MAS 2.0 - Guides - F.A.Q. - Tutorials - Home

Variations

Low-Pressure Permanent-Mold Casting

Low-pressure permanent-mold casting forces the molten metal through a vertical tube by applying low pressure of 5-15 psi to a molten bath below.

Clean metal from the center of the melt is drawn into the mold, never passing through the atmosphere. Thus, the low-pressure process is particularly attractive for rapidly oxidizing metals, such as aluminum. By controlling the pressure, the mold can be filled from the bottom in a controlled, nonturbulent manner. This minimizes gas porosity and dross. Mold cooling is designed such that directional solidification occurs from top down.

Vacuum Permanent-Mold Casting

A vacuum is used to draw material into the permanent mold. All the benefits and features of low-pressure process apply here. Because vacuum is used, the cleanliness of the metal and the dissolved gas content are superior even to those of the low-pressure process.