Experiment And Simulation Study Of Friction Characteristics Of Zinc-coated Sheet In The Stamping Process

Zinc coating in the surface of ordinary sheet called zinc-coated sheet, it has good corrosion resistance and was used in the automotive, construction, household appliances industry. However, zinc coating and basic sheet have significantly different characteristics, so compare with ordinary sheet, it has great different in stamping features. At the same time, in the process of stamping, powdered peel, flake off, wear, broken, drum and other forms of package failure will appear. With the development of production and technology, stamping technology of ordinary sheet has matured, but the research of zinc-coated sheet just confined to the preparation and use of zinc coating.The friction of sheet is complex in the process of stamping and it has great impact on sheet forming of success or failure. But the unified conclusion has not obtained in the study of friction in the process of sheet forming.Therefore, do researches in friction of zinc-coated sheet in the process of stamping has good theoretical and practical significance.This article analysis the contact and the friction theoretic of sheet stamping forming and do the pin-on-disk friction test and the cupping test with zinc-coated sheet. Then use software to simulate cupping forming to analysis the friction property of zinc-coated sheet on the stamping forming. The following are the specific of research:(1) Analysis the impact of stamping velocity and lubrication conditions on the cupping value of zinc-coated sheet by cupping test. Then do the pin-on-disk friction test with zinc-coated sheet and analysis the effect of levels of contact pressure,stamping velocity and zinc coating on the frictional coefficient of zinc-coated sheet by orthogonal test and variance analysis .(2) Tiebreak contact was used to establish the model of zinc-coated sheet and simulate the cupping test by stamping software under this model. By the results could show the movement of zinc coating in the process of forming, so it has benefit to analysis the impact of zinc coating on the process of stamping. Analyses the effect of frictional coefficient on the zinc-coated sheet process stamping forming by simulate results.(3) With combine the finite element simulation and the cupping test to reverse obtained the friction coefficient in process of zinc-coated sheet forming. Analyses the impact of stamping velocity and lubrication conditions on the friction coefficient and the relationship between friction coefficient and cupping value by simulate results.