铝合金重力铸造是指铝液在地球重力作用下注入铸型的工艺，重力铸造又分为：砂型浇铸、金属模（钢模）浇铸、消失模浇铸等。
Gravity casting of aluminum alloy refers to the process of injecting molten aluminum into the mold under the action of the earth's gravity. Gravity casting is divided into sand mold casting, metal mold (steel mold) casting, lost foam casting and so on.
现在应用较多的是金属模（钢模）浇铸，其模具采用耐热合金钢制作而成，浇铸出来的铝铸件强度、尺寸、外观等都高于其他铸造工艺的铸件。
At present, the metal mold (steel mold) casting is widely used. The mold is made of heat-resistant alloy steel. The strength, size and appearance of the aluminum castings are higher than those of other casting processes.
重力铸造的铝液一般采用手工倒入浇口，依靠金属液的自重充满型腔、排气、冷却、开模到得到样品，其工艺流程一般为：铝液熔炼、浇料充型、排气、冷却、开模、清产、热处理、加工。
In gravity casting, aluminum melt is usually poured into the gate by hand, and it is filled with cavity, exhaust gas, cool and open mold by the weight of liquid metal. Its technological process is generally as follows: molten aluminum smelting, casting filling, exhaust gas, cooling, open mold, clear production, heat treatment and processing.
铝合金重力浇铸件的特点为：
The characteristics of aluminum alloy gravity casting parts are:
1、产品表面光洁度不高，抛丸后易产生凹坑。
1, the product surface finish is not high, easy to produce pits after shot.
2、铝铸件内部气孔少，可进行热处理。
2, aluminum castings have fewer pores and heat treatment can be carried out.
3、产品致密性低、强度稍差，但延伸率高。
3, the product has low density and poor strength, but the elongation is high.
4、模具成本较低，模具使用寿命长。
4, mold cost is low, mold service life is long.
5、工艺较简单，不适合生产薄壁件。
5, the process is relatively simple, and is not suitable for producing thin-walled parts.