EP0551657A1 - Method for minimizing the crop end losses of concrete ribbed bars surface treatment by controlled cooling at rolling temperature - Google Patents
Method for minimizing the crop end losses of concrete ribbed bars surface treatment by controlled cooling at rolling temperature Download PDFInfo
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- EP0551657A1 EP0551657A1 EP92122120A EP92122120A EP0551657A1 EP 0551657 A1 EP0551657 A1 EP 0551657A1 EP 92122120 A EP92122120 A EP 92122120A EP 92122120 A EP92122120 A EP 92122120A EP 0551657 A1 EP0551657 A1 EP 0551657A1
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- European Patent Office
- Prior art keywords
- cooling
- winding layer
- wire
- section
- cooling section
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- 238000001816 cooling Methods 0.000 title claims abstract description 103
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000005096 rolling process Methods 0.000 title claims abstract description 12
- 238000004381 surface treatment Methods 0.000 title 1
- 238000004804 winding Methods 0.000 claims description 24
- 230000000694 effects Effects 0.000 claims description 14
- 239000002826 coolant Substances 0.000 claims description 11
- 238000005496 tempering Methods 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000011144 upstream manufacturing Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910000734 martensite Inorganic materials 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/573—Continuous furnaces for strip or wire with cooling
- C21D9/5732—Continuous furnaces for strip or wire with cooling of wires; of rods
-
- 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
- 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
-
- 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
- B21B1/163—Rolling or cold-forming of concrete reinforcement bars or wire ; Rolls therefor
Definitions
- the invention relates to a method for minimizing the crop losses of corrugated fin wire in the case of its edge tempering by controlled cooling from the rolling heat, the cooling after exit from a wire block in a cooling section having a number of cooling pipes in series between the latter and a downstream winding layer, and the wire after edge reimbursement is introduced into the winding layer.
- the invention has for its object to improve and modify the cooling process for edge hardening of comparatively thin concrete finned wire from the rolling heat in such a way that the crop losses are reduced considerably in the simplest possible manner and with existing means, without a reduction in quality.
- the object is achieved in a method of the type mentioned at the outset with the invention in that the cooling for comparatively thin types of wire between 6 and 10 mm is moved to a region of the cooling section closest to the winding layer.
- the new method can be used to advantage, because then the cooling process, as was previously the case, begins both immediately after the wire finishing block and is also continued and completed with increased intensity in the area in front of the coater .
- the thick wire with the additional method according to the invention achieves an increase in quality in the edge zone compensation.
- An embodiment of the method provides that a cooling phase with the greatest temperature gradient is moved to the area of the cooling section closest to the winding layer.
- a further embodiment of the invention provides that at least one additional cooling tube is used locally to intensify the cooling effect of the area of the cooling section closest to the winding layer.
- the method can also be advantageously implemented, however, in that the cooling tube closest to the coater is intensified in its cooling effect.
- the cooling tube can be lengthened, for example, which increases the dwell time of the wire passing through and thus the cooling phase, thereby intensifying the cooling effect.
- Another type of intensification can also be achieved in that the use of at least in a cooling tube in front of the winding layer Coolant is intensified by increasing pressure and / or amount.
- One embodiment of the method further provides that the control of the cooling in the individual cooling tubes in sections is carried out according to a program which controls the sections of the cooling section using a computer-controlled guide unit. Optimal compensation results can be set.
- the family tree of a rolling mill shown in FIG. 1 shows a furnace (1), followed by pull-out and back-drive, pendulum shears and Press water descaling (2), an eight-stand roughing mill (3), a six-stand intermediate mill (4) and a five-stand finishing train (5) for bar rolling with rotary cropping and chopping shears (6).
- the reference numbers (7-14, 22) denote stations of a subsequent fine steel mill, which is not part of the subject matter of the invention, but are mentioned for the sake of completeness, with (7) a water cooling section, (8) a driver, (9) an inlet roller table, ( 10) a rotary shear, (11) an inlet channel with a switch, (12) a rake cooling bed, (13) a multi-core driver, (14) a multi-core straightening machine and (22) a scaffolding site.
- the wire mill branches off from the finishing train (5) for the bar rolling.
- This has a water box (23) in which the wire temperature is reduced to an optimum temperature range for finish rolling in the wire finishing block (26).
- the cropping and chopping shears (24) and the looping table (25) are also connected upstream of the wire finishing block (26).
- This is followed by the cooling section (27) with four cooling pipes (36a - 36d), in which the edge coating of the concrete fin wire is carried out by controlled cooling.
- the Stelmor system (29) adjoins the winding layer (28) and ends at the wire ring image chamber (30).
- the four cooling pipes (36a - 36d) provided in the layout receive their coolant allocation through adjustable coolant valves (33a - 33d).
- An additional cooling tube (31) with a coolant supply valve (35) can be used there, for example, for the focus of the cooling of the thin wire tip provided in the method according to the invention in a region of the cooling section (27) closest to the winding layer (28).
- An additional coolant distribution valve (32) can also be provided for the main focus of the cooling effect in the area in front of the winding layer (28). This allocates an additional amount of coolant, sometimes with increased pressure, to the cooling pipe (36d).
- the method can also be designed so that the cooling tube (36d) closest to the winding layer (28) is significantly intensified in its cooling effect, for example by lengthening it.
- the use of coolant in the cooling pipe (36d) can also be intensified by increasing the pressure and / or quantity.
- the arrangement of an additional coolant distribution valve (32) shown in FIG. 1 serves this purpose, for example.
- the control of the cooling effect in the individual cooling tubes (36a-36d) is carried out according to a program which controls the sections of the cooling section (27) using a computer-controlled guide unit (34) is made.
- This transmits setting impulses to the coolant distribution members (33a - 33d) or (32 and 35), according to which the cooling tubes (36a - 36d) or (31) are supplied with coolant to a greater or lesser extent.
- the cooling phase with the greatest temperature gradient can be shifted into the area of the cooling section (27) closest to the winding layer (28) when quenching comparatively thin types of wire.
- the invention very advantageously minimizes cropping losses by simple means and measures and avoids interruptions in operation due to the wire tip breaking out.
- the method optimally fulfills the task set out above.
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Minimierung der Schopfverluste von Beton-Rippendraht bei dessen Randvergütung durch kontrollierte Abkühlung aus der Walzhitze, wobei die Abkühlung nach Austritt aus einem Drahtfertigblock in einer zwischen diesem und einem nachgeschalteten Windungsleger mehrere Kühlrohre in Reihe aufweisenden Kühlstrecke erfolgt und der Draht nach erfolgter Randvergütung in den Windungsleger eingeführt wird.The invention relates to a method for minimizing the crop losses of corrugated fin wire in the case of its edge tempering by controlled cooling from the rolling heat, the cooling after exit from a wire block in a cooling section having a number of cooling pipes in series between the latter and a downstream winding layer, and the wire after edge reimbursement is introduced into the winding layer.
Bei der Randvergütung von Beton-Rippendraht aus der Walzhitze beginnt üblicherweise die Wasserkühlung unmittelbar hinter dem Drahtfertigblock. Vielfach wird dabei die Wasserkühlung erst dann eingeschaltet, wenn die Drahtspitze den vor dem Windungsleger installierten Treiber durchlaufen hat, um ein Ausbrechen infolge zu frühzeitig einsetzender Kühlung zu verhindern. Hierdurch entsteht eine unzureichend gekühlte bzw. vergütete Drahtspitze, die länger sein kann als der Abstand zwischen Block und Treiber und beispielsweise eine Länge von mehr als 45 m aufweist. Diese Drahtspitze mußte bisher geschopft werden und verringerte somit das Ausbringen der Drahtstraße. Insbesondere trifft dieser Nachteil auf relativ dünne Drahtsorten zwischen 6 und 10 mm zu.When tempering concrete ribbed wire from the rolling heat, water cooling usually begins immediately behind the wire block. In many cases, the water cooling is only switched on when the wire tip has passed through the driver installed in front of the turntable in order to prevent a break-out due to cooling that starts too early. This creates an insufficiently cooled or tempered wire tip that is longer can be as the distance between block and driver and for example has a length of more than 45 m. Until now, this wire tip had to be scooped and thus reduced the output of the wire mill. This disadvantage applies in particular to relatively thin types of wire between 6 and 10 mm.
Der Erfindung liegt die Aufgabe zugrunde, das Abkühlungsverfahren zur Randvergütung von vergleichsweise dünnem Beton-Rippendraht aus der Walzhitze derart zu verbessern und zu modifizieren, daß damit ohne Qualitätsminderung auf möglichst einfache Weise und mit vorhandenen Mitteln die Schopfverluste wesentlich verringert werden.The invention has for its object to improve and modify the cooling process for edge hardening of comparatively thin concrete finned wire from the rolling heat in such a way that the crop losses are reduced considerably in the simplest possible manner and with existing means, without a reduction in quality.
Die Lösung der Aufgabe gelingt bei einem Verfahren der eingangs genannten Art mit der Erfindung dadurch, daß die Abkühlung für vergleichsweise dünne Drahtsorten zwischen 6 und 10 mm in einen dem Windungsleger nächstgelegenen Bereich der Kühlstrecke verlegt wird.The object is achieved in a method of the type mentioned at the outset with the invention in that the cooling for comparatively thin types of wire between 6 and 10 mm is moved to a region of the cooling section closest to the winding layer.
Durch die erfindungsgemäße Verlegung der Abkühlung in einen dem Windungsleger nächstgelegenen Bereich der Kühlstrecke werden für die Drahtspitze günstige, d.h. kontrollierte Kühlungsverhältnisse erreicht, die zu einer ausreichenden Randvergütung führen und die Schopfverluste der Drahtspitze wenigstens bis auf die Hälfte der ursprünglichen Länge verringern, ohne daß die Drahtspitze beim Durchlauf durch die Kühlstrecke ausbricht. Die erfindungsgemäße Lösung ist unkompliziert und kostengünstig und läßt sich bei praktisch allen vorhandenen Kühlstrecken problemlos einrichten.By laying the cooling in accordance with the invention in a region of the cooling section closest to the winding layer, favorable, that is, controlled cooling conditions are achieved for the wire tip, which lead to a sufficient edge tempering and reduce the cropping losses of the wire tip at least to half of the original length, without the wire tip breaks out as it passes through the cooling section. The solution according to the invention is uncomplicated and inexpensive and can be used without problems in practically all existing cooling sections set up.
Auch bei Drahtabmessungen von 12 mm und größer kann fallweise das neue Verfahren vorteilhaft angewendet werden, weil dann der Kühlprozess, wie er bisher üblich war, sowohl unmittelbar nach dem Drahtfertigblock einsetzt, als auch zusätzlich im Bereich vor dem Windungsleger mit erhöhter Intensität fortgesetzt und vollendet wird. Bei diesen Drahtdicken entstehen zwar nicht so große Schopfverluste, weil die Drahtspitze ohne auszubrechen durch die Kühlstrecke oder zumindest durch einen Teil der Kühlrohre mit eingeschalteter Kühlung transportiert werden kann, gleichwohl wird beim Dickdraht mit dem zusätzlichen Verfahren nach der Erfindung eine Qualitätssteigerung bei der Randzonenvergütung erreicht.Even with wire dimensions of 12 mm and larger, the new method can be used to advantage, because then the cooling process, as was previously the case, begins both immediately after the wire finishing block and is also continued and completed with increased intensity in the area in front of the coater . With these wire thicknesses there are not so large crop losses because the wire tip can be transported without breaking out through the cooling section or at least through part of the cooling tubes with the cooling switched on, nevertheless the thick wire with the additional method according to the invention achieves an increase in quality in the edge zone compensation.
Eine Ausgestaltung des Verfahrens sieht vor, daß eine Abkühlungsphase mit dem größten Temperatur-Gradienten in den dem Windungsleger nächstgelegenen Bereich der Kühlstrecke verlegt wird.An embodiment of the method provides that a cooling phase with the greatest temperature gradient is moved to the area of the cooling section closest to the winding layer.
Dabei kann beispielsweise so vorgegangen werden, daß die - vom Drahtfertigblock aus gesehen - dem Windungsleger vorgeordneten Kühlrohre einen vergleichsweise geringen Anteil der Abkühlung mit einem vergleichsweise niedrigen Temperaturgradienten verwirklichen, während in den dem Windungsleger nächstgelegenen Bereich der Kühlstrecke der Schwerpunkt des Abkühlungsverfahrens und damit der Randvergütung des Drahtes verlegt wird. Hierdurch nimmt die Kühlwirkung im Verlauf der Kühlstrecke von deren Anfang bis zum Windungsleger allmählich zu, so daß ohne Gefahr des Ausbrechens der Drahtspitze eine optimale Randvergütung des Drahtes bei wesentlich verringerten Schopfverlusten erreicht wird. Durch die stetige Zunahme der Kühlung wird zuverlässig verhindert, daß die Drahtspitze auch bei vergleichsweise dünnen Drahtsorten beim Durchlauf durch die Kühlrohre ausbricht, auch wenn sie noch nicht den vor dem Windungsleger installierten Treiber durchlaufen hat. Andererseits wird bei dieser Ausgestaltung des Verfahrens eine stetig zunehmende Abkühlung und damit Vergütung der Drahtspitze bewirkt, die dann im Bereich der Kühlstrecke vor dem Windungsleger vollendet wird.This can be done, for example, in such a way that the cooling tubes - upstream of the wire laying block - upstream of the coil layer realize a comparatively small proportion of the cooling with a comparatively low temperature gradient, while in the area of the cooling section closest to the coil layer the focus of the cooling process and thus the edge compensation of the Wire is laid. As a result, the cooling effect decreases in the course of the cooling section Begin gradually up to the winding layer, so that an optimal edge tempering of the wire is achieved with significantly reduced cropping losses without the risk of the wire tip breaking away. The steady increase in cooling reliably prevents the wire tip from breaking out through the cooling tubes even with comparatively thin types of wire, even if it has not yet passed through the driver installed in front of the winding layer. On the other hand, with this embodiment of the method, a constantly increasing cooling and thus remuneration of the wire tip is brought about, which is then completed in the area of the cooling section in front of the winding layer.
Eine weitere Ausgestaltung der Erfindung sieht vor, daß zur Intensivierung der Kühlwirkung des dem Windungsleger nächstgelegenen Bereiches der Kühlstrecke örtlich wenigstens ein zusätzliches Kühlrohr eingesetzt wird.A further embodiment of the invention provides that at least one additional cooling tube is used locally to intensify the cooling effect of the area of the cooling section closest to the winding layer.
Das Verfahren kann mit Vorteil aber auch dadurch verwirklicht werden, daß das dem Windungsleger nächstgelegene Kühlrohr in seiner Kühlwirkung wesentlich intensiviert wird. Hierfür kann beispielsweise das Kühlrohr verlängert werden, wodurch die Verweilzeit des durchlaufenden Drahtes und damit der Kühlungsphase verlängert und dadurch die Kühlwirkung intensiviert wird.The method can also be advantageously implemented, however, in that the cooling tube closest to the coater is intensified in its cooling effect. For this purpose, the cooling tube can be lengthened, for example, which increases the dwell time of the wire passing through and thus the cooling phase, thereby intensifying the cooling effect.
Eine andere Art der Intensivierung kann aber auch dadurch erreicht werden, daß zumindest in einem Kühlrohr vor dem Windungsleger der Einsatz von Kühlmittel durch Erhöhung von Druck und/oder Menge intensiviert wird.Another type of intensification can also be achieved in that the use of at least in a cooling tube in front of the winding layer Coolant is intensified by increasing pressure and / or amount.
Eine Ausgestaltung des Verfahrens sieht weiter vor, daß die streckenweise Steuerung der Kühlung in den einzelnen Kühlrohren nach einem die Abschnitte der Kühlstrecke beherrschenden Programm unter Verwendung einer computergesteuerten Führungseinheit vorgenommen wird. Dabei lassen sich optimale Vergütungsergebnisse einstellen.One embodiment of the method further provides that the control of the cooling in the individual cooling tubes in sections is carried out according to a program which controls the sections of the cooling section using a computer-controlled guide unit. Optimal compensation results can be set.
Weitere Einzelheiten, Merkmale und Vorteile des Verfahrens ergeben sich aus den nachstehenden Erläuterungen eines in der Zeichnung schematisch dargestellten Verfahrensstammbaumes.Further details, features and advantages of the method result from the following explanations of a method family tree shown schematically in the drawing.
Es zeigen:
- Fig. 1
- ein Layout eines einadrigen Feinstahl- und Drahtwalzwerkes mit integrierter Kühlstrecke,
- Fig. 2
- ein Diagramm mit Kühlkurven für Randzonen-, Kern- und Durchschnittstemperatur eines aus der Walzhitze auf Vergütungstemperatur abgekühlten Drahtes.
- Fig. 1
- a layout of a single-core fine steel and wire rolling mill with an integrated cooling section,
- Fig. 2
- a diagram with cooling curves for edge zone, core and average temperature of a wire cooled from the rolling heat to the tempering temperature.
Der in der Figur 1 dargestellte Stammbaum eines Walzwerkes zeigt einen Ofen (1), gefolgt von Auszieh- und Rücktreiber, Pendelschere und
Preßwasserentzunderung (2), eine acht-gerüstige Vorstraße (3), eine sechs-gerüstige Zwischenstraße (4) und eine fünf-gerüstige Fertigstraße (5) für die Stabwalzung mit Rotations-Schopf- und Häckselscheren (6).The family tree of a rolling mill shown in FIG. 1 shows a furnace (1), followed by pull-out and back-drive, pendulum shears and
Press water descaling (2), an eight-stand roughing mill (3), a six-stand intermediate mill (4) and a five-stand finishing train (5) for bar rolling with rotary cropping and chopping shears (6).
Die Bezugsziffern (7 - 14, 22) bezeichnen Stationen einer anschließenden Feinstahlstraße, die nicht zum Gegenstand der Erfindung gehört, der Vollständigkeit halber aber erwähnt sind, wobei (7) eine Wasserkühlstrecke, (8) einen Treiber, (9) einen Zulaufrollgang, (10) eine Rotationsschere, (11) eine Zulaufrinne mit Weiche, (12) ein Rechenkühlbett, (13) einen mehradrigen Treiber, (14) eine mehradrige Richtmaschine und (22) einen Gerüstbauplatz bezeichnen.The reference numbers (7-14, 22) denote stations of a subsequent fine steel mill, which is not part of the subject matter of the invention, but are mentioned for the sake of completeness, with (7) a water cooling section, (8) a driver, (9) an inlet roller table, ( 10) a rotary shear, (11) an inlet channel with a switch, (12) a rake cooling bed, (13) a multi-core driver, (14) a multi-core straightening machine and (22) a scaffolding site.
Aus der Fertigstraße (5) für die Stabwalzung zweigt die Drahtstaße ab. Diese weist eine Wasserkasten (23) auf, in dem die Drahttemperatur auf einen für das Fertigwalzen im Drahtfertigblock (26) optimalen Temperaturbereich abgesenkt wird. Weiter sind dem Drahtfertigblock (26) die Schopf- und Häckselscheren (24) und der Schlingentisch (25) vorgeschaltet. Es folgt die Kühlstrecke (27) mit vier Kühlrohren (36a - 36d), in welchen die Randvergütung des Beton-Rippendrahtes durch kontrollierte Abkühlung vorgenommen wird. An den Windungsleger (28) schließt sich die Stelmoranlage (29) an, die an der Drahtring-Bildekammer (30) endet. Die im Layout vorgesehenen vier Kühlrohre (36a - 36d) erhalten ihre Kühlmittelzuteilung durch einstellbare Kühlmittelventile (33a - 33d).The wire mill branches off from the finishing train (5) for the bar rolling. This has a water box (23) in which the wire temperature is reduced to an optimum temperature range for finish rolling in the wire finishing block (26). The cropping and chopping shears (24) and the looping table (25) are also connected upstream of the wire finishing block (26). This is followed by the cooling section (27) with four cooling pipes (36a - 36d), in which the edge coating of the concrete fin wire is carried out by controlled cooling. The Stelmor system (29) adjoins the winding layer (28) and ends at the wire ring image chamber (30). The four cooling pipes (36a - 36d) provided in the layout receive their coolant allocation through adjustable coolant valves (33a - 33d).
Für die mit dem erfindungsgemäßen Verfahren vorgesehene schwerpunktmäßige Verlegung der Abkühlung der Dünndrahtspitze in einen dem Windungsleger (28) nächstgelegenen Bereich der Kühlstrecke (27) kann beispielsweise dort ein zusätzliches Kühlrohr (31) mit einem Kühlmittelzuteilungsventil (35) verwendet werden. Auch kann zur schwerpunktsmäßigen Verlegung der Kühlwirkung in den Bereich vor den Windungsleger (28) ein zusätzliches Kühlmittelzuteilungsventil (32) vorgesehen sein. Dieses teilt dem Kühlrohr (36d) eine zusätzliche Menge Kühlmittel, fallweise mit erhöhtem Druck, zu.An additional cooling tube (31) with a coolant supply valve (35) can be used there, for example, for the focus of the cooling of the thin wire tip provided in the method according to the invention in a region of the cooling section (27) closest to the winding layer (28). An additional coolant distribution valve (32) can also be provided for the main focus of the cooling effect in the area in front of the winding layer (28). This allocates an additional amount of coolant, sometimes with increased pressure, to the cooling pipe (36d).
Auf diese Weise wird im Bereich vor dem Windungsleger (28) bzw. dem zugeordneten Treiber eine im Verhältnis zu den vorangehenden Bereichen der Kühlstrecke (27) wesentlich intensivierte Kühlwirkung erreicht, dabei das Ausbrechen der Drahtspitze verhindert und bei zufriedenstellender Vergütung der Schopfverlust erheblich verringert.In this way, in the area in front of the winding layer (28) or the associated driver, a cooling effect which is significantly intensified in relation to the preceding areas of the cooling section (27) is achieved, the breaking of the wire tip is prevented and, with a satisfactory remuneration, the crop loss is considerably reduced.
Das Verfahren kann aber auch so ausgestaltet werden, daß das dem Windungsleger (28) nächstgelegene Kühlrohr (36d) in seiner Kühlwirkung wesentlich intensiviert wird, indem es beispielsweise verlängert wird. Auch kann im Kühlrohr (36d) der Einsatz von Kühlmittel durch Erhöhung von Druck und/oder Menge intensiviert werden. Diesem Zweck dient beispielsweise die in der Figur 1 gezeigte Anordnung eines zusätzlichen Kühlmittelzuteilungsventils (32).The method can also be designed so that the cooling tube (36d) closest to the winding layer (28) is significantly intensified in its cooling effect, for example by lengthening it. The use of coolant in the cooling pipe (36d) can also be intensified by increasing the pressure and / or quantity. The arrangement of an additional coolant distribution valve (32) shown in FIG. 1 serves this purpose, for example.
Um dabei gemäß Erfindung eine örtlich streng kontrollierte Kühlwirkung innerhalb der Kühlstrecke (27) zu erreichen, ist in einer Ausgestaltung der Erfindung weiter vorgesehen, daß die Steuerung der Kühlwirkung bei den einzelnen Kühlrohren (36a - 36d) nach einem die Abschnitte der Kühlstrecke (27) beherrschenden Programm unter Verwendung einer computergesteuerten Führungseinheit (34) vorgenommen wird. Diese überträgt an die Kühlmittelzuteilungsorgane (33a - 33d) bzw. (32 und 35) Einstellungsimpulse, nach deren Maßgabe die Kühlrohre (36a - 36d) bzw. (31) mehr oder weniger intensiv mit Kühlmittel versorgt werden. Mit dieser Maßnahme kann problemlos beim Abschrecken von vergleichsweise dünnen Drahtsorten die Abkühlungsphase mit dem größten Temperaturgradienten in den dem Windungsleger (28) nächstgelegenen Bereich der Kühlstrecke (27) verlegt werden. Dabei wird eine ausreichende Kühlwirkung sowie Vergütung der Drahtspitze erzielt, ohne daß diese vor Erreichen des Windungslegers (28) bzw. dessen Treibers beim Durchlauf durch die vorgeschalteten Kühlrohre (36a - 36c) ausbricht. Dabei wird dann, wie dies die Figur 2 zeigt, im Randbereich des Drahtes eine vorgegebene, insbesondere martensitische Gefügestruktur erreicht. Wie aus dem Verlauf der Kühlkurve für die Randzone (R) hervorgeht, wird beim Abkühlen eine schockartige Temperaturabsenkung der Randzone des Drahtes von etwa 1000oC bis auf etwa 220oC innerhalb von nur einer Sekunde erreicht. Danach steigt die Temperatur des sich martensitisch orientierenden Gefüges wieder bis auf etwa 630oC an. Diesem Temperaturverlauf folgt mit Verzögerung von 6 bis 8 Sekunden der Kerntemperaturverlauf nach der oberen Diagrammkurve (K), woraus sich der in der mittleren Diagrammkurve (D) gezeigte Verlauf der Durchschnittstemperatur ergibt.To be strictly local according to the invention To achieve a controlled cooling effect within the cooling section (27), it is further provided in one embodiment of the invention that the control of the cooling effect in the individual cooling tubes (36a-36d) is carried out according to a program which controls the sections of the cooling section (27) using a computer-controlled guide unit (34) is made. This transmits setting impulses to the coolant distribution members (33a - 33d) or (32 and 35), according to which the cooling tubes (36a - 36d) or (31) are supplied with coolant to a greater or lesser extent. With this measure, the cooling phase with the greatest temperature gradient can be shifted into the area of the cooling section (27) closest to the winding layer (28) when quenching comparatively thin types of wire. Sufficient cooling effect and tempering of the wire tip is achieved without it breaking out before reaching the winding layer (28) or its driver as it passes through the upstream cooling tubes (36a-36c). As shown in FIG. 2, a predetermined, in particular martensitic, microstructure is then achieved in the edge region of the wire. As can be seen from the course of the cooling curve for the edge zone (R), a shock-like reduction in the temperature of the edge zone of the wire from approximately 1000 ° C. to approximately 220 ° C. is achieved within only one second during cooling. The temperature of the martensitic structure then rises again to around 630 ° C. This temperature curve is followed by the core temperature curve after the upper diagram curve with a delay of 6 to 8 seconds (K), from which the course of the average temperature shown in the middle graph curve (D) results.
Mit der Erfindung werden sehr vorteilhaft mit einfachen Mitteln und Maßnahmen Schopfverluste minimiert und Betriebsunterbrechungen durch Ausbrechen der Drahtspitze vermieden. Insofern erfüllt das Verfahren in optimaler Weise die eingangs gestellte Aufgabe.The invention very advantageously minimizes cropping losses by simple means and measures and avoids interruptions in operation due to the wire tip breaking out. In this respect, the method optimally fulfills the task set out above.
Claims (8)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4201071 | 1992-01-17 | ||
| DE4201071A DE4201071A1 (en) | 1992-01-17 | 1992-01-17 | METHOD FOR MINIMIZING THE CROSS LOSS OF CONCRETE RIBDED WIRE IN ITS EDGING BY EDMING THROUGH CONTROLLED COOLING FROM THE ROLLER HEAT |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0551657A1 true EP0551657A1 (en) | 1993-07-21 |
| EP0551657B1 EP0551657B1 (en) | 1995-07-12 |
Family
ID=6449672
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP92122120A Expired - Lifetime EP0551657B1 (en) | 1992-01-17 | 1992-12-30 | Method for minimizing the crop end losses of concrete ribbed bars surface treatment by controlled cooling at rolling temperature |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0551657B1 (en) |
| AT (1) | ATE124893T1 (en) |
| DE (2) | DE4201071A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19821299A1 (en) * | 1998-05-13 | 1999-11-18 | Abb Patent Gmbh | Arrangement and method for producing hot-rolled steel strip |
| CN106001107A (en) * | 2016-06-29 | 2016-10-12 | 射洪县才伦建材有限责任公司 | Production line for high-ductility cold-rolled ribbed bars |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112775180B (en) * | 2020-12-16 | 2022-03-04 | 江苏省镔鑫钢铁集团有限公司 | Fine-grain deformed steel bar hot rolling production line |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0141511A1 (en) * | 1983-09-10 | 1985-05-15 | Ashlow Limited | Apparatus for and method of cooling elongate stock |
-
1992
- 1992-01-17 DE DE4201071A patent/DE4201071A1/en not_active Withdrawn
- 1992-12-30 EP EP92122120A patent/EP0551657B1/en not_active Expired - Lifetime
- 1992-12-30 DE DE59202876T patent/DE59202876D1/en not_active Expired - Fee Related
- 1992-12-30 AT AT92122120T patent/ATE124893T1/en not_active IP Right Cessation
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0141511A1 (en) * | 1983-09-10 | 1985-05-15 | Ashlow Limited | Apparatus for and method of cooling elongate stock |
Non-Patent Citations (1)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN vol. 11, no. 232 (C-437)29. Juli 1987 & JP-A-62 044 530 ( KOBE STEEL LTD ) 26. Februar 1987 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19821299A1 (en) * | 1998-05-13 | 1999-11-18 | Abb Patent Gmbh | Arrangement and method for producing hot-rolled steel strip |
| CN106001107A (en) * | 2016-06-29 | 2016-10-12 | 射洪县才伦建材有限责任公司 | Production line for high-ductility cold-rolled ribbed bars |
Also Published As
| Publication number | Publication date |
|---|---|
| DE4201071A1 (en) | 1993-07-22 |
| EP0551657B1 (en) | 1995-07-12 |
| DE59202876D1 (en) | 1995-08-17 |
| ATE124893T1 (en) | 1995-07-15 |
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