GH4169合金叶片制坯成形工艺数值模拟优化

Numerical simulation optimization of blocking forming process for GH4169 alloy blade

基于塑性有限元原理,应用Deform数值模拟平台,通过变形温度、压下量对挤杆成形及变形速度、摩擦条件对镦头成形的各场量进行深入研究,全面揭示了GH4169合金叶片制坯过程成形规律,并对其工艺参数进行优化。结果表明:适当的提升锻造温度有利于挤杆锻后温度的平稳分布;变形温度的增大使杆部各区域金属流动速度差异逐渐缩小,挤杆为非匀速变形过程;杆部从伸长成形到最终成形阶段,应变梯度先减小后大幅上升;随着变形速度的加大,镦头件等效应变速率越来越大且分布愈见均匀,所受最大主应力拉应力作用越强;摩擦因子越大,损伤值成递增式增加,榫头各截面位移场值相差较大,高摩擦因子下材料充型速度不均匀。

The laws of blocking process forming on GH4169 alloy blade were revealed and then process parameters were optimized respectively through the research of deformation temperature, pressure on extrusioned rod quantity of the forming and deformation speed, friction conditions on each fields of the head forming based on the plastic finite element theory and applying Deform numerical simulation platform. The results show that appropriately increasing of the extru- sioned rod forging temperature can make the end forging temperature to be stationary distributed; with increasing of deformation temperature to the rod, the flow speed difference between regional metals is reduced gradually, and rod- extrusion is the nonlinear deformation process; for the condition of the rod from elongation forming to the final shape stage, the strain gradient is reduced first and then rised sharply; with the increase of deformation speed, the equivalent strain rate of upset head part becomes bigger and bigger and the distribution is becoming more uniform, and the maxi- mum principal stress of tensile stress has the stronger effect. The greater the friction factor, the damage value becomes more increasingly, each section of tenons displacement field value has large differences , and under high friction factor, the material filling speed is uneven.