EP0020246A1 - Cooling device for hot rolled elongate laminated products - Google Patents

Cooling device for hot rolled elongate laminated products Download PDF

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Publication number
EP0020246A1
EP0020246A1 EP19800400715 EP80400715A EP0020246A1 EP 0020246 A1 EP0020246 A1 EP 0020246A1 EP 19800400715 EP19800400715 EP 19800400715 EP 80400715 A EP80400715 A EP 80400715A EP 0020246 A1 EP0020246 A1 EP 0020246A1
Authority
EP
European Patent Office
Prior art keywords
water
frustoconical
cooling
tube
injection head
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
EP19800400715
Other languages
German (de)
French (fr)
Other versions
EP0020246B1 (en
Inventor
Françis Bertolotti
Jean-Claude Daverio
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.)
Institut de Recherches de la Siderurgie Francaise IRSID
Original Assignee
Institut de Recherches de la Siderurgie Francaise IRSID
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
Priority to FR7914383A priority Critical patent/FR2457724B1/fr
Priority to FR7914383 priority
Application filed by Institut de Recherches de la Siderurgie Francaise IRSID filed Critical Institut de Recherches de la Siderurgie Francaise IRSID
Publication of EP0020246A1 publication Critical patent/EP0020246A1/en
Application granted granted Critical
Publication of EP0020246B1 publication Critical patent/EP0020246B1/en
Expired legal-status Critical Current

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    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHER TREATMENTS
    • C21D9/00Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54Furnaces for treating strips or wire
    • C21D9/56Continuous furnaces for strip or wire
    • C21D9/573Continuous furnaces for strip or wire with cooling
    • C21D9/5732Continuous furnaces for strip or wire with cooling of wires; of rods
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B45/00Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02Devices 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
    • B21B45/0203Cooling
    • B21B45/0209Cooling devices, e.g. using gaseous coolants
    • B21B45/0215Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/0224Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for wire, rods, rounds, bars

Abstract

A water injection head (1) sealingly connects two cooling tubes (2, 4) through which a water slide passes, and two separators (3, 5) connected to each of the tubes. The cooling tubes are arranged respectively upstream and downstream of the injection head, relative to the direction of travel of the product, the product and the water circulating cocurrently in the downstream tube (2) and against current in the upstream tube (4). The ratio of the flow rates in each of the tubes is controlled by adjusting a slot, provided in the injection head (1).
Application to the cooling of long products and to the heat treatment of bars and reinforcing bars.

Description

  • The invention relates to the field of heat treatments of rolled products and relates more particularly to a device for cooling long products in movement, in particular bars and concrete bars.
  • Such devices generally consist of a tube inside which the product and the coolant circulate, and the two ends of which are respectively equipped with a water supply, or injection head, and with a separator allowing avoid cooling water being entrained with the product at the outlet of the tube. In order to avoid the phenomena of heat build-up which, by local formation of vapor, reduce the efficiency of heat exchanges, water is injected under high pressure, so as to form a blade circulating at high speed. The product to be cooled is also driven at a high speed, the circulation of water is usually carried out in co-current, with the passage of the product, in order to avoid entrainment of water by the latter, quickly leading to stagnation of the liquid and therefore a deterioration of the heat exchanges by the formation of a vapor film. This phenomenon is particularly marked with concrete bars because of their high running speed and the fact that they are generally crenellated. However, it is well known that, in the case of a co-current circulation, the efficiency of the heat exchanges is less good than in that of a counter-current circulation and that it is therefore necessary to longer tube length or higher water flow for the same cooling.
  • The object of the present invention is precisely to provide improvements to devices of this type, in order to improve their performance.
  • To this end, the subject of the invention is a device for cooling long rolled products in movement, comprising a water injection head and two cooling tubes, traversed by a sheet of water, through which the product circulates. . The cooling tubes are tightly connected to the injection head respectively upstream and downstream of the latter, relative to the direction of travel of the product and are traversed by water blades of opposite directions, the product and the water circulating against the current in the upstream tube and co-current in the downstream tube. The injection head is provided with means for adjusting the ratio of the flows in the two tubes.
  • According to a characteristic of the device according to the invention, the head of injection consists of two coaxial tubular parts with conical socket delimiting between them an annular chamber for introducing water extended by an annular slot formed between two frustoconical bearing surfaces, and adjustable by sliding the parts one inside the other .
  • According to an advantageous embodiment of the device according to the invention, the coaxial pieces respectively constitute a body inside which is pierced a circular channel extended by a frustoconical recess followed by an annular recess then by a bearing and a frustoconical socket , pierced with a circular channel, externally comprising a cylindrical bearing which cooperates with the corresponding bearing of the body to ensure the sliding of the parts one inside the other, followed by a frustoconical bearing which delimits with the frustoconical recess the slot water introduction.
  • According to another characteristic of the device according to the invention, the slot is adjustable in length and in thickness by modifying the depth of engagement of the frustoconical sleeve in the body.
  • According to one embodiment of the invention, the depth of engagement of the two parts is adjusted by interposing thickness shims between an annular ring of the frustoconical part and a corresponding shoulder of the body.
  • According to another advantageous variant, the frustoconical sleeve has an annular ring provided with an internal thread which cooperates with an external thread of the body to ensure continuous adjustment of the depth of engagement by screwing or unscrewing.
  • The invention also relates to an installation for cooling long rolled products in movement comprising an injection head sealingly connecting two opposite cooling tubes arranged upstream and downstream of the latter and further comprising devices for separating the product and the water slide, arranged at each of the free ends of the cooling tubes.
  • Preferably, centralizers consisting of a tubular element, coaxial with the cooling tube, of internal diameter smaller than that of the tube and having peripheral channels formed in its thickness, are arranged in the cooling tubes.
  • As will be understood, the known cooling devices comprise an injection head constituted so as to send all the water in one direction, namely downstream relative to the direction of travel of the product, so as to ensure co-current circulation. However, these heads necessarily include an upstream orifice to allow the product to enter the cooling device. Must therefore prevent both an exit of the water through this orifice and an entry of air at the same time as the product, which would disturb the heat exchanges. To remedy these two phenomena, which are detrimental to the efficiency of cooling, it is possible in particular to provide an injection of secondary water of lower pressure, upstream of the main injection, so as to form a liquid curtain. This water is then entrained with that of the main circuit and participates in the cooling of the product.
  • The idea underlying the present invention is not to prevent water from exiting through the upstream orifice of the injection head, but, on the contrary, to favor this exit by modifying the head and using the "parasitic" jet by sending it to another cooling tube. The ratio of the flows in the two tubes is controlled by injection of water by means of an adjustable slot provided in the injection head. In the secondary tube, taking into account its arrangement relative to the injection head, the product and the water circulate against the current; its length must therefore be limited to avoid stagnation of the water, but due to the difference in speeds the cooling obtained is very effective. The product therefore enters the main tube already substantially cooled and, therefore, less likely to give rise to phenomena of calefaction. The presence of the two opposite tubes where the water circulates in opposite directions therefore makes it possible to improve the cooling efficiency, and thus, taking into account the desired final structure, to subject the product to a faster thermal law and to consume less of water.
  • The invention will in any case be clearly understood in the light of the description which follows, given by way of purely illustrative example with reference to the attached drawing boards in which:
    • - Figure 1 shows schematically the whole of a cooling installation,
    • FIG. 2 is a view in axial section of a first embodiment of the injection head,
    • - Figure 3 is an axial sectional view of another embodiment of the injection head.
  • In order not to overload the figures, the processed product has not been shown, but its scrolling direction is indicated by an arrow and, throughout the text, the concepts of upstream and downstream will be defined relative to this scrolling direction. In all the figures, identical elements are designated by the same references.
  • In FIG. 1, we can see at 1 the injection head, at 2 the downstream cooling tube, tightly connected to the latter and to the free end of which a separator 3 is disposed. The upstream cooling tube 4 also includes a separator 5 disposed at its free end, the other end being tightly connected to the injection head 1.
  • The cooling water enters the injection head 1 through the supply lines 6. Three of them are visible in this figure, but the supply could be carried out using a single line, or four or six, etc ... to ensure a better distribution, the arrivals can be balanced or voluntarily unbalanced to give the water a helical movement.
  • Inside the injection head 1, which will be described in more detail below, the water separates into two streams in opposite directions: a main stream downstream, a secondary stream with a lower flow rate, which is usually set at around 10-20% of the main flow, upstream.
  • The downstream current passes through the downstream tube at high speed and arrives in the separator 3 which ensures its evacuation. This separator 3 is identical to that described in French patent application No. 78 / 36,617 to which reference will be made for more details, if necessary. It essentially consists of a box comprising two opposite lateral openings in the extension of the tube 2 through which the product surrounded and its liquid envelope and the dried product arrive and exit respectively. A water inlet 7 makes it possible to produce in the box a jet perpendicular to the downstream current, so as to cause it to shear. The latter is facilitated by weakening of the current using deflectors arranged in the box. The water is discharged through the collector 8.
  • The upstream current passes through the tube 4, then is separated from the product and evacuated by means of the separator 5 and the collector 10. The separator 5 is identical to the separator 3, although of smaller dimensions, but the product enters there through the upstream orifice and leaves it through the downstream orifice to engage in the tube 4.
  • In order to ensure uniform cooling while preventing the product from coming into contact with the walls of the cooling tubes, the latter are provided with one or more centering devices 11, only one of which has been shown on the downstream tube in order to do not overload the figure unnecessarily. These devices are identical to those described in patent application No. 79 / 01.567 to which reference will be made if necessary. They essentially consist of a tubular element, coaxial with the cooling tube and of smaller internal diameter, having channels peripherals arranged in its thickness.
  • Figures 2 and 3 will be described simultaneously because they have essential differences only at the level of the adjustment means.
  • The injection head 1 consists essentially of two coaxial parts 12 and 13 fitted one inside the other and cooperating together to ensure the circulation and the adjustment of the cooling water flow rates. The part or socket 12 is pierced with a central cylindrical channel 14 for the passage of the product and the cooling water, and has an internal diameter slightly smaller than the internal diameter of the cooling tube 4, so as to be connected to this the latter, at its upstream end, forming a funnel. Its opposite end has a frustoconical surface 15 to which corresponds a frustoconical recess 16 of the body 13, of substantially equal taper. The frustoconical recess 16 is extended downstream by a cylindrical duct 17, of the same internal diameter as that of the cooling tube 2 and secured to the latter by means of a flange 18 fixed to the body 13 by the screws 19. Upstream, the recess 16 is extended by an annular recess 33 inside which open the conduits 6 for introducing the cooling water.
  • The frustoconical bearing surface 15 of the frustoconical sleeve 12 is extended, upstream, by a bearing surface 21 which cooperates with a corresponding bearing surface 22 of the body 13 to ensure the longitudinal sliding of the sleeve 12 in the body 13. The bearing surfaces 15 and 21 , according to the relative position of the parts 12 and 13, define with the annular recess 33 a chamber 20 for introducing water, opening downstream in an equally annular slot 23 delimited by the bearing surfaces 14 and 15. This slot communicates at its other end with the circular channels 14 and 17.
  • The pressurized water, arriving via the supply lines 6, therefore enters the introduction chamber 20, passes through the slot 23 and separates at the outlet into two streams of opposite directions, a main stream directed towards the downstream and a secondary current, of lesser flow, directed upstream. The flow rate of the downstream current is determined by the pressure drop between the introduction chamber 20 and the downstream end of the tube 2 which is at atmospheric pressure. Only the water "in excess" compared to the flow rate thus determined, goes upstream, therefore towards the cooling tube 4. This pressure drop can be varied by increasing or decreasing the internal diameter of the tube 2, but this requires significant modifications to the installation. It is therefore preferable to keep this diameter constant and to act upstream of the tube. For this, provision is made to be able to vary the dimensions of the slot 23 by modifying the position relative parts 12 and 13. By sliding the frustoconical sleeve 12 inside the body 13, it changes in effect simultaneously the thickness and the length of the slot and, therefore, the pressure drop. We can thus adjust the ratio of upstream and downstream flows in a fairly wide range of values and therefore precisely control the two cooling stages so as to impose on the product a chosen thermal law and thus obtain the final structure and mechanical properties. desired.
  • Different technological solutions can be envisaged for adjusting the dimensions of the slot. Two of them are illustrated, by way of example, in FIGS. 2 and 3.
  • In the embodiment corresponding to FIG. 2, the depth of engagement of the frustoconical sleeve 12 inside the body 13 is adjusted by means of shims such as 24, of different thicknesses, interposed between the internal wall of an annular ring 25, adjacent to the bearing 21, provided on the sleeve 12 and a corresponding shoulder 26 of the body 13. The assembly is held in position by tightening by means of an external flange 27 fixed to the body 13 by the screws 28. O-rings are provided wherever necessary to seal the assembly.
  • This embodiment is of very simple design, but it has the disadvantage of requiring disassembly and a change of shim each time that one wants to modify the dimensions of the slot.
  • The variant shown in Figure 3, more elaborate, allows to obtain a continuous variation and a finer adjustment without requiring disassembly. For this, the annular ring 25 of the first embodiment is replaced by a ring 29 having on its internal face a thread 30 which cooperates with a thread 31 of the external wall of the body 13. By screwing and unscrewing, one can vary in continuous the depth of engagement of the frustoconical sleeve 12 inside the body 13. The two parts are held in the chosen position by locking screws such as 32.
  • Advantageously, the tube 4 consists of two parts fitted one inside the other, a short length portion 34 secured to the frustoconical sleeve 16 and able to slide inside the rest of the tube, so as to be able to make vary the dimensions of the slot by acting only on the frustoconical sleeve 12, without affecting the rest of the installation.
  • The invention is not limited in its scope to the examples described, in particular as regards the adjustment means and the means for maintain the relative position of the frustoconical sleeve relative to the body. It is of general application to any long product running, but is particularly advantageous for concrete bars and rods whose final metallographic structure must be well controlled to give them the desired mechanical characteristics.

Claims (10)

1. A device for cooling long rolled products in movement comprising a water injection head and two cooling tubes, traversed by a sheet of water, through which the product circulates, device characterized in that the cooling tubes are tightly connected to the feed head, respectively upstream and downstream of said head, relative to the direction of travel of the product, and are traversed by water slides in opposite directions, the product and the water flowing against the current in the upstream tube and co-current in the downstream tube, and in that the injection head is provided with means for adjusting the ratio of the flows in the two tubes.
2. Device according to claim 1, characterized in that the injection head consists of two coaxial tubular parts with conical fitting delimiting between them an annular chamber for introducing water extended by an annular slot formed between two frustoconical bearing surfaces , and adjustable by sliding said pieces one inside the other.
3. Device according to claim 2, characterized in that the coaxial parts are respectively a body inside which is pierced a circular channel extended by a frustoconical recess followed by an annular recess then of a cylindrical bearing and a frustoconical sleeve , pierced by a central circular channel, externally comprising a cylindrical bearing which cooperates with the corresponding bearing of the body to ensure the sliding of the parts one inside the other, followed by a frustoconical bearing which delimits, with the frustoconical recess of the body, the water introduction slot.
4. Device according to claim 3, characterized in that the annular chamber for the introduction of water is delimited by the annular recess of the body and by the cylindrical and frustoconical bearing surfaces of the frustoconical part.
5. Device according to claim 3, characterized in that the water introduction slot is adjustable in thickness and in length by adjusting the depth of engagement of the frustoconical part in the body.
6. Device according to claim 5, characterized in that the depth of engagement of the parts one in the other is adjusted by the interposition of shims between an annular ring of the sleeve and a corresponding shoulder of the body.
7. Device according to claim 6, characterized in that the assembly constituted by the body and the sleeve is held in place by tightening. between two annular flanges.
8. Device according to claim 5, characterized in that the frustoconical sleeve has an annular ring provided with an internal thread which cooperates with an external thread of the body to ensure continuous adjustment of the depth of engagement by screwing or unscrewing.
9. Installation for cooling long rolled products in movement comprising an injection head and two cooling tubes according to claims 1 to 8, characterized in that it further comprises devices for separating the product and the blade. water arranged at each of the free ends of the cooling tubes.
10. Installation according to claim 9, characterized in that at least one centralizer constituted by a tubular element coaxial with the cooling tube, of internal diameter smaller than that of the tube, having peripheral channels formed in its thickness, is disposed in at least one of the cooling tubes.
EP19800400715 1979-06-01 1980-05-21 Cooling device for hot rolled elongate laminated products Expired EP0020246B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR7914383A FR2457724B1 (en) 1979-06-01 1979-06-01
FR7914383 1979-06-01

Publications (2)

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EP0020246A1 true EP0020246A1 (en) 1980-12-10
EP0020246B1 EP0020246B1 (en) 1985-02-13

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ID=9226250

Family Applications (1)

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EP19800400715 Expired EP0020246B1 (en) 1979-06-01 1980-05-21 Cooling device for hot rolled elongate laminated products

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EP (1) EP0020246B1 (en)
DE (1) DE3070144D1 (en)
FR (1) FR2457724B1 (en)
MY (1) MY8600748A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2522688A1 (en) * 1982-03-03 1983-09-09 Siderurgie Fse Inst Rech Process and installation for thermally processing alloy steel bars ready for use, in particular for mechanical construction
FR2585368A1 (en) * 1985-07-29 1987-01-30 Thaelmann Schwermaschbau Veb Method and device for manufacturing a concrete round
ES2109123A1 (en) * 1993-02-09 1998-01-01 C V G Siderurgia Del Orinoco C Method and apparatus for cooling workpieces
CN104088910A (en) * 2014-07-15 2014-10-08 中冶南方(武汉)威仕工业炉有限公司 Combined sealing device for furnace roller bearing of cold rolling annealing furnace

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1421811A (en) * 1964-01-13 1965-12-17 Morgan Construction Co Method and cooling apparatus set to a wire rod rolling mill
FR1456522A (en) * 1964-06-15 1966-10-28 Southwire Co An apparatus and method for winding bars
FR1508729A (en) * 1964-11-12 1968-01-05 Southwire Co Hot forming of metals
FR1584095A (en) * 1968-07-10 1969-12-12
DE1925416A1 (en) * 1968-03-12 1970-11-26 Walter Krenn Cooling rolled wire
FR2267165A1 (en) * 1974-04-10 1975-11-07 Florin Stahl Walzwerk
FR2298378A1 (en) * 1975-01-27 1976-08-20 Southwire Co Generator adjustable flow of fluid used in particular to be stripped of metal rods
US4136544A (en) * 1976-08-31 1979-01-30 Showa Electric Wire & Cable Co., Ltd. Cooling tubes for wire stocks
EP0013230A1 (en) * 1978-12-26 1980-07-09 INSTITUT DE RECHERCHES DE LA SIDERURGIE FRANCAISE (IRSID) France Device for removing a fluid from the surface of a long and continuously moving product
EP0014140A1 (en) * 1979-01-19 1980-08-06 INSTITUT DE RECHERCHES DE LA SIDERURGIE FRANCAISE (IRSID) France Device for cooling a longitudinally moving elongated product

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1421811A (en) * 1964-01-13 1965-12-17 Morgan Construction Co Method and cooling apparatus set to a wire rod rolling mill
FR1456522A (en) * 1964-06-15 1966-10-28 Southwire Co An apparatus and method for winding bars
FR1508729A (en) * 1964-11-12 1968-01-05 Southwire Co Hot forming of metals
DE1925416A1 (en) * 1968-03-12 1970-11-26 Walter Krenn Cooling rolled wire
FR1584095A (en) * 1968-07-10 1969-12-12
FR2267165A1 (en) * 1974-04-10 1975-11-07 Florin Stahl Walzwerk
FR2298378A1 (en) * 1975-01-27 1976-08-20 Southwire Co Generator adjustable flow of fluid used in particular to be stripped of metal rods
US4136544A (en) * 1976-08-31 1979-01-30 Showa Electric Wire & Cable Co., Ltd. Cooling tubes for wire stocks
EP0013230A1 (en) * 1978-12-26 1980-07-09 INSTITUT DE RECHERCHES DE LA SIDERURGIE FRANCAISE (IRSID) France Device for removing a fluid from the surface of a long and continuously moving product
EP0014140A1 (en) * 1979-01-19 1980-08-06 INSTITUT DE RECHERCHES DE LA SIDERURGIE FRANCAISE (IRSID) France Device for cooling a longitudinally moving elongated product

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2522688A1 (en) * 1982-03-03 1983-09-09 Siderurgie Fse Inst Rech Process and installation for thermally processing alloy steel bars ready for use, in particular for mechanical construction
EP0090682A2 (en) * 1982-03-03 1983-10-05 Institut De Recherches De La Siderurgie Francaise (Irsid) Heat treating method and apparatus for making rods of alloy steel ready for use
EP0090682A3 (en) * 1982-03-03 1987-09-02 Institut De Recherches De La Siderurgie Francaise (Irsid) Heat treating method and apparatus for making rods of alloy steel ready for use
FR2585368A1 (en) * 1985-07-29 1987-01-30 Thaelmann Schwermaschbau Veb Method and device for manufacturing a concrete round
ES2109123A1 (en) * 1993-02-09 1998-01-01 C V G Siderurgia Del Orinoco C Method and apparatus for cooling workpieces
CN104088910A (en) * 2014-07-15 2014-10-08 中冶南方(武汉)威仕工业炉有限公司 Combined sealing device for furnace roller bearing of cold rolling annealing furnace

Also Published As

Publication number Publication date
FR2457724B1 (en) 1983-05-13
DE3070144D1 (en) 1985-03-28
MY8600748A (en) 1986-12-31
EP0020246B1 (en) 1985-02-13
FR2457724A1 (en) 1980-12-26

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