铝合金重力浇铸件的特点为：
The characteristics of aluminum alloy gravity casting are as follows:
1、模具成本较低，模具使用寿命长。
1. The cost of the mold is low, and the life of the mold is long.
2、生产效率低，从而增加了生产成本。
2, low production efficiency, thereby increasing production costs.
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、铝铸件内部气孔少，可进行热处理。
4, aluminum castings have fewer pores and heat treatment can be carried out.
5、产品表面光洁度不高，抛丸后易产生凹坑。
5, the product surface finish is not high, easy to produce pits after shot.
6、工艺较简单，不适合生产薄壁件。
6. The process is simple, and it is not suitable for the production of thin wall parts.
铝合金压铸件的特点为：
The characteristics of aluminum alloy castings are as follows:
1、产品表面光洁度好，一般可达Ra6.3甚至可达Ra1.6。
1, the product surface finish is good, generally up to Ra6.3 or even up to Ra1.6.
2、可生产薄壁件，加工余量小。
2. The thin-walled parts can be produced and the processing allowance is small.
3、生产效率高。
3. The production efficiency is high.
4、产品气密性高，铸件强度和表面硬度高，但延伸率低。
4. The product has high gas tightness, high strength and surface hardness, but low elongation.
5、模具成本较高，使用寿命短。
5. The cost of the mold is high and the service life is short.
6、不可热处理。
6. No heat treatment.
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、金属型（钢模）浇铸、消失模浇铸等。
Gravity casting of aluminum alloy refers to the process of casting aluminum liquid under the earth's gravity, and the gravity casting is divided into sand casting, metal mould casting, die casting and so on.
现在应用比较多的是金属模（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。
Now the most used is the metal mold (steel die) casting, its mold is made of heat resistant alloy steel, and the strength, size and appearance of the cast aluminum castings are all higher than those of other casting processes.
在产品选择何种工艺生产的时候，主要根据工件的壁厚做选择，产品壁厚大于8mm时，压铸会造成很多的气孔存于壁内，故而壁厚较厚的产品可以选择重力铸造工艺完成。
When the product selection is selected, the wall thickness of the product is more than 8mm, and the die casting will cause many holes in the wall, so the thick wall products can choose the gravitational casting process.