Analysis of Factors influencing Galvanized Sheet Friction based on Orthogonal Experiments

Abstract

During forming process of sheet metal, friction phenomenon occurs everywhere. Galvanized sheet is the combination of substrate and zinc coating, which are two different materials of different properties. Compared with ordinary cold-rolled steel sheets, friction during forming process of galvanized sheet is more complicated. Factors like load, velocity, etc. have different effects. In this paper, effects of zinc coating, velocity and load on galvanized sheet friction coefficient were researched based on orthogonal tables with using friction wear tester. The results show the following conclusions. Zinc coating has great effect on galvanized sheet friction, friction coefficient of zinc-coated sheet is greater than that of bare board under low load (0.3~1 N), but smaller than that of bare board under high load (1~5 N). Galvanized sheet friction coefficient also changes when load or velocity changes, with load increases, it first increases and then decreases; with velocity increases, it first increases and then decreases. Mechanism of the influence rules above was simply analyzed. Significance of the three factors above could also be seen. Under low load, effect of zinc coating on galvanized sheet friction coefficient is the greatest, followed by that of load, and finally that of velocity, but none of them is significant; under high load, effect of zinc coating is significant, those of velocity and load are not significant.