An interlayer pre-cooling apparatus for a sand mold freezing printing includes a sand paving apparatus. The sand paving apparatus is located above a negative-pressure low-temperature forming chamber, and the sand paving apparatus includes several independent sand paving grooves, a hollow sand paving roller, a cooling chamber, a sand scraping plate, and an openable and closable baffle. The openable and closable baffle is rotationally arranged at a discharge port of each sand paving apparatus, and the openable and closable baffle is used for paving low temperature premixed sand on demand. The premixed molding sand is further cooled during the process of scraping and compacting low-temperature molding sand. When the apparatus is adopted for sand mold freezing 3D printing, the low temperature of the premixed molding sand is precisely controllable, which has great significance for realizing interlayer pre-cooling of the sand mold freezing printing.

An interlayer pre-cooling apparatus for a sand mold freezing printing includes a sand paving apparatus. The sand paving apparatus is located above a negative-pressure low-temperature forming chamber, and the sand paving apparatus includes several independent sand paving grooves, a hollow sand paving roller, a cooling chamber, a sand scraping plate, and an openable and closable baffle. The openable and closable baffle is rotationally arranged at a discharge port of each sand paving apparatus, and the openable and closable baffle is used for paving low temperature premixed sand on demand. The premixed molding sand is further cooled during the process of scraping and compacting low-temperature molding sand. When the apparatus is adopted for sand mold freezing 3D printing, the low temperature of the premixed molding sand is precisely controllable, which has great significance for realizing interlayer pre-cooling of the sand mold freezing printing.

An air set molding apparatus configured to form a sand mold, the apparatus includes a pattern mounting plate including an ejection pin aperture, a molding flask on the pattern mounting plate, the molding flask having a closed lower end and an open upper end. The molding flask including an ejection pin aperture in the closed lower end, an ejection pin movable relative to the pattern mounting plate and the molding flask, the ejection pin movable through the ejection pin aperture of the pattern mounting plate and the ejection pin aperture of the molding flask between a lowered position and a raised position. As the ejection pin moves from the lowered position to the raised position, the ejection pin lifts the sand mold through the open upper end of the molding flask.

An air set molding apparatus configured to form a sand mold, the apparatus includes a pattern mounting plate including an ejection pin aperture, a molding flask on the pattern mounting plate, the molding flask having a closed lower end and an open upper end. The molding flask including an ejection pin aperture in the closed lower end, an ejection pin movable relative to the pattern mounting plate and the molding flask, the ejection pin movable through the ejection pin aperture of the pattern mounting plate and the ejection pin aperture of the molding flask between a lowered position and a raised position. As the ejection pin moves from the lowered position to the raised position, the ejection pin lifts the sand mold through the open upper end of the molding flask.