EP0032766B1 - Procédé et dispositif pour laminer des longueurs de barres ou de fils métalliques - Google Patents

Procédé et dispositif pour laminer des longueurs de barres ou de fils métalliques Download PDF

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Publication number
EP0032766B1
EP0032766B1 EP81200028A EP81200028A EP0032766B1 EP 0032766 B1 EP0032766 B1 EP 0032766B1 EP 81200028 A EP81200028 A EP 81200028A EP 81200028 A EP81200028 A EP 81200028A EP 0032766 B1 EP0032766 B1 EP 0032766B1
Authority
EP
European Patent Office
Prior art keywords
bridle rolls
length
metal length
speed
metal
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
Application number
EP81200028A
Other languages
German (de)
English (en)
Other versions
EP0032766A1 (fr
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/de
Publication of EP0032766A1 publication Critical patent/EP0032766A1/fr
Application granted granted Critical
Publication of EP0032766B1 publication Critical patent/EP0032766B1/fr
Expired 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
    • 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 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 rolls turn in bearings in the upstanding sides of the parallelogram-shaped yoke.
  • the motors are fitted in the said upstanding sides.
  • the first part of the bar became 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 improve the said known method in a way to avoid this disadvantage.
  • the approach of the leading end of the metal length to the bridle rolls is detected by optical means before the said roll stand, the output signal of the optical means is used to increase transitorily the power input, so that at the moment when the leading end of the metal length reaches the bridle rolls the bridle rolls are temporarily rotating at a second peripheral speed higher than the said first peripheral speed, whereafter the speed of the bridle rolls with the metal length between them is lowered to the value corresponding to the rolling speed of the metal length in the roll stand, which speed is maintained during the further passage of the metal length.
  • the temporarily 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.
  • FR-A-2004405 gives a contradictory teaching that the metal length is to be decelerated prior to the entrance of the metal length in a cooling device and is afterwards accelerated.
  • a photocell optical means as a device for detecting the arrival of the rod material at the beginning of the controlled section of a rolling line is known per se from GB-A-932587.
  • the two bridle rolls are driven separately by respective permanently fitted electric motors via Cardan shafts, but a single drive to the two rolls is possible.
  • Cardan shafts to drive bridle rolls are known per se from FR-A-2389436.
  • 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.
  • BE-A-846615 mentions a relilient surface on the bridle rolls so that the gap between them can be less than the thickness of the bar.
  • 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 R1 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 R1 and R2 are driven independently through Cardan shafts CD1 and CD2 by permanently fitted electric motors M1 and M2, which are supplied from a static frequency convertor ST.
  • the motors M1 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 R1 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 P1 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 R1 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 R1 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 s 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. 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 R1, R2, and the speed of the bar is about 14 meters per second, 0.5 seconds is available to increase the speed.
  • the head of the bar On entering the rolls R1, 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Control Of Metal Rolling (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Processing Of Terminals (AREA)
  • Cable Accessories (AREA)

Claims (4)

1. Procédé pour laminer des longueurs de barres ou de fils métalliques dans lequel on fait passer la longueur (WS) de métal dans une cage (W) de laminoir et ensuite dans un dispositif (K) de refroidissement au moins, cette longueur de métal étant maintenue en traction dans le dispositif (K) de refroidissement au moyen de deux cylindres opposés d'entraînement (R1, R2) commandés par moteur, montés en aval du dispositif (K) de refroidissement et qui saisissent entre eux par friction la longueur (WS) de métal, ces cylindres d'entraînement (R1, R2) étant commandés pendant le passage de la longueur (WS) de métal avec une énergie d'entrée qui les ferait tourner, en l'absence de la longueur (WS) de métal, à une première vitesse périphérique supérieure à la vitesse de laminage de la longueur (WS) de métal dans la cage (W) de laminoir, ce procédé étant caractérisé en ce que l'approche des cylindres d'entraînement (R1, R2) par l'extrémité avant de la longueur (WS) de métal, est détectée par un moyen optique (F) placé en amont de la cage (W) de laminoir, le signal de sortie de ce moyen optique (F) étant utilisé pour augmenter momentanément l'énergie d'entrée de sorte que, au moment où l'extrémité avant de la longueur (WS) de métal atteint les cylindres d'entraînement (R1, R2), ceux-ci tournent temporairement à une deuxième vitesse périphérique supérieure à la première vitesse périphérique, après quoi lorsque la longueur (WS) de métal a pénétré entre les cylindres d'entraînement (R1, R2), la vitesse de ces derniers est abaissée jusqu'à la valeur correspondant à la vitesse de laminage de la longueur (WS) de métal dans la cage (W) de laminoir, cette vitesse étant maintenue pendant la suite du passage de la longueur (WS) de métal.
2. Procédé suivant la revendication 1, dans lequel les deux cylindres d'entraînement (R1) R2) sont commandés séparément par des moteurs électriques respectifs montés à demeure et par l'untermédiaire d'arbres à cardan. cardan.
3. Procédé suivant l'une des revendications 1 ou 2, dans lequel l'écartement des cylindres d'entraînement (R1, R2), avant la pénétration de la longueur (WS) de métal entre ceux-ci, a une largeur inférieure de 2 mm environ à l'épaisseur de la longueur (WS) de métal.
4. Dispositif pour mettre en oeuvre le procédé suivant la revendication 1, comprenant une cage (W) de laminoir; un dispositif (K) de refroidissement; des cylindres d'entraînement (R1, R2); des moteurs (M1, M2) pour commander les cylindres d'entraînement (R1, R2), ces moteurs étant des moteurs à cage d'écureuil, alimentés par un convertisseur statique de fréquence (ST); une cellule photo- électrique (F) disposée pour détecter la présence d'une longueur (WS) de métal chaud en amont de la cage (W) de laminoir; et un tachygénérateur (TG) relié à la cage (W) de laminoir afin de déterminer la vitesse de laminage de la longueur de métal, les signaux de sortie de la cellule (F) et du tachygénérateur (TG) et un signal d'entrée (R) relatif à la corrélation entre les diamètres et au réglage de l'étirage de la longueur (WS) de métal étant introduits dans le convertisseur de fréquence (ST) afin de commander les moteurs (M1, M2) en relation avec ces signaux.
EP81200028A 1980-01-21 1981-01-12 Procédé et dispositif pour laminer des longueurs de barres ou de fils métalliques Expired EP0032766B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81200028T ATE6913T1 (de) 1980-01-21 1981-01-12 Verfahren zum walzen von metallstaeben und -draht und apparat zur durchfuehrung des verfahrens.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NLAANVRAGE8000356,A NL171334C (nl) 1980-01-21 1980-01-21 Werkwijze en inrichting voor het tijdens het koelen gestrekt houden van warmgewalst staafmateriaal.
NL8000356 1980-01-21

Publications (2)

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

Family

ID=19834707

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81200028A Expired EP0032766B1 (fr) 1980-01-21 1981-01-12 Procédé et dispositif pour laminer des longueurs de barres ou de fils métalliques

Country Status (6)

Country Link
EP (1) EP0032766B1 (fr)
AT (1) ATE6913T1 (fr)
CA (1) CA1153585A (fr)
DE (1) DE3162915D1 (fr)
ES (1) ES8200827A1 (fr)
NL (1) NL171334C (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4665730A (en) * 1985-10-09 1987-05-19 Morgan Construction Company Method of controlling product tension in a rolling mill
US6167736B1 (en) * 1999-07-07 2001-01-02 Morgan Construction Company Tension control system and method for reducing front end and tail end overfill of a continuously hot rolled product
RU2743177C1 (ru) * 2020-08-31 2021-02-15 Публичное Акционерное Общество "Новолипецкий металлургический комбинат" Способ управления скоростным режимом отводящего рольганга широкополосного стана

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL154129C (fr) * 1974-10-28 1900-01-01
US2756169A (en) * 1950-10-19 1956-07-24 John A Roebling S Sons Corp Method of heat treating hot rolled steel rods
DE967071C (de) * 1953-07-10 1957-10-03 Schloemann Ag In einer Walzenstrasse zum Auswalzen von Feineisen, insbesondere Draht, vorgesehene Einrichtung zur Erzielung eines Abstandes zwischen den einzelnen Teilen eines innerhalb der Walzenstrasse geteilten Walzgutstranges
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
GB1162859A (en) * 1966-04-29 1969-08-27 Demag Ag Rolling Mill Plant for the production of Wire
FR2004405A1 (en) * 1968-03-21 1969-11-21 Schloemann Ag Water cooling section for hot rolled wire
DE2539422A1 (de) * 1974-09-10 1976-03-25 British Steel Corp Verfahren zum kuehlen heissgewalzter stangen, knueppel oder barren und kuehlsystem zur ausuebung des verfahrens
BE846615R (fr) * 1976-09-24 1977-01-17 Installation pour le traitement des produits en acier lamines
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 (9)

* 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 (de) * 1953-07-10 1957-10-03 Schloemann Ag In einer Walzenstrasse zum Auswalzen von Feineisen, insbesondere Draht, vorgesehene Einrichtung zur Erzielung eines Abstandes zwischen den einzelnen Teilen eines innerhalb der Walzenstrasse geteilten Walzgutstranges
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
GB1162859A (en) * 1966-04-29 1969-08-27 Demag Ag Rolling Mill Plant for the production of Wire
FR2004405A1 (en) * 1968-03-21 1969-11-21 Schloemann Ag Water cooling section for hot rolled wire
DE2539422A1 (de) * 1974-09-10 1976-03-25 British Steel Corp Verfahren zum kuehlen heissgewalzter stangen, knueppel oder barren und kuehlsystem zur ausuebung des verfahrens
NL154129C (fr) * 1974-10-28 1900-01-01
BE846615R (fr) * 1976-09-24 1977-01-17 Installation pour le traitement des produits en acier lamines
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

Also Published As

Publication number Publication date
NL171334B (nl) 1982-10-18
CA1153585A (fr) 1983-09-13
ES498652A0 (es) 1981-11-16
NL171334C (nl) 1983-03-16
ES8200827A1 (es) 1981-11-16
ATE6913T1 (de) 1984-04-15
NL8000356A (nl) 1981-08-17
DE3162915D1 (en) 1984-05-10
EP0032766A1 (fr) 1981-07-29

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