EP0440009A2 - Vorrichtung und Verfahren zur modulierten KÀ¼hlung eines sich bewegenden zylindrischen Gegenstandes - Google Patents

Vorrichtung und Verfahren zur modulierten KÀ¼hlung eines sich bewegenden zylindrischen Gegenstandes Download PDF

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Publication number
EP0440009A2
EP0440009A2 EP90870241A EP90870241A EP0440009A2 EP 0440009 A2 EP0440009 A2 EP 0440009A2 EP 90870241 A EP90870241 A EP 90870241A EP 90870241 A EP90870241 A EP 90870241A EP 0440009 A2 EP0440009 A2 EP 0440009A2
Authority
EP
European Patent Office
Prior art keywords
cooling
cylindrical element
compartments
orifices
temperature
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
EP90870241A
Other languages
English (en)
French (fr)
Other versions
EP0440009A3 (en
EP0440009B1 (de
Inventor
Jean-François Noville
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.)
Centre de Recherches Metallurgiques CRM ASBL
Original Assignee
Centre de Recherches Metallurgiques CRM ASBL
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 Centre de Recherches Metallurgiques CRM ASBL filed Critical Centre de Recherches Metallurgiques CRM ASBL
Priority to AT90870241T priority Critical patent/ATE95089T1/de
Publication of EP0440009A2 publication Critical patent/EP0440009A2/de
Publication of EP0440009A3 publication Critical patent/EP0440009A3/fr
Application granted granted Critical
Publication of EP0440009B1 publication Critical patent/EP0440009B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • C21D11/00—Process control or regulation for heat treatments
    • C21D11/005—Process control or regulation for heat treatments for cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • 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
    • B21B17/00—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling
    • B21B17/14—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling without mandrel, e.g. stretch-reducing mills

Definitions

  • the present invention relates to the cooling of a scrolling cylindrical element, such as a metal tube at the outlet of a reducing rolling mill.
  • Such a non-uniform distribution of the surface temperature is observed in particular in the tubes leaving horizontally from the reducing rolling mill, without rotation about their longitudinal axis.
  • These tubes may have, between their upper generator and their lower generator, a significant difference in temperature, which may for example be of the order of 50 ° C. This difference does not result from an abrupt variation, but rather from a continuous variation of the temperature between these two generators.
  • the origin of this temperature variation can be multiple.
  • Heterogeneous temperature distribution also occurs in some types of seamless tubes, particularly those formed by drilling and drawing from a preheated solid blank.
  • the forming of the tube frequently disturbs the temperature profile thereof, and any reheating does not generally improve the situation.
  • the cylindrical element hollow or solid, is subjected to differential cooling, during its reduction rolling, caused by the coolant of the rolls of the rolling mill.
  • the upper part of the cylindrical element tends to be cooler than its lower part.
  • the thermal state of the cylindrical element is particularly disturbed in the case of welded tubes, mentioned above, because the two aforementioned effects can accumulate there in extremely variable proportions.
  • the device known from the aforementioned document BE-A-08801224 provides homogeneous cooling, which hardly remedies this lack of uniformity in the surface temperature. It follows that the allotropic transformations do not occur at the same time throughout the surface area of a section of the cylindrical element, and that the latter is the seat of undesirable deformations during its cooling.
  • the object of the present invention is to remedy this significant drawback, by proposing on the one hand a device making it possible to modulate the cooling of a cylindrical element, and on the other hand a method for regulating this modulated cooling.
  • a device for the modulated cooling of a scrolling cylindrical element which comprises a tubular conduit pierced with a plurality of orifices, through which passes said cylindrical element to be cooled, and an envelope disposed around said tubular conduit to form therewith an annular chamber surrounding said cylindrical element to be cooled, said annular chamber being closed at its ends by walls, is characterized in that the internal volume of said annular chamber is divided into at least two compartments which do not communicate with each other, in that said division into compartments is carried out by at least two partition walls fixed on the one hand to the outer surface of said tubular conduit and on the other hand to the inner surface of at least one wall delimiting said annular chamber, in that said partitions divide said plurality of orifices into at least two groups of orifices, each of said compartments comprising one of said groups of orifices, and in that each of said compartments is equipped with means for supplying coolant.
  • the envelope disposed around the aforementioned tubular conduit can in principle have any shape. It is however preferable that it is cylindrical, and that it is also coaxial with said tubular conduit. It thus forms with this tubular conduit an annular chamber of constant radial height which promotes a regular flow of the cooling agent.
  • At least one of said partition walls is arranged helically on the outer surface of said tubular conduit.
  • two partition walls are provided, arranged in opposite direction helices, so that they form compartments whose circumferential dimension, that is to say the width, varies over at least part of the axial length of said tubular conduit.
  • said means for supplying at least one of said compartments comprise means for adjusting the flow rate of the cooling agent.
  • the cross section of the tube is assimilated to a clock face, so that the upper and lower generators are respectively in the positions corresponding to 12 o'clock and 6 o'clock.
  • the tube is formed by bending a steel strip and welding it into a tubular blank; this blank is then heated, generally by induction, then it passes to the reducing rolling mill to receive its final diameter.
  • the tube As indicated above, part of the cooling water used during the forming of the tube is trapped inside of it. This water vaporizes during the subsequent reheating, which compromises the uniformity of the temperature of the tube before it enters the reducing rolling mill. In the latter, the tube still undergoes irregular cooling due to the cooling water of the cylinders. As a result, at the outlet of the reducing rolling mill, the tube has a temperature distribution which is not uniform.
  • Figure 1 shows an example of such a temperature distribution along the perimeter of a cross section of the tube; for simplicity, a symmetrical distribution has been chosen with respect to the vertical plane of symmetry of the tube.
  • the tube is considered to be split along its upper generatrix (12 h) shit and the perimeter of the section has been developed along the horizontal axis.
  • Curve (a) represents the distribution of the temperature Te of the surface of the tube along the perimeter of a section of the tube at the outlet of the reducing rolling mill, that is to say at the inlet of the cooling device.
  • the cooling applied to the tube in the device of the invention aims to standardize the distribution of the surface temperature of the tube at the outlet of this device.
  • Curve (a) shows that this cooling must be modulated, that is to say must be more vigorous in the upper part of the tube (12 h) than in its lower part (6 h).
  • Curve (b) indicates a typical distribution of the flow rate Q of the coolant along the perimeter of the section of the tube, to ensure the desired modulated cooling.
  • This cooling can be adjusted so that the tube leaving the cooling device has a uniform temperature distribution Ts, illustrated here by the horizontal line (c).
  • Figure 2 shows a tubular conduit of a device according to the invention, capable of providing modulated cooling of the type illustrated in Figure 1.
  • the direction of travel of the product is indicated by a arrow.
  • a tubular conduit 1 provided with two partition walls 2,3 fixed on the outer surface of the conduit 1.
  • the conduit 1 was split along its upper generatrix (12 h) and we developed it to represent it in plan.
  • the face visible in Figure 2 is the interior surface of the tubular conduit, and the dashed lines 2, 3 indicate the position of the partitions 2, 3 fixed on the exterior surface of the conduit, as explained above.
  • the tubular conduit 1 is pierced with a plurality of orifices, which are divided into two groups according to their position relative to the partition walls 2,3.
  • the position of the coolant supply orifices in the compartments created in the annular chamber by the partition walls has also been shown diagrammatically; these upper and lower supply orifices, respectively As and Ai, are in fact provided in the envelope surrounding the tubular conduit 1, which is not shown here.
  • the two partition walls 2,3 are arranged so as to form, in the direction of travel of the cylindrical element to be cooled, an upper compartment Cs divergent and a lower compartment Ci converge.
  • the partition walls 2,3 appear rectilinear; however, they take on a helical shape when the duct is returned to its tubular shape.
  • the flow rate of the coolant in each compartment can be adjusted by any suitable means, for example by varying the actual feed rate of this liquid, and / or by modifying the number of passage orifices located in these compartments.
  • the passage orifices can be distributed in any manner known per se in the tubular conduit 1, for example in staggered rows, along helical lines or in flat crowns. They can also, individually or in any number, be provided with closing means making it possible to contribute to the modulation of the flow rate of the cooling liquid.
  • the modulation of the cooling of a cylindrical element by means of a device comprising such an annular chamber with compartments can be controlled automatically, for example by means of the regulation system illustrated in FIG. 3.
  • the cooling device according to the invention is installed at the outlet of a hot reducing rolling mill, in which the steel tube has been brought to its final outside diameter.
  • Figure 3 shows schematically the cooling device 4, with the tubular conduit 1 and the partition walls 2.3 indicated by dashed lines, the reducing rolling mill 5 and the steel tube 6 to be cooled.
  • the tube 6 moves from right to left, as indicated by the arrow.
  • the cooling device 4 is supplied with cooling liquid from a source 7, via lines 8 and 9.
  • the tube 6 emerging from the reducing rolling mill 5 has a temperature distribution of the type of curve (a) in FIG. 1, possibly with irregular fluctuations over time.
  • the objective is to achieve a temperature distribution of type (c), as uniform and as stable as possible, at the outlet of the cooling device 4.
  • the speed V of the tube 6 at the outlet of the reducing rolling mill 5 is measured, which is in fact the speed with which the tube 6 passes through the cooling device 4.
  • the surface temperature of the tube 6 is also measured at l input of the device 4, in particular to its upper generator (Tes) and to its lower generator (Tei). These values make it possible to determine the distribution of the temperature on the surface of the tube, i.e. the cylindrical element to be cooled, at the inlet of the cooling device.
  • the surface temperature of the tube 6 at the outlet of the device 4 is also measured, in particular at the upper generator (Tss) and at the lower generator (Tsi). This determines the temperature distribution on the surface of the tube, that is to say of the cylindrical element, at the outlet of the cooling device.
  • This output distribution is compared with a desired temperature distribution and at least one of the flow rates Qs, Qi is varied to cancel the differences observed between these two temperature distributions.
  • the regulation of the cooling process is preferably placed under the control of a processor 10.
  • the processor 10 is represented in two parts, for the simple purpose of preserving the clarity of the drawing.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)
  • Metal Rolling (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
EP90870241A 1990-02-01 1990-12-18 Vorrichtung und Verfahren zur modulierten Kühlung eines sich bewegenden zylindrischen Gegenstandes Expired - Lifetime EP0440009B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90870241T ATE95089T1 (de) 1990-02-01 1990-12-18 Vorrichtung und verfahren zur modulierten kuehlung eines sich bewegenden zylindrischen gegenstandes.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE9000122A BE1003665A6 (fr) 1990-02-01 1990-02-01 Dispositif et procede pour le refroidissement module d'un element cylindrique en defilement.
BE9000122 1990-02-01

Publications (3)

Publication Number Publication Date
EP0440009A2 true EP0440009A2 (de) 1991-08-07
EP0440009A3 EP0440009A3 (en) 1991-12-27
EP0440009B1 EP0440009B1 (de) 1993-09-29

Family

ID=3884660

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90870241A Expired - Lifetime EP0440009B1 (de) 1990-02-01 1990-12-18 Vorrichtung und Verfahren zur modulierten Kühlung eines sich bewegenden zylindrischen Gegenstandes

Country Status (5)

Country Link
EP (1) EP0440009B1 (de)
JP (1) JPH04220111A (de)
AT (1) ATE95089T1 (de)
BE (1) BE1003665A6 (de)
DE (1) DE69003667D1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150143746A (ko) * 2013-04-15 2015-12-23 프리메탈스 테크놀로지스 오스트리아 게엠베하 폭-종속형 냉각 작용을 갖는 냉각 장치

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU79722A1 (fr) * 1978-05-26 1979-06-13 Arbed Perfectionnements aux dispositifs de refroidissement de produits lamines metalliques
JPS58136275U (ja) * 1982-03-04 1983-09-13 エヌエス工業株式会社 ホ−ス接続金具の締付装置
DE3424550A1 (de) * 1984-07-04 1986-01-16 Fried. Krupp Gmbh, 4300 Essen Kuehlmittel-zufuehreinrichtung
BE904177A (fr) * 1986-02-05 1986-08-05 Centre Rech Metallurgique Dispositif de refroidissement d'un produit metallique en mouvement.
JPH0253326U (de) * 1988-10-12 1990-04-17
BE1002565A6 (fr) * 1988-10-24 1991-03-26 Centre Rech Metallurgique Dispositif de refroidissement d'un element cylindrique en defilement.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150143746A (ko) * 2013-04-15 2015-12-23 프리메탈스 테크놀로지스 오스트리아 게엠베하 폭-종속형 냉각 작용을 갖는 냉각 장치

Also Published As

Publication number Publication date
EP0440009A3 (en) 1991-12-27
EP0440009B1 (de) 1993-09-29
DE69003667D1 (de) 1993-11-04
ATE95089T1 (de) 1993-10-15
BE1003665A6 (fr) 1992-05-19
JPH04220111A (ja) 1992-08-11

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