微细侧铣过程的有限元建模与仿真（英文）

发布时间：2018-07-23 17:54

【摘要】：建立了AISI 4340微细侧铣的二维有限元模型。将Johnson-Cook本构模型与JohnsonCook剪切失效模型相结合,对铣削刃旋转过程中的一个完整侧铣周期进行了仿真。由于没有考虑尺寸效应的影响,所得到的流动应力值偏小。因此,建立了应变梯度塑性模型,并应用其预测了切屑的形成、冯米斯应力和温度场。仿真结果显示:微细侧铣过程中存在尺度效应,与Johnson-Cook本构模型相比,应变梯度塑性模型能够很好地描述微细侧铣过程中的尺寸效应。最后,将仿真结果与理论计算结果相比较,验证了所建模型的正确性。
[Abstract]:A two-dimensional finite element model of AISI 4340 micro-side milling is established. The Johnson-Cook constitutive model and the JohnsonCook shear failure model are combined to simulate a complete side milling cycle in the process of milling edge rotation. Because the size effect is not considered, the flow stress is smaller. Therefore, a strain gradient plastic model is established and applied to predict chip formation, Vonmins stress and temperature field. The simulation results show that there is a scale effect in the process of micro side milling. Compared with the Johnson-Cook constitutive model, the strain gradient plastic model can well describe the size effect in the process of micro side milling. Finally, the correctness of the model is verified by comparing the simulation results with the theoretical results.
【作者单位】：重庆科技学院机械与动力工程学院;中核核电运行管理有限公司;
【基金】：supported by Chongqing Research Program of Basic Research and Frontier Technology (No.cstc2013jcyj A70004) Scientific and Technological Research Program of Chongqing Municipal Education Commission (No.KJ1501314 ) Chongqing University of Science & Technology (No.CK2014Z27)
【分类号】：TG54

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