摘要
采用自主研制的双向多级速电磁搅拌装置、浆料转移工具和涂料、阶梯板流变性能试件和半固态合金压铸模具,开发出一种半固态合金浆料制备系统与工件成形系统分离的铝合金流变成形技术。结果表明:该技术可在20～25 s内制备出形状因子为0.85左右,晶粒尺寸为70～80μm(空冷尺寸)的A356合金半固态浆料,实现制浆设备与成形设备“一对一”配套;可在浆料温度下降不超过3℃的情况下,实现合金浆料从制备系统到压铸机压室的平稳输送;试件的抗拉强度和伸长率分别比液态压铸提高11.6%～18.2%和42.5%～50%;该流变成形技术与传统的成形技术衔接简便。
Using the reversible multilevel-speed electromagnetic stirrer, the slurry transfer tool and its coater, the thin plate sample with five steps and the rheocasting mould, all of which are independently developed, a new rheoforming processing of AI alloy with slurry preparation systems and component shaping systems apart was exploited. The results show that the semi-solid A356 alloy slurry with shape factor of about 0.85 and particle size of 70-80 μm （in air-cooling state） could be prepared in 20-25 s to fully meet the production rate of high pressure die casting. The slurry could be smoothly transferred from the slurry preparation equipment to the rheocasting shot chamber when the temperature of slurry is decreased by 3 ℃ or less, the tensile strength and elongation of the rheocasting samples can be increased respectively by 11.6%-18.2% and 42.5%-50% compared with the traditional liquid die casting ones. The rheoforming processing has close affinity with the traditional hot working processes.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2007年第2期239-247,共9页
The Chinese Journal of Nonferrous Metals
作者简介
通讯作者：唐靖林，副教授，电话：010-62772502；E-mail：tangjl@mail．tsinghua．edu．cn
