响应面法优化镁合金杯形件旋转挤压参数的研究

Study on Rotary Extrusion Parameters of Magnesium Alloy Cup Parts Optimized by Response Surface Method

旋转挤压是一种新的大塑性变形方式,变形温度、进给速度以及应变速率是影响其变形的主要工艺参数。基于Box-Behnken试验设计,借助Deform-3D软件对不同工艺参数进行了有限元模拟,建立了旋转挤压工艺参数与杯形件应变均匀性、损伤值及应力值之间的预测模型。采用Design Expert软件对响应模型进行了回归系数及方差分析,并结合试验分析得到镁合金杯形件旋转挤压最优工艺参数:变形温度454℃,轴向进给速度1.5 mm/s,应变速率0.21s^(-1)。相应的最优响应值分别为:应变标准差1.150、损伤值0.0534、应力值20.7 MPa。利用Gleeble-3500热模拟机进行了试验验证,结果显示杯形件变形均匀,成形效果良好。

The rotary extrusion is a new type of large plastic deformation.The deformation temperature,feed speed and strain rate are the main technological parameters that affect the deformation.Based on the Box-Behnken test design,the finite element simulation of different process parameters was carried out with the help of Deform-3D software,and the prediction model between the process parameters and the strain uniformity,damage value and stress value of the cup parts was established.The regression coefficient and variance analysis of the response model was carried out by using Design Expert software,and the optimum technological parameters of rotary extrusion of magnesium alloy cup parts were obtained.They are deformation temperature of 454℃,axial feed speed of 1.5 mm/s and strain rate of 0.21 s-1.The corresponding optimum response values are strain standard deviation of 1.150,damage value of 0.0534 and stress value of 20.7 MPa.Test verification was carried out by using Gleeble-3500 thermal simulation machine.The results show that the deformation of the cup is uniform and the forming effect is good.