合金熔体挤压铸造充型能力的研究.pdfVIP

合金熔体挤压铸造充型能力的研究 1 1 2 3 1 张海英 邢书明 张庆华 谭建波 刘文 1. 北京交通大学半固态成型研究中心，北京，100044 2. 石家庄机务段 3. 河北科技大学材料与工程学院 摘要 提出了利用间接反挤阿基米德螺旋线长度来评价挤压铸造条件下合金熔体充型能力 的实验评定方法。正交析因实验和理论计算模型都证明，充型压力和充型速度是影响合金熔 体充型能力的两个主要因素，提高充型压力或适当减小充型速度都可以提高充型能力，浇注 温度对充型能力的影响不显著。根据充型压力不小于熔体流动时的摩擦阻力与熔体流动时的 局部阻力之和的充填条件，运用不可压缩粘性流体流动理论，针对评价实验方法，建立了定 量计算挤压铸造条件下合金熔体最大充填长度的数学公式，其计算值与实验测定值之间的最 大偏差小于 15%，可以用来定量分析和估算各种因素对充型能力的影响作用，预测最大充 型长度，对挤压铸造工艺设计和模具设计都有参考价值。 关键词 挤压铸造 工艺参数 充型能力 理论计算 实验评定 中图分类号：TG249.9 Study on the Mould-filling Ability of Alloy Fluid in Squeeze Casting 1 1 2 3 1 Haiying Zhang Shuming Xing Qinghua Zhang Jianbo Tan Wen Liu 1 Semisolid forming research center,Beijing Jiaotong University,Beijing100044 2 Shijiazhuang Locomotive Depot 3 Department of material and engineering,Hebei University of Science and Technology Abstract: The experimental assess method of alloy fluid is put forward used the length of Archimedes spiral line through indirect squeezing in squeeze casting. It is found that mold-filling pressure and mold-filling velocity both have prominent effect on the mold-filling ability of alloy fluid proved in orthogonal experiments and theory calculating. The larger the mold-filling pressure or the proper lower mold-filling velocity is, the better the mold-filling ability is. It is also found that the pouring temperature has a little effect on the mold-filling ability. Based on the filling conditions that mold-filling pressure is not less than the summation of the friction resistance and the part resistance generated from the f