US3788534A - Method and apparatus for tensioning strip - Google Patents

Method and apparatus for tensioning strip Download PDF

Info

Publication number
US3788534A
US3788534A US00302687A US3788534DA US3788534A US 3788534 A US3788534 A US 3788534A US 00302687 A US00302687 A US 00302687A US 3788534D A US3788534D A US 3788534DA US 3788534 A US3788534 A US 3788534A
Authority
US
United States
Prior art keywords
strip
tension
signal
force exerting
roller
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
US00302687A
Other languages
English (en)
Inventor
C Shumaker
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
United Engineering Inc
Original Assignee
Wean United Inc
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 Wean United Inc filed Critical Wean United Inc
Application granted granted Critical
Publication of US3788534A publication Critical patent/US3788534A/en
Assigned to PITTSBURGH NATIONAL BANK reassignment PITTSBURGH NATIONAL BANK SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WEAN UNITED, INC., A CORP.OF OH
Assigned to PITTSBURGH NATIONAL BANK reassignment PITTSBURGH NATIONAL BANK SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WEAN UNITED, INC., A CORP. OH.
Assigned to WEAN UNITED, INC. reassignment WEAN UNITED, INC. RELEASED BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). TO RELEASE SECURTIY DOCUMENT RECORDED AT REEL, FRAME 4792/307 RECORDED FEB. 26, 1987 Assignors: PITTSBURGH NATIONAL BANK
Assigned to UNITED ENGINEERING ROLLING MILLS, INC. reassignment UNITED ENGINEERING ROLLING MILLS, INC. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: WEAN INCORPORATED
Assigned to UNITED ENGINEERING, INC. reassignment UNITED ENGINEERING, INC. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). EFFECTIVE DATE: 12-19-88 - DE Assignors: UNITED ENGINEERING ROLLING MILLS, INC.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/48—Tension control; Compression control
    • B21B37/50—Tension control; Compression control by looper control
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D15/00—Control of mechanical force or stress; Control of mechanical pressure
    • G05D15/01—Control of mechanical force or stress; Control of mechanical pressure characterised by the use of electric means

Definitions

  • a second roller is arranged to contact the strip and with which there is associated a load measuring device for measuring the tension in the passing strip.
  • a signal representing the measured tension in the strip is compared with a signal representing a desired tension by a control that varies the operation of the piston cylinder assembly to reduce any difference between the two signals to a desired value, for example, a zero value.
  • the present invention provides a method and apparatus for overcoming the disadvantages of the aforesaid former arrangements for use in both hot and cold rolling mills by providing a means for measuring the tension in the strip, a means for comparing the measured tension with a desired or preset tension value, and a means for varying effective force applied to the strip by a strip-engaging means to reduce any difference between the measured tension and the desired or preset tension to a desired value, for example, a zero value.
  • the present invention more particularly, provides a very accurate means for measuring the tension in a strip as it passes between rolling mill stands in the form of a roller associated with a load cell, means for comparing the measured tension with a desired tension or preset tension value and should there be a difference producing a signal to effect a change in the pressure of a piston cylinder assembly that moves a looper roller, distinct from the measuring roller, into engagement with the strip to vary the strip tension to reduce the difference to a desired value.
  • a still further object of the present invention provides for the length of the strip that extends between two mill stands being controlled by a non-linear control device associated with the looper roller and which effects a change in the mill speed to keep the looper roller within a desired working range.
  • FIG. 1 there is diagrammatically illustrated two adjacent mill stands 11 and 12 of a cold tandem rolling mill for reducing mild carbon steel strip while subject to interstand tension and moving in the direction of the arrow 13.
  • the construction and operation of the mill stands follow well-known practice; in which FIG. 1 shows only one of the housing posts 14 and 15 of the mill stands and their respective working rolls 16 and 17 and backup rolls l8 and 19.
  • a second roller 29 is arranged to engage the strip.
  • the roller 29 is rotatably mounted on the end of an arm 30 which is pivotally carried by a shaft 31 secured to the housing post 14.
  • the arm 30 is provided with a flat surface 33 that engages the top surface of an electrical load cell 34 provided for accurately measuring the downward force imposed on the roller 29 by the strip.
  • the load cell may take several well-known forms commonly employed in rolling mill applications.
  • a third freely rotatable roller 37 is arranged directly above the shafts 23 and 31 and adjustable relative to the strip by a vertical movable link 38.
  • roller 40 Adjacent to the post 15 of the mill stand 12 is located a fourth roller 40 arranged normally above the strip and at an elevation slightly below the operative position of the roller 37.
  • the roller 40 is mounted freely rotatably in a frame 41 which is adjustable vertically by virtue of a piston cylinder assembly 42. As noted in FIG. 1, the relationship and location of the rollers 25, 29, 37 and 40 are such that the strip is always held in positive contact with the tension measuring roller 29.
  • Rollers 44 located between the working roll 17 of the mill stand 12 and the roller 25 are two of several provided to support the strip passing between the stands 11 and 12.
  • the piston cylinder assembly 26, the load cell 34 and the motor or motors for the stand 11 are inter-related by an electrical control in order to very accurately control the tension in the strip passing between the stands 11 and 12.
  • the control includes a comparing amplifier 44 of a well-known type which receives an electrical signal over the line 45 representing a preset or desired tension in the strip as it passes between the stands 11 and 12.
  • the preset or desired tension is compared in the amplifier 44 with a signal received over a line 46 from the load cell 34 representing the actual tension in the strip as determined from the force exerted by the strip against the roller 29.
  • the amplifier 44 through a line 48 effects operation of a servo-valve 49 associated with the double-acting piston cylinder assembly 26.
  • the extent and direction of operation of the piston cylinder assembly 26 is determined by a difference being ascertained between the two signals being sent to the amplifier 44. Should a difference exist between the desired and actual tension signals, the piston cylinder assembly 26 will be operated to reduce the difference to a desired value, such as, a zero value.
  • the potentiometer is designed to cause a progressive increase or decrease in the speed of the motors 54 of the mill stand 11.
  • the rate of change of speed as shown in FIG. 2, immediately beyond the midpoint of the working range of the looper arm is, at first, very gradual; but at the outer ends of the curve the rate of change of speed becomes very rapid, both at the acceleration and deceleration directions.
  • said means for adjusting the speed of the strip passing by said force exerting means includes means for producing an electrical signal of a nonlinear characteristic and further characterized in that the rate of change of the speed is gradual on adjacent sides of a selected working point in the working range of said force exerting means and very rapid on points further away from said adjacent sides of said selected working point.
  • An apparatus for controlling the tension in a strip passing between two stations comprising:
  • a second roller associated with said means for measuring the tension in the strip arranged to engage the strip
  • a third roller arranged between said first and second rollers adapted to engage the strip in a manner to cause the strip to deflect between said first and second rollers
  • a fourth roller arranged adjacent the first roller on the side furthest away from said third roller in a manner to engage the strip

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
  • Metal Rolling (AREA)
US00302687A 1972-01-21 1972-11-01 Method and apparatus for tensioning strip Expired - Lifetime US3788534A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB293472*[A GB1408573A (en) 1972-01-21 1972-01-21 Method and apparatus for tensioning strip

Publications (1)

Publication Number Publication Date
US3788534A true US3788534A (en) 1974-01-29

Family

ID=9748816

Family Applications (1)

Application Number Title Priority Date Filing Date
US00302687A Expired - Lifetime US3788534A (en) 1972-01-21 1972-11-01 Method and apparatus for tensioning strip

Country Status (11)

Country Link
US (1) US3788534A (enrdf_load_html_response)
JP (1) JPS5232036B2 (enrdf_load_html_response)
AU (1) AU5134773A (enrdf_load_html_response)
BE (1) BE794186A (enrdf_load_html_response)
CA (1) CA994454A (enrdf_load_html_response)
DE (1) DE2302472A1 (enrdf_load_html_response)
ES (1) ES410809A1 (enrdf_load_html_response)
FR (1) FR2168434B1 (enrdf_load_html_response)
GB (1) GB1408573A (enrdf_load_html_response)
IT (1) IT988103B (enrdf_load_html_response)
NL (1) NL7300753A (enrdf_load_html_response)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4004459A (en) * 1976-04-14 1977-01-25 Wean United, Inc. Combination strip contacting device for use in a rolling mill
US5310105A (en) * 1993-05-17 1994-05-10 Mills William D Stock material strip feed controller
US6427507B1 (en) * 1999-07-15 2002-08-06 Pohang Iron & Steel Co., Ltd. Apparatus for measuring the strip flatness
US6857301B1 (en) * 2002-10-16 2005-02-22 Machine Concepts, Inc. Displacement-type shape sensor for multi-roll leveler
CN102107221B (zh) * 2009-12-23 2012-10-10 宝山钢铁股份有限公司 一种带钢下表面测温仪及测温方法
US9459086B2 (en) 2014-02-17 2016-10-04 Machine Concepts, Inc. Shape sensor devices, shape error detection systems, and related shape sensing methods
EP3095532A1 (en) * 2015-05-18 2016-11-23 DANIELI & C. OFFICINE MECCANICHE S.p.A. Tensioning unit for rolling apparatuses
CN107695108A (zh) * 2017-09-28 2018-02-16 北京首钢自动化信息技术有限公司 一种提高轧制过程稳定性的张应力动态补偿方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52133062A (en) * 1976-04-30 1977-11-08 Ishikawajima Harima Heavy Ind Method of controlling looper in hot strip mill
JP2006198661A (ja) * 2005-01-21 2006-08-03 Nippon Steel Corp 冷間タンデム圧延機および冷間タンデム圧延方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3032245A (en) * 1960-04-25 1962-05-01 Gravure Res Inc Apparatus for controlling web tension
US3411684A (en) * 1965-07-12 1968-11-19 Seailles & Tison Sa Paying out under tension of products in sheet form,particularly paper sheet
US3485427A (en) * 1967-12-11 1969-12-23 Beloit Corp Tension controller
US3510036A (en) * 1968-03-29 1970-05-05 Bobst Champlain Inc Inserter and splicer with register control for a reprinted web
US3724733A (en) * 1972-02-03 1973-04-03 Harris Intertype Corp Web infeed mechanism

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1426009A (fr) * 1965-03-09 1966-01-24 Gen Dynamics Corp Dispositif de commande de tension mécanique

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3032245A (en) * 1960-04-25 1962-05-01 Gravure Res Inc Apparatus for controlling web tension
US3411684A (en) * 1965-07-12 1968-11-19 Seailles & Tison Sa Paying out under tension of products in sheet form,particularly paper sheet
US3485427A (en) * 1967-12-11 1969-12-23 Beloit Corp Tension controller
US3510036A (en) * 1968-03-29 1970-05-05 Bobst Champlain Inc Inserter and splicer with register control for a reprinted web
US3724733A (en) * 1972-02-03 1973-04-03 Harris Intertype Corp Web infeed mechanism

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4004459A (en) * 1976-04-14 1977-01-25 Wean United, Inc. Combination strip contacting device for use in a rolling mill
US5310105A (en) * 1993-05-17 1994-05-10 Mills William D Stock material strip feed controller
US6427507B1 (en) * 1999-07-15 2002-08-06 Pohang Iron & Steel Co., Ltd. Apparatus for measuring the strip flatness
US6857301B1 (en) * 2002-10-16 2005-02-22 Machine Concepts, Inc. Displacement-type shape sensor for multi-roll leveler
CN102107221B (zh) * 2009-12-23 2012-10-10 宝山钢铁股份有限公司 一种带钢下表面测温仪及测温方法
US9459086B2 (en) 2014-02-17 2016-10-04 Machine Concepts, Inc. Shape sensor devices, shape error detection systems, and related shape sensing methods
EP3095532A1 (en) * 2015-05-18 2016-11-23 DANIELI & C. OFFICINE MECCANICHE S.p.A. Tensioning unit for rolling apparatuses
CN107695108A (zh) * 2017-09-28 2018-02-16 北京首钢自动化信息技术有限公司 一种提高轧制过程稳定性的张应力动态补偿方法
CN107695108B (zh) * 2017-09-28 2019-03-01 北京首钢自动化信息技术有限公司 一种提高轧制过程稳定性的张应力动态补偿方法

Also Published As

Publication number Publication date
IT988103B (it) 1975-04-10
GB1408573A (en) 1975-10-01
ES410809A1 (es) 1975-12-16
AU5134773A (en) 1974-07-25
JPS4883059A (enrdf_load_html_response) 1973-11-06
FR2168434A1 (enrdf_load_html_response) 1973-08-31
JPS5232036B2 (enrdf_load_html_response) 1977-08-18
CA994454A (en) 1976-08-03
NL7300753A (enrdf_load_html_response) 1973-07-24
FR2168434B1 (enrdf_load_html_response) 1978-08-04
DE2302472A1 (de) 1973-07-26
BE794186A (fr) 1973-07-18

Similar Documents

Publication Publication Date Title
US3788534A (en) Method and apparatus for tensioning strip
US2332796A (en) Reduction of elongated bodies
EP0107493A3 (en) Rolling mill for metal strip
US4044580A (en) Rolling mill gap sensor
US2569264A (en) Strip tensioning apparatus
GB892058A (en) Improvements in or relating to rolling mills
US3172313A (en) Strip rolling apparatus
US3516273A (en) Strip thickness measuring device for use in a rolling mill and like apparatus
ES408244A1 (es) Mejoras introducidas en laminadoras.
GB1307823A (en) Rolling of strip or plate material
US2289410A (en) Method and apparatus for controlling alignment of mill rolls
US3290912A (en) Rolling mill control apparatus
US4003229A (en) Method for compensating tail end
US3613428A (en) Rolling mills
GB1450958A (en) Method of shape control for tandem rolling mill
US3587266A (en) Method and apparatus for rolling flat material in rolling mills or the like
US3401546A (en) Strip deflector means and control
GB1080842A (en) Method of and apparatus for obtaining flat metallic strip
US3744288A (en) Tensiometer
GB1243192A (en) Improvements in and relating to the rolling of strip
GB1316959A (en) Slab rolling
GB1113721A (en) Rolling mill or calender
US4004459A (en) Combination strip contacting device for use in a rolling mill
US3183693A (en) Control system for temper rolling mills
US2292535A (en) Strip rolling apparatus

Legal Events

Date Code Title Description
AS Assignment

Owner name: PITTSBURGH NATIONAL BANK

Free format text: SECURITY INTEREST;ASSIGNOR:WEAN UNITED, INC., A CORP.OF OH;REEL/FRAME:004458/0765

Effective date: 19850610

AS Assignment

Owner name: PITTSBURGH NATIONAL BANK,PENNSYLVANIA

Free format text: SECURITY INTEREST;ASSIGNOR:WEAN UNITED, INC., A CORP. OH.;REEL/FRAME:004792/0307

Effective date: 19860630

Owner name: PITTSBURGH NATIONAL BANK

Free format text: SECURITY INTEREST;ASSIGNOR:WEAN UNITED, INC., A CORP. OH.;REEL/FRAME:004792/0307

Effective date: 19860630

AS Assignment

Owner name: WEAN UNITED, INC.

Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:PITTSBURGH NATIONAL BANK;REEL/FRAME:004925/0218

Effective date: 19880509

AS Assignment

Owner name: UNITED ENGINEERING ROLLING MILLS, INC.

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:WEAN INCORPORATED;REEL/FRAME:004920/0256

Effective date: 19880610

AS Assignment

Owner name: UNITED ENGINEERING, INC.

Free format text: CHANGE OF NAME;ASSIGNOR:UNITED ENGINEERING ROLLING MILLS, INC.;REEL/FRAME:005285/0209

Effective date: 19900425