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TECHNICAL PAPERS

Whirling Vibrations in Boring Trepanning Association Deep Hole Boring Process: Analytical and Experimental Investigations

[+] Author and Article Information
Hussien M. Al-Wedyan1

Department of Mechanical and Industrial Engineering, Concordia University, 1455 De Maisonneuve Boulevard, Montreal, Quebec H3G 1M8, Canadahwedyan@hotmail.com

Rama B. Bhat

Department of Mechanical and Industrial Engineering, Concordia University, 1455 De Maisonneuve Boulevard, Montreal, Quebec H3G 1M8, Canadarbhat@vax2.concordia.ca

Kudret Demirli

Department of Mechanical and Industrial Engineering, Concordia University, 1455 De Maisonneuve Boulevard, Montreal, Quebec H3G 1M8, Canadademirli@alcor.concordia.ca

1

Author to whom correspondence should be addressed.

J. Manuf. Sci. Eng 129(1), 48-62 (Mar 13, 2006) (15 pages) doi:10.1115/1.2280610 History: Received June 21, 2004; Revised March 13, 2006

An approach to study the whirling motion of the BTA (boring trepanning association) deep hole boring system is presented by introducing the system excitation in the form of internal forces between the boring bar and the workpiece. This involves nonhomogeneous boundary conditions with homogeneous equations. The mathematical approach with the boring bar-workpiece internal cutting forces and external suppression forces will transform the problem into nonhomogeneous equations with homogenous boundary conditions. Using this approach the whirling motion of the boring bar is obtained at different points on the boring bar-workpiece assembly. External suppression forces will reduce the whirl amplitude at the same locations. Further, an experimental investigation is carried out on the BTA deep hole boring process while drilling at four cutting speeds using proximity pickups for displacement measurements.

Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 2

The Y (—) and Z (⋯) signals with and without suppression forces for the boring bar-workpiece system at ω=60rad∕s in 0<X¯<L¯1 at L¯=0.41

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Figure 3

The Z and Y signals for the boring bar-workpiece system in 0<X¯<L¯1, L¯1<X¯<L¯2, and L¯2<X¯<1 at L¯=0.41, L¯=0.81, and L¯=0.91.

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Figure 4

Schematic presentation of experimental setup, the proximity pickups were located at 1.25m from the boring bar cutting head

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Figure 5

The frame and the two measuring sensors

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Figure 6

The master calibration with y=1.3787x+0.0003

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Figure 7

The slave calibration with y=1.3379x+0.0002

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Figure 8

Part 2: Schematic representation the experiment at different speeds of rotation

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Figure 9

Part 2: Picture of the experiment done at different speeds of rotation

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Figure 10

At a speed of 1200rpm (a) the master (dot line) and the slave (continuous line) signals and, (b) the whirl orbit

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Figure 11

At a speed of 1280rpm (a) the master (dot line) and the slave (continuous line) signals, (b) The whirl orbit

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Figure 12

At a speed of 1359rpm (a) the master (dot line) and the slave (continuous line) signals, (b) The whirl orbit

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Figure 13

At a speed of 1440rpm (a) the master (dot line) and the slave (continuous line) signals, (b) The whirl orbit

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Figure 14

Amplitude spectral density for a speed of (a) 1200rpm for Z and Y, and (b) 1280rpm for Z and Y

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Figure 15

Amplitude spectral density for a speed of (a) 1359rpm for Z and Y, and (b) 1440rpm for Z and Y

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Figure 1

Boring bar-workpiece assembly with the cutting forces and control forces

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