Knockout is a process in foundry operations in which a metal casting that has been cooled and solidified is released from the mold. It is a necessary step in the casting production process that separates the final part from the molding material.

Key Features:

• Process Mechanics: After the molten metal solidifies, the mold is physically broken or vibrated to remove a casting. This is done manually or with a mechanical knockout machine.
• Purpose: The knockout process allows a casting to be removed and freed from its mold without damage, while simultaneously ensuring excess sand or mold material can be removed at the same time.
• Subsequent Process Step: After the knockout process occurs, the casting is typically either cleaned, trimmed, or finished in order to create the final shape and surface quality required.

The knockout process is critical in a foundry, as it represents the pause between molding and finishing processes. A better knockout process saves time and reduces defects, which is imperative for a strong, durable, quality casting for industries such as transportation (automotive), machinery, or construction.