强流脉冲电子束表面改性硬质合金刀具的响应面法优化研究  

Surface Modification of High Current Pulsed Electron Beam on Cemented Carbide Tools Using Response Surface Methodology

作　　者：吕逍[1] 张尧[1] 娄长胜[1] 李国建[2] 王强 

机构地区：[1]沈阳理工大学材料科学与工程学院,辽宁沈阳110159 [2]东北大学材料电磁过程研究教育部重点实验室,辽宁沈阳110819

出　　处：《稀有金属》2015年第2期152-158,共7页Chinese Journal of Rare Metals

基　　金：国家科技重大专项项目(2012ZX04003-061)资助

摘　　要：强流束脉冲电子束辐照参数对提高硬质合金刀具切削性能至关重要。本文基于响应面法(RSM)分析了硬质合金刀具在强流脉冲电子束表面改性过程中输入电压、电流和脉冲次数对刀具表面粗糙度和硬度的影响,结合回归统计建立了硬质合金刀具表面粗糙度和硬度的经验公式,揭示了影响刀具切削性能的主导因素,找出输入电压、电流和脉冲次数对刀具切削性能的最佳综合作用效果。结果表明,强流脉冲电子束辐照过程中的输入电压、电流和脉冲次数对刀具表面粗糙度和硬度均具有显著影响。通过建立的表面粗糙度和硬度对输入电压、输入电流和脉冲次数的多元响应面函数,得出最佳优化参数,在此条件下,刀具表面粗糙度为0.167μm,显微硬度值为HV2206。由于强流脉冲电子束辐照降低了刀具表面粗糙度,同时提高了表面硬度,在切削钛合金试验过程中,发现经过电子束辐照,刀具的抗磨损性能显著提高。Irradiation parameters of high current pulsed electron beam are vital to enhance the cutting properties of cemented carbide tools. The effect of input voltage, current and pulse times on surface roughness and hardness during the surface modification of high current pulsed electron beam on cemented carbide tools using response surface methodology （RSM） was analyzed, and the empirical formula of surface roughness and hardness of cemented carbide tools was established according to regression statistics ; furthermore, the main factor which had influences on cutting performance was revealed and the best comprehensive effect of input voltage, current and pulse times on cutting performance was obtained. The results showed that the effects of input voltage, current and pulse times during ir- radiation of high current pulsed electron beam on the surface roughness and hardness of tools were significant. The optimal parameters were presented by establishing polynomial equation of response surface methodology between input voltage, current, pulse times, roughness and hardness, and the value of surface roughness was 0. 167 μm and mierohardness was HV2206 in this condition. As the surface roughness was reduced and the hardness was increased by irradiation of high current pulsed electron beam on tools, the wear re- sistance of tools after irradiation was enhanced during the experiment of cutting titanium alloys.

关 键 词：硬质合金 强脉冲电子束 响应面 切削性能 

分 类 号：TG506[金属学及工艺—金属切削加工及机床]