Step 1: The model
- Realization in stereolithography on printer wax or resin.
- Manual realization in sculpting wax or directly in metal for simple models.
Step 2: TThe silicone impression mold
The rubber mold, made by vulcanization under pressure and at high temperatures, using a model of metal.
Step 3: Wax
Wax heated to about 70 ° C. is injected into the mold.
Step 4: Mounting
“Tree” in wax. The prints are mounted on a stem, like branches on a tree trunk.
Step 5: Coating
The shaft is enclosed in a perforated cylinder, previously sealed with a plastic film, in order to be able to contain the coating (refractory plaster).
Step 6: Casting
The mold is placed in a vacuum chamber. The metal fills the impression.
Step 7: The metal shaft
After the casting, when the cylinder is still warm, waits for a minute and then it is soaked in a bucket of cold water. The coating disintegrates and allows the metal shaft to be easily removed. The shaft is then cleaned with a high-pressure water jet and then with a wet sandblaster.
Step 8: The deburring
Deburring is the step of removing the casting rods from the cast iron shafts.