Multi-Objective Optimization Of Extrusion Forming Parameters Of Aerospace Inner-Ring Cabin For Aerospace

Magnesium alloy inner-ring cabin are typical lightweight structural parts and have a wide range of applications in the aerospace industry.The traditional processing methods have high rejection rate,poor performance,high cost,low life,and are difficult to meet the requirements of lightweight and high-performance components.Research and development of new processing methods need to be solved.In this paper,from the aspects of rotary extrusion process and metal plastic deformation principle,the multiobjective optimization method combined with grey correlation-fuzzy theory is used to optimize the process parameters of numerical simulation of rotary extrusion forming,and the inner ring forming parts are formed.Further research on quality.The research content of this paper is as follows:Firstly,the research on the inner-ring cabin is carried out,and the process of rotary extrusion forming under two different punch structures is proposed and compared.The Deform-3D finite element analysis software is used to rotate the inner ring shell of AZ80 magnesium alloy.The press-plastic forming process was studied.According to the five factors of friction coefficient,axial extrusion speed,rotational speed,extrusion temperature and fillet radius,orthogonal experiments were designed.Each process corresponds to 25 combinations.Secondly,in order to evaluate the deformation quality of the extrusion,the deformation quality evaluation factor based on strain,folding angle and damage factor is proposed,and combined with the method of grey correlation analysis and fuzzy reasoning,the quality of rotary extrusion is given.The evaluation factor is the target optimization strategy:(1)orthogonal test;(2)finite element simulation;(3)calculation of grey correlation coefficient;(4)grey correlation degree calculation based on fuzzy reasoning;(5)calculation range difference,Perform an analysis of variance and give the results of the assessment.According to the numerical simulation of the forming process of the inner-ring cabin of AZ80 magnesium alloy,the multi-objective optimization is carried out,and the primary and secondary relations of various factors on the comprehensive deformation quality index are obtained,and the optimal process parameter combination is obtained.Finally,based on the optimized parameter combination,the control forming molds of each process were designed,and the verification experiment of AZ80 magnesium alloy inner-ring cabin was carried out.The uniform quality magnesium alloy inner ring rib members satisfying the design requirements were produced.This also provides strong technical support in the aerospace industry.