WO1999004181A3 - Vibration control apparatus and method for calender rolls and the like - Google Patents

Vibration control apparatus and method for calender rolls and the like Download PDF

Info

Publication number
WO1999004181A3
WO1999004181A3 PCT/US1998/014556 US9814556W WO9904181A3 WO 1999004181 A3 WO1999004181 A3 WO 1999004181A3 US 9814556 W US9814556 W US 9814556W WO 9904181 A3 WO9904181 A3 WO 9904181A3
Authority
WO
WIPO (PCT)
Prior art keywords
vibration
rolls
control
active
roll
Prior art date
Application number
PCT/US1998/014556
Other languages
French (fr)
Other versions
WO1999004181A2 (en
Inventor
Dino J Rossetti
Stephen F Hildebrand
John J Quinn
Mark A Norris
Lane R Miller
Original Assignee
Lord Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lord Corp filed Critical Lord Corp
Priority to CA002295764A priority Critical patent/CA2295764A1/en
Publication of WO1999004181A2 publication Critical patent/WO1999004181A2/en
Publication of WO1999004181A3 publication Critical patent/WO1999004181A3/en

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16FSPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/02Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B37/00Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/007Control for preventing or reducing vibration, chatter or chatter marks
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21GCALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00Calenders; Smoothing apparatus
    • D21G1/0073Accessories for calenders
    • D21G1/008Vibration-preventing or -eliminating devices
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16FSPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/02Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
    • F16F15/03Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using magnetic or electromagnetic means
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B1/00Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/222Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a rolling-drawing process; in a multi-pass mill
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B2203/00Auxiliary arrangements, devices or methods in combination with rolling mills or rolling methods
    • B21B2203/44Vibration dampers

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Electromagnetism (AREA)
  • Paper (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Abstract

A vibration control apparatus (20, etc.) and method for a calender (18, etc.) for controlling vibration between two or more rolls (ex. 22, 24, etc.) which controls vibration induced thickness variations in a medium (27) exiting from the nip. The apparatus (20, etc.) includes a frame (19, etc.), a first and second rolls (22, 24, etc.) mounted relative to the frame, and a force generator (32, etc.), such as an electro-mechanical active actuator, servo-hydraulic actuator, controllable semi-active damper, Active Vibration Absorber (AVA), or Adaptive Tuned Vibration Absorber (ATVA), provides cancelling forces to control vibration between the first and second roll (22, 24, etc.) thereby, controlling such vibration induced thickness variations in the medium (27). Preferably, the apparatus includes at least one sensor (ex. 42, 42', 42', 42''', etc.) for providing a signal representative of a vibration condition of at least one of the first or second roll (22, 24, etc.), and preferably both, and a digital controller (50, etc.) for processing the signal representative of said vibration condition preferably according to a feed-forward-type control and providing a control signal to a force generator (32, etc.). Vertical and/or lateral vibration of the rolls (22, 24, etc.) may be controlled simultaneously. Likewise, fundamental vibrational frequencies and their harmonics may be controlled individually, or in combination.
PCT/US1998/014556 1997-07-15 1998-07-14 Vibration control apparatus and method for calender rolls and the like WO1999004181A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA002295764A CA2295764A1 (en) 1997-07-15 1998-07-14 Vibration control apparatus and method for calender rolls and the like

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/892,788 US5961899A (en) 1997-07-15 1997-07-15 Vibration control apparatus and method for calender rolls and the like
US08/892,788 1997-07-15

Publications (2)

Publication Number Publication Date
WO1999004181A2 WO1999004181A2 (en) 1999-01-28
WO1999004181A3 true WO1999004181A3 (en) 1999-04-15

Family

ID=25400485

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1998/014556 WO1999004181A2 (en) 1997-07-15 1998-07-14 Vibration control apparatus and method for calender rolls and the like

Country Status (3)

Country Link
US (1) US5961899A (en)
CA (1) CA2295764A1 (en)
WO (1) WO1999004181A2 (en)

Families Citing this family (43)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19652769A1 (en) * 1996-12-18 1998-06-25 Voith Sulzer Papiermasch Gmbh Method and device for damping contact vibrations
FI104207B (en) * 1998-07-24 1999-11-30 Valmet Corp A method and apparatus for changing the characteristic frequency of a nip roll structure of a paper or board machine
CA2279609C (en) * 1998-08-06 2007-05-01 Voith Sulzer Papiertechnik Patent Gmbh Device to actively weaken undesirable vibrations in a rotating roll; device for treatment of a material web; specifically a paper or cardboard web
FI104121B (en) * 1998-08-14 1999-11-15 Valmet Corp Method and apparatus for changing the intrinsic frequency of a nip roll construction in a paper or cardboard machine
US6257133B1 (en) * 1999-03-15 2001-07-10 International Paper Method and apparatus for controlling cross directional nip dynamics
US6361483B1 (en) 1999-10-22 2002-03-26 Morrison Berkshire, Inc. System for controlling vibration of a dynamic surface
DE10008800B4 (en) 2000-02-25 2005-10-27 Voith Paper Patent Gmbh Method for operating a calender roll and calender roll
FI20010250A (en) * 2001-02-09 2002-08-10 Metso Paper Inc A method for controlling a process machine
US6694856B1 (en) 2001-02-22 2004-02-24 The University Of Maryland Magnetorheological damper and energy dissipation method
FI110712B (en) * 2001-04-19 2003-03-14 Erno Keskinen Plant for controlling the oscillation of rotating rollers
DE10125192A1 (en) * 2001-05-23 2002-11-28 Voith Paper Patent Gmbh Method and device for active vibration damping in winding machines
DE10133891C1 (en) * 2001-07-12 2002-11-28 Voith Paper Patent Gmbh Paper calendar including resilient surface in roller stack, controls roller offset in terms of critical resonant frequency within stack
DE10133888C1 (en) * 2001-07-12 2002-11-28 Voith Paper Patent Gmbh Operation of roller stack including resiliently-surfaced roller which can be offset transversely with respect to pressing direction
DE10133889C1 (en) * 2001-07-12 2002-11-28 Voith Paper Patent Gmbh Operation of calender with roller stack including resilient surface, periodically offsets one or more rollers with respect to pressing plane
DE10133890C1 (en) 2001-07-12 2002-12-05 Voith Paper Patent Gmbh Operation of calender roller stack to prevent striped patterning, adjusts soft roller transversely with respect to pressing direction as function of wavelength
EP1483444B1 (en) * 2002-02-01 2005-12-28 Koenig & Bauer Aktiengesellschaft Method and device for reducing vibrations in rotating components
DE10204770B4 (en) * 2002-02-05 2005-03-31 Eduard Küsters Maschinenfabrik GmbH & Co. KG Method for actively damping vibrations in a device for processing a moving web, device suitable for carrying out this method and roller suitable for use in this device
FI20030377A0 (en) * 2003-03-13 2003-03-13 Metso Paper Inc Method of calendering and calender
US7048828B2 (en) * 2003-11-26 2006-05-23 Metso Paper, Inc. Crimper with crimping wheels mounted on linear bearings
FI115984B (en) * 2003-11-27 2005-08-31 Metso Paper Inc Method and arrangement for preventing oscillation in a multi-nip calender or calender array
US7219747B2 (en) * 2004-03-04 2007-05-22 Halliburton Energy Services, Inc. Providing a local response to a local condition in an oil well
DE102005022874A1 (en) * 2005-05-18 2006-11-23 Voith Patent Gmbh Vibration reduction in machines such as presses or calenders having nip-forming rollers uses measures involving repeatedly varying the rotational speed of the rollers
DE502005006079D1 (en) * 2005-09-20 2009-01-08 Voith Patent Gmbh Reel winding device
FI118858B (en) * 2005-09-30 2008-04-15 Metso Paper Inc A system for damping and preventing vibrations in a paper machine part
US8020792B2 (en) * 2005-12-27 2011-09-20 Metso Minerals Industries, Inc. Locked charge detector
US7543687B2 (en) * 2006-03-16 2009-06-09 Delphi Technologies, Inc. Piston damper assembly, and dust tube subassembly, having a position sensor
DE102006031022A1 (en) * 2006-07-05 2008-01-10 Voith Patent Gmbh vibration damping
EP1921502B1 (en) * 2006-11-08 2011-02-02 Integrated Dynamics Engineering GmbH Combined motion control system
US20100206033A1 (en) * 2007-05-01 2010-08-19 Toshiba Mitsubishi-Electric Industrial Systems Corporation Driving device of motors for rolling rolls
DE102007055850A1 (en) 2007-12-18 2009-06-25 Voith Patent Gmbh Method and device for suppressing vibrations and / or variations in a paper machine
DE102008004565A1 (en) * 2008-01-15 2009-07-23 Ab Skf Active damped bearing arrangement
IT1390945B1 (en) * 2008-08-06 2011-10-27 Futura Spa ROLLER FOR THE TREATMENT OF NASTRIFORM CARTACEOUS MATERIAL
US9097595B2 (en) 2008-11-14 2015-08-04 Stowe Woodward, L.L.C. System and method for detecting and measuring vibration in an industrial roll
FI121276B (en) * 2009-02-20 2010-09-15 Metso Paper Inc Arrangement for damping vibration in a fiber web machine
DE102009003148A1 (en) 2009-05-15 2010-11-18 Voith Patent Gmbh Method for compensating variations in operation mode of machine for producing fibrous web e.g. paper web, involves controlling actuators for producing reaction, which counter acts variations caused by agent
DE102010002703A1 (en) * 2010-03-09 2011-09-15 Metso Paper, Inc. Arrangement for regulating force in gap between two rollers in paper- or cardboard machine, has spring rate changing units for changing spring rate of rolling system under retention of force between rollers and position of one of rollers
NL2006686C2 (en) 2011-04-29 2012-10-30 Micro Turbine Technology B V An integral method for vibration compensation and misalignment prevention in rotor dynamic systems.
US20120323354A1 (en) 2011-06-14 2012-12-20 M.I.C. Industries, Inc. Systems and Methods for Making Panels from Sheet Material Using Adaptive Control
EP2754750A1 (en) 2013-01-11 2014-07-16 Valmet Technologies, Inc. Arrangement for controlling vibrations in a fiber web machine and a linear motion amplifier
EP3825228A1 (en) * 2013-01-18 2021-05-26 LORD Corporation Devices, systems, and methods for active vibration control force, speed and vibration monitoring and control
US10213999B1 (en) 2013-05-13 2019-02-26 Rockwell Collins, Inc. Systems and methods for roll to roll laminations
CN103521531B (en) * 2013-11-07 2015-06-10 天津理工大学 Fault diagnosis and feedback system according to third octave flutter of high-speed cold rolling mill
CN116550759B (en) * 2023-07-11 2023-09-15 太原理工大学 Vibration suppression method and system for rolling mill roller system based on vibration damper

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2613453A1 (en) * 1976-03-30 1977-10-13 Bernhard Bruene Coiling machine for metal foil - is designed to eliminate vibrational stresses causing deformation of the foil
DE3627463A1 (en) * 1986-08-13 1988-02-18 Smg Stahlkontor Maschinenbau G Device for the closed-loop or open-loop control of a contact roller
EP0502434A1 (en) * 1991-03-04 1992-09-09 Gruppo Colines S.R.L. A winding apparatus for sheet material web
DE4201327A1 (en) * 1992-01-20 1993-07-22 Feldmuehle Ag Stora Winding device for film foil or paper webs with rough surface - has pressure cylinder connected to buffer filled with pressurised gas, gas chamber being separated from hydraulic chamber by membrane
GB2290635A (en) * 1994-06-18 1996-01-03 Lord Corp Active control of noise and vibration
EP0819638A2 (en) * 1996-07-19 1998-01-21 Voith Sulzer Papiermaschinen GmbH Method of and device for winding a paper web in a roll with active vibration damper
US5771793A (en) * 1995-05-24 1998-06-30 Voith Sulzer Finishing Gmbh Calender having a control device

Family Cites Families (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3077800A (en) * 1958-05-09 1963-02-19 Youngstown Res And Dev Company Apparatus and method for detecting and compensating for roll deflection on a rollingmill
GB1194205A (en) * 1966-08-15 1970-06-10 Beloit Corp Self-Damped Calender Roll.
US3487888A (en) * 1966-08-22 1970-01-06 Mc Donnell Douglas Corp Cabin engine sound suppressor
US3512475A (en) * 1968-09-21 1970-05-19 Beloit Corp Self-damped calender roll
US3483951A (en) * 1968-12-06 1969-12-16 Wisconsin Alumni Res Found Self-optimizing vibration dampers
US3807678A (en) * 1972-09-19 1974-04-30 Lord Corp System for controlling the transmission of energy between spaced members
US3881335A (en) * 1974-03-07 1975-05-06 Westinghouse Electric Corp Roll eccentricity correction system and method
JPS5638281B2 (en) * 1974-05-31 1981-09-05
DE2830733C3 (en) * 1978-07-13 1982-05-06 Kleinewefers Gmbh, 4150 Krefeld Device for quickly separating the rolls of a calender
DE2943644A1 (en) * 1979-10-29 1981-05-07 Küsters, Eduard, 4150 Krefeld ROLLER ARRANGEMENT FOR PRESSURE TREATING TRACKS
DE3004915C2 (en) * 1980-02-09 1982-07-15 Kleinewefers Gmbh, 4150 Krefeld calender
US4491207A (en) * 1983-07-15 1985-01-01 Lord Corporation Fluid control means for vehicle suspension system
US4715559A (en) * 1986-05-15 1987-12-29 Fuller Christopher R Apparatus and method for global noise reduction
DE3638070A1 (en) * 1986-11-07 1988-05-19 Voith Gmbh J M ROLLER
US4836342A (en) * 1987-08-07 1989-06-06 Lord Corporation Controllable fluid damper assembly
US4907680A (en) * 1988-01-29 1990-03-13 Lord Corporation Semi-active damper piston valve assembly
DE3815445A1 (en) * 1988-05-06 1989-11-16 Kuesters Eduard Maschf METHOD FOR REDUCING VIBRATIONS ON SUCCESSIVE ROLLER PAIRS AND DEVICE HAVING SUCH ROLLER PAIRS
US5201586A (en) * 1988-09-22 1993-04-13 Basf Aktiengesellschaft Arrangement for the dynamic compensation of eccentricities of solids of rotation
FI83346C (en) * 1989-01-27 1991-06-25 Valmet Paper Machinery Inc CALENDAR, SAERSKILT EN SUPERKALANDER.
US4921272A (en) * 1989-02-10 1990-05-01 Lord Corporation Semi-active damper valve means with electromagnetically movable discs in the piston
US5004079A (en) * 1989-02-10 1991-04-02 Lord Corporation Semi-active damper valve means and method
DE3935434A1 (en) * 1989-10-25 1991-05-02 Schloemann Siemag Ag METHOD FOR COMPENSATING DISTURBANCES CAUSED BY ROLLER Eccentricities
US5018606A (en) * 1990-01-10 1991-05-28 Lord Corporation Electrophoretic fluid damper
JP2972371B2 (en) * 1991-04-10 1999-11-08 株式会社東芝 Roll eccentricity control device
US5396973A (en) * 1991-11-15 1995-03-14 Lord Corporation Variable shock absorber with integrated controller, actuator and sensors
US5207774A (en) * 1991-11-27 1993-05-04 Lord Corporation Valving for a controllable shock absorber
US5231336A (en) * 1992-01-03 1993-07-27 Harman International Industries, Inc. Actuator for active vibration control
US5310137A (en) * 1992-04-16 1994-05-10 United Technologies Corporation Helicopter active noise control system
US5277281A (en) * 1992-06-18 1994-01-11 Lord Corporation Magnetorheological fluid dampers
US5284330A (en) * 1992-06-18 1994-02-08 Lord Corporation Magnetorheological fluid devices
US5251863A (en) * 1992-08-12 1993-10-12 Noise Cancellation Technologies, Inc. Active force cancellation system
DE4231615A1 (en) * 1992-09-22 1994-03-24 Siemens Ag Method for suppressing the influence of roll eccentricities on the control of the rolling stock thickness in a roll stand
DE4235421C1 (en) * 1992-10-21 1993-09-23 Kleinewefers Gmbh, 47803 Krefeld, De
FI95062C (en) * 1993-12-29 1995-12-11 Valmet Paper Machinery Inc Calendar
DE59501395D1 (en) * 1994-03-29 1998-03-12 Siemens Ag Method for suppressing the influence of roll eccentricities on the control of the rolling stock thickness in a roll stand
EP0698427B1 (en) * 1994-07-28 1997-12-03 Siemens Aktiengesellschaft Process for suppressing the influence of roll eccentricities
US5615763A (en) * 1995-08-18 1997-04-01 Carrier Vibrating Equipment, Inc. Vibratory conveyor system for adjusting the periodic resultant forces supplied to a conveyor trough

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2613453A1 (en) * 1976-03-30 1977-10-13 Bernhard Bruene Coiling machine for metal foil - is designed to eliminate vibrational stresses causing deformation of the foil
DE3627463A1 (en) * 1986-08-13 1988-02-18 Smg Stahlkontor Maschinenbau G Device for the closed-loop or open-loop control of a contact roller
EP0502434A1 (en) * 1991-03-04 1992-09-09 Gruppo Colines S.R.L. A winding apparatus for sheet material web
DE4201327A1 (en) * 1992-01-20 1993-07-22 Feldmuehle Ag Stora Winding device for film foil or paper webs with rough surface - has pressure cylinder connected to buffer filled with pressurised gas, gas chamber being separated from hydraulic chamber by membrane
GB2290635A (en) * 1994-06-18 1996-01-03 Lord Corp Active control of noise and vibration
US5771793A (en) * 1995-05-24 1998-06-30 Voith Sulzer Finishing Gmbh Calender having a control device
EP0819638A2 (en) * 1996-07-19 1998-01-21 Voith Sulzer Papiermaschinen GmbH Method of and device for winding a paper web in a roll with active vibration damper

Also Published As

Publication number Publication date
US5961899A (en) 1999-10-05
WO1999004181A2 (en) 1999-01-28
CA2295764A1 (en) 1999-01-28

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