Machinability of BN free-machining steel in turning

Tanaka, Ryutaro; Yamane, Yasuo; Koike, Sekiya; Narutaki, Norihiko; Shiraga, Tetsuo

doi:10.1016/j.ijmachtools.2007.02.003

Cited by 40 publications

(21 citation statements)

References 6 publications

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“…In recent years, the possibility of adding BN to improve the machinability of steel was explored (Tanaka et al, 2007;Tanaka et al, 2009). The influences of steel composition and tool material on the machinability have been investigated and confirmed that BN inclusions could improve the machinability of steel significantly.…”

Section: Introductionmentioning

confidence: 94%

Basic research on mechanism of BN inclusion in improving the machinability of steel

Chen¹,

Bao²,

Wang³

et al. 2014

REVMETAL

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Boron nitride-added eco-friendly free cutting steel has recently drawn more and more attention. But, the mechanisms explaining the role of BN inclusions improving the machinability of steels is not very clear. In this investigation, the material removal mechanism for cutting of BN inclusions in steels is explored, using a combination of theoretical analysis and a series of experiments. First, the actual shape of BN inclusions is observed and the amount and distribution of BN inclusions is quantitatively analyzed. Subsequently, the cutting performance of the steel is determined by cutting experimental tests. Moreover, the micro mechanical properties and the material removal mechanisms for cutting of BN inclusions are investigated by means of nanoindentation. The results revealed that the BN inclusions are hexagonal and are uniformly distributed, their average content is 23.2 per unit area and their volume fraction is 0.51% in the steel with 74 ppm B and 180 ppm N. It is shown that BN inclusions can improve the cutting performance of steel significantly, and a model describing the material removal mechanism for cutting of BN inclusions is proposed. BN inclusions act as stress concentration source, lubrication and wrappage of hard particles. RESUMEN:Investigación básica sobre los mecanismos que explican el papel de las inclusiones de BN en la mejora de la maquinabilidad de aceros. Los aceros de fácil mecanizado o corte libre con nitruro de boro agregado han despertado un gran interés. Sin embargo, aún no se han determinado los mecanismos que explican el papel de las inclusiones de BN en la mejora de la maquinabilidad de estos aceros. En este trabajo, se investigan los mecanismos de corte de las inclusiones BN en aceros mediante la combinación de un análisis teórico y una serie de experimentos. En primer lugar, se determina la morfología de las inclusiones BN y se analiza cuantitativamente la cantidad y distribución de las mismas. Posteriormente, el rendimiento de corte del acero se determina mediante ensayos de corte. Por otra parte, las propiedades mecánicas locales y los mecanismos de eliminación de material para el corte de inclusiones BN son investigados por medio de nanoindentación. Los resultados revelaron que las inclusiones son BN con forma hexagonal y se distribuyen de manera uniforme, su contenido promedio es de 23,2 por unidad de superficie y su fracción de volumen es 0,51% en el acero con un contenido de 74 ppm de B y 180 ppm N. Se demuestra que las inclusiones BN pueden mejorar el rendimiento de corte del acero de manera significativa, y se presenta un modelo que describe el mecanismo de corte de las inclusiones de BN. Finalmente, se comprueba que los BN actúan como fuente de concentración de tensiones, la lubricante y de conglomerante de partículas duras.

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Section: Introductionmentioning

confidence: 94%

Basic research on mechanism of BN inclusion in improving the machinability of steel

Chen¹,

Bao²,

Wang³

et al. 2014

REVMETAL

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“…En ese mismo año, Tanaka et al, evaluaron las fuerzas de corte axial, radial y tangencial, el desgaste del flanco, el desgaste máximo del cráter, y la temperatura para varios carburos y cermet sin recubrimiento durante la elaboración en seco de varios aceros de maquinabilidad mejorada (incluyendo el acero AISI 1045 como referencia), utilizando hasta 500 m/min de velocidad de corte [19] . Estos autores no llegaron a las altas velocidades de corte, ni utilizaron carburos recubiertos en su artículo.…”

Section: Figuraunclassified

Estudio del rendimiento del torneado de alta velocidad utilizando el coeficiente de dimensión volumétrica de la fuerza de corte resultante

et al. 2013

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This work deals with the experimental study of the resultant cutting force evolution of two coating carbide and a cermet inserts, during the dry turning of AISI 1045 steel with 400, 500 and 600 m/min cutting speeds. A new criterion for machinability study, the coefficient of volumetric dimension of cutting force, it is introduced. The investigation showed a better performance of cermet for moderate and intermediate cutting speeds, while at high cutting speed and final machining time, the three layers coated carbide achieved the best result. The factorial analysis of variance demonstrated a significant effect of machining time on the coefficient of volumetric dimension of resultant cutting force, while the material insert factor and their interaction, for intermediate cutting speed was just significant.

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“…In practice, these ceramic tools are not used in machining structural carbon steels because a satisfactory cutting performance is not obtained when turning mild steel (1) . However, the alumina TiC-based ceramic tool was found to show a remarkably better cutting performance than a pure alumina ceramic tool or coated carbide tool when turning BN free-machining steel based on AISI 1045 (2) . At a cutting speed of 250 m/min, cut depth of 0.3 mm, and feed rate of 0.15 mm/rev, the tool life of ceramic tools when turning standard steel is less than 15 min; this is much shorter than that of a coated carbide tool, which has a tool life of almost 140 min when the tool life criterion is set to VB = 0.2 mm.…”

Section: Introductionmentioning

confidence: 95%

Wear Characteristics of Ceramic Tools When Turning BN Free-Machining Steel

Tanaka

Hosokawa

Furumoto

et al. 2013

JAMDSM

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This study examined the wear characteristics of ceramic tools when turning BN free-machining steel based on AISI 1045. An experiment was conducted to investigate why the alumina TiC-based ceramic tool showed remarkably better cutting performance than a pure alumina ceramic tool. The tool flank temperature, cutting force, and element distribution on the wear part were investigated. The cutting force and tool flank temperature of the BN free-machining steel were lower than those of standard steel, and the alumina TiC-based ceramic tool allowed for a lower cutting force and tool flank temperature than the pure alumina ceramic tool. After cutting of the BN free-machining steel, on the rake face, a deposited layer containing Al and N was detected, and the amount of the deposited layer on the alumina TiC-based ceramic tool was more than that on the pure alumina ceramic tool. Therefore, using an alumina TiC-based ceramic tool suppresses the tool flank temperature and makes it easier for a protective nitride layer to stick on the wear part; as a result, it has a clearly superior tool wear resistance than an alumina ceramic tool.

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Machinability of BN free-machining steel in turning

Cited by 40 publications

References 6 publications

Basic research on mechanism of BN inclusion in improving the machinability of steel

Basic research on mechanism of BN inclusion in improving the machinability of steel

Estudio del rendimiento del torneado de alta velocidad utilizando el coeficiente de dimensión volumétrica de la fuerza de corte resultante

Wear Characteristics of Ceramic Tools When Turning BN Free-Machining Steel

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