集成对称模糊数及有限元法的切削力预测

The Cutting Force Predication Based on Integration of Symmetric Fuzzy Number and Finite Element Method

利用对称模糊数及有限元法,对切削力不确定范围进行了定量的预测。在对切削力影响因素分析的基础上,选取切削速度、背吃刀量和进给量等3个影响因素。结合切削力实测数据,确定了切削力与这3个影响因素之间的模糊函数关系,并依据此函数关系给出了切削力不确定区间。同时,利用热力耦合有限元法仿真出切削力随时间的变化曲线以及因热力耦合作用下工件、刀具和切屑中的非均匀应力场、温度场的分布情况。预测结果表明,该方法在考虑影响切削力因素的基础上能较好地预测切削力不确定范围,使得预测结果更符合实际情况。

Using the symmetric fuzzy number and finite element method,the uncertain scope of cutting force is quantitatively calculated.The cutting speed and back engagement of the cutting edge and feed are selected,and the ambiguity function relation of the cutting force and the three influencing factors are decided by combing the measured data of the cutting force.The uncertain region of the cutting force is given according to this function relation.At the same time,the curve showing the change of cutting force following time is simulated using the thermal-mechanical finite element method.In addition,the distributions of non uniform stress field and temperature field in the workpiece,cutter,and scraps are simulated,which are caused by thermal mechanical coupling.The predicted results show that this method can better predict the uncertain scope of cutting force based on the influence of the cutting force,and the predicted results are more consistent with the actual situation.