CN111760912A - Hot-rolled strip steel endless rolling intermediate billet connecting method and system - Google Patents
Hot-rolled strip steel endless rolling intermediate billet connecting method and system Download PDFInfo
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- CN111760912A CN111760912A CN202010675468.6A CN202010675468A CN111760912A CN 111760912 A CN111760912 A CN 111760912A CN 202010675468 A CN202010675468 A CN 202010675468A CN 111760912 A CN111760912 A CN 111760912A
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- 238000005096 rolling process Methods 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 33
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 19
- 239000010959 steel Substances 0.000 title claims abstract description 19
- 230000007246 mechanism Effects 0.000 claims abstract description 40
- 238000010008 shearing Methods 0.000 claims abstract description 15
- 238000005507 spraying Methods 0.000 claims abstract description 13
- 238000007133 aluminothermic reaction Methods 0.000 claims abstract description 11
- 210000001503 joint Anatomy 0.000 claims abstract description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 27
- 238000001816 cooling Methods 0.000 claims description 21
- 239000000843 powder Substances 0.000 claims description 19
- 238000003466 welding Methods 0.000 claims description 19
- 239000010410 layer Substances 0.000 claims description 17
- 238000002347 injection Methods 0.000 claims description 15
- 239000007924 injection Substances 0.000 claims description 15
- 238000006243 chemical reaction Methods 0.000 claims description 13
- 229910052742 iron Inorganic materials 0.000 claims description 12
- 239000011229 interlayer Substances 0.000 claims description 11
- 239000003832 thermite Substances 0.000 claims description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 239000010949 copper Substances 0.000 claims description 6
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 3
- 229910000599 Cr alloy Inorganic materials 0.000 claims description 3
- 229910000990 Ni alloy Inorganic materials 0.000 claims description 3
- 229910001080 W alloy Inorganic materials 0.000 claims description 3
- 239000011651 chromium Substances 0.000 claims description 3
- 239000002826 coolant Substances 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 229910052681 coesite Inorganic materials 0.000 claims description 2
- 229910052906 cristobalite Inorganic materials 0.000 claims description 2
- 238000007747 plating Methods 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 claims description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 2
- 229910052682 stishovite Inorganic materials 0.000 claims description 2
- 229910052905 tridymite Inorganic materials 0.000 claims description 2
- 238000005304 joining Methods 0.000 claims 11
- 238000007789 sealing Methods 0.000 abstract description 10
- 238000004519 manufacturing process Methods 0.000 description 13
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 10
- 238000012423 maintenance Methods 0.000 description 5
- 239000007921 spray Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 230000006698 induction Effects 0.000 description 3
- 239000000376 reactant Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004093 laser heating Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0085—Joining ends of material to continuous strip, bar or sheet
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0007—Cutting or shearing the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B2015/0092—Welding in the rolling direction
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
The invention discloses a hot-rolled strip steel endless rolling intermediate billet connecting method and a system, belonging to the technical field of hot-rolled strip steel, wherein the connecting method comprises the following steps: the method comprises the following steps of continuously conveying a preceding intermediate billet after a rough rolling process and a subsequent intermediate billet conveyed next to the preceding intermediate billet to a finish rolling process, and butting the head end and the tail end of the preceding intermediate billet and the tail end of the subsequent intermediate billet, wherein: before butt joint, the ends of the two parts are respectively formed with straight end faces in the width direction, and then the straight end faces of the ends of the two parts are sequentially aligned, spaced, closed, subjected to aluminothermic reaction, fused and connected and cooled to realize connection. The connecting system comprises a roughing mill, a shearing machine, a connecting device and a finishing mill which are sequentially arranged along the rolling line direction, wherein the connecting device comprises a sealing mechanism and a spraying mechanism. The invention solves the problems of complex intermediate billet connecting equipment and poor reliability.
Description
Technical Field
The invention belongs to the technical field of hot-rolled strip steel, and particularly relates to a method and a system for connecting an intermediate blank of endless rolling of hot-rolled strip steel.
Background
The hot rolled strip endless rolling technology is one of the most advanced technologies in the world steel production at present, and can connect a plurality of rough rolled intermediate blanks, continuously enter a finishing mill group, be continuously and stably rolled by the finishing mill group, be stably cooled and subjected to phase change control by a laminar cooling line, and finally be sheared by flying shears and coiled into a plurality of hot rolled strip steel coils by a coiling machine. Compared with the conventional rolling, the endless rolling can obviously improve the production efficiency and the yield, improve the threading performance, reduce the roller consumption of the roller and realize the stable production of new products such as ultra-thin strips and the like.
The existing conventional hot continuous rolling production is changed into endless rolling production, and the most key technical problem is the connection problem of the intermediate blank after rough rolling. Because the endless rolling adopts a belt tension rolling mode, and the second flow of the intermediate billet and the second flow of the finish rolling mill are equal, the connection speed and the quality of the intermediate billet in a hot state influence whether the endless rolling can be realized: if the connection speed is too slow and the connection time is too long, the production efficiency is influenced, and obvious temperature drop is generated, so that the subsequent finish rolling is difficult to perform; if the connection strength is not high and the quality is not good, the strip breakage is easy to occur at the connection part, so that the continuous finish rolling can not be carried out; more importantly, as the conventional hot rolling endless rolling is mainly oriented to the reconstruction of the existing hot continuous rolling production line, and the production line space is fixed, the connecting equipment is not suitable to be large and complex, otherwise, the installation position of the equipment is limited, and the investment and production maintenance cost are increased.
At present, the endless rolling intermediate billet connection method realizes an induction heating connection method, a laser heating connection method and a shearing and pressing connection method which are industrially applied. The welding can be completed only by moving at least 20m by a huge induction heating mechanism of an induction heating connection method, and the existing hot continuous rolling production line has fixed space, needs to meet the walking space of 20m of connection equipment and is not easy to realize. The laser heat welding method also requires the connecting device to move during the connecting process, and thus there is a problem in that the moving space of the connecting device is limited. And the power required by the laser is very large, thus obviously increasing the equipment investment and the production cost. The shearing and crimping method adopts a specially designed shearing machine to shear the lapping area of the intermediate billet along the inclined plane, and applies pressure to the inclined plane while shearing so as to form physical combination along the shearing plane. Because the extremely large pressure required by physical connection needs to be met, the equipment is large in size, the length of the equipment is about 17m, the occupied space is large, and the equipment investment and maintenance cost is high.
Summarizing the existing intermediate billet connection mode, the main problems are that the equipment investment is large, the maintenance cost is high, the occupied area of the equipment is large or the space for a connecting mechanism to walk is large, and the main problems are undoubtedly the biggest obstacles to the transformation of the existing production line with fixed space.
Disclosure of Invention
In view of the above, the present invention provides a method and a system for connecting an intermediate slab in endless rolling of hot rolled strip steel, which are used to solve the problems of complex intermediate slab connection equipment and poor reliability in the prior art.
The invention is realized by the following technical scheme:
the invention provides a method for connecting a hot-rolled strip steel endless rolling intermediate billet, which is characterized in that the head end and the tail end of a preceding intermediate billet after a rough rolling procedure and a subsequent intermediate billet conveyed next to the preceding intermediate billet are butted in the process of continuously conveying the two intermediate billets to the front of a finish rolling procedure, wherein the method comprises the following steps: before butt joint, the ends of the two parts are respectively formed with straight end faces in the width direction, and then the straight end faces of the ends of the two parts are sequentially aligned, spaced, closed, subjected to aluminothermic reaction, fused and connected and cooled to realize connection.
Preferably, the straight end face of the tail end of the preceding intermediate billet and the straight end face of the head end of the subsequent intermediate billet have straight faces which are parallel to each other and form a predetermined angle with respect to the width direction of the slab.
Preferably, the temperature of the plate blank before the thermite reaction is controlled to be 950-1050 ℃, and the temperature of the cooled plate blank is controlled to be 950-1100 ℃.
The invention also provides a hot-rolled strip steel endless rolling intermediate billet connecting system, which is used for realizing the connecting method and comprises a roughing mill, a shearing machine, a connecting device and a finishing mill which are sequentially arranged along the rolling line direction, wherein the connecting device comprises a sealing mechanism and an injection mechanism, the shearing machine is used for cutting the tail end of a first intermediate billet and the head end of a subsequent intermediate billet into flat end surfaces, the sealing mechanism is used for sealing the two flat end surfaces at a certain distance, a cooling loop is arranged in an interlayer of the sealing mechanism, the injection mechanism is used for injecting welding powder into the interval of the two closed flat end surfaces, the high temperature of a plate blank provides aluminothermic reaction conditions for the welding powder, so that the welding powder generates molten iron to fill the interval to form a joint part, and the cooling loop is used for rapidly cooling the joint part.
Further, a hot coil box is arranged between the roughing mill and the shearing machine.
Further, a deburring machine is arranged between the connecting device and the finishing mill.
Further, the spraying mechanism is provided with a plurality of nozzles with adjustable spraying speed, spraying angle and spraying amount, and the nozzles are arranged at intervals along the width direction of the plate blank.
Further, the welding powder is Al or Fe2O3And Fe3O4In which Fe is2O3And Fe3O4The volume ratio of the mixture is inversely proportional to the slab scale thickness.
Further, the welding powder contains Al generated by thermite reaction2O3The slag former separated from molten iron mainly comprises CaO and SiO2And B2O3。
Further, the interlayer of the sealing mechanism is arranged between the inner layer and the outer layer, the inner layer is made of a copper plate, the outer layer is made of a steel plate, the inner surface of the inner layer is coated with a plating layer added with nickel, chromium and tungsten alloy, the cooling loop of the interlayer is made of a copper pipe, and the cooling medium in the interlayer is water.
The invention has the advantages that:
1. the invention has simple connecting process equipment, is composed of a sealing mechanism with a cooling function and an injection mechanism capable of adjusting injection speed, injection angle and injection amount, and has small floor area and low maintenance cost.
2. The invention adopts a mature self-propagating high-temperature synthesis technology, can quickly and stably realize the connection between the intermediate billet with large section and special-shaped section and different steel grades, has reliable connection mode and greatly expands the product range.
3. The intermediate billet is in a high-temperature state before connection, so that necessary temperature conditions are provided for thermite reaction, and after molten iron generated after reaction is cooled, firm metallurgical connection is realized, and the connection strength is high.
4. Because the iron oxide scale on the surface of the intermediate billet can influence the solid-state connection effect, the descaling procedure is required to be carried out before the connection in the general intermediate billet connection mode, and the iron oxide is used as a reactant to participate in the aluminothermic reaction, so that the descaling procedure before the connection is reduced, and the use amount of the oxide in the welding powder is also saved.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings, in which:
FIG. 1 is a schematic view of a connection system of the present invention.
Fig. 2 is a schematic view of the closing mechanism and the spraying mechanism of the connecting device of the present invention.
FIG. 3 is a schematic view of a closing mechanism cooling joint of the connection device of the present invention.
Fig. 4 is a schematic view of a joint of an intermediate blank of the present invention.
Fig. 5 is a partial perspective view of the closure mechanism of the connection device of the present invention.
Element number description: the device comprises a subsequent intermediate billet 1, a preceding intermediate billet 2, a closing mechanism 3, a spraying mechanism 4, welding powder 5, a joint part 6, a roughing mill 7, a hot rolling box 8, a shearing machine 9, a finishing mill 10 and a deburring machine 11.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
Referring to fig. 1-5, the hot rolled strip endless rolling intermediate billet connection system provided in this embodiment is disposed between a roughing mill 7 and a finishing mill 10 on a hot continuous rolling production line, and the advancing intermediate billet passes through a shearing machine 9, a connection device, and a deburring machine 11 in sequence according to the advancing direction; the connecting device comprises a closing mechanism 3 and a spraying mechanism 4, wherein the shearing machine is used for cutting the tail end of a first intermediate billet 2 and the head end of a subsequent intermediate billet 1 into straight end faces, the closing mechanism 3 is used for closing the two straight end faces at a certain distance, a cooling loop is arranged in an interlayer in the closing mechanism, the spraying mechanism 4 is used for spraying welding powder 5 into the interval of the two closed straight end faces, aluminothermic reaction conditions are provided for the welding powder 5 by the high temperature of a plate blank, so that the welding powder 5 generates molten iron to fill the interval to form a joint part 6, and the cooling loop is used for rapidly cooling the joint part 6.
The connecting method of the hot-rolled strip steel endless rolling-based intermediate billet connecting system comprises the following steps: in the course of continuously conveying a preceding intermediate billet 2 after a rough rolling process and a subsequent intermediate billet 1 conveyed next to the preceding intermediate billet 2 to a finish rolling process, the head and tail ends of the two are butted, wherein: before butt joint, the ends of the two parts are respectively formed with straight end faces in the width direction, and then the straight end faces of the ends of the two parts are sequentially aligned, spaced, closed, subjected to aluminothermic reaction, fused and connected and cooled to realize connection. Specifically, the ends of the intermediate billets after the rough rolling mill 7 are cut and leveled by a shearing machine 9, so that the heads and the tails of two adjacent intermediate billets form straight end faces; aligning the head and tail end parts of the prior intermediate blank 2 and the subsequent intermediate blank 1, and keeping a certain distance between the straight end surfaces of the head and the tail ends; when the device travels to a connecting device, a sealing mechanism 3 clamps a first intermediate blank and a subsequent intermediate blank and forms a connecting cavity with the periphery closed, a spraying mechanism 4 is aligned with a gap between two straight end faces to spray welding powder 5, a high-temperature plate blank provides a thermal reaction temperature condition for reaction, the welding powder 5 and the head end part and the tail end part of the high-temperature plate blank are subjected to aluminothermic reaction, iron oxide skin on the surface of the plate blank can be used as a reactant to participate in the reaction, heat is released instantly, molten iron is generated to fill the connecting cavity, and a joint part 6 is formed; then, closing the connecting cavity cover plate, opening a circulating water system of a cooling loop in the closing mechanism, rapidly cooling the joint part in fusion connection through the cooling loop of the closing mechanism, cooling the molten iron to 950-1100 ℃ to realize firm metallurgical connection of the joint part 6 and meet the temperature condition of rolling in a finishing mill; finally, the closing mechanism 4 is automatically removed, the deburring machine 11 is used for removing redundant burrs of the joint part, the burrs are prevented from damaging the roller of the finishing mill after entering the finishing mill, and finally the burrs enter the finishing mill 10 for rolling; the closing mechanism 3 and the injection mechanism 4 return to the original positions to wait for the next work order.
In this embodiment, the temperature of the intermediate billet entering the connecting device is controlled to be 950 ℃ to 1050 ℃.
In this embodiment, the straight end surface of the tail end of the preceding intermediate billet and the straight end surface of the head end of the succeeding intermediate billet have straight surfaces which are parallel to each other and form a predetermined angle with respect to the slab width direction.
In this embodiment, a hot box 8 is provided between the roughing mill 7 and the shear 9, which can make the temperature uniform and improve the surface quality and also play a process buffering role during the machining process, and at the same time, the hot box 8 can be used to store the intermediate billet so as to have enough time and space for the intermediate billet connection.
The spray mechanism 4 in the present embodiment is provided with a plurality of nozzles, each of which is adjustable in spray speed, spray angle, and spray amount, and is arranged at intervals in the slab width direction.
The welding powder in this example is Al, Fe2O3And Fe3O4In which Fe is2O3And Fe3O4The volume ratio of the mixture is inversely proportional to the slab scale thickness.
The welding powder of the present example contains CaO and SiO as trace components2And B2O3Constituent slag former, Al produced by aluminothermic reaction2O3Separated from molten iron to prevent Al from being generated by reaction2O3Remain in the molten iron, and reduce the connection strength of the joint.
The interlayer of the closing mechanism in the embodiment is arranged between an inner layer and an outer layer, the inner layer is made of a copper plate, the outer layer is made of a steel plate, and the inner surface of the inner layer is coated with a coating layer added with nickel, chromium and tungsten alloy, so that the friction resistance between molten steel and the inner wall of the groove is reduced, and the adhesion is prevented. The cooling loop of the interlayer is made of a copper pipe, and the cooling medium in the cooling loop is water.
For an intermediate billet with the thickness of 25 mm-30 mm, the temperature of molten iron generated after thermite reaction is about 1500 ℃, and the sealing mechanism can reduce the temperature of a joint part to 980-1050 ℃ within 10s, so that the joint part can realize firm metallurgical connection and simultaneously meet the temperature condition of rolling in a finishing mill.
By adopting the scheme, the connecting system is simple, the connecting system is composed of the sealing mechanism with the cooling function and the injection mechanism capable of adjusting the injection speed, the injection angle and the injection amount, the floor area is small, and the maintenance cost is low. And a mature self-propagating high-temperature synthesis technology is adopted, so that the connection between the large-section and special-shaped-section intermediate billets and different steel grades can be quickly and stably realized, the connection mode is reliable, and the product range is greatly expanded. Meanwhile, the intermediate billet is in a high-temperature state before connection, so that a necessary temperature condition is provided for thermite reaction, and after molten iron generated after reaction is cooled, firm metallurgical connection is realized, and the connection strength is high. And because the iron oxide scale on the surface of the intermediate billet can influence the solid-state connection effect, a descaling procedure is required before the connection in a general intermediate billet connection mode, and the iron oxide is used as a reactant to participate in thermite reaction, so that the descaling procedure before the connection is reduced, and the use amount of oxides in welding powder is also saved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and it is apparent that those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A method for connecting hot rolled strip endless rolled intermediate billets, wherein a leading intermediate billet (2) after a rough rolling process and a following intermediate billet (1) conveyed next to the leading intermediate billet are continuously conveyed to a process before a finish rolling process, and the leading and the trailing ends of the two are butted together, wherein the leading and the trailing ends of the two are respectively formed with straight end faces in the width direction before the butt joint, and the straight end faces of the leading and the trailing ends of the two are sequentially aligned, spaced, closed, subjected to aluminothermic reaction, fused and connected, and cooled during the butt joint to realize the connection.
2. The method of joining hot rolled strip endless rolled intermediate billets as claimed in claim 1, wherein the trailing straight end surface of the leading intermediate billet and the leading straight end surface of the following intermediate billet have straight surfaces which are parallel to each other and form a predetermined angle with respect to the width direction of the slab.
3. The hot-rolled strip endless rolling intermediate slab joining method as claimed in claim 1, wherein the slab temperature before the aluminothermic reaction is controlled to 950 to 1050 ℃, and the slab temperature after cooling is controlled to 950 to 1100 ℃.
4. A hot rolled strip endless rolling intermediate billet joining system for realizing the joining method according to any one of claims 1 to 3, comprising a roughing mill (7), a shearing machine (9), a joining device, and a finishing mill (10) arranged in this order in the rolling line direction, wherein the joining device comprises a closing mechanism (3) for cutting a flat end face from the tail end of a preceding intermediate billet and the head end of a subsequent intermediate billet, and a spraying mechanism (4) for spraying a welding powder (5) into the gap between the closed flat end faces, and a cooling circuit is provided in the interlayer for closing the two flat end faces at a predetermined distance from each other, and the high temperature of the slab provides an aluminothermic reaction condition for the welding powder to generate molten iron to fill the gap to form a joint (6), and the joint is rapidly cooled by the cooling circuit.
5. The hot rolled strip endless rolling intermediate slab joining system as claimed in claim 4, wherein a hot coil box (8) is further provided between said roughing mill and said shearing machine.
6. The hot rolled strip endless rolling intermediate slab joining system as claimed in claim 4, wherein a deburring machine (11) is further provided between the joining apparatus and the finishing mill.
7. The hot-rolled strip endless rolling intermediate slab connection system according to claim 4, wherein the injection mechanism is provided with a plurality of nozzles, each of which is adjustable in injection speed, injection angle and injection amount, and is arranged at intervals in the slab width direction.
8. The hot rolled strip endless rolling intermediate billet joining system as claimed in claim 4, wherein said weld powder is Al, Fe2O3And Fe3O4In which Fe is2O3And Fe3O4The volume ratio of the mixture is inversely proportional to the slab scale thickness.
9. The hot rolled strip endless rolling intermediate billet joining system as claimed in claim 8, wherein said weld powder contains Al produced by thermite reaction2O3The slag former separated from molten iron mainly comprises CaO and SiO2And B2O3。
10. The endless rolling intermediate billet connecting system for hot rolled strip steel according to claim 4, wherein the interlayer of the closing mechanism is disposed between an inner layer and an outer layer, the inner layer is made of a copper plate, the outer layer is made of a steel plate, the inner surface of the inner layer is coated with a plating layer added with nickel, chromium and tungsten alloy, the cooling loop of the interlayer is made of a copper pipe, and the cooling medium in the interlayer is water.
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| CN202010675468.6A CN111760912B (en) | 2020-07-14 | 2020-07-14 | Method and system for connecting endless rolling intermediate billets of hot rolled strip steel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113477710A (en) * | 2021-07-15 | 2021-10-08 | 中冶赛迪工程技术股份有限公司 | Connecting method and device for hot-rolled strip steel endless rolling intermediate billet |
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| CN113477710A (en) * | 2021-07-15 | 2021-10-08 | 中冶赛迪工程技术股份有限公司 | Connecting method and device for hot-rolled strip steel endless rolling intermediate billet |
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| CN111760912B (en) | 2024-06-04 |
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