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:
-
- Albuquerque, NM
- Issue Date:
- Research Org.:
- Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States)
- OSTI Identifier:
- 873558
- Patent Number(s):
- 6189426
- Assignee:
- Sandia Corporation (Albuquerque, NM)
- Patent Classifications (CPCs):
-
B - PERFORMING OPERATIONS B23 - MACHINE TOOLS B23B - TURNING
B - PERFORMING OPERATIONS B23 - MACHINE TOOLS B23C - MILLING
- 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 = {Mon Jan 01 00:00:00 EST 2001},
month = {Mon Jan 01 00:00:00 EST 2001}
}