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Machining Science and Technology
An International Journal
Volume 9, 2005 - Issue 3
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Original Articles

OPTIMIZATION OF HOLLOW CANTILEVERED BORING BAR STIFFNESS

P. Szuba Textron Fastening Systems, Troy, Michigan, USACorrespondence[email protected]
,
Q. Zou Department of Mechanical Engineering, Oakland University, Rochester, Michigan, USA
,
G. C. Barber Department of Mechanical Engineering, Oakland University, Rochester, Michigan, USA
&
L. Yang Department of Mechanical Engineering, Oakland University, Rochester, Michigan, USA
Pages 325-343 | Published online: 31 Aug 2006
 
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ABSTRACT

Precision line boring is a very demanding application in terms of both quality and production rate requirements. Machining of long bores as needed in cam and crankshafts of engine blocks requires use of dedicated equipment. In this research, cantilevered boring bar mechanics, in particular bar stiffness, is studied. First, the effects of shape optimization are studied, including the effect of hollowing the boring bar. Secondly, the effects of reinforcing a bar with axial reinforcement materials are studied, followed by a derivation of the equations for deflections, natural frequency of vibration, and stiffness. Finally, finite elements are used to verify these equations.

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