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Electrorheological Fluid Dampener for Computer Numerical Control Machining Equipment

IP.com Disclosure Number: IPCOM000114961D
Original Publication Date: 1995-Feb-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 2 page(s) / 81K

Publishing Venue

IBM

Related People

Hammack, BJ: AUTHOR [+3]

Abstract

Disclosed here is an Electroheological (ER) fluid dampening system for applications in a Computer Numerical Control (CNC) machine tool. ER fluids are made of low viscosity oils with small particles in suspension. The particles most suitable for use are semiconductive solids of high dielectric constant and about one micron in diameter, such as silica gel powders. Concentrated suspensions with particle volume exceeding 38% and with viscosity below 20 C.P. at 25 degrees C yields the best results.

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Electrorheological Fluid Dampener for Computer Numerical Control
Machining Equipment

      Disclosed here is an Electroheological (ER) fluid dampening
system for applications in a Computer Numerical Control (CNC) machine
tool.  ER fluids are made of low viscosity oils with small particles
in suspension.  The particles most suitable for use are
semiconductive solids of high dielectric constant and about one
micron in diameter, such as silica gel powders.  Concentrated
suspensions with particle volume exceeding 38% and with viscosity
below 20 C.P. at 25 degrees C yields the best results.

      The dampener consists of an anode, cathode fluid chamber and a
seal to retain the fluid (Fig. 1).  In this application the dampener
is used to control the vibration in the positioning system of a CNC
machine tool.  The ER fluid tray (Fig. 2) is mounted along side of
the lead screw drive in the positioning table.  The use of ER fluid
can effect the mechanical system in two fundamental ways.  One
involves the introduction of mechanical energy while the other
involves the modification of mechanical properties.  While ER fluids
have the ability to add small amounts of mechanical energy through
volummetric changes in this application their change in mechanical
properties is used to tune the positioning system of the machine.

      In the disclosed application the ER fluid is contained in a
tray which is mounted to the machine base beside the lead screw
drive.  the machine uses the lead screw and servo motor system to
move the table into position and hold it there.  The problem
encountered in high spee...