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。
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