目前，国内大多数叶轮铸造厂家的叶轮芯砂粘结剂采用桐油或合脂油，其优点是具有一定的湿强度，容易取出叶片，浇注后出砂性好，与自硬粘结剂相比价格较低，但其缺点是需要烘烤才具有干强度，且在烘烤过程中容易发生随机蠕变，这样很难保证叶片的设计形状，这是国内水泵性能不 At present, most impeller foundry manufacturers in China use tung oil sand or sand binder, which has the advantages of having certain wet strength, easy to remove the blade, good sand output after pouring, and the price of self-hardening binder But its disadvantage is that it needs to be roasted to have dry strength, and prone to random creep during baking, so it is difficult to ensure the design shape of the blade, which is the performance of the domestic pump