刀具磨损对GH4169加工表面完整性的影响  

Influence of tool wear on machining surface integrity of GH4169

作　　者：谢晓莹 朱浩阳 张银霞[2] XIE Xiaoying;ZHU Haoyang;ZHANG Yinxia(School of Electrical and Information Engineering,Zhengzhou University,Zhengzhou 450001,Henan,China;School of Mechanical and Power Engineering,Zhengzhou University,Zhengzhou 450001,Henan,China)

机构地区：[1]郑州大学电气与信息工程学院,河南郑州450001 [2]郑州大学机械与动力工程学院,河南郑州450001

出　　处：《钢铁》2023年第8期195-201,共7页Iron and Steel

基　　金：国家自然科学基金资助项目(U1804254)。

摘　　要：表面完整性是评价机械零部件加工质量的重要参数,并且表面完整性对机械零部件的使役性能(包括耐腐蚀性能、耐磨损性能以及疲劳性能等)存在直接影响。针对高速切削高温合金(耐热合金钢)时表面完整性不佳难题,开展高温合金GH4169高速切削试验,研究刀具磨损对高速切削高温合金GH4169表面完整性(包括表面粗糙度、显微硬度、残余应力和微观结构等)的影响规律,改善高温合金加工表面完整性,进而为高温合金的高质加工提供理论支撑。试验结果表明,当后刀面磨损量为0.1 mm时,表面粗糙度Ra取得最小值(0.26μm)。当后刀面磨损量的范围为0~0.3 mm时,高速切削高温合金GH4169获得的平均表面显微硬度为462HV~551HV,平均表面残余应力为-1 132~-651 MPa。塑性变形层厚度和刀具磨损量的大小呈正相关,在切削参数为切削速度75 m/min、进给量0.1 mm/r、切削深度0.5 mm的条件下,当后刀面磨损量范围为0~0.3 mm时,塑性变形层的厚度为18~56μm。总地来看,表面显微硬度和残余压应力随着刀具磨损的增加而增加。表面粗糙度随着刀具磨损量的增加先减小后增加,过高的刀具磨损引起加工质量变差,合适的刀具磨损可获得更佳的表面粗糙度和表面质量,有必要通过控制刀具磨损来改善高温合金GH4169的表面完整性。Surface integrity is an important parameter to evaluate the machining quality of mechanical parts,and it has a direct impact on the service performance of mechanical parts(including corrosion resistance,wear resistance and fatigue performance).In view of the poor surface integrity when high-speed machining superalloys(also known as heat resistant superalloys),high-speed machining experiments of superalloy GH4169 were carried out to study the influence of tool wear on the surface integrity(including surface roughness,microhardness,residual stress,and microstructure)of high-speed machining superalloy GH4169,improve the surface integrity of superalloys,and provide theoretical support for high-quality machining of superalloys in the future.The experimental results show that the surface roughness Ra reaches the minimum value(0.26μm)when the flank wear is 0.1 mm.When the flank wear ranges from 0 to 0.3 mm,the average surface microhardness obtained by high-speed cutting superalloy GH4169 is 462HV-551HV,the average surface residual stress is-1132--651 MPa.The thickness of plastic deformation layer is positively related to the tool wear.When the cutting parameters are cutting speed of 75 m/min,feed rate of 0.1 mm/r,and cutting depth of 0.5 mm,the thickness of plastic deformation layer is 18-56μm when the tool wear ranges from 0 to 0.3 mm.In general,the surface microhardness and compressive residual stress increase with the increase of tool wear.The surface roughness decreases first and then increases with the increase of tool wear.Excessive tool wear causes poor processing quality.Appropriate tool wear can obtain better surface roughness and surface quality.It is necessary to improve the surface integrity of superalloy GH4169 by controlling tool wear.

关 键 词：高速切削 高温合金 表面完整性 残余应力 显微硬度 

分 类 号：TG71[金属学及工艺—刀具与模具] TG132.3[一般工业技术—材料科学与工程]