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Research Papers

Experimental Examination of the Impact of Tool Radius on Specific Energy in Microcutting of Granite

[+] Author and Article Information
Miloš Pjević

Faculty of Mechanical Engineering,
University of Belgrade,
Kraljice Marije 16,
Belgrade 11120, Serbia
e-mails: mpjevic@mas.bg.ac.rs;
m.pjevic@gmail.com

Ljubodrag Tanović

Faculty of Mechanical Engineering,
University of Belgrade,
Kraljice Marije 16,
Belgrade 11120, Serbia
e-mail: ltanovic@mas.bg.ac.rs

Goran Mladenović

Faculty of Mechanical Engineering,
University of Belgrade,
Kraljice Marije 16,
Belgrade 11120, Serbia
e-mail: gmladenovic@mas.bg.ac.rs

Biljana Marković

Faculty of Mechanical Engineering,
University of East Sarajevo,
Vuka Karadžića 30,
East Sarajevo 71123,
Republic of Srpska, Bosnia
and Herzegovina
e-mail: biljana46m@gmail.com

1Corresponding author.

Contributed by the Materials Division of ASME for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received October 13, 2016; final manuscript received March 2, 2017; published online May 16, 2017. Assoc. Editor: Ghatu Subhash.

J. Eng. Mater. Technol 139(4), 041004 (May 16, 2017) (7 pages) Paper No: MATS-16-1290; doi: 10.1115/1.4036585 History: Received October 13, 2016; Revised March 02, 2017

The paper presents experimental results of microcutting brittle materials (granite). The analysis was conceived on the observed interaction between the workpiece and two tools of different shapes. Experiment was based on scratching the workpiece surface with diamond tools. Applied tools had tip radius R0.2 and R0.15 mm. The experiment determined the changes in the value of perpendicular and tangential components of the cutting force based on the geometric properties of tools, as well as the changes of the specific energy of microcutting granite (Jošanica and Bukovik types). The experiment has shown that reduction of tool radius causes reduction of the cutting force intensity and specific cutting energy. Because of its physical/mechanical properties, more energy is required for micromachining granite “Jošanica” than “Bukovik.” Based on the topography of the surface, the value of critical tool penetration depth was established, after which the brittle fracture is no longer present. For granite “Jošanica” values of critical penetration depth are 6 and 5 μm when micromachining with tools R0.2 and R0.15 mm, while for Bukovik those values are 6.5 and 5.5 μm. The paper should form the basis for understanding the phenomena which occur during microcutting brittle materials.

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References

Figures

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Fig. 1

Schematic representation of a formed groove

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Fig. 2

The stress field in the case of: (a) greater and (b) smaller tool radius

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Fig. 3

Schematic representation of the experimental setup

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Fig. 4

Diamond tools with: (a) tip radius of 0.15 mm and (b) tip radius of 0.2 mm

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Fig. 5

Cross section of the formed groove

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Fig. 6

Physical and mechanical properties of the materials used, Tanovic et al. [21]

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Fig. 7

Experimental setup for conducting the experiment consists of (a) machine-dynamometer-special fixture-workpiece-tool and (b) the system for gathering and processing data

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Fig. 8

Graphic representation of the measurements of the vertical component FV of the cutting force for one passage of the tool

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Fig. 9

Values of the perpendicular Fn and tangential Ft cutting force components when microcutting: (a) Jošanica and (b) Bukovik granite at the cutting speed of VS = 25 m/s and tool radius R0.2 mm

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Fig. 10

Values of the perpendicular Fn and tangential Ft cutting component forces when microcutting: (a) Jošanica and (b) Bukovik granite at the cutting speed of VS = 25 m/s and tool radius of R0.15 mm

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Fig. 11

Specific microcutting energy for (a) Jošanica and (b) Bukovik granite at the cutting speed of VS = 25 m/s and tool radii of R0.2 mm and R0.15 mm

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Fig. 12

Grooves in the Jošanica granite, machined with the tool tip radius: (a) R0.2 mm and (b) R0.15 mm

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Fig. 13

Grooves in the Bukovik granite machined with the tool tip radius: (a) R0.2 mm, (b) R0.2 mm, and (c) R0.15 mm

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