An Evaluation of Interface Friction in Different Forming Models for Coated Steel Sheets

Formability and Fatigue Behavior of Tailor (Laser) Welded Blanks for Automotive Applications

“…The degree and type of lubrication can strongly influence the strain distribution in a stamping process. The expanded growth of zinc coated (galvanized) steel sheets for automotive stampings has triggered various studies [12,13] about the effect of interface friction with lubricants, die materials and temperature. The highly localized strain distribution reduces overall formability of the material.…”

“…Keeler et al [13] and Shi and Meuleman [12] have reported that the effect of lubricant is different among different types of materials or even for the same material from different suppliers. To analyze this effect, the draw bead simulator test was designed which allows the material to be pulled over a set of roller and fixed beads as shown in Figure 2.16.…”

“…A series of such tests was conducted by Shi and Meuleman [12] on different types of lubricants and automotive steels from different producers. A mix of bare, electro galvanized and hot-dip galvanized steels was tested with oil based, water based and a dry film lubricant.…”