An analytical force model for orthogonal elliptical vibration cutting technique
An analytical force model for orthogonal elliptical vibration cutting technique
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DOI：
10.1016/j.jmapro.2012.05.006
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发表时间：
2012-08
影响因子：
6.2
通讯作者：
Xinquan Zhang;A. Kumar;Mustafizur Rahman;Chandra Nath;Kui Liu
中科院分区：
文献类型：
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作者：
Xinquan Zhang;A. Kumar;Mustafizur Rahman;Chandra Nath;Kui Liu
椭圆振动切割(EVC)技术被认为是一种很有前途的超精密加工技术。在每个重叠的EVC循环中，被加工材料的切割厚度(TOC)和刀具速度都是连续变化的。事实上，这两种固有现象将瞬变特性引入到了它的切割机理中，这被认为是不同于传统切割技术的。近年来，已有一些理论模型被用来理解EVC技术的材料去除机理，但在这些研究中，没有考虑暂态现象。为了全面了解消失模铸造的机理，更准确地预测瞬时切削力值，本文建立了正交型消失模铸造过程的解析力模型。主要基于几何建模和Lee和Shaffer滑移线解，研究和分析了三个重要因素：(I)瞬时TOC，(Ii)瞬时剪切角，(Iii)摩擦反转的过渡特性。数学评估表明，它们可能会对EVC过程产生重大影响，从而影响其输出性能。为了验证所提出的力模型，进行了一系列低频正交式EVC试验。将实验得到的瞬时切削力值与用该模型计算的预测值进行了比较，两者吻合较好。
The elliptical vibration cutting (EVC) technique has been found to be a promising technique for ultraprecision machining of various materials. In each overlapping EVC cycle, the thickness of cut (TOC) of work material, and the tool velocity get continuously varied. These two inherent phenomena, in fact, introduce transient characteristics into its cutting mechanics, which are considered to be different from the one applied for conventional cutting technique. Recently, a few theoretical models have been developed to understand the material removal mechanism with the EVC technique; however, in those studies, the transient phenomena were not considered. In the present research, an analytical force model for the orthogonal EVC process was developed in order to fully understand the EVC mechanism, and to more accurately predict the transient cutting force values. Three important factors: (i) transient TOC, (ii) transient shear angle, and (iii) transition characteristic of friction reversal were investigated and analyzed mainly based on geometric modeling and the Lee and Shaffer's slip-line solution. Mathematical evaluation shows that they may have significant influence on EVC process, and thus on its output performance. In order to validate the proposed force model, a series of low-frequency orthogonal EVC tests were conducted. The experimental transient cutting force values were compared with the predicted values calculated using the proposed model, and they are found to be in a good agreement with each other.