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Interactive Effects between Sheet Steel, Lubricant and Measurement System
ISSN: 0148-7191, e-ISSN: 2688-3627
To be published on April 14, 2020 by SAE International in United States
This study assessed the interaction between sheet steel, lubricant and measurement system under typical sheet forming conditions. Deep Drawing Quality Bare, Electrogalvanized and Hot Dip Galvanized mild sheet steel, were tested under a Draw Bead Simulator (DBS). Lubricant conditions varied from thoroughly dry (0% lube) to overlubricated (>6 g/m2); with 1g of lubricant per m2 as the target of general usage. Mixed lubrication cases, with incremental amounts of a lubricant applied over an existing base of 1 g/m2 rust protection oil, were analyzed. The results show distinctive differences and similarities on friction between the bare material and the coatings. While friction on the bare substrate was higher than the coatings under lubricated conditions, it was significantly more tolerant to dry conditions. Stick-slip behavior was studied as a measurement system response to intermittent friction between the testing tools. These measurement test responses, and sheet surface texture changes during testing were discussed.