EP0032766A1 - Method of rolling a length of metal bar or wire and apparatus for carrying out the method - Google Patents

Method of rolling a length of metal bar or wire and apparatus for carrying out the method Download PDF

Info

Publication number
EP0032766A1
EP0032766A1 EP81200028A EP81200028A EP0032766A1 EP 0032766 A1 EP0032766 A1 EP 0032766A1 EP 81200028 A EP81200028 A EP 81200028A EP 81200028 A EP81200028 A EP 81200028A EP 0032766 A1 EP0032766 A1 EP 0032766A1
Authority
EP
European Patent Office
Prior art keywords
bridle rolls
length
metal length
metal
rolls
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.)
Granted
Application number
EP81200028A
Other languages
German (de)
French (fr)
Other versions
EP0032766B1 (en
Inventor
Florimond Ferket
Cornelis Anthonius Kuenen
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.)
Tata Steel Ijmuiden BV
Original Assignee
Hoogovens Groep BV
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 Hoogovens Groep BV filed Critical Hoogovens Groep BV
Priority to AT81200028T priority Critical patent/ATE6913T1/en
Publication of EP0032766A1 publication Critical patent/EP0032766A1/en
Application granted granted Critical
Publication of EP0032766B1 publication Critical patent/EP0032766B1/en
Expired 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
    • B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B39/006—Pinch roll sets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-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
    • B21B1/16—Metal-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 wire rods, bars, merchant bars, rounds wire or material of like small cross-section
    • B21B1/18—Metal-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 wire rods, bars, merchant bars, rounds wire or material of like small cross-section in a continuous process
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B33/00—Safety devices not otherwise provided for; Breaker blocks; Devices for freeing jammed rolls for handling cobbles; Overload safety devices
    • B21B2033/005—Cobble-freeing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2273/00—Path parameters
    • B21B2273/06—Threading
    • B21B2273/08—Threading-in or before threading-in
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B39/02—Feeding or supporting work; Braking or tensioning arrangements, e.g. threading arrangements
    • B21B39/08—Braking or tensioning arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/0224—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for wire, rods, rounds, bars

Definitions

  • This invention relates to a method of rolling a length of metal bar or wire, especially hot-rolled bar or wire, and is particularly concerned with the steps necessary to keep such a metal length stretched at the end of rolling when it passes through a cooling device after the final roll stand.
  • the invention also relates to apparatus for carrying out the method.
  • the metal length will generally be called a bar in the following description, but is not limited thereto.
  • the object of the present invention is to avoid this disadvantage.
  • the power input to the bridle rolls is temporarily increased, so that, immediately before entry of the bar into the bridle rolls, their peripheral speed is greater than the peripheral speed corresponding to the normal power input used during passage of the bar.
  • the power input is briefly increased as the leading end of the bar approaches, so that the bridle rolls are rotating at the higher speed at the moment of entry.
  • the power input is reduced to the level used while the bar is passing. It appears that the extra peripheral speed of the bridle rolls causes a considerably greater tensile force on the bar as the bar begins to pass through them, and this greater force virtually eliminates twisting or buckling of the head of the bar.
  • the bridle rolls are driven independently by permanently fitted motors by means of Cardan shafts, but a single drive to the two rolls is possible.
  • the gap between the bridle rolls before entry of the bar should preferably be about 2 mm smaller than the thickness of the bar concerned.
  • the bridle rolls Rl and R2 are driven independently through Cardan shafts CD1 and CD2 by permanently fitted electric motors Ml and M2, which are supplied from a static frequency convertor ST.
  • the motors Ml and M2 are squirrel-cage rotor motors rated at 3.75 kVA each and the static frequency convertor has an output of 15 kVA with a yield of 90%.
  • the convertor ST receives signals from a photo electric cell F which detects the presence of the hot bar material in the mill train before the finishing stand W, the cell being located above the mill train before the stand W.
  • the convertor also receives signals from a tachogenerator TG which determines the finishing rolling speed, being linked to the finishing stand W. Data are also entered, indicated by R in Fig. 1 relating to the diameter correlation and the drawing adjustment for the bar being rolled.
  • Fig. 1 shows, highly diagrammatically, that the upper bridle roll Rl is fixed while the bottom bridle roll R2 is movable since the frame in which the roll R2 is fitted can swing round a pivot located "upstream" with respect to the bar travel.
  • An adjustable stop A determines the minimum gap between the two rolls Rl and R2. This gap is set at about 2 mm less than the thickness or diameter of the bar to be drawn.
  • An air cylinder C supplied from a compressed air network through a reducing valve V, normally presses the frame in which the roll R2 is fitted against the stop A (whose position is adjustable by means of a screw spindle). As soon as the bar arrives between the rolls Rl and R2, the frame leaves the stop and the air cylinder C ensures that the bar is spring gripped between the two rolls.
  • the gripping surface of the two rolls is profiled, e.g. by applying a pattern of recesses or holes and then hardened.
  • the top roll Rl can be placed in the correct position in the rolling line by adjusting the frame carrying it.
  • Fig. 2 shows how a temporary accumulation of energy can be used to keep the bar stretched when entering the bridle rolls.
  • Time is indicated along the horizontal axis.
  • the rotational speed n(rpm) of the bridle rolls is given on the vertical axis
  • the control signal to the bridle roll motors is shown on the vertical axis. This control signal indicates the period of time for which a higher power input is applied. Power input can be accurately controlled by means of the static frequency convertor ST, using frequency control of the motors.
  • Fig. 2 thus shows that there is a temporary increase in the power input over a time period t s which leads (see the upper graph) to an acceleration of the bridle rolls to a higher speed, this acceleration occurring over a time period of t.
  • the initial speed of the bridle rolls (given as 800 rpm in this example) is the idling speed of the rolls at the normal power input which is used when the bar is actually passing; this idling speed is 5 to 10% higher than the actual rolling speed of the bar.
  • the bridle rolls must of course run at a peripheral speed equal to the rolling speed of the final roll stand W, as indicated by the slightly lower speed (e.g. 760 rpm) at the right hand side of Fig. 2.
  • the power input to the bridle roll motors is increased, leading to a rise in speed of about 25% in this case (to about 1000 rpm).
  • This rise is synchronised so that the leading end of the bar arrives after the higher speed is reached.
  • the moment of arrival of the bar corresponds with the end of the time period t and is followed by the decline in speed to the level corresponding to the final rolling speed. It is this initial tension applied to the bar which minimises the damage to the head of the bar. This leads to a considerable reduction in wastage of material.
  • a 25% increase in speed is indicated above (to 1000 from 800). Suitably, this increase is in the range 15% to 35%.
  • the time t s during which the control signal is present is not fixed, nor is the time t v over which the rotating parts are speeded up. Both depend on, inter alia the speed of the bar material.
  • the time t s is adjusted in dependence on the roll speed (via TG) automatically in ST.
  • the photo-electric cell F is located at a distance of about 7 metres from the bridle rolls Rl, R2, and the speed of the bar is about 14 metres per second, 0.5 seconds is available to increase the speed.
  • the head of the bar On entering the rolls Rl,R2, the head of the bar will be subjected to a considerable tensile force between the rolls owing to the difference in the speed between these rolls and the stand W, so that the head of the bar will remain straight.
  • the gap between the rolls at the time of entry of the bar is about 2 mm less than the diameter of the bar, there is less slip on entry between the bridle rolls and the bar material, so that there is an additional advantage that the bridle rolls last longer.

Abstract

At the end of a hot-rolling train a metal length (WS) (bar or wire) is passed through a final roll stand (W) and then through a cooling device (K). To keep the length under tension in the cooling device (K), it is pulled frictionally by an opposed pair of bridle rolls (R1, R2) which are driven, while the length is passing, with a power input which would in the absence of the length, be sufficient to cause a peripheral speed of the bridle rolls (R1, R2) slightly higher than the rolling speed of the length. To prevent the leading end of the metal length being twisted or otherwise damaged on entry into the bridle rolls, the bridle rolls (R1, R2) are driven at a slightly higher peripheral speed immediately prior to the entry of the metal length.

Description

  • This invention relates to a method of rolling a length of metal bar or wire, especially hot-rolled bar or wire, and is particularly concerned with the steps necessary to keep such a metal length stretched at the end of rolling when it passes through a cooling device after the final roll stand. The invention also relates to apparatus for carrying out the method. For ease of description, the metal length will generally be called a bar in the following description, but is not limited thereto.
  • It is known to keep a "continuous" metal bar or wire, which is passing through a finishing roll stand and subsequently through a cooling device, stretched by means of a set of bridle rolls (also known as pinch rolls) located after the cooling device, between which the bar is frictionally gripped. Typically the bridle rolls are driven by independent identical motors with a rated peripheral velocity exceeding the finishing rolling speed of the bar. See Dutch patent 154129, which discloses use of an adjustable parallelogram-shaped yoke in a plane at right angles to the passage of the bar, the yoke being supported by two fixed pivots above and below the rolls. The rolls turn in bearings in the upstanding sides of the parallelogram-shaped yoke. The motors are fitted in the said upstanding sides.
  • In practice, it has been found that, possibly owing to the large inertial mass involved, the first part of the bar becomes twisted or buckled in the cooling device. This is apparently caused by some difficulty of entry of the leading end of the bar into the bridle rolls, or some slippage in the grip of the bridle rolls, and occurs notwithstanding the slightly higher speed of the bridle rolls at entry of the bar. This higher speed arises from the power input to the motors of the rolls which is selected so that the rolls exert a drawing on the bar to keep it under tension. Bar ends damaged in this way have to be scrapped, which is costly.
  • The object of the present invention is to avoid this disadvantage.
  • According to the invention, the power input to the bridle rolls is temporarily increased, so that, immediately before entry of the bar into the bridle rolls, their peripheral speed is greater than the peripheral speed corresponding to the normal power input used during passage of the bar. For instance the power input is briefly increased as the leading end of the bar approaches, so that the bridle rolls are rotating at the higher speed at the moment of entry. Thereafter, or even before the moment of entry, the power input is reduced to the level used while the bar is passing. It appears that the extra peripheral speed of the bridle rolls causes a considerably greater tensile force on the bar as the bar begins to pass through them, and this greater force virtually eliminates twisting or buckling of the head of the bar.
  • Preferably the bridle rolls are driven independently by permanently fitted motors by means of Cardan shafts, but a single drive to the two rolls is possible.
  • In order to obtain a good grip on the bar material, the gap between the bridle rolls before entry of the bar should preferably be about 2 mm smaller than the thickness of the bar concerned.
  • Since a certain amount of time is required to increase the speed of the bridle to the higher level, it is preferred that the approach of the leading end of the hot-rolled bar towards the finishing roll stand is observed optically, to provide an electric signal which is used to cause the temporary increase in power input.
  • An embodiment of the invention will now be described by way of example and with reference to the accompanying drawing.
  • In the drawing,
    • Fig. 1 is a diagrammatic side view of a finishing roll stand, cooling device, bridle rolls, shear and run-out table, to which the method according to the invention is applied;
    • Fig. 2 is a double graph to clarify the operation of the method.

    In Fig. 1 is shown part of a mill train for the hot-rolling of bar and wire material WS. The finishing roll stand W is followed by a cooling device K, and by a pair of bridle rolls Rl and R2, between which the "continuous" bar is frictionally gripped, relatively lightly. S indicates a shear and U the run-out table or cooling bank for the material which is cut to measure by the shear.
  • The bridle rolls Rl and R2 are driven independently through Cardan shafts CD1 and CD2 by permanently fitted electric motors Ml and M2, which are supplied from a static frequency convertor ST. In one practical embodiment, the motors Ml and M2 are squirrel-cage rotor motors rated at 3.75 kVA each and the static frequency convertor has an output of 15 kVA with a yield of 90%. The convertor ST receives signals from a photo electric cell F which detects the presence of the hot bar material in the mill train before the finishing stand W, the cell being located above the mill train before the stand W. The convertor also receives signals from a tachogenerator TG which determines the finishing rolling speed, being linked to the finishing stand W. Data are also entered, indicated by R in Fig. 1 relating to the diameter correlation and the drawing adjustment for the bar being rolled.
  • Fig. 1 shows, highly diagrammatically, that the upper bridle roll Rl is fixed while the bottom bridle roll R2 is movable since the frame in which the roll R2 is fitted can swing round a pivot located "upstream" with respect to the bar travel. An adjustable stop A determines the minimum gap between the two rolls Rl and R2. This gap is set at about 2 mm less than the thickness or diameter of the bar to be drawn. An air cylinder C, supplied from a compressed air network through a reducing valve V, normally presses the frame in which the roll R2 is fitted against the stop A (whose position is adjustable by means of a screw spindle). As soon as the bar arrives between the rolls Rl and R2, the frame leaves the stop and the air cylinder C ensures that the bar is spring gripped between the two rolls.
  • The gripping surface of the two rolls is profiled, e.g. by applying a pattern of recesses or holes and then hardened. When changing the rolls, e.g. because of wear or to change to another diameter of roll, the top roll Rl can be placed in the correct position in the rolling line by adjusting the frame carrying it.
  • Fig. 2 shows how a temporary accumulation of energy can be used to keep the bar stretched when entering the bridle rolls. Time is indicated along the horizontal axis. In the upper graph, the rotational speed n(rpm) of the bridle rolls is given on the vertical axis, and in the lower graph the control signal to the bridle roll motors is shown on the vertical axis. This control signal indicates the period of time for which a higher power input is applied. Power input can be accurately controlled by means of the static frequency convertor ST, using frequency control of the motors.
  • Fig. 2 thus shows that there is a temporary increase in the power input over a time period ts which leads (see the upper graph) to an acceleration of the bridle rolls to a higher speed, this acceleration occurring over a time period of t. The initial speed of the bridle rolls (given as 800 rpm in this example) is the idling speed of the rolls at the normal power input which is used when the bar is actually passing; this idling speed is 5 to 10% higher than the actual rolling speed of the bar. When the bar is passing, the bridle rolls must of course run at a peripheral speed equal to the rolling speed of the final roll stand W, as indicated by the slightly lower speed (e.g. 760 rpm) at the right hand side of Fig. 2.
  • As mentioned above, when the approach of the leading end of the bar is signalled, the power input to the bridle roll motors is increased, leading to a rise in speed of about 25% in this case (to about 1000 rpm). This rise is synchronised so that the leading end of the bar arrives after the higher speed is reached. In this case, the moment of arrival of the bar corresponds with the end of the time period t and is followed by the decline in speed to the level corresponding to the final rolling speed. It is this initial tension applied to the bar which minimises the damage to the head of the bar. This leads to a considerable reduction in wastage of material.
  • A 25% increase in speed is indicated above (to 1000 from 800). Suitably, this increase is in the range 15% to 35%.
  • The time ts during which the control signal is present is not fixed, nor is the time tv over which the rotating parts are speeded up. Both depend on, inter alia the speed of the bar material. The time ts is adjusted in dependence on the roll speed (via TG) automatically in ST.
  • There is a linear correlation between the supply frequency and the rotational speed n of the squirrel-cage rotor motor under zero load. As the frequency is briefly increased, the speed of the drive motors Ml and M2 rises from, in this example, 800 to 1000 rpm. As a result, more rotational energy is accumulated in the rotating parts, i.e. the rotors of the motors Ml and M2, the Cardan shafts CD1 and CD2 and the rolls Rl and R2.
  • If the photo-electric cell F is located at a distance of about 7 metres from the bridle rolls Rl, R2, and the speed of the bar is about 14 metres per second, 0.5 seconds is available to increase the speed. On entering the rolls Rl,R2, the head of the bar will be subjected to a considerable tensile force between the rolls owing to the difference in the speed between these rolls and the stand W, so that the head of the bar will remain straight.
  • Because also the gap between the rolls at the time of entry of the bar is about 2 mm less than the diameter of the bar, there is less slip on entry between the bridle rolls and the bar material, so that there is an additional advantage that the bridle rolls last longer.

Claims (6)

1. Method of rolling a length of metal bar or wire wherein the metal length (WS) is passed through a roll stand (W) and subsequently through at least one cooling device (K) and is maintained under tension in the cooling device (K) by means of an opposed pair of driven bridle rolls (Rl,R2), located after the cooling device, which frictionally grip the metal length between them and which are driven, during passage of the metal length, with a power input which, if the metal length were absent would cause the bridle rolls to rotate at a first peripheral speed of the bridle rolls higher than the rolling speed of the metal length in the said roll stand (W), characterized in that:
at the moment when the leading end of the metal length reaches the bridle rolls, the bridle rolls are rotating at a second peripheral speed higher than said first peripheral speed.
2. A method according to claim 1 wherein the bridle rolls are normally run, during passagebf a metal length and in the intervals between the passage of metal lengths, at the said power input corresponding to the said first peripheral speed, and upon approach of the leading end of a metal length the power input is transitorily increased in order to cause the bridle roll speed to rise to said second peripheral speed.
3. A method according to claim 1 or claim 2 wherein the two bridle rolls (Rl,R2) are driven separately by respective electric motors, via Cardan shafts.
4. A method according to any one of claims 1 to 3 wherein before insertion of the metal length between the bridle rolls, there is a gap between the bridle rolls with a width of about 2 mm less than the thickness of the metal length.
5. A method according to any one of the preceding claims wherein the approach of the leading end of the metal length to the bridle rolls is detected by optical means (F) before the said roll stand (W), the output signal of the optical means being used to actuate a rise in the speed of the bridle rolls to said second peripheral speed.
6. Apparatus for carrying out the method of claim 4 having a roll stand (W), a cooling device (K), bridle rolls (Rl,R2), drive motors (Ml,M2) for the bridle rolls (Rl,R2) in the form of squirrel-cage rotor motors supplied by a static frequency convertor (ST), a photo-electric cell (F) arranged to detect the presence of a hot metal length (WS) in front of the roll stand (W), and a tachogenerator (TG) linked to the roll stand (W) to determine the rolling speed therein of the metal length, the output signals from the cell (F) and tachogenerator (TG) being fed to the frequency convertor (ST) for control of the motors (Ml,M2) in dependence on those signals.
EP81200028A 1980-01-21 1981-01-12 Method of rolling a length of metal bar or wire and apparatus for carrying out the method Expired EP0032766B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81200028T ATE6913T1 (en) 1980-01-21 1981-01-12 METHOD OF ROLLING METAL RODS AND WIRE AND APPARATUS FOR CARRYING OUT THE PROCESS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8000356 1980-01-21
NLAANVRAGE8000356,A NL171334C (en) 1980-01-21 1980-01-21 METHOD AND APPARATUS FOR KEEPING HOT ROLLED BAR MATERIAL DURING COOLING

Publications (2)

Publication Number Publication Date
EP0032766A1 true EP0032766A1 (en) 1981-07-29
EP0032766B1 EP0032766B1 (en) 1984-04-04

Family

ID=19834707

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81200028A Expired EP0032766B1 (en) 1980-01-21 1981-01-12 Method of rolling a length of metal bar or wire and apparatus for carrying out the method

Country Status (6)

Country Link
EP (1) EP0032766B1 (en)
AT (1) ATE6913T1 (en)
CA (1) CA1153585A (en)
DE (1) DE3162915D1 (en)
ES (1) ES498652A0 (en)
NL (1) NL171334C (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0219316A2 (en) * 1985-10-09 1987-04-22 MORGAN CONSTRUCTION COMPANY (a Massachusetts corporation) Controlling product tension in rolling mills
EP1066891A2 (en) * 1999-07-07 2001-01-10 Morgan Construction Company Tension control system and method for reducing front and tail end overfill of a continuously hot rolled product
RU2743177C1 (en) * 2020-08-31 2021-02-15 Публичное Акционерное Общество "Новолипецкий металлургический комбинат" Control method of high-speed mode of broadband rolling mill deflecting roll table

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7414028A (en) * 1974-10-28 1976-05-03 Hoogovens Ijmuiden Bv Mechanism to tension metal rods emerging from rolling mill - receives rod between rollers running at speed greater than speed of rod

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2756169A (en) * 1950-10-19 1956-07-24 John A Roebling S Sons Corp Method of heat treating hot rolled steel rods
DE967071C (en) * 1953-07-10 1957-10-03 Schloemann Ag A device provided in a rolling train for rolling out fine iron, in particular wire, to achieve a distance between the individual parts of a strand of rolling stock divided within the rolling train
GB932587A (en) * 1959-09-15 1963-07-31 South African Iron & Steel A method and means for the detection of cobble in continuous rolling mills
DE1777431A1 (en) * 1966-04-29 1975-01-09 Demag Ag DRUM WINDING DEVICE
FR2004405A1 (en) * 1968-03-21 1969-11-21 Schloemann Ag Water cooling section for hot rolled wire
GB1514460A (en) * 1974-09-10 1978-06-14 British Steel Corp Cooling system for metal articles
BE846615R (en) * 1976-09-24 1977-01-17 PLANT FOR PROCESSING LAMINATED STEEL PRODUCTS
FR2389436A1 (en) * 1977-05-06 1978-12-01 Secim Continuous casting installation contg. pinch rolls - the upper roll being mechanically displaceable from the lower for ease of introduction of the cast bar

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7414028A (en) * 1974-10-28 1976-05-03 Hoogovens Ijmuiden Bv Mechanism to tension metal rods emerging from rolling mill - receives rod between rollers running at speed greater than speed of rod

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
METALLURGIST, Vol. 20, No. 5/6, May/June 1976, pages 416-417 New York, U.S.A. V.E. BELENKOV: "Auxiliary feeder for a wire coiler". *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0219316A2 (en) * 1985-10-09 1987-04-22 MORGAN CONSTRUCTION COMPANY (a Massachusetts corporation) Controlling product tension in rolling mills
EP0219316A3 (en) * 1985-10-09 1987-11-19 Morgan Construction Company Controlling product tension in rolling mills
EP1066891A2 (en) * 1999-07-07 2001-01-10 Morgan Construction Company Tension control system and method for reducing front and tail end overfill of a continuously hot rolled product
EP1066891A3 (en) * 1999-07-07 2003-01-15 Morgan Construction Company Tension control system and method for reducing front and tail end overfill of a continuously hot rolled product
RU2743177C1 (en) * 2020-08-31 2021-02-15 Публичное Акционерное Общество "Новолипецкий металлургический комбинат" Control method of high-speed mode of broadband rolling mill deflecting roll table

Also Published As

Publication number Publication date
EP0032766B1 (en) 1984-04-04
NL171334B (en) 1982-10-18
ATE6913T1 (en) 1984-04-15
NL8000356A (en) 1981-08-17
ES8200827A1 (en) 1981-11-16
ES498652A0 (en) 1981-11-16
NL171334C (en) 1983-03-16
CA1153585A (en) 1983-09-13
DE3162915D1 (en) 1984-05-10

Similar Documents

Publication Publication Date Title
US4958677A (en) Rolling installation for and rolling method of continuous cast strip
US4074555A (en) Method of and apparatus for improving hot-rolled sheet-metal strips
KR950009138B1 (en) Control device for plate meterial hot rolling equipment
RU2220799C2 (en) Hot rolling mill
US4388816A (en) Method and apparatus for rolling a length of metal bar or wire
US5966978A (en) Reeling unit for strip
EP0032766B1 (en) Method of rolling a length of metal bar or wire and apparatus for carrying out the method
JP3502596B2 (en) Tension control system and method for reducing ridges at the beginning and end of continuously hot-rolled products
US4643013A (en) Coil guide system for hot strip mills
CA2048127A1 (en) Process for coiler drum alternation in incessant hot rolling and apparatus therefor
DE58909734D1 (en) Method and device for hot strip rolling
GB2163689A (en) Hot rolling metal strip
JP2639001B2 (en) Rolling equipment
JP2003136108A (en) Hot rolling system and method for threading run out table and method for manufacturing rolled plate
JP3004780B2 (en) Method and apparatus for straightening tip of rolled material and hot strip rolling equipment
US4430875A (en) Rolling mill for the stretch-reducing of tubes
JP3202549B2 (en) Looper control method for finishing mill
US5860311A (en) Method to guide the strip between the stands in a rolling mill finishing train and relative device
JPS5854888B2 (en) Atsuenkinojidouseigiyosouchi
US3618347A (en) Method of operating a hot strip-finishing train when a leading end of strip to be rolled has been stuck
EP0408911B1 (en) Method for high-speed rolling and system for high-speed rolling
JP4599729B2 (en) Sheet passing method and looper control method for thin hot rolling mill
US5992201A (en) Rolling and shearing process and apparatus background
JPS63168201A (en) Universal roughing mill for h-shape steel
JP3389841B2 (en) Reverse rolling method

Legal Events

Date Code Title Description
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

17P Request for examination filed

Effective date: 19810112

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LI LU

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: HOOGOVENS GROEP B.V.

ITF It: translation for a ep patent filed

Owner name: JACOBACCI & PERANI S.P.A.

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LI LU

REF Corresponds to:

Ref document number: 6913

Country of ref document: AT

Date of ref document: 19840415

Kind code of ref document: T

REF Corresponds to:

Ref document number: 3162915

Country of ref document: DE

Date of ref document: 19840510

ET Fr: translation filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19850131

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
ITTA It: last paid annual fee
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 19891211

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19891212

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19891219

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 19891220

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19891231

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19900102

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: LU

Payment date: 19900109

Year of fee payment: 10

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Effective date: 19910112

Ref country code: GB

Effective date: 19910112

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CH

Effective date: 19910131

Ref country code: BE

Effective date: 19910131

Ref country code: LI

Effective date: 19910131

GBPC Gb: european patent ceased through non-payment of renewal fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19910930

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19911001

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST