A Study Of Dynamic Mechanics On Tube Hydroforming Of Thin Thickness Metal

A danamic research on thickness reduction of metal tube hydroforming is studied in this article.First of all,introduces current situation ,development trend and application of the tube hydroforming in recently years. Illuminate technic principle,innovation and characteristics of the tube hydroforming.Secondly,combine with the theory of elastic-plastic mechanics,analyze constitutive equation's three basic elements of plastic deformation:yield condition,strengthen condition and qualitative relation between stress and strain.According to the characteristic of tube have been suffered press,analyze the elastic-plastic mechanics of the suffered equalization press cylinder.Find the equation of calculating stress,strain and displacement.With the research status quo of the thin thickness metal tube hydroforming, point out the essentiality that study on simulation of tube hydroforming.Finally,adopt two modeling methods to simulate tube hydroforming:cross section and vertical section.Cross section simulates two different thickness tunes,reach a conclusion that stress is distribution equality in the radial ditection on the thin tube(out-diameter is 18mm,thickness is 0.5mm), but we think the thick tube(out-diameter is 18mm,thickness is 3mm)isn't same to thin thickness metal tube.And work out the law of stress change in the elastic stage,elastic-plastic stage and plastic stage.And compare finite element simulate and theory,the conclusion show that the both is accordant.Vertical section simulates the tube deformation process,analyses the distribution law of stress,strain and displacement on the metal tube.Analyse how pressure and speed affect the tube deformation, if pressure and speed is too large or too small,that doesn't shape up the reasonable part figure,so we should choose reasonable pressure and speed.Afer the metal tube hydroforming,observe metallography tissue of the deformed metal material ,indicate the law of changes of the metallography tissue.Through the upwards,for the super-thin thickness metal tube,provide some significance economic base for deformation technique of metal tube.