Boundary conditions at the chip-tool interface in machining: Comparisons between seizure and sliding friction

Wright, Paul K.; Horne, J. G.; Tabor, D.

doi:10.1016/0043-1648(79)90128-5

Cited by 63 publications

(15 citation statements)

References 12 publications

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“…However, validation of these simulations on a global scale remains excessively limited, and is achieved by comparing the cutting forces [3], the shear angle, or the chip morphology [4][5][6]. Post mortem data of the cut (shear angle, chip thickness) are primarily obtained by interrupting the process with a Quick Stop Device [7,8]. This interruption is far from perfect; however, it is assumed that the tool removal has no influence on the obtained results.…”

Section: Introductionmentioning

confidence: 99%

Kinematic Field Measurements During Orthogonal Cutting Tests via DIC with Double-frame Camera and Pulsed Laser Lighting

et al. 2017

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The measurement of machined-part strain fields induced by the cutting process remains a challenge because of the presence of highly intensive and localised strains. In this study, a high-speed double-frame imaging device with pulsed laser lighting is used in order to obtain sharp and highly resolved images during orthogonal cutting tests performed in an aluminium alloy. The displacement fields are then measured using a global Q4-digital-image-correlation (DIC) method and several strategies, facilitating calculation of the total displacements due to the cut, along with the residual strains in the machined part. Numerical procedures are developed to manage the removed material that disturbs the DIC. An automatic primary shear angle detection procedure using DIC is also proposed. Five different markings, which are produced via chemical etching and micro blasting, are applied to the observed surfaces. Their effects on the kinematic fields and the uncertainties are then studied. Three surface parameters are proposed as indicators for determining the surface preparation suitability for the DIC. The repeatability of the kinematic fields induced during the cutting process is studied, because of the ease with which testing can be performed. Finally, the plastically deformed layer engendered by the cutting process is measured using the calculated residual strains.

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Section: Introductionmentioning

confidence: 99%

Kinematic Field Measurements During Orthogonal Cutting Tests via DIC with Double-frame Camera and Pulsed Laser Lighting

et al. 2017

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“…Oxygen has a significant influence on cutting mild steel and this is attributed to the reduction of gross adhesion of the chip at the rake face (Rowe and Smart 1963, 1964-1965, 1966-1967Rowe et al 1976). However, apparently anomalous effects have been noted when machining non-ferrous materials such as aluminium and copper, where oxygen seems to increase the cutting forces (Williams 1975;Wright et al 1979;Smart 1966-1967;Doyle et al 1979;Doyle and Horne 1980). This was explained by supposing that the tool would be subjected to the rubbing action of regions of oxide on the chip which might be sufficiently abrasive to remove the contaminant film on the tool resulting in high metallic contact (Williams and Stobbs 1979).…”

Section: Chapter 4 Utilisation Of Environmental Friendly Gaseous and mentioning

confidence: 95%

Utilisation of Environmental Friendly Gaseous and Vapour in Machining

Hsien

2014

SpringerBriefs in Molecular Science

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Air, oxygen and nitrogen are examples of environmental friendly lubricants in the gaseous state. Even at low pressures, they have strong influences on the cutting performance. However, as the cutting speed increases, the effectiveness of the gas lubricants attenuated. This has conventionally been attributed to the reduction in interface penetration and thus of intimate contact and adhesion between chip and tool. This chapter also provides a review of the advanced techniques supplying gaseous and vapours capable of prolonging tool life at high cutting speeds.

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“…In the light of earlier studies by one of the present authors and co-workers [2][3][4] and other published results [1], it is proposed to re-examine the friction characteristics at the interface in some detail. It is logical to suggest that there exists a relationship between the bond strength between the chip and tool and the shear stress at the interface.…”

Section: Introductionmentioning

confidence: 99%

“…The frictional boundary conditions in machining consist of sticking and sliding interfaces, which show variability in geometry over a period of time during cutting [1]. Cutting parameters and tool and workpiece material behaviours play an important role in this variation.…”

Section: Introductionmentioning

confidence: 99%

Analysis of fractal frictional contact in machining

Raman

Basu

Kilic

2007

Proceedings of the Institution of Mechanical Engineers, Part B:

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A model of the interfacial frictional conditions at the secondary shear zone in oblique cutting is under development. It has been suggested that the tool-chip interface consists of sticking and sliding microcontacts, each of which exhibit dynamic variations throughout the cut. The bond strength at the interface is difficult to determine because of the unpredictable characteristic of precipitation variability and the complex behaviour of the work material under severe cutting conditions. In this research the frictional interface is investigated on a microscopic scale to shed some light on these issues. Time-dependent cutting experiments illustrate the dynamic variations in sticking and sliding. It is also proved that the sticking and sliding areas exhibit fractal characteristics. Actual contact areas for sticking and sliding were calculated by using image analysis techniques. A relationship between the fractal dimension and the area of contact is noted. A mathematical model is proposed on the basis of the measured forces and calculated contact areas.

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Boundary conditions at the chip-tool interface in machining: Comparisons between seizure and sliding friction

Cited by 63 publications

References 12 publications

Kinematic Field Measurements During Orthogonal Cutting Tests via DIC with Double-frame Camera and Pulsed Laser Lighting

Kinematic Field Measurements During Orthogonal Cutting Tests via DIC with Double-frame Camera and Pulsed Laser Lighting

Utilisation of Environmental Friendly Gaseous and Vapour in Machining

Analysis of fractal frictional contact in machining

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