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Title: Method and apparatus for suppressing regenerative instability and related chatter in machine tools

Abstract

Methods of and apparatuses for mitigating chatter vibrations in machine tools or components thereof. Chatter therein is suppressed by periodically or continuously varying the stiffness of the cutting tool (or some component of the cutting tool), and hence the resonant frequency of the cutting tool (or some component thereof). The varying of resonant frequency of the cutting tool can be accomplished by modulating the stiffness of the cutting tool, the cutting tool holder, or any other component of the support for the cutting tool. By periodically altering the impedance of the cutting tool assembly, chatter is mitigated. In one embodiment, a cyclic electric (or magnetic) field is applied to the spindle quill which contains an electro-rheological (or magneto-rheological) fluid. The variable yield stress in the fluid affects the coupling of the spindle to the machine tool structure, changing the natural frequency of oscillation. Altering the modal characteristics in this fashion disrupts the modulation of current tool vibrations with previous tool vibrations recorded on the workpiece surface.

Inventors:
 [1];  [1]
  1. (Albuquerque, NM)
Issue Date:
Research Org.:
SANDIA CORP
OSTI Identifier:
873558
Patent Number(s):
6189426
Assignee:
Sandia Corporation (Albuquerque, NM) SNL
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; apparatus; suppressing; regenerative; instability; related; chatter; machine; tools; methods; apparatuses; mitigating; vibrations; components; therein; suppressed; periodically; continuously; varying; stiffness; cutting; tool; component; hence; resonant; frequency; accomplished; modulating; holder; support; altering; impedance; assembly; mitigated; embodiment; cyclic; electric; magnetic; field; applied; spindle; quill; contains; electro-rheological; magneto-rheological; fluid; variable; yield; stress; affects; coupling; structure; changing; natural; oscillation; modal; characteristics; fashion; disrupts; modulation; current; previous; recorded; workpiece; surface; natural frequency; workpiece surface; tool assembly; machine tools; tool holder; resonant frequency; cutting tool; machine tool; continuously varying; related chatter; regenerative instability; chatter vibrations; chatter therein; mitigating chatter; suppressing regenerative; periodically alter; /82/408/409/

Citation Formats

Segalman, Daniel J., and Redmond, James M. Method and apparatus for suppressing regenerative instability and related chatter in machine tools. United States: N. p., 2001. Web.
Segalman, Daniel J., & Redmond, James M. Method and apparatus for suppressing regenerative instability and related chatter in machine tools. United States.
Segalman, Daniel J., and Redmond, James M. Mon . "Method and apparatus for suppressing regenerative instability and related chatter in machine tools". United States. https://www.osti.gov/servlets/purl/873558.
@article{osti_873558,
title = {Method and apparatus for suppressing regenerative instability and related chatter in machine tools},
author = {Segalman, Daniel J. and Redmond, James M.},
abstractNote = {Methods of and apparatuses for mitigating chatter vibrations in machine tools or components thereof. Chatter therein is suppressed by periodically or continuously varying the stiffness of the cutting tool (or some component of the cutting tool), and hence the resonant frequency of the cutting tool (or some component thereof). The varying of resonant frequency of the cutting tool can be accomplished by modulating the stiffness of the cutting tool, the cutting tool holder, or any other component of the support for the cutting tool. By periodically altering the impedance of the cutting tool assembly, chatter is mitigated. In one embodiment, a cyclic electric (or magnetic) field is applied to the spindle quill which contains an electro-rheological (or magneto-rheological) fluid. The variable yield stress in the fluid affects the coupling of the spindle to the machine tool structure, changing the natural frequency of oscillation. Altering the modal characteristics in this fashion disrupts the modulation of current tool vibrations with previous tool vibrations recorded on the workpiece surface.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2001},
month = {1}
}

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