EP0443304A2 - Kühlvorrichtung für einen sich bewegenden zylindrischen Gegenstand - Google Patents

Kühlvorrichtung für einen sich bewegenden zylindrischen Gegenstand Download PDF

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Publication number
EP0443304A2
EP0443304A2 EP90870242A EP90870242A EP0443304A2 EP 0443304 A2 EP0443304 A2 EP 0443304A2 EP 90870242 A EP90870242 A EP 90870242A EP 90870242 A EP90870242 A EP 90870242A EP 0443304 A2 EP0443304 A2 EP 0443304A2
Authority
EP
European Patent Office
Prior art keywords
passages
crowns
rings
cylindrical element
tubular conduit
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
EP90870242A
Other languages
English (en)
French (fr)
Other versions
EP0443304A3 (en
EP0443304B1 (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 AT90870242T priority Critical patent/ATE102090T1/de
Publication of EP0443304A2 publication Critical patent/EP0443304A2/de
Publication of EP0443304A3 publication Critical patent/EP0443304A3/fr
Application granted granted Critical
Publication of EP0443304B1 publication Critical patent/EP0443304B1/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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/62—Quenching devices
    • 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

  • the present invention relates to a device for cooling a cylindrical element in movement, such as a metal tube, making it possible to operate a homogeneous cooling of this cylindrical element.
  • the following description refers more particularly to the cooling of a steel tube at the outlet of a reducing rolling mill. It goes without saying that this particular application was chosen only for the simple purpose of illustrating the invention without any limiting effect with regard thereto.
  • the device of the invention can be used for cooling any type of cylindrical element, solid or hollow, made of ferrous or non-ferrous metal, capable of undergoing the treatment considered.
  • cylindrical element in movement is understood here to mean a product of elongated shape, for example a bar or a tube, which moves by translation along its longitudinal axis without turning around this axis.
  • a device for cooling a scrolling cylindrical element which comprises an envelope disposed around a perforated tubular conduit, with which it forms an annular chamber surrounding the cylindrical element to cool.
  • the tubular conduit has perforations providing passage to the coolant of the cylindrical element.
  • the perforations are arranged in flat rings perpendicular to the longitudinal axis of the tubular conduit, at equal distance in each ring, and each ring is angularly offset with respect to the neighboring ring.
  • the various perforation rings are angularly offset with respect to each other by a constant angle and they are also equidistant in the longitudinal direction of the tubular conduit. In this way, the perforations are arranged in regular helices in the wall of this tubular conduit.
  • This device makes it possible to operate a cooling, possibly intense, of the cylindrical element which passes through it.
  • the intensity of this cooling is not always distributed uniformly along the periphery of the cylindrical element. This may result in heterogeneity in the microstructure of the surface layer of this element. This effect is particularly noticeable during the quenching and self-tempering treatment of tubes of relatively small thickness, for example less than 5 mm.
  • the presence of islands of returned martensite having the desired thickness is observed, formed at the locations on the surface of the tube cooled by the water jets coming from the perforations which constitute the first crowns encountered by the tube. Between these islands, the thickness of the returned martensite layer may be less, and sometimes even zero, which adversely affects the properties and therefore the behavior of the tube.
  • the object of the present invention is to provide a cooling device of the aforementioned type, in which the perforations are arranged so as to guarantee the homogeneity of the intensity of the cooling over the entire periphery of the cylindrical element in movement.
  • a device for cooling a scrolling cylindrical element which comprises a straight tubular duct open at its ends, inside which passes said cylindrical element to be cooled, said tubular duct being pierced with a plurality passages arranged in flat crowns, perpendicular to the longitudinal axis of said tubular conduit and angularly offset with respect to each other, is characterized in that, seen in the direction of travel of said cylindrical element, each passage belonging to any one of said crowns, with the exception of the first, is located substantially in the middle of the circumferential distance separating the generatrices of said tubular conduit which pass by two angularly successive passages in all of the crowns preceding said arbitrary crown.
  • all of said crowns comprise the same number of passages and they are preferably arranged at equal distance from each other.
  • said rings are divided into successive groups in the direction of travel of said cylindrical element, each group comprising a number of rings sufficient for said group to have a passage located in the middle of each of the circumferential distances separating the generators which pass through two angularly successive passages in the set of crowns preceding said group.
  • tubular conduit in a manner known per se, can be surrounded by an envelope with which it forms an annular chamber coaxial with the cylindrical element to be cooled.
  • the perforations of said tubular conduit can be connected, individually or in any number, to means for supplying coolant, such as flexible pipes and flow control valves.
  • Figure 1 shows a perspective view of a tubular conduit (1), provided with eight rings (C1 - C8) each comprising twelve equidistant passages. These passages are numbered from the upper generator (2) of the tubular conduit (1), taken as a reference generator; they are counted clockwise, seen in the direction of the arrow (3) indicating the direction of travel of the cylindrical element, and they are designated by the marks (C1.01, C1.02, ... C1. 12; C2.01, C2.02 ...; ...; C8.01, C8.02 ...) according to the crown to which they belong.
  • the portion shown comprises the eight aforementioned rings (C1 - C8); in the circumferential direction, seen at the first ring (C1), it extends from the first passage (C1.01), located on the reference generator (2), to the middle of the distance separating the passages (C1.04 ) and (C1.05).
  • the crowns each comprise twelve passages in the example shown, two neighboring passages, in the same crown, are separated by an arc of 30 °, and the portion shown in Figure 2 covers an arc of 105 °.
  • the first crown (C1) serves as a reference for the arrangement of the passages of the following crowns.
  • the passages (Ci.01 to Ci.12) are distributed uniformly; only the angular offset of the crowns varies to meet the above condition.
  • the second ring (C2) is arranged such that its passages (C2.01 to C2.12) are respectively located in the middle of an arc separating two neighboring passages from the first ring.
  • the second ring is therefore offset by an angle of 15 ° clockwise from the first ring.
  • the assembly formed by the first and second rings has a uniform distribution of the coolant passages, which are thus angularly spaced 15 °, if one looks in the direction of the arrow (3).
  • the second ring (C2) thus constitutes, on its own, a first group (G1) of rings whose passages are located in the middle of the circumferential distances separating the generatrices which pass through two angularly successive passages in all of the preceding crowns, according to the feature of the present invention.
  • each of its passages (C3.01 to C3.12) is located in the middle of a circumferential distance separating the generatrices which pass through two angularly successive passages in the set of crowns (C1) and (C2); in this example, the passage (C3.01) is located between (C2.01) and (C1.02), (C3.02) is located between (C2.02) and (C1.03), etc.
  • each of its passages (C4.01 to C4.12) is located in the middle of the circumferential distance separating the generators which pass through two other angularly successive passages in the set of crowns (C1) and (C2); in this example, the passage (C4.01) is located between (C1.01) and (C2.01), (C4.02) is located between (C1.02) and (C2.02), etc.
  • all of the passages of the crowns (C3) and (C4) ensure the division of all the circumferential distances separating the generatrices which pass through the passages of all of the preceding crowns; they thus lead to a uniform distribution of the coolant passages, with spacing distances between these passages equal to a quarter of the distance separating two passages from the reference ring (C1).
  • the crowns (C3) and (C4) therefore constitute a second group (G2) of crowns respecting the characteristic of the present invention. It should also be noted that the rings (C3) and (C4) can be interchanged without modifying the overall distribution of passages at the exit of the second group (G2).
  • the arrangement of the coolant passages in the tubular conduit (1) leads to a uniform angular distribution in the form of these passages, seen in the direction of travel of the cylindrical element to be cooled. This results in uniform intensity cooling, even in the case of thin tubes.
  • the invention is however not limited to the embodiment which has been described and illustrated.
  • This gathering could even relate to at least part of the passages belonging to different groups, if the above-mentioned advantage is renounced.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Heat Treatment Of Articles (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
EP90870242A 1990-02-20 1990-12-18 Kühlvorrichtung für einen sich bewegenden zylindrischen Gegenstand Expired - Lifetime EP0443304B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90870242T ATE102090T1 (de) 1990-02-20 1990-12-18 Kuehlvorrichtung fuer einen sich bewegenden zylindrischen gegenstand.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE9000184 1990-02-20
BE9000184A BE1003667A6 (fr) 1990-02-20 1990-02-20 Dispositif de refroidissement d'un element cylindrique en defilement.

Publications (3)

Publication Number Publication Date
EP0443304A2 true EP0443304A2 (de) 1991-08-28
EP0443304A3 EP0443304A3 (en) 1992-02-26
EP0443304B1 EP0443304B1 (de) 1994-03-02

Family

ID=3884679

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90870242A Expired - Lifetime EP0443304B1 (de) 1990-02-20 1990-12-18 Kühlvorrichtung für einen sich bewegenden zylindrischen Gegenstand

Country Status (4)

Country Link
EP (1) EP0443304B1 (de)
AT (1) ATE102090T1 (de)
BE (1) BE1003667A6 (de)
DE (1) DE69007078T2 (de)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2747587A (en) * 1950-03-13 1956-05-29 United States Steel Corp Apparatus for quenching and reeling rods
GB1514460A (en) * 1974-09-10 1978-06-14 British Steel Corp Cooling system for metal articles
LU79722A1 (fr) * 1978-05-26 1979-06-13 Arbed Perfectionnements aux dispositifs de refroidissement de produits lamines metalliques
BE1002565A6 (fr) * 1988-10-24 1991-03-26 Centre Rech Metallurgique Dispositif de refroidissement d'un element cylindrique en defilement.

Also Published As

Publication number Publication date
DE69007078T2 (de) 1994-09-29
BE1003667A6 (fr) 1992-05-19
ATE102090T1 (de) 1994-03-15
DE69007078D1 (de) 1994-04-07
EP0443304A3 (en) 1992-02-26
EP0443304B1 (de) 1994-03-02

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