切削参数对ZrO_(2)陶瓷切削过程影响的数值模拟  

Numerical simulation of the influence of cutting parameters on the cutting process of ZrO_(2)ceramics

作　　者：吕世聪 刘寅 孙兴伟[1,2] 董祉序 杨赫然 张维锋[1,2] LV Shicong;LIU Yin;SUN Xingwei;DONG Zhixu;YANG Heran;ZHANG Weifeng(School of Mechanical Engineering,Shenyang University of Technology,Shenyang 110870,China;Key Laboratory of Numerical Control Manufacturing Technology for Complex Surfaces of Liaoning Province,Shenyang 110870,China)

机构地区：[1]沈阳工业大学机械工程学院,沈阳110870 [2]辽宁省复杂曲面数控制造技术重点实验室,沈阳110870

出　　处：《金刚石与磨料磨具工程》2024年第6期769-780,共12页Diamond & Abrasives Engineering

基　　金：国家自然科学基金(52005346,52005347);辽宁省应用基础研究计划项目(2022JH2/101300214);辽宁省自然科学基金计划项目(2021-BS-149);辽宁省教育厅科学研究经费项目(LQGD2020017)。

摘　　要：采用有限元仿真方法对ZrO_(2)陶瓷工件进行三维切削过程的数值模拟,探讨工件材料切削过程中切屑去除机理、应力动态变化与分布规律以及切削力的演变规律等。结果表明:切削过程中刀具的硬接触行为显著影响材料去除,导致切屑崩落、材料开裂和裂纹扩展等失效形式出现。在切削深度分别为200和250μm时,工件末端边缘出现大量裂纹,并朝垂直切削方向扩展,导致工件边缘出现大尺寸碎裂。增大切削速度可引起应力和切削力的上下波动,但在整体上没有明显变化。刀具刃圆半径影响切入初期裂纹的形成,随着刃圆半径增大,刀具前端的裂纹长度逐渐缩短,但其对切削力的影响不明显。负的刀具前角切削不会使工件内部产生裂纹,可获得较好的加工质量;此外,在刀具前角为0°时,其最大切削力最大,但随着刀具前角增加,其平均切削力变化不明显。Objectives:Research on ceramic processing primarily focuses on areas such as single abrasive grinding methods,processing mechanisms,processing efficiency,material removal mechanisms,and surface quality.However,research on ZrO_(2)ceramic cutting processing is relatively insufficient.Therefore,the 3D cutting process of ZrO_(2)ceramic workpieces was numerically simulated using the finite element simulation method.The study discusses the mechanism of chip removal,the dynamic change and distribution of stress,and the evolution law of cutting force under various cutting conditions.Methods:The 3D cutting process of ZrO_(2)ceramic workpieces,under different machining parameters and tool parameters,was numerically simulated using the finite element simulation method.The cutting forces under various feed speeds and cutting depths were compared to explore the failure modes and material removal mechanisms of ZrO_(2)ceramic during the cutting process.Results:The hard contact behavior between the cutting tool and the workpiece significantly affects the material removal process,leading to failure modes such as chip collapse,material cracking,and crack propagation.When the cutting depth is 200μm or 250μm,numerous cracks appear at the end edge of the workpiece and expand in the vertical cutting direction,resulting in significant fragmentation at the edge.An increase in cutting speed will causes fluctuations in stress and cutting force,but overall,there is no significant change in cutting performance.The radius of the cutting edge affects the formation of cracks in the initial cutting stage.As the edge radius increases,the length of the crack at the front end of the tool shortens,though the impact on cutting force is not significant.A negative tool rake angle during cutting does not induce cracks in the workpiece,and it leads to better machining quality.In addition,when the tool rake angle is 0°,the maximum cutting force increases rapidly,but the cutting force variation is not obvious with increasing rake angle.Conclusions:As t

关 键 词：ZrO_(2)陶瓷 有限元仿真 切削深度 刃圆半径 刀具前角 切削速度 

分 类 号：TG58[金属学及工艺—金属切削加工及机床] TG71