表面处理对TiAlSiN涂层刀具表面完整性及切削性能的影响研究

涂层刀具在高速干切削钛合金时容易出现刀具磨损严重、刀具寿命短等问题，对涂层刀具进行表面处理能改善涂层刀具的表面完整性，是提高涂层刀具耐磨性和切削寿命的有效途径。选取TiAlSiN涂层刀具，分别进行深冷处理、微喷砂处理和深冷+微喷砂处理，研究不同处理方法对涂层刀具表面完整性(包括表面形貌、表面粗糙度、显微硬度和表面残余应力等)的影响，并进行钛合金高速干切削试验，分析不同处理方法对涂层刀具切削性能的影响，探究提高涂层刀具耐磨性和切削寿命的方法。结果表明：与单一深冷处理和微喷砂处理相比，深冷+微喷砂处理后涂层刀具表面完整性明显改善，刀具寿命显著提高。深冷+微喷砂处理能减少刀具崩刃、月牙洼磨损和磨粒磨损，有效提高涂层刀具耐磨性。

Effects of Surface Treatment on Surface Integrity and Cutting Performance of TiAlSiN Coated Cutting Tools

Coated tools were prone to severe tool wear and short tool life when dry cutting titanium alloys at high-speed. The surface treatment of coated tools, which might improve the surface integrity of coated tools, was an effective way to improve the wear resistance and cutting life of coated tools. The TiAlSiN coated tools were selected and treated by cryogenic treatment, micro-sandblasting treatment and cryogenic + micro-sandblasting respectively to study the effects of different treatment methods on the surface integrity of the coated tools (including surface morphology, surface roughness, micro-hardness and surface residual stress, etc.). High-speed dry cutting experiments of titanium alloys were carried out to analyse the effects of different treatment methods on the cutting performance of coated tools and to investigate ways to improve the wear resistance and cutting life of coated tools. The results indicate that compared to the single cryogenic treatment and micro-sandblasting treatment, the surface integrity of the coated tool is significantly improved and tool life is significantly increased with cryogenic + micro-sandblasting treatments. Cryogenic + micro-sandblasting treatments may reduce tool chipping, crater wear and abrasive wear, and effectively improve the wear resistance of coated tools.