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TECHNICAL PAPERS

Prediction of Coolant Pressure and Volume Flow Rate in the Gundrilling Process

[+] Author and Article Information
Jinhyuk Jung, Jun Ni

Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109

J. Manuf. Sci. Eng 125(4), 696-702 (Nov 11, 2003) (7 pages) doi:10.1115/1.1621427 History: Received November 01, 2001; Revised July 01, 2003; Online November 11, 2003
Copyright © 2003 by ASME
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References

Astakhov,  V. P., Frazao,  J., and Osman,  M. O. M., 1994, “On the Experimental Optimization of Tool Geometry for Uniform Pressure Distribution in Single Edge Gundrilling,” ASME J. Eng. Ind., 116, pp. 449–456, Nov.
Astakhov,  V. P., Galitsky,  V. V., and Osman,  M. O. M., 1995, “A Novel Approach to the Design of Self-Piloting Drills With External Chip Removal, Part 2: Bottom Clearance Topology and Experimental Results,” ASME J. Eng. Ind., 117, pp. 464–474, Nov.
Latinovic,  V., and Osman,  M. O. M., 1986, “Friction Losses in Coolant Flow through Kidney shaped Gundrill Shank,” Int. J. Prod. Res., 24(6), pp. 1319–1329.
Carlsen,  L. W., and Irvine,  T. F., 1961, “Fully developed Pressure Drop in Triangular shaped Ducts,” ASME J. Heat Transfer, 83(441), Nov.
Eckert, E. R. G., and Irvine, T. F., Jr., 1957, “Incompressible Friction Factor, Transition, and Hydrodynamic Entrance Length Studies of Ducts with Triangular and Rectangular Cross-section,” Proceedings of the Fifth Midwestern Conference on Fluid Mechanics, University of Michigan Press.
Hannett,  J. P., Koh,  J. C. Y., and McComas,  S. T., 1962, “A Comparison of Predicted and Measured Friction Factors for Turbulent Flow through Rectangular Ducts,” ASME J. Heat Transfer, 84(82), Feb.
White, F. M., 1986, Fluid Mechanics, McGraw-Hill International Editions, Second Edition, Singapore, pp. 302–338.
Colebrook,  C. F., 1938–1939, “Turbulent Flow in Pipes, with Particular Reference to the Transition between the Smooth and Rough Pipe Laws,” J. Inst. Civ. Eng. Lond., 11, pp. 133–156.

Figures

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Major elements of a gundrilling system
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The nomenclature of gundrill geometry
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Designation of pressure and dimensions in the modeled gundrill coolant channel system
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Illustration of a bottom clearance zone
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A simplified valve model representing the bottom clearance zone
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A parallel pipe model representing dual coolant holes
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The position of a sectioning plane and the viewing direction
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Solid models of the gundrill heads-the whole views (left) and cross-sectional views (right). Note: The boundary of Ao is denoted with broken lines.
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The photographs of the shank cross-sections of the tested gundrills
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Good agreement between measured and predicted coolant volume flow rates in GPM (gallons per minute)
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Constancy of coolant volume flow rate (Q) along the drilling positions in a hole
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A parametric study on the effect of duct diameter (D4) of the drill head on Q and p7
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A parametric study on the saturation of Q and p7 with respect to Ao for water base coolant and SAE30 oil
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A parametric study on the effect of duct diameter (D3) of the shank on Q and p7 for type A, B, and C drills

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