TiAlN涂层硬质合金刀具铣削4J32低膨胀合金的磨损机理分析
2019-08-30
作者：刘胤1，王金星1，张德玉1，杨齐慧1，何大伟2，王砾晟1
单位：1北京自动化控制设备研究所；2株洲钻石切削刀具股份有限公司
摘要：采用国产TiAlN涂层硬质合金刀具，分别以切削速度50.868m/min和99.852m/min对4J32低膨胀合金进行单向顺铣侧铣切削。当材料表面粗糙度接近或达到1.6μm时停止切削，利用扫描电子显微镜和X射线能谱仪观察硬质合金刀具的典型微观形貌，并分析其磨损机理。研究结果表明：TiAlN涂层硬质合金前刀面积屑瘤粘结严重，且伴有局部崩刃现象；当切削速度增大时，积屑瘤表面轮廓粗糙度加剧，局部会出现“花瓣状”和“云层状”切屑粘结物；刀具前刀面的磨损机理主要为扩散磨损、粘结磨损和氧化磨损，并伴有崩刃的破损机理；后刀面发生微量氧化磨损。
关键词：TiAlN涂层；4J32；硬质合金；低膨胀合金；磨损机理
中图分类号：TG501；TH161文献标志码：ADOI：10.3969/j.issn.1000-7008.2019.09.011
Wear Mechanism Analysis of TiAlN Coated Carbide Cutter
in Milling of 4J32 Low Expansion Alloy
Liu Yin，Wang Jinxing，Zhang Deyu，Yang Qihui，He Dawei，Wang Licheng
Abstract:The domestic TiAlN coated carbide cutter is used to cut the 4J32 lowexpansion alloy in oneway milling and side milling process at a cutting speed of 50.868m/min and 99.852m/min.When the surface roughness of the material is close to or reaches 1.6μm，the cutting is stopped.Electron microscope (SEM) and Xray energy spectrometer (XEDS) scanning are used to observe the typical microstructure of cemented carbide cutter and its wear mechanism is analyzed.The research results show that：TiAlN coated cemented carbide front blade area of the builtup edge is serious adhesion，and accompanied by local chipping edge phenomenon；when the cutting speed increases，the surface roughness of the builtup edge nodules increases；local area will appear “petal” and “cloud” chip bonding material；the wear mechanism of the tool front surface is mainly diffusion wear，bonding wear and oxidation wear and the damage mechanism of the broken edge；micro oxidation wear occurs on the back blade surface.
Keywords:TiAlN coating；4J32；carbide；lowexpansion alloy；wear mechanism