不同铣削参数对镁合金(AZ31B)表面质量的影响规律研究  

Effect of Different Milling Parameters on Surface Quality of Magnesium Alloy(AZ31B)

作　　者：马浩骞 常星星 陈卫林 吴杰 MA Haoqian;CHANG Xingxing;CHEN Weilin;WU Jie(Anhui Tianhang Electromechanical Co.,Ltd.,Wuhu 241000,China)

机构地区：[1]安徽天航机电有限公司,安徽芜湖241000

出　　处：《机械工程师》2023年第9期154-156,共3页Mechanical Engineer

摘　　要：进行了端面铣削加工对镁合金AZ21B表面特征的性能实验。在干式加工环境下,以刀具前角、线速度、最大切削厚度、切削深度为影响因子,以表面粗糙度作为分析表面完整性的指标,采用硬质合金刀具进行实验,实验结果表明:镁合金铣削加工中,随着切削深度、线速度、最大切削厚度的增加,工件的表面粗糙度也随之增加,其中切削深度小于6 mm、线速度小于1800 mm/s、最大切削厚度小于0.07 mm时,表面粗糙度值均为Ra1.0μm以下,可实现镁合金的高精度加工;同时刀具前角对镁合金加工至关重要,表面粗糙度随着刀具前角的增加呈现先增加、后降低的规律;当刀具前角在8°~16°区间内,表面粗糙度逐渐增加;当刀具前角为20°时,工件的表面质量相对较高,表面粗糙度为Ra0.5μm左右;结合整体试验的加工情况,特殊情况下刀具前角可以优先选择负角度加工。In this paper,the surface characteristics of AZ31B magnesium alloy are tested and studied by end milling.In the dry machining environment,the tool rake angle,linear velocity,maximum cutting thickness and cutting depth are taken as the influence factors,and the experiments are carried out with cemented carbide tools.The index of surface integrity is the surface roughness value.The experiments show that with the increase of cutting depth,linear velocity and maximum cutting thickness,the surface roughness of the workpiece also increases.When the cutting depth is less than 6 mm,the linear speed is less than 1800 mm/s,and the maximum cutting thickness is less than 0.07 mm,the roughness value is Ra1.0μm or less,high-precision machining of magnesium alloy can be achieved.Meanwhile,the rake angle of the tool is very important to the machining of magnesium alloy.The roughness increases first and then decreases with the increase of the rake angle of the tool.When the rake angle of the tool is between 8°and 16°,the roughness gradually increases.When the rake angle of the tool is 20°,the surface quality of the workpiece is relatively high,which is Ra0.5μm.In combination with the processing conditions of the overall test,the tool rake angle can be preferred to negative angles under special circumstances.

关 键 词：镁合金AZ31B 表面粗糙度 高精度 前角 

分 类 号：TG54[金属学及工艺—金属切削加工及机床]