To help you understand the classification and advantages and disadvantages of wax mold precision casting

Precision casting method refers to the general term for casting methods that use non-metallic molds and produce products with higher dimensional accuracy than ordinary sand mold castings, including dewaxing method, gypsum mold method, and ceramic mold method. Below is a brief introduction to the dewaxing precision casting method by precision casting mold manufacturers.

1、 Classification of wax mold casting:

dewaxing

There are two main types of precision casting methods: solid mold method and ceramic shell mold method, the latter being an improved method of the former.

After considering the condensation shrinkage of the wax mold, the heating expansion of the mold, and the condensation shrinkage of the molten metal, the solid mold method produces a mold that is similar in size to the resulting casting.

2、 Wax mold casting process flow:

(1) Solid mold method

Inject the melted wax into this mold made of metal or silicone, remove the wax shape, and immerse it in a slurry made by mixing micro powder refractory material and adhesive.

After dripping, spread coarse refractory material and let it dry.

Place it in the casting frame, fill it with refractory particles mixed with adhesive, and then dry it.

Then heat the wax to melt and flow out, making a mold.

Heat the mold at high temperature, burn off a small amount of residual wax and improve its strength, then inject molten metal.

(2) Ceramic shell molding method

The ceramic shell mold method until the wax mold production is the same as the solid mold method, except that after a single dip and sand pouring (or floating sand), the mold wrapping operation is not carried out, but repeated dip and sand pouring until the predetermined shell thickness is achieved.

Drying, heating, melting out wax, heating at high temperature before pouring, this method is widely adopted by the current dewaxing precision casting industry.

3、 Advantages of precision casting with ceramic shell mold method:

(1) Good dimensional stability;

(2) Less use of refractory materials;

(3) Lightweight, easy to handle, handle, and produce large castings;

(4) The process can be partially automated to save manpower and improve production speed;

(5) Low production costs;

(6) The ceramic shell mold is relatively thin, and the cooling rate of the casting after pouring is high and uniform, so its mechanical properties are better.