使用PLC控制的剪切变形功测试仪,记录型砂试样剪切变形过程的变形与强度变化,处理其结果得到剪切功,以表征型砂的韧性.研究了型砂紧实率、膨润土含量、制样锤击次数和淀粉加入量对试样剪切功的影响,并探讨剪切变形中不同阶段剪切功的意义.%A shear strength energy tester controlled by PLC was used to record the deformation and the shear strength of moulding sand samples, and the results obtained are then processed to calculate the shear energy, which is used for characterizing the toughness of moulding sand. Different compactability, bentonite content, starch content and number of rams are applied to explore their influences on shear energy of the sand. Shear energy of different phases in the shear process was also studied.
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