Study on Influence of Chamfer Parameters on Tool Life in Intermittent Turning of Superalloy GH4169
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摘要: 针对镍基高温合金GH4169的断续车削过程，通过单因素实验的方法，研究了硬质合金刀片刃口负倒棱参数对刀具寿命及加工表面粗糙度的影响规律。通过超景深显微镜与SEM扫描电镜分析了负倒棱参数对刀具磨损机理影响规律，利用有限元仿真从冲击应力与切削温度的角度，对实验结果进行了讨论。结果表明：在研究范围内，随着负倒棱角度与宽度的增加，刀具寿命均呈先增大后减小的趋势，而加工表面粗糙度随负倒棱参数的变化规律不明显，总体上差距不大；适当增加负倒棱角度与宽度可以减小切入切出冲击使得刀具寿命升高，但负倒棱角度与宽度过大使切削温度升高加剧了刀具磨损，从而导致刀具寿命降低。Abstract: Focusing on the intermittent turning of superalloy GH4169, the effects of the chamfer parameters in the cutting insert on the tool life and machined surface roughness by using the single factor experiment method was studied. The influences of the chamfer parameters on the tool wear mechanism were also investigated via a scanning electron microscope (SEM) and a digital microscope with super depth of field. Then the experiment results were discussed by combining the cutting impact stress and the cutting temperature obtained via finite element method. The results showed that tool life increased firstly and decreased with the increasing of chamfer angle and width, but machined surface roughness changed slightly. Properly increasing the chamfer parameters can decrease the impact stress so as to increase the tool life. But the large chamfer parameter increased significantly the cutting temperature so as to exacerbate the tool wear and decrease tool life.
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Key words:
- nickel based superalloy /
- GH4169 /
- intermittent turning /
- chamfer /
- tool life
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表 2 刀片负倒棱参数
序号 负倒棱角度β/(°) 负倒棱宽度L/mm 1 10 0.10 2 15 0.10 3 20 0.10 4 25 0.10 5 15 0.05 6 15 0.10 7 15 0.15 8 15 0.20 
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