Steady tool wear and its influence on tool geometry in ultra-precision fly cutting of CuZn30
Steady tool wear and its influence on tool geometry in ultra-precision fly cutting of CuZn30
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CuZn30超精密飞削刀具稳态磨损及其对刀具几何形状的影响
DOI：
10.1007/s00170-018-3111-6
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发表时间：
2018-12
影响因子：
3.4
通讯作者：
Yan Lou
中科院分区：
文献类型：
--
作者：
Guoqing Zhang;Suet To;Xiaoyu Wu;Yan Lou
在超精密飞切 (UPFC) 中，切削延性材料时，刀具的稳定磨损会逐渐进展。金刚石刀具的稳定磨损会改变刀具的几何形状，并进一步影响加工表面的形貌。在本研究中，对 UPFC 中刀具稳定磨损的形式及其对刀具几何形状的影响进行了理论和实验研究。研究了 UPFC 中刀具稳态磨损的特征，对刀具后刀面磨损影响下的切削刃位移进行了建模，并研究了影响切削刃圆度的因素。研究结果表明：(1)UPFC刀具稳态磨损特征包括前刀面月牙洼磨损、切削刃光滑平坦磨损和刀具后隙面后刀面磨损。 (2) 切削刃上的光滑磨损带会改变刀具的前角，而刀具后隙面上的后刀面磨损会影响切削刃的后角和圆度。 (3)刀具材料损失区的最大宽度、原新切削刃的刀尖半径、磨损带的圆弧角对磨损切削刃的刀尖半径有一定的影响。这项研究的结果将深入了解刀具的稳定磨损及其对刀具几何形状的影响，这有可能用于预测或评估刀具稳定磨损下加工表面的光洁度。
In ultra-precision fly cutting (UPFC), steady tool wear progresses gradually when cutting ductile materials. The steady wear of diamond tools changes the tool geometry, and further affects the topography of the machined surface. In this study, a theoretical and experimental investigation was conducted on the forms of steady tool wear and their influence on the tool geometry in UPFC. The features of steady tool wear in UPFC were investigated, the displacement of the cutting edge under the effects of tool flank wear was modeled, and factors affecting the cutting edge roundness were investigated. The study results indicate the following: (1) the features of steady tool wear in UPFC include crater wear on the rake face, smooth and flat wear on the cutting edge, and flank wear on the tool clearance face. (2) A smooth wear-land on the cutting edge changes the top rake of the cutting tools, whereas flank wear on the tool clearance face affects the clearance angle and roundness of the cutting edge. (3) The maximum width of the tool material loss zone, the nose radius of the original fresh cutting edge, and the arc angle of the wear-land have a certain influence on the nose radius of the worn cutting edge. The results of this study will provide deep insight into steady tool wear and its influence on the tool geometry, which can potentially be used to predict or evaluate the finish of a machined surface under tool steady wear.
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