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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/51445

Title: Wear behaviour of CVD diamond-coated tools in the drilling of woven CFRP composites
Authors: Chunliang Kuo
Chihying Wang
Shunkai Ko
Contributors: 國立臺灣海洋大學:商船學系
Keywords: Woven CFRP laminate
CVD diamond-coated tool
Tool wear
Fracture mode
Date: 2017-11
Issue Date: 2018-11-29T02:39:43Z
Publisher: Wear
Abstract: Abstract: The high specific strength/modulus of carbon fibre reinforced polymer composites (CFRPs) has led to their widespread use in the aerospace industry. Unfortunately, woven CFRP laminate can be exceedingly difficult to drill, resulting in rapid tool wear and fracturing. This work examines tools with novel geometric designs, such as double-point and multi-facet drills with diamond coatings. Experiments were conducted to characterize tool wear and fracture modes at two cutting speeds (50 and 75 m/min) and three feed rates (0.05, 0.1, 0.15 mm/rev) under dry conditions. This produced thrust forces of up to 128.28 N and torque values reaching 0.33 Nm, with a measuring temperature of ~135 °C. The double-point drill presented various tool wear patterns, including chipping and delamination of the diamond-coated layer. The tool wear patterns on the multi-facet drill included progressive abrasion wear, scoring and severe three body abrasion along the cutting lips on the first, second and the third facets respectively. The double-point drills presented fatigue ruptures, whereas the multi-facet drills showed chipping and micro-cracks under the chattering and excessive vibration during drilling. When the thermally induced static stress was imposed on the effects of the compressive residual stress, the observed Raman shift of the diamond structure can be the result.
Relation: 398-399 pp.1 - 12
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/51445
Appears in Collections:[商船學系] 期刊論文

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