基于有限元的前刀面应力分布研究

Study on stress distribution of rake face based on finite element method

利用有限元方法研究切削加工过程中刀具与切屑的接触区域内前刀面应力分布,发现接触区域的摩擦系数和最大切应力值的选取与接触表面信息有关。结果表明:从刀尖到刀屑分离点处,前刀面应力呈快速下降缓慢降低明显下降的过程;切削厚度对应力分布有较大影响,当切削厚度为0.13mm时应力曲线不再出现缓慢降低的过程;切削速度对应力分布、接触长度和切屑厚度的影响较小。

The stress distribution of the contact area between tool and chip on tool rake face when cutting is studied by finite element method.The friction coefficient and the maximum shear stress are related to the contact condition at the interface.Results show that from tool tip to the separation point of chips,the stress decreases quickly at first,then slowly,and quickly again.It is also found that the cutting depth has great influence on stress distribution,and that there is no slow decrease period of stress curve at cutting depth of 0.13 mm.Meanwhile,cutting speed has limited influence on stress distribution,contact length and chip thickness.