Investment Casting Tutorial: Making Molds for Lost Wax Casting

When we are doing lost wax casting, we need to make a mold to contain the melted metal. This mold needs to be very precise to ensure that the final product meets the requirements. One common method for making molds is investment casting.
The investment casting process can be compared to making a candle. First, we need to make a mold for the candle, usually coated with silicone or other special coatings. This coating will form a hard shell during firing to carry the molten metal.
Then, we need to fill the mold with wax, just like pouring wax into a candle mold. This wax filling is equivalent to the prototype of the product we want to cast.
Next, we need to put the wax mold into an oven for firing. The purpose of firing is to burn off the wax from the investment material, leaving behind a hollow mold. This is like burning off the wax in a candle mold, leaving behind a hollow candle.
When the mold is fired, we need to put it into a casting machine and pour it with molten metal. The molten metal will fill the voids in the mold and form the final product. This is like pouring melted wax into a candle mold to form a candle.
Finally, we need to break the hard shell, take out the cast product, and do further processing and finishing. This is like breaking the hard shell in a candle mold and taking out the final candle.
For example, if you want to cast a silver ring, you can first make a wax mold of the ring, then coat it with investment material and let it harden, fill the mold with wax, and finally bake the investment material to form a hollow mold. Next, you can put the mold into a casting machine and pour it with molten silver to form the final silver ring.
I hope this example can help you better understand the investment casting process.
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[@BossSpringsteen69]

looks like the assembly for the door rollers on a plug door boxcar.

[@user-zx8ow4wy9z]

mtjt0520

[@user-zx8ow4wy9z]

V：mtjt0520

[@nevinkuser9892]

What is lost wax casting?

[@Rowow]

they create a item out of wax. Dip it in a slurry that forms a mold. Then melt out the wax and pour in molten metal