EP0825267A2 - Furnace for coils - Google Patents
Furnace for coils Download PDFInfo
- Publication number
- EP0825267A2 EP0825267A2 EP97113138A EP97113138A EP0825267A2 EP 0825267 A2 EP0825267 A2 EP 0825267A2 EP 97113138 A EP97113138 A EP 97113138A EP 97113138 A EP97113138 A EP 97113138A EP 0825267 A2 EP0825267 A2 EP 0825267A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- coils
- furnace
- coil
- outlet
- positioning stations
- 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.)
- Withdrawn
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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
-
- 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
Definitions
- This invention concerns a furnace for coils as set forth in the main claim.
- the invention is applied in rolling lines between the roughing train and the finishing train in order to temporarily store the coils which are to be sent to the finishing process to maintain them and/or bring them to a temperature suitable for rolling on the strip finishing train.
- the furnace for coils according to the invention is applied in rolling lines where one or more casting lines are connected directly to the roughing train and feed it in a substantially continuous sequence.
- the furnace for coils according to the invention is applied advantageously, but not only, in continuous rolling lines which include the welding of the trailing end of the coil which is already being rolled to the leading end of the following coil which is next to be rolled.
- the state of the art covers rolling lines which include at least one heating and/or maintenance furnace, located between the roughing train and the finishing train, with the function of restoring and/or maintaining the temperature of the transfer bars wound in coils which have been produced by the roughing train.
- furnaces include a substantially closed, insulated structure, with heating means inside and at least an aperture connected to feeding/discharge ways for the entrance/exit of the coils to be stored/stored.
- This structure is associated inside with means to move the coils which cooperate with a plurality of positioning stations located lengthwise in sequence, each of which is suitable to temporarily support a single coil.
- each positioning station can include supporting rolls which, apart from supporting the coil, have the function of maintaining it continually in rotation, both in order to ensure uniformity in the surface distribution of the heat, and also to prevent the formation of surface marks or scratches.
- the positioning stations include stationary saddles on which the coils are progressively rested as they are fed into the furnace.
- These moving means allow the coils to be moved step by step from one station to the next, lifting them all together from their positioning station and lowering them onto the following positioning station.
- This movement is therefore only suitable for a limited heating of the coil but it is absolutely not possible to use it to create a "buffer store" between the roughing train and the finishing train, particularly in those cases where the finishing train becomes blocked while the roughing train connected to the continuous casting continues to produce, given the need to prevent the casting itself from becoming blocked.
- At least the upper part of the trolley must be housed, and must move, inside the furnace, inside which there are extremely high temperatures, and also the furnace must have in its lower part a slot which will allow the means to lift and translate the coil, which are present on the trolley, to enter, lift the coil, translate it, place it in the next station and then leave the furnace.
- the purpose of the invention is to provide a furnace for coils, installed in a rolling line, suitable to make the coils immediately available as they leave the furnace, irrespective of the presence/absence of other coils entering the furnace and/or without the different stations of the furnace needing to be completely occupied by coils.
- a further purpose of the invention is to obtain a furnace which, installed between the roughing train and the finishing train in a rolling line, can function as a buffer store in the event that there is a temporary blockage in the finishing train, thus allowing the continuous casting to continue producing without slowdowns or stoppages in the line.
- a further purpose of the invention is to obtain a system which ensures great reliability, long duration, little maintenance, reduced or zero heat losses and yet other advantages.
- the furnace for coils according to the invention includes a containing structure substantially of the type known to the state of the art, insulated, having heating means and cooperating with at least a feeder way/discharge way for the coils, associated with the rolling line by means of at least one feeder way/discharge way for the said coils.
- These support means are composed of rotary supporting rolls.
- the support means are composed of stationary supporting saddles.
- the positioning stations are associated at the lower part with means to lift and move the coils step by step, known as walking beams, which make it possible to displace the coils from one station to another.
- These lifting and moving means are capable of an alternate movement which allows them to lift in a single action all the coils inside the furnace, lower them onto the following station and then re-position them in the starting position.
- the support means whether they be supporting rolls or supporting saddles, have at least two working positions, respectively the first lowered position and the second raised position.
- the second raised position takes the coils to a position of no-contact with the lifting and moving means in such a way that the coils which have been raised are not moved even when the lifting and moving means are activated.
- the furnace can therefore be used as a buffer store in a rolling line connected to a continuous casting machine where the stoppages of the finishing train are absorbed by the furnace, which can be filled with all the coils as they are produced, without the continuous casting having to be stopped upstream.
- the coils are all stored in sequence towards the outlet, which reduces the downtimes of the cycle.
- all the support means of the furnace are able to assume, independently of each other, the above-mentioned first lowered and second raised working positions.
- only a desired number of positioning stations, located near the outlet of the furnace, have support means which are able to assume the said first lowered and second raised working positions.
- the furnace 10 for coils 11 according to the invention is used, in a rolling line which is not shown here, between the roughing train and the finishing train, to heat and/or maintain the temperature of the coils 11 leaving the roughing train before the coils 11 are sent to the finishing train.
- the furnace 10 is used also to store the coils 11 temporally, keeping them at the appropriate temperature, in the event of stoppages in the downstream finishing train due to maintenance, replacement of the rollers, blockages etc.
- the furnace 10 has an inlet 25 with shutter means 13a which can be temporally activated, and an outlet 26 with shutter means 13b which can be temporally activated which associate the furnace respectively with a roller way 12a to feed the coils 11 and a roller way 12b to discharge the coils 11.
- the furnace 10 has seven positioning stations 14, arranged in a series along the length of the furnace 10 so as to define a transit channel 15 with which the lifting and moving means 24 to lift and move the coils 11 cooperate.
- Each of these positioning stations 14 is suitable to support a single coil 11 and has an opposed pair of support means 118, in this case of the roll type 18, which also have the function of maintaining the coils 11 in continual rotation.
- Fig.1 where the first positioning station 14 is the one next to the inlet 25, shows only the supporting rolls 18 relating to the last positioning station 14 and the fifth positioning station 14.
- the coila 11 are fed to and discharged from the furnace 10 by means of the lifting and moving means 24, which also transfer the coils 11 from one positioning station 14 to the other.
- these lifting and moving means 24, or walking beams are composed of a movable beam 16, which is able to move axially with an alternated movement along the transit channel 15 of the furnace 10, by means of wheels 17 which cooperate with the resting plane 19.
- the movable beam 16 has means 20 to lift/lower the coils 11, in this case composed of oscillating arms 21 associated with a blade element 22 with, on the upper part, saddle elements 23.
- the saddle elements 23 assume two extreme positions, respectively a first resting position 23a (Figs. 2 and 3) and a second operating position 23b (Figs. 4 and 5).
- the saddle elements 23 are inactive as they are not in contact with the coils 11.
- the saddle elements 23 lift the coils 11 from the rollerway 12a to feed the coils 11 and/or from the pair of rolls 18 of the relative positioning station 14. Once the coils 11 have been lifted, they are translated by means of the movable beam 16 in correspondence with the following positioning station 14, or if necessary onto the rollerway 12b to discharge the coils 11, and lowered until they again rest on the relative rolls 18.
- the supporting rolls 18 of at least some of the positioning stations 14 of the furnace 10 can have at least two working positions, respectively a first, lowered position 18a and a second, raised position 18b.
- the first, lowered position 18a (Figs. 1-4) allows the saddle elements 23, when they are in their working position 23b, to lift the coil 11 and to move it from one positioning station 14 to another.
- the second, raised position 18b (Fig.5) takes the coil 11 to a higher level than that reached by the saddle elements 23 in their operating position 23b and therefore the coil 11 does not come into contact with the lifting and moving means 24.
- the embodiment according to the invention makes it possible to reduce to a minimum, according to the times of the cycle, the number of coils 11 normally present inside the furnace 10, and therefore increase the capacity of the furnace 10 as a buffer store.
- Figs. 6a-6g there is the illustration of a possible cycle to store the coils 11 inside the furnace 10 according to the invention during a temporary stoppage of the finishing train.
- This first positioning station 14 and also all the remaining positioning stations 14 of the furnace 10 have their rollers 18 in a lowered position 18a and therefore the lifting and moving means 24 can progressively transfer the coil 11 towards the outlet 26 step by step.
- a new coil 11b (Fig.6b) is fed from the rollerway 12a and this new coil 11b is moved towards the outlet 26 of the furnace 10 at the same time as the coil 11a.
- the lifting and moving means 24 are able to continue to move the coil 11c and the new coil 11d (Figs. 6f, 6g) towards the outlet 26 of the furnace 10 without coming into contact with the coils 11a and 11b.
- the rolls 18 are taken back to the lowered position 18a and thus it is possible to discharge the coil 11a onto the rollerway 12b to discharge the coils 11, and also it is possible for the other coils 11b, c, d to move towards the outlet 26.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Tunnel Furnaces (AREA)
- Winding, Rewinding, Material Storage Devices (AREA)
Abstract
Description
- Fig.1
- shows a longitudinal view, partly in section, of a furnace for coils according to the invention in its operating position;
- Fig.2
- shows a partial view of the furnace of Fig.1 in another operating position
- Fig.3
- shows a section along the line I-I of Fig.1;
- Fig.4
- shows a section along the line II-II of Fig.2;
- Fig.5
- shows a section along the line III-III of Fig.1;
- Figs.6a-6g
- shows in diagram form a possible working cycle of the furnace of Fig.1.
Claims (3)
- Furnace for coils installed in a rolling line for wide plate or sheet in an intermediate position between the roughing train and the finishing train, the furnace having at least one inlet (25) and at least one outlet (26) respectively associated with a way (12a) to feed the coils (11) and a way (12b) to discharge the coils (11), the furnace being defined inside by a plurality of positioning stations (14) defining a substantially central transit channel (15) cooperating at the lower part with means (24) to lift and move the coils (11) step by step between the positioning stations (14), each of the positioning stations (14) comprising support means (118), the furnace being characterised in that the support means (118) of at least a desired number of positioning stations (14) located towards the outlet (26) of the furnace (10) include at least a first, lowered working position (18a) where the lifting and moving means (24) cooperate with the coils (11), and a second, raised working position (18b) where the coils (11) are in a position of no-contact with the lifting and moving means (24) irrespective of the position assumed by said means (24).
- Furnace for coils as in Claim 1, in which the support means (118) are composed of opposed supporting rolls (18) rotating in a coordinated manner.
- Furnace for coils as in Claim 1, in which the support means (118) are composed of stationary supporting saddles.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITUS960164 | 1996-08-23 | ||
ITUS960164 | 1996-08-23 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0825267A2 true EP0825267A2 (en) | 1998-02-25 |
EP0825267A3 EP0825267A3 (en) | 1998-06-17 |
Family
ID=11423101
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97113138A Withdrawn EP0825267A3 (en) | 1996-08-23 | 1997-07-30 | Furnace for coils |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP0825267A3 (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR819126A (en) * | 1936-03-13 | 1937-10-11 | Method and apparatus for hot rolling of metals | |
DE2613459A1 (en) * | 1976-03-30 | 1977-10-13 | Schloemann Siemag Ag | Arrangement for avoiding scrap in a rolling mill - for wide strip material, during break down of the prodn. line and/or the strip winding arrangement |
WO1993000179A1 (en) * | 1991-06-26 | 1993-01-07 | Mannesmann Ag | Intermediate storage oven downstream of a thin slab casting plant |
EP0704664A1 (en) * | 1994-09-27 | 1996-04-03 | STEIN HEURTEY, Société Anonyme: | Furnace for reheating, holding and storing of metallurgical products |
IT1262226B (en) * | 1993-10-29 | 1996-06-19 | Danieli Off Mecc | Furnace for coils |
-
1997
- 1997-07-30 EP EP97113138A patent/EP0825267A3/en not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR819126A (en) * | 1936-03-13 | 1937-10-11 | Method and apparatus for hot rolling of metals | |
DE2613459A1 (en) * | 1976-03-30 | 1977-10-13 | Schloemann Siemag Ag | Arrangement for avoiding scrap in a rolling mill - for wide strip material, during break down of the prodn. line and/or the strip winding arrangement |
WO1993000179A1 (en) * | 1991-06-26 | 1993-01-07 | Mannesmann Ag | Intermediate storage oven downstream of a thin slab casting plant |
IT1262226B (en) * | 1993-10-29 | 1996-06-19 | Danieli Off Mecc | Furnace for coils |
EP0704664A1 (en) * | 1994-09-27 | 1996-04-03 | STEIN HEURTEY, Société Anonyme: | Furnace for reheating, holding and storing of metallurgical products |
Also Published As
Publication number | Publication date |
---|---|
EP0825267A3 (en) | 1998-06-17 |
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