摘要
目的研究微织构刀具在不同切削速度下切削力的变化规律,从而改善刀具的切削性能。方法利用激光技术在PCBN刀具前刀面进行微织构处理,加工微槽宽度分别为30、40μm的垂直微槽和平行微槽,并选择60、72、85m/min三种不同的切削速度,分别用微织构PCBN刀具干式切削AISI52100材料,使用测力仪收集切削过程产生的主切削力、径向力和轴向力。结合有限元仿真技术,设置与实际切削试验相同的切削用量、微织构刀具材料和工件材料等切削条件,从刀具表面应力角度分析微织构刀具在不同切削速度下的切削力变化,并与切削试验结果进行对比。结果在不同的切削速度条件下,不同微织构刀具产生的切削力受切削速度的影响程度不同。30μm垂直微槽和40μm平行微槽PCBN刀具在较高的切削速度下均能取得较小的切削力,切削速度的变化对主切削力、径向力和轴向力的影响均较大。结论随着切削速度的增大,垂直微槽和平行微槽可有效减小主切削力和径向力。在相同的切削速度下,垂直微槽比与平行微槽更有利于获得较小的切削力。试验结果对微织构PCBN刀具切削淬硬钢材料奠定了基础。
The work aims to study the variation rules of cutting force of micro-textured tool at different cutting speed, thus improving the cutting performance of tools. Laser technology was used to process the micro textures on the rake face of PCBN tools to fabricate 30 μm perpendicular micro groove and 40 μm parallel micro groove. The main cutting force, radial force and axial force produced in the cutting process were collected by dynamometer at cutting speed v=60 m/min, v=72 m/min and v=85 m/min when micro-textured PCBN tools were used to dry-cut AISI 52100 material respectively. Moreover, the cutting conditions same as the actual cutting tests such as cutting parameters, micro-textured tool materials and workpiece materials were set up according to the finite element simulation technology so that the changes of cutting force of micro-textured tools at different cutting speed could be analyzed theoretically from stress of tool surface and the results could be compared with the cutting test results. Finally, under different cutting speed, the cutting force produced by each micro-textured tool was affected by cutting speed to different extent. Both 30 μm perpendicular micro-groove PCBN tools and 40 μm parallel micro-groove PCBN tools could obtain smaller cutting force at higher cutting speed, and the change of cutting speed had greater influence on the main cutting force, radial force and axial force. Perpendicular micro groove and parallel micro groove can effectively reduce the main cutting force and radial force along with the increase of cutting speed. At the same cutting speed, perpendicular micro groove can obtain smaller cutting force when compared with parallel micro groove. The results lay a foundation for cutting AISI 52100 materials with micro-textured PCBN tools.
作者
李庆华
潘晨
矫雨芯
胡恺星
LI Qing-hua;PAN Chen;JIAO Yu-xin;HU Kai-xing(School of Machinery and Vehicle Engineering, Changchun University, Changchun 130022, China)
出处
《表面技术》
EI
CAS
CSCD
北大核心
2019年第8期90-97,共8页
Surface Technology
基金
吉林省科技厅重点科技研发展项目(2018B0201066GX)~~
关键词
微织构刀具
切削速度
主切削力
径向力
轴向力
micro-textured tool
cutting speed
main cutting force
radial force
axial force
