Numerical Simulation And Experiment Analysis For Spinning Of Missile-head Shell

Spinning forming as an important part of metal plastic forming,because of its hing machining efficiency,high material utilization,great performance and precision,has been widely used in the aerospace products,chemical industry and civilian manufacture.Since missile-head shell as an indispensable part,it is significant to analyze its power spinning shaping principle and quality.This article simulate the power spinning shaping process of missile-head shell based on element analysis in ABAQUS/Explicit.And analyze its stress and strain distribution of shaped body.Furthermore,this article optimize the spinning process parameters using orthogonal experiments.Finally,analyze the quality of shaped missile-head shell by experiments.The main research contents as following:(1)analyze the sine-regular of curved generatrix part in the process of power spinning.Research the theoretical distribution characteristics of shaped missile-head shell wall thickness.The results show that: the wall thickness of missile-head shell is changed an it became thin equably when the half angle of missile-head shell diminish.(2)Build a 3D finite element model of missile-head shell power spinning in ABAQUS/Explicit.Analyse the stress and strain distribution of shaped body and especially researches the wall thickness in axial and circumference direction of shaped body.The result show that: the maximum value of stress and train always lies in the top of shell,and in the contact of the blank and rollers,the value of stress is higher.Beside the top area,the strain present a uniform decreasing state along the axial direction of missile-head.And the actual thickness,which have a little deviation from the theoretical thickness,also present a decreasing state along the axial direction.While the thickness in circumference direction shows a approximate homogeneous state.(3)Optimize the process parameters by orthogonal experiments.Five factors and five level of each factor are given.And a total of 25 groups of experiments were designed.The thickness deviation degree and the uniformity degree of thickness in axial direction are designed as evaluating indicators.Make a range analysis to that two indicators.And make a conclusion of each factors' influence degree to indicators.Moreover,the experimental results have been analyzed through response surface methodology,a mathematical model of response surface is built to optimize the process parameters using the function of fmincon in MATLAB.Finally a group of optimal process parameters were given:Mould' rotational speed is min/r143;feed rate of rollers are r/mm31.0;installation angle of rollers are 65.24?;fillet radius of roller are mm75.6;thickness of roughcast is mm3.1 ?(4)Based on the optimal process parameters,the spinning test was taken.And the microscopic structure analysis,tensile test,hardness test of the finished part are made.The results show that: the grain crystal became fine and well-distributed,metal fiber became more acerose and well-arrangement.The yield limit and tensile strength became distinctly approved than semifinished product.The hardness approved 57.4% than semifinished product.