The surface quality of Y2 frame and the percentage of end product can not be compatible, because the toughness and mobility of the moulding sand in clay sand are antagonistic each other.
型砂韧性和流动性在粘土砂中是互相对立的，它使Y2机座表面质量和成品率不能兼顾。
When occurring a certain amount of clay slurry, it leads to the changes of moulding sand in properties.
在出现一定量粘土浆前后，型砂的性能变化最大。
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