On the Machinability of Powder Metallurgy Austenitic Stainless Steels

Agapiou, John S.; Halldin, G. W.; DeVries, M. F.

doi:10.1115/1.3187892

Cited by 23 publications

(13 citation statements)

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“…Nevertheless a number of important investigations have been reported covering the effects of material density and 'free machining' additives as well as drill geometry and cutting conditions on the various technological machining performance measures (or machinability) of sintered materials [2,[4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. This is evident from the extremely low number of papers on machining presented at the many World Congresses on Power Metallurgy.…”

Section: Introductionmentioning

confidence: 99%

Modelling the Basic Cutting Action and Machining Performance of Sintered Metallic Materials

Armarego

Shi

Verezub

2001

Machining Science and Technology

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Extensive 'classical' orthogonal cutting tests have been run to study and model the basic cutting action and machining performance of a popular sintered metallic material widely used in structural automotive components. These tests were also run to assess whether the 'Unified-Generalised Mechanics of Cutting Approach' to force and power prediction in practical machining operations such as turning and drilling is likely to be applicable to sintered materials. The orthogonal cutting tests have shown that the modified mechanics of cutting analysis, incorporating the edge force, was equally applicable to sintered metallic materials while comprehensive drilling and turning tests over a wide range of operation variables have shown good qualitative and quantitative correlation between predicted and measured forces and torques thus confirming the validity of the predictive force models for machining sintered materials. This investigation has provided further evidence of the generic nature of the predictive machining performance modelling approach developed at the University of Melbourne and its applicability to both conventionally produced and sintered metallic materials for structural components.It has also been shown that the chip formation, cutting characteristics and mechanics of cutting analyses for the sintered metallic material for structural components, with its relatively high density and low porosity, are qualitatively similar to those for conventionally produced metallic materials. Quantitatively, however, the basic cutting quantities for use in the predictive force models are different and have to be established for each tool-workpiece material combination irrespective of whether the metallic material is a conventionally produced material or a sintered P/M material. 353

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Section: Introductionmentioning

confidence: 99%

Modelling the Basic Cutting Action and Machining Performance of Sintered Metallic Materials

Armarego

Shi

Verezub

2001

Machining Science and Technology

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“…It is important to define the shear level in the cutting zone. According [2] states, that the depth of the shear level follows the formula 0,05h ≤ h SP ≤ 0,1h, where h is the thickness of the cut section and h SP is the depth of the shear level. We observe elements from the cut layer in the shear layer that have been displayed (they melt the cutting edge).…”

Section: Experimental Procedures Analysis and Resultsmentioning

confidence: 99%

Elementary Study of the Machinability During Drilling of Stainless Steels X2Cr18Ni8

Jurko¹,

Mrkvica²,

Zaborowski³

2015

Mechanik

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Precise and reliable information on the machinability of a material before it enters the machining process is a necessity, and hypotheses must be tested through verification of actual methods. This article presents conclusions of machinability tests on austenitic stainless steels X2Cr18ni8and describes appropriate parameters for the cutting zone during the process of drilling. The article focuses on the analysis of selected domains through four basic some parameters of steel machinability.Keywords: drilling, cutting zone, plastic deformation, stainless steels, machinability, machined surface, Przed wdrożeniem nowych tworzyw konstrukcyjnych do procesu obróbki skrawaniem niezbędne są precyzyjne i niezawodne informacje o ich obrabialności, przy czym powinny być one sprawdzone aktualnymi metodami. W artykule przedstawiono wnioski z badania obrabialności austenitycznej stali nierdzewnej X2Cr18Ni8, opisano także właściwe parametry strefy skrawania w procesie wiercenia. W artykule skupiono się na analizie czterech podstawowych parametrów obrabialności stali w wybranych zakresach.Słowa kluczowe: wiercenie, strefa skrawania, odkształce-nie plastyczne, stal nierdzewna, obrabialność.

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“…By contrast, other studies tend to postulate that the contact area between the tool and workpiece is always the same, regardless of the presence or absence of the voids in the structure of the material [27]. Regardless of the underlying mechanics, as Agapiou and DeVries [28] pointed out, the average pore is typically sized between 1 and 10 µm (however, can be up to about 100 µm) and therefore would always be considerably smaller than the cutting edge whose length is typically in the millimetre domain. As a result, it is practically impossible to have the cutting edge fully engaged with only one pore at a time and perhaps this is the reason why the experimental confirmation of this theory is still lacking in macroscale machining [29].…”

Section: Interrupted Cutting Theorymentioning

confidence: 99%

Porosity and cutting forces: from macroscale to microscale machining correlations

Tutunea‐Fatan

Fakhri

Bordatchev

2011

Proceedings of the Institution of Mechanical Engineers, Part B:

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Porous metals, typically produced through powder metallurgy, represent a class of relatively new materials with wide industrial applications, lately extending into the microscale domain. Although produced in near-net shapes, most components fabricated from these materials still require some form of secondary machining. Despite the progress made in the field, relatively little is known either on the inherent cutting mechanism or on the behaviour of these materials under micromachining conditions. The present study reviews the main cutting theories proposed in macroscale machining, along with one of the primary parameters used to describe its machinability performances, namely cutting forces. Then, the feasibility of macroscale concepts is discussed in the context of micromachining technology that is characterized by comparable tool and pore sizes. The microslot cutting experiment performed in a porous titanium sample outlined the relative interplay between the magnitude of the cutting force and porosity of the material. Based on this, it was concluded that the impact of structural porosity on cutting forces experienced during micromachining is significant and therefore further in-depth investigations will be required.

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On the Machinability of Powder Metallurgy Austenitic Stainless Steels

Cited by 23 publications

References 0 publications

Modelling the Basic Cutting Action and Machining Performance of Sintered Metallic Materials

Modelling the Basic Cutting Action and Machining Performance of Sintered Metallic Materials

Elementary Study of the Machinability During Drilling of Stainless Steels X2Cr18Ni8

Porosity and cutting forces: from macroscale to microscale machining correlations

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