This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Simplified Formability Analysis for Die Development and Production Troubleshooting
Annotation ability available
Sector:
Language:
English
Abstract
Formability analysis of automotive body stampings has typically employed use of circle grid analysis (CGA) techniques. These methods are widely accepted by users and suppliers throughout the industry. Although a proven means of measuring sheet metal deformation, the CGA methodology is not without drawbacks. Utilization of thickness strains to determine formability both compliments CGA and simplifies strain analysis. Using the constant volume equation, a four-step approach to thickness strain analysis (TSA) is provided. Differences between original and final thickness can be readily converted to strain readings and plotted on developed thickness strain diagrams (TSD). Also presented is a case study which illustrates effective TSA techniques during tooling development to ensure an adequate part safety margin.
This alternative technique to formability analysis offers many benefits over traditional CGA methods. Some of these include: ease of understanding, improved reproducibility, less time consumed, and less labor intensive. The advantages of using thickness strains have the potential to directly impact sheet metal formability and design via increased acceptance and understanding by tool and die makers and engineers.
Recommended Content
Technical Paper | Sputter Coating-Its Principles and Potential |
Technical Paper | Advances in Wet Friction Materials 75 Years of Progress |
Technical Paper | Early Involvement |
Authors
Citation
Hogarth, D., Gregoire, C., and Caswell, S., "Simplified Formability Analysis for Die Development and Production Troubleshooting," SAE Technical Paper 910517, 1991, https://doi.org/10.4271/910517.Also In
References
- “Sheet Steel Formability,” AISI August 1 1984 27 34
- Keeler S. P. “Statistical Deformation Control for SPQC Monitoring of Sheet Metal Forming,” SAE Paper # 850278 1985
- Deis B. R. “Thickness Strain Analysis as a Tool for Process Control in Metal Forming,” SAE Paper # 900279 1990
- Hogarth D. J. “Implementation of SDC at a Major Stamping Facility,” NSC Internal Report May 1 1989
- Branson Krautkramer CL 300 Operating Manual
- Dieter G. E. “Mechanical Metallurgy,” Second 1976 77 78
- Mueschenborn W. Meyer L. Strassburger C. Materials Engineering Congress Chicago October 1973
- Gray J. M. AIME Symposium on “Materials for Vehicle-Weight Reduction,” Detroit February 1973
- Ferry B. N. SAE Paper #74018 February 1974 1 7
- Maloney J. P. Heimbuch R. A. Rose L. J. Automotive Engineering July 1974 24 32
- Keeler S. P. Sheet Metal Industry 1971 48 5 10
- Hecker S. S. Proceedings of the 7th Biennial Congress of the International Deep Drawing Research Group Amsterdam October 1972 5.1 5.8
- Hecker S. S. American Deep Drawing Research Group Meeting Pittsburgh May 1973
- Keeler S. P. SAE Paper # 650535 May 1965 1 9
- Goodwin G. M. SAE Paper # 680093 January 1968 1 12
- Chatfield D. A. Keeler S. P. Metal Progress 1971 99 60 65
- American Deep Drawing Research Group Proceedings of the 7th Biennial Congress of the International Deep Drawing Research Group Amsterdam October 1972 18.1 18.7
- Hecker S. S. Metals Engineering Quarterly 1973 13 42 48
- Lee A. P. Hiam J. R. Canadian Institute of Metallurgy 12th Annual Conference of Metallurgists Quebec 1973
- Hanai S. et. al. Proceedings of the 8th Biennial Congress of the International Deep Drawing Research Group Sweden September 1974 92 105
- Painter M. J. Pearce R. Proceedings of the 8th Biennial Congress of the International Deep Drawing Research Group Sweden September 1974 106 119
- Cantalejos N. A. Dewsnap R. T. Maynard R. A. Proceedings of the 8th Biennial Congress of the International Deep Drawing Research Group Sweden September 1974 133 146
- Forming Limit Diagram Users Group 1990