用树脂自硬砂代替桐油砂后，由于其自硬成型，减少了砂芯在搬运、烘烤过程中的变形，保证了试制产品的尺寸精度。为解决用粘胶粘合后的两片砂芯容易开裂而导致浮芯废品的大量产生这一技术难题，在实践中探索出一种新的方法：在两片砂芯的预制孔里灌进配制好的树脂自硬砂，合芯后两片砂芯被牢牢地“铆”在一起，因而砂芯无开裂现象，铸件无浮芯废品产生。 Resin resin sand instead of tung oil sand, because of its self-forming, reducing the sand core during handling, baking deformation, to ensure the dimensional accuracy of trial products. In order to solve the technical problem of mass production of floating cores caused by easy cracking of two sand cores glued with viscose, a new method was put forward in practice: pouring into the prefabricated holes of two sand cores Prepared a good resin from hard sand, combined with the two core sand core is firmly “riveting” together, so there is no cracking of the sand core, the casting of non-core waste products.