Influence of hole diameter, workpiece thickness, and tool surface condition on machinability of CFRP composites in orbital drilling: a case of workpiece rotation

Ahmad, Nauman; Khan, Sarmad Ali; Raza, Syed Farhan

doi:10.1007/s00170-019-03713-2

Cited by 18 publications

(9 citation statements)

References 13 publications

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“…Ahmad et al [18] the performance of coated tool was found to be better than its uncoated counterparts. However, despite coated WC-Co twist drills give good results and have a longer life cycle than uncoated twist drills, the latter are usually the most used in the CFRP material drilling process mainly due to their performance and good quality/price ratio.…”

Section: Introductionmentioning

confidence: 99%

“…This can occur because the fibers are alternatively subjected to torsional and compressive loads, which can cause shape defects in "cylindricity" and deviations from the nominal diameter. In this sense, some authors indicate that the most relevant defects occurring in CFRP dry drilling appears just at the drill bit input and output times; diameter deviation [17] can suffer errors of 0.23%, which may be considered unacceptable depending on the applications [18].…”

Section: Introductionmentioning

confidence: 99%

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Multiple Sensor Monitoring of CFRP Drilling to Define Cutting Parameters Sensitivity on Surface Roughness, Cylindricity and Diameter

2020

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Machining parameters affects the final quality of components made in carbon fiber reinforced plastic (CFRP) composite materials. In this framework, the work here presented aims at studying the right combination of cutting speed (vc) and feed rate (vf), for dry drilling of carbon fiber reinforced plastic composite materials, which obtained better results regarding roughness, hole cylindricity, and diameter. A series of experimental tests were carried out under different drilling conditions (vc/vf), monitoring the thrust force (Fz), torque (T), and electric power (EP), to define which one can help more for industrial daily life production. Results validation was carried out using the analysis of variance, in order to relate main machining parameters cutting speed and linear feed, with thrust force, drilling torque, main spindle electric power and hole quality parameters (average roughness, cylindricity and diameter). The conclusions show that thrust force is not proportional to the cutting speed and the best combinations of cutting speed and feed were found out around the average values of tested parameters. Spindle electric power is an interesting element to take into account because it is easy to consider in real production.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Multiple Sensor Monitoring of CFRP Drilling to Define Cutting Parameters Sensitivity on Surface Roughness, Cylindricity and Diameter

2020

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“…19–22 Recently, an efficient design technique that prevents this phenomenon from occurring has been reported along with design guidelines for the problem. 23…”

Section: Introductionmentioning

confidence: 99%

Measurement of five-degrees-of-freedom spindle error motion using multi probe error separation

Baek

Hwang

Cho

2021

Proceedings of the Institution of Mechanical Engineers, Part B:

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Herein, a precision measurement method is proposed to evaluate the radial, axial, and tilt error motions of rotating devices such as precision spindles. To improve the accuracy of the estimated multiple-degree-of-freedom error motion components, form error signals in the runout signals are separated and precompensated for before the calculation of the five-degrees-of-freedom error motion components. Fourier model-based multi probe error separation (MPES) techniques, which can prevent the occurrence of harmonic distortions, are applied to separate the form error signals. A three-probe method is applied to layers on the side surface of the cylindrical artifact, and a modified two-probe method is developed and applied to the upper surface. The radial, tilt, and axial error motions are calculated using the runout signals that do not contain the separated form error signals. The measurement system uses eight capacitive probes to detect the runout signals of the cylindrical artifact mounted at the center of the rotating device. To compare the proposed method with the five-probe-based conventional measuring method, an evaluation test simulation is conducted repeatedly five times. Results indicate that the proposed MPES method calculated the uncertainty using the deviation between the computed results from the existing and novel methods; additionally, the input signal in terms of the radial, tilt (layers 1 and 2), and axial error motions are [Formula: see text], [Formula: see text], [Formula: see text], and [Formula: see text], respectively. It is confirmed that the undesirable effects of the form error signals are successfully removed and that the accuracies of the measured spindle error motion components improve.

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“…The effect of speed on torque was ascribed to the negative effect of strain rate on the ability of the matrix to transfer the load to reinforcements. Ahmad, Khan, and Raza [ 21 ] used orbital drilling based on the workpiece rotation, which reported that tool wear, surface roughness, and diametric error were reduced due to less loading taking place on cutting tool. The performance of coated tools was found to be better than their uncoated counterparts on all output responses.…”

Section: Introductionmentioning

confidence: 99%

Investigating the Efficacy of Adhesive Tape for Drilling Carbon Fibre Reinforced Polymers

et al. 2021

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In the present research work, an effort has been made to explore the potential of using the adhesive tapes while drilling CFRPs. The input parameters, such as drill bit diameter, point angle, Scotch tape layers, spindle speed, and feed rate have been studied in response to thrust force, torque, circularity, diameter error, surface roughness, and delamination occurring during drilling. It has been found that the increase in point angle increased the delamination, while increase in Scotch tape layers reduced delamination. The surface roughness decreased with the increase in drill diameter and point angle, while it increased with the speed, feed rate, and tape layer. The best low roughness was obtained at 6 mm diameter, 130° point angle, 0.11 mm/rev feed rate, and 2250 rpm speed at three layers of Scotch tape. The circularity error initially increased with drill bit diameter and point angle, but then decreased sharply with further increase in the drill bit diameter. Further, the circularity error has non-linear behavior with the speed, feed rate, and tape layer. Low circularity error has been obtained at 4 mm diameter, 118° point angle, 0.1 mm/rev feed rate, and 2500 RPM speed at three layers of Scotch tape. The low diameter error has been obtained at 6 mm diameter, 130° point angle, 0.12 mm/rev feed rate, and 2500 rpm speed at three layer Scotch tape. From the optical micro-graphs of drilled holes, it has been found that the point angle is one of the most effective process parameters that significantly affects the delamination mechanism, followed by Scotch tape layers as compared to other parameters such as drill bit diameter, spindle speed, and feed rate.

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Influence of hole diameter, workpiece thickness, and tool surface condition on machinability of CFRP composites in orbital drilling: a case of workpiece rotation

Cited by 18 publications

References 13 publications

Multiple Sensor Monitoring of CFRP Drilling to Define Cutting Parameters Sensitivity on Surface Roughness, Cylindricity and Diameter

Multiple Sensor Monitoring of CFRP Drilling to Define Cutting Parameters Sensitivity on Surface Roughness, Cylindricity and Diameter

Measurement of five-degrees-of-freedom spindle error motion using multi probe error separation

Investigating the Efficacy of Adhesive Tape for Drilling Carbon Fibre Reinforced Polymers

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