After the bulk of the wax is forced from the core, the shell remains in the dewax
furnace for some time to allow any residual wax to burn off.
The metalcastzer uses three push-through flash fire ovens to dewax its molds.
The testing found three major components of the process that have a significant influence on dewax performance: mold heating rate, shell permeability and base wax formulation.
The dewax operator must constantly monitor and adjust the loading rate of the baskets to ensure complete burnout of the wax.
Although this method might take up to 24 hours longer than the other, it's used when the mold's strength is not high enough to survive through dewax without some damage.
If necessary, open a portion of the mold after dewax or firing to examine it better.
The steam injection into the autoclave might blow loose materials into the mold during the process, so it is essential that the autoclave and dewax carts are clean.
and Burnout--Just as in commercial investment casting applications, a steam autoclave is used because it enables wax to be quickly eliminated from the shell.
This correlated to a better chance of going through dewax
without cracking, which can be supported by the stress-strain data to determine toughness.
From the dip cells, the completed and dried molds go automatically to the dewax
cell, where they enter the autoclave, which was designed by Signicast.
In dewaxing and firing techniques, care must be taken when developing a process or technique to dewax
, prefire and fire a shell for pouring.