电磁铸造大板坯不平直度形成机制的实验研究

依据电磁铸造大板坯铸造特点，设计了模拟大板坯变形过程的实验装置，通过动态和静态测量了Ａｌ－Ａｌ－４．５Ｃｕ合金（质量分数，％）板坯的不平直度的形成过程及最终的量值。考察了铸坯在不同宽厚比的条件下，不同工艺参数对平直度的影响，结果表明：板坯不平直度主要形成于板坯的凝固阶段；控制板坯表面温度是控制铸坯变形的关键因素。提高宽面在铸坯凝固过程的表面温度。改善宽面表面温度的不均匀性，可以有效地改善大板坯不平

EXPERIMENTAL STUDY OF CONCAVITY OF ELECTROMAGNETIC CASTING SLAB

A simple set-up has been designed to investigate the mechanism of pull-in of rolling faces of electromagnetic casting (EMC) slabs. The complete formation of concavity was recorded and was found that the concavity almost finished when the whole cross section solidified. Different casting parameters, such as pouring temperature, cooling water volume, have been changed to observe their influences on the final pull-in. It is concluded that the large pull-in of the rolling faces is because of the bending of solidified shell and the result of accumulation of deformation during its solidifying process. Increasing the surface temperature and decreasing the unevenness of it along the peripheral of cross section can effectively decrease the pull-in.