【摘要】 采用响应面设计方法对TiAlN涂层刀具强流脉冲电子束表面后处理工艺进行优化设计,结合回归统计建立硬质合金涂层刀具的表面粗糙度、硬度以及弹性模量数学模型。此外,分别对三个数学模型进行显著性分析,以揭示输入电压、输入电流和脉冲次数对涂层刀具表面粗糙度、硬度及弹性模量的影响。结果表明,强流脉冲电子束轰击过程中的输入电压、输入电流和脉冲次数对涂层刀具的表面粗糙度、硬度以及弹性模量均具有显著影响。通过多响应值进行优化,得到了最佳工艺参数组合。经此工艺条件处理后的TiAlN刀具表面粗糙度为0.17μm、显微硬度为33.39 GPa、弹性模量为660.20 GPa;切削实验结果表明,经处理后的TiAlN涂层刀具后刀面磨损量较未经处理的下降了60%左右。更多还原

【Abstract】 The surfaces of the TiAlN-coated carbide tools were modified by bombardment of high current pulsed electron beam. The influence of the modification conditions,including but not limited to the driving voltage,pulsed current and pulse-number,on the mechanical behavior of the carbide tool was investigated in Response Surface Methodology( RSM) with self-developed models for process optimization. The results show that the surface modification significantly improves the microstructures and mechanical properties of the TiAlN-coated carbide tools.To be specific,modified at a driving voltage of 11. 7 k V and a pulsed current of 71. 5 A and for 20 pulses,the surface roughness was decreased to 0. 17 μm,the micro-hardness was increased to 33. 3 GPa,and the elastic modulus was increased to 660. 20 GPa. In addition,the flank wear was found to decrease roughly by 60% in the tests of the TiAlN-coated carbide cutting tools with and without modification.更多还原