Investment casting, also known as lost-wax casting, is a precision casting technique that allows for the production of complex metal parts with excellent surface finishes. A crucial step in this process is metal pouring, where molten metal is carefully poured into the ceramic mold. Understanding the terminology associated with this stage is essential for anyone involved in the investment casting industry.
Molten Metal: This refers to the metal that has been heated to a liquid state, ready for pouring. Common molten metals used in investment casting include steel, aluminum, and various alloys.
Crucible: A heat-resistant container used to hold the molten metal during the pouring process.
Pouring Ladle: A tool used to transfer molten metal from the crucible to the ceramic mold.
Pouring Cup: The opening in the ceramic mold where the molten metal is poured.
Sprue: The channel through which the molten metal flows into the mold cavity.
Runner: Horizontal channels that distribute molten metal to multiple mold cavities.
Gate: The point where the molten metal enters the mold cavity.
Solidification: The process of the molten metal cooling and hardening within the mold.
Shrinkage: The contraction of the metal as it solidifies, which can affect the final dimensions of the casting.
Porosity: Voids or air pockets within the solidified casting, which can weaken the part.
Inclusion: Non-metallic particles trapped within the casting, which can also compromise its integrity.
Preheating: The process of heating the ceramic mold before pouring to prevent thermal shock and ensure proper metal flow.
Deoxidation: The process of removing oxygen from the molten metal to prevent the formation of oxides, which can lead to defects. Understanding these terms will help you communicate effectively with others in the industry.