Low-Frequency Regenerative Vibration and The Formation of Lobed Hol in Drilling  

Oleh:

Bayly, Philip V. ; Lamar, Michael T. ; Calvert, Sean G.

Jenis: Article from Journal - ilmiah internasional
Dalam koleksi: Journal of Manufacturing Science and Engineering vol. 124 no. 2 (May 2002), page 275-285.
Topik: vibrations; low - frequency; regenerative vibration; formation; lobed holes; drilling

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: JJ93.3 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

Large - amplitude vibrations in drilling often occur at frequencies near multiples of the rotation frequency, even when these are much lower than the system's first natural frequency. These vibrations are responsible for out - of - round, "lobed" holes. A simplified model of the mechanics of this phenomenon is presented in this paper. The model includes cutting and "rubbing" forces on the drill, but inertia and damping of the tool are neglected at low speeds. This quasi - static model remains dynamic because of the regenerative nature of cutting; the force on each cutting element depends on both the tool's current position and its position at the time of the previous tooth passage. Characteristic solutions, including unstable retrograde "whirling" modes, are found in terms of eigenvalues and eigenvectors of a discrete state - transition matrix. These unstable modes correspond closely to behaviour observed in drilling tests.

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