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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
Publication Date:
Research Org.:
Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States)
OSTI Identifier:
872532
Patent Number(s):
US 5957016
Assignee:
Sandia Corporation (Albuquerque, NM)
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; /82/409/

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., 1999. 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. 1999. "Method and apparatus for suppressing regenerative instability and related chatter in machine tools". United States. https://www.osti.gov/servlets/purl/872532.
@article{osti_872532,
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 = {},
url = {https://www.osti.gov/biblio/872532}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Jan 01 00:00:00 EST 1999},
month = {Fri Jan 01 00:00:00 EST 1999}
}

Works referenced in this record:

Analysis and Design of Machine Tool Chatter Control Systems Using the Regeneration Spectrum
journal, September 1978


Suppression of self-excited vibration by the spindle speed variation method
journal, January 1984


Active flexible rods with embedded SMA fibers
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Active Control of Machine-Tool Chatter
journal, June 1970


A closed loop stabilization technique eliminating machine tool chatter
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An Investigation of Computer Control of Machining Chatter
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Vibration Suppression by Modulation of Elastic Modulus Using Shape Memory Alloy
conference, March 2021

  • Segalman, Daniel J.; Parker, Gordon G.; Inman, Daniel J.
  • ASME 1993 Design Technical Conferences, 14th Biennial Conference on Mechanical Vibration and Noise: Intelligent Structures, Materials, and Vibrations
  • https://doi.org/10.1115/DETC1993-0151

Low vibration control system in turning
journal, October 1992


Application of Controlled Mechanical Impedance for Reducing Machine Tool Vibrations
journal, November 1969