. “Analysis and Documentation of Laboratory Studies on the Enhanced FLC Concept” Auto/Steel Partnership, 6/20/02
- Matlock D.K. Speer J.G. “Design Considerations for the Next Generation of Advanced High Strength Sheet Steels” in Proceedings of Third International Conference on Advanced Structural Steels Gyeongju, Korea 2006
- Levy B.S. Van Tyne C.J. Moon Y.H. Mikalsen C. “The Effective Unloading Modulus for Automotive Sheet Steels” Paper Number 2006-01-0146 2006 SAE World Congress 2006