摘要
采用挤压铸造法,通过专用模具,对铝合金薄壁壳体件进行了初步成形研究,探讨了模具温度、浇注温度、压力大小及保压时间等对制件成形的影响,并检测了制件的拉伸性能,微观结构以及断口特征等.结果表明,浇注温度是成形成功与否的关键,提高浇注温度有利于充型,720～740 ℃之间是充型的最佳温度区间.在该温度下成形,制件塑性、强度都能满足使用要求.同时,挤压铸件微观晶粒细小,无枝晶产生;断口呈现韧性特征.
Thin-walled aluminum alloy shell was prepared by squeezing casting in a special mould.The effects of preheated temperature of mould,pouring temperature,pressure and holding pressure time on deformation of the components were expounded,meanwhile,the tensile properties,microstructure and fracture morphology of the components were observed.The results show that increasing temperature is favorable for the filling of the liquid aluminum alloy,and the optimized pouring temperature is 720~740 ℃.The plasticity and strength of the components poured at 720 ℃~740 ℃ can meet the requirements,and the microstructure of the components exhibits fine grain size and dendrite-absence as well as tough fracture features.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2007年第3期194-196,共3页
Special Casting & Nonferrous Alloys
关键词
铝合金
薄壁件
挤压铸造
成形工艺
Aluminum Alloy,Thin-walled Component,Squeezing Casting
