压缩机缸体制造

发布时间:2011-10-14

压缩机缸体是压缩机的核心关键件,铸件的外形尺寸为430 mm×345 mm×575 mm,特点是缸体孔面有大的机加工平面,并且周围分布着承受压力的水道和气道,铸件的主要壁厚为10 mm,缸筒处的壁厚为15mm,要求气道和水道的缝隙公差为-0.4 mm,技术要求很高,铸造难度相当大。

铸件收缩率取1.2%,不设补缩冒口,在底面和内腔分别留和4和10 mm的加工余量,采用底注式浇注工艺,铁水最后流到的地方设溢流冒口,压缩机缸体发兰盘的上平面也设溢流冒口。

(1)浇注系统的设计根据消失模铸造的特点和铸件结构特点;确定采用底注式浇注系统。根据水力学计算

公式计算出内浇道的最小截面积,并在最小截面面积上的基础上增大30%。采用2个扁平内浇道,内浇道和横浇道整体泡沫成型,直浇道采用空心浇棒。

(2)设置低温铁水溢流冒口因为铸件内腔复杂,铁水流经的路线长,最后到达的地方铁水温度很低,须把低温铁水排出铸件外,故设置溢流冒口。溢流冒口还起到排渣作用,同时考虑到铁水由下而上,由内到外的流动方向,所以在铸件的发兰盘的上平面也设置了溢流冒口。

(3)涂料选择涂料,采用浸涂的方法,涂层厚度为1.0~1.5 mm,涂料的烘干温度在40~45℃之间,干燥后涂料表面要求无裂纹和汽泡。

(4)装箱将涂好涂料、检查合格的泡沫模型小心的放到砂箱内,采用流动性和透气性好、耐火度高的型砂,边振动边加砂直至填满砂箱,然后覆盖薄膜,最后安放浇口杯。

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压缩机缸体制造