基于CAD/CAE的前翼板支架拉延模设计

Draw die design of front wing support based on CAD/CAE

运用CAE分析软件对前翼板支架成形过程进行了仿真分析,预测了拉延成形过程中的起皱和拉裂等缺陷,模拟分析得出前翼板支架起皱分析图、厚度变化图和成形极限图,并依此来判定其成形效果。运用正交试验法研究了压边力、冲压速度、摩擦因数、模具间隙和拉延筋阻力系数5个工艺参数对成形结果的影响,获得了工艺参数优化组合为:压边力1800 kN、冲压速度2000 mm·s^(-1)、摩擦因数0.16、模具间隙1.1 t、拉延筋阻力系数0.5,优化后产品最大减薄率为20.4%,最大增厚率为7.5%,符合产品要求。利用UG WAVE技术,采用自顶向下的装配建模,快速设计出了前翼板支架拉延模具结构,该技术符合参数化产品设计过程和规则,使模具设计和修改更加便利。最后在试模阶段对前期工艺方案进行了验证,得到的试模结果和仿真分析结果基本保持一致,产品最大减薄率为21.3%,最大增厚率为8.1%,均满足成形要求。

The forming process of front wing support was simulated using CAE analysis software,and the wrinkling and cracking and other defects in the drawing process were predicted.The wrinkling analysis diagram,the thickness variation diagram and the forming limit diagram of the front wing support were obtained by simulation analysis to judge the forming effect.The influence of five process parameters including blank holder force,stamping speed,friction factor,die clearance and drawbead resistance coefficient on the forming results was studied using orthogonal test method.The optimal combination of process parameters is obtained as follows:blank holder force of 1800 kN,stamping speed of 2000 mm·s^(-1),friction factor of 0.16,die clearance of 1.1 t,drawbead resistance coefficient of 0.5.The maximum thinning rate of parts after optimization is 20.4%,and the maximum thickening rate is 7.5%,which accords with the requires ment of parts.Using UG WAVE technology and top-down assembly modeling,the drawing die structure of front wing support was quickly designed.This technology conforms to the parametric product design process and rules,which makes the die design and modification more convenient.Finally,the preliminary process scheme was verified in the mold test stage.The test results are consistent with the simulation analysis results.The maximum thinning rate of parts is 21.3%,and the maximum thickening rate is 8.1%,which meet the forming requirements.