Advanced Machining Processes

Grzesik, Wit

doi:10.1016/b978-0-444-63711-6.00015-6

Cited by 90 publications

(78 citation statements)

References 42 publications

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“…In empirical models, the most important variables are the feed rate, the tool corner radius, the depth of cut and the cutting speed in that order. The practical value of empirical models is substantially limited to the set of variable factors selected by manufacturers and, as a result, they used simple theoretical formulas for both Ra and Rz roughness parameters and compare them with measured values [2]. The main drawback of such approach was that all associated effects leading to the distortion of surface topography (for instance Brammertz's model represented by Eq.…”

Section: Introductionmentioning

confidence: 99%

“…Predominantly, scientific and engineering issues of hard turning do not address sufficiently surface topography and surface assessment is narrowed to the Ra or Rz roughness parameters [1,2]. In addition, the distortion of surface topography in finish hard machining has not been investigated satisfactorily.…”

Section: Introductionmentioning

confidence: 99%

“…Geometrical, physical, empirical and simulation models are the mostly used ones [2,9]. In empirical models, the most important variables are the feed rate, the tool corner radius, the depth of cut and the cutting speed in that order.…”

Section: Introductionmentioning

confidence: 99%

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Prediction of surface topography in precision hard machining based on modelling of the generation mechanisms resulting from a variable feed rate

Grzesik

2017

Int J Adv Manuf Technol

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The paper presents an original contribution to the prediction of surface topography produced by precision hard turning operations using CBN cutting tools and the variable feed rate of 0.025-0.075 mm/rev. The differences between theoretical and real surface roughness parameters Rz and Sz are quantified in terms of springback effect, additional smoothing of irregularities and side flow effect. The primary experimental study includes measurements of 2D and 3D surface roughness parameters using contact profilometer. Correspondingly, cutting forces were measured using a piezoelectric dynamometer, and based on this data, specific corresponding values of ploughing energy and friction coefficient were determined. It was found that the measured value of maximum height of the surface Sz differs from the theoretical value mainly due to elastic recovery of the machined surface and the smoothing effect at the lower feeds and the elastic recovery and the side flow effect at the higher feeds employed. An empirical model for the prediction of the Sz value in function of the feed rate is derived. The prediction accuracy can be improved by advanced numerical modelling of surface generation mechanisms and associated distortions.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Prediction of surface topography in precision hard machining based on modelling of the generation mechanisms resulting from a variable feed rate

Grzesik

2017

Int J Adv Manuf Technol

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“…Generally, tool-wear/failure depends not just on the workpiece material but also on tool material, its geometry, cutting parameters (cutting velocity, feed rate and depth of cut), cooling/lubrication condition, machine tool characteristics, etc. [2].…”

Section: Introductionmentioning

confidence: 99%

In-Line Spatial Monitoring of Cutting Tool-Wear

ÄŒerÄe

Kramar

Kopač

2017

IJAQ

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“…In practice, more advanced constitutive material models which also consider strain hardening, thermal softening and microstructure changes as functions of three factors including strain, strain rate and temperature are applied. As a result, a number of different constitutive models which take into consideration these variable factors are used by FEM users (Ref [1][2][3][4]. In this investigation, a classical Johnson-Cook model defined by Eq 1 is used.…”

Section: Introductionmentioning

confidence: 99%

Determination of Material Constitutive Laws for Inconel 718 Superalloy Under Different Strain Rates and Working Temperatures

Grzesik

Niesłony

Laskowski

2017

J. of Materi Eng and Perform

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In this paper, a special procedure for the prediction of parameters of the Johnson-Cook constitutive material models is proposed based on the experimental data and specially developed MATLAB scripts which allow advanced modeling of complex 3D response surfaces. Experimental investigations concern two various strain rates of 10 23 and 10 1 1/s and the testing temperature ranging from the ambient up to 700°C. As a result, a set of mathematical equations which fit the experimental data is determined. The applicability of the experimentally derived constitutive models to the FEM modeling of real machining processes of Inconel 718 alloy is verified.

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Advanced Machining Processes

Cited by 90 publications

References 42 publications

Prediction of surface topography in precision hard machining based on modelling of the generation mechanisms resulting from a variable feed rate

Prediction of surface topography in precision hard machining based on modelling of the generation mechanisms resulting from a variable feed rate

In-Line Spatial Monitoring of Cutting Tool-Wear

Determination of Material Constitutive Laws for Inconel 718 Superalloy Under Different Strain Rates and Working Temperatures

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