CN112143877A - Hot-rolled high-strength steel full-continuous heat treatment production system and method - Google Patents
Hot-rolled high-strength steel full-continuous heat treatment production system and method Download PDFInfo
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- CN112143877A CN112143877A CN202010909183.4A CN202010909183A CN112143877A CN 112143877 A CN112143877 A CN 112143877A CN 202010909183 A CN202010909183 A CN 202010909183A CN 112143877 A CN112143877 A CN 112143877A
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- 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
- C21D9/0062—Heat-treating apparatus with a cooling or quenching zone
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
- C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
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- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/62—Quenching devices
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/62—Quenching devices
- C21D1/667—Quenching devices for spray quenching
-
- 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
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/573—Continuous furnaces for strip or wire with cooling
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- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
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- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Thermal Sciences (AREA)
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- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
The invention relates to a hot-rolled high-strength steel full-continuous heat treatment production system and a hot-rolled high-strength steel heat treatment method based on the same, wherein the production system comprises an uncoiler, a welding machine, a quenching device, a tempering device, a slitting shear and a product collecting unit which are sequentially connected and arranged along the running direction of a steel material, the quenching device comprises a quenching heating section and a quenching cooling section which are sequentially arranged along the running direction of the steel material, and the tempering device comprises a tempering heating section and a tempering cooling section which are sequentially arranged along the running direction of the steel material. The invention can realize the full-continuous heat treatment production of the hot-rolled high-strength steel, can obviously improve the heat treatment production efficiency of the hot-rolled high-strength steel, shortens the process flow, saves the investment and reduces the operation energy consumption.
Description
Technical Field
The invention belongs to the technical field of high-strength steel production, and relates to a hot-rolled high-strength steel full-continuous heat treatment production system and a hot-rolled high-strength steel heat treatment method based on the hot-rolled high-strength steel full-continuous heat treatment production system.
Background
With the development of the steel industry to the green and intelligent directions and the improvement of the modern industrial level, the industries of engineering machinery, commercial vehicles and the like have urgent needs on the aspects of light structure, upgrading and updating of products, improvement of product service life and the like of steel materials, and high-strength steel shows huge market space. For the engineering machinery industry, the strength grade of steel is improved, a large amount of energy cost can be saved, and meanwhile, the safety performance of the engineering machinery is also improved; for the commercial vehicle industry, the strength is improved, the light weight of the vehicle can be realized, the energy conservation and emission reduction are realized, and the service life is prolonged. In recent years, some heavy industry manufacturers have begun to use ultra-high strength structural steel of 960MPa or more to manufacture crane booms and pump truck distribution rods; part of dumper users intentionally adopt HB400-500 grade thin gauge wear plates to replace commonly used 345MPa grade products; there is a potential need in the truck industry to reduce the weight of the longerons using ultra-high strength steel. Therefore, the future steel market puts higher and higher requirements on the quality and the yield of the high-strength steel.
Early high-strength steel was developed by alloying, i.e. increasing the carbon content and alloy content in the steel, and increasing the strength of the steel by solid solution strengthening, precipitation strengthening and phase change strengthening, but this method has too high alloy cost and poor weldability and ductility of the steel. In recent years, the production of high-strength steel by TMCP technology becomes the mainstream, namely, the high-strength steel with good obdurability matching is obtained by combining online controlled rolling and controlled cooling; however, the TMCP technology has a long process flow, and the temperature uniformity of the steel plate is poor, so that the mechanical property fluctuation of the product is large. In addition, for hot rolled coils, the high-strength steel produced by online rapid cooling is limited by coiling, uncoiling and straightening capabilities, and the production difficulty is large. In contrast, the heat treatment production process of the hot rolled coil has significant advantages in producing high strength steel products with uniform properties.
At present, the mainstream high-strength steel heat treatment production process in China mainly comprises an off-line quenching and tempering (FQT) process and a direct quenching and off-line tempering (DQT) process. Patent CN101831530A discloses a heat treatment process for improving comprehensive mechanical properties of low-alloy high-strength steel, in the method, a martensite structure is refined through 3-6 times of circulating quenching and tempering processes, so that the strength of the steel is improved, but the method needs heating and cooling for many times, and is large in energy consumption and long in production period. Patent CN106148822A provides a method for producing a high-strength steel Q890 medium plate, and the method obtains a product with qualified performance by on-line quenching and off-line high-temperature tempering, and shortens the process flow, but the temperature uniformity in the hot rolling and quenching processes is difficult to control, so that the product performance of the final product has larger fluctuation.
Disclosure of Invention
The invention relates to a hot-rolled high-strength steel full-continuous heat treatment production system and a hot-rolled high-strength steel heat treatment method based on the hot-rolled high-strength steel full-continuous heat treatment production system, which can at least solve part of defects in the prior art.
The invention relates to a full-continuous heat treatment production system for hot-rolled high-strength steel, which comprises an uncoiler, a welding machine, a quenching device, a tempering device, a slitting shear and a product collecting unit which are sequentially connected and arranged along the running direction of steel materials, wherein the quenching device comprises a quenching heating section and a quenching cooling section which are sequentially arranged along the running direction of the steel materials, and the tempering device comprises a tempering heating section and a tempering cooling section which are sequentially arranged along the running direction of the steel materials.
As one embodiment, the quenching heating section comprises a first longitudinal magnetic induction heating furnace section, a transverse magnetic induction heating furnace section and a first soaking furnace section which are sequentially arranged along the running direction of the steel material.
As one embodiment, the quenching heating section further comprises a first edge heating furnace section, the first edge heating furnace section is arranged between the transverse magnetic induction heating furnace section and the first soaking furnace section, the first edge heating furnace section comprises two groups of first edge heating mechanisms for heating the edge of the strip steel, and the two groups of first edge heating mechanisms are respectively arranged on the transmission side and the operation side of the furnace body.
As one embodiment, the quenching cooling section comprises a plurality of cooling boxes which are sequentially arranged along the running direction of the strip steel, an intermediate tension roller is arranged between every two adjacent cooling boxes, and a cooling mechanism is arranged in each cooling box and comprises an aerosol cooling mechanism and/or a water spray cooling mechanism.
As one embodiment, the tempering heating section comprises a second longitudinal induction heating furnace section and a second soaking furnace section which are sequentially arranged along the running direction of the strip steel.
As one of the implementation modes, the tempering heating section further comprises a second edge heating furnace section, the second edge heating furnace section is arranged between the second longitudinal magnetic induction heating furnace section and the second soaking furnace section, the second edge heating furnace section comprises two groups of second edge heating mechanisms for heating the edges of the strip steel, and the two groups of second edge heating mechanisms are respectively arranged on the transmission side and the operation side of the furnace body.
In one embodiment, the tempering and cooling section comprises a tempering and cooling front section and a tempering and cooling rear section, wherein the tempering and cooling front section is provided with a circulating gas injection cooling mechanism, and the tempering and cooling rear section is provided with an air injection cooling mechanism and/or a water spray cooling mechanism.
As one embodiment, the product collecting unit comprises a strip steel coiling mechanism connected with the slitting shear, the strip steel coiling mechanism comprises a coiling machine, a steering pinch roll and a coil unloading car, the steering pinch roll is connected with the coiling machine through a strip penetrating guide plate, and a bending machine is arranged on the material supply side of the steering pinch roll.
As one embodiment, at least one auxiliary pressure roller is disposed around a winding drum of the winding machine, and an axial direction of the auxiliary pressure roller is parallel to an axial direction of the winding drum, and the auxiliary pressure roller is configured with an auxiliary pressure roller driving unit so as to have a working position in rolling contact with the steel coil and a standby position away from the steel coil.
The invention also relates to a hot-rolled high-strength steel heat treatment method, which adopts the hot-rolled high-strength steel full-continuous heat treatment production system to produce, wherein,
when the steel material is quenched, rapidly heating the steel material to 750-1200 ℃ at the speed of 15-30 ℃/s, and preserving heat for 2-8 minutes to obtain the austenite structure of the steel material in a target form; cooling the steel material after quenching heating to a target quenching final cooling temperature by adopting a multi-section quenching cooling mode to obtain a quenching state martensite structure in a target shape;
when the steel material is tempered, heating the steel material to 150-700 ℃, and preserving heat for 1-5 min; and cooling the steel material to room temperature by adopting a sectional cooling mode to obtain a tempered structure stable at room temperature.
The invention has at least the following beneficial effects: the production system provided by the invention can realize the full-continuous heat treatment production of the hot-rolled high-strength steel, can obviously improve the heat treatment production efficiency of the hot-rolled high-strength steel, shortens the process flow, saves the investment and reduces the operation energy consumption.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic composition diagram of a fully continuous heat treatment system for producing hot-rolled high-strength steel according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a strip steel conditioning system according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a quenching cooling apparatus provided in an embodiment of the invention;
FIG. 4 is a schematic view of the cooling mechanism according to the embodiment of the present invention;
FIG. 5 is a schematic view showing a state of a strip coiling system according to an embodiment of the present invention at an initial coiling stage;
FIG. 6 is a schematic view showing a state of a strip coiling system at the final coiling stage according to an embodiment of the present invention;
FIG. 7 is a schematic structural view of a take-up nip according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Referring to fig. 1, an embodiment of the present invention provides a fully continuous heat treatment production system for hot-rolled high-strength steel, including an uncoiler 1, a welder 2, a quenching device, a tempering device, a slitting shear 7 and a product collection unit, which are sequentially arranged in an abutting manner along a steel material running direction, wherein the quenching device includes a quenching heating section 51 and a quenching cooling section 52, which are sequentially arranged along the steel material running direction, and the tempering device includes a tempering heating section 53 and a tempering cooling section 54, which are sequentially arranged along the steel material running direction.
The production system can be suitable for the heat treatment production of high-strength strip steel, the uncoiler 1 is used for uncoiling a steel coil, the uncoiler 1 is conventional equipment in the field, and the specific structure is not described in detail here. In order to meet the requirement of uncoiling of high-strength steel, the uncoiler 1 can comprise a crease-resistant roller for preventing strip steel from wrinkling and a compression roller for preventing a steel coil from loosening; because the hot-rolled coil head plate has poor quality, a clamp type uncoiler is preferably adopted to improve the threading efficiency; and a double-channel uncoiling mode is further preferably adopted, so that the shutdown time for coil replacement at an inlet section is reduced, and the production efficiency is improved.
The production system can also be suitable for the heat treatment production of high-strength steel plates, and the uncoiler 1 can be idle and can send the steel plates to a downstream process through a conveying roller way; that is, the production system is preferably capable of satisfying heat treatment production of the high-strength steel strip and the high-strength steel plate at the same time.
Further preferably, the outlet side of the uncoiler 1 is provided with a pinch straightener for pinching a strip head and primarily straightening an incoming steel coil, the straightener can adopt a transmission-separated double-roll system and multiple-roll system for straightening, and different roll systems are adopted for different thickness strip steels, so that the straightening precision can be improved, the stress of the transmission rolls can be reduced, and roll breakage can be prevented. Optionally, the outlet side of the pinch straightener is provided with a slitting shear 7 and a scrap output device for cutting off scrap at the head of the steel coil. As is readily known, the above-mentioned clamp straightener, slitting shear 7 is arranged between the unwinder 1 and the welder 2.
The welding machine 2 is used for connecting the front and the rear ends of steel materials, and ensures that the machine set can realize full-continuous production. In consideration of high alloy content and poor toughness of the hot-rolled high-strength steel, the welding form of the welding machine 2 is preferably laser-arc hybrid welding, and the toughness of a welding seam can be improved through reasonable selection of welding wire materials. Optionally, the welder 2 is self-contained with a crescent shear, a centering device, a trimming device and a punching device. Further preferably, an induction heating device is disposed at an outlet side of the welding machine 2, and is used for performing online heat treatment on the weld joint, reducing the internal stress of the weld joint, and improving the structural uniformity of a heat affected zone, thereby improving the comprehensive mechanical properties of the weld joint.
Further preferably, as shown in fig. 1, a first loop 3 is arranged between the welding machine 2 and the quenching device, the first loop 3 can store strip steel to ensure that the process section can continuously run at a constant speed, and the loop can be in the form of a multi-layer horizontal loop, a vertical loop or a pit loop.
Further preferably, as shown in fig. 1, a steel material pretreatment unit 41 is disposed between the welding machine 2 and the quenching apparatus, and the steel material pretreatment unit 41 may adopt one or more of a shot blasting machine, a straightening machine, and a brush roller. The pretreatment equipment is preferably configured at the same time, wherein the shot blasting machine removes the iron scales on the surface of the strip steel by jetting cast steel shots to the surface of the strip steel at a high speed, so that the strip steel has good surface quality before entering a heating furnace; the brush roll is arranged at the outlet side of the shot blasting machine and is used for removing residual steel shots and iron scale floating ash on the surface of the strip steel; the straightening machine is arranged at the outlet side of the brush roll and used for straightening the strip steel, so that the strip steel is ensured to have a good plate shape before entering the quenching furnace, and considering that the hot-rolled high-strength steel and plastic property is poor, the straightening form of the straightening machine preferably adopts pulling straightening or tension roll straightening, the maximum elongation of the surface of the strip steel is reduced through the deviation of a neutral layer, and cracks are prevented from appearing on the surface of the strip steel in the straightening process. Furthermore, tension roller sets are arranged at the inlet and the outlet of the shot blasting machine and the inlet and the outlet of the straightening machine, and are used for providing tension required by the strip steel in the shot blasting and straightening processes and isolating the tension.
In one embodiment, as shown in fig. 1, a temperature straightening device is arranged between the quenching device and the tempering device, and is used for straightening the quenched and cooled steel material, and by adopting the temperature straightening mode, the deformation resistance of the high-strength steel in the straightening process can be reduced, the straightening difficulty is reduced, and meanwhile, the temperature rise amplitude of the subsequent tempering heating section 53 can also be reduced, and the energy consumption is reduced. Preferably, the straightening temperature of the temperature straightening device is controlled to be 100-300 ℃.
Further preferably, as shown in fig. 1, a steel material post-treatment unit 42 is arranged between the tempering device and the slitting shears 7, and the steel material pre-treatment unit 41 can adopt one or more of a shot blasting machine, a straightening machine and a brush roll. The pretreatment equipment is preferably configured at the same time, wherein the shot blasting machine removes the iron scales on the surface of the strip steel by jetting cast steel shots to the surface of the strip steel at a high speed, so that the strip steel has good surface quality before entering a heating furnace; the brush roll is arranged at the outlet side of the shot blasting machine and is used for removing residual steel shots and iron scale floating ash on the surface of the strip steel; the straightening machine is arranged at the outlet side of the brush roll and is used for straightening the strip steel, the shape and the surface quality of the strip steel are further improved, the straightening form of the straightening machine preferably adopts pulling straightening or tension roll straightening in consideration of poor hot-rolled high-strength steel-plastic property, the maximum elongation of the surface of the strip steel is reduced through the deviation of a neutral layer, and cracks are prevented from appearing on the surface of the strip steel in the straightening process. Furthermore, tension roller sets are arranged at the inlet and the outlet of the shot blasting machine and the inlet and the outlet of the straightening machine, and are used for providing tension required by the strip steel in the shot blasting and straightening processes and isolating the tension.
Further preferably, as shown in fig. 1, a second loop 6 is arranged between the tempering device and the slitting shears 7, the second loop 6 can store strip steel to ensure that the process section can continuously run at a constant speed, and the loop can be in the form of a multi-layer horizontal loop or a pit loop.
Further preferably, a fine straightening machine is arranged between the tempering device and the slitting shears 7 and is used for carrying out final straightening on finished steel materials, and the flatness of the surface of the strip steel is ensured to be less than 5I. The straightening form adopts one or more of withdrawal straightening, roll straightening or tension roll straightening. Optionally, a roller coater and a hot air dryer are arranged at the outlet of the fine straightening machine and used for performing surface pretreatment and rapid drying on the strip steel to prevent the strip steel from rusting or generating other surface defects in the storage and transportation process.
The slitting shear 7 is used for cutting finished steel materials to length, and meets the requirements of users on steel materials with different lengths. The slitting shear 7 can adopt a flying shear or a stopping shear mode, the flying shear or the stopping shear has the function of quickly changing the cutting edge, or a mode of changing one cutting edge for one use is adopted, and the downtime caused by changing the cutting edge at the outlet section can be effectively shortened.
Depending on the target product configuration, the product collection unit may be a coiler or a stacker 8, and preferably two channels are arranged on the outlet side of the slitting shear 7, one of the channels being adapted to guide the strip product to the coiler and the other channel being adapted to convey the steel sheets to the stacker 8. If the finished product is delivered in a plate state, the steel material is cut to length by a slitting shear 7, the qualified steel plate enters a stacker 8 for stacking, and the stack plate is transported to a packaging unit by a roller conveyor for offline packaging; if the finished product is delivered in a rolling state, the finished product of the strip steel is subjected to surface treatment and then directly enters a coiling machine for coiling. When the coil is supplied in a rolling state, the steel coil can be supplied after subsequent acid washing, galvanizing and finishing, and the enrichment of product types is facilitated.
The production system provided by the embodiment can realize the full-continuous heat treatment production of the hot-rolled high-strength steel, can obviously improve the heat treatment production efficiency of the hot-rolled high-strength steel, shortens the process flow, saves the investment and reduces the operation energy consumption.
Example two
The embodiment provides a strip steel quenching and tempering system, which can be used in the hot-rolled high-strength steel fully-continuous heat treatment production system provided by the first embodiment.
As shown in fig. 2, the strip steel quenching and tempering system comprises a strip steel quenching device and a strip steel tempering device, wherein the strip steel quenching device comprises a quenching heating section 51 and a quenching cooling section 52 which are sequentially arranged along the running direction of the strip steel, and the quenching heating section 51 comprises a first longitudinal magnetic induction heating furnace section 512, a transverse magnetic induction heating furnace section 513 and a first soaking furnace section 515 which are sequentially arranged along the running direction of the strip steel; the strip steel tempering device comprises a tempering heating section 53 and a tempering cooling section 54 which are sequentially arranged along the running direction of the strip steel, wherein the tempering heating section 53 comprises a second longitudinal magnetic induction heating furnace section 532 and a second soaking furnace section 534 which are sequentially arranged along the running direction of the strip steel.
In the above-described arrangement in which the temperature corrector 55 is disposed between the quenching apparatus and the tempering apparatus, accordingly, the temperature corrector 55 is disposed between the quenching cooling section 52 and the tempering heating section 53.
The first longitudinal magnetic induction heating furnace section 512 may adopt a longitudinal magnetic induction heating device conventional in the art, and the transverse magnetic induction heating furnace section 513 may adopt a transverse magnetic induction heating device conventional in the art, for example, a "transverse magnetic line induction heating device with a variable magnetic circuit width" disclosed in CN01117018.2, for example, a "wide-width induction heating device for uniformly heating strip steel" disclosed in CN201410011044.4, and specific structures thereof are not described herein again. In the embodiment, in the first longitudinal magnetic induction heating furnace section 512, a power supply system adopts a 10khz power frequency IGBT power supply technology, an inductor adopts a single-turn whole-plate induction coil technology, specifically, cavity sealing is realized through a muffle furnace structure in the inductor coil, and a cavity sealing device adopts a double-layer sealing sleeve structure technology; in the above-mentioned transverse magnetic induction heating furnace section 513, power supply system chooses for use 1khz power frequency IGBT power technology, and the inductor adopts multiturn induction coil technique, specifically realizes the cavity through the muffle furnace structure in the inductor coil and seals, and cavity sealing device adopts double-deck seal cover structure technique. Preferably, in the first longitudinal magnetic induction heating furnace section 512, the strip steel is rapidly heated to about 700 ℃ from the normal temperature, so that high comprehensive heat efficiency is ensured while rapid heating is realized; in the transverse magnetic induction heating furnace section 513, the strip steel is heated from 700 ℃ to a target quenching temperature (for example, about 950 ℃), and rapid and efficient heating after the Curie temperature point is realized.
The first soaking furnace section 515 can heat and equalize the temperature of the quenched and heated strip steel, so that the austenitization heat preservation of the strip steel is realized, the performance of the strip steel is effectively improved, and the consistency of the performance of the strip steel is promoted; preferably, an electric radiation heating pipe is arranged in the first soaking pit section 515, and a good soaking and heat preservation effect can be achieved by adopting an electric radiation pipe heating technology; the electromagnetic induction heating technology and the electric radiant tube heating technology are adopted to realize rapid quenching heating and heat preservation soaking, the length of a quenching heating furnace section can be greatly reduced, the length of the furnace section above 1/2 is saved, and intensive short-flow production is realized. Further preferably, a circulating fan for enhancing disturbance of furnace gas is further arranged in the first soaking furnace section 515, so that temperature uniformity in the furnace section can be improved, and operating energy consumption is reduced.
Similarly, the second longitudinal magnetic induction heating furnace section 532 may adopt a longitudinal magnetic induction heating device conventional in the art, and the detailed structure thereof is not described herein. In this embodiment, in above-mentioned second vertical magnetic induction heating furnace section 532, 10khz power frequency IGBT power technology is chooseed for use to electrical power generating system, and the inductor adopts single circle whole board induction coil technique, specifically realizes the cavity through the muffle furnace structure in the inductor coil and seals, and cavity sealing device adopts double-deck seal cover structure technique. The second longitudinal magnetic induction heating furnace section 532 can realize rapid tempering heating of the strip steel before 700 ℃, and particularly can realize low-temperature tempering (150-250 ℃), medium-temperature tempering (350-500 ℃) and high-temperature tempering (650-700 ℃) according to tempering process requirements.
The tempered and tempered strip steel can be heated and equalized by the second soaking furnace section 534, so that the uniformity of the width direction organization and carbide precipitation of the strip steel is improved, and the performance uniformity of strip steel products is improved. Preferably, an electric radiation heating pipe is arranged in the second soaking furnace section 534, and a good soaking and heat preservation effect can be achieved by adopting an electric radiation pipe heating technology; the electromagnetic induction heating technology and the electric radiant tube heating technology are adopted to realize rapid tempering heating and heat preservation soaking, the length of a tempering heating furnace section can be greatly reduced, the length of the furnace section above 1/2 is saved, and intensive short-flow production is realized. Further preferably, a circulating fan for enhancing disturbance of furnace gas is further arranged in the second soaking furnace section 534, so that temperature uniformity in the furnace section can be improved, and operating energy consumption is reduced.
Further optimize above-mentioned belted steel guenching unit, quenching heating section 51 still includes first edge heating furnace section 514, first edge heating furnace section 514 arrange in cross magnetic induction heating furnace section 513 with between the first soaking pit section 515, first edge heating furnace section 514 includes two sets of first edge heating mechanism that are used for carrying out the heating to belted steel limit portion, and two sets of first edge heating mechanism lists in furnace body transmission side and operation side separately. By arranging the first edge heating furnace section 514 behind the first longitudinal magnetic induction heating furnace section 512 and the transverse magnetic induction heating furnace section 513, the temperature difference area at the edge of the strip steel generated by the combined heating of the longitudinal magnetic induction heating and the transverse magnetic induction heating can be supplemented with heat, so that the condition of non-uniformity of the temperature in the width direction of the strip steel is reduced or avoided, the quenching quality of the strip steel is obviously improved, the uniform uniformity of the tissue and carbide precipitation in the width direction of the strip steel is improved, and the performance uniformity of the product in the width direction is ensured.
The first edge heating mechanism preferably also adopts a magnetic induction heating technology, and specifically, the first edge heating mechanism comprises a first edge magnetic induction heater arranged on the corresponding side of the furnace body and a first magnetic shielding structure for limiting the magnetic field of the first edge magnetic induction heater to the corresponding edge of the strip steel. The first magnetic shielding structure selectively shields part of the magnetic field, and the part of the magnetic field is allowed to extend along a set direction, so that the magnetic field can act on the edge area to be heated of the strip steel, and the direction of the magnetic field is consistent with a preset direction, for example, the heating is carried out along the width direction or the length direction of the strip steel. Through the magnetic field regulating ability of the first edge magnetic induction heater and the selective shielding effect cooperation of the first magnetic shielding structure, better magnetic field regulating ability can be obtained, and the magnetic induction heating effect with specified direction and specified intensity is realized. The first magnetic shielding structure can be, for example, a magnetic field shielding case and a magnetic field channel is formed on the magnetic field shielding case, and in another embodiment, the first magnetic shielding structure comprises a first shielding copper plate arranged on the corresponding side of the furnace body, the plate surface of the first shielding copper plate is parallel to the running direction of the strip steel, and obviously, the first shielding copper plate is arranged at a position which enables the magnetic field of the first edge magnetic induction heater to act on the edge area to be heated of the strip steel. In a preferred embodiment, the magnetic field width constrained by the first magnetic shielding structure is 45-60 mm, preferably about 50mm, that is, one side boundary for supplementing heat to the strip steel edge is the strip steel edge, and the other side boundary is 45-60 mm away from the strip steel edge, so that the temperature difference region at the strip steel edge can be better covered. In an alternative, the first edge electromagnetic induction heater may be driven by a moving trolley to be close to or far from a strip steel running channel, so as to switch the first edge electromagnetic induction heater between a working state and a standby state, and adjust a target magnetic field acting position of the first edge electromagnetic induction heater according to a specific working condition, wherein: if the first magnetic shielding structure is static shielding, different edge width ranges of strip steel can be heated by driving the first edge electromagnetic induction heater to move, or strip steel heating operation with different width specifications can be adapted; if the first magnetic shielding structure is dynamic shielding, the width and/or direction of the constrained magnetic field can be adjusted, and the movement of the first edge electromagnetic induction heater is combined, so that the magnetic field heating area can be controlled more accurately, and the heating uniformity effect of the edge of the strip steel is improved.
As shown in fig. 2, an inlet seal chamber 511 is provided on the inlet side of the furnace body of the strip steel quenching apparatus, and outlet seal chambers 516 are provided on the outlet side of the furnace body, so as to ensure the stability of the temperature field in the furnace.
Further optimize above-mentioned belted steel tempering installation, tempering heating section 53 still includes second limit portion heating furnace section 533, second limit portion heating furnace section 533 arrange in second indulge magnetic induction heating furnace section 532 with between second soaking furnace section 534, second limit portion heating furnace section 533 includes two sets of second limit portion heating mechanism that are used for heating belted steel limit portion, and two sets of second limit portion heating mechanism lists in furnace body transmission side and operation side separately. By arranging the second edge heating furnace section 533 behind the second longitudinal magnetic induction heating furnace section 532, the edge temperature difference region of the strip steel generated by longitudinal magnetic induction heating can be heated, so that the condition of temperature nonuniformity in the width direction of the strip steel is reduced or avoided, the tempering quality of the strip steel is obviously improved, the uniform precipitation consistency of the hot-rolled or cold-rolled strip steel in the width direction tissue and carbide is improved, and the performance consistency of the product in the width direction is ensured. Similarly, the second side heating mechanism comprises a second side magnetic induction heater arranged on the corresponding side of the furnace body and a second magnetic shielding structure used for limiting the magnetic field of the second side magnetic induction heater on the corresponding side of the strip steel. Selectively shielding part of the magnetic field through a second magnetic shielding structure, allowing part of the magnetic field to extend along a set direction, so that the magnetic field can act on the edge region to be heated of the strip steel, and the direction of the magnetic field accords with a preset direction, for example, heating is carried out along the width direction or the length direction of the strip steel; through the magnetic field regulating ability of the second edge magnetic induction heater and the selective shielding effect of the second magnetic shielding structure, better magnetic field regulating ability can be obtained, and the magnetic induction heating effect with specified direction and specified strength is realized. The second magnetic shielding structure can be, for example, a magnetic field shielding case and a magnetic field channel is formed on the magnetic field shielding case, and in another embodiment, the second magnetic shielding structure includes a second shielding copper plate arranged on the corresponding side of the furnace body, the plate surface of the second shielding copper plate is parallel to the running direction of the strip steel, and obviously, the second shielding copper plate is arranged at a position which enables the magnetic field of the second side magnetic induction heater to act on the region of the to-be-heated side of the strip steel. In a preferred embodiment, the magnetic field width constrained by the second magnetic shielding structure is 45-60 mm, preferably about 50mm, that is, one side boundary for supplementing heat to the strip steel edge is the strip steel edge, and the other side boundary is 45-60 mm away from the strip steel edge, so that the temperature difference region at the strip steel edge can be better covered. Similarly, the second edge electromagnetic induction heater is preferably driven by the traveling carriage to be close to or far from the strip running passage.
The strip steel tempering device is further optimized, the cooling mechanism configured in the tempering and cooling section 54 comprises a circulating gas injection cooling mechanism 541, namely, heated gas after the strip steel is cooled in the device is extracted by a circulating fan, cooled by a heat exchanger and then changed into cold gas, and the cold gas is injected to the upper surface and the lower surface of the strip steel by the circulating fan at certain pressure, so that the newly increased degree of an oxide layer of the strip steel can be remarkably reduced. The temperature of the strip steel can be rapidly cooled to 500 ℃ by the circulating gas injection cooling mechanism 541. Preferably, the circulating gas injection cooling mechanism 541 is arranged in the furnace body of the tempering heating section 53 and is located at the tail part of the furnace body; based on the structure, on one hand, the newly-added oxide layer of the strip steel can be further reduced, and on the other hand, the compactness of the strip steel tempering device can be further improved. Similarly, as shown in fig. 2, an inlet seal chamber 531 is provided at the furnace inlet side of the strip tempering device, and outlet seal chambers 535 are provided at the furnace outlet side, so as to ensure the stability of the temperature field in the furnace; and the circulating gas injection cooling section is sealed by the outlet sealing chamber 535 of the furnace body, so that the number of sealing equipment can be reduced, and the equipment cost is reduced. Further preferably, as shown in fig. 2, the cooling mechanism of the tempering cooling stage 54 further includes an external cooling mechanism 542, and the external cooling mechanism 542 employs an air-blowing cooling mechanism and/or a water-spraying cooling mechanism to cool the strip steel from about 500 ℃ to the normal temperature.
In the above-described quenching apparatus for a strip steel, it is preferable to adopt the following cooling scheme:
as shown in fig. 3, a quenching cooling apparatus is provided, which includes a plurality of cooling boxes 521 sequentially arranged along the running direction of the strip steel, an intermediate tension roller 523 is disposed between two adjacent cooling boxes 521, a wringing roller 524 is disposed at the outlet side of the tail end cooling box 521, and a quenching cooling mechanism 522 is disposed in the cooling boxes 521, and the cooling mechanism includes an aerosol cooling mechanism and/or a water spray cooling mechanism. Wherein, preferably, an inlet pinch roll 525 for pinching the strip steel for stable cooling is disposed at an inlet side of the head end cooling tank 521; it is understood that a roller conveyor is arranged in each cooling box 521 to support the strip.
The tension control on the running of the strip steel can be realized through the middle tension roller 523, the rigidity of the strip steel is improved, the strip shape of the strip steel is well controlled, and the large strip shape change caused by quenching and cooling is avoided, so that the quality of the strip steel and the product performance are improved. The intermediate tension rollers 523 are preferably provided with at least two groups to realize tension segmented control, so that the tension can be correspondingly controlled according to the quenching and cooling process of the strip steel, the strip shape of the strip steel can be better controlled, and the strip shape defect caused by the internal stress in the cooling process of the strip steel can be prevented; the number of the cooling boxes 521 is preferably not less than three. Further, the intermediate tension roller 523 is driven by a variable frequency motor; in an alternative scheme, the intermediate tension roller 523 includes an upper movable roller and a lower fixed roller, and the upper movable roller can be driven by a driving device such as a hydraulic cylinder to lift, so that the roll gap of the intermediate tension roller 523 can be adjusted as required.
The wringing roller 524 can partially remove the residual cooling water on the surface of the strip steel, and the wringing roller 524 is conventional equipment in the field of metallurgy, and the specific structure is not described herein. Further, as shown in fig. 3, a drying unit 526 is arranged at the outlet side of the wringing roller 524, so that residual water stains on the surface of the strip steel can be further removed, and the surface quality of the strip steel is ensured; the drying unit 526 may be dried by hot air, and for example, includes a drying box and a hot air supply pipe disposed on the drying box.
It can be understood that the above-mentioned aerosol cooling mechanism includes an aerosol cooling nozzle, and the aerosol cooling nozzle can adopt a conventional two-fluid nozzle, and the cooling water is formed into atomized water under the action of high-pressure gas; the water spray cooling mechanism comprises a spray nozzle, and cooling water can form atomized water under the mechanical action. The atomized cooling medium is used for cooling the strip steel, the cooling effect on the strip steel is good, the quenching cooling parameters such as the quenching cooling rate and the final cooling temperature of the strip steel are easy to control, so that good strip steel quality and shape are obtained, the requirements of continuous quenching or isothermal quenching of the strip steel can be well met, and particularly the production of thin-specification strip steel is realized. Wherein, the control of the speed and the final cooling temperature of the strip steel cold area can be controlled by accurately controlling the amount of cooling water, the cooling time and the like.
In this embodiment, preferably, a mist cooling mechanism is used, and the atomization effect of the cooling water is good. As shown in fig. 3, a mist discharge pipe 527 is arranged on the cooling box 521, and the gas medium in the cooling box 521 is pumped away by the action of a draught fan; a gas-water separation device can be arranged at the mist outlet of the cooling box 521.
Continuing above-mentioned quenching cooling arrangement, quenching cooling mechanism 522 is including arranging in the upper portion cooling unit of belted steel operation passageway top and arranging in the lower part cooling unit of belted steel operation passageway below, upper portion cooling unit with the lower part cooling unit all includes along a plurality of cooling nozzle 5221 of belted steel operation passageway width direction interval arrangement, cooling nozzle 5221 adopts aerial fog cooling nozzle or water smoke nozzle. The upper cooling unit is used for cooling the upper surface of the strip steel, the lower cooling unit is used for cooling the lower surface of the strip steel, and the upper cooling unit and the lower cooling unit are matched to obtain the required cooling rate and the required final cooling temperature of the strip steel and improve the uniformity of strip steel cooling.
In a further preferred scheme, each group of cooling units comprises a middle nozzle for cooling the middle of the strip steel and an edge nozzle for cooling the edge of the strip steel, each middle nozzle of each group of cooling units is arranged on a first medium supply pipe, each edge nozzle of each group of cooling units is arranged on a second medium supply pipe, namely, the middle cooling of the strip steel and the edge cooling of the strip steel are independent from each other, different cooling rates can be adopted for different areas of the strip steel in a targeted manner, the cooling uniformity in the width direction of the strip steel is ensured, so that a good strip steel shape is obtained, and the consumption of the cooling medium can be saved.
Further preferably, as shown in fig. 4, in the upper cooling unit, a first water baffle 5222 is disposed below at least part of the cooling nozzles 5221, at least part of the plate bodies of the first water baffle 5222 overlaps with the spraying area of the corresponding cooling nozzles 5221, or at least part of the plate bodies of the first water baffle 5222 extends to the spraying path of the corresponding cooling nozzles 5221, on one hand, the spraying range of the cooling nozzles 5221 can be adjusted by the first water baffle 5222, so that the cooling effect of the upper cooling unit can be adjusted according to different strip steel conditions, and on the other hand, the cooling width of the upper cooling unit can be adjusted to meet the quenching cooling requirements of strip steels with different widths. It will be appreciated that the first dam 5222 described above is disposed against the edge nozzles, particularly the outermost edge nozzles. Further, it is possible to design at least a portion of the first water baffle 5222 to have an adjustable overlapping area with the spray area of the corresponding cooling nozzle 5221, which is preferable for the cooling effect and/or the cooling width of the upper cooling unit; in one embodiment, the first water baffle 5222 is configured with a lifting driving unit, for example, a linear driving device such as an air cylinder drives the first water baffle 5222 to lift, so as to adjust the shielding area of the cooling nozzle 5221 by the first water baffle 5222.
Further preferably, as shown in fig. 4, the first water baffles 5222 are trough-shaped plates with two wide sides and a low middle, so that the cooling water blocked by the first water baffles 5222 can be prevented from dripping onto the surface of the strip again, and the first water baffles 5222 in the trough shape can drain and recover the blocked cooling water.
Similarly, the water retaining structure may be adopted in the lower cooling unit to adjust the cooling effect and/or the cooling width of the lower cooling unit, that is, a second water retaining plate 5223 is provided above at least part of the cooling nozzles 5221, and at least part of the plate body of the second water retaining plate 5223 overlaps with the spraying area of the corresponding cooling nozzle 5221. The second water baffle 5223 can be fixedly installed or movably installed.
EXAMPLE III
The embodiment of the present invention provides a strip steel reeling mechanism 9, which can be used in the first embodiment and is used as a collection scheme of a product collection unit therein.
As shown in fig. 5 and 6, the strip coiling mechanism 9 comprises a coiler, a steering pinch roll 92 and an uncoiling trolley 96, wherein the steering pinch roll 92 is connected with the coiler through a strip threading guide plate, and a bending machine 93 is arranged on the incoming side of the steering pinch roll 92.
The coiler, the steering pinch roll 92 and the coil stripper 96 are conventional equipment in the field, and the specific structure is not described in detail here.
The existing equipment capable of bending the strip steel is suitable for the embodiment. In a preferred embodiment, as shown in fig. 5 and 6, the bending machine 93 includes a housing and a plurality of bending rollers disposed in the housing, wherein a portion of the bending rollers are disposed above the strip steel running channel, the remaining bending rollers are disposed below the strip steel running channel, and each bending roller is disposed along the strip steel running direction in a staggered manner and is respectively connected to a lifting driving mechanism. The bending operation and the bending degree of the strip steel can be controlled by controlling the height position of each bending roller; particularly, the bending amount of the strip steel at the corresponding position is controlled by controlling the height position of each bending roller, so that the aim of straightening the strip steel can be fulfilled. In this embodiment, a 4-roll bending machine 93 is adopted, and two bending rolls are respectively arranged above and below the strip steel running channel.
Further, as shown in fig. 5 and 6, at least one auxiliary pressure roller 95 is disposed around the winding drum 91 of the winding machine, an axial direction of the auxiliary pressure roller 95 is parallel to an axial direction of the winding drum 91, and the auxiliary pressure roller 95 is provided with an auxiliary pressure roller 95 driving unit so as to have a working position in rolling contact with the steel coil 97 and a standby position away from the steel coil 97. The auxiliary pressure roller 95 driving unit is preferably driven by a hydraulic cylinder, and may be a mode of driving the auxiliary pressure roller 95 to swing to switch between the working position and the standby position, or a mode of driving the auxiliary pressure roller 95 to move linearly to switch between the working position and the standby position; in this embodiment, the latter manner is adopted, that is, the auxiliary pressing roller 95 moves linearly between the working position and the standby position, so that the pressing effect on the strip steel is better; further, the auxiliary pressing roller 95 moves linearly along the radial direction of the winding drum 91, that is, the extension line of the moving path of the auxiliary pressing roller 95 passes through the axis of the winding drum 91, and along with the change of the diameter of the steel coil 97, the pressing position of the auxiliary pressing roller 95 can be kept unchanged, which is convenient for precise control.
In a preferred embodiment, as shown in fig. 5 and 6, the auxiliary pressing rollers 95 are multiple and sequentially arranged along the circumferential direction of the winding drum 91, and obviously, the auxiliary winding effect can be further improved by using multiple auxiliary pressing rollers 95, so that the strip steel is more attached to the winding drum 91. In one embodiment, as shown in fig. 5 and 6, the working position of each auxiliary pressing roller 95 is distributed between the 6 o ' clock and 12 o ' clock positions of the steel coil 97, and since the coil discharging car 96 is generally required to be arranged below the 6 o ' clock position of the steel coil 97, the auxiliary pressing rollers 95 need to avoid the position or one of the auxiliary pressing rollers 95 is arranged on the coil discharging car 96; the above solution is particularly suitable for the upper roll-up mode. Of course, for the lower winding scheme, the arrangement position of each auxiliary pressing roller 95 may also be designed accordingly, for example, the working position of each auxiliary pressing roller 95 is distributed between the 9 o 'clock and 3 o' clock positions of the steel coil 97.
Alternatively, the working position of one of the auxiliary pressing rollers 95 is located near the initial position of the nip of the winding drum 91, for example, for the case of the upper winding scheme and the working positions of the auxiliary pressing rollers 95 are distributed between 6 o ' clock and 12 o ' clock positions of the steel coil 97, the working position of one of the auxiliary pressing rollers 95 may be designed to be located at 12 o ' clock position of the steel coil 97. The strip steel can be attached to the winding drum 91/the steel coil 97 during winding, and the problems of bulging and the like near a jaw during winding of steel grades such as high-strength steel and the like can be avoided.
In particular, the coil discharging vehicle 96 is provided with a carrier roller adapted to be in rolling contact with the steel coil 97, and when the carrier roller is in contact with the steel coil 97 and each auxiliary pressing roller 95 is in the working position, the carrier roller and each auxiliary pressing roller 95 are combined to form a roller assisting set; at the last stage of coiling, the auxiliary rollers 95 and the carrier rollers on the coil stripper 96 can be combined to form an auxiliary roller group to assist in completing the coiling of the tail of the strip, so that the auxiliary roller group has the function of a coil wrapper.
The strip threading guide is used to guide the strip to the coiler at the initial and final coiling stages, following the strip coiling mechanism 9. In one embodiment, as shown in fig. 5 and 6, the threading guide includes an upper guide 941 and a lower guide 942 arranged on both upper and lower sides of the steel wire, and the upper guide 941 and the lower guide 942 are respectively connected to guide driving units; the so-called strip design steel wire is the strip steel wire between the steering pinch roll 92 and the winding drum 91 during normal winding, and is the expected running channel of the strip steel between the steering pinch roll 92 and the winding drum 91; the guide plate driving unit can adopt conventional hydraulic cylinders and other driving devices, and the specific guide plate driving mode is conventional in the field and is not described herein. The upper guide plate 941 and the lower guide plate 942 are matched to limit the upper surface and the lower surface of the strip steel respectively, so that a guide crack can be formed between the upper surface and the lower surface, the strip steel can be accurately guided to a coiling machine, and especially for coiling high-strength steel, the problem of difficult coiling caused by the shape of a high-strength steel plate can be solved to a certain extent. Further preferably, as shown in fig. 5 and 6, a guiding roller (not shown) is provided at the end of the upper guide plate 941 to make the strip steel adhere to the lower guide plate 942 as much as possible, so as to facilitate the strip steel winding, and especially to smoothly and accurately guide the high-strength strip steel to the nip of the reel 91 at the initial winding stage. Optionally, the upper guide plate 941 and the lower guide plate 942 are both telescopic guide plates, so that after the upper guide plate 941 and the lower guide plate 942 clamp the strip steel, they can move forward along with the strip steel synchronously by their stretching operations, thereby ensuring the clamping and guiding effect on the strip steel.
The strip steel coiling mechanism 9 provided by the embodiment of the invention has the advantages that by arranging the bending machine 93, (1) strip steel can be straightened at the initial coiling stage, the strip steel is prevented from warping or lowering head to damage a strip threading guide plate, and the strip steel, particularly high-strength steel, can smoothly and accurately enter a jaw of the winding drum 91; (2) at the final stage of coiling, because the sheared strip tail is free and has no tension, the strip steel is bent by the bending machine 93 to generate plastic deformation to generate energy consumption, and the energy consumption can provide back tension for coiling; meanwhile, the strip steel is plastically deformed by the bending machine 93, and the elastic curvature reducing diameter of the strip steel coming out of the bending machine 93 is slightly larger than the radius of the currently coiled steel coil 97, so that after the strip steel coil 97 is taken, the rebound force of the strip steel on the outer ring can be greatly reduced, and the subsequent operations of bundling and the like of the steel coil 97 are facilitated. Through setting up supplementary compression roller 95, can make belted steel paste on reel 91/coil of strip 97 when batching, improve belted steel's the batch effect, can avoid near the swell scheduling problem of keeping silent when steel grades such as high-strength steel batch.
In a preferred embodiment, as shown in fig. 7, the jaw of the winding drum 91 includes a sector plate 911, the sector plate 911 is formed with a groove, a fixed jaw plate 912 is disposed at a groove wall of one side of the groove, a movable jaw plate 913 and a jaw driving unit 914 for driving the movable jaw plate 913 to approach or separate from the fixed jaw plate 912 are disposed in the groove, an outlet guide plate 915 is disposed at a groove wall of the other side of the groove, a jaw steel surface of the fixed jaw plate 912 is disposed obliquely, and an outer end of the jaw steel surface is located at a side of an inner end of the fixed jaw plate which is close to the outlet guide plate 915, and an outer surface of the outlet guide plate 915 is an arc-shaped guide surface and a space which is enclosed by the fixed jaw plate 912 is gradually expanded from inside to outside.
Preferably, the jaw driving unit 914 is a hydraulic cylinder, and a hydraulic jaw is adopted, so that a large clamping force can be increased, on one hand, the initial coiling tension of the strip steel, especially the high-strength steel, can be met, and on the other hand, the depth of the strip head entering the jaw can be reduced, so that the rebound force of the strip steel, especially the high-strength steel, is reduced, and the situation that the strip head protrudes out of the coil is avoided. Alternatively, as shown in fig. 7, the jaw driving unit 914 is fixedly installed at the bottom of the groove.
In one embodiment, a plurality of saw teeth are formed on a jaw steel surface of the movable jaw plate 913, and it is further preferable that the jaw steel surface of the movable jaw plate 913 is designed to be a saw tooth surface; the steel surface of the serrated jaw can increase the friction force between the serrated jaw and the strip steel, and the jaw effect on the strip steel is improved.
Optionally, the steel surface of the fixed jaw plate 912 is smooth, so that the strip head can be more easily discharged from the jaw during the coil stripping process. The saw-tooth-shaped steel surface of the movable jaw plate 913 is matched with the movable jaw plate, so that reliable clamping of the strip steel is guaranteed, and meanwhile, coil stripping operation of the coiling machine is facilitated.
As can be understood, after the strip is clamped by the fixed jaw plate 912 and the movable jaw plate 913, the strip exits the jaws through the exit guide plate 915 and is wound on the reel 91; the outer surface of the outlet guide plate 915 is used for contacting and supporting the strip steel; the jaw steel face of the fixed jaw plate 912 is inclined towards the groove wall at the other side of the groove, the jaw steel face and the groove bottom of the groove form a triangular space which gradually expands from inside to outside, and the outlet guide plate 915 gradually bulges towards the side of the groove opening from the groove bottom of the groove, so that the strip steel is smoothly attached to the outlet guide plate 915. Based on the structure, the design of the outlet guide plate 915 ensures that the strip steel does not have large bending, turning and the like as much as possible when the strip steel is discharged from the jaw, thereby reducing the plastic deformation when the strip steel is discharged from the jaw, preventing the strip steel from being broken due to the generation of cracks on the surface of the strip steel, reducing the resilience of the strip steel and reducing the difficulty of discharging the strip steel from the jaw.
Further preferably, the arc-shaped guide surface comprises a first arc segment and a second arc segment which have different curvatures, the second arc segment has the same curvature as the outer surface of the adjacent sector plate 911 and is smoothly spliced, and the first arc segment is spliced at the other end of the second arc segment (i.e. the end close to the fixed jaw plate 912); based on the structure, the strip steel of the jaw can be smoothly attached to the sector plate 911/the winding drum 91.
To facilitate the arrangement of the jaw driving unit 914 and the exit guide plate 915, the exit guide plate 915 can be grooved to accommodate the jaw driving unit 914; or two sets of jaw driving units 914 are arranged, and the two sets of jaw driving units 914 are respectively arranged at two ends of the outlet guide plate 915; and other arrangements, which are not described in detail herein.
Example four
The embodiment of the invention provides a heat treatment method for hot-rolled high-strength steel, which adopts the fully continuous heat treatment production system for the hot-rolled high-strength steel provided by the first embodiment to produce the hot-rolled high-strength steel, wherein,
(1) when the steel material is quenched, rapidly heating the steel material to 750-1200 ℃ at the speed of 15-30 ℃/s, and preserving heat for 2-8 minutes to obtain the austenite structure of the steel material in a target form, preferably to obtain a uniform and fine austenite structure; particularly, by adopting the induction quenching heating method in the second embodiment, based on the rapid heating technology, the austenite phase transformation incubation period can be shortened, and the austenite nucleation rate can be increased, so that a uniform and fine austenite structure can be obtained, and a structure basis is provided for good mechanical properties of a final product.
(2) And cooling the steel material after quenching heating to a target quenching final cooling temperature by adopting a multi-stage quenching cooling mode to obtain a quenching state martensite structure with a target shape, preferably a uniform and fine quenching state martensite structure. By adopting a multi-section quenching cooling mode, the internal stress generated in the quenching cooling process of the steel strip or the steel plate can be greatly reduced on the premise of ensuring the hardenability, and the serious plate shape defect is avoided; for example, the quenching cooling method in the second embodiment is adopted.
(3) When the steel material is tempered, heating the steel material to 150-700 ℃, and preserving heat for 1-5 min; so as to eliminate the internal stress of the steel material, ensure the corresponding structure transformation, improve the plasticity and toughness of the high-strength steel and obtain the reasonable matching of the strength, the plasticity and the toughness. For example, the magnetic induction tempering heating method in the second embodiment is adopted.
(4) And during tempering and cooling, cooling the steel material to room temperature by adopting a sectional cooling mode to obtain a stable tempered structure at room temperature. Particularly, by adopting the tempering cooling scheme in the second embodiment, the cooling of the high-temperature section above 250-350 ℃ adopts the protective gas circulation blowing cooling technology, so that the strip steel is rapidly cooled at 30-50 ℃/s, the tempering brittleness is avoided, and the oxidation of the strip steel is prevented; and cooling the strip steel in a low-temperature section below 250-350 ℃ to cool the strip steel to room temperature in an air cooling/water cooling mode, so that the internal tempering stress is reduced, and a stable tempering state structure is obtained.
In addition, based on the strip winding mechanism 9 provided in the third embodiment, the method for winding the high-strength strip includes:
a. as shown in fig. 5, in the initial winding stage, the strip steel is straightened by the bending machine 93, so that the strip steel is prevented from being warped or falling to damage the strip threading guide plate, and the strip steel, especially high-strength steel, can smoothly and accurately enter the jaw of the winding drum 91; the specific straightening operation has been described in the first embodiment above and will not be described in detail here.
The strip is guided to the reel 91 by the turning pinch roll 92 and the threading guide, which is conventional in the art and will not be described in detail;
the jaws of the winding drum 91 clamp the strip steel, the winding drum 91 expands to establish initial tension, and when the jaws sequentially pass through the working positions of the auxiliary compression rollers 95, the auxiliary compression rollers 95 correspondingly press the strip steel onto the winding drum 91, so that the coiler can ensure the fitting effect of the strip steel winding without a full tension state. After a plurality of circles of strip steel are coiled (preferably 3-5 circles), the coiling machine is operated in full tension;
b. as shown in fig. 6, at the final stage of coiling, the strip steel is bent by the bending machine 93; because the sheared strip tail is free and has no tension, the strip steel is bent by the bending machine 93 to generate plastic deformation to generate energy consumption, and the back tension can be provided for coiling; meanwhile, the strip steel is plastically deformed by the bending machine 93, and the elastic curvature reducing diameter of the strip steel from the bending machine 93 is slightly larger than the radius of the currently coiled steel coil 97, so that the rebound force of the strip steel on the outer ring can be reduced to a great extent after the strip steel is coiled, and the subsequent operations of bundling and the like of the steel coil 97 are facilitated.
Specifically, when the decoiling signal is received, the threading guide is in place (for the above-described structure including the upper guide 941 and the lower guide 942, only the lower guide 942 may be raised), the pinch rolls are pressed down, and the strip steel is bent by the bending machine 93; and after the cutting operation of the cutting scissors is finished, the coiling machine continues to coil to finish the coiling of the strip tail. Preferably, each auxiliary pressing roller 95 and the supporting roller on the coil discharging car 96 are combined to form a coil assisting roller set to assist in completing the coiling of the strip tail, that is, each auxiliary pressing roller 95 is pressed against the steel coil 97, the coil discharging car 96 ascends until the supporting roller is contacted with the steel coil 97, and the coil assisting device formed by each auxiliary pressing roller 95 and the supporting roller can effectively prevent the strip tail from rebounding in a tension-free state.
Understandably, in the normal coiling process, each auxiliary press roll 95 is in a standby position, the strip threading guide plate is also in an idle position, the pinch roll is opened, and the bending machine 93 is opened. When the operation of coil stripping is finished, after the coil stripping vehicle 96 contacts the strip steel, the jaw is opened, the reel 91 is reduced by 20 percent and then rotates forward by 45 degrees, so that the strip head is discharged from the jaw, and then the strip head is reduced to the minimum coil diameter after being increased in diameter again.
In the hot-rolled high-strength steel heat treatment method, the finished steel material can be ensured to have good surface quality and shape through various strip steel surface protection measures and shape improvement measures configured in the whole system line; meanwhile, the good surface quality and the good plate shape enable the strip steel to have good temperature uniformity in the heating and cooling processes, and further ensure that the product has good uniformity of structure and mechanical property.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The utility model provides a hot rolling high strength steel full continuous heat treatment production system which characterized in that: the steel material tempering device comprises an uncoiler, a welding machine, a quenching device, a tempering device, a slitting shear and a product collecting unit which are sequentially connected and arranged along the running direction of a steel material, wherein the quenching device comprises a quenching heating section and a quenching cooling section which are sequentially arranged along the running direction of the steel material, and the tempering device comprises a tempering heating section and a tempering cooling section which are sequentially arranged along the running direction of the steel material.
2. The hot-rolled high-strength steel full-continuous heat treatment production system according to claim 1, characterized in that: the quenching heating section comprises a first longitudinal magnetic induction heating furnace section, a transverse magnetic induction heating furnace section and a first soaking furnace section which are sequentially arranged along the running direction of the steel material.
3. The hot-rolled high-strength steel full-continuous heat treatment production system according to claim 2, characterized in that: the quenching heating section further comprises a first edge heating furnace section, the first edge heating furnace section is arranged between the transverse magnetic induction heating furnace section and the first soaking furnace section, the first edge heating furnace section comprises two sets of first edge heating mechanisms used for heating the edge of the strip steel, and the two sets of first edge heating mechanisms are respectively arranged on the transmission side and the operation side of the furnace body.
4. The hot-rolled high-strength steel full-continuous heat treatment production system according to claim 1, characterized in that: the quenching cooling section comprises a plurality of cooling boxes which are sequentially arranged along the running direction of the strip steel, a middle tension roller is arranged between every two adjacent cooling boxes, a cooling mechanism is arranged in each cooling box, and each cooling mechanism comprises an aerial fog cooling mechanism and/or a water spray cooling mechanism.
5. The hot-rolled high-strength steel full-continuous heat treatment production system according to claim 1, characterized in that: the tempering heating section comprises a second longitudinal magnetic induction heating furnace section and a second soaking furnace section which are sequentially arranged along the running direction of the strip steel.
6. The hot-rolled high-strength steel full-continuous heat treatment production system according to claim 5, characterized in that: the tempering heating section further comprises a second edge heating furnace section, the second edge heating furnace section is arranged between the second longitudinal magnetic induction heating furnace section and the second soaking furnace section, the second edge heating furnace section comprises two groups of second edge heating mechanisms used for heating the edges of the strip steel, and the two groups of second edge heating mechanisms are respectively arranged on the transmission side and the operation side of the furnace body.
7. The hot-rolled high-strength steel full-continuous heat treatment production system according to claim 1, characterized in that: the tempering cooling section comprises a tempering cooling front section and a tempering cooling rear section, wherein the tempering cooling front section is provided with a circulating gas injection cooling mechanism, and the tempering cooling rear section is provided with an air injection cooling mechanism and/or a water spray cooling mechanism.
8. The hot-rolled high-strength steel full-continuous heat treatment production system according to claim 1, characterized in that: the product collecting unit comprises a strip steel coiling mechanism connected with the slitting shear, the strip steel coiling mechanism comprises a coiling machine, a steering pinch roll and a coil unloading car, the steering pinch roll is connected with the coiling machine through a strip threading guide plate, and a bending machine is arranged on the incoming material side of the steering pinch roll.
9. The hot-rolled high-strength steel full-continuous heat treatment production system according to claim 8, characterized in that: at least one auxiliary compression roller is arranged around the winding drum of the winding machine, the axial direction of the auxiliary compression roller is parallel to the axial direction of the winding drum, and the auxiliary compression roller is provided with an auxiliary compression roller driving unit so as to have a working position in rolling contact with the steel coil and a standby position far away from the steel coil.
10. A hot-rolled high-strength steel heat treatment method characterized by producing by using the hot-rolled high-strength steel full-continuous heat treatment production system according to any one of claims 1 to 9,
when the steel material is quenched, rapidly heating the steel material to 750-1200 ℃ at the speed of 15-30 ℃/s, and preserving heat for 2-8 minutes to obtain the austenite structure of the steel material in a target form; cooling the steel material after quenching heating to a target quenching final cooling temperature by adopting a multi-section quenching cooling mode to obtain a quenching state martensite structure in a target shape;
when the steel material is tempered, heating the steel material to 150-700 ℃, and preserving heat for 1-5 min; and cooling the steel material to room temperature by adopting a sectional cooling mode to obtain a tempered structure stable at room temperature.
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| CN112139282A (en) * | 2020-09-02 | 2020-12-29 | 中冶南方工程技术有限公司 | Strip steel coiling system, high-strength steel coiling method and high-strength steel production line |
| CN113894159A (en) * | 2021-09-30 | 2022-01-07 | 中冶赛迪上海工程技术有限公司 | Hot-rolled strip steel heat treatment processing method |
| CN114029746A (en) * | 2021-10-27 | 2022-02-11 | 中重科技(天津)股份有限公司 | Hot rolling strip steel production line fusion welding continuous production system |
| CN114799782A (en) * | 2022-04-12 | 2022-07-29 | 乐清市芙蓉工具一厂 | Machining equipment for drill bit |
| WO2024036711A1 (en) * | 2022-08-19 | 2024-02-22 | 中冶南方工程技术有限公司 | Multifunctional high-strength steel sheet or strip heat treatment production system and method |
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