Influence Of Surface Parameters On Sail Surface Springback Under Force-displacement Separated Control

Process of multi-point forming has been widely applied to social productionbecasue of its strong flexibility. Since the force-displacement seperated controlcan effectively inhibit indentation and wrinkling defects, springback control hasbecome a major area of research in multi-point forming at present.In this paper, springback law of sail surface with double curvature is studied.First of all, results from theoretical derivation prove that the force-displacementseperated control has significant advantages in springback inhibition comparedwith conventional multi-point forming. Then characteristics of sail surface withdouble curvature are analyzed. In this thesis, ANSYS is adopted as the numericalsimulation platform and x, y sides of sail surface are adopted as research objects.Segmented curvature fitting is adopted to obtain the impact of radius of curvature,thickness, sail parameter on springback law. The results show that for springbackphenomenon of sail surface with double curvature, the two directions willinfluence each other, while the direction with bigger radius of curvature holdsdominant position. On the direction with bigger radius of curvature, thespringback increases with increasing radius of curvature, decreasing sheetthickness, and increasing sail parameter. On the direction with smaller radius ofcurvature, the springback increases with increasing radius of curvature, andincreasing sheet thickness. Rate of decrease for springback lines continue toaccelerate with increasing sail parameter.Sail Surface is tridimensional curved surface in space. It relies on the heightadjustment of the punch elements to achieve its shape. So it would be effective toguide practice if springback law is linked with height adjustment of punchelements.uz objstands for the amount change in the Z direction of punchelements’ corresponding location on the sheet.uz x,uz ystand for the amountchange in the Z direction of punch elements’ corresponding coordinates x, y. Therelationship between and, is studied in this paper. The resultsshow that is proportional to the sum of and. The coefficient kdecreases with increasing coordinates x, y. The rate of decrease changes fromseverely to smoothly, which is complied to binary quadratic polynomial regression equation.Finally, experiments of the force-displacement separated control are carriedon. The experiment data is analyzed from the aspects of sheet quality andspringback. Impact of different process parameters on springback are alsoanalyzed, which is in good agreement with the results of numerical simulation...