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

Patent ·
OSTI ID:872532
 [1];  [1]
  1. Albuquerque, NM
+ Show Author Affiliations

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.

Research Organization:
SANDIA CORP
DOE Contract Number:
AC04-94AL85000
Assignee:
Sandia Corporation (Albuquerque, NM)
Patent Number(s):
US 5957016
OSTI ID:
872532
Country of Publication:
United States
Language:
English

References (10)

Vibration Suppression by Modulation of Elastic Modulus Using Shape Memory Alloy
  • 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
conference March 2021
Analysis and Design of Machine Tool Chatter Control Systems Using the Regeneration Spectrum journal September 1978
Active control method for passing through critical speeds of rotating shafts by changing stiffnesses of the supports with use of memory metals journal March 1987
Active Control of Machine-Tool Chatter journal June 1970
Suppression of self-excited vibration by the spindle speed variation method journal January 1984
Application of Controlled Mechanical Impedance for Reducing Machine Tool Vibrations journal November 1969
Active flexible rods with embedded SMA fibers journal June 1992
Low vibration control system in turning journal October 1992
An Investigation of Computer Control of Machining Chatter journal November 1976
A closed loop stabilization technique eliminating machine tool chatter journal June 1969

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Related Subjects

/82/409/
accomplished
affects
altering
apparatus
apparatuses
applied
assembly
changing
characteristics
chatter
chatter therein
chatter vibrations
component
components
contains
continuously
continuously varying
coupling
current
cutting
cutting tool
cyclic
disrupts
electric
electro-rheological
embodiment
fashion
field
fluid
frequency
hence
holder
impedance
instability
machine
machine tool
machine tools
magnetic
magneto-rheological
method
methods
mitigated
mitigating
mitigating chatter
modal
modulating
modulation
natural
natural frequency
oscillation
periodically
periodically alter
previous
quill
recorded
regenerative
regenerative instability
related
related chatter
resonant
resonant frequency
spindle
stiffness
stress
structure
support
suppressed
suppressing
suppressing regenerative
surface
therein
tool
tool assembly
tool holder
tools
variable
varying
vibrations
workpiece
workpiece surface
yield