压铸压室内部界面传热反算模型的建立和应用

发布时间：2018-06-06 10:30

本文选题：压铸 + 压室　；参考：《金属学报》2015年06期

【摘要】：基于热传导反算法,建立了液态金属与压室之间传热的二维反算数学模型,设计了压室内部测温模块并进行了针对Al-9%Si-3%Cu合金的静态无压射和常规压铸实验.基于实验中测得的压室内部不同位置的温度,求解得到了液态金属在压室中的温度场及其不同位置的界面换热系数,为预测压室预结晶提供可靠依据.结果表明,静态无压射条件与常规压铸条件下液态金属与压室界面换热情况差异很大,同时压室中间界面换热系数均随液态金属流动方向依次降低,压室壁温度也存在两端高中间低的分布.在常规压铸条件下,由于冲头运动的影响,压室末端换热系数存在双峰现象.
[Abstract]:Based on the inverse heat conduction algorithm, a two-dimensional inverse mathematical model of heat transfer between liquid metal and pressure chamber is established. The temperature measurement module in the chamber is designed and the static pressureless and conventional die casting experiments for Al-9%Si-3%Cu alloy are carried out. The temperature field of liquid metal in the chamber and the interfacial heat transfer coefficient at different positions are obtained based on the temperature at different positions of the chamber measured in the experiment, which provides a reliable basis for predicting the precrystallization of the chamber. The results show that the heat transfer between liquid metal and chamber is very different between static pressure free ejection condition and conventional die casting condition, and the heat transfer coefficient of the middle interface of pressure chamber decreases in turn with the flow direction of liquid metal. The pressure chamber wall temperature also has the distribution of both ends high and middle low. Under conventional die-casting conditions, the heat transfer coefficient at the end of the chamber has a bimodal phenomenon due to the impact of punch movement.
【作者单位】：清华大学材料学院;
【基金】：国家自然科学基金项目51275269和51205229 国家科技重大专项项目2012ZX04012011资助~~
【分类号】：TG249.2

【参考文献】