Numerical Simulation Of Precision Forming Process For A Thin-walled Shell

A special-shaped shell size large,expensive materials,the use of ultra high strength steel production,the material has high strength and toughness,forming and processing difficulties,the current use of blanking-free forging-machining process for production of this technology in the process of production material utilization rate is only about 10%,the subsequent machining longer,high processing cost.To save costs,improve the efficiency of material utilization and production,based on the analysis of its structure characteristics,puts forward the design idea of production process with composite forming technology,the parts can be divided into two parts,respectively,forming,main forming process is: at the bottom of the blanking-forming-thin wall-part forming deep drawing,machining,precision forming manner to improve material utilization and efficiency.Forming on the bottom and established two kinds of forming process,using DEFORM-3D numerical simulation,according to the simulation results to find the appropriate blank size,at the same time comparing two schemes of load,equivalent stress and the forming quality under different friction coefficient,etc.,choose the higher material utilization,is more efficient to the bottom of the forming technology plan,To provide basis for subsequent experiments.Thin wall part of a forming when the required pressure is too great,requirements for equipment is too high,in this paper,through the way of increasing thin-wall part diameter of successive thinning,to reduce the process requirement for equipment,to prevent the thinning the metal flow to have deformation zone of deformation area,cant when thinning on the punch design,makes the metal lateral pressure,so as to make it flow to the lateral,Through numerical simulation,the equivalent stress and stroke load of billet under different Angle of inclined plane were obtained,and the most suitable Angle of inclined plane and thinning times were selected according to the requirements of equipment.According to the stroke load,forming quality and equivalent stress under different friction coefficients,the appropriate process parameters are selected.Which should be paid attention to when deep drawing parts of the lateral bump size,in this paper,by reducing diameter thin-walled parts,to prepare for the lateral bulging forming,in order to prevent the electrodes in the deep drawing process from the influence of the bending resistance and friction resistance leads to billet edge thinning,rounded corners in the design of concave die and convex and concave die clearance when appropriate choose larger value,ensure that the size of the lateral projection.Finally,according to the simulation results for experimental verification,through the mold design to solve the medium problems,and the problems in the process of the experiment put forward suggestions for modification,and verification,finally get the size of qualified extrusion parts.