CN115106375A - Multi-fire forming process and production system for high-alloy material - Google Patents
Multi-fire forming process and production system for high-alloy material Download PDFInfo
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- CN115106375A CN115106375A CN202210846135.4A CN202210846135A CN115106375A CN 115106375 A CN115106375 A CN 115106375A CN 202210846135 A CN202210846135 A CN 202210846135A CN 115106375 A CN115106375 A CN 115106375A
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- 238000000034 method Methods 0.000 title claims abstract description 73
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- 239000002994 raw material Substances 0.000 claims description 24
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/02—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
- B21B1/04—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing in a continuous process
Abstract
The invention discloses a multi-fire forming process and a production system of a high alloy material, wherein the process comprises the following steps: heating the continuous casting blank/steel ingot to a specified tapping temperature, rolling the continuous casting blank/steel ingot into an intermediate section blank with a specified section size through a cogging mill, controlling the temperature of the blank to be above the specified tapping temperature in the whole rolling process, if the temperature of the blank is lower than the specified tapping temperature, performing supplementary heating, performing secondary cogging again, and performing multiple times of heating/supplementary heating in the circulation until the intermediate section blank with the specified section size is rolled out, thereby completing the multi-fire forming of cogging; heat preservation and heat supplement; and (5) continuously rolling and forming to obtain a finished product with the final section size. The invention adopts the multi-fire forming process, replaces the traditional forging and pressing equipment with the cogging mill, fully utilizes the good deformation attribute of high-alloy materials at high temperature, carries out high-efficiency short-flow production by the production process of rolling instead of forging and non-off-line, and can improve the production efficiency and capacity, reduce the production cost, and improve the yield and the product dimensional precision.
Description
Technical Field
The invention relates to the technical field of alloy material processing, in particular to a multi-fire forming process and a production system for a high alloy material.
Background
The material with high alloy content generally refers to a material formed by taking nickel, chromium, cobalt and the like as a matrix and adding iron and other alloy elements, can stably maintain the material properties under the working conditions of high temperature above 600 ℃ and heavy load, has good comprehensive capabilities of oxidation resistance, corrosion resistance, fatigue resistance, high fracture toughness and the like, and is widely applied to the fields of energy, aviation, navigation, military industry and the like as a basic functional material.
The high alloy material can be produced by electroslag smelting, steel ingot casting, forging and pressing/rolling forming processes. In order to ensure the final mechanical properties and the structural uniformity of the product, the final product is generally forged by casting a large-section steel ingot through a hydraulic press, a rapid press and other facilities or a small-section blank, and then a bar product with the final diameter is formed by rolling. Typical processing procedures in the traditional processing technology are as follows: smelting and pouring a steel ingot in an electric furnace, heating the steel ingot in a steel ingot soaking pit furnace to 1200 ℃, forging and pressing the steel ingot by a hydraulic press or a hydraulic quick forging machine, and forging the steel ingot into a small-section square billet; and after the blank is conveyed into a steel rolling workshop, the blank is heated by a heating furnace, then enters a bar machine set to roll a round steel bar with a final section, and enters a finished product warehouse for storage after finishing. Because the deformation resistance of the high-alloy material is sharply increased after the temperature is below 1000 ℃, the deformation temperature range of the high-alloy material is generally controlled between 1000 ℃ and 1200 ℃, the temperature drop is high after the high-alloy material is subjected to multiple machining deformation, multiple times of heating for temperature compensation are required, the traditional forging method needs multiple times of discontinuous heating, the flow of the machining and manufacturing procedures is long, and meanwhile, when the forging process is adopted to roll the large-section steel ingot into a small-section blank or a finished product, the yield is low, the production efficiency is low, the yield is low, and the production cost is high.
Disclosure of Invention
Based on the problems of the high-alloy material manufacturing process and the development level of the current rolling forming process and equipment, the invention provides the multi-fire forming process and the production system of the high-alloy material.
To achieve the above and other related objects, in one aspect, the present invention provides a multi-fire forming process for high alloy materials, comprising the steps of:
(1) heating, cogging and rolling: heating the raw material continuous casting slab and/or steel ingot to a specified tapping temperature, then carrying out reciprocating multi-pass high-reduction rolling through a cogging mill, rolling the large-section continuous casting slab and/or the steel ingot into a middle-section blank with a specified section size, and controlling the temperature of the blank to be higher than the specified tapping temperature in the whole rolling process;
in the multi-pass cogging rolling process, when the temperature of the blank is lower than the specified tapping temperature but the intermediate section blank with the specified section size is not rolled, the blank is cut, sized and segmented, and then is subjected to supplementary heating, and then secondary cogging is performed, so that the heating/supplementary heating is performed for multiple times in a circulating manner until the intermediate section blank with the specified section size is rolled, and the multi-fire forming of cogging is completed;
(2) heat preservation and heat supplement: cutting the intermediate section blank with the specified section size into a fixed length and a section, and then carrying out heat preservation and heat supplement;
(3) and (3) continuous rolling and forming: and continuously rolling the intermediate section blank subjected to heat preservation and heat compensation to obtain a finished product with the final section size.
Further, in the step (1), the specified tapping temperature is 1000 ℃ or higher, preferably 1000 to 1200 ℃, and more preferably 1000 ℃.
Further, in the step (1), the intermediate section blank with the specified section size is obtained through reciprocating multi-pass rolling with not less than 3 passes.
Further, in the step (1), the cross section of the continuous casting slab or the steel ingot is selected from at least one of a square cross section, a rectangular cross section and a circular cross section, the size of the square cross section is preferably 400mm to 1000mm, the size of the rectangular cross section is preferably 300 × 400mm to 800 × 1000mm, and the size of the circular cross section is preferably Φ 400mm to Φ 1500 mm.
Further, in the step (1), descaling is performed between the heating and cogging rolling steps. The steel ingot and the continuous casting billet can adopt a descaling procedure or not through a descaling device according to the requirements of a process system.
Further, after heat preservation and heat compensation, descaling is performed before continuous rolling. In the invention, whether surface descaling is carried out by the descaling device is determined according to the process requirements.
Further, in the step (1), the elongation coefficient of each deformation pass is set to be 1.1-2 in the cogging rolling process.
Further, in the step (3), in the forming process of continuous rolling, the elongation coefficient of each deformation pass is set to be 1.1-2.
Further, in the steps (1) and (2), thermal shearing equipment is adopted for carrying out fixed-length segmentation.
Further, in the step (3), the continuous rolling process comprises the working procedures of rough rolling, intermediate rolling and finish rolling.
Further, in the step (3), a shearing process is respectively arranged after rough rolling, after intermediate rolling and after finish rolling, and the shearing process is used for shearing irregular head/tail parts of the deformed rolled pieces, and/or is used for carrying out chopping treatment in case of production failure, and/or is used for carrying out multiple length segmentation.
Further, in the step (3), online temperature control is performed before and after the finish rolling, and the temperature of the rolled piece in the finish rolling forming process and after the rolling is adjusted according to the preset temperature requirement of the rolling process.
Further, the multi-fire forming process also comprises the step (4): and cooling the rolled finished product, sawing, shearing to length, checking, bundling, collecting and warehousing.
The invention also provides a multi-fire forming production system of high alloy materials, which is applied to the multi-fire forming process, the multi-fire forming production system comprises a raw material feeding unit, a heating unit, a cogging rolling unit, a shearing unit, a heat preservation and heat supplement unit and a continuous rolling forming unit which are sequentially arranged along the forming direction, the raw material feeding unit is used for feeding raw material continuous casting billets and/or steel ingots into the heating unit for heating, the cogging rolling unit comprises a cogging mill, used for rolling the large-section continuous casting billet and/or steel ingot into an intermediate-section billet with a specified section size, the shearing unit is used for shearing the fixed-length sections, the heat-preservation and heat-supplement unit is used for preserving and heating the intermediate section blank, and the continuous rolling forming unit is used for continuously rolling and forming the heat-insulated and heat-supplemented intermediate section blank into a finished product with the final section size.
Further, the raw material feeding unit comprises a continuous casting billet feeding device and a hoisting device, the continuous casting billet feeding device is used for feeding a continuous casting billet into the heating unit, and the hoisting device is used for feeding a steel ingot into the heating unit; preferably, the lifting equipment is a crane.
Furthermore, the raw material feeding unit also comprises a roller way conveying line, and the roller way conveying line is used for conveying the continuous casting billets.
Further, the raw material feeding unit further comprises a steel ingot conveying line, and the steel ingot conveying line is used for conveying steel ingots.
Further, the heating unit comprises a first heating furnace and a steel ingot soaking furnace, wherein the first heating furnace is used for heating the continuous casting billet, and the steel ingot soaking furnace is used for heating a steel ingot.
Further, the heating unit further comprises a heating furnace steel tapping mechanism, and the heating furnace steel tapping mechanism is used for taking out the continuous casting billet from the first heating furnace and placing the continuous casting billet into the cogging mill unit.
Further, the cogging mill unit further comprises a cogging mill front roller way, and the cogging mill front roller way is used for feeding the continuous casting ingot into the cogging mill.
Further, the shearing unit comprises a first shearing device, and the first shearing device is used for shearing, sizing and segmenting the medium-length discontinuous surface blank; preferably, the first shearing device is a thermal shearing apparatus.
Further, still be equipped with transition rack and collection device that rolls off the production line between the shearing unit with the heat preservation heating unit, the transition rack is used for carrying continuous casting billet, steel ingot, collection device that rolls off the production line is used for collecting and carrying continuous casting billet, steel ingot.
Further, the heat preservation heating unit comprises a second heating furnace, and the second heating furnace is used for preserving and heating the intermediate section blank.
Furthermore, the continuous rolling forming unit comprises a rough rolling unit, a middle rolling unit and a finish rolling unit which are sequentially arranged along the rolling direction.
Further, the continuous rolling forming unit further comprises a second shearing device, a third shearing device and a fourth shearing device, the second shearing device is arranged between the rough rolling unit and the intermediate rolling unit, the third shearing device is arranged between the intermediate rolling unit and the finishing rolling unit, and the fourth shearing device is arranged behind the finishing rolling unit.
Further, the multi-fire forming production system further comprises a descaling unit, wherein the descaling unit comprises a first descaling device and/or a second descaling device, the first descaling device is arranged between the heating unit and the cogging rolling unit, and the second descaling device is arranged between the heat-preservation heating unit and the continuous rolling forming unit.
Further, the multi-fire forming production system also comprises an online temperature control unit, wherein the online temperature control unit is used for performing online temperature control on the blanks before and after finish rolling, and adjusting the temperature of the rolled piece in the finish rolling forming process and after rolling according to the preset rolling process temperature requirement.
Furthermore, online temperature control unit includes at first online temperature control water tank and the online temperature control water tank of second, first online temperature control water tank sets up between well rolling mill group and the finishing mill group, the online temperature control water tank of second sets up behind the finishing mill group.
Further, many fire shaping production system still includes the cold bed, the scale saw cuts device, the inspection bundle collection unit that set gradually along the shaping direction.
As mentioned above, the multi-fire forming process and the production system of the high alloy material have the following beneficial effects:
1) short production process: the long-flow production process of traditional electric furnace-steel ingot-heating-forging-heating-rolling is changed, and the traditional production process flow is simplified.
2) The production efficiency is improved: the short-flow process of replacing forging with rolling is innovative to replace the traditional forging-rolling process, so that the production efficiency and the production capacity are improved, the yield is improved, and the production cost is reduced.
3) The dimensional accuracy of the product is improved: the dimensional accuracy of the blank is improved through a multi-pass rolling process.
4) Solves the problem of discontinuous heating, and realizes the on-line circulating multi-heating (i.e. multi-fire) and off-line-free continuous rolling forming process.
In conclusion, the invention adopts the multi-fire forming process, the large-scale cogging mill replaces the traditional forging equipment, the good deformation attribute of the high-alloy material at high temperature is fully utilized, and the high-efficiency short-flow production is carried out by the production process of replacing forging with rolling and not going off line, so that the traditional production process flow can be simplified, the production efficiency and the production capacity can be improved, the production cost can be reduced, the yield can be improved, and the product size precision can be improved.
The process and the production system provided by the invention are not only suitable for producing high-alloy materials, but also suitable for producing high-quality special steel products such as high-alloy steel, stainless steel and the like; meanwhile, the process and the production system provided by the invention are suitable for short-process forming production of round steel bar and wire rod products, and are also suitable for various forging-rolling combined processes.
Drawings
Fig. 1 is a cross-sectional view of a typical slab, ingot, shown in an exemplary embodiment of the present application.
FIG. 2 shows a schematic layout of a multi-fire forming production system for high alloy materials shown for an exemplary embodiment of the present application.
FIG. 3 shows a schematic pass diagram for a typical cogging mill in a multi-fire forming production system for high alloy materials, shown for an exemplary embodiment of the present application.
Description of reference numerals:
the device comprises a continuous casting billet feeding device 101, a roller way conveying line 102, a steel ingot conveying line 103, a first heating furnace 201, a steel ingot soaking furnace 202, a cogging mill 301, a first shearing device 401, a second heating furnace 501, a roughing mill group 601, a middle mill group 602, a finishing mill group 603, a second shearing device 604, a third shearing device 605, a fourth shearing device 606, a transition bench 701, an off-line collecting device 702, a first descaling device 801, a second descaling device 802, a first on-line temperature control water tank 901, a second on-line temperature control water tank 902, a cooling bed 1001, a sizing saw shearing device 1002 and an inspection bundling collecting unit 1003.
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.
In the following description, numerous details are set forth to provide a more thorough explanation of the embodiments of the present application, however, it will be apparent to one skilled in the art that the embodiments of the present application may be practiced without these specific details, and in other embodiments, well-known structures and devices are shown in block diagram form rather than in detail in order to avoid obscuring the embodiments of the present application.
The terms "first," "second," and the like in the description and in the claims, and the above-described drawings of embodiments of the present disclosure, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged as appropriate for the embodiments of the disclosure described herein. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.
The term "plurality" means two or more unless otherwise specified.
In the embodiment of the present disclosure, the character "/" indicates that the preceding and following objects are in an or relationship. For example, A/B represents: a or B.
The term "and/or" is an associative relationship that describes objects, meaning that three relationships may exist. For example, a and/or B, represents: a or B, or A and B.
To address the deficiencies of the prior art high alloy material manufacturing process, an exemplary embodiment of the present application illustrates a multi-fire forming process of a high alloy material, comprising the steps of:
(1) heating, cogging and rolling: heating the raw material continuous casting slab and/or steel ingot to a specified tapping temperature, carrying out reciprocating multi-pass high-reduction rolling through a cogging mill, rolling the large-section continuous casting slab and/or steel ingot into an intermediate section blank with a specified section size, and controlling the temperature of the blank to be above the specified tapping temperature in the whole rolling process;
in the process of multi-pass cogging rolling, when the temperature of the blank is lower than the specified tapping temperature but the intermediate section blank with the specified section size is not rolled, the blank is cut, sized and segmented, and then is subjected to supplementary heating, and then secondary cogging is performed, according to the requirements of a production process system (rolling regulation, rolling temperature, rolling speed and the like), the blank is subjected to heating/supplementary heating for multiple times in a circulating manner according to the section and temperature conditions of the blank until the intermediate section blank with the specified section size is rolled, and the multi-fire forming of cogging is completed;
(2) heat preservation and heat supplement: cutting the intermediate section blank with the specified section size into a fixed length and a section, and then carrying out heat preservation and heat supplement;
(3) and (3) continuous rolling and forming: and continuously rolling the intermediate section blank subjected to heat preservation and heat compensation to obtain a finished product with the final section size.
In another exemplary embodiment, in the step (1), the specified tapping temperature is 1000 ℃ or higher, preferably 1000 ℃ to 1200 ℃, and more preferably 1000 ℃.
In another exemplary embodiment, in the step (1), the intermediate section blank with the specified section size is obtained through not less than 3 times of reciprocating multi-pass rolling.
In another exemplary embodiment, as shown in fig. 1, in the step (1), the cross section of the continuous casting slab or the steel ingot is a square cross section, a rectangular cross section, a circular cross section or another cross section with a typical shape designed according to product requirements, wherein the size of the square cross section is preferably 400mm to 1000mm, the size of the rectangular cross section is preferably 300 × 400mm to 800 × 1000mm, and the size of the circular cross section is preferably Φ 400mm to Φ 1500 mm.
In another exemplary embodiment, in the step (1), between the heating and the cogging rolling process, the descaling is performed. The steel ingot and the continuous casting billet can adopt a descaling procedure or not through a descaling device according to the requirements of a process system.
In another exemplary embodiment, after holding, heat supplementing, and before continuous rolling, descaling is performed. In the invention, whether surface descaling is carried out by the descaling device is determined according to the process requirement.
In another exemplary embodiment, in the step (1), the elongation coefficient is set to 1.1-2 per deformation pass during the cogging rolling.
In another exemplary embodiment, in the step (3), the elongation coefficient of each deformation pass in the forming process of continuous rolling is set to be 1.1-2.
In another exemplary embodiment, in the above steps (1), (2), a thermal shearing apparatus is used for the sizing segmentation.
In another exemplary embodiment, in the step (3), the continuous roll forming process includes rough rolling, intermediate rolling, and finish rolling.
In another exemplary embodiment, in the step (3), after rough rolling, after intermediate rolling and after finish rolling, a shearing process is respectively provided for shearing irregular head/tail parts of the rolled piece after deformation, and/or for performing a chopping process in case of production failure, and/or for performing multiple length segmentation.
In another exemplary embodiment, in the step (3), online temperature control is performed before and after the finish rolling, and the temperature of the rolled piece during the finish rolling forming process and after the rolling is adjusted according to the preset temperature requirement of the rolling process.
In another exemplary embodiment, the multi-flame forming process further includes the step (4): and cooling the rolled finished product, sawing, shearing to length, checking, bundling, collecting and warehousing.
The embodiment of the application also provides a multi-fire forming production system of the high alloy material, which is applied to the multi-fire forming process, the multi-fire forming production system comprises a raw material feeding unit, a heating unit, a cogging rolling unit, a shearing unit, a heat preservation and heat supplement unit and a continuous rolling forming unit which are sequentially arranged along a forming direction, wherein the raw material feeding unit is used for feeding raw material continuous casting billets and/or steel ingots into the heating unit for heating, the cogging rolling unit comprises a cogging mill, the continuous rolling and forming unit is used for continuously rolling and forming the intermediate section blank subjected to heat preservation and heat supplementation into a finished product with the final section size.
In another exemplary embodiment, the raw material feeding unit comprises a continuous casting billet feeding device and a lifting device, wherein the continuous casting billet feeding device is used for feeding a continuous casting billet into the heating unit, and the lifting device is used for feeding a steel ingot into the heating unit; preferably, the handling apparatus is a crane.
In another exemplary embodiment, the raw material feeding unit further comprises a roller way transport line for transporting the continuously cast slab.
In another exemplary embodiment, the raw material feeding unit further comprises a steel ingot transport line for transporting steel ingots.
In another exemplary embodiment, the heating unit includes a first heating furnace for heating the slab and a slab soaking furnace for heating the slab.
In another exemplary embodiment, the heating unit further comprises a furnace tapping mechanism for taking out the slab from the first furnace and placing it in the breakdown mill unit.
In a further exemplary embodiment, the breakdown mill unit further comprises a breakdown mill front table for feeding the continuous or cast slab into the breakdown mill.
In another exemplary embodiment, the shearing unit comprises a first shearing device for shearing the intermediate section blank to a fixed length; preferably, the first shearing device is a thermal shearing apparatus.
In another exemplary embodiment, a transition rack and a lower line collecting device are further arranged between the shearing unit and the heat preservation and heating unit, the transition rack is used for conveying the continuous casting billets and steel ingots, and the lower line collecting device is used for collecting and conveying the continuous casting billets and the steel ingots.
In another exemplary embodiment, the holding and heating unit comprises a second heating furnace, and the second heating furnace is used for holding and heating the interrupted blank.
In another exemplary embodiment, the continuous roll forming unit includes a roughing mill train, a middle mill train, and a finishing mill train, which are arranged in sequence in the rolling direction.
In another exemplary embodiment, the continuous rolling forming unit further comprises a second shearing device, a third shearing device and a fourth shearing device, the second shearing device is arranged between the rough rolling unit and the intermediate rolling unit, the third shearing device is arranged between the intermediate rolling unit and the finishing rolling unit, and the fourth shearing device is arranged after the finishing rolling unit; preferably, the second shearing device, the third shearing device and the fourth shearing device are thermal shearing equipment.
In another exemplary embodiment, the multi-fire forming production system further comprises a descaling unit comprising a first descaling device and/or a second descaling device, the first descaling device being disposed between the heating unit and the cogging rolling unit, the second descaling device being disposed between the keep-warm heating unit and the continuous roll forming unit.
In another exemplary embodiment, the multi-fire forming production system further comprises an online temperature control unit, wherein the online temperature control unit is used for performing online temperature control on the blanks before and after finish rolling, and adjusting the temperature of the rolled piece during finish rolling forming and after finish rolling according to the preset temperature requirement of the rolling process.
In another exemplary embodiment, the on-line temperature control unit comprises a first on-line temperature control water tank arranged between the intermediate mill group and the finishing mill group and a second on-line temperature control water tank arranged after the finishing mill group, preferably, the first on-line temperature control water tank is arranged between the intermediate mill group and the finishing mill group and before the third shearing device, and the second on-line temperature control water tank is arranged after the finishing mill group and before the fourth shearing device.
In another exemplary embodiment, the multi-fire forming production system further comprises a cooling bed, a fixed-length sawing and shearing device and an inspection bundling and collecting unit which are sequentially arranged along the forming direction.
It should be noted that the multi-fire forming system for high alloy materials provided in the above embodiments and the multi-fire forming process for high alloy materials provided in the above embodiments belong to the same concept, wherein the specific manner of performing operations by each apparatus and unit has been described in detail in the method embodiments, and is not described herein again. In practical applications, the multi-flame forming system for high alloy materials provided in the above embodiments may distribute the above processes to different process units according to needs, that is, divide the internal structure of the system into different process units to complete all or part of the above described processes, which is not limited herein.
FIG. 2 shows a schematic layout of a multi-fire forming production system for high alloy materials shown for an exemplary embodiment of the present application.
In another exemplary embodiment, as shown in fig. 2, the multi-fire forming production system for high alloy materials comprises a raw material feeding unit, a heating unit, a cogging rolling unit, a shearing unit, a heat preservation and heat supplement unit, a continuous rolling forming unit, a cooling bed 1001, a sizing saw cutting device 1002, and an inspection bundling and collecting unit 1003 which are sequentially arranged along a forming direction.
The raw material feeding unit is used for feeding raw material continuous casting billets and steel ingots into the heating unit for heating, and specifically comprises a continuous casting billet feeding device 101, a roller way conveying line 102, a hoisting device and a steel ingot conveying line 103, wherein the continuous casting billet feeding device 101 is used for feeding the continuous casting billets into the heating unit, the roller way conveying line 102 is used for conveying the continuous casting billets, the hoisting device is used for feeding the steel ingots into the heating unit, and the steel ingot conveying line 103 is used for conveying the steel ingots; preferably, the handling apparatus is a crane.
The heating unit is used for heating continuous casting billet and steel ingot, and is concrete, and the heating unit includes first heating furnace 201, steel ingot soaking pit 202, heating furnace steel tapping mechanism, and first heating furnace 201 is used for heating the continuous casting billet, and steel ingot soaking pit 202 is used for heating the steel ingot, and heating furnace steel tapping mechanism is arranged in taking out the continuous casting billet from first heating furnace 201 and putting to cogging mill 301 unit.
The cogging rolling unit comprises a cogging mill 301 and a cogging mill 301 front roller way, the cogging mill 301 is used for rolling the large-section continuous casting billet and the steel ingot into an intermediate-section billet with a specified section size, and the cogging mill 301 front roller way is used for feeding the continuous casting billet and the steel ingot into the cogging mill 301.
Further, as shown in fig. 3, the model of the cogging mill 301 is a model with a roll diameter of Φ 1000mm to Φ 1800mm, and the number of the cogging mills 301 is 1 or 2 according to the blank, the capacity and the requirement of the intermediate section.
In the step (1), when the raw material is a continuous casting billet, the continuous casting billet enters the first heating furnace 201 through the continuous casting billet feeding device 101 and the roller way conveying line 102 to be heated, and after the continuous casting billet is heated to the specified tapping temperature, the continuous casting billet is discharged to a roller way in front of the cogging mill 301 through the heating furnace tapping mechanism; when the raw materials are steel ingots, the steel ingots are loaded into the steel ingot soaking pit 202 through hoisting equipment to be heated, and after the steel ingots are heated to the specified tapping temperature, the steel ingots are hoisted to the steel ingot conveying line 103 through the hoisting equipment and are conveyed to a front roller way of the cogging mill 301 through a roller way.
The shearing unit is used for shearing the cut-to-length sections, specifically, the shearing unit comprises a first shearing device 401, and the first shearing device 401 is used for shearing the cut-to-length sections of the intermediate section blank; preferably, the first shearing device 401 is a thermal shearing apparatus.
The heat preservation and heat supplement unit is used for preserving heat and heating the intermediate section blank, and specifically, the heat preservation and heating unit comprises a second heating furnace 501, and the second heating furnace 501 is used for preserving heat and heating the intermediate section blank.
The continuous rolling forming unit is used for continuously rolling and forming the heat-insulated and heat-supplemented intermediate section blank into a finished product with a final section size, and specifically comprises a rough rolling unit 601, a middle rolling unit 602 and a finishing rolling unit 603 which are sequentially arranged along the rolling direction. According to the requirements of rolling passes, each unit is set to be 4-8 rolling mills, and the rolling mills can be multi-roller precision rolling mills with 2 rollers, 3 rollers and 4 rollers. The roughing mill group 601, the intermediate mill group 602 and the finishing mill group 603 can be arranged in a continuous rolling relationship or can be arranged in a pull-apart manner, so that the speed of a rolled piece entering the intermediate mill group 602 is not limited by the speed of the roughing mill group 601. The two modes are selected and comprehensively considered according to factors such as the size of a finished product, the production capacity, the existing space condition and the like.
The continuous rolling forming unit further comprises a second shearing device 604, a third shearing device 605 and a fourth shearing device 606, wherein the second shearing device 604 is arranged between the rough rolling unit 601 and the intermediate rolling unit 602, the third shearing device 605 is arranged between the intermediate rolling unit 602 and the finishing rolling unit 603, and the fourth shearing device 606 is arranged behind the finishing rolling unit 603; preferably, the second shearing device 604, the third shearing device 605 and the fourth shearing device 606 are thermal shearing devices. The second shearing device 604, the third shearing device 605 and the fourth shearing device 606 are used for shearing irregular head/tail parts of deformed rolled pieces or performing chopping treatment in the case of production failure; the fourth shearing device 606 also has a multiple length sectioning function, and is used for shearing a finished rolled piece and then cooling the rolled piece in the cooling bed 1001.
Further, in the multi-fire molding production system in this embodiment, a transition rack 701 and a down-line collecting device 702 are further provided between the shearing unit and the heat-insulating and heating unit, the transition rack 701 is used for conveying the continuous casting billets and steel ingots, and the down-line collecting device 702 is used for collecting and conveying the continuous casting billets and steel ingots.
Further, the multi-fire forming production system in the present embodiment further includes a descaling unit including a first descaling device 801 and a second descaling device 802, the first descaling device 801 being disposed between the first heating furnace 201 and the cogging mill 301, and the second descaling device 802 being disposed between the second heating furnace 501 and the second descaling device 802.
Further, the multi-fire forming production system in this embodiment further includes an online temperature control unit, where the online temperature control unit is configured to perform online temperature control on the blanks before and after finish rolling, and adjust the temperature of the rolled piece during and after the finish rolling forming process according to a preset rolling process temperature requirement. Specifically, the online temperature control unit comprises a first online temperature control water tank 901 and a second online temperature control water tank 902, the first online temperature control water tank 901 is arranged between the intermediate mill group 602 and the finishing mill group 603 and is located in front of the third shearing device 605, and the second online temperature control water tank 902 is arranged behind the finishing mill group 603 and is located in front of the fourth shearing device 606.
In another exemplary embodiment, the present application further provides a multi-fire forming process for high alloy materials, which is performed by using the system provided in the above embodiment, and the specific process flow is as follows:
1) there are two ways to heat the feedstock:
(1) the continuous casting billet enters a first heating furnace through a continuous casting billet feeding device and a roller way conveying line;
(2) the steel ingot is loaded into a steel ingot soaking pit through a crane.
2) After heating to the appointed tapping temperature, the continuous casting billets are put to a front roller way of a cogging mill through a heating furnace steel tapping mechanism, and steel ingots are hoisted to a steel ingot conveying line through a crane and are conveyed to the front of the cogging mill through the roller way. The sections of the steel ingot and the continuous casting slab are selected according to requirements, and generally 400 mm-1000 square or rectangular sections or phi 400 mm-phi 1500mm circular sections are selected.
3) The steel ingot and the continuous casting billet can adopt a descaling procedure or not through a descaling device according to the requirements of a process system.
4) And the steel ingot and the continuous casting billet are subjected to reciprocating type high reduction rolling through a cogging mill, and the steel ingot or the continuous casting billet with a large section is rolled into a blank section required in the middle. The shape selection of the cogging mill is matched with the section and the production capacity of the blank, the diameter of a roller generally selected is between phi 1000mm and phi 1800mm, and 1 frame or 2 frames can be considered in the number of the cogging mills.
5) The rolling temperature of the cogging mill is generally not lower than 1000 ℃ according to the temperature control of the rolling process. If the cogging pass is not finished, the specified middle section is not rolled, the temperature is lower than 1000 ℃, the specified middle section is cut to length through a first cutting device, the specified middle section returns to the first heating furnace through offline collection, a transition rack and a roller way conveying line for supplementary heating, and then the specified middle section is sent out through a furnace discharge mechanism of the first heating furnace and enters a cogging mill for secondary cogging. According to the requirements of production process system (reduction rule, rolling temp. and rolling speed), according to the section and temp. condition of blank material it can implement multiple heating/heat-supplementing (i.e. multi-fire) processes of cogging by means of said circulation.
6) After the intermediate blank section meeting the process setting requirement is rolled, the intermediate blank section is sized by the first shearing device and then sequentially enters the second heating furnace for heat preservation and heat supplement.
7) And (3) before the heat-insulated and heat-supplemented intermediate blank is conveyed to a roughing mill set through a second heating furnace steel tapping mechanism, whether surface descaling is carried out through a second descaling device is determined according to process requirements, and then the intermediate blank enters the roughing mill set for rolling, an intermediate mill set for rolling and a finishing mill set for rolling. 8) A second shearing device, a third shearing device and a fourth shearing device are respectively arranged behind the rough rolling unit, the middle rolling unit and the finishing rolling unit, and can shear the irregular head/tail parts of the deformed rolled pieces and also can perform chopping treatment when the production fails. The fourth shearing device also has a multiple length segmenting function and can shear a finished product rolled piece and then cool the rolled piece in a cooling bed.
9) The first online temperature control water tank and the second online temperature control water tank are arranged in front of and behind the finishing mill group, and the temperature of a finish rolling formed rolled piece and the temperature of the rolled piece can be adjusted according to the temperature requirement of the rolling process.
10) And (4) cooling the rolled finished product by a cooling bed, sizing at a sizing sawing and shearing device, and checking, bundling and collecting the finished product and warehousing the finished product in a system.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. A multi-fire forming process of high alloy materials is characterized by comprising the following steps:
(1) heating, cogging and rolling: heating the raw material continuous casting slab and/or steel ingot to a specified tapping temperature, then carrying out reciprocating multi-pass high-reduction rolling through a cogging mill, rolling the large-section continuous casting slab and/or the steel ingot into a middle-section blank with a specified section size, and controlling the temperature of the blank to be higher than the specified tapping temperature in the whole rolling process;
in the multi-pass cogging rolling process, when the temperature of the blank is lower than the specified tapping temperature but the intermediate section blank with the specified section size is not rolled, the blank is cut, sized and segmented, and then is subjected to supplementary heating, and then secondary cogging is performed, so that the heating/supplementary heating is performed for multiple times in a circulating manner until the intermediate section blank with the specified section size is rolled, and the multi-fire forming of cogging is completed;
(2) heat preservation and heat supplement: cutting the intermediate section blank with the specified section size into a fixed length and a section, and then carrying out heat preservation and heat supplement;
(3) and (3) continuous rolling and forming: and continuously rolling the intermediate section blank subjected to heat preservation and heat compensation to obtain a finished product with the final section size.
2. The multi-fire forming process of high alloy material according to claim 1, wherein: in the step (1), the specified tapping temperature is greater than or equal to 1000 ℃.
And/or in the step (1), carrying out reciprocating multi-pass rolling with not less than 3 passes to obtain an intermediate section blank with a specified section size.
3. The multi-fire forming process of high alloy material according to claim 1, wherein: in the step (1), descaling is carried out between the heating and cogging rolling processes;
and/or descaling after heat preservation and heat supplement and before continuous rolling.
4. The multi-fire forming process of high alloy material according to claim 1, wherein: in the step (1), in the cogging rolling process, the elongation coefficient of each deformation pass is set to be 1.1-2;
and/or in the step (3), in the forming process of continuous rolling, the elongation coefficient of each deformation pass is set to be 1.1-2.
5. The multi-fire forming process of high alloy material according to claim 1, wherein: in the step (3), the continuous rolling forming process comprises the working procedures of rough rolling, intermediate rolling and finish rolling.
6. The multi-fire forming process of high alloy material according to claim 5, wherein: in the step (3), a shearing process is respectively arranged after rough rolling, after intermediate rolling and after finish rolling, and the shearing process is used for shearing irregular head/tail parts of deformed rolled pieces, and/or is used for carrying out chopping treatment in case of production failure, and/or is used for carrying out multiple length segmentation;
and/or in the step (3), online temperature control is carried out before and after finish rolling, and the temperature of the rolled piece in the finish rolling forming process and after rolling is adjusted according to the preset temperature requirement of the rolling process.
7. The multi-fire forming process of high alloy material according to claim 1, wherein: the multi-fire forming process further comprises the step (4): and cooling the rolled finished product, sawing, shearing to length, checking, bundling, collecting and warehousing.
8. A many fires of high alloy material shaping production system which characterized in that: the multi-fire forming production system is applied to the multi-fire forming process of any one of claims 1 to 7, the multi-fire forming production system comprises a raw material feeding unit, a heating unit, a cogging rolling unit, a shearing unit, a heat preservation and heat supplement unit and a continuous rolling forming unit which are sequentially arranged along the forming direction, the raw material feeding unit is used for feeding raw material continuous casting billets and/or steel ingots into the heating unit for heating, the cogging rolling unit comprises a cogging mill, used for rolling the large-section continuous casting billet and/or steel ingot into an intermediate-section billet with a specified section size, the shearing unit is used for shearing the fixed-length sections, the heat-preservation and heat-supplement unit is used for preserving and heating the intermediate section blank, and the continuous rolling forming unit is used for continuously rolling and forming the heat-insulated and heat-supplemented intermediate section blank into a finished product with the final section size.
9. The multi-fire molding production system of claim 8, wherein: the raw material feeding unit comprises a continuous casting blank feeding device and a lifting device, the continuous casting blank feeding device is used for feeding a continuous casting blank into the heating unit, and the lifting device is used for feeding a steel ingot into the heating unit.
10. The multi-fire molding production system of claim 8, wherein: the multi-fire forming production system further comprises a descaling unit and/or an online temperature control unit, and/or the multi-fire forming production system further comprises a cooling bed, a fixed-length sawing and shearing device and an inspection bundling and collecting unit which are sequentially arranged along the forming direction.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210846135.4A CN115106375A (en) | 2022-07-04 | 2022-07-04 | Multi-fire forming process and production system for high-alloy material |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210846135.4A CN115106375A (en) | 2022-07-04 | 2022-07-04 | Multi-fire forming process and production system for high-alloy material |
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| CN202210846135.4A Pending CN115106375A (en) | 2022-07-04 | 2022-07-04 | Multi-fire forming process and production system for high-alloy material |
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