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<p>The article presents the results of an experimental study of the drilling process using three different drilling concepts on the formation of burrs at the hole exit. Measurements of the height and width of the burrs at the hole exit were made using a Hirox KH-8700 microscope. Based on the measurement results, statistical analyses were performed to evaluate the effects of the drilling concept, spindle speed, and feed per revolution on the height and width of the burrs at the hole exit. Models were also built to predict the above parameters by means of linking a polynomial equation with a factorial (fractional) equation. The equation describing the burr width equation was simulated in the paper. Thus, the results are presented as 3D drawings showing the change of the above-described parameter with respect to technological parameters and the selected drilling concept. The smallest burrs (height and width) were obtained in experiment 17 (<i>n</i> = 3183, <i>f</i><sub><i>n</i></sub> = 0.12 and second drilling concept) and 18 (<i>n</i> = 3183, <i>f</i><sub><i>n</i></sub> = 0.12 and third drilling concept). The first drilling concept resulted in an average burr height that was 17% lower than the second concept and 12% lower than the third. At a spindle speed of 3183&#xa0;rpm, the average burr height was nearly the same as at 3979&#xa0;rpm but was 13% lower than at 4775&#xa0;rpm. Regarding feed per revolution, the burr height at <i>f</i><sub><i>n</i></sub> = 0.12&#xa0;mm/rev was 1% lower than at <i>f</i><sub><i>n</i></sub> = 0.1&#xa0;mm/rev and up to 19% lower than at <i>f</i><sub><i>n</i></sub> = 0.14&#xa0;mm/rev. For burr width, the third drilling concept performed best, reducing burr width by 24% compared to the first concept and 14% compared to the second. At a spindle speed of 3979&#xa0;rpm, the burr width was 4% lower than at 3183&#xa0;rpm and 10% lower than at 4775&#xa0;rpm. Regarding feed per revolution, the burr width at <i>f</i><sub><i>n</i></sub> = 0.12&#xa0;mm/rev was 2% lower than at <i>f</i><sub><i>n</i></sub> = 0.14&#xa0;mm/rev and 10% lower than at <i>f</i><sub><i>n</i></sub> = 0.1&#xa0;mm/rev. Finally, the conclusions highlight the practical applications of this research, providing insights into optimizing drilling parameters to minimize burr formation.</p>

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Innovative concepts of deep drilling technology in the context of cost optimization related to future operations

  • 期刊论文

  • 发表日期：

    2025年2月20日

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  • Mateusz Bronis

摘要

The article presents the results of an experimental study of the drilling process using three different drilling concepts on the formation of burrs at the hole exit. Measurements of the height and width of the burrs at the hole exit were made using a Hirox KH-8700 microscope. Based on the measurement results, statistical analyses were performed to evaluate the effects of the drilling concept, spindle speed, and feed per revolution on the height and width of the burrs at the hole exit. Models were also built to predict the above parameters by means of linking a polynomial equation with a factorial (fractional) equation. The equation describing the burr width equation was simulated in the paper. Thus, the results are presented as 3D drawings showing the change of the above-described parameter with respect to technological parameters and the selected drilling concept. The smallest burrs (height and width) were obtained in experiment 17 (n = 3183, fn = 0.12 and second drilling concept) and 18 (n = 3183, fn = 0.12 and third drilling concept). The first drilling concept resulted in an average burr height that was 17% lower than the second concept and 12% lower than the third. At a spindle speed of 3183 rpm, the average burr height was nearly the same as at 3979 rpm but was 13% lower than at 4775 rpm. Regarding feed per revolution, the burr height at fn = 0.12 mm/rev was 1% lower than at fn = 0.1 mm/rev and up to 19% lower than at fn = 0.14 mm/rev. For burr width, the third drilling concept performed best, reducing burr width by 24% compared to the first concept and 14% compared to the second. At a spindle speed of 3979 rpm, the burr width was 4% lower than at 3183 rpm and 10% lower than at 4775 rpm. Regarding feed per revolution, the burr width at fn = 0.12 mm/rev was 2% lower than at fn = 0.14 mm/rev and 10% lower than at fn = 0.1 mm/rev. Finally, the conclusions highlight the practical applications of this research, providing insights into optimizing drilling parameters to minimize burr formation.