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1·Green sand casting casting clay weight from a few kilograms until decades kilograms, machine tool lathe bed and clay dry type of casting production can be weighed dozens of tons.

粘土湿型砂铸造的铸件重量可从几公斤直到几十公斤，机床床身而粘土干型生产的铸件可重达几十吨。

2·The requests for dry-sand, vibrating table, structure of negative pressure sanrl box and proceedings to be noticed in casting pro-cesss have been put forward definitely.

结合工厂多年的生产经验，对于砂性能、振实台和负压砂箱的结构以及负压浇注过程中的注意事项提出了明确的要求。