CN114713784B - Method for optimizing cutting of continuous casting tail blank in fixed size - Google Patents

Method for optimizing cutting of continuous casting tail blank in fixed size Download PDF

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CN114713784B
CN114713784B CN202210447402.0A CN202210447402A CN114713784B CN 114713784 B CN114713784 B CN 114713784B CN 202210447402 A CN202210447402 A CN 202210447402A CN 114713784 B CN114713784 B CN 114713784B
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casting
length
flow
blank
fixed
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CN114713784A (en
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王雪原
戚春雷
董诗朋
曹娜
周胜刚
殷正国
张英男
李文博
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Chengde Jianlong Special Steel Co Ltd
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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
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/163—Controlling or regulating processes or operations for cutting cast stock
    • 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
    • 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
    • Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
    • Y02P90/30—Computing systems specially adapted for manufacturing

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Abstract

The invention provides a method for optimizing cutting of a continuous casting tail blank in a fixed size, which comprises the following steps: (1) Collecting parameters of a continuous casting machine, and obtaining the distance L between each casting flow blank head and a crystallizer outlet n The method comprises the steps of carrying out a first treatment on the surface of the (2) According to the weight W of molten steel in the tundish and constant pulling speed v 0 Calculating the number N of the casting blanks with fixed length produced by each casting flow before the pull speed is adjusted n The method comprises the steps of carrying out a first treatment on the surface of the (3) According to the calculation result of the step (2), distributing the molten steel in the tundish to each casting flow in proportion; (4) Adjusting the pulling rate of each casting stream to v according to the process requirements n The method comprises the steps of carrying out a first treatment on the surface of the (5) After the quantity of the cast blanks with fixed length produced by each casting flow reaches a target value and the weight of molten steel in the tundish meets the process requirement, closing the casting flow and performing tundish quick change operation; wherein n represents the number of streams of the casting stream, and n.gtoreq.2. The method provided by the invention improves the calculation accuracy and reduces the tail blank cutting amount, thereby improving the metal yield and improving the economic benefit.

Description

Method for optimizing cutting of continuous casting tail blank in fixed size
Technical Field
The invention belongs to the technical field of steel smelting, relates to a method for cutting a continuous casting tail billet, and particularly relates to a method for optimizing cutting of a continuous casting tail billet in a fixed size.
Background
Cutting is the most important ring in continuous casting process, and is responsible for cutting the casting blank into required length, which is an important link for improving metal yield. When the quick-change tundish operation is performed, the lengths of casting blanks flowing out of the crystallizer are different, so that the lengths of tail blanks after standard casting blanks are removed are difficult to ensure to be the whole length or the prepared length, the tail blanks actually cut are lengthened, and a large amount of waste of the tail blanks is caused.
At present, most domestic steel smelting plants do not perform the fixed-length optimized cutting of continuous casting tail blanks during quick change operation, but cut the casting blanks by adopting a method of combining a whole length with a spare length according to the length of the casting blanks from a crystallizer to a flame cutting machine after pouring of a tundish, so that the cut tail blanks are quite likely to be just the length of a whole length at the same time. Because the length of the tail blank does not meet the standard requirement, the part of casting blank can only be cut into waste as the tail blank, and huge economic loss can be caused each year.
Aiming at the current few continuous casting tail billet sizing optimization cutting methods, the method is mainly divided into two types: one is to stop the casting flow sequentially by estimating the casting flow remaining time; and the other is a calculation method for judging whether the molten steel amount in the ladle is a fixed-length multiple. The former needs to collect the pulling speed frequently from the basic level, and if the pulling speed fluctuation is abnormal, the calculation accuracy is greatly reduced; the latter needs to collect ladle weight value in advance, and in practical application, the precision is poor, and the optimization work is difficult to finish well.
Therefore, how to provide a method for optimizing cutting of continuous casting tail blanks in a fixed length, so that the calculation accuracy is improved, the tail blank cutting amount is reduced, the metal yield is improved, the economic benefit is improved, and the method becomes a problem which needs to be solved by the technicians in the field at present.
Disclosure of Invention
The invention aims to provide a method for optimizing cutting of a continuous casting tail billet in a fixed length mode, which improves calculation accuracy, reduces tail billet cutting quantity, improves metal yield and improves economic benefit.
In order to achieve the aim of the invention, the invention adopts the following technical scheme:
the invention provides a method for optimizing cutting of a continuous casting tail blank in a fixed size, which comprises the following steps:
(1) Collecting parameters of a continuous casting machine, and obtaining the distance L between each casting flow blank head and a crystallizer outlet n ；
(2) According to the weight W of molten steel in the tundish and constant pulling speed v 0 Calculating the number N of the casting blanks with fixed length produced by each casting flow before the pull speed is adjusted n ；
(3) According to the calculation result of the step (2), distributing the molten steel in the tundish to each casting flow in proportion;
(4) Adjusting the pulling rate of each casting stream to v according to the process requirements n ；
(5) After the quantity of the cast blanks with fixed length produced by each casting flow reaches a target value and the weight of molten steel in the tundish meets the process requirement, closing the casting flow and performing tundish quick change operation;
where n represents the number of streams of the cast strand and n.gtoreq.2, for example n may be 2,3,4,5, 6, 7 or 8, but is not limited to the values recited, and other non-recited values within this range are equally applicable.
According to the invention, the pulling speed of each casting flow in the multi-casting-flow continuous casting machine is regulated before the quick change operation of the tundish, so that molten steel in the tundish is distributed to each casting flow in proportion, the distance from the outlet of each casting flow crystallizer to the hot cutting machine is a multiple of the length of a fixed-length casting blank or a scattered-length casting blank, the cutting quantity of a continuous casting tail blank is reduced to the greatest extent, the quality of the casting blank is ensured, the metal yield is improved, and the economic benefit is improved.
Preferably, the calculating in the step (2) specifically includes:
(2.1) according to the weight W of molten steel in the tundish and the constant pulling speed v 0 Calculating the pouring time before the pull speed is adjustedWhere ρ is the density of the casting flow and S is the cross-sectional area of the casting flow;
(2.2) according to the casting time t obtained in the step (1), combining the length l of the fixed-length casting blank D Calculating the quantity of each casting flow out of the produced fixed-length casting blanks before the pull speed adjustmentWherein L is 0 Is the tail stock length set point.
In the invention, the number N of the casting blanks with the fixed length is produced after each casting outflow before the pulling adjustment n It is not necessary to make rounding, and it can be regarded as a virtual number.
Preferably, step (2.2) the L 0 The value of (2) is 2.5 to 4m, and may be, for example, 2.5m, 2.6m, 2.8m, 3m, 3.2m, 3.4m, 3.6m, 3.8m or 4m, and more preferably 2.5m, but is not limited to the recited values, and other non-recited values within the range are equally applicable.
Preferably, the process of the allocation in the step (3) is specifically:
(3.1) respectively adjusting the number N of the casting blanks with fixed length which are produced from each casting flow before the pulling adjustment obtained in the step (2) n By ROUNDDOWN (N) n 0) calculating a function to obtain the count R (N) of each casting flow out of the produced fixed-length casting blank before the pull-up adjustment n ) And adding to obtain the sum of the numbers Sigma R (N) of all casting flows out of the casting blank with fixed length before the pulling speed is adjusted n )；
(3.2) the number N of the casting blanks with fixed length which flow out of each casting before the pulling and adjusting obtained in the step (2) n Adding to obtain N Total (S) And for the obtained N Total (S) By ROUNDDOWN (N) Total (S) 0) calculating a function to obtain a sum of the counts R (N) of all casting flows out of the theoretical fixed-length casting blank Total (S) )；
(3.3) using the Sigma R (N) obtained in step (3.1) n ) And R (N) obtained in the step (3.2) Total (S) ) Calculate the count difference |R (N) Total (S) )-∑R(N n ) I, and evenly distributing the obtained count difference value to each casting flow to obtain the count M of each casting flow out of the casting blank with the fixed length after theoretical pulling and adjustment n ；
(3.4) the distance L between each casting die head and the outlet of the mold according to step (1) n Length l of combined fixed-length casting blank D Calculating the quantity of the fixed-length casting blanks produced by the casting blanks between each casting flow blank head and the outlet of the crystallizerAnd combining M obtained in the step (3.3) n Theoretically the weight of molten steel distributed per casting flow is calculated>
Preferably, the specific process of the adjustment in the step (4) is as follows:
(4.1) W obtained according to step (3.4) n Calculating the theoretical pull rate of each casting flow by combining the casting time t obtained in the step (2.1)
(4.2) according to a constant pull rate v 0 Setting the upper limit v of the pulling speed + And a lower pull speed limit v - The method comprises the steps of carrying out a first treatment on the surface of the When v 'obtained in the step (4.1)' n ∈(v - ,v + ) When the drawing speed v of the corresponding casting flow is adjusted n ＝v′ n The method comprises the steps of carrying out a first treatment on the surface of the When v 'obtained in the step (4.1)' n ≥v + When the drawing speed v of the corresponding casting flow is adjusted n ＝v + The method comprises the steps of carrying out a first treatment on the surface of the When v 'obtained in the step (4.1)' n ≤v - When the drawing speed v of the corresponding casting flow is adjusted n ＝v - 。
Preferably, step (4.2) is performed at the pull rate upper limit v + And constant pull rate v 0 The difference Deltav between 1 The method meets the following conditions: for example, it may be 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09 or 0.1, but is not limited to the recited values, and other non-recited values within the range are equally applicable.
Preferably, step (4.2) is performed at a lower pull rate limit v - And constant pull rate v 0 The difference Deltav between 2 The method meets the following conditions: for example, 0.01, 0.02, 0.04, 0.06, 0.08, 0.1, 0.12, 0.14, 0.16, 0.18 or 0.2, but not limited to the listOther non-recited values within the range of values are equally applicable.
The invention is realized by the pulling speed v of each casting flow n Limited at the upper limit v of the pulling speed + And a lower pull speed limit v - And the floating range of the upper limit and the lower limit of the pulling speed is strictly limited, so that adverse effects on the quality of the casting blank caused by too high or too low pulling speed are avoided, and the casting blank quality is always maintained at a higher level.
Preferably, the constant pull rate v 0 The value of (2) is 1-1.2m/min, for example, 1m/min, 1.02m/min, 1.04m/min, 1.06m/min, 1.08m/min, 1.1m/min, 1.12m/min, 1.14m/min, 1.16m/min, 1.18m/min or 1.2m/min, but not limited to the recited values, and other non-recited values within the range are equally applicable.
Preferably, the method further comprises preparing a bulk strand blank from the strand tail of each cast strand produced after the adjustment of the draw speed.
Preferably, the length l of the loose-gauge casting blank S Length l of casting blank with fixed length D The difference al between them satisfies: for example, it may be 0.01, 0.05, 0.1, 0.15, 0.2, 0.25 or 0.3, but is not limited to the recited values, and other non-recited values within the range of values are equally applicable.
Preferably, the length l of the sizing block D For example, the range of 6 to 10m may be 6m, 6.5m, 7m, 7.5m, 8m, 8.5m, 9m, 9.5m or 10m, but is not limited to the recited values, and other non-recited values within the range are equally applicable.
As a preferred technical solution of the present invention, the method comprises the steps of:
(1) Collecting parameters of a continuous casting machine, and obtaining the distance L between each casting flow blank head and a crystallizer outlet n ；
(2) According to the weight of molten steel in the tundishQuantity W and constant pull rate v 0 Calculating the number N of the casting blanks with fixed length produced by each casting flow before the pull speed is adjusted n The specific calculation process is as follows:
(2.1) according to the weight W of molten steel in the tundish and the constant pulling speed v 0 Calculating the pouring time before the pull speed is adjustedWhere ρ is the density of the casting flow and S is the cross-sectional area of the casting flow;
(2.2) according to the casting time t obtained in the step (1), combining the length l of the fixed-length casting blank D Calculating the quantity of each casting flow out of the produced fixed-length casting blanks before the pull speed adjustmentWherein L is 0 Is the length set value of the tail blank and is 2.5m;
(3) According to the calculation result of the step (2), the molten steel in the tundish is distributed to each casting flow in proportion, and the specific distribution process is as follows:
(3.1) respectively adjusting the number N of the casting blanks with fixed length which are produced from each casting flow before the pulling adjustment obtained in the step (2) n By ROUNDDOWN (N) n 0) calculating a function to obtain the count R (N) of each casting flow out of the produced fixed-length casting blank before the pull-up adjustment n ) And adding to obtain the sum of the numbers Sigma R (N) of all casting flows out of the casting blank with fixed length before the pulling speed is adjusted n )；
(3.2) the number N of the casting blanks with fixed length which flow out of each casting before the pulling and adjusting obtained in the step (2) n Adding to obtain N Total (S) And for the obtained N Total (S) By ROUNDDOWN (N) Total (S) 0) calculating a function to obtain a sum of the counts R (N) of all casting flows out of the theoretical fixed-length casting blank Total (S) )；
(3.3) using the Sigma R (N) obtained in step (3.1) n ) And R (N) obtained in the step (3.2) Total (S) ) Calculate the count difference |R (N) Total (S) )-∑R(N n ) I, and evenly distributing the obtained count difference value to each casting flow to obtain the count M of each casting flow out of the casting blank with the fixed length after theoretical pulling and adjustment n ；
(3.4) according to the stepsDistance L between each casting head obtained in step (1) and the outlet of the crystallizer n Length l of combined fixed-length casting blank D Calculating the quantity of the fixed-length casting blanks produced by the casting blanks between each casting flow blank head and the outlet of the crystallizerAnd combining M obtained in the step (3.3) n Theoretically the weight of molten steel distributed per casting flow is calculated>
(4) Adjusting the pulling rate of each casting stream to v according to the process requirements n The specific adjustment process is as follows:
(4.1) W obtained according to step (3.4) n Calculating the theoretical pull rate of each casting flow by combining the casting time t obtained in the step (2.1)
(4.2) according to a constant pull rate v 0 Setting the upper limit v of the pulling speed + And a lower pull speed limit v - The method comprises the steps of carrying out a first treatment on the surface of the When v 'obtained in the step (4.1)' n ∈(v - ,v + ) When the drawing speed v of the corresponding casting flow is adjusted n ＝v′ n The method comprises the steps of carrying out a first treatment on the surface of the When v 'obtained in the step (4.1)' n ≥v + When the drawing speed v of the corresponding casting flow is adjusted n ＝v + The method comprises the steps of carrying out a first treatment on the surface of the When v 'obtained in the step (4.1)' n ≤v - When the drawing speed v of the corresponding casting flow is adjusted n ＝v - The method comprises the steps of carrying out a first treatment on the surface of the Wherein the pull speed upper limit v + And constant pull rate v 0 The difference Deltav between 1 The method meets the following conditions: the lower pull speed limit v - And constant pull rate v 0 The difference Deltav between 2 The method meets the following conditions: /> And the constant pull rate v 0 The value range of (2) is 1-1.2m/min;
(5) Preparing a loose-scale casting blank by using the continuous casting tail blank produced by each casting flow after the pulling speed is regulated; length l of the loose ruler casting blank S Length l of casting blank with fixed length D The difference al between them satisfies:and the length l of the fixed-length casting blank D 6-10m;
(6) After the quantity of the cast blanks with fixed length produced by each casting flow reaches a target value and the weight of molten steel in the tundish meets the process requirement, closing the casting flow and performing tundish quick change operation;
wherein n represents the number of streams of the casting stream, and n.gtoreq.2.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, the pulling speed of each casting flow in the multi-casting-flow continuous casting machine is regulated before the quick change operation of the tundish, so that molten steel in the tundish is distributed to each casting flow in proportion, the distance from the outlet of each casting flow crystallizer to the hot cutting machine is a multiple of the length of a fixed-length casting blank or a scattered-length casting blank, the cutting quantity of the continuous casting tail blank is reduced to the greatest extent, and compared with the continuous casting tail blank before the speed regulation, the recovery rate of the continuous casting tail blank is improved to 24.3% at the highest, the metal yield is improved while the quality of the casting blank is ensured, and the economic benefit is improved.
Drawings
Fig. 1 is a flow chart of a method for optimizing cutting of a continuous casting tail billet in a fixed length.
Detailed Description
The technical scheme of the invention is further described by the following specific embodiments. It will be apparent to those skilled in the art that the examples are merely to aid in understanding the invention and are not to be construed as a specific limitation thereof.
Example 1
The embodiment provides a method for optimizing cutting of a continuous casting tail blank in a fixed size, which comprises the following steps:
(1) Collecting parameters of a 5-cast strand continuous casting machine, and obtaining the distance L between each cast strand billet head and an outlet of a crystallizer n Wherein n=1, 2,3,4,5;
(2) According to the weight W=18t of molten steel in the tundish and constant pulling speed v 0 Calculation of the number N of cast blanks per cast outflow produced to length before pull rate adjustment =1.1m/min n The specific calculation process is as follows:
(2.1) according to the weight W of molten steel in the tundish and the constant pulling speed v 0 Calculating the pouring time before the pull speed is adjustedWhere ρ is the density of the casting flow and S is the cross-sectional area of the casting flow;
(2.2) according to the casting time t obtained in the step (1), combining the length l of the fixed-length casting blank D Calculating the quantity of each casting flow out of the produced fixed-length casting blanks before the pull speed adjustmentWherein L is 0 Is the length set value of the tail blank;
(3) According to the calculation result of the step (2), the molten steel in the tundish is distributed to each casting flow in proportion, and the specific distribution process is as follows:
(3.1) respectively adjusting the number N of the casting blanks with fixed length which are produced from each casting flow before the pulling adjustment obtained in the step (2) n By ROUNDDOWN (N) n 0) calculating a function to obtain the count R (N) of each casting flow out of the produced fixed-length casting blank before the pull-up adjustment n ) And adding to obtain the sum of the numbers Sigma R (N) of all casting flows out of the casting blank with fixed length before the pulling speed is adjusted n )＝22；
(3.2) the number N of the casting blanks with fixed length which flow out of each casting before the pulling and adjusting obtained in the step (2) n Adding to obtain N Total (S) And for the obtained N Total (S) By ROUNDDOWN (N) Total (S) 0) calculating a function to obtain a sum of the counts R (N) of all casting flows out of the theoretical fixed-length casting blank Total (S) )＝25；
(3.3) using the Sigma R (N) obtained in step (3.1) n ) And R (N) obtained in the step (3.2) Total (S) ) Calculate the count difference |R (N) Total (S) )-∑R(N n ) The number difference value is evenly distributed to each casting flow to obtain the number M of each casting flow out of the casting blank with the fixed length after theoretical pulling adjustment n ；
(3.4) the distance L between each casting die head and the outlet of the mold according to step (1) n Length l of combined fixed-length casting blank D Calculating the quantity of the fixed-length casting blanks produced by the casting blanks between each casting flow blank head and the outlet of the crystallizerAnd combining M obtained in the step (3.3) n Theoretically the weight of molten steel distributed per casting flow is calculated>
(4) Adjusting the pulling rate of each casting stream to v according to the process requirements n The specific adjustment process is as follows:
(4.1) W obtained according to step (3.4) n Calculating the theoretical pull rate of each casting flow by combining the casting time t obtained in the step (2.1)
(4.2) according to a constant pull rate v 0 Set pull-up upper limit v=1.1m/min + =1.2 m/min and pull speed lower limit v - =0.9 m/min; when v 'obtained in the step (4.1)' n When E (0.9,1.2), the pulling speed v of the corresponding casting flow is adjusted n ＝v′ n The method comprises the steps of carrying out a first treatment on the surface of the When v 'obtained in the step (4.1)' n When the pulling speed is more than or equal to 1.2m/min, the pulling speed v of the corresponding casting flow is adjusted n =1.2m/min; when v 'obtained in the step (4.1)' n When the pulling speed v of the corresponding casting flow is less than or equal to 0.9m/min, the pulling speed v of the corresponding casting flow is adjusted n ＝0.9m/min；
(5) Preparing a loose-scale casting blank by using the continuous casting tail billet produced by each casting flow after the pulling speed adjustment, wherein the length l of the loose-scale casting blank S ＝7.30m；
(6) And after the quantity of the cast blanks with the fixed length produced by each casting flow reaches a target value and the weight of molten steel in the tundish meets the process requirement, closing the casting flow and performing tundish quick change operation.
The intermediate parameters and the final results involved in the calculation process of this example are shown in table 1.
TABLE 1
As can be seen from table 1: the total count of the fixed-length casting blanks obtained before the pulling speed adjustment is 22, the total count of the obtained scattered-length casting blanks is 3, and the actual length of the obtained tail blanks is 20.6m; and the total count of the obtained fixed-length casting blank is increased to 24 after the pulling speed is adjusted, the total count of the obtained scattered-length casting blank is reduced to 1, and the actual length of the obtained tail blank is reduced to 17.8m. The method can be obtained through conversion: compared with the recovery rate of the continuous casting tail billet before speed regulation, the recovery rate of the continuous casting tail billet is improved to 13.6 percent.
Example 2
The embodiment provides a method for optimizing cutting of a continuous casting tail blank in a fixed size, which comprises the following steps:
(1) Collecting parameters of a 5-cast strand continuous casting machine, and obtaining the distance L between each cast strand billet head and an outlet of a crystallizer n Wherein n=1, 2,3,4,5;
(2) According to the weight W=20t of molten steel in the ladle and constant pulling speed v 0 Calculation of the number N of cast blanks per cast outflow produced to length before pull rate adjustment =1.1m/min n The specific calculation process is as follows:
(2.1) according to the weight W of molten steel in the tundish and the constant pulling speed v 0 Calculating the pouring time before the pull speed is adjustedWhere ρ is the density of the casting flow and S is the cross-sectional area of the casting flow;
(2.2) according to the casting time t obtained in the step (1), combining the length l of the fixed-length casting blank D Calculating the quantity of each casting flow out of the produced fixed-length casting blanks before the pull speed adjustmentWherein L is 0 Is the length set value of the tail blank;
(3) According to the calculation result of the step (2), the molten steel in the tundish is distributed to each casting flow in proportion, and the specific distribution process is as follows:
(3.1) respectively adjusting the number N of the casting blanks with fixed length which are produced from each casting flow before the pulling adjustment obtained in the step (2) n By ROUNDDOWN (N) n 0) calculating a function to obtain the count R (N) of each casting flow out of the produced fixed-length casting blank before the pull-up adjustment n ) And adding to obtain the sum of the numbers Sigma R (N) of all casting flows out of the casting blank with fixed length before the pulling speed is adjusted n )＝25；
(3.2) the number N of the casting blanks with fixed length which flow out of each casting before the pulling and adjusting obtained in the step (2) n Adding to obtain N Total (S) And for the obtained N Total (S) By ROUNDDOWN (N) Total (S) 0) calculating a function to obtain a sum of the counts R (N) of all casting flows out of the theoretical fixed-length casting blank Total (S) )＝28；
(3.3) using the Sigma R (N) obtained in step (3.1) n ) And R (N) obtained in the step (3.2) Total (S) ) Calculate the count difference |R (N) Total (S) )-∑R(N n ) The number difference value is evenly distributed to each casting flow to obtain the number M of each casting flow out of the casting blank with the fixed length after theoretical pulling adjustment n ；
(3.4) the distance L between each casting die head and the outlet of the mold according to step (1) n Length l of combined fixed-length casting blank D Calculating the quantity of the fixed-length casting blanks produced by the casting blanks between each casting flow blank head and the outlet of the crystallizerAnd combining M obtained in the step (3.3) n Theoretically the weight of molten steel distributed per casting flow is calculated>
(4) Adjusting the pulling rate of each casting stream to v according to the process requirements n The specific adjustment process is as follows:
(4.1) W obtained according to step (3.4) n Calculating the theoretical pull rate of each casting flow by combining the casting time t obtained in the step (2.1)
(4.2) according to a constant pull rate v 0 Set pull-up upper limit v=1.1m/min + =1.2 m/min and pull speed lower limit v - =0.9 m/min; when v 'obtained in the step (4.1)' n When E (0.9,1.2), the pulling speed v of the corresponding casting flow is adjusted n ＝v′ n The method comprises the steps of carrying out a first treatment on the surface of the When v 'obtained in the step (4.1)' n When the pulling speed is more than or equal to 1.2m/min, the pulling speed v of the corresponding casting flow is adjusted n =1.2m/min; when v 'obtained in the step (4.1)' n When the pulling speed v of the corresponding casting flow is less than or equal to 0.9m/min, the pulling speed v of the corresponding casting flow is adjusted n ＝0.9m/min；
(5) Preparing a loose-scale casting blank by using the continuous casting tail billet produced by each casting flow after the pulling speed adjustment, wherein the length l of the loose-scale casting blank S ＝7.57m；
(6) And after the quantity of the cast blanks with the fixed length produced by each casting flow reaches a target value and the weight of molten steel in the tundish meets the process requirement, closing the casting flow and performing tundish quick change operation.
The intermediate parameters and the final results involved in the calculation process of this example are shown in table 2.
TABLE 2
As can be seen from table 1: the total count of the fixed-length casting blank obtained before the pulling speed adjustment is 25, the total count of the obtained scattered-length casting blank is 1, and the actual length of the obtained tail blank is 31.3m; and the total count of the obtained fixed-length casting blank after the pulling speed adjustment is 25 counts, the total count of the obtained scattered-length casting blank is increased to 2 counts, and the actual length of the obtained tail blank is reduced to 23.7m. The method can be obtained through conversion: compared with the recovery rate before speed regulation, the embodiment improves the recovery rate of the continuous casting tail billet to 24.3 percent.
Example 3
The embodiment provides a method for optimizing cutting of a continuous casting tail blank in a fixed size, which comprises the following steps:
(1) Collecting parameters of a 5-cast strand continuous casting machine, and obtaining the distance L between each cast strand billet head and an outlet of a crystallizer n Wherein n=1, 2,3,4,5;
(2) According to the weight W=16t of molten steel in the tundish and constant pulling speed v 0 Calculation of the number N of cast blanks per cast outflow produced to length before pull rate adjustment =1.0m/min n The specific calculation process is as follows:
(2.1) according to the weight W of molten steel in the tundish and the constant pulling speed v 0 Calculating the pouring time before the pull speed is adjustedWhere ρ is the density of the casting flow and S is the cross-sectional area of the casting flow;
(2.2) according to the casting time t obtained in the step (1), combining the length l of the fixed-length casting blank D Calculating the quantity of each casting flow out of the produced fixed-length casting blanks before the pull speed adjustmentWherein L is 0 Is the length set value of the tail blank;
(3) According to the calculation result of the step (2), the molten steel in the tundish is distributed to each casting flow in proportion, and the specific distribution process is as follows:
(3.1) respectively adjusting the number N of the casting blanks with fixed length which are produced from each casting flow before the pulling adjustment obtained in the step (2) n By ROUNDDOWN (N) n 0) calculating a function to obtain the count R (N) of each casting flow out of the produced fixed-length casting blank before the pull-up adjustment n ) And adding to obtain the sum of the numbers Sigma R (N) of all casting flows out of the casting blank with fixed length before the pulling speed is adjusted n )＝23；
(3.2) the number N of the casting blanks with fixed length which flow out of each casting before the pulling and adjusting obtained in the step (2) n Adding to obtain N Total (S) And is opposite toThe N is obtained Total (S) By ROUNDDOWN (N) Total (S) 0) calculating a function to obtain a sum of the counts R (N) of all casting flows out of the theoretical fixed-length casting blank Total (S) )＝25；
(3.3) using the Sigma R (N) obtained in step (3.1) n ) And R (N) obtained in the step (3.2) Total (S) ) Calculate the count difference |R (N) Total (S) )-∑R(N n ) The number difference value is evenly distributed to each casting flow to obtain the number M of each casting flow out of the casting blank with the fixed length after theoretical pulling adjustment n ；
(3.4) the distance L between each casting die head and the outlet of the mold according to step (1) n Length l of combined fixed-length casting blank D Calculating the quantity of the fixed-length casting blanks produced by the casting blanks between each casting flow blank head and the outlet of the crystallizerAnd combining M obtained in the step (3.3) n Theoretically the weight of molten steel distributed per casting flow is calculated>
(4) Adjusting the pulling rate of each casting stream to v according to the process requirements n The specific adjustment process is as follows:
(4.1) W obtained according to step (3.4) n Calculating the theoretical pull rate of each casting flow by combining the casting time t obtained in the step (2.1)
(4.2) according to a constant pull rate v 0 Set pull-up upper limit v=1.0m/min + =1.1 m/min and pull speed lower limit v - =0.8 m/min; when v 'obtained in the step (4.1)' n When E (0.8,1.1), the pulling speed v of the corresponding casting flow is adjusted n ＝v′ n The method comprises the steps of carrying out a first treatment on the surface of the When v 'obtained in the step (4.1)' n When the pulling speed is more than or equal to 1.1m/min, the pulling speed v of the corresponding casting flow is adjusted n =1.1 m/min; when v 'obtained in the step (4.1)' n When the pulling speed v of the corresponding casting flow is less than or equal to 0.8m/min, the pulling speed v of the corresponding casting flow is adjusted n ＝0.8m/min；
(5) Preparing a loose-scale casting blank by using the continuous casting tail billet produced by each casting flow after the pulling speed adjustment, wherein the length l of the loose-scale casting blank S ＝7.24m；
(6) And after the quantity of the cast blanks with the fixed length produced by each casting flow reaches a target value and the weight of molten steel in the tundish meets the process requirement, closing the casting flow and performing tundish quick change operation.
The intermediate parameters and the final results involved in the calculation process of this example are shown in table 3.
TABLE 3 Table 3
As can be seen from table 1: the total count of the fixed-length casting blanks obtained before the pulling speed adjustment is 23, the total count of the obtained scattered-length casting blanks is 2, and the actual length of the obtained tail blanks is 19.6m; and the total count of the obtained fixed-length casting blank is 25 after the pulling speed is adjusted, the total count of the obtained scattered-length casting blank is reduced to 0 count, and the actual length of the obtained tail blank is reduced to 16.9m. The method can be obtained through conversion: compared with the recovery rate before speed regulation, the embodiment improves the recovery rate of the continuous casting tail billet to 13.8 percent.
Example 4
The embodiment provides a method for optimizing cutting of a continuous casting tail blank in a fixed length, wherein the upper limit v of the drawing speed is not opposite except the step (4.2) + For limiting, v 1 ＝1.49m/min，v 2 ＝1.31m/min，v 3 ＝1.35m/min，v 4 ＝1.28m/min，v 5 The remaining steps and conditions are the same as those of example 1 except that the ratio is 0.90m/min, and thus the description thereof will be omitted herein.
Compared with example 1, although the total count of the cast slab obtained in the fixed-length casting slab obtained after the drawing speed adjustment in this example was increased to 25 counts, the total count of the cast slab obtained in the loose-length casting slab was reduced to 0 counts, the actual length of the obtained tail slab was reduced to 16.5m, and the recovery rate of the continuous casting tail slab was increased to 19.9%, the quality of the obtained cast slab was inferior to that in example 1 because the drawing speed of the 1 st to 4 th casting flows was too fast.
Example 5
The embodiment provides a method for optimizing cutting of a continuous casting tail blank in a fixed length, wherein the lower limit v of the drawing speed is not opposite except the step (4.2) - For limiting, v 1 ＝1.20m/min，v 2 ＝1.20m/min，v 3 ＝1.20m/min，v 4 ＝1.20m/min，v 5 The remaining steps and conditions are the same as those of example 1 except that the ratio of the catalyst to the catalyst is 0.07 m/min.
Compared with example 1, on the one hand, the total count of the cast billets of the fixed length obtained after the pulling speed adjustment is increased to 23 counts, the total count of the cast billets of the loose length obtained is reduced to 2 counts, the actual length of the obtained tail billets is reduced to 19.2m, and the recovery rate of the continuous casting tail billets is increased to 6.8%; on the other hand, the drawing speed of the 5 th casting flow is too slow, resulting in inferior production efficiency of the cast slab to that of example 1.
Therefore, the invention adjusts the pulling speed of each casting flow in the multi-casting-flow continuous casting machine before the quick change operation of the tundish, so that molten steel in the tundish is distributed to each casting flow in proportion, the distance from the outlet of each casting flow crystallizer to the hot cutting machine is a multiple of the length of a fixed-length casting blank or a scattered-length casting blank, the cutting quantity of the continuous casting tail blank is reduced to the greatest extent, and compared with the continuous casting tail blank before the speed regulation, the recovery rate of the continuous casting tail blank is improved to 24.3 percent at the highest, the metal yield is improved while the casting blank quality is ensured, and the economic benefit is improved.
The applicant declares that the above is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be apparent to those skilled in the art that any changes or substitutions that are easily conceivable within the technical scope of the present invention disclosed by the present invention fall within the scope of the present invention and the disclosure.

Claims (10)

1. A method for optimizing cutting of a continuous casting tail blank to length, which is characterized by comprising the following steps:
(1) Collecting parameters of continuous casting machine, obtaining eachDistance L between casting flow billet head and outlet of crystallizer n ；
(2) According to the weight W of molten steel in the tundish and constant pulling speed v 0 Calculating the number N of the casting blanks with fixed length produced by each casting flow before the pull speed is adjusted n The specific calculation process is as follows:
(2.1) according to the weight W of molten steel in the tundish and the constant pulling speed v 0 Calculating the pouring time before the pull speed is adjustedWhere ρ is the density of the casting flow and S is the cross-sectional area of the casting flow;
(2.2) according to the casting time t obtained in the step (1), combining the length l of the fixed-length casting blank D Calculating the quantity of each casting flow out of the produced fixed-length casting blanks before the pull speed adjustmentWherein L is 0 Is the length set value of the tail blank;
(3) According to the calculation result of the step (2), the molten steel in the tundish is distributed to each casting flow in proportion, and the specific distribution process is as follows:
(3.1) respectively adjusting the number N of the casting blanks with fixed length which are produced from each casting flow before the pulling adjustment obtained in the step (2) n By ROUNDDOWN (N) n 0) calculating a function to obtain the count R (N) of each casting flow out of the produced fixed-length casting blank before the pull-up adjustment n ) And adding to obtain the sum of the numbers Sigma R (N) of all casting flows out of the casting blank with fixed length before the pulling speed is adjusted n )；
(3.2) the number N of the casting blanks with fixed length which flow out of each casting before the pulling and adjusting obtained in the step (2) n Adding to obtain N Total (S) And for the obtained N Total (S) By ROUNDDOWN (N) Total (S) 0) calculating a function to obtain a sum of the counts R (N) of all casting flows out of the theoretical fixed-length casting blank Total (S) )；
(3.3) using the Sigma R (N) obtained in step (3.1) n ) And R (N) obtained in the step (3.2) Total (S) ) Calculate the count difference |R (N) Total (S) )-∑R(N n ) I, and evenly distributing the obtained count difference value to each casting flow to obtain theoryCount M of each casting flow produced fixed-length casting blank after upward pulling speed adjustment n ；
(3.4) the distance L between each casting die head and the outlet of the mold according to step (1) n Length l of combined fixed-length casting blank D Calculating the quantity of the fixed-length casting blanks produced by the casting blanks between each casting flow blank head and the outlet of the crystallizerAnd combining M obtained in the step (3.3) n Theoretically the weight of molten steel distributed per casting flow is calculated>
(4) Adjusting the pulling rate of each casting stream to v according to the process requirements n The specific adjustment process is as follows:
(4.1) W obtained according to step (3.4) n Calculating the theoretical pull rate of each casting flow by combining the casting time t obtained in the step (2.1)
(4.2) according to a constant pull rate v 0 Setting the upper limit v of the pulling speed + And a lower pull speed limit v _ The method comprises the steps of carrying out a first treatment on the surface of the When v 'obtained in the step (4.1)' n ∈(v - ,v + ) When the drawing speed v of the corresponding casting flow is adjusted n ＝v′ n The method comprises the steps of carrying out a first treatment on the surface of the When v 'obtained in the step (4.1)' n ≥v + When the drawing speed v of the corresponding casting flow is adjusted n ＝v + The method comprises the steps of carrying out a first treatment on the surface of the When v 'obtained in the step (4.1)' n ≤v - When the drawing speed v of the corresponding casting flow is adjusted n ＝v - ；
(5) After the quantity of the cast blanks with fixed length produced by each casting flow reaches a target value and the weight of molten steel in the tundish meets the process requirement, closing the casting flow and performing tundish quick change operation;
wherein n represents the number of streams of the casting stream, and n.gtoreq.2.
2. The method according to claim 1, characterized in thatWherein, in the step (2.2), the L 0 The range of the value of (2.5-4 m).
3. The method according to claim 2, wherein step (2.2) is said L 0 The range of the value of (2) is 2.5m.
4. The method according to claim 1, wherein the pull rate upper limit v of step (4.2) + And constant pull rate v 0 The difference Deltav between 1 The method meets the following conditions:
5. the method of claim 4, wherein the pull rate lower limit v of step (4.2) - And constant pull rate v 0 The difference Deltav between 2 The method meets the following conditions:
6. the method of claim 5, wherein the constant pull rate v 0 The range of the value of (2) is 1-1.2m/min.
7. The method of claim 1, further comprising preparing a bulk strand from each cast strand produced from the casting run after the draw rate adjustment.
8. The method according to claim 7, wherein the length l of the loose strand S Length l of casting blank with fixed length D The difference al between them satisfies:
9. the method of claim 8, wherein the determiningLength l of ruler casting blank D 6-10m.
10. The method according to any one of claims 1-9, characterized in that the method comprises the steps of:
(1) Collecting parameters of a continuous casting machine, and obtaining the distance L between each casting flow blank head and a crystallizer outlet n ；
(2) According to the weight W of molten steel in the tundish and constant pulling speed v 0 Calculating the number N of the casting blanks with fixed length produced by each casting flow before the pull speed is adjusted n The specific calculation process is as follows:
(2.1) according to the weight W of molten steel in the tundish and the constant pulling speed v 0 Calculating the pouring time before the pull speed is adjustedWhere ρ is the density of the casting flow and S is the cross-sectional area of the casting flow;
(2.2) according to the casting time t obtained in the step (1), combining the length l of the fixed-length casting blank D Calculating the quantity of each casting flow out of the produced fixed-length casting blanks before the pull speed adjustmentWherein L is 0 Is the length set value of the tail blank and is 2.5m;
(3) According to the calculation result of the step (2), the molten steel in the tundish is distributed to each casting flow in proportion, and the specific distribution process is as follows:
(3.1) respectively adjusting the number N of the casting blanks with fixed length which are produced from each casting flow before the pulling adjustment obtained in the step (2) n By ROUNDDOWN (N) n 0) calculating a function to obtain the count R (N) of each casting flow out of the produced fixed-length casting blank before the pull-up adjustment n ) And adding to obtain the sum of the numbers Sigma R (N) of all casting flows out of the casting blank with fixed length before the pulling speed is adjusted n )；
(3.2) the number N of the casting blanks with fixed length which flow out of each casting before the pulling and adjusting obtained in the step (2) n Adding to obtain N Total (S) And for the obtained N Total (S) By ROUNDDOWN (N) Total (S) 0) function calculation to obtain the theoretical resultThe sum of the counts R (N) of the cast strands produced with the casting flows Total (S) )；
(3.3) using the Sigma R (N) obtained in step (3.1) n ) And R (N) obtained in the step (3.2) Total (S) ) Calculate the count difference |R (N) Total (S) )-∑R(N n ) I, and evenly distributing the obtained count difference value to each casting flow to obtain the count M of each casting flow out of the casting blank with the fixed length after theoretical pulling and adjustment n ；
(3.4) the distance L between each casting die head and the outlet of the mold according to step (1) n Length l of combined fixed-length casting blank D Calculating the quantity of the fixed-length casting blanks produced by the casting blanks between each casting flow blank head and the outlet of the crystallizerAnd combining M obtained in the step (3.3) n Theoretically the weight of molten steel distributed per casting flow is calculated>
(4) Adjusting the pulling rate of each casting stream to v according to the process requirements n The specific adjustment process is as follows:
(4.1) W obtained according to step (3.4) n Calculating the theoretical pull rate of each casting flow by combining the casting time t obtained in the step (2.1)
(4.2) according to a constant pull rate v 0 Setting the upper limit v of the pulling speed + And a lower pull speed limit v - The method comprises the steps of carrying out a first treatment on the surface of the When v 'obtained in the step (4.1)' n ∈(v - ,v + ) When the drawing speed v of the corresponding casting flow is adjusted n ＝v′ n The method comprises the steps of carrying out a first treatment on the surface of the When v 'obtained in the step (4.1)' n ≥v + When the drawing speed v of the corresponding casting flow is adjusted n ＝v + The method comprises the steps of carrying out a first treatment on the surface of the When v 'obtained in the step (4.1)' n ≤v - When the drawing speed v of the corresponding casting flow is adjusted n ＝v - The method comprises the steps of carrying out a first treatment on the surface of the Wherein the pull speed upper limit v + And constant pull rate v 0 Difference betweenΔv 1 The method meets the following conditions:the lower pull speed limit v - And constant pull rate v 0 The difference Deltav between 2 The method meets the following conditions: />And the constant pull rate v 0 The value range of (2) is 1-1.2m/min;
(5) Preparing a loose-scale casting blank by using the continuous casting tail blank produced by each casting flow after the pulling speed is regulated; length l of the loose ruler casting blank S Length l of casting blank with fixed length D The difference al between them satisfies:and the length l of the fixed-length casting blank D 6-10m;
(6) After the quantity of the cast blanks with fixed length produced by each casting flow reaches a target value and the weight of molten steel in the tundish meets the process requirement, closing the casting flow and performing tundish quick change operation;
wherein n represents the number of streams of the casting stream, and n.gtoreq.2.
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