Very high speed cutting of Ti–6Al–4V titanium alloy – change in morphology and mechanism of chip formation

Sutter, Guy; List, Gautier

doi:10.1016/j.ijmachtools.2012.11.004

Cited by 190 publications

(91 citation statements)

References 17 publications

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“…The dimensionless instability characteristic time decreases with increasing cutting speed for different CEFs, which means that the instability of shear deformation may take place much more easily at higher cutting speed. The trend is in accordance with the available experiments during free machining titanium alloys (Arrazola et al, 2009;Gente et al, 2001;Molinari et al, 2002;Sutter and List, 2013;Ye et al, 2013). If the cutting speed is a constant, the dimensionless instability characteristic time increases with CEF increasing in DLSEM.…”

Section: Instability Analysissupporting

confidence: 89%

“…However, the effect that the constraint suppresses the instability becomes much smaller at higher cutting speed. It is observed in the available experiments that the morphology of chip changes from continuous to serrate during cutting titanium alloys with increasing cutting speed (Arrazola et al, 2009;Gente et al, 2001;Molinari et al, 2002;Sutter and List, 2013;Ye et al, 2013). The critical speed that makes a distinction between continuous and serrated chip is an important parameter during free machining.…”

Section: Instability Analysismentioning

confidence: 99%

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Suppression of repeated adiabatic shear banding by dynamic large strain extrusion machining

Cai

Dai

2014

Journal of the Mechanics and Physics of Solids

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Section: Instability Analysissupporting

confidence: 89%

Section: Instability Analysismentioning

confidence: 99%

Suppression of repeated adiabatic shear banding by dynamic large strain extrusion machining

Cai

Dai

2014

Journal of the Mechanics and Physics of Solids

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“…For high-speed machining in Fig. 15a1, the shear stress fluctuates periodically which is the same as the trend of cutting forces in the available experimental measurements [46][47][48]. Moreover, more and more researchers have confirmed that the periodical oscillation is the result of shear band type localized deformation in high-speed machining [26,27,49].…”

Section: Effect Of Cutting Speed On Hopf Bifurcation In Fmsupporting

confidence: 52%

Suppression of Hopf bifurcation in metal cutting by extrusion machining

et al. 2016

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Hopf bifurcation is a common phenomenon during the metal cutting process, which results in poor surface finish of the workpiece and inhomogeneous grain structure in materials. Therefore, understanding and controlling Hopf bifurcation in metal cutting are necessary. In this work, the systematic low-speed extrusion machining experiments were conducted to suppress Hopf bifurcation phenomenon. It is found that the suppression of Hopf bifurcation is achieved with the increasing constraint extrusion degree. In order to reveal the mechanism of the suppression of Hopf bifurcation, a new nonlinear dynamic model for extrusion machining is developed where the convection, the diffusion, the extrusion of constraint, the thermal-softening deformation and the fracture-type damage are included. the present theoretical model is effective to characterize the suppression of Hopf bifurcation in metal cutting. Based on the numerical calculation of the theoretical model, the mechanisms underlying in extrusion machining are further revealed: Fracture-type deformation is more important than the thermal-softeningtype deformation in low-speed extrusion machining; however, the thermal-softening-type deformation is the primary deformation mode for high-speed extrusion machining.

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“…In segmented chips, a narrow zone of high deformation appeared between the segments, the so-called adiabatic shear-band. During the cutting process, deformation localizes in the primary shear zone and temperature increase significantly (Siemers et al, 2012 In the past, the chip-formation process of titanium alloys was intensively studied by means of cutting experiments (Sutter and List, 2013) and simulations (Calamaz et al, 2008).…”

mentioning

confidence: 99%

Analysis of a free machining α+β titanium alloy using conventional and ultrasonically assisted turning

Muhammad

Hussain

Maurotto

et al. 2014

Journal of Materials Processing Technology

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• This is the author's version of a work that was accepted for publication in the Journal of Materials Processing Technology. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication.A definitive version was subsequently pub- enhanced machinability generating short chips during metal cutting, which prevents entanglement with cutting tools improving productivity. To further enhance the machinability of this material, a novel hybrid machining technique called ultrasonically assisted turning (UAT) was used. Experimental investigations were carried out to study the machinability, chip shapes, cutting forces, temperature in the process zone and surface roughness for conventional and ultrasonically assisted turning of both alloys. UAT shows improved machinability with reduced nominal cutting forces, improved surface roughness of the machined workpiece and generation of shorter chips when compared to conventional machining conditions.

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Very high speed cutting of Ti–6Al–4V titanium alloy – change in morphology and mechanism of chip formation

Cited by 190 publications

References 17 publications

Suppression of repeated adiabatic shear banding by dynamic large strain extrusion machining

Suppression of repeated adiabatic shear banding by dynamic large strain extrusion machining

Suppression of Hopf bifurcation in metal cutting by extrusion machining

Analysis of a free machining α+β titanium alloy using conventional and ultrasonically assisted turning

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