The sand mixture is tamped down as it is added, and the final mold assembly is sometimes vibrated to compact the sand and fill any unwanted voids in the mold.

• 为使制成的砂型和型芯具有一定的强度，在搬运、合型及浇注液态金属时不致变形或损坏，一般要在铸造中加入型砂粘结剂，将松散的砂粒粘结起来成为型砂。