Low pressure casting

from Wikipedia, the free encyclopedia
Scheme of low pressure casting

Low pressure casting is an industrial casting process for the production of castings.

Metal casting

Low-pressure casting processes (LP casting processes) are casting arrangements in which the molten metal (primarily aluminum, but also magnesium, copper, iron and steel ) usually enters the mold cavity of the attached casting mold from below using a riser pipe, usually a permanent mold (permanent mold ), but also a sand mold or an investment casting mold (shell mold) is pressed. The upward movement of the liquid metal against gravity is preferably effected according to the gas pressure principle.

Basic procedure

When the gas is pressurized, the metal ascends into the mold cavity. After the mold has been filled, the gas pressure is maintained even during the solidification process, in order to enable replenishment to compensate for the volume deficit (voids) during the transition from the liquid to the solid state. Naturally, this presupposes a solidification that is as directed as possible from top to bottom and requires the most favorable casting design or cross-sectional gradations.

Plastic casting

The term low-pressure casting is also used in connection with overmoulding with hot melt adhesive . Here, a hot, liquid plastic compound is pressed into a tool at low pressure (1 to 30 bar).

Web links