Numerical Computation Methods for Modeling the Phenomenon of Tool Extraction
Numerical Computation Methods for Modeling the Phenomenon of Tool Extraction
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工具提取现象建模的数值计算方法
DOI：
10.1007/978-3-642-32448-2_13
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发表时间：
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期刊：
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通讯作者：
Andres
中科院分区：
文献类型：
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作者：
Denkena;Stephan;Maischak;Möhring;Heinisch;Andres
拔刀是指在切割过程中，立铣刀沿轴向滑出热配合卡盘的现象。这会严重损坏工件、刀具，在某些情况下甚至会损坏机床主轴。到目前为止，这是一个无法解释的问题，没有重复性。本文介绍了刀具拔出对热配合卡盘夹紧面残余应力影响的扫描电子显微镜和残余应力测量等实验研究结果。此外，还描述了在一种特殊的试验台上的实验结果和一种数学方法，该方法旨在预测由于过程机器相互作用而导致的故障。在数学方法中，刀具和刀架的有限元模型与切削力模拟相联系。主轴的动态行为由频率响应函数测量确定。根据这些测量结果，推导出一个模态模型，并将其与刀架的有限元模型进行耦合。所提出的数学模型被用来计算由于过程力在这些部件的界面上产生的应力。
Tool extraction is a phenomenon, where the end mill slips out of the shrink-fit chuck in axial direction during the cutting process. This leads to severe damage of the workpiece, the tool and in some cases even the machine spindle. So far, this is an unexplained problem with no repeatability. In this article, experimental investigations such as scanning electron microscopy (SEM) and residual stress measurements on the clamping surface of shrink-fit chucks affected by tool extraction are presented. Furthermore, results from experiments on a special testrig and a mathematical approach, which aims at the prediction of failures due to Process Machine Interaction, are described. Within the mathematical approach, a finite element model of the tool and the tool holder is linked with a cutting force simulation. The dynamic behavior of the spindle is determined by frequency response function measurements. From these measurements, a modal model is deduced and coupled with the finite element model of the tool holder. The presented mathematical model is used to compute the resulting stresses in the interface of those components due to process forces.