https://orcid.org/0000-0002-1574-8607
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ABSTRACT
This paper aims to investigate the effects of machining parameters such as spindle speed, feed rate and drill diameter on machinability of flax/poly(lactic acid) bio-composites, to analyze the relations among cutting forces, drilling-induced damages and crack propagation of the drilled samples. In particular, a set of drilling experiments were conducted using different drilling conditions and a new low-cost measurement set-up was developed to measure the cutting force during the drilling operation. In addition, the analysis of variance (ANOVA) was applied to identify the significance of each individual cutting parameter. The experimental results indicate the relation between the thrust force and the machinability parameters of flax fiber reinforced bio-composite. The increase in spindle speed reduces thrust force and delamination size of the drilled holes, whereas an increase in feed and drill diameter leads to a considerable increase in both thrust force and delamination factor. The effect of spindle speed on peripheral damage was not significant for the drills tested, though the feed rate was found to play the key role on the delamination damage area. The best hole quality was achieved with the samples drilled at spindle speed and feed rate of 3000 rpm and 0.11 mm/rev, respectively.
摘要
研究了主轴转速、进给速度、钻头直径等加工参数对亚麻/聚乳酸生物复合材料可加工性的影响，分析了切削力、钻削损伤和裂纹扩展之间的关系.特别地，利用不同的钻削条件进行了一组钻削实验，并且开发了新的低成本测量装置来测量钻削操作期间的切削力.此外，应用方差分析（ANOVA）来识别各切削参数的显著性.试验结果表明了亚麻纤维增强生物复合材料的推力与切削性能参数之间的关系.主轴转速的增加降低了所钻孔的推力和分层尺寸，而进给量和钻头直径的增加导致推力和分层系数的显著增加.主轴转速对钻头周边损伤的影响不显著，但进给速度对分层损伤面积起关键作用.采用主轴转速 3000rpm、进给速度0.11mm/rev的钻削试样，可获得最佳的孔质量.
Acknowledgment
The authors would like to thank the support of the Griffith University International Postgraduate Research Scholarship (GUIPRS and GUPRS).