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There are two major categories of dewaxing casting method: solid modeling method and pottery shell model, the latter is the improvement method of the former.
After considering the condensation and contraction of the wax type, the heating and expansion of the molding mold, and the condensation and contraction of the melting metal, the production of the mold with the final casting size is similar. Inject the melted wax pledge into the mold made of metal or silicone. After removing the wax type, the slurry of the microfiny refractory material and the binder is mixed with the bonding agent.
After dripping, sprinkle thick refractory materials to dry it. Put it in the casting frame, fill the refractory particles with adhesives, and then dry it. Then heated the wax to melt out and make the mold. Heat the mold with high temperature, burn a small amount of residual wax quality and increase its strength, and then inject metal fuse into.
The pottery shell method is the same until the production of the wax type is the same as the solid mold method. It is not carried out after a stained slurry and pour sand (or floating sand). , Until the thickness of the predetermined shell is obtained. Drying, heating, melting out of waxing, high temperature heating and then pouring. This method is widely adopted by the current anti -wax precision casting operator, because it has the following advantages:
(1) Better stability;
(2) The amount of refractory materials is less useful;
(3) Light weight, easy to carry, process, and make large casts;
(4) Process can be localized to save manpower and increase production rates; (5) Low production costs;
(6) The pottery shell mold is thinner, and the cooling rate of the casting after the casting is high and uniform, so its mechanical nature is better.