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一、概述负压铸造法是最近几年出现的一种新的造型工艺。其主要特点是:用不含水份、粘结剂或其他附加物的普通干黄砂作造型用砂,用塑料薄膜作密封材料;用真空泵使砂型处于一定的负压状态,形成型腔。我厂在华中工学院的帮助下,运用负压铸造方法,生产一吨叉式车用475C型汽油机的气缸体和气缸盖。气缸体的工艺参数是:外形尺寸为450×220×230(毫米),毛重55公斤,材料为HT24-44,最大壁厚30毫米,最小壁厚5毫米。气缸盖的工艺参数是:外形尺寸为
First, an overview of negative pressure casting method is the emergence of a new modeling process in recent years. Its main features are: with water, binders or other additional ordinary dry sand for modeling sand, plastic film for the sealing material; with a vacuum pump sand at a certain negative pressure to form the cavity. I plant with the help of Huazhong Institute of Technology, the use of negative pressure casting method to produce a ton forklift 475C gasoline engine cylinder block and cylinder head. Cylinder body process parameters are: Dimensions 450 × 220 × 230 (mm), gross weight 55 kg, the material is HT24-44, the maximum wall thickness of 30 mm, the minimum wall thickness of 5 mm. Cylinder head of the process parameters are: Dimensions