首页> 外文期刊>The International Journal of Advanced Manufacturing Technology >Preparation of tungsten disulfide (WS_2) soft-coated nano-textured self-lubricating tool and its cutting performance
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Preparation of tungsten disulfide (WS_2) soft-coated nano-textured self-lubricating tool and its cutting performance

机译:二硫化钨(WS_2)软涂层纳米织构自润滑工具的制备及其切削性能

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摘要

This paper proposes a new effective dry cutting tool named tungsten disulfide (WS_2) soft-coated nanotextured self-lubricating tool which is fabricated by two steps. First, nano-texture is made on the tool-chip interface of rake face of uncoated YS8 (WC + TiC + Co) cemented carbide cutting inserts by femtosecond laser micromachining technology. Second, WS_2 soft coating is deposited on the nano-textured tool by medium-frequency magnetron sputtering, multi-arc ion plating and ion beam assisted deposition technique. Dry turning tests on 45# quenched and tempered steel were carried out with three kinds of cutting tools: conventional YS8 tool, nano-textured tool (CFT), and WS_2 soft-coated nano-textured self-lubricating tool (CFTWS). Results show that the cutting forces, cutting temperature, the friction coefficient at the tool-chip interface, and the antiadhesive effect of the nano-textured tools were significantly reduced compared with those of the conventional one. The CFTWS tool had the best cutting performance among all the tools tested under the same test conditions. Through cutting force and cutting temperature theoretical analysis and experimental results, four mechanisms responsible were found. The first one is explained as the formation of the WS_2 lubricating film with low shear strength at the tool-chip interface, which was released from the surface nano textures and smeared on the rake face, and served as lubricating additive during dry cutting processes to reduce the cutting forces and cutting temperature. The second one is explained by the reduced contact length at the tool-chip interface of the nano-textured tools; the smaller direct contact area between the chip and tool rake face leads to less friction force, which can also contribute to the decrease of cutting forces and cutting temperature. The third one can be explained that because of the excellent lubricity of the WS_2 lubricating film, the antiadhesive effect can be significantly improved which can reduce adhesive wear of the cutting tool and prolong the tool life. The fourth one can be explained that the advantage of CFTWS tool in cutting forces and cutting temperature is obvious in relatively high-speed and high-temperature conditions may be because of ultra-low friction coefficient, high temperature resistance, and the high oxidation resistance of WS_2 soft coating which is not sensitive to high cutting temperature and high cutting speed can significantly improve the severe dry cutting environment.
机译:本文提出了一种新的有效的干式切削工具,称为二硫化钨(WS_2)软涂层纳米织构自润滑工具,该工具可通过两步制造。首先,通过飞秒激光微加工技术在未涂覆的YS8(WC + TiC + Co)硬质合金切削刀片前刀面的刀具-芯片界面上制成纳米纹理。其次,通过中频磁控溅射,多弧离子镀和离子束辅助沉积技术将WS_2软涂层沉积在纳米织构工具上。使用三种切削刀具对45#淬火和回火钢进行了干车削试验:常规Y​​S8刀具,纳米织构刀具(CFT)和WS_2软涂层纳米织构自润滑刀具(CFTWS)。结果表明,与传统工具相比,纳米纹理化工具的切削力,切削温度,工具-芯片界面处的摩擦系数以及抗粘连效果显着降低。在相同测试条件下测试的所有工具中,CFTWS工具具有最佳的切削性能。通过切削力和切削温度的理论分析和实验结果,发现了四种机理。第一种解释是在工具-切屑界面处形成了具有低剪切强度的WS_2润滑膜,该润滑膜从表面纳米纹理上释放出来并涂抹在前刀面上,并在干切削过程中用作润滑添加剂以减少切削力和切削温度。第二个是通过减少纳米纹理化工具在工具-芯片界面的接触长度来解释的。切屑和刀具前刀面之间的直接接触面积越小,摩擦力越小,这也有助于降低切削力和切削温度。第三方面可以解释为,由于WS_2润滑膜的优异润滑性,可以显着提高抗粘连效果,从而可以减少切削工具的粘着磨损并延长工具寿命。第四点可以解释,CFTWS工具在相对高速和高温条件下在切削力和切削温度方面的优势是显而易见的,这可能是由于超低摩擦系数,耐高温性和高抗氧化性造成的。 WS_2软质涂层对高切削温度和高切削速度不敏感,可以显着改善恶劣的干切削环境。

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