铝合金液态模锻流变充型能力预报模型  

Prediction Model of Rheological Filling Ability for Aluminum Alloy in Molten Metal Die Forging

作　　者：王营 邢书明[2] WANG Ying;XING Shuming(School of Mechatronics and Vehicle Engineering,Zhengzhou University of Technology,Zhengzhou 450044,China;School of Mechanical,Electronic and Control Engineering,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]郑州工程技术学院机电与车辆工程学院,河南郑州450044 [2]北京交通大学机械与电子控制工程学院,北京100044

出　　处：《常州大学学报（自然科学版）》2021年第5期15-24,共10页Journal of Changzhou University：Natural Science Edition

摘　　要：基于一维流动换热原理,通过谐波法求解一维耦合热传导——热对流方程,得到温度的沿程衰减规律,进而求出流变阻力的沿程增大规律;同时求解压力的沿程衰减规律,结合合金熔体停止流变机理和条件,建立铝合金液态模锻流变充型能力预报模型。该模型包含液态模锻工艺参数、材料性能参数及模具结构参数,适用于液相线温度以下的广义半固态合金熔体。采用6066铝合金通过间接液态模锻的阿基米德螺旋线试样长度验证模型的有效性,结果表明:理论结果与实验结果的最大相对偏差为8.2%。与现有的充型能力模型相比,本文的流变充型距离模型在预报精度及适用范围方面有一定的进步性。Based on the principle of one dimensional flow and heat transfer,the law of temperature attenuation along the path was acquired by solving the one-dimensional coupled heat conduction and convection equation with harmonic method.Then the law of rheological resistance increasing along the path was obtained.Meanwhile,the law of pressure attenuation along the path was solved.Finally,the prediction model of rheological filling ability for aluminum alloy in molten metal die forging was established by combining the stopping rheological mechanism and conditions of alloy melt.Furthermore,the model covered the process parameters of molten metal die forging,material property parameters and mold structure parameters,and it was suitable for generalized semi-solid alloy melt below liquidus temperature.The validity of theoretical model was verified by the length of Archimedes spiral sample of 6066 aluminum alloy by molten metal die forging.The results showed that the maximum relative deviation between the calculated results and the experimental results was only 8.2%.Compared with the existing filling ability model,the rheological filling distance model in this paper has some progress in the prediction accuracy and application scope.

关 键 词：液态模锻 充型能力 停止流变机理 数学模型 

分 类 号：TG3[金属学及工艺—金属压力加工]