CA2310411A1 - Coil box oven - Google Patents
Coil box oven Download PDFInfo
- Publication number
- CA2310411A1 CA2310411A1 CA002310411A CA2310411A CA2310411A1 CA 2310411 A1 CA2310411 A1 CA 2310411A1 CA 002310411 A CA002310411 A CA 002310411A CA 2310411 A CA2310411 A CA 2310411A CA 2310411 A1 CA2310411 A1 CA 2310411A1
- Authority
- CA
- Canada
- Prior art keywords
- coil
- saddle
- box furnace
- coil box
- furnace according
- 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.)
- Abandoned
Links
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
- C21D9/52—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
-
- 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
- C21D9/68—Furnace coilers; Hot coilers
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Induction Heating (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Winding, Rewinding, Material Storage Devices (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
Abstract
The invention relates to a coilbox oven comprising a heating device for reheating a coil (3, 3') to a rolling temperature and a saddle (4') which receives the coil (3, 3') that is to be reheated. The saddle (4') is provided with two bearing surfaces (10, 11) tangentially supporting the outer periphery of the coil in order to ensure that the intermediately stored coil (3, 3') is uniformly heated wherever possible to a rolling temperature with a view to minimising the final thickness tolerances dependent on temperature.
Description
SI/cs 97689W0 13 November 1998 COIL BOX FURNACE
The invention relates to a coil box furnace having a heating system for repeating a coil to rolling temperature and a saddle for receiving the coil to be repeated.
The cost optimisation of the production of hot strip is increasingly forcing the use of peripheral systems to minimise rejects of material. These include more particularly systems by means of which a preliminary strip situated on the processing line can be so preserved if any fault occurs, that when the fault has been eliminated the said strip can be reintroduced into the processing line for the continuation of production.
A coil box situated at the inlet to a finishing step enables the preliminary strip to be buffered in time prior to introduction to the finishing step, the time being approximately ten minutes for soft steel qualities.
Such an arrangement of a coil box is known, for example, from DE-OS 2 256 030. However, stainless steels, which can be rolled only within a narrow temperature range, do not offer these reserves, so that if disturbances occur for several minutes such preliminary strips are deposited as coil, but have not hitherto been successfully reintroduced into the rolling line.
It is know from EP 0 734 793 A1 to provide coil boxes upstream and downstream of a reversing stand. It is also known from that citation to provide a furnace in which the strip is repeated after passing through the reversing stand. The provision of a repeating furnace at the coil box enables the aforementioned problems to be obviated, since the coil box preliminary strips occurring are heated to rolling temperature and reintegrated into the rolling process.
One prior art coil box furnace takes the form of a chamber furnace having a fixed and a moveable casing part. The moveable casing part has an eletromechanical drive and can be moved on wheels over rails. The furnace is heated via meandering heating conductors, which are installed at the four side walls of the furnace and combined into individual control groups. The receiving saddle for the coil, which has the shape of a segment of a circle and has no extra heating, stands on a base plate of refractory concrete and a frame of creep resistant steel (cf. Fig. 1).
However, with this prior art coil box furnace considerable periodic changes in temperature were discovered in the preliminary strip reintroduced into the rolling process, with a consequent unfavourable effect on rolling behaviour in the finishing step and on the attainable tolerances of the final rolling thickness.
It is an object of the invention so to improve a coil box furnace of the kind specified that the coil stored therein can be heated to rolling temperature as evenly as possible, so that the temperature-conditioned final thickness tolerances of the finished rolled strip can be minimised.
The invention relates to a coil box furnace having a heating system for repeating a coil to rolling temperature and a saddle for receiving the coil to be repeated.
The cost optimisation of the production of hot strip is increasingly forcing the use of peripheral systems to minimise rejects of material. These include more particularly systems by means of which a preliminary strip situated on the processing line can be so preserved if any fault occurs, that when the fault has been eliminated the said strip can be reintroduced into the processing line for the continuation of production.
A coil box situated at the inlet to a finishing step enables the preliminary strip to be buffered in time prior to introduction to the finishing step, the time being approximately ten minutes for soft steel qualities.
Such an arrangement of a coil box is known, for example, from DE-OS 2 256 030. However, stainless steels, which can be rolled only within a narrow temperature range, do not offer these reserves, so that if disturbances occur for several minutes such preliminary strips are deposited as coil, but have not hitherto been successfully reintroduced into the rolling line.
It is know from EP 0 734 793 A1 to provide coil boxes upstream and downstream of a reversing stand. It is also known from that citation to provide a furnace in which the strip is repeated after passing through the reversing stand. The provision of a repeating furnace at the coil box enables the aforementioned problems to be obviated, since the coil box preliminary strips occurring are heated to rolling temperature and reintegrated into the rolling process.
One prior art coil box furnace takes the form of a chamber furnace having a fixed and a moveable casing part. The moveable casing part has an eletromechanical drive and can be moved on wheels over rails. The furnace is heated via meandering heating conductors, which are installed at the four side walls of the furnace and combined into individual control groups. The receiving saddle for the coil, which has the shape of a segment of a circle and has no extra heating, stands on a base plate of refractory concrete and a frame of creep resistant steel (cf. Fig. 1).
However, with this prior art coil box furnace considerable periodic changes in temperature were discovered in the preliminary strip reintroduced into the rolling process, with a consequent unfavourable effect on rolling behaviour in the finishing step and on the attainable tolerances of the final rolling thickness.
It is an object of the invention so to improve a coil box furnace of the kind specified that the coil stored therein can be heated to rolling temperature as evenly as possible, so that the temperature-conditioned final thickness tolerances of the finished rolled strip can be minimised.
To solve this problem, according to the invention the saddle has at least two bearing surfaces tangentially bearing the coil at its external periphery, the saddle being preferably constructed trapezoidal.
The solution of the problem according to the invention is based on the realisation that the periodic changes in temperature in the preliminary strip removed from the prior art box furnace are due to the receiving saddle of the furnace, which has the shape of a segment of a circle, since said saddle withdraws thermal energy from the applied strip by radial heat conduction over a relatively large range, and this leads to the aforementioned periodic changes in temperature.
In contrast, in the coil box furnace according to the invention the bearing zone of the receiving saddle is substantially smaller, thus appreciably reducing the heat loss, and thereby correspondingly improving the rolling behaviour in the finishing step and the thickness tolerances of the finished rolled strip.
In one advantageous embodiment of the construction according to the invention the bearing surfaces are formed by a plurality of raised portions spaced out in the direction of coil width. This feature further reduces the actual zone of contact between the saddle and the coil. Preferably in that case the saddle can consist of interfitted stainless steel slabs having projecting raised portions. To stabilise the receiving saddle according to the invention, in contrast with the aforementioned saddle having the shape of a segment of a circle, no refractory material is required.
The solution of the problem according to the invention is based on the realisation that the periodic changes in temperature in the preliminary strip removed from the prior art box furnace are due to the receiving saddle of the furnace, which has the shape of a segment of a circle, since said saddle withdraws thermal energy from the applied strip by radial heat conduction over a relatively large range, and this leads to the aforementioned periodic changes in temperature.
In contrast, in the coil box furnace according to the invention the bearing zone of the receiving saddle is substantially smaller, thus appreciably reducing the heat loss, and thereby correspondingly improving the rolling behaviour in the finishing step and the thickness tolerances of the finished rolled strip.
In one advantageous embodiment of the construction according to the invention the bearing surfaces are formed by a plurality of raised portions spaced out in the direction of coil width. This feature further reduces the actual zone of contact between the saddle and the coil. Preferably in that case the saddle can consist of interfitted stainless steel slabs having projecting raised portions. To stabilise the receiving saddle according to the invention, in contrast with the aforementioned saddle having the shape of a segment of a circle, no refractory material is required.
Also advantageously according to another feature of the construction according to the invention, the receiving saddle also has a heating device alongside the walls of the coil box furnace. Preferably an inductive saddle heating system can be used.
Another advantageous feature of the coil box furnace according to the invention is that it also has a device for rotating or rocking the coil. This feature also contributes towards an evening-out of the temperature profile of the preliminary strip reintroduced into the finishing step.
In view of different coil diameters and/or coil widths, also advantageously the spacing of the bearing surfaces can be adjusted in relation to coil diameter and/or coil width.
According to another advantageous feature of the invention the spacing of the bearing surfaces can be formed by disc rollers having circular discs spaced out along the roller longitudinal axes. For rotating or rocking the coil, at least one of the disc rollers can be coupled to a rotary drive.
The invention will now be explained in greater detail with reference to the diagrammatic drawings, which illustrate a number of embodiments and which show:
Fig. 1 a sectional side elevation of a coil box furnace with a coil borne in a conventional receiving saddle, Fig. 2 a front elevation of a receiving saddle according to the invention with preliminary strip coils of different diameter and width indicated in chain dot lines, Fig. 3 a side elevation of the receiving saddle shown in Fig. 2, Fig. 4 a plan view of the receiving saddle shown in Fig. 2, Fig. 5 a front elevation of a second embodiment of a receiving saddle according to the invention, and Fig. 6 a plan view of the receiving saddle shown in Fig. 5.
As shown in Fig. l, a coil box furnace is a chamber furnace having a fixed casing part 1 and a casing part 2 moveable on rails. The furnace has a heating system (not shown) for repeating a preliminary strip coil 3 to rolling temperature. A receiving saddle 4 in the shape of a segment of a circle receives the coil.
In contrast, the coil box furnace according to the invention has a receiving saddle as shown diagrammatically by way of example in Figs. 2 to 4. As can be seen, the receiving saddle 4' comprises a base plate 5 with two spaced-out supports 6, 7 to each of which a bearing 8, 9 is attached. The bearings 8, 9 form two bearing surfaces 10, 11 tangentially bearing the preliminary strip coil 3 at its external periphery. The bearing surfaces 10, 11 consist of interfitted stainless steel slabs having a plurality of raised portions 12 spaced out in the direction of coil width. Each of the raised portions 12, which are formed by grooves 13 extending parallel with the peripheral direction of the coil 3, has substantially flat bearing surfaces.
Alternatively, the raised portions can also be constructed convex.
As shown by chain dot lines in Figs. 2 and 3, the preliminary strip coil 3, 3' to be received by the saddle 4' can have different diameters and also different widths. The spacing of the zones of contact between the coil 3 and the bearing surfaces 10, 11 also increases with increasing diameter of the preliminary strip coil 3.
To completely prevent heat loss via the receiving saddle 4', the saddle 4' can also have a heating system (not shown). This system can preferably consist of an inductive saddle heating system.
Fig. 5 shows diagrammatically a second embodiment of a receiving saddle for a coil box furnace according to the invention. In contrast with the embodiment illustrated in Figs. 2 to 4, in this embodiment the bearing surfaces of the saddle 4 " are formed by rotatable disc rollers 14 having circular discs 15 spaced out along the roller longitudinal axes. The disc rollers 14 are mounted in supporting blocks 16, 17, which rotatably bear the pivots 18/shafts 19 of the disc rollers in the gaps between the spaced-out circular discs 15 and are formed with recesses in the zone of the circular discs 15.
To obtain an optimum bearing of the particular coil 3 in dependence on coil diameter, the spacing of the bearing surfaces - i.e., the distance A of the roller longitudinal axes can be adjusted. One of the disc rollers 14 is also provided with a rotary drive which has a transmission 20 and an electric motor 21 and by means of which the supported coil 3 can be rotated during heating in the coil box furnace to even out the temperature profile. The rotation can be performed exclusively in one direction or else also alternately in both directions of rotation, so that in practice the coil 3 performs a rocking movement.
Another advantageous feature of the coil box furnace according to the invention is that it also has a device for rotating or rocking the coil. This feature also contributes towards an evening-out of the temperature profile of the preliminary strip reintroduced into the finishing step.
In view of different coil diameters and/or coil widths, also advantageously the spacing of the bearing surfaces can be adjusted in relation to coil diameter and/or coil width.
According to another advantageous feature of the invention the spacing of the bearing surfaces can be formed by disc rollers having circular discs spaced out along the roller longitudinal axes. For rotating or rocking the coil, at least one of the disc rollers can be coupled to a rotary drive.
The invention will now be explained in greater detail with reference to the diagrammatic drawings, which illustrate a number of embodiments and which show:
Fig. 1 a sectional side elevation of a coil box furnace with a coil borne in a conventional receiving saddle, Fig. 2 a front elevation of a receiving saddle according to the invention with preliminary strip coils of different diameter and width indicated in chain dot lines, Fig. 3 a side elevation of the receiving saddle shown in Fig. 2, Fig. 4 a plan view of the receiving saddle shown in Fig. 2, Fig. 5 a front elevation of a second embodiment of a receiving saddle according to the invention, and Fig. 6 a plan view of the receiving saddle shown in Fig. 5.
As shown in Fig. l, a coil box furnace is a chamber furnace having a fixed casing part 1 and a casing part 2 moveable on rails. The furnace has a heating system (not shown) for repeating a preliminary strip coil 3 to rolling temperature. A receiving saddle 4 in the shape of a segment of a circle receives the coil.
In contrast, the coil box furnace according to the invention has a receiving saddle as shown diagrammatically by way of example in Figs. 2 to 4. As can be seen, the receiving saddle 4' comprises a base plate 5 with two spaced-out supports 6, 7 to each of which a bearing 8, 9 is attached. The bearings 8, 9 form two bearing surfaces 10, 11 tangentially bearing the preliminary strip coil 3 at its external periphery. The bearing surfaces 10, 11 consist of interfitted stainless steel slabs having a plurality of raised portions 12 spaced out in the direction of coil width. Each of the raised portions 12, which are formed by grooves 13 extending parallel with the peripheral direction of the coil 3, has substantially flat bearing surfaces.
Alternatively, the raised portions can also be constructed convex.
As shown by chain dot lines in Figs. 2 and 3, the preliminary strip coil 3, 3' to be received by the saddle 4' can have different diameters and also different widths. The spacing of the zones of contact between the coil 3 and the bearing surfaces 10, 11 also increases with increasing diameter of the preliminary strip coil 3.
To completely prevent heat loss via the receiving saddle 4', the saddle 4' can also have a heating system (not shown). This system can preferably consist of an inductive saddle heating system.
Fig. 5 shows diagrammatically a second embodiment of a receiving saddle for a coil box furnace according to the invention. In contrast with the embodiment illustrated in Figs. 2 to 4, in this embodiment the bearing surfaces of the saddle 4 " are formed by rotatable disc rollers 14 having circular discs 15 spaced out along the roller longitudinal axes. The disc rollers 14 are mounted in supporting blocks 16, 17, which rotatably bear the pivots 18/shafts 19 of the disc rollers in the gaps between the spaced-out circular discs 15 and are formed with recesses in the zone of the circular discs 15.
To obtain an optimum bearing of the particular coil 3 in dependence on coil diameter, the spacing of the bearing surfaces - i.e., the distance A of the roller longitudinal axes can be adjusted. One of the disc rollers 14 is also provided with a rotary drive which has a transmission 20 and an electric motor 21 and by means of which the supported coil 3 can be rotated during heating in the coil box furnace to even out the temperature profile. The rotation can be performed exclusively in one direction or else also alternately in both directions of rotation, so that in practice the coil 3 performs a rocking movement.
Claims (9)
1. A coil box furnace having a heating device for reheating a coil (3) to rolling temperature and a saddle (4', 4'') receiving the coil to be reheated, the saddle (4', 4'') having at least two bearing surfaces (10, 11) tangentially bearing the coil (3, 3') at its external periphery, characterised in that the saddle (4', 4'') is built up from interfitted slabs.
2. A coil box furnace according to claim 1, characterised in that the saddle (4', 4'') is constructed trapezoidal.
3. A coil box furnace according to claims 1 or 2, characterised in that the bearing surfaces (10, 11) are formed by a plurality of raised portions spaced out in the direction of coil width.
4. A coil box furnace according to one of the preceding claims, characterised in that the slabs are made from stainless steel.
5. A coil box furnace according to one of the preceding claims, characterised in that the saddle (4', 4'') is also provided with a heating system.
6. A coil box furnace according to one of the preceding claims, characterised in that the furnace also has a device (14 to 21) for rotating or rocking the coil (3).
7. A coil box furnace according to one of the preceding claims, characterised in that the spacing of the bearing surfaces (10, 11) can be adjusted in relation to coil diameter and/or coil width.
8. A coil box furnace according to one of the preceding claims, characterised in that the bearing surfaces (10, 11) are formed by disc rollers (14) having circular discs (15) spaced out along the roller longitudinal axes.
9. A coil box furnace according to claim 8, characterised in that for the rotation or rocking of the coil (3) at least one of the disc rollers (14) can be driven by a rotary drive(20, 21).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19750998.3 | 1997-11-18 | ||
| DE19750998A DE19750998C1 (en) | 1997-11-18 | 1997-11-18 | Coil box furnace |
| PCT/EP1998/007298 WO1999025883A1 (en) | 1997-11-18 | 1998-11-14 | Coil box oven |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2310411A1 true CA2310411A1 (en) | 1999-05-27 |
Family
ID=7849040
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002310411A Abandoned CA2310411A1 (en) | 1997-11-18 | 1998-11-14 | Coil box oven |
Country Status (10)
| Country | Link |
|---|---|
| EP (1) | EP1032716B1 (en) |
| JP (1) | JP2001523762A (en) |
| AR (1) | AR014024A1 (en) |
| AT (1) | ATE223508T1 (en) |
| AU (1) | AU734790B2 (en) |
| CA (1) | CA2310411A1 (en) |
| DE (2) | DE19750998C1 (en) |
| TW (1) | TW490491B (en) |
| WO (1) | WO1999025883A1 (en) |
| ZA (1) | ZA9810397B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101263853B1 (en) | 2011-07-18 | 2013-05-13 | 주식회사 포스코 | Specimen automatic charging apparatus for pass aging heat treatment and the method of specimen temperature homonization for using that |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE609979C (en) * | 1929-08-11 | 1935-02-27 | Heimsoth & Vollmer G M B H | Device for heating heavy work pieces |
| GB1373375A (en) * | 1971-11-15 | 1974-11-13 | Canada Steel Co | Method for rolling hot metal workpieces |
| 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 |
| GB2167170B (en) * | 1984-11-21 | 1988-05-18 | Salem Furnace | Heat treatment of coils of metal |
| US5383651A (en) * | 1994-02-07 | 1995-01-24 | Pyrotek, Inc. | Aluminum coil annealing tray support pad |
| DE4434370C2 (en) * | 1994-09-15 | 1998-05-28 | Mannesmann Ag | Furnace plant as a buffer behind a thin slab caster |
| DE19512953A1 (en) * | 1995-03-28 | 1996-10-02 | Mannesmann Ag | Method and device for producing hot-rolled steel strip |
-
1997
- 1997-11-18 DE DE19750998A patent/DE19750998C1/en not_active Expired - Fee Related
-
1998
- 1998-11-06 AR ARP980105634A patent/AR014024A1/en unknown
- 1998-11-13 ZA ZA9810397A patent/ZA9810397B/en unknown
- 1998-11-14 JP JP2000521245A patent/JP2001523762A/en active Pending
- 1998-11-14 AT AT98955579T patent/ATE223508T1/en not_active IP Right Cessation
- 1998-11-14 WO PCT/EP1998/007298 patent/WO1999025883A1/en active IP Right Grant
- 1998-11-14 AU AU12352/99A patent/AU734790B2/en not_active Ceased
- 1998-11-14 EP EP98955579A patent/EP1032716B1/en not_active Expired - Lifetime
- 1998-11-14 DE DE59805451T patent/DE59805451D1/en not_active Expired - Fee Related
- 1998-11-14 CA CA002310411A patent/CA2310411A1/en not_active Abandoned
- 1998-12-02 TW TW087119007A patent/TW490491B/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| JP2001523762A (en) | 2001-11-27 |
| DE59805451D1 (en) | 2002-10-10 |
| EP1032716B1 (en) | 2002-09-04 |
| ZA9810397B (en) | 1999-05-13 |
| WO1999025883A1 (en) | 1999-05-27 |
| ATE223508T1 (en) | 2002-09-15 |
| AU1235299A (en) | 1999-06-07 |
| EP1032716A1 (en) | 2000-09-06 |
| AU734790B2 (en) | 2001-06-21 |
| AR014024A1 (en) | 2001-01-31 |
| TW490491B (en) | 2002-06-11 |
| DE19750998C1 (en) | 1999-08-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |