Permanent Molds: Casting Techniques

This lecture covers the use of permanent molds in casting techniques, focusing on gravity, low pressure, and high pressure molding. Permanent molds, typically made of metal, offer advantages such as improved mechanical properties and rapid cooling rates. Gravity molding involves preheating and coating the mold, while low pressure molding requires a hermetically sealed environment and vacuum or overpressure conditions. High pressure casting techniques, whether cold or hot chamber, utilize hydraulic cylinders and high pressures to inject molten metal into the mold. The lecture also discusses centrifugal casting, where the mold rotates to distribute the metal evenly. Different materials and processes are explored, highlighting the benefits and limitations of each technique.