铸造是获得精准尺寸铸件工艺的总称。相对于传统砂型铸造工艺，精密铸造获的铸件尺寸更加精准，表面光洁度更好。
Casting is the general term for the process of obtaining accurate size castings. Compared with the traditional sand casting process, the casting size obtained by precision casting is more accurate and the surface finish is better.
基本概念
Basic concepts
它包括：熔模铸造、陶瓷型铸造、金属型铸造、压力铸造、消失模铸造。
It includes investment casting, ceramic mold casting, metal mold casting, pressure casting and lost foam casting.
其中较为常用的是熔模铸造,也称失蜡铸造：选用适宜的熔模材料(如石蜡)制造熔模；在熔模上重复沾耐火涂料与撒耐火砂工序，硬化型壳及干燥；再将内部的熔模溶化掉，获得型腔；焙烧型壳以获得足够的强度，及烧掉残余的熔模材料，；浇注所需要的金属材料；凝固冷却,脱壳后清砂，从而获得高精度的成品。根据产品需要或进行热处理与冷加工和表面处理。
Among them, investment casting, also known as lost wax casting, is more commonly used: select appropriate investment materials (such as paraffin) to make investment casting; Repeat the process of dipping refractory coating and sprinkling refractory sand on the mold, hardening the mold shell and drying; Then melt the internal mold to obtain the cavity; Bake the shell to obtain sufficient strength and burn off the residual investment materials,; Metal materials required for pouring; Solidification cooling, sand cleaning after shelling, so as to obtain high-precision finished products. Heat treatment, cold processing and surface treatment shall be carried out according to the product requirements.
