7050-T7451铝合金干切削表面完整性研究  

Study on Surface Integrity of Dry Cutting of 7050-T7451 Aluminum Alloy

作　　者：岳修杰 张平[1] 宋爱利[1] 韩双凤[1] 李宝顺[2] YUE Xiujie;ZHANG Ping;SONG Aili;HAN Shuangfeng;LI Baoshun(College of Mechanical and Electrical Engineering,Qingdao Huanghai University,Qingdao 266520,China;School of Electromechanical and Automotive Engineering,Yantai University,Yantai 264000,China)

机构地区：[1]青岛黄海学院智能制造学院,山东青岛266520 [2]烟台大学机电汽车工程学院,山东烟台264000

出　　处：《有色金属工程》2021年第3期33-41,共9页Nonferrous Metals Engineering

基　　金：国家自然科学基金资助项目(51705270);山东省青创计划项目(2019KJB022)。

摘　　要：旨在探究干式切削条件下切削参数对7050-T7451铝合金表面完整性的影响规律,基于单因素面铣削实验,得到了切削参数对切削力、工件表面形貌、加工硬化和残余应力的影响规律。结果表明:切削三要素对切削力和工件表面粗糙度有着明显的影响,在切削速度较低时,X向切削力略微增大,而切削速度由500 m/min变化到1000 m/min时,X向切削力逐渐较小,随后呈增大的变化趋势,切削力与切削深度、进给量呈正相关关系。较高的切削速度和较小的进给量可以改善表面粗糙度,切削深度对表面粗糙度影响较小;加工硬化随切削速度与进给量的增大呈先增大后减小的变化趋势,而加工硬化程度与切削深度呈负相关关系;残余应力随切削参数的改变呈“勺”形分布,切削速度与进给量对残余应力的影响较大,且表层残余压应力的最大值基本在0.05~0.2 mm,而亚表层残余拉应力最大值在0.25~0.4 mm。In order to explore the influence of cutting parameters on the surface integrity of 7050-T7451 aluminum alloy under dry cutting conditions.The variation laws of the cutting parameters on cutting force,workpiece surface morphology,work hardening and residual stress are obtained based on single-factor face milling experiments.The results show that the three elements of cutting have a significant impact on the cutting force and the surface roughness of the workpiece.When the cutting speed is low,the X-direction cutting force increases slightly,and when the cutting speed is changed from 500 m/min to 1000 m/min,the X-direction cutting force is gradually smaller,and then shows an increasing trend.The cutting force has a positive correlation with the cutting depth and the feed rate.The roughness is improved at higher cutting speeds and smaller feeds,surface roughness is less affected by the cutting depth;With the increase of cutting speed and feed rate,work hardening shows a trend of first increasing and then decreasing,the degree of work hardening has a negative correlation with the cutting depth;When the cutting parameters changed,the residual stress curve was distributed in the shape of spoon.Residual stress is greatly affected by cutting speed and feed.The maximum value of surface residual compressive stress is basically between 0.05—0.2 mm,the maximum residual tensile stress of the sub-surface layer is in the range of 0.25-0.4 mm.

关 键 词：7050-T7451铝合金 切削力 表面形貌 加工硬化 残余应力 

分 类 号：TG146[一般工业技术—材料科学与工程]