精铸件是用各种锻造方法取得的金属成型物件。用浇注、压射、吸入或其它浇铸方法写入预先准备好的铸型中，冷却后经打磨等后续加工手法后，所得到具有肯定形状，精密铸造尺度和功能的物件。铸件使用历史悠久。古代大家用铸件作和一些日子用具。近代，铸件首要用作机器零部件的毛坯，有些精细铸件，也可直接用作机器的零部件。铸件在机械产品中占有很大的比重，如拖拉机中，铸件分量约占整机分量的5070%农业机械中占4070%机床、内燃机等中达7090%各类铸件中，机加工精密零件以机械用的铸件品种多，形状杂乱，用量也大，约占铸件总产值的60%其次是冶金用的钢锭模和工程用的管道、以及日子中的一些东西。
Precision castings are metal formed objects obtained by various forging methods. By pouring, injection molding, suction molding, or other casting methods into a pre prepared mold, cooling and subsequent processing techniques such as polishing, an object with a certain shape, precision casting scale, and function is obtained. Castings have a long history of use. In ancient times, people used castings and some daily utensils. In modern times, castings were primarily used as raw materials for machine parts, and some fine castings can also be directly used as machine parts. Castings account for a large proportion of mechanical products, such as tractors, with castings accounting for about 50.70% of the total machine weight. In agricultural machinery, castings account for 40.70% of the total machine weight, while in machine tools, internal combustion engines, and other types of castings, up to 70.90%. Among various types of castings, precision machining parts are mainly used for machinery. There are many types of castings with messy shapes and large quantities, accounting for about 60% of the total output value of castings. Next are steel ingot molds for metallurgy, pipelines for engineering, and some things in daily life.
