负压造型时芯砂充填密度分布及其影响因素  

Density Distribution of Sand Packing in Vacuum Suction Molding Process and its Influential Factors

作　　者：向群英[1] 大中逸雄[2] 

机构地区：[1]重庆大学机械工程学院,重庆400044 [2]大阪大学大学院材料开发工学科,日本大阪1210813

出　　处：《重庆大学学报（自然科学版）》1999年第5期1-5,共5页Journal of Chongqing University

摘　　要：通过直接观察圆筒内芯砂的充填过程，测定空气压和粉体压的变化以及砂芯的充填密度分布，考察了芯砂的充填机理，指出砂芯的密度分布一定程度上可用砂粒接触时产生的粉体压理论说明。阐述了影响圆筒内砂芯密度分布的主要因素有高速运动砂粒急速停止时的冲击、流过多孔质砂层的气流阻抗以及壁面前断摩擦。By means are measured of the direct observation of the packing behavior of sand in the vacuum suction molding process.The air and powder pressure,density distribution of sand core.The packing mechanisms are studied based on these experimental results.It found that the density distribution of sand core is elucidated by powder pressure theory,and the density distribution is decided by air flowing,sand chocking and shearing.

关 键 词：负压造型 芯砂充填 密度分布 粉体压 铸造 

分 类 号：TG242.7[金属学及工艺—铸造]