Research On The Spinning Forming Method Of Thin-walled Parts With Non-circular Cross-section

The traditional spinning technology is mainly used for the forming of thin-walled rotary parts.The emergence of spinning technology for thin-walled parts with non-circular cross-section breaks through the limitations of traditional spinning technology,and provides a new process method for the forming of thin-walled parts with non-circular cross-section.At present,the non-circular spinning forming method is usually to spin the sheet metal into the non-circular conical part with the help of the mandrel.The type of the part obtained is single and the processing flexibility is low.Based on the motion principle of swing guide bar mechanism,a new non-circular spinning forming method is proposed in this paper.This method can form cylindrical blank into non-circular thin-walled parts without taper in the case of no mandrel.Based on this method,the spinning wheel movement track,numerical simulation and spinning process in the process of non-circular spinning forming are studied in depth.The research content of this paper proves the feasibility of the new non-circular spinning forming method,enriches the spinning forming methods of thin-walled parts with non-circular cross-section,and has great significance to promote the development of spinning forming technology.The main contents of this paper are as follows:1)Based on the classification of the boundary of the non-circular section,the trilateral arc,quadrilateral fillet and ellipse section are selected as the representative of the non-circular section to study the non-circular spinning forming,and the geometric characteristics of these three types of shapes are analyzed;The new non-circular spinning forming method is introduced,and compared with the traditional method,the relationship and difference between them are analyzed;The spinning machine based on the new non-circular spinning forming method is introduced,and the overall scheme of non-circular spinning forming is drawn up.2)The track of the spinning wheel in the process of non-circular spinning is studied.The mathematical model of the track of the spinning wheel in the spinning process of the three kinds of thin-walled parts with non-circular cross section is established by combining the high pair low generation with the analytic method.The correctness of the model is verified in MATLAB,and the exact correspondence between the wheel disk angular displacement and the part angular displacement is obtained.Non circular spinning is studied by numerical simulation.The finite element model of non-circular spinning is established in ABAQUS software,and the spinning simulation results of the above three kinds of thin-walled parts with non-circular cross-section are obtained;Meanwhile,The simulation results are analyzed,and the equivalent stress,equivalent strain and three-dimensional strain distribution of the three kinds of spinning parts are summarized;Meanwhile,the change of the spinning pressure in the forming process of the trilateral arc section with equal distance is analyzed.3)The spinning process of thin-walled parts with trilateral arc section is studied by using the method of numerical simulation and orthogonal experiment.The influence of main process parameters(the axial feed ratio of the spinning wheel,spindle speed of parts,fillet radius of roller and rolling reduction)on the forming quality of parts and the optimal combination of process parameters corresponding to each index are obtained;The multi pass spinning of thin-walled parts with quadrilateral fillet and elliptical cross-section is studied.It is found that the variation of equivalent stress and strain and the variation of wall thickness of the two parts are similar after each pass spinning.