摘要
为满足大型支架“以铝代铁”的轻量化要求,设计了铝合金支架间接挤压铸造系统,完成了相应的数值模拟及工艺设计,并制作了相应的模具.采用Al-Cu-Mn合金材料,对支架进行了间接挤压铸造试制,分析了试制铸件缺陷形成的原因,并对T5热处理后的支架进行了力学性能和微观组织分析.结果表明:采取缩短循环时间、减少脱模剂水分等工艺改进措施,可以消除间接挤压铸造件的气孔和夹渣缺陷,获得质量良好的铸件;支架铸件各部位的平均抗拉强度和伸长率分别达388 MPa和8.7%,且力学性能分布较均匀;铸件微观组织致密,晶粒细化,晶粒尺寸小于0.08 mm,说明了所设计的间接挤压铸造系统和所选用的工艺参数的合理性.
In order to obtain large and light supporting frames by replacing spheroidal graphite iron with Al alloy, an indirect squeeze casting system of supporting frames was designed. The processing simulation and design were then carried out, and the dies of the frames were fabricated. Moreover, the supporting frame castings of Al-Cu-Mn alloy were trial-produced, and the defects in the trial production were analyzed. Finally, the mechanical properties and microstructures of the specimens from the castings with T5 heat treatment were discussed. The results show that, by shortening the cycle and reducing the moisture of lubricants, high-quality supporting frame castings without pores and inclusion can be fabricated, and that the castings are of good mechanical properties, dense microstructure and fine grains, whose average tensile strength, elongation and crystal size are 388 MPa, 8.7% and not more than 0. 08 mm. All these above-mentioned resuhs indicate the feasibility of the designed indirect squeeze casting system and the selected processing parameters.
出处
《华南理工大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2007年第3期16-21,共6页
Journal of South China University of Technology(Natural Science Edition)
基金
教育部科学技术研究重点项目(105138)
广东省自然科学基金资助项目(05006498)
