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Understanding Blank Holder Effect on Formability of Sheet Metal Stampings
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English
Abstract
Blank holder design, set-up and maintenance are crucial for successful stamping of sheet metal parts. Educated spotting as well as adjustment of the appropriate levels of blank holder forces at the different contact areas is a complex process involving the interaction of die design, die making, prototyping and set-up.
The response of the part to a blank holder set-up depends on the type of press and the source of blank holder action. A finite difference based microcomputer program CUPDRW will be used to illustrate the effect of the type of blank holder and its set-up on the formability of circular drawn shells. A methodology is also presented in this work for the design of blankholders and its set-up for complex parts formed under drawing conditions.
It has been recognized by the industry that control of process and material windows is a prerequisite to the production of quality parts. The paper concludes by examining the effect of material gauge variability and blank holder positioning repeatability on part formability. It is shown that parts drawn in double-action mechanical presses are more sensitive to gauge variability as compared to parts formed with air and hydraulic cushions.
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Citation
Karima, M. and Donatelli, V., "Understanding Blank Holder Effect on Formability of Sheet Metal Stampings," SAE Technical Paper 890347, 1989, https://doi.org/10.4271/890347.Also In
References
- Eary D.F. Reed E.A. “ Techniques of Pressworking Sheet Metal: An Engineering Approach to Die Design ” 2nd Prentice-Hall, Inc. New Jersey 1974
- Sachs G. “ Principles and Methods of Sheet Metal Fabricating ” 2nd Vogeli H.E. Reinhold Publishing Corp. New York 1966
- Schuler L. “ Metal Forming Handbook ” 4th Revised Louis Schuler AG Groppingen 1966
- Karima M. “A Bifurcation Study of Wrinkling in Deep Drawing” Ph. D. Thesis McMaster University Hamilton, Ontario, Canada 1981
- Doege E. Sommer N. “Blank Holder Pressure and Blank Holder Layout in Deep Drawing of Thin Sheet Metal” Proc. of 2nd International Conference on Technology of Plasticity Stuttgart 2 1987 1305 1314
- Karima M. Sowerby R. “A PC Based Computer Aided Analysis System for the Cup Drawing Process” J. Materials Shaping Technology 6 2 1988
- Lange K. “ Handbook of Metal Forming ” McGraw Hill Inc New York 1985
- Emmens W.C. “Material Saving by Using a Varying Blank Holding Force” IDDRG Working Group Meeting Amsterdam, The Netherlands May 1985 7-1 7-5
- Manabe K. Hamano H. Nishimura N. “An improvement in Deep Drawabtlity of Steel /Plastic Laminate Sheets by Control of Blank Holding Force” Proc. of 2nd International Conference on Technology of Plasticity Stuttgart 2 1987 1297 1304
- Karima M. “On The Severity of Drawing Irregular Parts” Near Net Shape Manufacturing Conference ASM International November 1988 87 95
- Grahnert R. “Die Reibungsverhaltnisse im Flanschbereich Beim Tiefziehen Rechteckiger Teile” IFUM Fortschritt-Berichte VDI, Reihe 2: Betriebstechnik 105 1985
- Straβburger Ch. Blumel K. Prange W. “interactions between Cold Rolled Sheet Steel and Forming Process” Proc. of 2nd International Conference on Technology of Plasticity Stuttgart 2 1987 1253 1260
- Siekirk J.F. “A Systems Approach to Sheet Metal Forming Process Control” Proc of 15th Biennial IDDRG Congress Dearborn, Michigan May 1988 1 8