高硅铝合金精密模锻技术的研究

Study of precision forging technology for high silicon Aluminum alloy

采用圆柱试样在Gleeble-1500热模拟机上进行高温压缩变形实验,研究了SC100-T6铝合金在高温塑性变形过程中应力的变化规律。结果表明,应变速率和变形温度的变化,强烈地影响着合金流变应力的大小,流变应力随变形温度升高而降低,随应变速率提高而增大。分析了活塞尾锻件结构尺寸和模锻成形的关键技术,并应用有限元软件模拟了热模锻成形过程,制定了模锻成形工艺。设计了合理的模具结构,通过工艺试验,得到了合格的精密锻件。

The mechanic behavior of SC100-T6 high silicon Aluminum alloy during high temperature plastic deformation was studied by isothermal compression of cylindrical specimens using Gleeble-1500. The experiment was carried out over of deformation temperature form 360℃ to 500℃, strain rate form 0.006s^-1 to 0.036s^-1. The result showed that the flow stress was controlled by both strain rate and deformation temperature, which the flow stress decreases with the increase of temperature, while increases with the increase of strain rate. The structure and size of piston tail forging and the key die forging technology were investigated, and the forming process at high temperature was simulated by thermo-mechanieal coupled mode. The rational die forging process was finished. At last, the qualified forge piece was obtained by test.