Study On Process Of Incremental Sheet Forming Of Concave Cone

Sheet metal incremental forming technology,as a new flexible machining technology,which can make full use of material plasticity.Concave cone is a kind of common sheet metal parts.The traditional forming methods needs to use multiple sets of dies,which has the disadvantages of long process cycle,insufficient flexibility,high production cost.The Incremental Sheet Forming of concave cone can make up for the shortcomings of the traditional forming process;which can meet the actual needs of concave cone forming.Based on ANSYS/LS-DYNA software,the finite element model of the concave conical part was constructed,which takes concave cone as the research object.The incremental forming process of concave cone was studied by numerical simulation and physical experiment.Taking the specified control point X as the control parameter,the forming critical state and the forming limit state of the concave cone of the ellipse,parabola and hyperbolic are studied respectively under a single pass.The X critical and X limit of these three concave busbar conical parts are obtained.The forming regularity of different generatrix at the critical time of X is studied.The uniform forming angle is the essence of the rule of uniform wall thickness to thinning band in X critical case.On this basis,the influence of different process parameters on the wall thickness distribution and forming quality is also studied,the better process parameters are obtained.In the Multipass study,two stage,three stage and four stage were designed to improve the uniformity of wall thickness.For the same shape and different sizes,the path scaling was studied.The point support forming is easy to appear the instability of the parts,and the forming quality is not good.