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Technical Briefs

Evaluation of the Performance of CBN Tools When Turning Austempered Ductile Iron Material

[+] Author and Article Information
K. Aslantas, İ. Ucun

Mechanical Education Department, Technical Education Faculty, Afyon Kocatepe University, Afyon 03200, Turkey

K. Gök

Vocational School of Kütahya, Dumlupınar University, Germiyan Campus, Kütahya, Turkey

J. Manuf. Sci. Eng 130(5), 054503 (Sep 11, 2008) (5 pages) doi:10.1115/1.2977825 History: Received July 19, 2007; Revised June 10, 2008; Published September 11, 2008

The study deals with the machinability properties of austempered ductile iron using cubic boron nitride cutting tools. To emphasize the role of the austempering process, ductile iron specimens were first austenitized in salt bath at 900°C for 60min, after which they were quenched in a salt bath at 250°C and 325°C for 60min. Machining tests were carried out at various cutting speeds under the constant depth of cut and the feed rate. Tool performance was evaluated based on the workpiece surface roughness and flank wear. The influence of the austempering temperature and cutting speed on the chip form was also studied. The results point out that the lower austempering temperature results in the increase in the cutting forces, while better surface roughness is attained.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Microstructure of the ductile iron material: (a) as-cast, (b) as-cast, (c) austempered at 250°C for 60min, (d) austempered at 325°C for 60min

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Figure 2

Effect of the cutting speed and austempering temperature on (a) primary (Fp), (b) feed (Ff), and (c) thrust (Ft) forces

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Figure 3

The effect of the cutting speed and austempering temperature on chip form: (a) as-cast, V=100m∕min, (b) as-cast, V=400m∕min, (c) ADI-250°C, V=100m∕min, (d) ADI-250°C, V=400m∕min, (e) ADI-325°C, V=100m∕min, (f) ADI-325°C, V=400m∕min

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Figure 4

Variation of flank wear with cutting length at various cutting speeds for (a) as-cast material, (b) ADI-325°C, and (c) ADI-250°C

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Figure 5

SEM micrograph of CBN insert (a) after cutting ADI-250°C at 300m∕min, (b) after cutting ADI-325°C at 300m∕min, and (c) after cutting DI at 300m∕min

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Figure 6

Variation of the surface roughness with the cutting speed and austempering temperature

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