铝合金大型薄壁平板件反重力铸造技术研究

Research on Anti-gravity Casting Technology for Large Thin-walled Aluminum Alloy Plate Parts

为实现铝合金大平板件的砂型铸造,获得高质量铸件,结合模拟仿真方法,研究了冷铁分布、保压增压值、铸件与冷铁厚度对平板铸件缺陷形成的影响。结果表明:冷铁分布、增压保压值、以及铸件与冷铁厚度均对平板铸件缺陷的形成影响明显。当冷铁之间存在较大间隙时,间隙处易形成缩松缺陷;增大保压值可有效降低缺陷形成倾向;增压保压值在一定条件下,当铸件厚度或冷铁厚度一定时,减小冷铁厚度或增大铸件厚度,可有效降低缩松缺陷的形成。

For casting the large thin-wall plate of aluminium alloy with high quality,the effect of chill distribution,boost pressure,and the thickness of the casting and chill on the formation of casing defect was studied.The results show that,chill distribution,boost pressure and the thickness of the casting and chill has significant impact on the formation of the casting defect.When the gap between chills was bigger,the location of the gap can easily form the shrinkage porosity.Increasing the boost pressure can decrease the formation of defect.When the chickness of the casting or the chill was fixed,decreasing the chickness of the chill or the casting can decrease the formation of defect.