CN113804482B - Method for rapidly detecting solidification end position of continuous casting billet - Google Patents
Method for rapidly detecting solidification end position of continuous casting billet Download PDFInfo
- Publication number
- CN113804482B CN113804482B CN202111080607.1A CN202111080607A CN113804482B CN 113804482 B CN113804482 B CN 113804482B CN 202111080607 A CN202111080607 A CN 202111080607A CN 113804482 B CN113804482 B CN 113804482B
- Authority
- CN
- China
- Prior art keywords
- continuous casting
- roller
- sample
- grade
- solidification end
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/04—Devices for withdrawing samples in the solid state, e.g. by cutting
-
- 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
- B22D11/16—Controlling or regulating processes or operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D2/00—Arrangement of indicating or measuring devices, e.g. for temperature or viscosity of the fused mass
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
-
- 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
- Y02P10/20—Recycling
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
The invention provides a method for rapidly detecting the solidification end position of a continuous casting blank, which is applied to the technical field of continuous casting blank production processes, and comprises the following detection steps: the roller (2) of the withdrawal and straightening machine (1) applies pressure in the inner and outer arc directions of the continuous casting billet; cutting and taking down the first pressed sample (3) respectively, and dissecting the first pressed sample (3); cutting a plurality of first pressing samples (3), turning and grinding the cut surfaces, and then placing the first pressing samples (3) into an acid pickling tank for soaking; the method for rapidly detecting the solidification end position of the continuous casting billet is characterized in that a certain pressure is applied to the continuous casting billet by using a withdrawal and straightening machine of a continuous casting machine, so that the solidification end position of the continuous casting billet can be rapidly and accurately judged, meanwhile, personnel are ensured not to need to be close to high-temperature molten steel/continuous casting billet in a short distance, additional investment and equipment transformation are not required to be increased, the operability is strong, the flow is simple, and the detection accuracy is high.
Description
Technical Field
The invention belongs to the technical field of continuous casting billet production processes, and particularly relates to a method for rapidly detecting the solidification tail end position of a continuous casting billet.
Background
The production process flow of the continuous casting machine comprises the steps of injecting molten steel into a tundish, distributing the molten steel into crystallizers of various flows by the tundish, quickly solidifying the molten steel through the crystallizers to form a solid blank shell, then entering a secondary cooling area of the continuous casting machine for continuous cooling, gradually thickening the solid blank shell, cutting after the liquid molten steel is completely solidified, and feeding into a stack for circulation to the next procedure. Where the liquid molten steel is about to solidify completely (or where the liquid molten steel is completely viscous) is called a solidification end position of the continuous casting slab. Generally, the position of the solidification end of the continuous casting blank is not only one of the main bases of the design of continuous casting equipment, the determination of continuous casting process parameters and other early design stages, but also one of the main parameters in the aspects of continuous casting production control, internal tissue structure of the casting blank, quality control of the casting blank and the like in the actual production process, so that the accurate detection of the position of the solidification end of the continuous casting blank has very important effects. At present, most of domestic steel plants adopt methods such as an online casting blank nail shooting method, an online pouring tracer method, a theoretical model measuring algorithm and the like to detect the solidification end of a continuous casting blank, and the defects of the former two methods are as follows: 1) The operation area of the operator is close to the high-temperature molten steel/continuous casting billet, so that the safety coefficient is low and the risk is high; 2) Most of the used raw materials (such as nail gun, steel nail and tracer) are national safety control articles, and are difficult to transport and purchase. The latter method has the disadvantages that: the method is more affected by external factors, and the accuracy of the result is poor. The problem of detecting the solidification end position of the continuous casting billet is not effectively solved.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: aiming at the defects of the prior art, the method for rapidly detecting the solidification end position of the continuous casting billet is provided, which has the advantages of ensuring that under the normal production condition of a continuous casting machine, a certain pressure is applied to the continuous casting billet by using a withdrawal and straightening machine of the continuous casting machine to deform the continuous casting billet, and then analyzing the continuous casting billet, so that the solidification end position of the continuous casting billet can be rapidly and accurately judged, meanwhile, the condition that personnel are not required to be close to high-temperature molten steel/continuous casting billet in a short distance, no additional investment or equipment transformation is required, the operability is strong, the process flow is simple, and the detection accuracy is high.
The technical scheme adopted by the invention is as follows:
the invention relates to a method for rapidly detecting the solidification end position of a continuous casting billet, which comprises the following detection steps:
s1, a withdrawal and straightening machine comprises a plurality of rollers, wherein the rollers of the withdrawal and straightening machine sequentially press down a continuous casting billet, and the rollers exert pressure in the inner arc direction and the outer arc direction of the continuous casting billet during pressing down;
s2, cutting the continuous casting billet pressed by each roller to remove a pressed sample I, and dissecting the pressed sample I in a manner that the pressed sample I is dissected on an intrados surface along the length direction;
s3, cutting a plurality of first pressed samples, turning and grinding the cut surfaces, and then placing the first turned and ground pressed samples in an acid pickling tank for soaking;
s4, taking out the pressed sample I after soaking, washing, drying, and taking an unpressed sample II as a comparison sample;
s5, comparing a first sample under different pressures formed by pressing different rollers with a second sample under no pressure respectively, and if the reduction of the internal center shrinkage cavity grade of the first sample under the pressure of a certain roller is found, the V-shaped segregation width is not obviously reduced, then proving that the solidification tail end of the continuous casting blank is behind the corresponding position of the roller; if the internal V-shaped segregation width of a pressed sample formed by pressing a certain roller is obviously reduced and the reduction of the central shrinkage cavity grade is not obvious, proving that the solidification end position is behind the corresponding position of the roller; based on the above changes, the solidification end position of the continuous casting slab on the continuous casting slab is estimated.
To ensure data accuracy, the above detection steps are repeated 1-2 times.
The rollers of the tension leveler comprise a 1# roller, a 2# roller, a 3# roller and a 4# roller, wherein the 1# roller, the 2# roller, the 3# roller and the 4# roller are arranged according to gaps.
When the continuous casting machine is in normal production, rolling down the No. 1 roller, lifting other rollers, lifting up after rolling down the No. 1 roller, and taking a sample I at the position for rolling down; after the sample is taken, rolling down the No. 2 roller, lifting other rollers, lifting up the roller after the No. 2 roller is rolled down, and taking the position to press down the sample I; after the sample is taken, rolling down the 3# roller, lifting other rollers, lifting up the 3# roller after the rolling down is finished, and taking the position to press down the sample I; after the sample is taken, the No. 4 roller is pressed down, other rollers are lifted up, the No. 4 roller is lifted up after the sample is pressed down, and the first sample is pressed down at the position.
When each roller of the withdrawal and straightening machine is pressed down, the continuous casting blank is circumferentially deformed, wherein the dimension deformation ratio (the ratio of the dimension of the casting blank after the pressing down to the dimension of the casting blank before the pressing down) in the inner and outer arc directions of the continuous casting blank is controlled to be 88-91%.
When the sample is placed in the pickling tank for soaking after the first dissection is completed, the solution in the pickling tank is hydrochloric acid with the concentration of 1:1, the temperature of the solution is 60-80 ℃, and the soaking time is more than 30 minutes.
After the method for rapidly detecting the solidification end position of the continuous casting billet is adopted for rolling, if a corresponding rolling sample after rolling of the No. 1 roller is split, and the central loosening grade is less than or equal to 1.0 grade after pickling, and the V-shaped segregation width is more than or equal to 50mm, the liquid core of the continuous casting billet is proved to be definitely behind the No. 1 roller; and continuing to adopt the No. 2 roller for pressing, if a corresponding pressing sample after the No. 2 roller is pressed is split, and the central loosening grade is less than or equal to 1.0 grade after pickling, the V-shaped segregation width is more than or equal to 50mm, proving that the liquid core of the continuous casting blank is still behind the No. 2 roller, and so on.
If the first cut-off of the pressed sample corresponding to the rolling of the No. 1 roller shows a state that the central loosening grade is less than or equal to 1.0 grade and the V-shaped segregation width is more than or equal to 50mm after pickling, and the second cut-off of the pressed sample corresponding to the rolling of the No. 2 roller shows a state that the central shrinkage cavity grade is more than 1 grade and the V-shaped segregation width is less than 50mm after pickling, the solidification tail end of the continuous casting billet is proved to be between the No. 1 roller and the No. 2 roller; if the first cut-off of the corresponding pressed sample under the condition that the central loosening grade is less than or equal to 1.0 grade and the V-shaped segregation width is more than or equal to 50mm is presented after the acid washing, the 3# roller performs the first cut-off of the corresponding pressed sample under the condition that the central shrinkage cavity grade is more than 1 grade and the V-shaped segregation width is less than 50mm, the solidification end of the continuous casting billet is proved to be between the 2# roller and the 3# roller, and the like.
If the first cut-open and acid-washed rolled-down sample formed by rolling down the No. 1 roller shows a state that the central shrinkage cavity grade is more than 1 grade and the V-shaped segregation width is less than 50mm, the situation proves that the solidification end of the continuous casting blank is in front of the No. 1 roller, the position of the solidification end cannot be accurately judged, and for the situation, the technological parameters of the continuous casting machine, such as improving the casting speed of the continuous casting machine or reducing the cooling strength of the continuous casting blank, prolonging the position of the solidification end of the casting blank, and re-detecting according to the steps after extension.
If the first cut-open and acid-washed rolled-down sample formed by rolling down the No. 4 roller shows a state that the central shrinkage grade is more than 1 grade and the V-shaped segregation width is less than 50mm, the condition proves that the solidification end of the continuous casting blank is behind the No. 4 roller, the position of the solidification end cannot be accurately judged, and for the condition, the technological parameters of a continuous casting machine are adjusted, such as reducing the continuous casting speed or enhancing the cooling strength of the continuous casting blank, shortening the position of the solidification end of the casting blank, and re-detecting according to the steps after shortening.
By adopting the technical scheme of the invention, the following beneficial effects can be obtained:
the method for rapidly detecting the solidification end position of the continuous casting billet provided by the invention provides a brand new technical scheme based on an ingenious conception aiming at the defects in the prior art. The detection method of the invention is continuous in a conventional production mode (without additional investment), and provides a brand new method for detecting the solidification tail end position of the casting blank, namely, under the normal production condition of a continuous casting machine, a certain pressure is applied to the square/rectangular continuous casting blank by using a withdrawal and straightening machine device of the continuous casting machine, so that the continuous casting blank is deformed. And then analyzing the continuous casting blank so as to judge the solidification end position of the continuous casting blank. The advantages are that: 1) Personnel do not need to approach the high-temperature molten steel/continuous casting blank in a short distance; 2) No additional investment and equipment transformation are required; 3) The operability is strong, the process flow is simple, and the detection accuracy is higher. The method provided by the invention has the advantages that under normal production conditions of the continuous casting machine, the existing withdrawal and straightening machine device is utilized to judge the solidification end of the casting blank, the method has the advantages that no additional investment or equipment transformation is required, personnel do not need to approach the high-temperature molten steel/the continuous casting blank in a short distance, the operability is strong, the process flow is simple, the detection accuracy is higher, and the like, and the defects of the traditional continuous casting blank solidification end detection technology are effectively overcome.
Drawings
The following is a brief description of what is expressed in the drawings of this specification and the references in the drawings:
FIG. 1 is a schematic diagram of a withdrawal and straightening machine according to the present invention;
FIG. 2 is a schematic diagram of a pressed sample of the tension leveler according to the present invention;
FIG. 3 is a schematic view showing the structure of the withdrawal and straightening machine according to the present invention when a pressed sample is cut (longitudinally cut);
FIG. 4 is a schematic diagram of an undepressed sample of the tension leveler according to the present invention;
the reference numerals in the figures are respectively: 1. a withdrawal and straightening machine; 2. a roller; 3. pressing down the sample; 4. the sample was not depressed; 5. a 1# roller; 6. a 2# roller; 7. a 3# roller; 8. and a 4# roller.
Detailed Description
The following describes the shape, structure, mutual position and connection relation between parts, action of parts and working principle of the specific embodiment of the present invention by describing examples in further detail:
as shown in fig. 1-4, the invention provides a method for rapidly detecting the solidification end position of a continuous casting billet, which comprises the following detection steps: s1, a withdrawal and straightening machine 1 comprises a plurality of rollers 2, wherein the rollers 2 of the withdrawal and straightening machine 1 sequentially press down a continuous casting billet, and the rollers 2 apply pressure in the inner arc direction and the outer arc direction of the continuous casting billet during pressing down; s2, cutting and taking down a first pressed sample 3 from the continuous casting billet pressed by each roller 2, and dissecting the first pressed sample 3 in a way that the intrados of the first pressed sample 3 is dissected along the length direction; s3, cutting the first plurality of pressed samples, turning and grinding the cut surface, and then placing the first turned and ground pressed sample 3 into an acid pickling tank for soaking; s4, taking out the pressed sample I after soaking, washing, drying, and taking an unpressed sample II as a comparison sample; s5, comparing different rolling samples I3 formed by rolling different rollers 2 with non-rolling samples II 4 respectively, and if the reduction of the level of central shrinkage cavity in the rolling sample I3 formed by rolling a certain roller 2 of the rolling sample I3 is found, the reduction of V-shaped segregation width is not obvious, then proving that the solidification tail end of the continuous casting blank is behind the corresponding position of the roller 2; if the V-shaped segregation width in the first 3 of the pressing sample formed by pressing a certain roller 2 is obviously reduced and the reduction of the central shrinkage cavity grade is not obvious, proving that the solidification end position is behind the corresponding position of the roller 2; based on the above changes, the solidification end position of the continuous casting slab on the continuous casting slab is estimated. To ensure data accuracy, the above detection steps are repeated 1-2 times. The steps are based on ingenious conception and provide a brand new technical scheme aiming at the defects in the prior art. The detection method of the invention is continuous in a conventional production mode (without additional investment), and provides a brand new method for detecting the solidification tail end position of the casting blank, namely, under the normal production condition of a continuous casting machine, a certain pressure is applied to the square/rectangular continuous casting blank by using a withdrawal and straightening machine device of the continuous casting machine, so that the continuous casting blank is deformed. And then analyzing the continuous casting blank so as to judge the solidification end position of the continuous casting blank. The advantages are that: 1) Personnel do not need to approach the high-temperature molten steel/continuous casting blank in a short distance; 2) No additional investment and equipment transformation are required; 3) The operability is strong, the process flow is simple, and the detection accuracy is higher. The method provided by the invention has the advantages that under normal production conditions of the continuous casting machine, the existing withdrawal and straightening machine device is utilized to judge the solidification end of the casting blank, the method has the advantages that no additional investment or equipment transformation is required, personnel do not need to approach the high-temperature molten steel/the continuous casting blank in a short distance, the operability is strong, the process flow is simple, the detection accuracy is higher, and the like, and the defects of the traditional continuous casting blank solidification end detection technology are effectively overcome.
The roller 2 of the tension leveler 1 comprises a 1# roller 5, a 2# roller 6, a 3# roller 7, a 4# roller 8, and the 1# roller 5, the 2# roller 6, the 3# roller 7 and the 4# roller 8 are arranged in a clearance. In the above steps, the withdrawal and straightening machine used includes a plurality of rolls, and in the present invention, four rolls are preferably provided, namely, a 1# roll 5, a 2# roll 6, a 3# roll 7, and a 4# roll 8. The number of rolls of the withdrawal and straightening machine may be increased or decreased, as desired.
When the continuous casting machine is in normal production, the No. 1 roller 5 is pressed down, other rollers 2 are lifted up, the No. 1 roller 5 is lifted up after the pressing down is finished, and a sample No. 3 is pressed down at the position; after the sample is taken out, the No. 2 roller 6 is pressed down, other rollers 2 are lifted up, the No. 2 roller 6 is lifted up after the sample is pressed down, and the first sample 3 is taken out from the position; after the sample is taken out, the 3# roller 7 is pressed down, other rollers 2 are lifted up, the 3# roller 7 is lifted up after the pressing down is finished, and the sample I3 is taken out from the position; after the sample is taken out, the 4# roller 8 is pressed down, the other rollers 2 are lifted up, the 4# roller 8 is lifted up after the sample is pressed down, and the sample one 3 is pressed down at the position. In the continuous casting billet production process, each roller is pressed down in sequence to form a pressed sample at different positions of the continuous casting billet, and then the pressed sample is taken down.
When each roller 2 of the withdrawal and straightening machine 1 is pressed down, the continuous casting blank is deformed circumferentially, wherein the dimension deformation ratio (the ratio of the dimension of the casting blank after the pressing down to the dimension of the casting blank before the pressing down) in the inner and outer arc directions of the continuous casting blank is controlled to be 88-91%. The deformation ratio can be appropriately adjusted according to the actual situation.
When the sample one 3 is pressed down and soaked in a pickling tank after dissection is finished, the solution in the pickling tank is hydrochloric acid with the concentration of 1:1, the temperature of the solution is 60-80 ℃, and the soaking time is more than 30 minutes. Cutting and sampling the pressed continuous casting blank, controlling the sampling length to be 800-1000mm, and delivering the sample to a machining center for dissection. Meanwhile, a sample of the unreeled casting blank is required to be taken as a comparison sample, and the concrete processing mode of the unreeled sample is implemented by pressing the sample of the unreeled casting blank.
After the method for rapidly detecting the solidification end position of the continuous casting billet is adopted for pressing, if a corresponding pressing sample I3 after the 1# roller 5 is pressed is split and is in a state that the central loosening grade is less than or equal to 1.0 grade and the V-shaped segregation width is more than or equal to 50mm after pickling, the liquid core of the continuous casting billet is proved to be definitely behind the 1# roller 5; and continuing to adopt the No. 2 roller 6 for pressing, if the corresponding pressing sample No. 3 after the No. 2 roller 6 is pressed is split, the central loosening grade is less than or equal to 1.0 grade after pickling, the V-shaped segregation width is more than or equal to 50mm, proving that the liquid core of the continuous casting blank is still behind the No. 2 roller 6, and the like.
If the corresponding depressed sample I3 under the condition that the central loosening grade is less than or equal to 1.0 grade after the 1# roller 5 is depressed and the V-shaped segregation width is more than or equal to 50mm is displayed after the pickling, and the corresponding depressed sample I3 under the condition that the central shrinkage cavity grade is more than 1 grade and the V-shaped segregation width is less than 50mm is displayed after the 2# roller 6 is depressed and the pickling, the solidification end of the continuous casting billet is proved to be between the 1# roller 5 and the 2# roller 6; if the corresponding depressed sample one 3 under 2#6 is split and washed with acid, the central loosening grade is less than or equal to 1.0 grade, the V-shaped segregation width is more than or equal to 50mm, the 3# roller 7 is split and washed with acid, the corresponding depressed sample one 3 under 2#6 is more than 1 grade, the V-shaped segregation width is less than 50mm, the solidification end of the continuous casting billet is proved to be between the 2# roller 6 and the 3# roller 7, and the like.
If the first 3 sections of the pressed sample formed by pressing the No. 1 roller 5 show a state that the central shrinkage cavity grade is more than 1 grade and the V-shaped segregation width is less than 50mm after pickling, the situation proves that the solidification end of the continuous casting blank is in front of the No. 1 roller 5, the position of the solidification end cannot be accurately judged, and in the situation, the continuous casting process parameters are adjusted, such as the casting speed of a continuous casting machine is improved or the cooling intensity of the continuous casting blank is reduced, the position of the solidification end of the casting blank is prolonged, and the detection is carried out again according to the steps after the extension.
If the first 3 sections of the pressed sample formed by pressing the 4# roller 8 are cut, and the state that the center shrinkage grade is more than 1 grade and the V-shaped segregation width is less than 50mm is presented after pickling, the situation proves that the solidification end of the continuous casting blank is behind the 4# roller 8, the position of the solidification end cannot be accurately judged, and in the situation, the technological parameters of the continuous casting machine are adjusted, such as reducing the continuous casting speed or enhancing the cooling strength of the continuous casting blank, shortening the position of the solidification end of the casting blank, and detecting again according to the steps after shortening.
Based on a specific embodiment, the detection method disclosed by the invention mainly comprises three steps:
step one: and adopting a withdrawal and straightening machine to sequentially roll the continuous casting blank, as shown in fig. 1, wherein a specific rolling process is required to be designed by each manufacturer according to the self condition, but the deformation ratio of the rolled casting blank is required to meet the requirement. Under the production condition of a continuous casting machine, adopting a withdrawal and straightening machine device to press a continuous casting billet of a steel grade to be detected (applying pressure in the inner arc direction and the outer arc direction of the continuous casting billet), namely, pressing a No. 1 roller, lifting other rollers, lifting the rollers after the No. 1 roller is pressed, and taking a pressed sample; after the sample is taken, rolling the 2# roller, lifting other rollers, lifting the 2# roller after the rolling, and taking the sample under pressure; rolling the 3# roll after the sample is taken, and analogizing to deform the continuous casting blank circumferentially, wherein the dimensional deformation ratio (the ratio of the size of the casting blank after the rolling to the size of the casting blank before the rolling) of the internal and external arc directions of the casting blank is generally controlled to be 88-91% (the deformation ratio can be properly adjusted according to actual conditions);
step two: cutting and sampling the pressed continuous casting blank, wherein the sampling length is generally controlled to be 800-1000mm, and the sample is sent to a machining center for dissection, as shown in fig. 2, wherein the dissection mode is as follows: the inner cambered surface of the continuous casting billet is equally split along the length direction, as shown in figure 3, and the split surface is turned and ground flat after the split. After dissection, placing the pressed sample into a pickling tank for soaking, wherein the solution in the pickling tank is hydrochloric acid with the concentration of 1:1, the temperature of the solution is 60-80 ℃, and the soaking time is 30min. And after the soaking is finished, taking out the pressed sample, washing and drying. Meanwhile, 1 sample of the blank which is not pressed is taken as a comparison sample, and the processing mode is implemented by pressing the sample of the blank.
Step three: comparing the depressed samples (depressed cast blank samples) at different positions with the non-depressed samples (non-depressed cast blank samples), and if the central shrinkage cavity grade in the casting blank corresponding to the depression of a certain withdrawal and straightening machine is obviously reduced, the V-shaped segregation width is not obviously reduced, then proving that the solidification tail end of the casting blank is behind the withdrawal and straightening machine. If the V-shaped width in the casting blank corresponding to the reduction of a certain withdrawal and straightening machine is found to be obviously reduced, the central shrinkage cavity grade is not obviously reduced, and the solidification end position is proved to be in front of the withdrawal and straightening machine. Based on the above change, the position of the solidification end of the cast slab can be estimated. In order to ensure the accuracy of the data, the detection steps are repeated for 1-2 times, so that multiple times of correction are realized.
Case 1: the reduction is carried out by adopting the steps, and if the corresponding casting blank sample after the reduction of the No. 1 roller is longitudinally sectioned and pickled and then is in a state that the central shrinkage cavity grade is more than 1 grade and the V-shaped segregation width is less than 50mm, the casting blank liquid core is proved to be definitely behind the No. 1 roller. And continuing to adopt the No. 2 roller for pressing, and if the corresponding casting blank sample after the No. 2 roller is pressed still presents a state that the central shrinkage cavity grade is more than 1 grade and the V-shaped segregation width is less than 50mm after the longitudinal sectioning acid washing, proving that the casting blank liquid core is still behind the No. 2 roller. Continuing to adopt the 3# roller for pressing, if the corresponding casting blank sample after the 3# roller is pressed still presents a state that the central shrinkage cavity grade is more than 1 grade and the V-shaped segregation width is less than 50mm after the longitudinal sectioning and acid washing, proving that the casting blank liquid core is still behind the 3# roller, and then analogizing;
however, if the corresponding casting blank sample is longitudinally sectioned and pickled by the No. 1 roller and then is in a state that the central shrinkage cavity grade is more than 1 grade and the V-shaped segregation width is less than 50mm, and the corresponding casting blank sample is longitudinally sectioned and pickled by the No. 2 roller, the corresponding casting blank sample is longitudinally sectioned and pickled by the No. 2 roller and then is in a state that the central shrinkage cavity grade is 1.5 grade and the V-shaped segregation width is 35mm, the solidification end of the casting blank is proved to be between the No. 1 roller and the No. 2 roller. If the corresponding casting blank sample after being longitudinally sectioned and pickled by the No. 2 roller shows a state that the central shrinkage grade is more than 1 grade and the V-shaped segregation width is less than 50mm, and the corresponding casting blank sample after being longitudinally sectioned and pickled by the No. 3 roller shows a state that the central shrinkage grade is more than 1 grade and the V-shaped segregation width is less than 50mm, the casting blank solidification end is proved to be between the No. 2 roller and the No. 3 roller, and so on.
Case 2: by adopting the steps for pressing, if the corresponding casting blank sample after the 1# roller is pressed is longitudinally sectioned and pickled to be in a state that the central shrinkage grade is more than 1 grade and the V-shaped segregation width is less than 50mm, the condition that the solidification end of the casting blank is in front of the 1# roller is proved, and the position of the solidification end cannot be accurately judged. For this case, it is necessary to adjust process parameters of the continuous casting machine, such as increasing the casting speed of the continuous casting machine or decreasing the cooling strength of the continuous casting slab, and to lengthen the position of the solidification end of the casting slab. And (5) detecting after extension.
Case 3: by adopting the steps for pressing, if the corresponding casting blank sample after the 4# roller is pressed is longitudinally sectioned and pickled to be in a state that the central shrinkage grade is more than 1 grade and the V-shaped segregation width is less than 50mm, the condition that the solidification end of the casting blank is behind the 4# roller is proved, and the position of the solidification end cannot be accurately judged. For this case, it is necessary to adjust the technological parameters of the continuous casting machine, such as reducing the casting speed of continuous casting or enhancing the cooling strength of the continuous casting slab, shortening the position of the solidification end of the casting slab. Shortening and then detecting.
The method for rapidly detecting the solidification end position of the continuous casting billet provided by the invention provides a brand new technical scheme based on an ingenious conception aiming at the defects in the prior art. The detection method of the invention provides a brand new method for detecting the solidification tail end position of the casting blank in a conventional production mode (without additional investment), namely, under the normal production condition of a continuous casting machine, a certain pressure is applied to the square/rectangular continuous casting blank by using a withdrawal and straightening machine device of the continuous casting machine, so that the continuous casting blank is deformed. And then analyzing the continuous casting blank so as to judge the solidification end position of the continuous casting blank. The advantages are that: 1) Personnel do not need to approach the high-temperature molten steel/continuous casting blank in a short distance; 2) No additional investment and equipment transformation are required; 3) The operability is strong, the process flow is simple, and the detection accuracy is higher. The method provided by the invention has the advantages that under normal production conditions of the continuous casting machine, the existing withdrawal and straightening machine device is utilized to judge the solidification end of the casting blank, the method has the advantages that no additional investment or equipment transformation is required, personnel do not need to approach the high-temperature molten steel/the continuous casting blank in a short distance, the operability is strong, the process flow is simple, the detection accuracy is higher, and the like, and the defects of the traditional continuous casting blank solidification end detection technology are effectively overcome.
While the invention has been described above with reference to the accompanying drawings, it will be apparent that the specific implementation of the invention is not limited by the foregoing, but rather is within the scope of the invention as long as various modifications are made by the method concept and technical scheme of the invention, or the concept and technical scheme of the invention are directly applied to other occasions without modification.
Claims (10)
1. A method for rapidly detecting the solidification end position of a continuous casting billet is characterized in that: the method for rapidly detecting the solidification end position of the continuous casting billet comprises the following detection steps:
s1, a withdrawal and straightening machine (1) comprises a plurality of rollers (2), the rollers (2) of the withdrawal and straightening machine (1) sequentially press down a continuous casting billet, and the rollers (2) apply pressure in the inner arc direction and the outer arc direction of the continuous casting billet during pressing down;
s2, cutting and taking down a first pressed sample (3) from the continuous casting billet pressed by each roller (2), and dissecting the first pressed sample (3) in a way that the first pressed sample (3) is dissected on an intrados along the length direction;
s3, cutting the first pressing samples (3), turning and grinding the cut surfaces, and then placing the first pressing samples (3) subjected to turning and grinding in an acid pickling tank for soaking;
s4, taking out the immersed sample I (3), washing, drying, and taking a sample II (4) which is not depressed as a comparison sample;
s5, respectively comparing different pressed samples (3) formed by pressing different rollers (2) with non-pressed samples (4), and if the reduction of the central shrinkage cavity level in the pressed samples (3) formed by pressing a certain roller (2) of the pressed samples (3) is found, proving that the solidification tail end of the continuous casting blank is behind the corresponding position of the roller (2) if the V-shaped segregation width is not obviously reduced; if the V-shaped segregation width in the first pressed sample (3) formed by pressing a certain roller (2) is obviously reduced and the reduction of the central shrinkage cavity grade is not obvious, proving that the solidification end position is behind the corresponding position of the roller (2); based on the above changes, the solidification end position of the continuous casting slab on the continuous casting slab is estimated.
2. The method for rapidly detecting the solidification end position of a continuous casting slab according to claim 1, wherein: to ensure data accuracy, the above detection steps are repeated 1-2 times.
3. The method for rapidly detecting the solidification end position of a continuous casting slab according to claim 1 or 2, characterized in that: the roller (2) of the tension leveler (1) comprises a 1# roller (5), a 2# roller (6), a 3# roller (7) and a 4# roller (8), wherein the 1# roller (5), the 2# roller (6), the 3# roller (7) and the 4# roller (8) are arranged according to gaps.
4. A method for rapidly detecting a solidification end position of a continuous casting according to claim 3, wherein: when the continuous casting machine is in normal production, the No. 1 roller (5) is pressed down, other rollers (2) are lifted up, the No. 1 roller (5) is lifted up after the pressing down is finished, and a first pressing-down sample (3) at the position is taken; after the sample is taken out, the No. 2 roller (6) is pressed down, other rollers (2) are lifted, after the No. 2 roller (6) is pressed down, the first sample (3) is taken out from the position; after the sample is taken out, the 3# roller (7) is pressed down, other rollers (2) are lifted, after the 3# roller (7) is pressed down, the 3# roller is lifted up, and the first sample (3) is taken out from the position; after the sample is taken out, the 4# roller (8) is pressed down, the other rollers (2) are lifted up, the 4# roller (8) is lifted up after the pressing down is finished, and the sample one (3) is taken out from the position.
5. The method for rapidly detecting a solidification end position of a continuous casting according to claim 4, wherein: when each roller (2) of the withdrawal and straightening machine (1) is pressed down, the continuous casting blank is circumferentially deformed, wherein the dimension deformation ratio of the continuous casting blank in the inner and outer arc directions is controlled to be 88% -91%.
6. The method for rapidly detecting the solidification end position of a continuous casting slab according to claim 1 or 2, characterized in that: when the sample one (3) is pressed down and soaked in a pickling tank after dissection is finished, the solution in the pickling tank is hydrochloric acid with the concentration of 1:1, the temperature of the solution is 60-80 ℃, and the soaking time is more than 30 minutes.
7. The method for rapidly detecting a solidification end position of a continuous casting according to claim 4, wherein: after the method for rapidly detecting the solidification end position of the continuous casting billet is adopted for rolling down, if a corresponding rolling sample I (3) after the rolling down of the No. 1 roller (5) is split and the center loose grade is less than or equal to 1.0 grade after pickling, and the V-shaped segregation width is more than or equal to 50mm, the condition that the liquid core of the continuous casting billet is definitely behind the No. 1 roller (5) is proved; and continuing to adopt the No. 2 roller (6) for pressing, if the corresponding pressing sample I (3) after the No. 2 roller (6) is pressed is split and is in a state that the central loosening grade is less than or equal to 1.0 grade and the V-shaped segregation width is more than or equal to 50mm after pickling, proving that the continuous casting blank liquid core is still behind the No. 2 roller (6), and then analogizing.
8. The method for rapidly detecting a solidification end position of a continuous casting according to claim 4, wherein: if the first (3) of the corresponding pressing sample pressed by the No. 1 roller (5) is split, the center loosening grade is less than or equal to 1.0 grade and the V-shaped segregation width is more than or equal to 50mm after pickling, and the first (3) of the corresponding pressing sample pressed by the No. 2 roller (6) is split, the center shrinkage grade is more than 1 grade and the V-shaped segregation width is less than 50mm after pickling, the solidification tail end of the continuous casting billet is proved to be between the No. 1 roller (5) and the No. 2 roller (6); if the corresponding depressed sample I (3) under the 2# rolling (6) is cut, the center loose grade is less than or equal to 1.0 grade after pickling, the V-shaped segregation width is more than or equal to 50mm, the corresponding depressed sample I (3) under the 3# rolling (7) is cut, the center shrinkage cavity grade is more than 1 grade after pickling, the V-shaped segregation width is less than 50mm, the solidification end of the continuous casting blank is proved to be between the 2# rolling (6) and the 3# rolling (7), and the like.
9. The method for rapidly detecting a solidification end position of a continuous casting according to claim 4, wherein: if a first pressed sample (3) formed by pressing a No. 1 roller (5) is split, and after pickling, the state that the central shrinkage grade is more than 1 grade and the V-shaped segregation width is less than 50mm is presented, the condition that the solidification end of a continuous casting blank is in front of the No. 1 roller (5) is proved to be unable to accurately judge the position of the solidification end, and in the condition, the technological parameters of a continuous casting machine are adjusted, the casting speed of the continuous casting machine is improved or the cooling strength of the continuous casting blank is reduced, the position of the solidification end of the casting blank is prolonged, and the continuous casting blank is re-detected according to the steps.
10. The method for rapidly detecting a solidification end position of a continuous casting according to claim 4, wherein: if a first rolling sample (3) formed by rolling a No. 4 roller (8) is cut, and is subjected to acid washing, and then the rolling sample is in a state that the central shrinkage grade is more than 1 grade and the V-shaped segregation width is less than 50mm, the condition that the solidification end of a continuous casting blank is behind the No. 4 roller (8) is proved to be unable to accurately judge the position of the solidification end, and in the condition, the technological parameters of a continuous casting machine are adjusted, the continuous casting speed is reduced or the cooling intensity of a continuous casting blank is enhanced, the position of the solidification end of the casting blank is shortened, and the continuous casting blank is re-detected according to the steps after the shortening.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111080607.1A CN113804482B (en) | 2021-09-15 | 2021-09-15 | Method for rapidly detecting solidification end position of continuous casting billet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111080607.1A CN113804482B (en) | 2021-09-15 | 2021-09-15 | Method for rapidly detecting solidification end position of continuous casting billet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113804482A CN113804482A (en) | 2021-12-17 |
| CN113804482B true CN113804482B (en) | 2023-07-25 |
Family
ID=78941103
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111080607.1A Active CN113804482B (en) | 2021-09-15 | 2021-09-15 | Method for rapidly detecting solidification end position of continuous casting billet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113804482B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116242651B (en) * | 2023-05-11 | 2023-07-18 | 常州润来科技有限公司 | Copper pipe blank sampling method and device for horizontal continuous casting process |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101920323A (en) * | 2010-08-02 | 2010-12-22 | 河北钢铁股份有限公司邯郸分公司 | Dynamic soft reduction method for detecting tail end of solidified liquid core of casting blank based on pressure feedback |
| CN104493121A (en) * | 2014-11-28 | 2015-04-08 | 东北大学 | Online detection method for solidified bottom end position in bloom continuous casting production process |
| CN107363230A (en) * | 2017-07-31 | 2017-11-21 | 中冶赛迪工程技术股份有限公司 | A kind of method of on-line checking continuous casting billet liquid phase fraction and solidification end |
| CN112784367A (en) * | 2020-12-10 | 2021-05-11 | 江阴兴澄特种钢铁有限公司 | Method for calculating thickness of blank shell at position of continuous casting roller row and solidification tail end of casting machine |
-
2021
- 2021-09-15 CN CN202111080607.1A patent/CN113804482B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101920323A (en) * | 2010-08-02 | 2010-12-22 | 河北钢铁股份有限公司邯郸分公司 | Dynamic soft reduction method for detecting tail end of solidified liquid core of casting blank based on pressure feedback |
| CN104493121A (en) * | 2014-11-28 | 2015-04-08 | 东北大学 | Online detection method for solidified bottom end position in bloom continuous casting production process |
| CN107363230A (en) * | 2017-07-31 | 2017-11-21 | 中冶赛迪工程技术股份有限公司 | A kind of method of on-line checking continuous casting billet liquid phase fraction and solidification end |
| CN112784367A (en) * | 2020-12-10 | 2021-05-11 | 江阴兴澄特种钢铁有限公司 | Method for calculating thickness of blank shell at position of continuous casting roller row and solidification tail end of casting machine |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113804482A (en) | 2021-12-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107008837B (en) | A kind of inexpensive open die forging method of large size edger roll forging | |
| CN113804482B (en) | Method for rapidly detecting solidification end position of continuous casting billet | |
| CN105209194B (en) | The continuous casing of strand | |
| CN107096795A (en) | A kind of manufacture method for reducing edge defects of hot rolled strip steel | |
| CN110102579B (en) | Low-cost control method for eliminating width of slab wedge | |
| CN111299534B (en) | Method and device for determining reference roll gap under continuous casting light and heavy press | |
| CN113275385B (en) | Method for dynamically controlling to-be-rolled position of single-stand rolling mill | |
| CN202377264U (en) | Vertical roller hole pattern for eliminating streaky peeling defect of edge part of stainless steel hot-rolled strip steel | |
| CN111112345B (en) | Control method for automatically compensating deviation generated by calibration of horizontal rolling mill | |
| CN109226611A (en) | C-shaped section forging rolloff forming method | |
| CN211191919U (en) | Production equipment for producing large fillet or large chamfer continuous casting square billet/rectangular billet | |
| CN113084111B (en) | Method for correcting pressing precision of continuous casting withdrawal and straightening machine | |
| CN114669723B (en) | Control method for effective rolling interval of casting blank | |
| CN107520255A (en) | A kind of self-learning type inlet of rolling mill thickness optimization method | |
| CN113798462A (en) | Method for manually calibrating roll gap of withdrawal and straightening machine by using chain dummy bar | |
| CN108453226A (en) | A kind of rectangle steel billet back-end crop control method | |
| JP4312928B2 (en) | Metal rolling method | |
| CN109261861A (en) | A kind of class dish-type section process for manufacturing forging of the ratio of height to diameter less than 0.3 | |
| CN113664050B (en) | Steel rolling method and device | |
| KR100484091B1 (en) | Method for distributing the forging amount of square bar in hot free forging | |
| CN215614101U (en) | Steel rolling production line steel device before advancing | |
| CN109663818B (en) | Method for eliminating cracks generated in steel plate rolling process | |
| CN117340009A (en) | Light pressure starting method and system for finish rolling mill | |
| CN114951578A (en) | Soft reduction roll gap control method suitable for continuous casting square billet | |
| CN104561485A (en) | Production method for rolling crack-free steel plate |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |