US3766761A - Rolling mill control - Google Patents
Rolling mill control Download PDFInfo
- Publication number
- US3766761A US3766761A US00187253A US3766761DA US3766761A US 3766761 A US3766761 A US 3766761A US 00187253 A US00187253 A US 00187253A US 3766761D A US3766761D A US 3766761DA US 3766761 A US3766761 A US 3766761A
- Authority
- US
- United States
- Prior art keywords
- mill
- signal
- stretch
- rolling
- roll gap
- 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
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
- B21B37/58—Roll-force control; Roll-gap control
- B21B37/64—Mill spring or roll spring compensation systems, e.g. control of prestressed mill stands
Definitions
- the initial roll setting or roll gap is selected before the product is received by the mill.
- This setting can be determined by a computer, from empirical data or from a calculated rolling schedule. Since, however, the rolling pressure does not bear a consistent relationship with the reduction necessary to yield the desired thickness, the initial setting of the roll opening may be and, actually, in many cases is incorrect. This usually is a result of using an incorrect estimate of the stretch of the mill for a desired thickness to be produced which results in an error in thickness of the workpiece being rolled.
- Such thickness errors are not generally compensated for by the gauge control system of the types noted above since these systems lock on to the initial rolling load (or mill stretch) at the front end of the product and are only concerned with compensating for changes in the stretch caused by a change in the rolling pressure during rolling, the object of which beingto produce uniform gauge along'the length of the product and only after the initial establishment of a rolling pressure.
- the thickness at the beginning of the lock on is governed by the rolling pressure at that time, which may be different than the conditions for which the roll gap was originally set. For example, locking on Over a chilled skid mark, a tapered front end, or a colder than normal portion would result in an erroneous mill stretch with reference to the mill stretch for normal reduction.
- It is a further object of the present invention to provide a control for a rolling mill having a roll gap including means for producing a first signal representing the required stretch of the mill relative to a desired thickness of product to be rolled, means for setting the initial no-load roll gap to equal .the desired thickness to be rolled less the required mill stretch to obtain that thickness, means for producing a second signal representing the actual stretch of the mill during rolling, means for producing a third signal derived from a comparison of said first and second signals and which represents the amount of error in the product thickness at the existing rolling pressure, and means for employing said third signal to change the roll gap to produce a product of said desired thickness.
- the piston cylinder assembly 27 is controlled by a servo-valve 29 which, in turn, is controlled by a gap control system set forth within the outline block identified as 31.
- the gap control system 31 follows the gap control system set forth in the aforesaid U.S. Patent No. 3,496,743. Very briefly, it includes in a simplified form an amplifier 32 that feeds a signal representing the amount of difference either betweenthe actual stretch and required or a change therebetween which is represented as AP/M in the drawing.
- the amplifier 32 produces a signal that operates the servo 29to move the cylinder 27b either up or down, depending on whether the correction to the roll gap requires an opening or closing thereof.
- this feedback signal is represented by a load cell signal, shown in the drawing as a Q signal, which is combined with a signal representing the modulus of a spring associated with the load cell to produce a signal Q/M, where I Q the force of the load cell M, the modulus of the spring.
- the signal from the position indicator 28, represented on the drawing as a Q value, is first sent to an amplifier 35 to produce a signal representing the initial, reading of the position indicator, as represented by a value Q lM, Once this signal is produced, it is held in a memory circuit 36 and employed as a reference value and compared with any change in the Q signal coming from the position indicator 28 as a result of a change in the rolling pressure of the mill.
- the signal coming from the position indicator 28 is sent also to an amplifier 37 to which there is fed a signal representing the modulus of the spring M, through a line 38 whereby the amplifier 37 produces a value representing Q/M, which is the actual stretch of the cell and spring system, which signal is sent to a summing amplifier 39 where the actual stretch of the spring and load cell is compared with the reference signal Q /M. to produce a signal representing the change in the stretch of the load cell and spring of the position indicator 28.
- This operation produces the feedback signal represented by AQ/M, which is fed to the summing amplifier 33.
- the stretch error signal of the mill as represented by a signal produced by the amplifier 32 and identified as AP/M is substracted from the signal AQ/M, until the difference equals zero.
- the signal Prepresenting the rolling load is also sent to a second subcontrolcircuit 48 which includes an amplifier 49 to whichis also fed an additional signal representing the modulus of the mill M through line 51, which may be adjustable to suit differentoperating mill conditions. Accordingly, the amplifier 49 produces a signal representing the actual stretch of the mill, which signal is sent from the amplifier 49 to the amplifier 32 where it is compared with the. initial signal of the stretch of the mill as produced by the circuit 41 and from which comparison there is produced the amount of change in the mill. stretch represented by a value AP/M the electrical signal representing this being produced and sent by the amplifier 32 'to the amplifier 33.
- the present invention eliminates altogether the circuit and function of the circuit41 and provides instead through a control unit 53 the generation of an electrical signal over a line 54 representing the required or predicted stretch of the mill for a desired thickness, which signal, as illustrated in the drawing, is sent to the summing amplifier 32 where it is compared with the actual stretch of the mill as produced by the amplifier 49.
- the generating signal representing the required mill stretch for a given thickness of product may be developed by a card system of the type well known in rolling mill practice, in which the data on the card being fed to a computer is arrived at through an empirical examination of previous rolling conditions with respect to the type, temperature, thickness, etc. of the product to be rolled.
- a signal representing the required mill stretch can also be produced continuously through a computer working in conjunction with known means for examiningthe various parameters that make up the stretch of the mill, which means can be associated with the mill in such a way as to examine the product while it is being rolled.
- the signal generated through the line 54 In addition to the signal generated through the line 54,
- control unit 53 sends a signal over line 55 to the po-' sition control 24 to set the initial no-load roll gap of the mill.
- the amount of no-load roll opening between the work rolls 11 and 12, as set by the control 24, will follow the equation:
- Thissignal from the amplifier 32 will'be characterized by either a positive or negative value 'so that the signal going to the servo 20 will effect an increase or decrease in the roll gap of the mill by an amount equal to the difference between the predicted and actual stretch of the mill caused by the change in the rolling pressure thereof.
- a control for a rolling mill for rolling to an absolute desired thickness from the earliest developed rolling pressure of said mill, said mill having a roll gap, and said control including means for producing prior to rolling a first signal representing an absolute selected anticipated value of the stretch of the mill for a selected reduction of a given rolled product,
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Metal Rolling (AREA)
Abstract
Description
Claims (3)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US18725371A | 1971-10-07 | 1971-10-07 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3766761A true US3766761A (en) | 1973-10-23 |
Family
ID=22688217
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00187253A Expired - Lifetime US3766761A (en) | 1971-10-07 | 1971-10-07 | Rolling mill control |
Country Status (12)
Country | Link |
---|---|
US (1) | US3766761A (en) |
JP (1) | JPS5223329B2 (en) |
AU (1) | AU476472B2 (en) |
BE (1) | BE789573A (en) |
BR (1) | BR7206831D0 (en) |
CA (1) | CA961952A (en) |
DE (1) | DE2246934A1 (en) |
ES (1) | ES407103A1 (en) |
FR (1) | FR2156062B1 (en) |
GB (1) | GB1346878A (en) |
IT (1) | IT966150B (en) |
NL (1) | NL7213039A (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3906764A (en) * | 1974-11-08 | 1975-09-23 | Bethlehem Steel Corp | Rolling mill control method and apparatus |
US4323971A (en) * | 1979-11-23 | 1982-04-06 | Kocks Technik Gmbh & Co. | Adjustment means for stretch reduction rolling mills |
US4415976A (en) * | 1981-04-28 | 1983-11-15 | Westinghouse Electric Corp. | Method and apparatus for automatic mill zero correction for strip width |
US4576027A (en) * | 1983-02-25 | 1986-03-18 | Mitsubishi Denki Kabushiki Kaisha | Rolling mill |
US4909060A (en) * | 1988-01-26 | 1990-03-20 | United Engineering, Inc. | Oil compression compensation system |
US20070241764A1 (en) * | 2006-04-13 | 2007-10-18 | Nitto Denko Corporation | Wired circuit board assembly sheet |
CN103394524A (en) * | 2013-07-30 | 2013-11-20 | 山西太钢不锈钢股份有限公司 | Thickness compensation rolling method |
CN114160582A (en) * | 2021-11-19 | 2022-03-11 | 太原理工大学 | Hydraulic vibration suppression device for vertical vibration of rolling mill |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5299957A (en) * | 1976-02-18 | 1977-08-22 | Tokyo Shibaura Electric Co | Device for controlling rolling machine |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3253438A (en) * | 1962-09-21 | 1966-05-31 | Westinghouse Electric Corp | Automatic strip gauge control for a rolling mill |
US3269160A (en) * | 1963-08-29 | 1966-08-30 | Allis Chalmers Mfg Co | Automatic gauge control with update |
US3496743A (en) * | 1966-09-09 | 1970-02-24 | United Eng Foundry Co | Rolling mill for producing constant gauge |
US3568637A (en) * | 1968-05-13 | 1971-03-09 | Westinghouse Electric Corp | Tandem mill force feed forward adaptive system |
US3574279A (en) * | 1970-01-08 | 1971-04-13 | Westinghouse Electric Corp | Predictive gauge control method and apparatus with automatic plasticity determination for metal rolling mills |
US3574280A (en) * | 1968-11-12 | 1971-04-13 | Westinghouse Electric Corp | Predictive gauge control method and apparatus with adaptive plasticity determination for metal rolling mills |
US3592030A (en) * | 1969-06-05 | 1971-07-13 | Westinghouse Electric Corp | Rolling mill stand screwdown position control |
US3625037A (en) * | 1969-02-25 | 1971-12-07 | Hunter Eng Co | Automatic gauge control system for a rolling mill |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1127926A (en) * | 1964-12-22 | 1968-09-18 | Davy & United Eng Co Ltd | Rolling mills |
-
0
- BE BE789573D patent/BE789573A/en unknown
-
1971
- 1971-10-07 US US00187253A patent/US3766761A/en not_active Expired - Lifetime
-
1972
- 1972-09-06 GB GB4139872A patent/GB1346878A/en not_active Expired
- 1972-09-07 AU AU46417/72A patent/AU476472B2/en not_active Expired
- 1972-09-13 CA CA151,552A patent/CA961952A/en not_active Expired
- 1972-09-25 DE DE19722246934 patent/DE2246934A1/en active Pending
- 1972-09-27 NL NL7213039A patent/NL7213039A/xx not_active Application Discontinuation
- 1972-09-28 ES ES407103A patent/ES407103A1/en not_active Expired
- 1972-10-02 BR BR6831/72A patent/BR7206831D0/en unknown
- 1972-10-02 IT IT53115/72A patent/IT966150B/en active
- 1972-10-05 FR FR7235293A patent/FR2156062B1/fr not_active Expired
- 1972-10-07 JP JP47101066A patent/JPS5223329B2/ja not_active Expired
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3253438A (en) * | 1962-09-21 | 1966-05-31 | Westinghouse Electric Corp | Automatic strip gauge control for a rolling mill |
US3269160A (en) * | 1963-08-29 | 1966-08-30 | Allis Chalmers Mfg Co | Automatic gauge control with update |
US3496743A (en) * | 1966-09-09 | 1970-02-24 | United Eng Foundry Co | Rolling mill for producing constant gauge |
US3568637A (en) * | 1968-05-13 | 1971-03-09 | Westinghouse Electric Corp | Tandem mill force feed forward adaptive system |
US3574280A (en) * | 1968-11-12 | 1971-04-13 | Westinghouse Electric Corp | Predictive gauge control method and apparatus with adaptive plasticity determination for metal rolling mills |
US3625037A (en) * | 1969-02-25 | 1971-12-07 | Hunter Eng Co | Automatic gauge control system for a rolling mill |
US3592030A (en) * | 1969-06-05 | 1971-07-13 | Westinghouse Electric Corp | Rolling mill stand screwdown position control |
US3574279A (en) * | 1970-01-08 | 1971-04-13 | Westinghouse Electric Corp | Predictive gauge control method and apparatus with automatic plasticity determination for metal rolling mills |
Cited By (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3906764A (en) * | 1974-11-08 | 1975-09-23 | Bethlehem Steel Corp | Rolling mill control method and apparatus |
US4323971A (en) * | 1979-11-23 | 1982-04-06 | Kocks Technik Gmbh & Co. | Adjustment means for stretch reduction rolling mills |
US4415976A (en) * | 1981-04-28 | 1983-11-15 | Westinghouse Electric Corp. | Method and apparatus for automatic mill zero correction for strip width |
US4576027A (en) * | 1983-02-25 | 1986-03-18 | Mitsubishi Denki Kabushiki Kaisha | Rolling mill |
US4909060A (en) * | 1988-01-26 | 1990-03-20 | United Engineering, Inc. | Oil compression compensation system |
US20070241764A1 (en) * | 2006-04-13 | 2007-10-18 | Nitto Denko Corporation | Wired circuit board assembly sheet |
US7592551B2 (en) * | 2006-04-13 | 2009-09-22 | Nitto Denko Corporation | Wired circuit board assembly sheet |
US20090260855A1 (en) * | 2006-04-13 | 2009-10-22 | Nitto Denko Corporation | Wired circuit board assembly sheet |
US20110139490A1 (en) * | 2006-04-13 | 2011-06-16 | Nitto Denko Corporation | Wired circuit board assembly sheet |
US20110155421A1 (en) * | 2006-04-13 | 2011-06-30 | Nitto Denko Corporation | Wired circuit board assembly sheet |
US8017871B2 (en) | 2006-04-13 | 2011-09-13 | Nitto Denko Corporation | Wired circuit board assembly sheet |
US8362360B2 (en) | 2006-04-13 | 2013-01-29 | Nitto Denko Corporation | Wired circuit board assembly sheet |
US8487189B2 (en) | 2006-04-13 | 2013-07-16 | Nitto Denko Corporation | Wired circuit board assembly sheet |
CN103394524A (en) * | 2013-07-30 | 2013-11-20 | 山西太钢不锈钢股份有限公司 | Thickness compensation rolling method |
CN103394524B (en) * | 2013-07-30 | 2016-01-27 | 山西太钢不锈钢股份有限公司 | A kind of thickness compensation milling method |
CN114160582A (en) * | 2021-11-19 | 2022-03-11 | 太原理工大学 | Hydraulic vibration suppression device for vertical vibration of rolling mill |
CN114160582B (en) * | 2021-11-19 | 2023-09-26 | 太原理工大学 | Hydraulic vibration suppression device for vertical vibration of rolling mill |
Also Published As
Publication number | Publication date |
---|---|
BE789573A (en) | 1973-03-29 |
AU4641772A (en) | 1974-03-14 |
NL7213039A (en) | 1973-04-10 |
CA961952A (en) | 1975-01-28 |
IT966150B (en) | 1974-02-11 |
GB1346878A (en) | 1974-02-13 |
BR7206831D0 (en) | 1973-09-13 |
DE2246934A1 (en) | 1973-04-19 |
ES407103A1 (en) | 1976-02-16 |
FR2156062B1 (en) | 1974-10-25 |
JPS5223329B2 (en) | 1977-06-23 |
JPS4845462A (en) | 1973-06-29 |
FR2156062A1 (en) | 1973-05-25 |
AU476472B2 (en) | 1976-09-23 |
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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 |