US3852984A - Coarse and vernier roll position system for a rolling mill - Google Patents
Coarse and vernier roll position system for a rolling mill Download PDFInfo
- Publication number
- US3852984A US3852984A US00448584A US44858474A US3852984A US 3852984 A US3852984 A US 3852984A US 00448584 A US00448584 A US 00448584A US 44858474 A US44858474 A US 44858474A US 3852984 A US3852984 A US 3852984A
- Authority
- US
- United States
- Prior art keywords
- piston cylinder
- cylinder assembly
- roll
- piston
- rolling mill
- 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
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
- B21B38/10—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring roll-gap, e.g. pass indicators
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
- B21B31/16—Adjusting or positioning rolls
- B21B31/20—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis
- B21B31/32—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis by liquid pressure, e.g. hydromechanical adjusting
Definitions
- ABSTRACT The present disclosure relates to a rolling mill having an hydraulic piston cylinder assembly for adjusting the COARSE AND VERNIER ROLL POSITION SYSTEM FOR A ROLLING MILL lnventor: Joseph Irwin Greenberger, Pittsburgh, Pa.
- mills of the type being discussed provide some way of adjusting the bottom pair of rolls, if the mill is a four-high mill.
- this adjustment for passline has been done in some mills by operating the roll positioning hydraulic piston cylinder assemblies. Examples oftwo such designs are found in U.S. Pat. Nos. 3,7l3,314 and 3,757,553.
- mechanical means for repositioning the roll position indicating devices to maintain them in their narrow working ranges after the passline has been adjusted for example, after the lower back-up and/or work rolls have been changed which have significant differences in diameters than the previous lower rolls removed from the mill.
- the present invention provides a simple, inexpensive, and trouble-free system for controlling the operation of long stroke roll positioning hydraulic piston cylinder assemblies of a mill for roll passline adjustment and for the roll gap control thereof.
- the present invention provides a coarse position transducer arranged to measure the large relative movement of the piston end cylinder of each piston'cylinder assembly for passline adjustment ofthe lower work roll and a vernier position transducer for measuring the relative small movement of the piston end cylinder of each piston cylinder assembly for adjustment of the lower work roll for a gauge control, including means for selectively bringing into operation one or the other of the different transducers depending on which operation the mill is performing.
- FIG. 1 is a partial, sectional elevational view of the bottom portion ofa four-high rolling mill incorporating the features of the present invention
- FIG. 2 is an enlarged elevational view of a portion of FIG. 1 illustrating the clamping device
- FIG. 3 is a sectional view taken on line 3-3 of FIG. 2, and
- FIG. 4 is a sectional view taken on line 44 of FIG. 2.
- FIG. 1 it will be appreciated that the portion of the rolling mill not illustrated in the drawings follows well-known mill construction as can be seen from the aforesaid US. Pat. No. 3,757,553, in which the similarities of many of the parts shown in FIG. 1 of the present disclosure will be readily recognized, such as, for example, the construction of the lower part of the mill housing, the roll changing rails, and the roll positioning piston cylinder assembly.
- FIG. 1 is designated at 10, its window at 12, and its back-up I roll bearing chock at 14 and the roll positioning piston cylinder assembly at 16.
- the other housing assembly that makes up the mill stand is constructed similar to the one illustrated in FIG. 1.
- FIG. 1 also illustrates the rails 18 employed to change the back-up rolls of the mill.
- the relatively long stroke roll positioning piston cylinder assembly 16 having say an 8 inch stroke
- its cylinder 20 is inverted having its upper surface engageable with the bottom surface of the back-up bearing chock 14 through filler plates 22.
- the piston 24 of the piston cylinder assembly 16 is stationarily mounted within the window 12 of the housing.
- the piston cylinder assembly is designed to exert its entire force to lift the cylinder 20 upwardly.
- a pair of small piston cylinder assemblies 26 are provided being connected to the bottom of the cylinder 20 having their pistons 28 engageable with the bottom surface of the stationary piston 24 of the piston cylinder assembly 16.
- FIG. 1 illustrates the use of two separate pairs of position transducers, one pair for controlling a coarse adjustment of the piston cylinder assembly 16 arranged in a diametrically opposite manner and the other pair for controlling a vernier adjustment thereof similarly arranged.
- legends have been provided indicating in somewhat exaggerated form the ranges of required coarse adjustment and vernier adjustment by the words passline range and roll gap gauge control range, respectively.
- the passline range can be of the order of 8 inches, whereas the roll gap range will be of the order 0.40 inch.
- the coarse adjustment transducers one of which is designated at 32 in FIG. 1, in which its housing 34 is secured to the adjacent surface of the cylinder 20 for movement therewith, the stem 36 of the transducer 32 is held stationary by a spring 38 located at the bottom of the assembly, the spring being received in a cap 42 secured to a bottom plate 44.
- the entire assembly is enclosed by a protective cover 46 which includes a bellows.
- LVDT linear variable differential transformer
- the movement of the piston cylinder assembly 16 will be controlled to position the lower work roll at a desired passline elevation.
- this unit also is an LVDT similar to the unit 32, but of a type 200 MP having a range of 0.40 inch and a resolution of approximately 0.0002 inch to 0.0004 inch, manufactured and sold by the aforesaid Schaevitz Engineering.
- the housing 52 of the transducer 50 is stationarily mounted to the plate 44 through a housing 54.
- the stem 56 of the transducer 50 extends from below the housing 52 where it is biased in opposite directions by two springs 58 and 60 to the lower part of the cylinder 20.
- the stem 56 passes through a clamping device 62 employed to selectively secure the stem 56 to the cylinder for movement therewith.
- a clamping device 62 is best shown in FIGS. 2, 3, and 4. It comprises a U-shaped spring having two leaf spring arms 64 and 66 having their base secured to a vertical plate 68 which is connected in turn to the adjacent wall of the cylinder 20.
- the spring arms 64 and 66 have gripper elements 70 and 72 which are urged tightly against the stem 56 by the agency ofa spring 74 carried by a bolt 76.
- the free ends of the leaf spring arms 64 and 66 are provided with vertical wedges 78 and 80, the taper surfaces of which at identical points are engaged by a pair of rollers 82 and 84, respectively,
- the rollers are moved vertically against the wedges by a piston cylinder assembly 86 so that in the position shown in FIGS. 3 and 4, the rollers are in their lowest positions and the spring 74 has urged the gripper elements 70 and 72 into contact with the stem 56 of the transducer 50.
- the gripper elements 70 and 72 are forced apart to allow movement of the cylinder 20 relative to the stem 56.
- the control With the transducers 50 inoperative and their signal interrupted by an electrical operation of the main control, the control will activate the coarse transducers 32 so that they will measure the movement of the piston cylinder assembly 16.
- the piston cylinder assembly 16 will move the lower rolls upwardly, which movement will be measured by the coarse transducers 32 and from which measurement the piston cylinder assemblys operation will be interrupted when the transducer signals indicate that the rolls have been moved the required 4 inches. Since the passline position of the rolls is not extremely critical, the coarse and relatively the long main control and the vernier transducers 50 are rendered operational by a similar electrical operation.
- the piston cylinder assemblies 86 are operated to lower the rollers 82 and 84 to free the springs 64 and 66 and cause the stems 56 of the transducers 50 to be automatically gripped by the elements 70 and 72.
- the particular use of the piston cylinder assemblies 86 and the springs 74 assure that should a power failure occur to the piston cylinder assemblies 86 it will not affect the tie-in selectively established between the cylinder 20 and the stems 56 which rely totally on the force of the springs 74. Once these operations have been performed the mill will be ready to receive the material to be rolled.
- the actual gap control system employed with the vernier transducers 50 may vary in form, the arrangement shown being intended to work with a system that measures the stretch of the mill as a function of the rolling pressure and produces a signal of the mill stretch which becomes at least a part of a gauge error or corrective signal used to control the operation of the piston cylinder assembly 16 to correct for the error and, hence, the change in gauge of the product being rolled.
- the vernier transducers will measure the movement of the cylinder 20 very accurately within its relatively narrow range and produce a signal representative thereof, which will be compared with the error signal until the error signal has been corrected.
- a gauge control system of this general type is more fully explained and illustrated in US. Pat. No. 3,496,743, that issued to M. D. Stone on Feb. 24, 1970.
- the transducers 32 are ren- 'dered inoperative by an electrical operation of the working position and then positioning said roll in a vernier manner
- said first means comprises an electrical position transducer having a relatively wide range of measurement and relatively coarse resolution
- said second means comprising an electrical position transducer having a relatively narrow range of measurement and relatively fine resolution
- said coarse position transducer comprises a linear variable differential transformer having a wide range of the order of 8 inches and a resolution of the order of approximately 0.005 inch to 0.010 inch, and
- said fine position transducer comprises a linear variable differential transformer having a narrow range of the order of 0.40 inch and a resolution of the order of approximately 0.0002 to 0.0004 inch.
- yieldable means associated with said movable stem member for maintaining said movable stem member in a preselected position relative to a nonmoving part of said fine measuring transducer.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Metal Rolling (AREA)
Abstract
Description
Claims (8)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00448584A US3852984A (en) | 1974-03-06 | 1974-03-06 | Coarse and vernier roll position system for a rolling mill |
CA213,012A CA1009068A (en) | 1974-03-06 | 1974-11-05 | Coarse and vernier roll position system for a rolling mill |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00448584A US3852984A (en) | 1974-03-06 | 1974-03-06 | Coarse and vernier roll position system for a rolling mill |
Publications (1)
Publication Number | Publication Date |
---|---|
US3852984A true US3852984A (en) | 1974-12-10 |
Family
ID=23780890
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00448584A Expired - Lifetime US3852984A (en) | 1974-03-06 | 1974-03-06 | Coarse and vernier roll position system for a rolling mill |
Country Status (2)
Country | Link |
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US (1) | US3852984A (en) |
CA (1) | CA1009068A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4458514A (en) * | 1982-03-03 | 1984-07-10 | Davy Mckee (Sheffield) Limited | Position control of piston-cylinder device |
EP0163247A2 (en) * | 1984-06-01 | 1985-12-04 | MANNESMANN Aktiengesellschaft | Indicating device for roll adjusting |
DE3939124A1 (en) * | 1989-11-25 | 1991-05-29 | Sundwiger Eisen Maschinen | MULTI-ROLLER ROD WITH HYDRAULIC EMPLOYMENT |
US6170312B1 (en) * | 1999-04-16 | 2001-01-09 | Vai Clecim | Hydraulic load capsule for a metal working rolling mill |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3486360A (en) * | 1967-01-02 | 1969-12-30 | Davy & United Eng Co Ltd | Adjustment unit |
US3516273A (en) * | 1966-08-16 | 1970-06-23 | United Eng Foundry Co | Strip thickness measuring device for use in a rolling mill and like apparatus |
US3736782A (en) * | 1969-10-22 | 1973-06-05 | Hitachi Ltd | Thrusting devices for rolling mills |
-
1974
- 1974-03-06 US US00448584A patent/US3852984A/en not_active Expired - Lifetime
- 1974-11-05 CA CA213,012A patent/CA1009068A/en not_active Expired
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3516273A (en) * | 1966-08-16 | 1970-06-23 | United Eng Foundry Co | Strip thickness measuring device for use in a rolling mill and like apparatus |
US3486360A (en) * | 1967-01-02 | 1969-12-30 | Davy & United Eng Co Ltd | Adjustment unit |
US3736782A (en) * | 1969-10-22 | 1973-06-05 | Hitachi Ltd | Thrusting devices for rolling mills |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4458514A (en) * | 1982-03-03 | 1984-07-10 | Davy Mckee (Sheffield) Limited | Position control of piston-cylinder device |
EP0163247A2 (en) * | 1984-06-01 | 1985-12-04 | MANNESMANN Aktiengesellschaft | Indicating device for roll adjusting |
EP0163247A3 (en) * | 1984-06-01 | 1986-07-23 | MANNESMANN Aktiengesellschaft | Indicating device for roll adjusting |
DE3939124A1 (en) * | 1989-11-25 | 1991-05-29 | Sundwiger Eisen Maschinen | MULTI-ROLLER ROD WITH HYDRAULIC EMPLOYMENT |
US5142896A (en) * | 1989-11-25 | 1992-09-01 | Sundwiger Eisenhutte Maschinenfabrik | Cluster mill with hydraulic screw-down |
US6170312B1 (en) * | 1999-04-16 | 2001-01-09 | Vai Clecim | Hydraulic load capsule for a metal working rolling mill |
Also Published As
Publication number | Publication date |
---|---|
CA1009068A (en) | 1977-04-26 |
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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 Free format text: SECURITY INTEREST;ASSIGNOR:WEAN UNITED, INC., A CORP. OH.;REEL/FRAME:004792/0307 Effective date: 19860630 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 |
|
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 |