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所谓熔模铸造工艺，简单说就是用易熔材料（例如蜡料或塑料）制成可熔性模型（简称熔模或模型），在其上涂覆若干层特制的耐火涂料，经过干燥和硬化形成一个整体型壳后，再用蒸汽或热水从型壳中熔掉模型，然后把型壳置于砂箱中，在其四周填充干砂造型，最后将铸型放入焙烧炉中经过高温焙烧（如采用高强度型壳时，可不必造型而将脱模后的型壳直接焙烧），铸型或型壳经焙烧后，于其中浇注熔融金属而得到铸件。
The so-called investment casting process is simply to use fusible materials (such as wax or plastics) to make fusible models (for short, fusible models or models), coated with a number of layers of special refractory coatings, after drying and hardening to form a whole shell, then use steam or hot water to melt the model from the shell, and then the shell. Placed in the sand box, filled with dry sand around it, and finally put the mould into the calciner to roast at high temperature (for example, when using high-strength shell, the shell after demoulding can be roasted directly instead of moulding). After roasting, the casting or shell can be obtained by pouring molten metal into it.
熔模铸件尺寸精度较高，一般可达CT4-6（砂型铸造为CT10~13，压铸为CT5~7）,当然由于熔模铸造的工艺过程复杂，影响铸件尺寸精度的因素较多，例如模料的收缩、熔模的变形、型壳在加热和冷却过程中的线量变化、合金的收缩率以及在凝固过程中铸件的变形等，所以普通熔模铸件的尺寸精度虽然较高，但其一致性仍需提高（采用中、高温蜡料的铸件尺寸一致性要提高很多）。
The dimension accuracy of investment casting is high, generally up to CT4-6 (sand casting is CT10-13, die casting is CT5-7). Of course, due to the complex process of investment casting, there are many factors affecting the dimension accuracy of investment casting, such as shrinkage of mould material, deformation of investment mould, linear change of shell during heating and cooling, shrinkage rate of alloy. As well as the deformation of castings during solidification process, the dimensional accuracy of ordinary investment casting is higher, but its consistency still needs to be improved (the size consistency of castings with medium and high temperature wax is much higher).