目前铸造行业很多工厂使用水玻璃自硬砂、双快水泥自硬砂、呋喃树脂砂作为造芯用砂。这几种砂湿强度都很低,未硬化之前可塑性很差,采用刮板造芯时,砂子往高堆站不住,尤其是垂直方向自硬砂堆高后,就自然下塌,要用刮板刮制较高大的坭芯就非常困难, At present, many factories in the foundry industry use water glass self-hardening sand, double-fast cement self-hardening sand and furan resin sand as core making sand. These types of sand wet strength are very low, poor plasticity before hardening, the use of scraper core, the sand can not stand to high heap, especially in the vertical direction since the high sand, it will naturally collapse to use Scraping scraping the taller core is very difficult,