The Effect of Die Materials and Lubrication on Punch Stretching and Drawing Forces of Cold-Rolled and Zinc-Coated Steels

Recent trends in the automotive industry have resulted in an increased use of zinc coated steels. One of the concerns arising from this change is the effect of frictional differences of these coatings on the stamping process. This is particularly true for prototype or soft tool programs which are frequently used to validate both product and tool design. These concerns were addressed by evaluating both punch stretchability and drawing forces using limiting dome height and drawbead simulation tests. A variety of conditions were investigated including test speed, tool material, lubricant, strain state, and coating type. The results of this investigation show that significant interactions occur between zinc coatings, tool materials and lubricants. Speed was significant only for drawing forces.

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