大型铝合金铸锭均匀化镦拔优化与模拟

目的给实际生产中大型铝合金铸锭的镦拔提供一套较为全面系统的工艺优化依据。方法提出以理论变形量计算为指导的镦拔参数优化方法:首先将变形过程视为均匀变形,计算坯料镦拔的理论等效应变参数公式;然后针对给定的最终坯料尺寸,优化镦拔过程参量,使理论等效应变均值最大;最后根据优化的镦拔过程参量数值,模拟镦拔工艺过程,对比等效应变的理论均值和模拟均值。结果随着镦拔次数的增加,等效应变均值不断增加,理论值与模拟值偏差逐渐减小,但应变均匀性越来越恶化。结论为得到满足均匀性条件的最终坯料提供了一个有效手段。

Uniformity Upsetting-stretching and Simulation of Large Size Aluminum Alloy Casting

The paper aims to put forward a process optimization basis in combination with upsetting-stretching of large size aluminum alloy casting in actual production. The optimization method for upsetting-stretching was proposed based on calculation of theoretical deformation: first, the deformation process was taken as a homogeneous deformation to calculate systemic effective strain parametric formula of blank; then, parameters during upsetting-stretching process were optimized according to the final given size of blank to achieve the biggest effective strain; at last, deformation process was simulated according to the calculation results and the theoretical effective strain was compared with calculation effective strain. As the times of upsetting-stretching increased, the effective strain increased and deviation between value of calculation and simulation decreased; while the uniformity of the forging became worse. The method provides a useful way to get a forging piece which satisfies the requirements of uniformity.