face roughness Ra 0.4um specificationtheof hydraulic Р cylinder castings,we berried chiller in the sand during molding process to increase the temperature gradient, Р highthe tensile strength pactness;using multistep runing system,it goodis to uniformthe distrubution Р oftemperature and avoid localoverheating;meanwhile using conner feederwhich goodis to controlthe salg and Р strongerremoving for shrinakgeproblem.For themelting process,using and steel recarburizer chargeas material, Р Labased FSM and Ba based inoculant,control pouring the temperature properly;through these,it cancontrol the Р shrinkage,porosity,gashole,slag inclusion and on,producingSO high quality hydraulic cylinder castings. Р Keywords:ducitleiron;shrinkage;chiller;roughness;FSM(nodulizer) Р 32 32 o FM T 中国铸造装备与技术 1/201 6
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