Experimental study of coated tools effects in dry cutting of natural fiber reinforced plastics
Experimental study of coated tools effects in dry cutting of natural fiber reinforced plastics
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DOI：
10.1016/j.surfcoat.2015.06.083
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发表时间：
2015-12
影响因子：
5.4
通讯作者：
Faissal Chegdani;S. Mezghani;M. Mansori
中科院分区：
文献类型：
--
作者：
Faissal Chegdani;S. Mezghani;M. Mansori
本文旨在研究涂层刀具对天然纤维增强塑料(NFRPs)在异形铣削加工过程中表面光洁度的摩擦学效应，重点研究天然纤维的切割机理和刀具磨损。同时考虑了向上和向下两种铣削结构。用3种不同的刀具对单向亚麻纤维增强聚丙烯树脂(UDF/PP)进行了切割实验。分别采用未涂层碳化钨、涂层TiB_2和金刚石涂层进行了仿形铣削试验。通过测量比切割能来评价摩擦学切割接触。用扫描电子显微镜(SEM)和光学显微镜(OM)观察了样品的表面状态。使用2D SurFascan触针轮廓仪测量表面形貌。采用基于小波变换的标准和多尺度分析方法对NFRP加工表面光洁度进行了表征。结果表明，刀具涂层的刀具刃口半径对表面光洁度有显著影响。当去除的切屑厚度超过刀刃半径值时，天然纤维的剪切效率更高。此外，表面光洁度分析的合适尺度在50μm到1 mm之间，这与多尺度纤维增强结构相对应。此外，与未涂覆的刀具不同，TiB2和金刚石涂层允许刀具在亚麻复合加工的摩擦学要求下具有良好的耐磨性。
This work aims to investigate the tribological effects of coated tools on the surface finish of natural fiber reinforced plastics (NFRPs) during profile milling process with particular emphasis on the natural fiber cutting mechanisms and tool wear. Both up-milling and down-milling configurations were considered. The cutting experiments were carried out on unidirectional flax fibers reinforced polypropylene resin (UDF/PP) using three different cutting tools. Uncoated tungsten carbide, titanium diboride (TiB2) coated and diamond coated were used to conduct profile milling tests. Tribological cutting contacts were evaluated by measuring the specific cutting energy. Surface state was acquired by a scanning electronic microscope (SEM) and an optical microscope (OM). Surface topography was measured using a 2D Surfascan stylus profilometer. Machined NFRP surface finish was characterized using standard and multiscale analysis based on wavelets transform. Results show that the cutting edge radius made by tool coating has a significant effect on surface finish. Natural fiber shearing is more efficient once the removed chip thickness exceeds the cutting edge radius value. Moreover, it had been demonstrated that the pertinent scales for surface finish analysis are between 50 μm and 1 mm which correspond to the multiscale fiber reinforcement structure. Furthermore, and unlike the uncoated tool, TiB2 and diamond coatings allow a good wear resistance of the cutting tools against the tribological solicitations of flax composite machining.