【摘要】 采用低熔点镓铟锡合金物理模拟方法对薄壁件行波磁场下合金熔体充型特点进行了研究,获得了合金熔体的充型规律及产生气孔、冷隔等铸造缺陷的主要原因。对合金熔体在充型过程中的受力状态进行分析,获得行波磁场上方均匀的电磁力与其他力综合后,使合金熔体充型过程中存在加速-匀速-减速的运动特征。结果表明,沿充型方向单调递减的电磁推力能够使充型过程中的合金熔体尽早进入匀速阶段,是解决气孔、冷隔等铸造缺陷的关键。更多还原

【Abstract】 Alloy melt filling characteristics under the travelling wave magnetic field of thin-walled parts were studied by using the low melting point gallium-indium-tin alloy physical simulation method, thus the alloy melt filling rule and the main reason for the casting defects such as gas hole, cold shut were obtained. Stress states in the filling process of alloy melt were analyzed. After the uniform electromagnetic force above traveling wave magnetic field and other force applied to alloy melt, the movement characteristics of alloy melt is acceleration-uniform-slow down during filling mold. The result shows that monotone decreasing electromagnetic thrust along filling direction is to make the alloy melt filling into the uniform phase as soon as possible, which is the key to solve the casting defects such as gas hole, cold shut.更多还原