"I am very excited to be joining Community Broadcasters in the great market of Florence," Mulling
The second foundry, which utilizes automatic matchplate molding with proper mulling
, upped its levels of Western Bentonite by about 20%.
Through the testing, Hydrobond was shown to improve mulling
times and efficiencies, resulting in higher green strength, lower moisture contents, higher green tensile strength, lower sand friability and lower dry strength.
Between 120-160F, mulling
produces sand that is inconsistent and difficult to control." The paper concluded that the best sand for molding was fully mulled, cool sand below 120F.
If the return sand system does not adequately cool and hydrate the hot, dry shakeout sand, then even the best mulling
will have a difficult time creating somewhat uniform clay hydration.
The AFS clay composite undergoes agglomeration with the MB clay during final mulling
. The agglomerates respond to molding and heating from the casting process.
If the doors are of the type that open when high amperage is reached, the door may open before sufficient mulling
This concern has increased further with higher core sand-to-molding ratios and the ever-shortening of available mulling
times in high-speed molding sands.
* Once clay balls exist in system sand, repeated recycling and mulling
increases the size of the clay ball.
Typical green sand system practice consists of molding, assembling and closing, pouring, cooling, shakeout, metal and refuse removal, cooling, storage, mulling
with water, adding bentonite and seacoal or cereal, and returning the sand mixture to molding.
Based on the success of NN-based control to arc furnaces, a project was initiated to investigate applications for green sand mulling
. The first phase of the project, designed to verify the modeling ability and the feasibility of this approach, is complete.
Critical to proper sand preparation, mulling
requires a careful understanding of the process' place in the entire sand system.