EP0044715A1 - Walzwerk - Google Patents

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Info

Publication number: EP0044715A1
Authority: EP; European Patent Office
Prior art keywords: roll; arbor; rolling mill; rolls; strip
Prior art date: 1980-07-17
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.): Ceased

Application number

EP19810303277

Other languages

English (en)

French (fr)

Inventor

Robert William Gronbech

Robert Marshall

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.)

Davy Mckee Sheffield Ltd

Original Assignee

Davy Mckee Sheffield Ltd

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.)

1980-07-17

Filing date

1981-07-16

Publication date

1982-01-27

1981-07-16 Application filed by Davy Mckee Sheffield Ltd filed Critical Davy Mckee Sheffield Ltd

1982-01-27 Publication of EP0044715A1 publication Critical patent/EP0044715A1/de

Status Ceased legal-status Critical Current

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Classifications

- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/02—Shape or construction of rolls
- B21B27/03—Sleeved rolls
- B21B27/05—Sleeved rolls with deflectable sleeves
- 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
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
- B21B37/30—Control of flatness or profile during rolling of strip, sheets or plates using roll camber control

Definitions

This invention relates to rolling mills particularly for rolling elongate metallic strip, such as steel strip.
Rolling mills for rolling down steel strip as supplied by a roughing mill are usually designed for maximum stiffness, and to that end have solid work rolls and massive back-up rolls intended to prevent bowing of the work rolls under the rolling load.
One consequence of that arrangement is that, when the entering strip has a non-uniform profile across its width, those parts having a greater thickness are subject to greater reduction than those parts of lesser thickness and are elongated in the length dimension of the strip to a greater degree. The result is bad shape, usually in the form of strip with "a full centre” or “full edges” and the strip is no longer flat.
Strip with good shape is generally preferred to strip with a good, or uniform profile, even if the former is associated with a slightly non-uniform profile. Ideally, the strip finally emerging from the rolling process should have both good shape and good profile.
compliance is introduced into a mill by having a roll or rolls, of hollow construction.
the compliant nature of the hollow roll or rolls is then such that the strip is subject to substantially uniform reduction across its width, regardless of its entering shape and its flatness does not deteriorate.
the stiffness or compliance of the hollow roll or rolls can be made to vary along the axial length of the roll or each roll so that bad shape in the incoming strip may be improved.
a mill should be stiff only over the width of the material being rolled; outside the confines of the strip width, the mill should be relatively compliant.
a mill having such a stiffness profile is believed to avoid the over-rolling of the edges of the material being rolled and to facilitate work roll bending designed to control cross-sectional shape of the rolled material.
the invention may be applied to a four-high mill, a five-high mill or a six-high mill.
one or both of the rolls can be hollow.
a hollow intermediate roll is interposed between one of the work rolls, and its back-up roll, while in a six-high mill having an intermediate roll between each work roll and its back-up roll one or both of the intermediate rolls may be hollow.
the mill of Figure 1 is represented by its rolls only, the mill housings and the drive being of well known form.
the mill is shown as having two work rolls 12 and 13, two back-up rolls 14 and 15, and an intermediate roll 16 between work roll 12 and its back-up roll 14.
Intermediate roll 16 is hollow as shown in order to introduce transverse compliance into the mill.
the softiness of the roll allows the roll to comply with variations of rolling load along its length due for example tq variations in thickness of the incoming work 17 across its width. As a consequence the work is reduced evenly across its width and the flatness of the work is not detrimentally affected.
the mill may have a second intermediate roll between the rolls 13 and 15; the second intermediate roll may be hollow, like roll 16, or solid.
the hollow roll 16 may have means causing the roll to have a compliance which varies along its length.
a roll with such means is illustrated in Figure 2A and 2B, where the means are constituted by a number of support discs 20 which are threaded on an arbor 21 and which are a close fit within the bore 22 of the roll 16; advantageously the discs 20 have an interference fit within the bore 22, but can be moved axially along the roll by expanding the roll by liquid under pressure.
the discs 20 are axially located according to the shape or flatness of the incoming work 17.
the support discs 20 are located centrally as shown in Figure 2A, so that the mill is stiffer in the centre than at the edges, the strip is given a greater reduction in the centre than at the edge parts, and the flatness is improved.
the incoming strip 17 exhibits centre buckle, i.e.
the discs are arranged as shown in Figure 2B to give the roll 16 a greater stiffness at the edges than at the centre; in Figure 2B, the discs 20 are separated so as to line up with the edges of the strip, the central part of .the roll being free of stiffening discs.
the second intermediate roll (not shown) need not have the same hollow construction as shown in Figures 2A and 2B, but if the rolls are similarly constructed the discs are similarly arranged when rolling strip with wavy edges or with a wavy centre.
both intermediate rolls should be hollow and provided with the support discs 20. Then, if the incoming strip has suffered greater elongation at the quarter points between the edges and the centre of the strip than elsewhere, the discs of one intermedite roll are positioned as in Figure 2A while those of the other intermediate roll are positioned as in Figure 2B. If the strip has been elongated less at the quarter points than elsewhere, the disc arrangement is the same, except that fewer discs are provided in the Figure 2A roll, with the consequence that the quarter points are given a smaller reduction than elsewhere.
the barrel of the intermediate roll or of each intermediate roll 16 has usually the same diameter over its length.
the barrel may be relieved as shown at 23 in Figures 2A and 2B, forming steps 24 aligned with the edges of the work. Stepped intermediate rolls reduce the over-rolling of the strip edges, particularly where work-roll bending is employed.
FIG 3 there are two intermediate rolls 30 and 31 . each of which is hollow and each of which is stiffened by an adjustable, close fitting, arbor 32 having tapered ends 33.
the arbors 32 are positioned so that the end of one lines up respectively with one edge of the strip 17, while the opposite end of the other arbor lines up with the other strip edge, as shown.
the mill is then relatively stiff over the width of the strip 17 and relatively soft outside the strip width. Over-rolling of the strip-edges is thus reduced and work-roll bending is facilitated.
Figure 4 shows a four-high mill with work rolls 35 and back-up rolls 36 and with each work roll constructed similarly to the intermediate rolls 30, 31 of Figure 3. Profile of the rolled strip is again controlled by work roll.bending.
each of the work roll 40, 41 of a four-high mill is hollow and contains an arbor 42.
the arbor 42 is an interference fit with the bore of its roll and extends over the central third of the length of the roll 40, 41.
the arbors are integral with shafts 43 of lesser diameter extending beyond the ends of the roll.
Hydraulic piston and cylinder assemblies are connected to the ends of the shafts 43 as represented by the forces F 4 - F 7 , to bend the arbors 42 and hence the centre parts of the rolls 40, 41. That bending equipment can replace or supplement the conventional work roll bending represented by the forces F l - F 3 and has the same function; however, the roll bending is concentrated at the roll centres which are normally subject to little bending when the bending forces are applied to the roll ends.
transverse rolling of the strip 17 can be varied as required.
the concept of a hollow roll with a central arbor can be applied to the intermediate roll 45 of a five-high mill ( Figure 6) or to each of the intermediate rolls of a six-high mill ( Figure 7) or to one or each of the back-up rolls ( Figures 8 and 9).
the axial length of the arbor 42 is less than the effective length of the roll barrel and may be less than the width of the strip 17.
Roll bending systems represented by the bending forces F 1 - F 7 are applied to the work rolls and to the intermediate roll 45 or intermediate rolls 46 and extends the influence of roll bending control across the full width of the strip.
each back-up roll 14, 15 is shown as. consisting of a sleeve 50 which is centrally stiffened by an arbor 51.
Arbor 51 has integral stub shafts 52 carried in bearings in the windows of the mill housing; the sleeves 50 themselves are unrestrained at their ends and remain isolated from much of the bending effect of the rolling load on the arbors 51.
the sleeves 50 tend to deflect in the opposite sense to the back-up rolls of normal four high mills, i.e. the outer ends of the upper sleeve 50 tend to deflect downwardly and the outer ends of lower sleeve 50 upwardly. Thereby, the total roll stack deflects or bowing is reduced relative to that of the rolls of a normal mill having solid back-up rolls.
the central arbor 51 is supplemented by adjustable spacer rings 55 carried on the shafts 52 and providing further local support for the sleeves 50.
the positions of rings 55 can be adjusted axially to influence the transverse deflections of the sleeves 50. It will be appreciated that this technique employs only the rolling load reaction force on the back-up bearing plates and does not require additional external forces, such as those applied in back-up roll bending, in order to influence the back-up bending deflections.
Figures 10 and 11 illustrate another form of stiffened hollow roll which, when used as the intermediate roll of a five-high mill has the properties of the six-high mill of Figure 3.
the work rolls of the mill are indicated at 112 and 113, the back-up rolls at 114 and 115, the intermediate roll at 116 between the upper work roll 112 and the upper back-up roll 114, and the metal strip to be rolled at 117.
the work rolls 112 and 113 have as before conventional roll bending equipment to control shape with, if required, a strip shape sensor downstream of the mill to control the work roll bending equipment.
the work roll bending equipment other means for control strip shape may be provided, such as thermal cambering of the rolls by the control of the cooling sprays along the length of the rolls.
the intermediate roll 116 has a barrel length greater than that of the other rolls of the mill.
the roll 116 is hollow having a bore 118 which has a uniform diameter over the greater part of its length from one end, but which has an enlarged diameter at 120 over the remainder of its length, a step 121 being formed where the diameter changes.
An arbor 122 having a length rather less than that of the work rolls is a close fit in that part of the bore 118 of smaller diameter, but is axially adjustable therein; thus the arbor may be an interference fit in the bore, adjustment being made possible by expanding the roll by liquid under pressure.
the arbor has a shank 123 by which it can be moved axially in the roll.
Intermediate roll 116 is itself axially adjustable relative to the other rolls, being mounted and driven for that purpose as described in British patent specification No. 1351074.
the arbor 122 may have shanks or spindles similar to 123 at both ends with those spindles carried in bearings which are mounted for axial adjustment.
the intermediate roll itself is not supported in bearings but is adjustable relative to its arbor.
the mill may be used for rolling strip of any width up to the maximum for which the mill is designed, the roll 116 and the arbor 122 being adjustable axially according to the width of the strip to be rolled.
roll 116 is adjusted to bring the step 121 into the same vertical plane as one edge of strip 117 and the arbor 122 is adjusted in roll 116 so that its shank end is in the same vertical plane as the other strip edge, the arbor 122 then overlying the strip width.
the mill has the required stiffness over only the strip width, but has greater compliance outside the strip width.
the greater compliance is achieved by termination of the stiffening arbor at the left hand strip edge and, at the right hand side, by the enlarged bore 120 which prevents the arbor stiffening the roll beyond the right hand strip edge.
the arbor 122 may be extended with a slight tapering at the left hand end to give a progressive increase in compliance.
the step 121 may be tapered.
the mill illustrated in Figures 10 and 11 has the advantage that only a single adjustable intermediate roll is required in order to adapt the mill to any strip width. Further, because the intermediate roll is longer than the
the roll has an arbor 212 formed at each end with a roll neck by which the roll is journalled in bearings in the roll housings (not shown). Over a central part 212A, the arbor has a constant diameter, but over each effective end of the arbor the diameter is reduced in small steps from the part 212A, as shown at 212B - 212G.
a sleeve 213 is carried on the arbor 212 and extends over the effective length of the latter.
the central part 213A of the sleeve is an interference fit with the central part of the arbor so that that part is permanently stiffly supported by the arbor.
the bore of the sleeve is rebated as shown at 214, the diameter of the rebated bore increasing in steps 214B - 214G from the central part 213A, to correspond approximately with the stepped parts 212B - 212G of the arbor.
a divergent, stepped, annular space is thus formed between the sleeve and the arbor at each end of the sleeve.
each wedge element 215 has an axial length corresponding to the length of an arbor step and a radial width slightly smaller than the spacing between the steps 212B and 214B.
the elements 215 are in that condition they provide no support for the sleeve, with the result that the roll is relatively stiff over the length of the central part 212A of the arbor, and relatively compliant over the ends.
the stiffened length of the roll is increased by means of an actuator 216 at each end of the arbor.
the actuator 216 applies axial forces to the end element 215G, and through it to the other elements 215F - 215B.
the effect of the application of the forces is to expand the wedge elements successively, starting with the element 215B which is restrained from axial movement; the number of elements so expanded depends on the magnitude of the forces applied by the actuator 216..
an element 215 is expanded against the contiguous faces of the arbor and sleeve, it provides stiffening support for the-sleeve, with the consequence that the stiffened length of roll can be increased by a given axial length dependent on the force of the actuator 216.
the elements 215 may have any desired form capable of producing the necessary radial expansion when subject to axial forces.
the element may consist of two rings, one within the other and with tapered faces in contact with one another. It is however preferred to employ elements made and sold under the trade name "RINGFEDER", comprising three concentric rings of which the central ring is actuated directly or indirectly by the actuator 216 and has wedge faces engaging complementary faces on the other rings.
the central stiffened part of the sleeve 213A may have a length slightly less than the minimum width of strip to be rolled, while the overall axial length of the sleeve 213 is slightly greater than the maximum width of strip that can be rolled on the mill.
the forces applied by the two actuators 216, and.hence the stiffened length of the roll, are chosen according to the strip width to be rolled.
a roll as described may be employed for one or each of the rolls of a four-high mill; as the intermediate roll of a five-high mill; or as one or each of the intermediate rolls of a six-high mill.
the roll has a central bore in which is located an axially adjustable arbor.
the roll should have a life comparable with the life of a conventional solid roll.
the possible turn-down of a hollow roll is clearly limited relative to that of a solid roll and furthermore a given turn-down of a hollow roll gives a larger change in roll compliance than in the case of a solid roll.
the roll illustrated in Figure 13 avoids many gf those difficulties.
the roll comprises a sleeve 262 which constitutes the roll barrel and an arbor 263 received within the sleeve with a clearance fit and having a length substantially less than that of the sleeve.
the arbor 263 is secured to a relatively narrow actuating rod 264 extending beyond the sleeve end.
end members 265 and 266 are secured in the sleeve ends, as by Bratt mounting, those members having spigot parts 265A and 266A for that purpose.
Each end member is integral with a roll neck 267 or 268 by which the roll is journalled in the mill.
the end member 266 with its integral roll neck 268 has a bore 270 to receive the rod 264.
the bore within the roll neck 268 is enlarged at 271 and receives a piston 272, which is secured on a reduced part of 264A of the rod 264, and an end plug 273.
the rod 264 has passages 274 by which liquid under pressure can be supplied to opposite ends of the enlarged bore 268 to cause the piston 272, and with it the arbor 263, to be moved in either direction. Further passages lead through the arbor to transverse ducts supplying lubricant between the arbor and the sleeve bore, while the end member 265 and roll neck 267 have a passge 275 for oil discharge.
the roll may be used in a four-high, a five-high, or a six-high mill configuration, for example in place of the hollow roll 16, 30, 35, 40, 45 or 46 of Figures 1 to 9.
the available axial adjustment of the arbor 13 within the sleeve 12 is limited, it is advantageous to use two rolls having arbors of different axial length. Between them, the two rolls are then able to be accommodated to all widths of strip or other workpiece likely to be encounterd in the operation of the mill.
a shape'detector preferably that known under the name VIDIMON, downstream of the mill may be used in conjunction with a closed loop control scheme to vary automatically the position of the arbor within the sleeve for shape control.
the arbor should be an interference fit within the sleeve and, indeed, such a fit should be avoided for ease of adjustment. Instead, there should be clearance between the arbor and the bore of the sleeve when the roll is not in use; under the rolling load, the barrel then deflects on to the arbor and the rolling load is taken in part by the sleeve and in part by the arbor.
the construction illustrated in Figure 13 reduces the difficulties referred to above. It not only removes the conflict between the desired compliance of the barrel and the need for strength in the roll necks, but obviates the necessity of boring out a hardened solid roll; the sleeve can be cast in hard, wear-resisting metal, or it can be formed by boring out a cylinder and subsequently hardened by heat-treatment.
the life of the roll is no longer determined by the amount of turn-down that is available, since it is relatively cheap and easy to fit a new sleeve to the end members and roll necks when wear occurs. Excessive changes in compliance of the sleeve is thereby avoided.

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Engineering & Computer Science (AREA)
Mechanical Engineering (AREA)
Physics & Mathematics (AREA)
Geometry (AREA)
Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)

EP19810303277 1980-07-17 1981-07-16 Walzwerk Ceased EP0044715A1 (de)

Applications Claiming Priority (8)

Application Number	Priority Date	Filing Date	Title
GB8023335		1980-07-17
GB8023335		1980-07-17
GB8030666		1980-09-23
GB8030666		1980-09-23
GB8036178		1980-11-11
GB8036178		1980-11-11
GB8108859		1981-03-20
GB8108859		1981-03-20

Publications (1)

Publication Number	Publication Date
EP0044715A1 true EP0044715A1 (de)	1982-01-27

Family

ID=27449192

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP19810303277 Ceased EP0044715A1 (de)	1980-07-17	1981-07-16	Walzwerk

Country Status (1)

Country	Link
EP (1)	EP0044715A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
EP0086934A1 (de) *	1982-02-24	1983-08-31	Sms Schloemann-Siemag Aktiengesellschaft	Verfahren und Walzgerüst zum Auswalzen von Bandmaterial unterschiedlicher Breite
US6705238B1 (en)	1999-05-08	2004-03-16	Heckert Gmbh	Scissors-type lifting table

Citations (6)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE119885C (de) *	1900-03-10
FR958248A (de) *		1950-03-06
DE2314502A1 (de) *	1973-03-23	1974-09-26	Reining Gmbh Heinrich	Verfahren zum herstellen metallischer verbundwalzen fuer die verformung von blechen, brammen, knueppeln, platinen, profilen oder dgl. und nach diesem verfahren hergestellte verbundwalze
CH593724A5 (en) *	1975-07-10	1977-12-15	Escher Wyss Ag	Flexure compensation roll for rolling mills - where angle of hydraulic flexure compensation elements can be varied
DE2624876A1 (de) *	1976-06-03	1977-12-15	Schloemann Siemag Ag	Walzgeruest fuer bleche und baender
JPH10305876A (ja) *	1997-05-01	1998-11-17	Asahi Chem Ind Co Ltd	パラ系アラミドフィルムロール

1981
- 1981-07-16 EP EP19810303277 patent/EP0044715A1/de not_active Ceased

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
FR958248A (de) *		1950-03-06
DE119885C (de) *	1900-03-10
DE2314502A1 (de) *	1973-03-23	1974-09-26	Reining Gmbh Heinrich	Verfahren zum herstellen metallischer verbundwalzen fuer die verformung von blechen, brammen, knueppeln, platinen, profilen oder dgl. und nach diesem verfahren hergestellte verbundwalze
CH593724A5 (en) *	1975-07-10	1977-12-15	Escher Wyss Ag	Flexure compensation roll for rolling mills - where angle of hydraulic flexure compensation elements can be varied
DE2624876A1 (de) *	1976-06-03	1977-12-15	Schloemann Siemag Ag	Walzgeruest fuer bleche und baender
JPH10305876A (ja) *	1997-05-01	1998-11-17	Asahi Chem Ind Co Ltd	パラ系アラミドフィルムロール

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
EP0086934A1 (de) *	1982-02-24	1983-08-31	Sms Schloemann-Siemag Aktiengesellschaft	Verfahren und Walzgerüst zum Auswalzen von Bandmaterial unterschiedlicher Breite
US4479374A (en) *	1982-02-24	1984-10-30	Sms Schloemann-Siemag Ag	Strip-rolling method and apparatus
US6705238B1 (en)	1999-05-08	2004-03-16	Heckert Gmbh	Scissors-type lifting table

Legal Events

Date	Code	Title	Description
1981-11-27	PUAI	Public reference made under article 153(3) epc to a published international application that has entered the european phase	Free format text: ORIGINAL CODE: 0009012
1982-01-27	AK	Designated contracting states	Designated state(s): AT BE CH DE FR GB IT LI LU NL SE
1982-07-14	17P	Request for examination filed	Effective date: 19820503
1983-05-25	RAP1	Party data changed (applicant data changed or rights of an application transferred)	Owner name: DAVY MCKEE (SHEFFIELD) LIMITED
1985-01-23	STAA	Information on the status of an ep patent application or granted ep patent	Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED
1985-03-27	18R	Application refused	Effective date: 19841012
2007-08-08	RIN1	Information on inventor provided before grant (corrected)	Inventor name: MARSHALL, ROBERT Inventor name: GRONBECH, ROBERT WILLIAM

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