Furnace for heating metal strips, and device and method for producing metal strips by continuous casting and rolling

Abstract

A furnace for heating metal strips, and to a device and a method for producing metal strips by continuous casting and rolling. The device includes a casting machine, a furnace through which a metal strip can be transported in a conveying direction, a first external cutting apparatus and a second external cutting apparatus, the first external cutting apparatus being upstream of the furnace and the second external cutting apparatus being downstream of the furnace, in the conveying direction of the metal strip, and at least one rolling mill. A first internal cutting apparatus and a second internal cutting apparatus are provided inside the furnace. A segment of the metal strip between said internal cutting apparatuses can be separated by actuating the latter.

Claims

1. A furnace for heating metal strips, comprising: a housing, wherein a metal strip is transported through the housing in a conveying direction, a first internal cutting apparatus and a second internal cutting apparatus are provided inside the housing, the second internal cutting apparatus is arranged at a distance to the first internal cutting apparatus and arranged downstream from the first internal cutting apparatus in the conveying direction of the metal strip, said internal cutting apparatuses are actuated simultaneously such as to separate a segment of the metal strip located between the internal cutting apparatuses inside the furnace, the housing has a discharge section with an opening designed in a lateral area of the housing or in a top cover of the housing, such that the separated segment of the metal strip is discharged via the opening out of the furnace in a discharging direction, which extends orthogonally to the conveying direction, the internal cutting apparatuses are angled relative to one another with respect to the discharging direction such that a simultaneous first cut generated by the first internal cutting apparatus that defines a first end of the separated segment and a simultaneous second cut generated by the second internal cutting apparatus that defines a second end of separated segment respectively confine an angle between 5-15 in relation to the discharging direction in which the separated segment of the metal strip is discharged out of the furnace, and such that the angle of the cut generated with the first internal cutting apparatus is inclined against the conveying direction of the metal strip and the angle of the cut generated with the second internal cutting apparatus is inclined in the conveying direction of the metal strip.

2. The furnace according to claim 1, wherein a heat-insulating hood is provided adjacent to the opening.

3. The furnace according to claim 1, wherein a discharge device is provided in the area of the opening of the housing, by means of which discharge device the separated segment of the metal strip is discharged out of the housing of the furnace.

4. The furnace according to claim 3, wherein the discharge device comprises rollers arranged in the housing of the furnace, said rollers being able to be raised relative to an adjacent roller table to discharge the separated segment of the metal strip from the housing.

5. The furnace according to claim 3, wherein the discharge device has a support arm and a sliding device, by means of which the separated segment of the metal strip is discharged from the housing of the furnace, wherein the sliding device is designed between the two internal cutting apparatuses and is configured to move in the discharging direction.

6. The furnace according to claim 1, wherein at least the first internal cutting apparatus or at least the second internal cutting apparatus is designed in the form of a torch.

7. The furnace according to claim 1, wherein at least the first internal cutting apparatus or at least the second internal cutting apparatus is designed in the form of a laser cutting device.

8. The furnace according to claim 1, wherein at least the first internal cutting apparatus or at least the second internal cutting apparatus is designed in the form of a mechanical cutting apparatus.

9. The furnace according to claim 1, wherein the furnace is designed as a roller hearth furnace.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Further advantages and aspects of the present invention can be found in the following exemplary embodiments, which are described in detail using schematically simplified drawings.

(2) The drawings show:

(3) FIG. 1 A schematic side view of a device according to the invention in the form of a casting-rolling plant.

(4) FIG. 2 A top view of the device of FIG. 1.

(5) FIG. 3 A visualization of cuts, which are generated for a metal strip with the device of FIG. 1 in its furnace.

(6) FIG. 4 A schematic top view of a device according to another embodiment,

(7) FIG. 5 Schematic side views of a device according to the invention, with various sequences of the steps 1-6.

DETAILED DESCRIPTION

(8) In the following, preferred embodiments of an inventive device 1 for producing metal strips by continuous casting and rolling, an associated furnace 10 and a corresponding method are explained in detail in reference to FIGS. 1-5. Identical characteristics in the respective drawings are marked with identical reference numbers. It must be pointed out here that this drawing shows a simplification and in particular has not been prepared to scale.

(9) The inventive furnace 10 serves to heat metal strips and comprises a housing 11, wherein a metal strip 12 can be transported through the housing 11 in a conveying direction FR. A first internal cutting apparatus 14 and a second internal cutting apparatus 16 are provided inside the housing 11. Herein, the second internal cutting apparatus 16 is arranged at a distance to the first internal cutting apparatus 14 and arranged downstream from the first internal cutting apparatus 14 in a conveying direction FR of the metal strip 12.

(10) The furnace 10 is shown schematically in a side view in FIG. 1, as a part of the inventive device 1 or a corresponding casting-rolling plant. The reference marker FR symbolizes the conveying direction, along which a metal strip 12 can be transported or conveyed through the housing 11 of the furnace 10 (in the drawing, from the left side to the right side).

(11) The two internal cutting apparatuses 14 and 16 of the furnace 10 can be designed such that they can be actuated simultaneously, thereby separating a segment 18 of the metal strip 12 located between the internal cutting apparatuses 14 and 16 inside the furnace 10. Alternatively, these two internal cutting apparatuses 14 and 16 can also be actuated consecutively, which then also results in the separating of a segment of the metal strip 12 located between the internal cutting apparatuses. The top view of the furnace 10 or of the device 1 according to FIG. 2 shows such a separated element 18 of the metal strip 12 as it is unloaded laterally from the furnace 10. For this purpose, the housing 11 of the furnace 10 has a discharge section 17, preferably in a lateral area S of the housing 11. Herein, an opening 20 (indicated symbolically in FIG. 2 with a dashed line) is provided, from which a separated segment 18 of the metal strip 12 can be unloaded from the furnace 10.

(12) The internal cutting apparatuses 14 and 16 are designed such that the cuts T.sub.1 and T.sub.2 generated by the same in the metal strip 12 respectively extend at an angle and respectively confine an angle between 3-30, preferably between 5-15, in relation to the discharge direction AR (cf. FIG. 2) in which a separated segment 18 of the metal strip 12 can be discharged from the discharge section 17 of the furnace 10. This relationship is clarified again in the representation in FIG. 3. The angle W.sub.1 of the cut T.sub.1 generated in the metal strip 12 with the first internal cutting apparatus 14 is inclined against the conveying direction FR of the metal strip 12. As a complement, the angle W.sub.2 of the cut T.sub.2 generated with the second internal cutting apparatus 16 is inclined in the direction of the conveying direction FR of the metal strip 12. This way, the cuts T.sub.1 and T.sub.2 and their angle to each other result in an open wedge in the direction of the discharge direction AR, thus facilitating the discharging of a segment 18 of the metal strip 12, which has been separated between the internal cutting apparatuses 14 and 16, from the furnace 10, because this separated segment 18 will not get jammed or caught.

(13) FIG. 4 again shows a top view of the furnace 10. In this view, it is apparent that a heat-insulating hood 22 is provided adjacent to the opening 20, which is designed in the lateral area S of the housing 11 of the furnace 10. This hood 22 also can be split at an angle in the discharge section 17, such that the sealing effect of this hood 22 can be implemented more easily, for example, by use of overlapping edges.

(14) A discharge device 24 (FIG. 1) for the furnace 10 is provided in the area of the opening 20 of the housing 11, wherein said discharge device 24 makes it possible to discharge a separated segment 18 of the metal strip 12 out of the furnace 10. The discharge device 24 has rollers 26, which are arranged inside the housing 11 of the furnace 10, said rollers 26 being able to be raised relative to an adjacent roller table 28 to discharge a separated segment 18 of the metal strip 12 out of the housing 11 of the furnace 10. Additionally, the discharge device 24 can also comprise a support arm 30 (cf. FIG. 2), by means of which a separated segment 18 of the metal strip 12 can be received outside of the furnace 10. Furthermore, the discharge device 24 can also comprise a sliding device 32, which is symbolically shown as T in FIG. 2, both in an idle position (solid line) and in an operational position (dashed line), when it has pushed or discharged a separated segment 18 of the metal strip 12 from the housing 11 of the furnace 10.

(15) The internal cutting apparatuses 14 and 16 of the furnace 10 preferably are designed as torches and will be referred to as torches in the following, wherein this reference term does not constitute a limitation.

(16) The representation according to FIGS. 1, 2 and 4 clarifies the involvement of the inventive furnace 10 for a device 1 in the form of a casting-rolling plant. The device 1 comprises a casting machine 2, a first external cutting apparatus 3 and a second external cutting apparatus 4, wherein the furnace 10 is arranged between these external cutting apparatuses 3 and 4, and rolling mills 5 and 6, which also can be arranged on both sides of the furnace 10.

(17) The top view according to FIGS. 2 and 4 clarifies that the device 1 furthermore has a unloading roller table 7 (indicated symbolically by double-dashed lines), by means of which a separated segment 18 of the metal strip 12 can be discharged or conveyed out of the furnace 10. As shown in FIG. 4, a crushing apparatus, for example in the form of a scrap shear, can be provided adjacent to the unloading roller table 7, by means of which crushing apparatus a segment 18 of the metal strip 12, which has been unloaded from the furnace 10, can be crushed or cut apart.

(18) A fault monitoring system 8 (cf. FIG. 1) with a processing computer P is provided for the device 1, wherein the torches 14 and 16 of the furnace 10, and preferably also the first external cutting apparatus 3 and the second external cutting apparatus 4, are able to send and receive signals to/from the processing computer P (symbolized by dotted lines in FIG. 1). If a fault occurs during the continuous casting and rolling with the device 1, the torches 14 and 16 can be automatically actuated by the processing computer P of the fault monitoring system 8, in order to separate a segment 18 of the metal strip 12 inside the housing 11 of the furnace 10. In this context, it also is possible to automatically actuate the external cutting apparatuses 3 and 4 and/or the discharge device 24 with the processing computer P to discharge a separated segment 18 out of the furnace 10 in the desired manner, specifically in the discharge section 17 via the opening 20 provided in said section.

(19) In FIG. 1, additional downstream apparatuses of the device 1 are symbolized with the reference number 9, wherein said apparatuses can be connected to the casting-rolling plant in the conveying direction FR of the metal strip 12.

(20) The operating principle of the present invention is explained in the following in reference to FIG. 5, in which six steps 1-6 are shown as an example, which can be executed with the device 1 if a malfunction occurs in the casting-rolling plant.

(21) In step 1 according to FIG. 5, the metal strip 12 is separated by means of the torches 14 and 16 inside the furnace 10, wherein subsequently the segment 18 of the metal strip 12 thus generated (referred to as piece A in FIG. 5) is conveyed laterally out of the discharge section 17 of the furnace 10. In this context, reference is made to the inclined cuts T.sub.1 and T.sub.2 generated by the torches 14 and 16, said cuts T.sub.1 and T.sub.2 having been explained previously in reference to FIG. 3. Thanks to these inclined cuts T.sub.1 and T.sub.2, it is possible to laterally discharge a separated segment 18 of the metal strip 12 (or piece A) without said segment getting jammed.

(22) In step 2 according to FIG. 5, the metal strip 12 is cut upstream of the furnace 10 by means of the first external cutting apparatus 3, wherein then the (still connected) pieces B, C and D of the metal strip 12 are transported along the conveying direction FR toward the discharge section 17. In step 3 according to FIG. 5, the piece B of the metal strip 12 is then cut or separated by means of the two torches 14 and 16 and is subsequently discharged laterally out of the discharge section 17. This also is repeated with the piece C of the metal strip 12. Should the material length be greater than that shown in FIG. 5, additional pieces C of the metal strip 12 are transported in the direction of the discharge section 17, following the same sequence as described previously, where they are cut or separated by the two torches 14 and 16 and subsequently discharged laterally out of the furnace 10.

(23) In step 4 according to FIG. 5, the remaining piece D of the metal strip 12 is transported toward the discharge section 17 and is subsequently discharged laterally out of the discharge section 17 in the manner described previously.

(24) In step 5 according to FIG. 5, the metal strip 12 is cut by means of the second external cutting apparatus 4, which is arranged downstream of the furnace 10 in the conveying direction FR of the metal strip 12. Subsequently, the piece E of the metal strip 12 thus separated is transported against the conveying direction FR into the discharge section 17 of the furnace 10 and is then conveyed laterally out of the furnace 10. Should the material length of the piece E be greater than that shown in FIG. 5, additional pieces E are transported into the discharge section 17analogous to step 3where they are cut or separated by the two torches 14 and 16 and subsequently discharged laterally out of the discharge section 17.

(25) In step 6 according to FIG. 5, the section of the device 1 between the external cutting apparatuses 3 and 4 is emptied, that is, cleared of the metal strip 12 without requiring transport apparatuses located before or after the material (that is, upstream or downstream of the furnace 10).

(26) The sequence of steps described above in reference to FIG. 5 also describes a method according to the present invention.

LIST OF REFERENCE NUMBERS

(27) 1 Device 2 Casting machine 3 First external cutting apparatus 4 Second external cutting apparatus 5 Rolling mill 6 Rolling mill 7 Unloading roller table 8 Fault monitoring system 9 Subsequent apparatuses (of the device 1) 10 Furnace 11 Housing 12 Metal strip 14 First internal cutting apparatus (or torch) 16 Second internal cutting apparatus (or torch) 17 Discharge section (of the furnace 10) 18 Segment of the metal strip (separated by the cutting apparatuses 14+16) 20 Opening (in the housing 12 of the furnace 10) 22 Heat-insulating hood 24 Discharge device 26 Rollers (inside the housing 12) 28 Roller table (adjacent to the rollers 24) 30 Support arm 32 Sliding device AR Discharging direction (for discharging a segment) FR Conveying direction P Processing computer (of the fault monitoring system) S Lateral section (of the housing 12) T.sub.1 Cut (generated by the first cutting apparatus 14) T.sub.2 Cut (generated by the second cutting apparatus 16) W.sub.1 Angle (between cut T.sub.1 and discharging direction A) W.sub.2 Angle (between cut T.sub.2 and discharging direction A) Z Crushing apparatus