Numerical Simulation Analysis Of Bucket-shape Part Prepared By Friction Stir Backward Extrusion

With the ever-increasing technology development and production requirements,extruded profiles are headed in the direction of large scale integration,high precision sizes,complex and diversity.The fields of manufacture and application are developed,and already extended to the fields of aerospace,equip higher manufacturing and military industry.But currently,some problems such as extrusion energy,relative lower material utilization and efficiency become the internal causes that constraint the extrusion technology improvement.Friction air backward extrusion is a novel process to combine friction stir welding technology with extrusion process technology,which is complete extrusion process without heating.Friction stir backward extrusion,therefore,which has characteristics of saving energy,environmental protection,and no heating process.In this paper,based on the Bucket-shape Part by friction stir backward extrusion for the study,its deformation mechanism produced by this process makes theoretical analysis.And then to ABAQUS software as a platform,with forming FEM model for the characteristics of Bucket-shape Part by FSBE,a 3D elastic-plastic FEM model was established using the temp-disp,explicit module of the FEM software ABAQUS.And then,based on the model which had been built,the thermal-mechanical coupling numerical simulation of the forming process was carried out by finite element method,and the basic characteristic of temperature,stress,strain and metal flow pattern during the FSBE process of the Bucket-shape Part.The results show as the follows: The forming temperature of the billet is greatly improved,which is favorable for reducing the deformation resistance of the billet so that it is a facility for the extrusion deformation.Comparing with the traditional extrusion,the extrusion force during FSBE is obviously reduced.The equivalent strain is significantly increasing during FSBE,so this process can obtain larger effect of plastic deformation.Through the metal flow diagram,Spiral fibrous tissue got by FSBE can reduce the performance difference of the Bucket-shape Part in axial and circumferential direction.Then,the finite element method is used to explore the influence of the parameters of forming process(axial speed of the punch,friction coefficient,rotating speed of the punch)on the forming quality of Bucket-shape Part.It is found that the influence of extrusion speed and rotating speed of the punch on the result are relatively significant.On the basis of this,the orthogonal experiment is used to analyze the influence of the process parameters on the forming quality based on the single index under the multi-evaluation index.Then,the comprehensive analysis of the forming quality under the multi-evaluation index is carried out,and finally obtains the reasonably optimal matching process parameters.This paper analysed bucket-shape part prepared by friction stir backward extrusion.The results enrich the theory of extrusion forming technology,improve product quality and machining efficiency.It has guiding significance for actual production and processing.This paper provides a new idea for research and development of extrusion technology,and has important scientific significance and good prospect in application.