Study on mechanism of chip formation during high-speed milling of alloy cast iron
Study on mechanism of chip formation during high-speed milling of alloy cast iron
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DOI：
10.1007/s00170-009-2064-1
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
Yan Yang;Jianmin Li
中科院分区：
文献类型：
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作者：
Yan Yang;Jianmin Li
采用切屑等效几何模型，建立了合金铸铁高速铣削切屑形成机理的有限元模型。为提高有限元仿真的精度，实现了材料本构模型、摩擦模型、切屑分离准则、切屑损伤准则、散热和传热等关键技术。观察到合金铸铁的锯齿状切屑。切屑形状和切削力与实验结果吻合较好。仿真结果表明，锯齿形切屑裂纹出现时切削温度最高，且最高温度位于切屑与刀具的接触面上。锯齿形切屑是由热塑性失稳和塑性失稳的双重作用引起的。切屑锯齿度随转速的增大而减小，随进给速度的增大而增大。研究结果为合金铸铁高速铣削加工中切屑的形成过程提供了有益的认识，有助于优化合金铸铁高速铣削加工参数和工艺。
By adopting an equivalent geometry model of chip, a finite element model was developed to study the mechanism of chip formation during high-speed milling of alloy cast iron. Several key technologies such as material constitutive model, friction model, chip separation criteria, chip damage criteria, heat dissipation, and transfer were implemented to improve the accuracy of finite element simulation. Saw-tooth chip of alloy cast iron was observed. The chip shape and cutting force agreed well with experimental results. The simulation results show that the maximum cutting temperature produced with appearance of saw-tooth chip crack, and it is located on the chip-tool contact surface. The saw-tooth chip is caused by double actions of thermoplastic instability and plastic instability. The chip saw-tooth degree decreases when increasing the rotating speed, while it increases when increasing the feed speed. This work provides a useful understanding for chip formation process and helps to optimize machining parameters and process of high-speed milling of alloy cast iron.