Investigation of tool wear and multi-objective optimization in drilling of woven CFRP composite

Autor: Chih-Ying Wang, 汪志穎
Rok vydání: 2017
Druh dokumentu: 學位論文 ; thesis
Popis: 105
This work examines cutting force, tool wear and hole quality with novel geometric designs, such as double-point and multi-facet drills with diamond coatings. Experiments were conducted with the variable of cutting speeds (50-180 m/min) and feed rates (0.05- 0.15 mm/rev) under dry conditions and use ANOVA to examine the signification of variables. To achieve the multi-objective optimization, we used Decision maker’s equation to build up the multi-objective optimization model. And use superposition process map to require the optimal range of parameters. The double-point drill presented various tool wear patterns, including chipping, delamination and fracture on the cutting lips. The tool wear patterns on the multi-facet drill included progressive abrasion wear, scoring and chipping along the cutting lips on the first, second and the third facets respectively. From the multi-objective optimization results under equal weighting of each objective, it suggested that the best combination for multi-facet drill is under the cutting speed of 50 m/min coupling with the feed rate of 0.05 mm/rev. In contrast, double-point drill was suggested to be used under the cutting speed of 110 m/min coupling with the feed rate of 0.05 mm/rev. When the threshold was set to be 25% of the range form experimental results, the superposition process map shows the preferable parameters of multi-facet drill are in the cutting speed of 50-55.46 m/min and the feed rate of 0.052-0.082 mm/rev. Double-point drill’s preferable parameters for out of roundness are distributed in the cutting speed of 110-137.37 m/min and the feed rate of 0.05-0.069 mm/rev. For first flank wear are distributed in the cutting speed of 158-180 m/min and the feed rate of 0.05-0.062 mm/rev.
Databáze: Networked Digital Library of Theses & Dissertations
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