Research On The Process Of Conventional-shear Composite Spinning

Spinning is widely used to manufacture many kinds of rotational parts as a near-net forming method.Multi-pass spinning and shear spinning are two key processes which can be adopted to fabricate cone parts,cylindrical parts and numerous asymmetrical parts.According to the characteristics of cylinder-conical composite curved generatrix workpiece,the forming of thin-wall curved generatrix workpiece of aluminium alloy is studied at room temperature.The research contents are as follows: the influence of roller path on formability in conventional spinning;the determination of intermediate shape of cylinder-conical composite curved generatrix workpiece;the experiments of conventional-shear composite spinning.Single-pass and multi-pass conventional spinning are studied,and the roller path of single-pass and multi-pass are drawn.Then the effect of roller path on the formability is analyzed.The model of conventional spinning is established by applying the commercial FEM software Abaqus.And the comparative analysis of their metal flow evolution is carried out by the finite element method.It is found that one-pass roller path isn't conducive to putting down the flange gradually.And this will bring larger deformation resistance to cause cylinder wall fracture and reduce the formability of conventional spinning.In addition,contrast experiments of conventional spinning are devised.The size of blank is different while other parameters are the same.The result shows that the smaller blank leads to bigger circumferential strain,which has a beneficial effect on further deformation.According to the expression of theoretical strain in cone die-less shear spinning,the theoretical circumferential strain is zero,which is suitable for being intermediate shape.The blanks with 3mm thickness and two half cone angles(30°and 45°)are selected for experiments.And the distribution of thickness is measured.The intermediate shape of conventional-shear composite spinning is confirmed.Finally,the advantages of the method of conventional-shear composite spinning are proposed.The main factors which influence further spinning are analyzed,then the solution is proposed.