镁合金铸造用自硬树脂砂性能特征及其影响因素研究_刘富初

镁合金铸造用自硬树脂砂性能特征

及其影响因素研究

刘富初，虞强，樊自田，何家庆，刘鑫旺 ，谭飞 ，刘春霞

（1.华中科技大学 材料成形与模具技术国家重点实验室，湖北 武汉 430074;

2.中国南方航空工业有限公司，湖南 株洲 412000）

摘要：本文研究了树脂加入量和固化剂加入量对呋喃树脂砂抗拉强度、发气量和残留强度的影响，确定了满足生产需要的优化配方。测试了优化配方的可使用时间及不同原砂种类对呋喃树脂砂性能的影响。结果表明：优化配方为1.6%的树脂和50%的固化剂，优化配方的可使用时间为14min，使用宝珠砂可以较大降低树脂的加入量，提高型砂的强度，降低型砂的发气量和残留强度、提高型砂的溃散性。通过SEM的测试方法对不同原砂种类的树脂砂进行了分析。SEM分析表明，宝珠砂颗粒圆整，呈标准球形，能形成完整的粘结膜和粘结桥。

关键词：镁合金；自硬呋喃树脂；砂型铸造；抗拉强度；发气量；溃散性

1211122Research on Performance and its Influencing Factors of No-Bake Furan Resin Sand for Magnesium Alloy Casting

LIU Fu-chu1, FAN Zi-tian1, LIU Xin-wang1, HE Jia-qing1, YU Qiang2, TAN Fei2, LIU Chun-xia2 (1.State Key Laboratory of Material Processing and Die and Mould Technology,

Huazhong University of Science and Technology, Wuhan 430074, China;

2.China National South Aviation Industry, Zhuzhou 412000, China)

Abstract: The effects of furan resin and curing agent addition on no-bake furan resin tensile strength, gas evolution and retained strength has been studied, the optimum formulation which satisfied production need has been defined. The available time of the optimum formulation and effect of different kinds of fresh sand on performance of no-bake furan resin sand has been studied. The results showed that the optimum formulation was 1.6 percentages furan resin and 50 percentages curing agent, the available time of the optimum formulation was 14min, ceramacore could decrease furan resin addition greatly, increase tensile strength of no-bake furan resin sand, decrease gas evolution and retain strength of no-bake furan resin sand, which could improve collapsibility of no-bake furan resin sand. Scanning Electron Microscope (SEM) has been used to analyse no-bake furan resin sand which were prepared by different kinds of fresh sand. The SEM analysis demonstrated that the ceramacore particle was roundness, appeared standard sphere, and the ceramacore could form complete bonding film and binding bridge.

Key words: magnesium alloy; no-bake furan resin; sand casting; tensile strength; gas evolution; collapsibility

基金项目：国家自然科学基金资助项目(51375187)

作者简介：刘富初，男，博士研究生，E-mail: lfchust@163.com。

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