Publication: Investigation of hole roundness for sound absorber
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Date
2023-07-14
Authors
Khoo, Han Jian
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Abstract
This study investigates the roundness error of holes drilled in different conditions and their variables, which explores the relationship between this error and four key parameters: the sandwich method, material type, pause time after drill, and spindle speed. The objective is to understand the impact of these parameters on the diameter of the drilled holes and provide insights for optimizing the drilling process. A total of 27 samples were drilled using various combinations of the four parameters, and the diameter of the holes was measured using Scanning Electron Microscopy (SEM). Regression analysis and Analysis of Variance (ANOVA) were conducted to analyze the data and determine the significance of the parameters. The results revealed that material type had a significant and negative correlation with the roundness error. This indicates that the choice of material has a pronounced effect on the roundness and diameter of the drilled holes. The selection of the appropriate sound absorber material is critical in achieving the desired roundness and optimizing the performance of sound absorber panels. Conversely, the other parameters, including the sandwich method, pause time after drill, and spindle speed, showed weak correlations and limited statistical significance with the roundness error. The findings of this study emphasize the importance of material selection in minimizing roundness error in drilled holes. Different materials may exhibit variations in their structural properties, such as hardness or elasticity, which can influence the drilling process and ultimately impact the hole roundness. By carefully considering the material characteristics and their compatibility with the drilling parameters, manufacturers can optimize the drilling process and enhance the quality of sound absorber materials.