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The Effects of Zinc Coatings, Die Materials and Lubricants on Sheet Metal Formability
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English
Abstract
The results of a program Co evaluate lubricity test methods and different lubricant-tool-material combinations are described. This effort was specifically directed towards understanding soft and hard tool interactions and identifying the causes contributing to the discrepancies that exist between soft and hard tool trials on bare and zinc coated sheet steels. Both the LDH and drawbead simulation tests were evaluated, and it was concluded that either test can be used to adequately identify main effects and the Important lubricant-tool-sheet material interactions. However, the drawbead test was judged to be slightly superior because of its sensitivity to speed effects. More importantly, these results indicate that only for bare steels will the soft tool trials adequately predict hard tool performance. Zinc coated steels, with their more variable surface topographies, will give more unpredictable results because of the strong lubrleant-tool-material and speed-lubricant-tool interactions. Galvannealed steel was shown to exhibit an exceptionally strong interaction with soft tooling at low speeds. Because of these interactions, lubricants for soft tool trials on zinc coated steels must be carefully chosen to produce results equivalent to those obtained on hard tools.
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Authors
Citation
Brazier, W. and Thompson, R., "The Effects of Zinc Coatings, Die Materials and Lubricants on Sheet Metal Formability," SAE Technical Paper 860434, 1986, https://doi.org/10.4271/860434.Also In
References
- Box G. P. Hunter W. G. Hunter J. S. “Statistics For Experimenters,” J. Wiley and Sons 1978 323
- Nine H. D. private communication
- Brazier W. G. Izworski N. Unpublished research Ford LDH Program Test Procedure
- Ayres R. A. Brazier W. G. Sajewski V. F. “Evaluating the GMR-Limiting Dome Height Test as a New Measure of Press Formabillty Near Plane Strain,” J. Applied Metal-working July 1979 41 49
- Nine H. D. “Drawbead Forces in Sheet Metal Forming,” Mechanics of Sheet Metal Forming Koistinen D. P. Wang N. -M. Plenum Press 1978 179 211
- Brazier W. G. Thompson R. W. “The Effect of Die Materials and Lubrication on Punch Stretching and Drawing Forces of Cold-Rolled and Zinc-Coated Steels,” SAE Technical Paper 850274