梳棉机的道夫轴、锡林轴铸件材质为HT30～54,轮廓尺寸Φ117×1420mm,要求铸件加工后不允许有任何缩孔,缩松、气孔、砂孔、渣孔等铸造缺陷。原工艺为半封闭式浇注系统,采用四道扁平内浇口引入铁水,平做平浇,冒口设置于两端,水平浇注。经机加工后发现有缩松、气孔和渣孔缺陷,铸件废品率一般在24～37%范围内。这种工艺还发现,从哪里引入铁水,哪里就有缩松、气孔,渣孔。虽然采取了必要的工艺措施,如在浇包中加入稀土除渣,在浇口杯底部加油砂过滤渣 Card doffer card, cylinder shaft material for the Xilinx HT30 ~ 54, the outline size Φ117 × 1420mm, requires casting after processing does not allow any shrinkage, shrinkage, porosity, sand hole, slag hole and other casting defects. The original process for the semi-closed casting system, the use of four flat gate into the hot metal, flat to do flat pouring set at both ends of the riser, the level of pouring. After machining found shrinkage, porosity and slag hole defects, castings rejection rate is generally in the range of 24 ~ 37%. This process also found that where the introduction of hot metal, where there is shrinkage, porosity, slag hole. Although the necessary technical measures taken, such as adding rare earth slag in the ladle, the bottom of the pouring cup oil sand filter residue