硬质合金刀具铣削镍基单晶高温合金DD5磨损试验

摘要 为探究在干切削和水基微量润滑(WMQL)条件下刀具磨损对DD5铣削表面质量的影响规律，采用四刃PVD-TiAlN涂层硬质合金刀具以及超景深显微镜和扫描电镜等设备，以刀具副后刀面磨损宽度为主要评价指标，对硬质合金刀具副后刀面磨损形态、磨损机理进行分析和研究，并采用三维轮廓仪对零件表面粗糙度进行测量.研究结果表明，与干切削相比，采用水基微量润滑冷却技术，能够延长刀具寿命并改善材料的铣削加工性;硬质合金刀具的主要磨损机理为粘结磨损、磨粒磨损、氧化磨损和扩散磨损.
Abstract：To explore the regulation of tool wear on milling surface of DD5 under the conditions of dry cutting and water-based minimum quantity lubrication(WMQL)， carbide tool with four blades and PVD-TiAlN coating， super depth of field microscope and scanning electron microscopy(SEM)were employed. Taking the wear width of minor flank surface of cutting tool as the evaluation indicator， tool wear forms and wear mechanism were analyzed and studied. Three-dimensional measuring system profiler was used to measure the machined surface roughness. The result shows that， compared to dry cutting， water-based MQL technology can prolong tool life and improve the milling performance. The wear of carbide tool is caused by adhesion wear， oxidative wear， abrasive wear and diffusion wear.