刀片钝化半径对高温合金切削质量影响的研究

2020-10-16

作者：张高峰1，康银乐1，王社权2，章伟2，黄威武2，鲁炎鑫2 单位：1湘潭大学机械工程学院；2株洲钻石切削刀具股份有限公司

摘要：通过不同钝化半径的刀具对GH4169高温合金进行车削正交试验，结果表明：随着钝化半径的增加，表面残余应力先降低后增加；工件环向残余应力随着钝化半径的增加，工件内部残余压应力最大值增大，影响深度随之增加。由表面粗糙度和表面残余应力的敏感程度可知，进给量是影响表面完整性的最主要因素，其次是切削速度和切削深度。分析了不同钝化半径和切削参数对表面完整性特征的影响规律，建立了表面粗糙度表面残余应力的经验公式，得到了用于精加工GH4169高温合金较好的钝化半径范围0.02～0.03mm，以及较优的切削参数vc=60～70m/min，fn=0.05～0.075mm/r，ap=0.2～0.5mm。

关键词：GH4169；钝化半径；表面粗糙度；残余应力

中图分类号：TG707；TH161文献标志码：ADOI：10.3969/j.issn.1000-7008.2020.03.003

Study on Effect of Blade Roundness Radius on Cutting Quality of Superalloy

Zhang Gaofeng，Kang Yinle，Wang Shequan，Zhang Wei，Huang Weiwu，Lu Yanxin

Abstract:The turning orthogonal experiment of superalloy GH4169 is carried out with tools with different roundness radius.The results show that the surface residual stress decreased at first and then increased with the increase of roundness radius. With the increase of the circumferential residual stress of the workpiece，the maximum residual compressive stress in the workpiece increases，and the influence depth increases with the increasing of the circumferential residual stress of the workpiece.The sensitivity to surface roughness and surface residual stress shows that feed rate is the most important factor affecting surface integrity，followed by cutting speed and cutting depth.The effects of different roundness radius and cutting parameters on the surface integrity characteristics are analyzed，the empirical formula of surface residual stress of surface roughness is established，and the better roundness radius range of 0.02mm to 0.03mm for finishing GH4169 is obtained，the better cutting parameter vc=60~70m/min，fn=0.05~0.075mm/r，ap=0.2~0.5mm.

Keywords:GH4169；roundness radius；surface roughness；residual stress