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Precision Investment Casting Mold Production

Yutung Industrial Limited | Updated: Nov 03, 2017

Dewaxing precision castings are widely used in jet engines, gas turbines, steam turbines, aircraft parts, internal combustion engines, vehicles, food machinery, printing machinery, paper making machines, compressors, valves, pumps, gauges, sewing machines, weapons, business machines, and other machine parts.Precision Investment Casting

After considering the condensation shrinkage of wax, the heating expansion of the mould and the condensation shrinkage of the molten metal, the solid Die method is made to approximate the final casting size. Pour the melted wax pledge into the mould made of metal or silica gel, remove the wax type, and immerse in the slurry of the powder refractory and binder. After dropping, sprinkle the coarse-grained refractory to make it dry.Precision Investment Casting 

Put in a cast frame, fill the refractory particles with a binder, then dry. The wax is then melted out and made into a mold. The mold is heated at high temperature, and the residual wax is burned and the strength is increased, then the molten metal is injected.Precision Investment Casting

Ceramic shell mold until the production of wax is the same as the solid mold method, only after a dip in the slurry and drench sand (or floating sand), do not carry out the package, but repeatedly to dip and drench sand, until the thickness of the shell to obtain the predetermined. Drying, heating, melting out of wax, high-temperature heating and then pouring, this method for the current dewaxing precision casting industry are widely used.Precision Investment Casting

The shape of the main model is similar to that of the final product, and the condensation of the wax must be contracted, and the heating expansion of the mould and the condensation shrinkage of the casting metal are considered. For example, the wax shrinkage rate is 1.2%, the mold's thermal expansion rate is 0.7%, casting metal shrinkage rate is 1.7%, then the main model of the size increase is 2.2%, commonly used materials such as aluminum alloy, copper alloy and stainless steel.Precision Investment Casting