Dynamics of the twist drilling process

Webb, Philip

doi:10.1080/00207549308956759

Cited by 6 publications

(4 citation statements)

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“…where is a compliance term in the sliding mode, is the applied load and is the half delamination size in the longitudinal direction. Based on the assumptions (17)(18), the solution of the shear part of the transverse displacement for the elliptic crack configuration ( Fig. 4) is proposed here as:…”

Section: Model Formulation For General Laminates Under Distributed Lomentioning

confidence: 99%

“…The geometric parts of drill include the point angle, chisel edge/angle, cutting lip [10][11][12][13], helix angle, diameter, and web [7]. These parts significantly influence drilling parameters and responses (thrust force, torque, cutting speed, feed rate, cutting force, material removal rate (MRR) and depth of cut), and also the quality of the drilled parts [14][15][16][17][18]. The feed rate plays a crucial role in determining the quality of drilled holes of FRP composite laminates as it determines the magnitude of the thrust force during drilling operation; thrust force mainly depends on feed rate and chisel edge [19,62].…”

Section: Introductionmentioning

confidence: 99%

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A new analytical critical thrust force model for delamination analysis of laminated composites during drilling operation

Ojo

Ismail

Paggi

et al. 2017

Composites Part B: Engineering

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Section: Model Formulation For General Laminates Under Distributed Lomentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A new analytical critical thrust force model for delamination analysis of laminated composites during drilling operation

Ojo

Ismail

Paggi

et al. 2017

Composites Part B: Engineering

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“…The resultant effects of these parts are directly on the drilling variables or parameters. These parameters include, but are not limited to, drilling forces such as thrust force and torque [17], cutting force [18], cutting speed, feed rate [10], material removal rate (MRR) and depth of cut [19][20][21]. Among these variables, feed rate plays a crucial role in determining the quality of drilled holes of FRP composite laminates.…”

Section: Introductionmentioning

confidence: 99%

Thermo-mechanical modelling of FRP cross-ply composite laminates drilling: Delamination damage analysis

Ismail

Ojo

Dhakal

2017

Composites Part B: Engineering

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Among other factors, thrust force, feed rate, twist drill bit chisel edge and point angle are the principal factors responsible for delamination drilling-induced damage during thermomechanical deformation. Hence, in this paper, an analytical thermo-mechanical model is proposed to predict critical feed rate and critical thrust force at the onset of delamination crack on CFRP composite cross-ply laminates, using the principle of linear elastic fracture mechanics (LEFM), laminated classical plate theory, cutting mechanics and energy conservation theory. The delamination zone (crack opening Mode I) is modelled as an elliptical plate. The advantages of this proposed model over the existing models in literature are that the influence of drill geometry (chisel edge and point angle) on push-out delamination are incorporated, and mixed loads condition are considered. The forces on chisel edges and cutting lips are modelled as a concentrated (point) and uniformly distributed loads, resulting into a better prediction. The model is validated with models in the literature and the results obtained show the flexibility of the proposed model to imitate the results of existing models.

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“…Both the geometrical shape and dimensions of a twist drill determine the cutting performance and influence the cutting forces, tool wear, cutting dynamics and the quality and integrity of drilled holes. 9–12 These make the design of twist drill of critical importance. A poorly designed cutting edge results in an undesired distribution of the cutting angles along the drill cutting edge, 13–16 causing inefficient performance, loss of cutting ability and increase in total manufacturing cost.…”

Section: Introductionmentioning

confidence: 99%

Recent advances in twist drill design for composite machining: A critical review

Ismail

Dhakal

Dimla

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part B:

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In the field of composite technology, inefficient and poor designs of twist drills contribute immensely to the challenges facing drilling of composite materials. An attempt to report some of the drill design methods and their inherent challenges confronting composite machining necessitates the writing of this article. A critical review has been conducted to offer a clear understanding of the current advances in the field of mechanical drilling of composite materials, focusing on geometry, material and parametric tool designs. The inter-dependable effects of thrust force, cutting speed, feed rate, cutting force and torque on drill design are similarly reviewed. This article also reveals other associated issues facing composite drilling including delamination, surface roughness, rapid tool wear and drill breakage. Well-designed drill geometry and good knowledge of drilling parameters afford the producers of polycrystalline diamond, carbide and highspeed steel tooling materials better opportunity of developing a drill that will minimise delamination of the reinforced composites and tool wear and produce a high-quality surface. Twist drill manufacturers and users will benefit from this article as they seek to have well-designed and improved drills.

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Dynamics of the twist drilling process

Cited by 6 publications

References 0 publications

A new analytical critical thrust force model for delamination analysis of laminated composites during drilling operation

A new analytical critical thrust force model for delamination analysis of laminated composites during drilling operation

Thermo-mechanical modelling of FRP cross-ply composite laminates drilling: Delamination damage analysis

Recent advances in twist drill design for composite machining: A critical review

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