Thermoviscoplastic modelling of drilling: Twist drills

Nayebi, A.; Vaghefpour, Hossein

doi:10.1243/09544054jem855

Cited by 2 publications

(3 citation statements)

References 21 publications

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“…The total torque and thrust force expressed in equations (27) and (28) were then calculated, and the predictive results were found to correspond to the experimental measures with the average error of 8.4%. This is similar to the prediction error reported in the modeling works of Nayebi and Vaghefpour 13 (∼6%) and Naisson et al 14 (∼10%).…”

Section: Resultssupporting

confidence: 90%

“…According to the review of literature noted above, the investigations of coating materials are mostly done through some characterization techniques to reveal the mechanical and wear behavior of coating materials while their effects on machining performance have rarely been analyzed with regard to the machining mechanics. By considering the drilling process, the effect of friction coefficient on drilling mechanics caused by different coating materials has not clearly been revealed, although a number of research works interestingly propose the empirical 12 and analytical 13–15 models for prediction of cutting loads. Therefore, a comprehensive study of coating and its characteristics associated with the drilling mechanics is necessary to provide a better insight into the process.…”

Section: Introductionmentioning

confidence: 99%

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Surface characteristics and machining performance of TiAlN-, TiN- and AlCrN-coated tungsten carbide drills

Dumkum

Jaritngam

Tangwarodomnukun

2018

Proceedings of the Institution of Mechanical Engineers, Part B:

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This article presents a comprehensive analysis of surface characteristics and drilling performance of uncoated and coated tungsten carbide drills. The single- and double-layer coatings of TiN, TiAlN and AlCrN were examined in terms of surface roughness, microhardness and crack resistance. In addition, drilling torque and thrust force were experimentally measured and compared to the developed models based on the drilling mechanics and drill geometries. Tool wear and hole surface roughness were also considered to assess the machining performance of different coated tools. The results revealed that all coated drills can offer better cut surface quality, 28% lower cutting loads and longer tool life than the uncoated drills. Although AlCrN was found to be the hardest coating material among the others, it caused large wear on the cutting edges and poor surface roughness of produced holes. The lowest torque and thrust force were achievable using TiN-coated drill, while the use of TiAlN coating resulted in the lowest surface roughness and smallest tool wear. Furthermore, the drilling torque and thrust force model developed in this study were found to correspond to the experimental measures with the average error of 8.4%. The findings of this work could facilitate the selection of coating materials to advance the machining performance.

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Section: Resultssupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Surface characteristics and machining performance of TiAlN-, TiN- and AlCrN-coated tungsten carbide drills

Dumkum

Jaritngam

Tangwarodomnukun

2018

Proceedings of the Institution of Mechanical Engineers, Part B:

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“…The rake angle ( γ ) is the representative angle used to describe the orientation of the rake face. The rake angle on the chisel edge is shown in equation (1) 36…”

Section: Model Derivationmentioning

confidence: 99%

Modelling of thrust force for worn drill bits characterised by cutting edge radius in drilling carbon fibre–reinforced plastic/Ti-6Al-4V alloy stacks

Luo

Zhang

Yuan

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part B:

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Wear rates are rapid when drilling carbon fibre–reinforced plastics/Ti-6Al-4V alloy stacks because of their distinct mechanical properties. Tool wear leads to a high thrust force, thereby reducing the quality of the drilled holes. This article develops a novel mechanistic model for carbon fibre–reinforced plastics/Ti-6Al-4V stacks, which is characterised by the cutting edge radius, to predict the variation of the thrust force when drilling with worn drill bits. Drilling experiments with varying feed rates were performed using carbide twist drill bits. The thrust force and drill edge profile were measured to calibrate and validate the presented model. The edge radius increases with both the cutting distance and number of drilled holes at varying feed rates. It was found that the growth rate of the edge radius increased with the feed rate with identical cutting distances, whereas it decreased slightly with the feed rate when the number of drilled holes was identical. Tool wear reduces the equivalent rake angle of the drill edge, resulting in higher thrust force. The maximum thrust force increases almost linearly with the edge radius of worn drills for both materials. The predicted thrust force curves are in very good agreement with the measured curves during the entire process. Average absolute errors of the maximum thrust force for carbon fibre–reinforced plastics and Ti-6Al-4V alloy are 3.24% and 1.88%, respectively.

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Thermoviscoplastic modelling of drilling: Twist drills

Cited by 2 publications

References 21 publications

Surface characteristics and machining performance of TiAlN-, TiN- and AlCrN-coated tungsten carbide drills

Surface characteristics and machining performance of TiAlN-, TiN- and AlCrN-coated tungsten carbide drills

Modelling of thrust force for worn drill bits characterised by cutting edge radius in drilling carbon fibre–reinforced plastic/Ti-6Al-4V alloy stacks

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