All mold makers have challenges in common. Individual processes may vary but all prepare for the pour.
A good pour is determined by pouring temperature, pouring rate and turbulence.
A proper gating system provides a channel through which molten metal can flow into the empty cavity.
A venting system allows air to escape.
Sharp corners and interior angles are difficult to shape so the flow of metal must be planned wisely.
There will be shrinkage during cooling as metal in a solid phase has a higher density than in liquid phase.
A good pour is determined by pouring temperature, pouring rate and turbulence.
A proper gating system provides a channel through which molten metal can flow into the empty cavity.
A venting system allows air to escape.
Sharp corners and interior angles are difficult to shape so the flow of metal must be planned wisely.
There will be shrinkage during cooling as metal in a solid phase has a higher density than in liquid phase.
Castings should not be moved before solidification. If in doubt, there is an interesting formula for calculating solidification time called Chvorinov's Rule. It is a mathematical relationship that relates the solidification time for a simple casting to the volume and surface area of the casting. In simple terms the rule establishes that under otherwise identical conditions, the casting with large surface area and small volume will cool more rapidly than a casting with small surface area and a large volume. (Wikipedia)
It is fascinating to learn about some of the different ways casting is being used. It seems there are endless possibilities that can range from molding body parts such as baby's feet to molding printed images that have been cut from Styrofoam. I wouldn't make a gun model to cast but I do appreciate the technique shown below.
The future for metal casting and mold making looks bright.
It is fascinating to learn about some of the different ways casting is being used. It seems there are endless possibilities that can range from molding body parts such as baby's feet to molding printed images that have been cut from Styrofoam. I wouldn't make a gun model to cast but I do appreciate the technique shown below.
The future for metal casting and mold making looks bright.