EP0704664B1 - Four de réchauffage, de maintien et d'accumulation de produits sidérurgiques - Google Patents

Four de réchauffage, de maintien et d'accumulation de produits sidérurgiques Download PDF

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Publication number
EP0704664B1
EP0704664B1 EP95402131A EP95402131A EP0704664B1 EP 0704664 B1 EP0704664 B1 EP 0704664B1 EP 95402131 A EP95402131 A EP 95402131A EP 95402131 A EP95402131 A EP 95402131A EP 0704664 B1 EP0704664 B1 EP 0704664B1
Authority
EP
European Patent Office
Prior art keywords
longitudinal members
support
products
beams
transport
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP95402131A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0704664A1 (fr
Inventor
Didier Brun
François Pahmer
Jean-Claude Audebert
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.)
Fives Stein SA
Original Assignee
Stein Heurtey SA
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 Stein Heurtey SA filed Critical Stein Heurtey SA
Publication of EP0704664A1 publication Critical patent/EP0704664A1/fr
Application granted granted Critical
Publication of EP0704664B1 publication Critical patent/EP0704664B1/fr
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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
    • 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
    • B21B1/46—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 metal immediately subsequent to continuous casting
    • B21B1/466—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 metal immediately subsequent to continuous casting in a non-continuous process, i.e. the cast being cut before rolling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
    • F27B9/201—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace walking beam furnace
    • F27B9/202—Conveyor mechanisms therefor

Definitions

  • the present invention relates to a reheating, holding, and accumulating products steelworks.
  • Flat and long products treated in hot rolling mills to form sheets, strips, beams, bars, etc ... are more and more frequently made from steel liquid contained in a pocket and continuously poured into a mold followed by rollers which make it possible to extract the shape obtained by controlled cooling of steel just enough to change from liquid metal to the solid form, the semi-product thus obtained at output continuous casting is usually at a temperature higher than 1000 ° C.
  • the high temperature of the semi-finished product its rolling as soon as it leaves the casting represents a substantial energy saving by compared to the classic process which consists in storing semi finished products before heating them up 1250 ° C to be able to laminate them.
  • the displacement from the oven to the oven is controlled from way to either accumulate the steel products in the first zone defined by the first group of beams of support either to make them cross this area too quickly as possible to feed the rolling mill and create an available space in the oven to store it possibly products from continuous casting if the rolling mill stops.
  • DE-C-653 956 describes a device for the continuous transport of products, in particular of sheets, in continuous ovens, on one level using two groups of mobile spars alternately taking the products and describing a rectangular movement, the arrangement being such that one of the groups of mobile side members take the product from the other group and transfer it when precise where it begins or ends the horizontal advance movement.
  • the disadvantage of the installations described in the prior art lies in the limitation transfer speed which cannot be equal to or less than the cycle time and the possible travel of the transport beams.
  • These transport beams follow a rectangular cycle with a total duration of the order of 40 seconds or more, comprising a first ascent phase which frees the side members from support, a second phase of horizontal transport then, a third phase of deposit of the products which have thus progressed by one step on the support beams before the fourth phase of going back to the initial position; we see that during phases one, three and four the products do not move, so only the quarter of the cycle is active in terms of product progression inside the oven and otherwise the step or translation in the horizontal plane of the transport beams is limited to generally less than 0.6 m due to the combination necessary vertical and horizontal movements of the mechanical.
  • This limitation can constitute a serious handicap as long as in terms of the furnace's production capacity than its ability to free up sufficient space in the oven to store products from casting if the stop was longer than expected or longer than usual.
  • the slow speed of product transfer through the storage area speed which represents an advantage when the products in the oven are practically cold, is a disadvantage when the semi products arrive directly from the continuous casting because it forces this area to be kept at a temperature high to avoid cooling of the products before their entry into the heating zone.
  • This high maintenance temperature is a handicap both in terms of energy only for the environment because in normal times the products from continuous casting must come out the most quickly possible in reheating zone or even homogenization and consequently the area of storage is empty.
  • the present invention proposes to overcome these disadvantages in providing a satisfactory answer while both of the transfer speed problem of products and that of high temperature maintenance of the storage area by taking advantage of the fourth phase of turning back the side members of transport to advance the products in the oven as will be seen in the device which follows.
  • the invention relates to a storage, reheating and maintenance oven for steel products including a storage area, a heating area and a holding zone, provided with side members connecting, in the transverse direction, a charging zone and charging zone, the heating and cooling zones support comprising fixed product support beams and beams transport placed at a certain distance from said fixed support rails, said transport beams being driven in a translational movement horizontal and a lifting movement relative to the side rails of fixed support, characterized in that said storage area includes support beams independent of the oven bottom and moved in a alternative horizontal travel and mobile transport rails, same type as the transport beams of the reheating and holding.
  • the oven object of the present invention has two or more areas of storage, reheating and maintenance.
  • the oven has a so-called zone storage which should normally remain available to receive the casting products in the event of the rolling mill, a heating zone, and a zone homogenization before charging.
  • the areas of reheating and homogenization are designed as the conventional reheating ovens with side members 2 so-called mobile or support beams 1 so-called fixed, the four-phase cycle described in the art front allows the mobile side members 2 to transport of one step per cycle the products of the entry of the zone from reheating to reheating at speeds generally varying from 0.9 m / min to 0.3 m / min or less.
  • the storage area includes transport beams 2 integral with a structure 4 as produced in the reheating and homogenization zones and one or two support beam groups 1 which, unlike of a usual oven, are not integral with the sole 3 fixed from the oven or as described in the patent previously cited.
  • the oven object of the invention has a structure 5 comprising a plurality of support beams 1, independent of the bottom 3 of the oven and capable of horizontal forward movement or the back.
  • These groups of support beams 1 submitted only at a horizontal translation can have a stroke of 1m or more depending on the power requirements of the oven, this horizontal movement takes place with the load during phase four of the return of the beams of transport 2, which allows products to be moved from no support beams 1 linked to the structure 5 by example 1 m, this step being added to that of for example 0.6 m carried out thanks to phase two of the beams of transport 2 linked to structure 4.
  • Transport speed through the storage area is thus multiplied at least by 2.66 in this example reducing the residence time in the same proportion, under these conditions it becomes useless to maintain at high temperature storage area in production normal, we can be satisfied with its maintenance in temperature by the fumes from the zones of reheating and homogenization going to the conduits leading to the product evacuation chimney combustion of the oven.
  • the product P has been loaded by a means usual in reheating ovens at the entrance of the oven on the group of support beams 1 which is in position rear relative to the fixed support rails 6 of following zones, the group of support beams 1 is moves forward a full step A (in Example 1 m) during (figure 2) the mobile transport beams 2 move in opposite directions under the load P, from the value of a step B (in the example 0.6 m).
  • transport beams 2 move vertically upwards by freeing the groups of spars from support 1 of their product load P which rests now on the longitudinal members 2 which advance by a step B (0.6 m) while ( Figure 4) the spar groups support 1 take a step back A (1 m) to return to their initial position.
  • Transport beams 2 arrived at the horizontal end of travel will move vertically downwards, resting the load P on the support rails 1 ( Figure 5). the charge P therefore has increased forward by the cumulative value of steps A (figure 1) and B (figure 3) during a rectangular cycle complete with transport beams 2.
  • This progression cumulating the steps A + B continues until the product P reaches the next zone that is to say the groups of beams of support 6 which are fixed. From the moment the product P is on the groups of support beams 6 it is transported to the racking by the cycle normal rectangular transport beams 7, so at a speed corresponding to the single step 7 which is usually equal to the pitch of the first group of beams transport 2 (in the example 0.6 m).
  • the speed of movement of products in the storage allows it to be empty in normal times, if the rolling mill stops, the group system support beams 1 remain in a fixed position, the products are transported from the oven to the not the transport beams 2, the progression is one step B in each cycle, depending of the production required the cycles are linked (all 40 s in the example) to free a space at charging for a product coming from the casting continuously, or are separated by a downtime which can be several minutes giving speeds of displacement of the order of 0.3 m / min or less.
  • the time spent in the storage area must be set profit to preheat the product before its arrival in reheating zone, the speed of movement of products must therefore be modulated what we will get in increasing downtime between two successive cycles and by varying the step A from 0 m to the maximum step A (1 m in the example) as well as the pitch of the side members transport from 0 m to B (0.6 in the example).
  • the present invention is not not limited to the embodiments described and shown above, but that it includes all variants. So, in the usual cases of casting feeds to a hot rolling mill through a storage and heating furnace, homogenization, seems sufficient to equip only one zone with groups of support beams with translational movement horizontal, it can perfectly be conceivable, for flexibility or feeding reasons since multiple flows for example, that two or all furnace areas may have such groups of support rails. We can also take into account operating conditions which make necessary the product return easily obtained by reversing the previously described order of movements and in using the horizontal return cycle of the beams of support on which the products resting while the transport beams, in the low position, progress forward.
EP95402131A 1994-09-27 1995-09-21 Four de réchauffage, de maintien et d'accumulation de produits sidérurgiques Expired - Lifetime EP0704664B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9411527 1994-09-27
FR9411527A FR2725016B1 (fr) 1994-09-27 1994-09-27 Four de rechauffage, de maintien et d'accumulation de produits siderurgiques

Publications (2)

Publication Number Publication Date
EP0704664A1 EP0704664A1 (fr) 1996-04-03
EP0704664B1 true EP0704664B1 (fr) 2000-11-29

Family

ID=9467321

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95402131A Expired - Lifetime EP0704664B1 (fr) 1994-09-27 1995-09-21 Four de réchauffage, de maintien et d'accumulation de produits sidérurgiques

Country Status (8)

Country Link
US (1) US5607144A (ja)
EP (1) EP0704664B1 (ja)
JP (1) JP3799085B2 (ja)
BR (1) BR9504193A (ja)
CA (1) CA2159164C (ja)
DE (2) DE69519502T2 (ja)
ES (1) ES2084574T3 (ja)
FR (1) FR2725016B1 (ja)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0825267A3 (en) * 1996-08-23 1998-06-17 DANIELI & C. OFFICINE MECCANICHE S.p.A. Furnace for coils
FR2779742B1 (fr) * 1998-06-11 2000-08-11 Stein Heurtey Perfectionnements apportes aux fours de rechauffage de produits siderurgiques
WO2007022496A2 (en) * 2005-08-19 2007-02-22 Icon Medical Corp. Medical device deployment instrument

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE653956C (de) * 1932-01-14 1937-12-17 Emil Diehl Dipl Ing Vorrichtung zum ununterbrochenen Foerdern von insbesondere blechfoermigem Gluehgut in Durchlaufoefen
GB1428293A (en) * 1973-01-24 1976-03-17 Nippon Steel Corp Heating furnace of the walking beam type
FR2431445A1 (fr) * 1978-07-18 1980-02-15 Lucas Raymond Dispositif d'entrainement des charges sur des convoyeurs, notamment a rouleaux libres
US4229878A (en) * 1978-11-30 1980-10-28 Chugairo Kogyo Kaisha Ltd. Method of operating a reheating furnace in a hot rolling line and a reheating furnace employed therefor
JPS6056013A (ja) * 1983-09-06 1985-04-01 Kawasaki Steel Corp 分割型ウォ−キングビ−ム式加熱炉の操炉制御方法
IT1216700B (it) * 1988-04-01 1990-03-08 Pomini Farrel S P A Castellanz Forno di riscaldamento, mantenimento ed accumulo diprodotti siderurgici.
IT1227500B (it) 1988-11-25 1991-04-12 Heurtey Italiana Spa Forno di riscaldo, mantenimento ed accumulo di prodotti siderurgici.
US5314169A (en) * 1992-08-26 1994-05-24 A. C. Leadbetter & Son, Inc. Method and apparatus for heat treating elongate metallic products

Also Published As

Publication number Publication date
CA2159164C (fr) 1999-10-19
ES2084574T1 (es) 1996-05-16
DE69519502D1 (de) 2001-01-04
DE69519502T2 (de) 2001-08-02
JP3799085B2 (ja) 2006-07-19
FR2725016B1 (fr) 1997-01-17
CA2159164A1 (fr) 1996-03-28
BR9504193A (pt) 1996-08-06
DE704664T1 (de) 1996-10-10
JPH08170117A (ja) 1996-07-02
US5607144A (en) 1997-03-04
EP0704664A1 (fr) 1996-04-03
ES2084574T3 (es) 2001-02-01
FR2725016A1 (fr) 1996-03-29

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