Cutting edge orthogonal contact-zone analysis using detailed tool shape representation
Cutting edge orthogonal contact-zone analysis using detailed tool shape representation
复制标题
使用详细的刀具形状表示进行切削刃正交接触区分析
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
B. Denkena
中科院分区：
文献类型：
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作者：
V. Böß;D. Niederwestberg;Christoph Ammermann;B. Denkena
提出了一种基于数控仿真的切削过程刀-工件接触区数值分析的新方法。为了获得有关刀具-工件相互作用的更深入的知识，切屑厚度、接触长度以及由此产生的未变形切屑的横截面积的确定具有重要意义。与使用旋转对称构造的刀具形状的常见模拟方法相比，新方法使用详细的三维刀具形状模型进行扩展和更准确的接触区分析。作为工件及其随时间变化的形状的对应表示，使用多深度模型。为了执行接触区分析，每个切削元素和多维度模型被嵌入到与刀具旋转相对应的离散时间步长中。随后，将每个深度元素的交点映射到切割几何的局部坐标系上。参数化切割几何允许直接计算每个相关点的局部切割深度和接触长度。基于未变形切屑的接触长度和横截面积的局部值，计算整个接触区的特征值，并用于预测切削过程引起的机械载荷。为了演示新方法的应用，提出了1.1191钢（C45 EN）的槽铣和钻削力的预测。
A new method for numerically controlled (NC)-simulation-based numerical analysis of the tool-workpiece contact area in cutting processes is presented. To gain enhanced knowledge about tool-workpiece interaction, determination of chip thickness, contact length, and resulting cross-section area of the undeformed chip is of major interest. Compared to common simulation approaches, where rotationally symmetrically constructed tool shape is used, the new method uses a detailed three-dimensional tool shape model for an extended and more accurate contact zone analysis. As a corresponding representation of the workpiece and its time-dependent change of shape, a multidexel model is used. To perform contact zone analysis, each cutting element and a multidexel model are intersected in discrete time steps corresponding to the tool rotation. Subsequently, the intersection point of each dexel is mapped on the local coordinate system of the cutting geometry. The parametric cutting geometry allows a direct computation of local cutting depth and contact length for each involved point. Based on the local values of contact length and cross section area of the undeformed chip, the characteristic values for the entire contact zone are calculated and used to predict mechanical loads caused by the cutting process. To demonstrate the application of the novel approach, a prediction of forces in slot milling and drilling of 1.1191 steel (C45EN) is presented.