7075铝合金切削加工晶粒尺寸演化过程研究  

Study on Grain Size Evolution Mechanism of 7075 Aluminum Alloy during Machining

作　　者：郑广花[1] 刘孟阳 张嘉慧 黄留洋 付宏鸽[1] Zheng Guanghua;Liu Mengyang;Zhang Jiahui;Huang Liuyang;Fu Hongge(North China Institute of Aerospace Engineering,Langfang 065000,China)

机构地区：[1]北华航天工业学院,河北廊坊065000

出　　处：《廊坊师范学院学报（自然科学版）》2024年第2期57-61,共5页Journal of Langfang Normal University(Natural Science Edition)

基　　金：北华航天工业学院重点项目(ZD202302);北华航天工业学院创新资助项目(YKY-2022-03);河北省研究生建设项目(KCJSX2024110)。

摘　　要：金属材料在切削加工过程中,表层晶粒在机械载荷和热载荷的剧烈冲击作用下快速再结晶使表面形成晶粒细化层,该细化层严重影响材料使役性能。在研究切削加工晶粒尺寸演化机制的基础上,通过DEFORM仿真软件实现7075铝合金晶粒尺寸演化过程,开展单因素法试验,构建了晶粒尺寸关于切削速度、进给量的预测模型。结果表明:切削速度增加,表层晶粒尺寸增大,细化层厚度减小;进给量增加,晶粒尺寸和细化层厚度在温度和塑性变形共同作用下先增加后减小。通过实验验证,该模型能够较为准确地预测材料表面晶粒尺寸。During the cutting process of metal materials,the surface grains rapidly recrystallize under the severe impact of mechanical and thermal loads,forming a grain refinement layer on the surface,which seriously affects the material's service performance.On the basis of studying the evolution mechanismof grain size in cutting machining,this article uses DEFORM simulation software to achieve the evolution process of grain size in 7075 aluminumalloy,conducts single factor method ex-periments,and constructs a prediction model of grain size regarding cutting speed and feed rate.The results show that as the cutting speed increases,the surface grain size increases,and the thickness of the refined layer decreases;as the feed rate in-creases,the grain size and refined layer thickness first increase and then decrease under the combined effect of temperature and plastic deformation;experimental verification shows that the model accurately predicts the surface grain size of materials.

关 键 词：7075铝合金 晶粒尺寸 细化层 DEFORM 

分 类 号：TP319[自动化与计算机技术—计算机软件与理论]