硅溶胶铸造具有尺寸精度高、表面质量好等优点，是一项被广泛应用的少、无切削的先进工艺，采用硅溶胶铸造方法可大量俭省机床设备和加工工时，还大幅度节约金属原材料。硅溶胶铸造在精密铸造领域中是一种被广泛运用的精密铸造方式，这种精密铸造方式有效降低了成本，提高了精密铸造企业的竞争力。浇注成型是硅溶胶铸造中一个最重要的步骤，那么硅溶胶铸造有哪些常见的浇注方法呢？
Silica sol casting has the advantages of high dimensional accuracy and
good surface quality. It is a widely used advanced process with less and
no cutting. Using silica sol casting method can not only save a lot of
machine tools and processing hours, but also greatly save metal raw
materials. Silica sol casting is a widely used precision casting method
in the field of precision casting. This precision casting method
effectively reduces the cost and improves the competitiveness of
precision casting enterprises. Casting is the most important step in
silica sol casting. What are the common casting methods of silica sol
casting?
1. 压力下结晶,将型壳放在压力罐内进行浇注，结束后，立即封闭压力罐，向罐内通入高压空气或惰性气体，使铸件在压力下凝固，以增大铸件的致密度。
1. Crystallize under pressure. Place the mold shell in the pressure tank
for pouring. After that, immediately close the pressure tank and inject
high-pressure air or inert gas into the tank to solidify the casting
under pressure, so as to increase the density of the casting.
2.真空吸气浇注,将型壳放在真空浇注箱中，通过型壳中的微小孔隙吸走型腔中的气体，使液态金属能更好地充填型腔，复制型腔的形状，提高铸 件精度，防止气孔、浇不足的缺陷。这种方法国外较常见。
2. Vacuum suction pouring: put the mold shell in the vacuum pouring box
and suck the gas in the mold cavity through the small pores in the mold
shell, so that the liquid metal can better fill the mold cavity, copy
the shape of the mold cavity, improve the casting accuracy and prevent
the defects of insufficient pores and pouring. This method is more
common abroad.
3.定向结晶,一些熔模铸件如涡轮机叶片、磁钢等，如果它们的结晶组织是按一定方向排列的柱状晶，它们的工作性能便可提高很多，所以熔模铸造定向结晶技术正迅速地得到发展。
3. Directional crystallization. Some investment castings, such as
turbine blades and magnetic steel, can improve their working performance
if their crystalline structure is columnar crystals arranged in a
certain direction. Therefore, the directional crystallization technology
of investment casting is developing rapidly.
