并且既能实现循环充填，又能实现挤压充填；必要时打开关门机构可实现二次充填。
It can not only carry out circulation packing, but also realize squeeze packing, and secondary packing can be done by opening the closing mechanism in demand.
结果表明： 等径道角挤压后二次加热等温处理是一种适于AZ91D镁合金的制坯方法， 加热温度对坯料的组织有很大影响。
The results show that reheating the AZ91D magnesium alloy extruded by an equal channel die is a kind of good method of preparing AZ91D magnesium alloy billets.
当加热温度和保温时间一定时，随着挤压次数的增加，二次加热组织的晶粒尺寸减小。
When remelted temperature and holding time are constant, with the increment of number times of extrusion the crystal grain becomes small.
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