On Saw-Tooth Chip Formation in High Speed Cutting GH4169
On Saw-Tooth Chip Formation in High Speed Cutting GH4169
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DOI：
10.4028/www.scientific.net/amm.10-12.359
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发表时间：
2007-12
期刊：
影响因子：
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通讯作者：
D. Zhang;Gang Liu;X. Sun;Ming Chen
中科院分区：
文献类型：
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作者：
D. Zhang;Gang Liu;X. Sun;Ming Chen
镍基高温合金GH4169是一种典型的难切削材料，由于其在650℃以下具有较高的屈服应力和抗疲劳性能，已被广泛应用于多种航空关键结构中。本文采用有限元方法对镍基高温合金GH4169加工时的锯齿形切屑形成过程进行了详细的研究。采用拉格朗日粘弹塑性方法，采用通用商用有限元程序对高速加工条件下的绝热剪切带进行了数值模拟，并利用有限元分析方法分析了主剪切带绝热剪切现象的产生机理。并对不同切削速度下的锯齿形切屑形貌进行了综合比较。
The nickel-based superalloy GH4169 is a typical difficult-to-cut material, but it has been used in a good many kinds of aeronautical key structures because of its high yield stress and anti-fatigue performance at the temperature below 650°C. In this paper, finite element method (FEM) was introduced to study the saw-tooth chip forming process in detail when machining nickel-based superalloy GH4169. By the way of Lagrangian visco-elastic plastic approach, adiabatic shear band (ASB) was simulated in high speed machining condition by general commercial finite element code, and the mechanism of the adiabatic shearing phenomenon at primary shear zone was analyzed with the help of finite element analysis (FEA). The comprehensive comparisons of saw-tooth chip morphology under a wide range of cutting speed were also presented.