260T擦摩压砖机螺母(如图1),铸件毛重(加冒口)约350kg,材料为ZQAL9—4。这种铝青铜含铝8—10%,在熔炼和浇注过程中极易产生干性粉末状不易撇除干净的氧化渣,随合金液流入铸型,使铸件造成夹渣和气孔缺陷。为了避免缺陷,我们曾采用底注,在浇口中放置砂芯过滤器,其尺寸为:厚25mm,孔眼直径φ7mm,孔眼数量为28个,安放在集渣包下部(如图2)。这种砂芯去滤器对提高铸件质量有一定作用,但是因砂芯 260T rub friction brick machine nut (Figure 1), casting gross weight (plus riser) about 350kg, the material is ZQAL9-4. This aluminum bronze containing aluminum 8-10%, easy to produce in the process of melting and pouring dry powder not easy to remove the clean oxide slag, with the alloy liquid into the mold, so that the casting slag and porosity caused by defects. In order to avoid defects, we have used the bottom note, sand core filter placed in the gate, the size is: 25mm thick, hole diameter φ7mm, the number of holes 28, placed in the lower part of the slag package (Figure 2). This core filter to improve the quality of castings have a certain effect, but because of sand core