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Ezugwu, E. O.; Olajire, K.A.

doi:10.1023/a:1014711308163

Cited by 18 publications

(5 citation statements)

References 2 publications

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“…Hard abrasive foreign particles in the work material can play a significant role in the wear of tools in which under conditions of sliding, these particles make a greater contribution to abrasive wear than under seizure conditions. During machining of HH-S, the rate of the coating being removed from the rake face at some distance from the tool edge was higher than that in machining LH-S (see figures [5][6][7]. This result indicates that the hardness of the work material has significant influence on the abrasive wear at this region.…”

Section: Morphology Of the Tool Surfacementioning

confidence: 91%

“…To achieve a high accuracy of profile on the stainless steel insert, tool wear must be kept to a minimum by using the appropriate tool type and machining parameters. Many researchers have investigated the wear of uncoated and coated carbide tools during turning of stainless steel on conventional lathes at cutting speeds, depths of cut and feed rates of above 50 m/min, 1000 lm and 150 lm/rev, respectively [5][6][7][8][9]. It was found that the cutting temperature could reach up to 1500°C.…”

Section: Introductionmentioning

confidence: 99%

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Performance of Uncoated and Coated Carbide Tools in the Ultra-Precision Machining of Stainless Steel

Liew

Ding

et al. 2004

Tribology Letters

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Ultra-precision machines are widely used to turn aspherical or spherical profiles on mould inserts for the injection moulding of optical lenses. During the turning of a profile on a stainless steel mould insert, the cutting speed reduces significantly to 0 as the cutting tool is fed towards the centre of the machined profile. This paper reports experiments carried out to study the wear of uncoated and PVD-coated carbide tools (carbide tool coated with 2000 alternate layers of AlN and TiN, each layer 1.5 nm and carbide tool coated with 0.5 lm TiN, 5.5 lm TiCN and 0.5 lm TiN) in the ultra-precision machining of STAVAX (modified AISI 420 stainless steel) at low speeds with and without lubricant. A sprayed mixture of compressed air, liquid paraffin oil and cyclomethicone was used as lubricant. Examination of the wear at the rake face of the tool suggests that during machining of the alloy with a hardness of 55 HRC without lubricant, the cutting edge is subjected to high compressive stress, resulting in fracture. Reducing the hardness of the alloy would therefore result in a lower stress acting on the cutting edge, thus rendering the tool less susceptible to fracture. Both the rake and the flank faces of the coated tools exhibited lower wear than the uncoated tools. This was due to the former tools possessing higher fracture resistance owing to the presence of the coating. The lubricant was effective in improving surface finish, preventing surface fracture and reducing flank wear.

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Section: Morphology Of the Tool Surfacementioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Performance of Uncoated and Coated Carbide Tools in the Ultra-Precision Machining of Stainless Steel

Liew

Ding

et al. 2004

Tribology Letters

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“…Chryssolouris [6] reported that wear pattern of CBN cutting tool is dependent on the percentage of martensite in the work material, the type, the size and composition of the hard phase after testing four different work materials with same hardness of 55 HRC. Plastic deformation and formation of over tempered martensitic were dominant subsurface defects when machining under both dry and wet conditions while machining martensitic stainless steel (JETHETE) [7]. Liew et al [8] conducted study on cutting AISI 420 stainless steel by using PCBN tool.…”

Section: Introductionmentioning

confidence: 99%

Performance of CBN and PCBN Tools on the Machining of Hard AISI 440C Martensitic Stainless Steel

Thamizhmanii

Ahmad

Hasan

2011

AMR

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the cutting forces and also causes the heat generated at tool tip and work surface interface. High cutting forces are identified and this may be due to heat and flank wear combinations. Flank and crater wear on the rake face and hard metal deposition due to diffusion of metals on the cuttiug tool surface are the damages occurred during process. mRODUCTIONHard turning has been applied in Inany areas like production of bearings, gears, shafts, axles, and other mechanical components [l-21. ATSI 440 C martensitic stainless steel is pronounced as difticult to cut materials and t l~i s~a r d e n e d %~~r i k e~-d~s * R r m i~ of these types of materials require hard and tough cutting tools like CBN and PCBN tools. These types of cutting tools will reduce flank wear and withstand the heat generation. The generatlon of heat will produce low cutting forces due to thermal softening of the chips. It is known that 60 % of the heat generated by the turning is c a~i e d away by chips and the remaining is retained by work material and tool cutting edges. However, stainless steels are low thermal conductivity material and very small percentages of heat retained by the work material. Tool wears are complex phenon~enon.Tool wear is common in all the machining processes and depend very much on the hardness of the work materials, type of tool, rigidity of the machine, hardness of the work materials heat All rights reserved. No pan of contents or this paper may be reproduced or tnnsmined in any brm or by any means wimoufthe wrnten permissionof TTP.

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“…Experimental investigations on superficial strain hardening induced by machining are in general carried out by performing hardness analysis [7,8]; due to high gradients of hardness close to the surface, microhardness tests were often preferred. Both Vickers and Knoop indenters were used for this purpose [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…A particular interest should be devoted to the pattern of microhardness results as a function of the distance from the surface. Some authors [10,11] reported a monotonic behavior, while others [9,12] found different hardness plots. Some non monotonic trends may be related to structural changes within the machined material (white layer [13]), able to affect both microhardness and residual stress distribution.…”

Section: Introductionmentioning

confidence: 99%

Analytical and Numerical Modeling of Strain Hardening in AISI 304 Steel Cutting

D’Urso

Attanasio

2011

AMR

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The present paper reports the results obtained investigating surface work hardening in turning as a function of cutting speed, feed rate and tool wear. An experimental campaign was carried out using AISI 304 steel as workpiece material. Pipes 4 mm thick were machined under orthogonal cutting conditions. Tools with flat rake surface were adopted and dry cutting conditions were taken into account. Cutting speed and feed rate were varied and the tool wear was monitored using a CNC visiomeasuring machine. The tool wear was related to the workpiece strain hardening. Starting from micro Vickers test data, an analytical model representing the strain hardening behavior along a workpiece section was defined. In addition, a Fortran subroutine for the simulation of strain hardening by means of a 2D FEM code was implemented.

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Untitled

Cited by 18 publications

References 2 publications

Performance of Uncoated and Coated Carbide Tools in the Ultra-Precision Machining of Stainless Steel

Performance of Uncoated and Coated Carbide Tools in the Ultra-Precision Machining of Stainless Steel

Performance of CBN and PCBN Tools on the Machining of Hard AISI 440C Martensitic Stainless Steel

Analytical and Numerical Modeling of Strain Hardening in AISI 304 Steel Cutting

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