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针对镁合金半连续铸造过程中的熔炼过程、半连续铸造工艺以及小直径AZ31B半连续铸造铸锭容易形成的拉裂、夹杂缺陷进行分析。结果表明,为防止拉裂缺陷,应适当降低铸造速度和铸造温度,铸造速度130~140 mm/min,铸造温度710~720℃;适当加大水压使铸锭表面冷却均匀,清理结晶器内水垢以提高铸锭的冷却强度;结晶器工作面保持均匀润滑;正确安装结晶器和分配漏斗防止液流倾斜。精炼过程中采用分层加热,在炉子中形成正温度梯度,利于杂质沉降,铸造过程中及时打渣并避免渣子通过漏斗孔进入熔体,以防止夹杂缺陷的产生。
In view of the melting process, semi-continuous casting process and semi-continuous casting of magnesium alloy semi-continuous casting small diameter AZ31B semi-continuous casting ingot easy to form crack, inclusions defects were analyzed. The results show that in order to prevent cracking, the casting speed and casting temperature should be reduced properly. The casting speed is 130-140 mm / min and the casting temperature is 710-720 ℃. The water pressure is appropriately increased to cool the surface of the ingot and clean the inside of the mold Scale to improve the cooling strength of ingot; mold surface to maintain uniform lubrication; the correct installation of molds and distribution funnel to prevent flow tilt. In the refining process, stratified heating is used to form a positive temperature gradient in the furnace to facilitate the settlement of impurities. In the casting process, the slag is dumped in time and slag is prevented from entering the melt through the funnel hole to prevent inclusion defects.