在铸造生产中由于型砂在高温时的性能不良,常易产生包砂、鼠民等表面缺陷,甚至使铸件报废,给国家带来巨大损失。到目前为止,为了防止这些表面缺陷,在生产中仍然采取工艺方面的措施,如插钉子等。因为这些方法并不是从提高型砂高温性能上着手,所以常得不到理想的效果。同时又使造型工艺复杂化,增加了成本,降低了劳动生产率。 Due to the poor performance of the molding sand at high temperature in the casting production, surface defects such as sand packs and muringers often occur, and the castings are even scrapped, which brings about huge losses to the country. So far, in order to prevent these surface defects, in the production process is still taking measures, such as inserting nails and so on. Because these methods are not to improve the performance of high temperature sand start, it often can not get the desired effect. At the same time, it complicates the modeling process, increases the cost and reduces the labor productivity.