采用跌落式试验研究微尺度加工的过程力学

Syed Ahsan Adeeb , Yigit Karpat
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引用次数: 0

摘要

在倾入式试验中,当工件表面有网以恒定速度旋转时,刀具被赋予正弦运动。如果正确设置刀具的振幅和进给速度,以及工作材料的转速,则可以在全旋转内完成切入试验。因此,可以通过一次试验来详细研究微尺度加工的不同阶段,如摩擦、犁耕和剪切。结合力测量和切屑形貌,可以详细研究过程力学。本研究在商用纯钛合金的超精密数控机床上用金刚石刀具进行了深冲试验。使用解析模型分析了相同振幅下插入和拔出期间所观察到的切向力和法向力的差异。由于切屑厚度的增加,拔出阶段的合力大于插入阶段的合力。在分析模型的基础上,建立了一种俯冲式试验的计算模型。该方法可用于改进基于微尺度加工实验的材料本构模型参数的识别。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Using plunging-type testing to investigate process mechanics at micro scale machining
In plunging-type tests, a cutting tool is given a sinusoidal movement as the work material with a web on its surface is rotated at a constant speed. If the amplitude and feed rate of the cutting tool and rotational speed of the work material are correctly set, the plunging test can be completed within a full rotation. As a result, a detailed investigation of different episodes of micro-scale machining, such as rubbing, plowing, and shearing, can be conducted with a single test. Combined with force measurements and cut chip morphology, the process mechanics can be investigated in detail. This study conducted plunging tests on an ultra-precision CNC with a diamond cutting tool on commercially pure titanium alloy. The differences in tangential and normal forces observed during plunge-in and pull-out periods corresponding to the same amplitude were analyzed using an analytical model. Resultant forces during the pull-out phase are larger than those observed in the plunge-in phase, attributed to an increase in cut chip thickness. A computational model of the plunging-type experiment has also been developed based on the findings of the analytical model. The proposed hybrid approach may be useful to improve identification of material constitutive model parameters based on micro scale machining experiments.
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CiteScore
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