磁场下磁性液体和微织构耦合作用对硬质合金刀具切削性能的影响研究

2020-10-23

作者：张靓，郭旭红，张克栋，武勇强，孟祥峰单位：苏州大学

摘要：在刀具表面加工微织构或在传统切削液中添加纳米级颗粒是提高切削效率和工件表面质量的可行方法。针对微织构易堵塞、切削液不能有效润滑等问题，在磁场辅助加工条件下，采用磁性液体作为切削液，用微织构刀具进行切削加工。使用激光加工技术在YT15硬质合金车刀前刀面加工出平行于主切削刃的沟槽型微织构（TP），并与无织构刀具（CT）进行对比；选取固含量为30%的磁性液体（MN）作为切削液，与传统切削液（CC）进行对比。在CD6140A车床上施加不同强度磁场，将磁性液体施加到切削区域进行车削试验。结果表明，微织构刀具和磁性液体（TP+MN）在不同磁场强度下的耦合效应显著；随着磁场强度的增大，微织构和磁性液体耦合能够显著降低切削力，降低工件表面粗糙度和减少刀具磨损。

关键词：表面微织构；磁性液体；切削性能；润滑膜

中图分类号：TG711；TH117文献标志码：ADOI：10.3969/j.issn.1000-7008.2020.08.003

Enhancing Cutting Performance of Uncoated Cemented Carbide Tools by

JointUse of Magnetic Liquid and Microtexture Under Magnetic Field

Zhang Liang，Guo Xuhong，Zhang Kedong，Wu Yongqiang，Meng Xiangfeng

Abstract:The fabrication of microtexture on the cutting tool surface or adding nanosized particles to conventional cutting fluids is an established way to enhance the cutting efficiency and processing quality of the machined workpieces.In view of the problems of easy blocking of microtextures and the ineffective lubrication of cutting fluids，this research proposes a new machining way for cutting microtextured tool with magnetic liquid as cutting fluids using magnetic field assisted machining.In this study，the microgrooves parallel to the main cutting edge are fabricated on the cutting tool rake face by laser processing (named TP)，and for comparison the tool without surface texturing (named CT) is also prepared.Magnetic liquid having a solid content of 30% (named MN) is prepared as coolant for machining the workpiece，and the conventional cutting fluid (named CC) is also utilized for comparison.Also，innovatively apply magnetic fields of different strengths on the CD6140A lathe and apply magnetic fluid to the cutting area for turning tests.The results show that the coupling effect between the microtextured tool and the magnetic liquid (TP+MN) under different magnetic field strengths is significant.With the increase of the magnetic field strength，the coupling of microtexture and magnetic fluid can significantly reduce the cutting force，reduce the surface roughness of the workpiece and reduce the tool wear.

Keywords:surface microtexture；magnetic liquid；cutting performance；lubricating film