Investment casting is the modern embodiment of the very ancient lost wax casting.
The process starts by making a wax model of the desired component. Here the wax part is injection molded.
![](http://toolnotes.com/wp-content/uploads/2021/02/Investment1.png)
![](http://toolnotes.com/wp-content/uploads/2021/02/Investment2.png)
Wax patterns are assembled onto a common wax sprue
![](http://toolnotes.com/wp-content/uploads/2021/02/Investment3.png)
The assembled tree is then coated with a refractory slurry.
![](http://toolnotes.com/wp-content/uploads/2021/02/Investment4.png)
The slurry is then covered with a dry refractory powder. This is repeated many times.
![](http://toolnotes.com/wp-content/uploads/2021/02/Investment5.png)
An investment of refractory material is built up.
![](http://toolnotes.com/wp-content/uploads/2021/02/Investment6.png)
The wax is melted out, and the ceramic investment is fired to form a strong mold.
![](http://toolnotes.com/wp-content/uploads/2021/02/Investment7.png)
The mold is then heated further and poured.
![](http://toolnotes.com/wp-content/uploads/2021/02/Investment8.png)
The investment is then removed mechanically.
![](http://toolnotes.com/wp-content/uploads/2021/02/Investment9.png)
The individual parts are then separated and finished.
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