CN112170798A - Production line applied to continuous casting of bloom and forging and rolling method thereof - Google Patents
Production line applied to continuous casting of bloom and forging and rolling method thereof Download PDFInfo
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- CN112170798A CN112170798A CN202010887973.7A CN202010887973A CN112170798A CN 112170798 A CN112170798 A CN 112170798A CN 202010887973 A CN202010887973 A CN 202010887973A CN 112170798 A CN112170798 A CN 112170798A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/126—Accessories for subsequent treating or working cast stock in situ for cutting
Abstract
The invention belongs to the technical field of metal processing, and particularly relates to a production line applied to continuous casting of a bloom and a forging and rolling method thereof. The tundish, the continuous casting process, the heating process, the forging process, the shaping process and the cutting process are connected in sequence on the production line; the forging process includes a forging press, the forging press including: an upper anvil block and a lower anvil block which are symmetrically arranged in the vertical direction; the upper anvil block and the lower anvil block are three-section type anvil blocks, and the three-section type anvil blocks respectively comprise an inclination angle area, a central pressing area and a tail part leveling area. The continuous casting waste heat is fully utilized for hot processing, and the energy utilization rate and the core quality of the continuous casting bloom are improved.
Description
Technical Field
The invention belongs to the technical field of metal processing, and particularly relates to a production line applied to continuous casting of a bloom and a forging and rolling method thereof.
Background
The green steel process is an important subject of the current steel industry, and in the continuous casting production process, due to the characteristics of the metallurgical process, the continuous casting billet core inevitably has the defects of shrinkage cavity and shrinkage porosity, and the defects seriously affect the continuity of metal materials. This has a severe impact on both the fatigue and fracture resistance of the material and needs to be eliminated in a subsequent hot working process.
The conventional forging and rolling process needs heating before the forging and rolling processes, which results in a large amount of heat energy being wasted and is not in accordance with the concept of green process. How to fully utilize the waste heat of each production link is an important direction for the development of the future steel industry.
The forging method for improving the general looseness of the hollow parts forged by the continuous casting billets through small deformation has the advantages that the general looseness of the continuous casting billets is improved, meanwhile, the production efficiency is improved, the comprehensive production cost is reduced, and the product quality stability is high. But the requirement of energy conservation and emission reduction is difficult to meet in the repeated heating process. Also provides a forging method of the forging material with the diameter of 350-400mm, which has the advantages that 1-2 times of heating can be reduced compared with the current common forging technology, the production efficiency is greatly improved, and the resources are saved. The disadvantage is that the core quality of the casting blank is limited by adopting flat anvil forging.
Disclosure of Invention
Technical problem to be solved
Aiming at the existing technical problems, the invention provides a production line applied to continuous casting bloom and a forging and rolling method thereof, which solve the technical problems that the production line in the prior art is repeatedly heated and energy is wasted, the core part of the continuous casting bloom is poor in quality, and the product quality is low in stability.
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
in a first aspect, an embodiment of the present invention provides a production line for continuous casting of a bloom, including a tundish, a continuous casting process, a cutting process, a heating process, a forging process, and a shaping process;
the tundish, the continuous casting process, the heating process, the forging process, the shaping process and the cutting process are sequentially connected;
the forging process includes a forging press, the forging press including:
an upper anvil block and a lower anvil block which are symmetrically arranged in the vertical direction;
the upper anvil block and the lower anvil block are three-section type anvil blocks, and the three-section type anvil blocks respectively comprise an inclination angle area, a central pressing area and a tail part leveling area.
The production line applied to the continuous casting bloom provided by the embodiment of the invention solves the technical problems that the production line in the prior art is repeatedly heated, energy is wasted, the core part quality of the continuous casting bloom is poor, and the product quality stability is low.
Optionally, the inclined angle area is of a trapezoidal structure, and an inclined angle of the trapezoidal structure and the horizontal plane is an inclined angle of 0-60 degrees.
In a second aspect, an embodiment of the present invention provides a forging and rolling method applied to a continuous casting bloom, including the following steps:
101. continuous casting: molten steel sequentially passes through a tundish, a crystallizer, a water cooler and a tension straightener to obtain a continuous casting bloom;
102. heating: heating the continuous casting bloom through a heating coil to obtain a heated continuous casting bloom;
103. forging: forging the heated continuous casting bloom on a forging press by adopting an anvil block to obtain a forged continuous casting bloom;
104. modifying: modifying the forged continuous casting bloom through a vertical rolling mill to obtain a modified continuous casting bloom;
105. flame cutting: and performing flame cutting on the trimmed continuous casting bloom through a flame cutting machine to obtain a finished product continuous casting bloom.
The forging and rolling method applied to the continuous casting bloom provided by the embodiment of the invention utilizes the waste heat of each production link through reasonable process design, saves energy and greatly improves the production efficiency.
Optionally, in the forging process, the reduction speed of the forging press is matched with the continuous casting and blank drawing speed, and the following relation is satisfied:
wherein l is the length of the central pressing area of the anvil in mm, vcIn mm/s for continuous casting and drawing speed, y is the single pass displacement of the anvil in mm,
the average movement speed under anvil pressure, in mm/s,
the average moving speed of the anvil block is expressed in mm/s, deltah is the forging reduction in mm, and t is the deformation time of the continuous casting bloom in s.
Optionally, the production of the continuous casting bloom is adapted to the forging and profiling process, and the size of the continuous casting bloom after forging and profiling meets the target specification of the finished continuous casting bloom, and the following relationship is met:
c≥am1+Δz
d≥(b+Δx)2
wherein a is the length of the water outlet of the crystallizer and is in mm, b is the width of the water outlet of the crystallizer and is in mm, c is the target width of the finished continuous casting bloom and is in mm, d is the target height of the finished continuous casting bloom and is in mm, m1In order to obtain the forging reduction rate, deltaz is height springback caused by vertical roll modification, and the unit is mm, deltax is width variation of continuous casting bloom caused by forging, and the unit is mm,2the width ratio of the continuous casting bloom before and after the continuous casting bloom is shaped by a vertical rolling mill.
Optionally, during the forging process, the surface temperature of the continuous casting bloom is ensured to be within a set range, and the following relation is satisfied:
Tmin≤T0+tlimvt≤Tmax
in the formula, TminTo a predetermined minimum deformation temperature, T0Is the current temperature, vtFor continuous casting of billets at the rate of temperature change, t, under the action of heating coilslimFor continuous casting of billets in heating coilsMaximum heating time of (1), TmaxIs a preset maximum deformation temperature.
Optionally, during forging, the core surface temperature difference of the continuous casting bloom satisfies the following relationship:
Tcenter-Tsurface＞300
in the formula, TcenterFor continuous casting of the core temperature of the bloom in degrees Celsius, TsurfaceThe surface temperature of a continuous casting bloom is measured in units of ℃;
the corner temperature of the continuous casting bloom satisfies the following relation:
Tcorner≥Ar3+25
in the formula, TcornerThe corner temperature of the continuous casting bloom is measured in DEG Cr3The actual critical phase transition temperature of the steel during cooling is expressed in units of;
the surface temperature of the continuous casting bloom and the corner temperature of the continuous casting bloom satisfy the following relations:
Tsurface≤Tcorner+480。
(III) advantageous effects
The invention has the beneficial effects that: according to the production line applied to the continuous casting bloom and the forging and rolling method thereof, continuous casting waste heat is utilized at the tail end of continuous casting, and the continuous casting bloom is forged and cogging after temperature compensation, so that the problems that the conventional forging and rolling process is high in energy consumption and cannot fully eliminate internal shrinkage cavities and shrinkage porosity are solved, and the energy utilization rate and the core quality of the continuous casting bloom are improved.
Drawings
FIG. 1 is a flow chart of a production line for continuous casting of a bloom according to embodiment 1 of the present invention;
FIG. 2 is a schematic view of a production line for continuous casting of a bloom according to embodiment 1 of the present invention;
FIG. 3a is a front cross-sectional view of a forging press of the present invention;
FIG. 3b is a side view of the forging press of the present invention;
FIG. 3c is a top view of the forging press of the present invention;
FIG. 4a is a schematic overall view of an upper anvil according to the present invention;
FIG. 4b is a front view of the upper anvil of the present invention;
FIG. 4c is a side view of the upper anvil of the present invention;
FIG. 4d is a top view of the upper anvil of the present invention;
FIG. 5 is a flow chart of a forging and rolling method of a continuous casting billet according to embodiment 2 of the present invention.
[ description of reference ]
1: a tundish; 2: a crystallizer; 3: a water cooler; 4: a tension straightener; 5: a heating coil; 6: forging press; 7: a vertical rolling mill; 8: a flame cutter;
61: an upper anvil block; 62: an upper guide rail; 63: a first upper slider; 64: a second upper slide block; 65: an upper cam; 66: an upper transmission shaft;
61': a lower anvil block; 62': a lower guide rail; 63': a first lower slider; 64': a second lower slider; 65': a lower cam; 66': a lower transmission shaft;
a: a tilt angle region; b: a central pressing area; c: and a tail part leveling area.
Detailed Description
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings. Where directional terms such as "upper", "lower", etc. are used herein, reference is made to the orientation of FIG. 3 a.
According to the production line applied to the continuous casting bloom and the forging and rolling method thereof provided by the embodiment of the invention, the continuous casting waste heat is utilized at the tail end of continuous casting, and the continuous casting bloom is forged and cogging after temperature is supplemented, so that the production waste heat in the conventional continuous casting process is utilized, and the purpose of eliminating casting defects such as loose shrinkage cavities and the like in the continuous casting bloom is achieved.
In order to better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
Example 1
The production line applied to continuous casting of the bloom under high pressure is provided for the embodiment and is used for producing products with higher added values. The method comprises a tundish 1, a continuous casting process, a heating process, a forging process, a shaping process and a cutting process which are sequentially arranged. Wherein, the continuous casting process adopts a traditional arc continuous casting machine, and comprises a crystallizer 2, a water cooler 3 and a tension straightener 4. The heating process includes heating the coil 5. The forging process includes a forging press 6, and the finishing process includes a vertical rolling mill 7. The cutting process includes a torch cutter 8. Of course, it is conceivable to use a heating furnace instead of the heating coil.
Specifically, as shown in fig. 1, a flow chart of a production line applied to continuous casting of a bloom is provided for the present embodiment: the tundish 1, the crystallizer 2, the water cooler 3, the tension straightener 4, the heating coil 5, the forging press 6, the vertical rolling mill 7 and the flame cutting machine 8 are connected in sequence.
As shown in fig. 2, a schematic view of a production line applied to a continuous casting bloom is provided for the present embodiment.
Compared with the conventional production line (the tundish 1, the crystallizer 2, the water cooler 3, the tension straightener 4 and the flame cutting machine 8 are sequentially arranged) applied to the continuous casting bloom, the production line applied to the continuous casting bloom provided by the embodiment is additionally provided with the heating coil 5, the forging press 6 and the vertical rolling mill 7 between the tension straightener 4 and the flame cutting machine 8, the continuous casting bloom is heated from outside to inside by the heating coil 5, the heated continuous casting bloom is forged by the forging press 6, the core gap of a casting blank is pressed, and the side surface bulge of the continuous casting bloom caused by forging and pressing is trimmed by the vertical rolling mill 7 to be flat.
Preferably, a plurality of infrared temperature sensors for acquiring the surface temperature of the continuous casting billet are provided between the tension leveler 4 and the heating coil 5, and between the heating coil 5 and the forging press 6.
As shown in fig. 3a-3c, which are a front cross-sectional view, a side view, and a top view, respectively, of a forging press in this embodiment, the forging press includes a drive assembly a and a drive assembly B symmetrically disposed axially (i.e., vertically) toward one another, and an upper anvil 61 and a lower anvil 61' symmetrically disposed axially toward one another and disposed between the drive assembly a and the drive assembly B.
The driving assembly A comprises an upper guide rail 62, a first upper slide block 63, a second upper slide block 64, an upper cam 65 and an upper transmission shaft 66; the driving assembly B includes a lower guide rail 62 ', a first lower slider 63 ', a second lower slider 64 ', a lower cam 65 ', and a lower transmission shaft 66 '.
Further, the upper anvil 61 and the lower anvil 61' are symmetrically disposed and have the same structure, and the above anvil 61 is described as an example. Fig. 4a-4d show an overall schematic view, a front view, a side view and a top view, respectively, of an upper anvil according to this embodiment. The upper anvil block 61 is a three-stage anvil block including an inclined region a, a central pressing region b, and a tail-part flat region c, and can enhance the quality improvement effect of the continuous casting bloom core. The inclination angle area a is designed to be an unconventional flange inclined plane, the section of the inclination angle area a is of a trapezoidal structure, the inclined edge of the trapezoidal structure and the horizontal plane form an inclination angle theta, the value range of theta is 0-60 degrees, the inclination angle ensures the adaptation of continuous casting and blank drawing actions in the forging process, and the flange inclined plane design reduces the stress concentration at the edge. The central pressing area b comprises a flange design for enhancing the pressing effect on the shrinkage porosity of the central shrinkage cavity of the continuous casting bloom. The tail part leveling area c is a flat anvil and plays a role in leveling a continuous casting bloom. Preferably, the flange height does not exceed 20mm at the maximum, in order to avoid subsequent surface metal fold defects.
During forging, the upper anvil 61 and the lower anvil 61' are simultaneously pressed down to ensure that the center line of the continuous casting bloom is not shifted. The working principle of the forging press 6 is as follows: the upper transmission shaft 66 and the lower transmission shaft 66' are driven by the motor to rotate, and the upper cam 65 at the end of the upper transmission shaft 66 drives the second upper slide block 64 to move in the horizontal direction and the vertical direction. The second upper slider 64 drives the first upper slider 63 to move along the upper guide rail 62 in the vertical direction, so as to push the push rod, and drive the upper anvil block 61 to move up and down. Similarly, the lower cam 65 ' at the end of the lower transmission shaft 66 ' drives the second lower slider 64 ' to move horizontally and vertically. The second lower slider 64 'drives the first lower slider 63' to move along the lower guide rail 62 'in the vertical direction, so as to push the push rod, and drive the lower anvil block 61' to move up and down.
The forging press adopts the design of cam + guide rail, and the guide rail can alleviate the continuous casting bloom effectively and move the influence to forging press work in the horizontal direction, and the cam drives the slider and moves in the guide rail, and the slider connects the push rod, drives the motion of anvil block. The forging press realizes the simultaneous compression of the continuous casting bloom up and down through the transmission mechanism, and the influence of the forging process on the continuous casting bloom is reduced.
Because the driving assembly A and the upper anvil block 61, the driving assembly B and the lower anvil block 61' are symmetrically designed, the continuous casting bloom can be forged at the same pressing amount and the same pressing speed, the center line of the continuous casting bloom after forging does not deviate, and the influence of forging on a continuous casting bloom production line is reduced.
Furthermore, in order to realize no deviation of the central line of the continuously cast bloom after forging, the height of the supporting rollers needs to be adjusted, and a plurality of groups of liftable supporting roller bed systems are utilized to ensure that the continuously cast bloom after forging stably runs, so that the flexible switching of high reduction forging with different reduction amounts is realized.
Example 2
As shown in fig. 5, a flowchart of a forging and rolling method of a continuous casting bloom to which the production line of example 1 is applied includes the steps of:
101. continuous casting: molten steel sequentially passes through a tundish, a crystallizer, a water cooler and a tension straightener to obtain a continuous casting bloom;
the continuous casting bloom can be a rectangular billet, and the thickness of the continuous casting bloom can be 280-550 mm;
102. heating: heating the continuous casting bloom through a heating coil to obtain a heated continuous casting bloom;
103. forging: forging the heated continuous casting bloom on a forging press by adopting an anvil block to obtain a forged continuous casting bloom;
104. modifying: modifying the forged continuous casting bloom through a vertical rolling mill to obtain a modified continuous casting bloom;
105. flame cutting: and performing flame cutting on the trimmed continuous casting bloom through a flame cutting machine to obtain a finished product continuous casting bloom.
Further, in the forging process, the pressing speed of the forging press is matched with the continuous casting and blank drawing speed, and the following relations are satisfied:
wherein l is the length of the central pressing area of the anvil in mm, vcIn mm/s for continuous casting and drawing speed, y is the single pass displacement of the anvil in mm,
the average movement speed under anvil pressure, in mm/s,
the average moving speed of the anvil block is expressed in mm/s, deltah is the forging reduction in mm, and t is the deformation time of the continuous casting bloom in s.
Furthermore, in the forging process, the upper anvil block and the lower anvil block compress the continuous casting bloom simultaneously, so that the influence of the forging process on the continuous casting bloom is reduced. Wherein the moving instantaneous speed of the anvil satisfies the following relation:
v1＝ω(R1+d)cosα
in the formula, v1Is the instantaneous speed of the anvil movement, ω is the angular speed of the main shaft, R1Is the radius of the eccentric circle, d is the eccentric distance of the eccentric circle, and alpha is the rotation angle.
Further, in the forging process, the forging press needs to satisfy the deformation force required when the continuous casting bloom is deformed, and simultaneously, the energy condition is required to be satisfied. In order to prevent damage due to energy overload of the forging press, the motor connected to the forging press should satisfy the following energy accounting formula:
wherein W is the power of the motor and the unit is W, W1The deformation work of the continuous casting bloom is expressed by J and w2The stretching work is expressed in J, p is the working time of the motor, s and eta is the mechanical efficiency.
Further, in the shaping process, the shaping speed is matched with the continuous casting and blank drawing speed, and the following relation is met:
vr1＝vc
in the formula, vr1The modification speed of the vertical rolling mill is in mm/s.
Further, the production and forging and shaping processes of the continuous casting bloom are adaptive, the size of the continuous casting bloom after forging and shaping meets the target specification of the finished continuous casting bloom, and the following relations are met:
c≥am1+Δz
d≥(b+Δx)2
wherein a is the length of the water outlet of the crystallizer and is in mm, b is the width of the water outlet of the crystallizer and is in mm, c is the target width of the finished continuous casting bloom and is in mm, d is the target height of the finished continuous casting bloom and is in mm, m1In order to obtain the forging reduction rate, deltaz is height springback caused by vertical roll modification, and the unit is mm, deltax is width variation of continuous casting bloom caused by forging, and the unit is mm,2the width ratio of the continuous casting bloom before and after the continuous casting bloom is shaped by a vertical rolling mill.
Further, in the forging process, the surface temperature of the continuous casting bloom is ensured to be within a set range. The surface temperature of the continuous casting bloom is monitored in real time through an infrared temperature sensor, and a heating coil is controlled according to the surface temperature of the continuous casting bloom, so that the surface temperature of the continuous casting bloom is in a preset working interval. Normal pressure is carried out when the temperature is in a working interval; when the surface temperature of the continuous casting bloom is close to the preset maximum deformation temperature and is continuously increased, closing the heating coil in advance to avoid the temperature being higher than the preset maximum deformation temperature; when the surface temperature of the continuous casting bloom is continuously reduced, the heating coil is started in advance to avoid the temperature from being lower than the preset minimum deformation temperatureAnd (4) degree. When the heating coil is closed, the temperature of the continuous casting bloom is continuously higher than the preset maximum deformation temperature, or after the heating coil is opened, the temperature of the continuous casting bloom is continuously lower than the preset minimum deformation temperature and exceeds the preset limit time tlimWhen this happens, the forging press is stopped to protect the equipment. Wherein, the surface temperature of the continuous casting bloom is in a preset working interval, and the following relations are satisfied:
Tmin≤T0+tlimvt≤Tmax
in the formula, TminTo a predetermined minimum deformation temperature, T0Is the current temperature, vtFor continuous casting of billets at the rate of temperature change, t, under the action of heating coilslimFor the maximum heating time, T, of the continuous casting bloom in the heating coilmaxIs a preset maximum deformation temperature.
Further, in the forging process, the core-surface temperature difference of the continuous casting bloom is a main factor for implementing the process, and the core-surface temperature difference of the continuous casting bloom satisfies the following relation:
Tcenter-Tsurface＞300
in the formula, TcenterFor continuous casting of the core temperature of the bloom in degrees Celsius, TsurfaceThe surface temperature of a continuous casting bloom is measured in units of ℃;
the corner temperature of the continuous casting bloom satisfies the following relation:
Tcorner≥Ar3+25
in the formula, TcornerThe corner temperature of the continuous casting bloom is measured in DEG Cr3The actual critical phase transition temperature of the steel during cooling is expressed in units of;
the surface temperature of the continuous casting bloom and the corner temperature of the continuous casting bloom satisfy the following relations:
Tsurface≤Tcorner+480。
application example
By adopting the production line provided by the embodiment 1, the continuous casting production product is high value-added axle steel, and a process route of continuous casting, heating, forging and flame cutting is selected, so that a higher-quality product is obtained at a lower strain rate. Wherein the continuous casting and drawing speed is 12.5mm/s, and the section size of the continuous casting bloom is 360 multiplied by 400 mm. The length of a pressing area in the center of the anvil block is 50mm, the single-pass displacement is 800mm, the average moving speed of the anvil block is 500mm/s, the forging pressing working period is 2.4 s/time, the forging pressing rate is 20%, the power of a motor of a forging press is required to be not lower than 80kW, and the shaping speed of a vertical rod rolling mill is matched with the continuous casting and blank drawing speed and is 12.5 mm/s.
The size of the water outlet of the crystallizer is 400 multiplied by 360mm, the forging reduction is 80mm, and the size of the section of the continuous casting bloom is 440 multiplied by 323mm after the vertical roll modification.
The preset temperature range of the corner process of the continuous casting bloom is 800-950 ℃, and the temperature range of the central position of the upper surface and the side surface of the continuous casting bloom is 950-1100 ℃.
The infrared temperature sensor acquires and monitors the surface temperature of the continuous casting bloom in real time, and controls the heating coil to enable the temperature of the continuous casting bloom to be in a preset working interval. The initial temperature control limit time is 40s, and if the induction heating coil can not complete the temperature control of the key position of the continuous casting bloom in the time, the process protection equipment is stopped to be pressed down. The temperature control system realizes self-learning of the temperature change speed through a digital twin process according to the temperature data of the continuous casting bloom at different moments, so that the surface temperature of the continuous casting bloom is predicted, and the equipment process is stopped before the temperature exceeds a preset process temperature interval to protect equipment.
In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium; either as communication within the two elements or as an interactive relationship of the two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, a first feature may be "on" or "under" a second feature, and the first and second features may be in direct contact, or the first and second features may be in indirect contact via an intermediate. Also, a first feature "on," "above," and "over" a second feature may be directly or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lower level than the second feature.
In the description herein, the description of the terms "one embodiment," "some embodiments," "an embodiment," "an example," "a specific example" or "some examples" or the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it should be understood that the above embodiments are illustrative and not restrictive, and that those skilled in the art may make changes, modifications, substitutions and alterations to the above embodiments without departing from the scope of the present invention.
Claims (7)
1. A production line applied to continuous casting of bloom comprises a tundish, a continuous casting process and a cutting process, and is characterized by further comprising a heating process, a forging process and a shaping process;
the tundish, the continuous casting process, the heating process, the forging process, the shaping process and the cutting process are sequentially connected;
the forging process includes a forging press including:
an upper anvil block and a lower anvil block which are symmetrically arranged in the vertical direction;
the upper anvil block and the lower anvil block are three-section type anvil blocks, and the three-section type anvil blocks respectively comprise an inclination angle area, a central pressing area and a tail portion leveling area.
2. A production line for continuous casting of billets as claimed in claim 1, characterised in that,
the inclination angle area is of a trapezoidal structure, and an inclination angle of 0-60 degrees is formed between the inclined edge of the trapezoidal structure and the horizontal plane.
3. A forging and rolling method applied to a continuous casting bloom using the production line applied to a continuous casting bloom as set forth in claim 2, characterized by comprising the steps of:
101. continuous casting: molten steel sequentially passes through a tundish, a crystallizer, a water cooler and a tension straightener to obtain a continuous casting bloom;
102. heating: heating the continuous casting bloom through a heating coil to obtain a heated continuous casting bloom;
103. forging: forging the heated continuous casting bloom on a forging press by adopting an anvil block to obtain a forged continuous casting bloom;
104. modifying: modifying the forged continuous casting bloom through a vertical rolling mill to obtain a modified continuous casting bloom;
105. flame cutting: and performing flame cutting on the trimmed continuous casting bloom through a flame cutting machine to obtain a finished product continuous casting bloom.
4. The forging and rolling method applied to a continuous casting billet according to claim 3,
in the forging process, the pressing speed of the forging press is matched with the continuous casting and blank drawing speed, and the following relations are satisfied:
wherein l is the length of the central pressing area of the anvil in mm, vcIn mm/s for continuous casting and drawing speed, y is the single pass displacement of the anvil in mm,
the average movement speed under anvil pressure, in mm/s,
the average moving speed of the anvil block is expressed in mm/s, deltah is the forging reduction in mm, and t is the deformation time of the continuous casting bloom in s.
5. The forging and rolling method applied to a continuous casting billet according to claim 4,
the production and forging and shaping processes of the continuous casting bloom are adaptive, the size of the continuous casting bloom after forging and shaping meets the target specification of the finished product continuous casting bloom, and the following relations are met:
c≥am1+Δz
d≥(b+Δx)2
wherein a is the length of the water outlet of the crystallizer and is in mm, b is the width of the water outlet of the crystallizer and is in mm, c is the target width of the finished continuous casting bloom and is in mm, d is the target height of the finished continuous casting bloom and is in mm, m1In order to obtain the forging reduction rate,. DELTA.z is the height springback caused by the modification of the vertical rolls, and has a unit of mm, and. DELTA.x is the width of the continuously cast bloom caused by forgingThe degree change, in mm,2the width ratio of the continuous casting bloom before and after the continuous casting bloom is shaped by a vertical rolling mill.
6. The forging and rolling method applied to a continuous casting billet according to claim 5,
in the forging process, the surface temperature of the continuous casting bloom is ensured to be within a set range, and the following relation is satisfied:
Tmin≤T0+tlimvt≤Tmax
in the formula, TminTo a predetermined minimum deformation temperature, T0Is the current temperature, vtFor continuous casting of billets at the rate of temperature change, t, under the action of heating coilslimFor the maximum heating time, T, of the continuous casting bloom in the heating coilmaxIs a preset maximum deformation temperature.
7. The forging and rolling method applied to a continuous casting billet according to claim 6,
in the forging process, the temperature difference of the core surface of the continuous casting bloom satisfies the following relation:
Tcenter-Tsurface＞300
in the formula, TcenterFor continuous casting of the core temperature of the bloom in degrees Celsius, TsurfaceThe surface temperature of a continuous casting bloom is measured in units of ℃;
the corner temperature of the continuous casting bloom satisfies the following relation:
Tcorner≥Ar3+25
in the formula, TcornerThe corner temperature of the continuous casting bloom is measured in DEG Cr3The actual critical phase transition temperature of the steel during cooling is expressed in units of;
the surface temperature of the continuous casting bloom and the corner temperature of the continuous casting bloom satisfy the following relations:
Tsurface≤Tcorner+480。
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| CN115657759A (en) * | 2022-09-15 | 2023-01-31 | 华中光电技术研究所（中国船舶重工集团公司第七一七研究所） | Composite temperature control quartz flexible accelerometer structure |
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