电加工8418钢的能量分配与表面粗糙度模型

发布时间：2018-03-12 21:52

本文选题：钢　切入点：表面粗糙度　出处：《材料导报》2017年14期 　论文类型：期刊论文

【摘要】：针对电火花加工8418钢构建一种采用不同电极材料加工时的表面粗度模型。采用实验与有限元仿真分析相结合的手段,首先通过实验分别得到紫铜电极、CuW70电极加工8418钢的表面粗糙度Ra,然后采用ANSYS软件仿真分析单脉冲放电加工8418钢的电蚀凹坑半径与深度,结合表面粗糙度模型计算出仿真Ra,通过对比实验得到的表面粗糙度Ra,分析得出紫铜电极、CuW70电极加工8418钢时工件上的能量分配系数η分别为33%和24%。最后对能量分配系数和表面粗度模型进行了实验验证,通过误差分析,不同电极加工的表面粗糙度最大误差为9.59%,证明了能量分配系数和表面粗度模型是准确的。通过对比实验和分析结果,得出不同电极材料对能量分配系数的影响,同时随着脉冲放电能量的增加,η对凹坑半径与深度的影响增大,采用紫铜电极与CuW70电极加工8418钢时Ra差异增大。
[Abstract]:A surface coarseness model was constructed for EDM 8418 steel with different electrode materials. The method of combining experiment with finite element simulation analysis was used. The surface roughness Ra. of 8418 steel machined with copper electrode CuW70 was obtained by experiments, and the electroetching pit radius and depth of 8418 steel were simulated by ANSYS software. In combination with the surface roughness model, the simulated Ra. by comparing the surface roughness Raobtained from the experiments, the energy distribution coefficient 畏 of the workpiece processed with copper electrode CuW70 electrode is 33% and 24, respectively. Finally, the energy distribution is obtained. The coefficient and surface coarseness model are verified by experiments. Through error analysis, the maximum error of surface roughness of different electrode machining is 9.59, which proves that the energy distribution coefficient and surface coarseness model are accurate. The effects of different electrode materials on energy distribution coefficient are obtained by comparing the experimental and analytical results. At the same time, with the increase of pulse discharge energy, the effect of 畏 on pit radius and depth increases, and the Ra difference increases when copper electrode and CuW70 electrode are used to process 8418 steel.
【作者单位】：湖南大学机械与运载工程学院;
【基金】：湖南省自然科学基金(2015JJ2026) 国家自然科学基金(51275165)
【分类号】：TG142.1;TG661

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