锌铝合金热型连铸的工艺方法

就热型连铸工艺条件下对具有共晶、包晶和共析转变的5种典型锌铝合金的连续定向凝固进行了研究,找出了各种合金的最佳工艺参数配合范围.研究表明引锭操作是热型连铸工艺的关键环节,型口温度、拉铸速度、冷却条件、合金成分和液位压头对铸锭表面质量有直接影响,型口位置的固液区存在着热和力的平衡.只有通过调节工艺参数,维持固液界面的良好位置,才能拉铸出表面光滑的线材.

Technique of producing ZA alloys by heated mold continuous casting

The continuous directional solidification technique of 5 kinds of special ZA alloys with eutectic, eutectoid and peritectic transformations under the condition of continuous casting by heated mold was studied. The optimum fitting range of technique factors in each alloy is found. The results show that the operation of guiding ingot is the key of the technique to produce directional solidification ZA alloy line by heated mold in continuous casting method. Outlet temperature, pulling speed, cooling condition, alloy composition and pressure head have direct influences on the surface quality of ingot. There is a balance between heat and force in the two phase zone of solid and liquid. Only adjusting technique factors with the balance and keeping a good place of the interface between solid and liquid, can the smooth ZA alloy line be continuously pulled out.