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Fundamental study of exit burr formation mechanisms during orthogonal cutting of AlSi aluminium alloy
Journal of Materials Processing Technology ( IF 6.3 ) Pub Date : 2018-07-01 , DOI: 10.1016/j.jmatprotec.2018.02.037
Tristan Régnier , Guillaume Fromentin , Bertrand Marcon , José Outeiro , Alain D’Acunto , Arnaud Crolet , Timothée Grunder

Abstract Burr formation during machining is an important issue in industry. It causes an additional deburring operation, which is time consuming and has a negative economic impact. This study aims to analyse burr formation mechanisms and its accumulation in successive passes during orthogonal cutting of a cast aluminium alloy. A customized experimental setup was developed, which includes a high speed imaging system and a laser profilometer. A design of experiments using the setup mentioned previously is carried out and a methodology for geometric burr characterization is developed and applied. Furthermore, statistical representation of the obtained results is performed, which allows the understanding of the geometric heterogeneity influence associated to burr formation mechanisms and to work material microstructure. Based on the exit burr analysis, new geometrical criteria are proposed for the characterisation and the definition of two main burr formation mechanisms. The influence of cutting parameters on burr morphology along the workpiece exit edge is investigated in depth. The results show that two types of burrs can be produced simultaneously along the workpiece exit edge due to the work material microstructure heterogeneity. The results present as well the influence of low uncut chip thickness that leads to a higher proportion of burrs without chamfer. This type of burr is higher and more propice to burr accumulation. After performing several cutting passes, these burrs may be eliminated and replaced by a burr with chamfer.

中文翻译:

AlSi铝合金正交切削过程中出口毛刺形成机理的基础研究

摘要 机械加工过程中的毛刺形成是工业上的一个重要问题。它会导致额外的去毛刺操作,这是耗时的并且具有负面的经济影响。本研究旨在分析铸铝合金正交切削过程中毛刺的形成机制及其在连续走刀中的积累。开发了一个定制的实验装置,其中包括一个高速成像系统和一个激光轮廓仪。使用前面提到的设置进行实验设计,并开发和应用了几何毛刺表征方法。此外,对所获得的结果进行统计表示,这有助于了解与毛刺形成机制和工作材料微观结构相关的几何异质性影响。根据出口毛刺分析,为表征和定义两种主要毛刺形成机制提出了新的几何标准。深入研究了切削参数对工件出口边缘毛刺形态的影响。结果表明,由于工件材料显微组织的不均匀性,沿工件出口边缘可以同时产生两种类型的毛刺。结果还显示了低未切削切屑厚度的影响,这会导致更高比例的无倒角毛刺。这种毛刺较高,更容易堆积毛刺。在执行几次切削走刀后,这些毛刺可能会被消除并替换为带倒角的毛刺。深入研究了切削参数对工件出口边缘毛刺形态的影响。结果表明,由于工件材料显微组织的不均匀性,沿工件出口边缘可以同时产生两种类型的毛刺。结果还显示了低未切削切屑厚度的影响,这会导致更高比例的无倒角毛刺。这种毛刺较高,更容易堆积毛刺。在执行几次切削走刀后,这些毛刺可能会被消除并替换为带倒角的毛刺。深入研究了切削参数对工件出口边缘毛刺形态的影响。结果表明,由于工件材料显微组织的不均匀性,沿工件出口边缘可以同时产生两种类型的毛刺。结果还显示了低未切削切屑厚度的影响,这会导致更高比例的无倒角毛刺。这种毛刺较高,更容易堆积毛刺。在执行几次切削走刀后,这些毛刺可能会被消除并替换为带倒角的毛刺。结果还显示了低未切削切屑厚度的影响,这会导致更高比例的无倒角毛刺。这种毛刺较高,更容易堆积毛刺。在执行几次切削走刀后,这些毛刺可能会被消除并替换为带倒角的毛刺。结果还显示了低未切削切屑厚度的影响,这会导致更高比例的无倒角毛刺。这种毛刺较高,更容易堆积毛刺。在执行几次切削走刀后,这些毛刺可能会被消除并替换为带倒角的毛刺。
更新日期:2018-07-01
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