Small-hole drilling in engineering plastics sheet and its accuracy estimation

Endo, Hiroki; Marui, Etsuo

doi:10.1016/j.ijmachtools.2005.07.026

Cited by 26 publications

(21 citation statements)

References 5 publications

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“…The magnitude of A3 becomes large with the increase in spindle speed. This tendency is not clear in other coefficients, presumably for the following reasons: The feed rate per drill rotation is reduced with increase in the spindle speed, and the positioning in the initial stage of drilling is unstable, as mentioned in the previous report [12].…”

Section: Fourier Series Analysis Of Drilled Holesmentioning

confidence: 83%

“…By applying these values to the relations given in the previous report [12], the center of the least-square circle and its radius can be obtained. At this center of the leastsquare circle, the above-mentioned measurement is repeated, and the hole configuration in the polar coordinate system ðr i ; y i Þ is obtained.…”

Section: Article In Pressmentioning

confidence: 99%

“…We also drilled small holes 1 mm in diameter in engineering plastics sheet and estimated the drilled hole accuracy [12]. In this paper, the drilled hole accuracy was estimated as the maximum difference in hole configuration from the radius of the least-square circle, that is, the mean radius.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Accuracy estimation of drilled holes with small diameter and influence of drill parameter on the machining accuracy when drilling in mild steel sheet

Endo

Murahashi

Marui

2007

International Journal of Machine Tools and Manufacture

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Section: Fourier Series Analysis Of Drilled Holesmentioning

confidence: 83%

Section: Article In Pressmentioning

confidence: 99%

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Accuracy estimation of drilled holes with small diameter and influence of drill parameter on the machining accuracy when drilling in mild steel sheet

Endo

Murahashi

Marui

2007

International Journal of Machine Tools and Manufacture

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“…The correlations between drilling parameters and drill bit temperature were determined by multivariable linear regression analysis and the results can be seen in Table X and Table XI for unreinforced polyamide and carbon black reinforced polyamide, respectively. Besides, models can be seen in equation (2) and equation (3). The R 2 values were calculated as 97,92% and 97,56% for unreinforced and carbon black reinforced polyamides, respectively.…”

Section: Multivariable Linear Regression Analysismentioning

confidence: 99%

Investigating the Effects of Drilling Parameters on Drill Bit Temperature in Drilling of Carbon Black Reinforced Polyamide using Taguchi Method

2015

International Institute of Engineers (IIE) July 9-10, 2015 Singapore

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Polymers have been used in various industries and can be produced by forming in the mold but machining operations are usually performed due to needing in the assembly and fixing processes. In particular, drilling of engineering plastics such as polyamide, polyethylene etc. have been investigated by scientists. Additionally, electrically conductive polymers have been developed by adding conductive materials like carbon black, carbon nanotube, graphene etc. to the polymer matrix for electronic applications and automotive industry. For these reasons, this study aims to investigate the effects of drill point angle, feed, and cutting speed on the drill bit temperature by Taguchi and ANOVA (analysis of variance) statistic methods in the drilling of unreinforced polyamide and carbon black reinforced electrically conductive polyamide. In addition, the relation between the drill bit temperature and burr was examined. The optimum drilling condition for minimum drill bit temperature was determined at low cutting speed and drill point angle and high feed for given drilling parameters. It was specified that the drill bit temperature was higher in the drilling of carbon black reinforced polyamide than that measured in the drilling of unreinforced polyamide. The most significant parameter was obtained as the drill point angle by Taguchi method and ANOVA results confirmed this result. Additionally, it was observed that burr formation increased as increasing the drill bit temperature.

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“…On the other hand, there have been very few studies on the machining quality of engineering plastics. [21][22][23][24][25] Besides, the results obtained from the machining of polymer matrix composites may not be applied to the unreinforced polymers. Therefore, researches are still being carried out on the machining of engineering plastics.…”

Section: Introductionmentioning

confidence: 99%

Accuracy estimation in drilling small holes on engineering plastics by a mathematical approach

Uysal

Altan

2017

Proceedings of the Institution of Mechanical Engineers, Part C:

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Engineering plastics have wide applications in different fields of industry due to their light weight and easy shaping. In manufacturing multi-component products, assembly is an inevitable stage and drilling is one of the necessary processes before joining of the components of these products. In this study, two of the most common types of engineering plastics, polyacetal (POM) and cast polyamide (castamide), were drilled with twist drills of 0.5 mm and 1 mm diameters, under different cutting speeds and feeds. In determining the accuracy of the drilled small holes, a mathematical approach was used in which least square circle method was applied and radial error of the each drilled hole was obtained. Thus, the hole accuracy could be determined without measuring equipment such as coordinate measurement machine. It has been seen that POM gave better hole accuracy than cast polyamide due its thermal and tribological properties. The effects of feed and cutting speed on the radial error were also investigated. POM did not show apparent difference in radial error according to the cutting parameters while cast polyamide showed lower radial error in higher feeds with 0.5 mm of drill tool and lower radial error with 1 mm of drill tool. Additionally, the radial error could be reduced with decrease of spindle speed at higher feed.

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Small-hole drilling in engineering plastics sheet and its accuracy estimation

Cited by 26 publications

References 5 publications

Accuracy estimation of drilled holes with small diameter and influence of drill parameter on the machining accuracy when drilling in mild steel sheet

Accuracy estimation of drilled holes with small diameter and influence of drill parameter on the machining accuracy when drilling in mild steel sheet

Investigating the Effects of Drilling Parameters on Drill Bit Temperature in Drilling of Carbon Black Reinforced Polyamide using Taguchi Method

Accuracy estimation in drilling small holes on engineering plastics by a mathematical approach

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