The chip-flow behaviors and formation mechanisms in the orthogonal cutting process of Ti6Al4V alloy.
The chip-flow behaviors and formation mechanisms in the orthogonal cutting process of Ti6Al4V alloy.
复制标题
Ti6Al4V合金正交切削过程中切屑流动行为及形成机制
DOI：
10.1016/j.jmps
复制
发表时间：
2017
影响因子：
5.3
通讯作者：
Fei Shuang
中科院分区：
文献类型：
--
作者：
Wei Ma;Xiangyu Chen;Fei Shuang
本文对金属切削过程中的切屑流动稳定性进行了实验和分析研究。首先，在Ti6Al4V合金的切削试验中，观察到切屑形态随切削速度的增加由连续→锯齿→不连续的变化。剪切断口的扫描电子显微镜（SEM）观察显示了剪切局部失稳和沿晶破坏行为。然后用改进的正交切削模型（OCM）分析了平面应变状态下工件的塑性流动过程。materials.in建立了相应的控制方程组，通过量纲分析确定了无量纲控制参数，并通过线性摄动分析建立了失稳判据。分析结果表明，切屑流的塑性失稳不同于锯齿形切屑的剪切局部失稳，而是在连续切屑中发生。最后，根据表面能与切屑生长的平衡条件，研究了锯齿形切屑的生长行为和不连续切屑的形成机理。kinetic.energy
This work involves experimental and analytical investigations of chip flow stability in metal.cutting process. First, in cutting experiments of Ti6Al4V alloy, the transformation of chip.morphology from continuous to serrated and later to discontinuous was observed as the cutting.speed increased. Scanning electron microscopic (SEM) observation of the shear fracture surface.demonstrated shear-localized instability and intergranular failure behaviors. Then we used the.improved orthogonal cutting model (OCM) to analyze the plastic flow process of work materials.in a plane strain state. A corresponding governing equation system was set up, the dimensionless.governing parameters were determined by dimensional analysis, and an instability criterion was.established by linear perturbation analysis. Analytical results showed that the plastic instability.of chip flow could take place in a continuous chip, which is different from the shear-localized.instability in a serrated chip. Finally, in terms of the balance conditions between the kinetic.energy and the surface energy, the sawtooth growth behavior in serrated chips and the formation.mechanism of discontinuous chips were studied.