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Title: Chatter suppression through variable impedance and smart fluids

Abstract

A novel approach to mitigating chatter vibrations in machine tools is presented. Encountered in many types of metal removal processes, chatter is a dangerous condition which results from the interaction of the cutting dynamics with the modal characteristics of the machine-workpiece assembly. Tool vibrations are recored on the surface of the workpiece during metal removal, imposing a waviness which alters the chip thickness during subsequent cutting passes. Deviations from the nominal chip thickness effect changes in the cutting force which, under certain conditions, can further excite vibrations. The chatter mitigation strategy presented is based on periodically altering the impedance of the cutting tool assembly. 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. Results from a simulated milling process reveal that significant reductions in vibration amplitude can be achieved through proper selection of fluid and excitation frequency.

Authors:
;
Publication Date:
Research Org.:
Sandia National Labs., Albuquerque, NM (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
206364
Report Number(s):
SAND-96-0253C; CONF-960268-1
ON: DE96007350
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Conference
Resource Relation:
Conference: Society of Photo-Optical Instrumentation Engineers (SPIE) smart structures and materials conference, San Diego, CA (United States), 26-29 Feb 1996; Other Information: PBD: [1996]
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; MECHANICAL VIBRATIONS; MITIGATION; MACHINE TOOLS; RHEOLOGY; IMPEDANCE; ELECTRIC FIELDS; MAGNETIC FIELDS

Citation Formats

Segalman, D, and Redmond, J. Chatter suppression through variable impedance and smart fluids. United States: N. p., 1996. Web.
Segalman, D, & Redmond, J. Chatter suppression through variable impedance and smart fluids. United States.
Segalman, D, and Redmond, J. Thu . "Chatter suppression through variable impedance and smart fluids". United States. https://www.osti.gov/servlets/purl/206364.
@article{osti_206364,
title = {Chatter suppression through variable impedance and smart fluids},
author = {Segalman, D and Redmond, J},
abstractNote = {A novel approach to mitigating chatter vibrations in machine tools is presented. Encountered in many types of metal removal processes, chatter is a dangerous condition which results from the interaction of the cutting dynamics with the modal characteristics of the machine-workpiece assembly. Tool vibrations are recored on the surface of the workpiece during metal removal, imposing a waviness which alters the chip thickness during subsequent cutting passes. Deviations from the nominal chip thickness effect changes in the cutting force which, under certain conditions, can further excite vibrations. The chatter mitigation strategy presented is based on periodically altering the impedance of the cutting tool assembly. 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. Results from a simulated milling process reveal that significant reductions in vibration amplitude can be achieved through proper selection of fluid and excitation frequency.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1996},
month = {2}
}

Conference:
Other availability
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