CN114888248B - Correction method for length of continuous casting billet - Google Patents

Correction method for length of continuous casting billet Download PDF

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Publication number
CN114888248B
CN114888248B CN202210543851.5A CN202210543851A CN114888248B CN 114888248 B CN114888248 B CN 114888248B CN 202210543851 A CN202210543851 A CN 202210543851A CN 114888248 B CN114888248 B CN 114888248B
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length
continuous casting
casting billet
rolled piece
actual
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CN114888248A (en
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张存旺
徐兵伟
张联兵
林留户
王正刚
王利军
解彦波
李罗扣
胡洪
詹卫金
刘德乾
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Shougang Changzhi Iron and Steel Co Ltd
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Shougang Changzhi Iron and 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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/057—Manufacturing or calibrating the moulds
    • 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
    • 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)
  • Manufacturing & Machinery (AREA)
  • Continuous Casting (AREA)

Abstract

The embodiment of the application provides a method for correcting the length of a continuous casting billet, which comprises the following steps: obtaining a standard length of a continuous casting billet; determining the upper limit and the lower limit of the length of the rolled piece corresponding to the target runner according to the standard length of the continuous casting billet; acquiring the actual length of a continuous casting blank of the target runner, and determining the corrected length of the continuous casting blank of the target runner according to the size relation between the upper limit and the lower limit of the length of the rolled piece and the actual length of the continuous casting blank; and correcting the actual length of the continuous casting billet according to the corrected length of the continuous casting billet. According to the technical scheme, short-scale waste materials and longer cutting loss of continuous casting billets can be reduced to a certain extent, and therefore yield and economic benefits are improved.

Description

Correction method for length of continuous casting billet
Technical Field
The application relates to the technical field of continuous casting steel rolling, in particular to a method for correcting the length of a continuous casting billet.
Background
At present, when a bar is rolled, a high-temperature continuous casting billet is hot rolled into a required section size, generally, a billet is rolled and then is extended into a length of hundreds of meters or more than kilometers, the billet is sheared into a plurality of times of length by a flying shear, then is collected and cooled on a cooling bed, and then the times of length is sheared into a specified length. Because of the fluctuation of the section, length and rolled piece section of the continuous casting blank, the last length of the last length is inaccurate, bar products are delivered basically according to the fixed length, short-length waste materials and longer cutting loss can only be returned according to the waste steel, and the yield index and economic benefit are affected
Based on this, a method for correcting the length of a continuous casting billet is urgently needed by those skilled in the art, and short-length scrap and long cutting loss of the continuous casting billet can be reduced, so that yield and economic benefit are improved.
Disclosure of Invention
The embodiment of the application provides a correction method for the length of a continuous casting billet, and further short-scale waste materials and longer cutting loss of the continuous casting billet are reduced at least to a certain extent, so that the yield and economic benefit are improved.
Other features and advantages of the present application will be apparent from the following detailed description, or may be learned in part by the practice of the application.
According to an aspect of the embodiments of the present application, there is provided a method for correcting a length of a continuous casting slab, the method including: obtaining a standard length of a continuous casting billet; determining the upper limit and the lower limit of the length of the rolled piece corresponding to the target runner according to the standard length of the continuous casting billet; acquiring the actual length of a continuous casting blank of the target runner, and determining the corrected length of the continuous casting blank of the target runner according to the size relation between the upper limit and the lower limit of the length of the rolled piece and the actual length of the continuous casting blank; and correcting the actual length of the continuous casting billet according to the corrected length of the continuous casting billet.
In some embodiments of the present application, the determining, according to the standard length of the continuous casting billet, the upper limit and the lower limit of the length of the rolled piece corresponding to the target runner includes: acquiring a rolled piece length upper limit compensation value and a rolled piece length lower limit compensation value; determining the upper limit of the length of the rolled piece corresponding to the target runner based on the standard length of the continuous casting blank and the upper limit compensation value of the length of the rolled piece; and determining the lower limit of the length of the rolled piece corresponding to the target runner based on the standard length of the continuous casting blank and the lower limit compensation value of the length of the rolled piece.
In some embodiments of the present application, the determining the upper limit of the length of the rolled piece corresponding to the target runner based on the standard length of the continuous casting billet and the compensation value of the upper limit of the length of the rolled piece includes: and calculating the sum of the standard length of the continuous casting billet and the upper limit compensation value of the length of the rolled piece based on the standard length of the continuous casting billet and the upper limit compensation value of the length of the rolled piece, and taking the sum as the upper limit of the length of the rolled piece corresponding to the target runner.
In some embodiments of the present application, the determining the lower limit of the length of the rolled piece corresponding to the target runner based on the standard length of the continuous casting billet and the compensation value of the lower limit of the length of the rolled piece includes: and calculating the sum of the standard length of the continuous casting billet and the lower limit compensation value of the length of the rolled piece based on the standard length of the continuous casting billet and the lower limit compensation value of the length of the rolled piece, and taking the sum as the lower limit of the length of the rolled piece corresponding to the target runner.
In some embodiments of the present application, the obtaining the actual length of the continuous casting slab of the target runner includes: and detecting the continuous casting blank of the target runner by using a hot metal detector, and determining the actual length of the continuous casting blank of the target runner.
In some embodiments of the present application, the determining the corrected length of the continuous casting slab of the target runner according to the magnitude relation between the upper and lower limits of the length of the rolled piece and the actual length of the continuous casting slab includes: obtaining the diameter of a continuous casting billet of the target runner; obtaining a correction coefficient table, and selecting a target correction coefficient according to the diameter of the continuous casting billet, wherein the correction coefficient table comprises at least one diameter of the continuous casting billet and a corresponding correction coefficient; and determining the correction length of the continuous casting billet of the target runner according to the magnitude relation between the upper limit and the lower limit of the length of the rolled piece and the actual length of the continuous casting billet and the correction coefficient.
In some embodiments of the present application, the determining the corrected length of the continuous casting slab of the target runner according to the magnitude relation between the upper and lower limits of the length of the rolled piece and the actual length of the continuous casting slab and the correction coefficient includes: if the actual length of the continuous casting billet is greater than the lower limit of the length of the rolled piece and less than the upper limit of the length of the rolled piece, determining that the corrected length of the continuous casting billet of the target runner is 0; if the actual length of the continuous casting billet is smaller than or equal to the lower limit of the length of the rolled piece, determining the corrected length of the continuous casting billet of the target runner according to the actual length of the continuous casting billet, the lower limit of the length of the rolled piece and the correction coefficient; and if the actual length of the continuous casting billet is greater than or equal to the upper limit of the length of the rolled piece, determining the corrected length of the continuous casting billet of the target runner according to the actual length of the continuous casting billet, the upper limit of the length of the rolled piece and the correction coefficient.
In some embodiments of the present application, the determining the corrected length of the continuous casting slab for the target runner according to the actual length of the continuous casting slab, the lower limit of the length of the rolled piece, and the correction coefficient includes: calculating a first difference between the actual length of the continuous casting billet and the lower limit of the length of the rolled piece based on the actual length of the continuous casting billet and the lower limit of the length of the rolled piece; and calculating a first product of the first difference value and the correction coefficient as a continuous casting billet correction length of the target runner.
In some embodiments of the present application, the determining the corrected length of the continuous casting slab for the target runner according to the actual length of the continuous casting slab, the upper limit of the length of the rolled piece, and the correction coefficient includes: calculating a second difference between the actual length of the continuous casting billet and the lower limit of the length of the rolled piece based on the actual length of the continuous casting billet and the upper limit of the length of the rolled piece; and calculating a second product of the second difference value and the correction coefficient as a continuous casting billet correction length of the target runner.
In some embodiments of the present application, the correcting the actual length of the continuous casting billet according to the corrected length of the continuous casting billet includes: if the correction length of the continuous casting billet is negative, reducing the absolute value of the correction length of the continuous casting billet according to the actual length of the continuous casting billet; if the correction length of the continuous casting blank is a positive number, the absolute value of the correction length of the continuous casting blank is increased for the actual length of the continuous casting blank.
Based on the above scheme, the technical scheme provided by the application has at least the following advantages and improvements:
in the technical schemes provided by some embodiments of the application, an online adjustment method is adopted when the continuous casting billet is directly rolled, so that the length of the continuous casting billet with corresponding flow numbers can be quickly adjusted and corrected according to the change of the total length of the finished product rolled piece, and the length of the cut continuous casting billet with the length of multiple times of the finished product rolled piece is always kept within a reasonable length range. In addition, the technical scheme provided by the application can avoid excessive shearing waste, and the yield of bar products with different specifications can be improved by about 0.1-0.5%, wherein the yield of large-specification products is improved more obviously, and the economic benefit is obvious.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application. It is apparent that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art. In the drawings:
FIG. 1 shows a simplified flow diagram of a method of correcting a length of a continuous casting billet according to one embodiment of the present application;
FIG. 2 shows a simplified flow diagram of a method of correcting a length of a continuous casting billet according to one embodiment of the present application;
FIG. 3 shows a schematic diagram of a strand rolling line in one embodiment of the present application;
fig. 4 shows a flow diagram of a method of correcting the length of a continuous casting billet according to one embodiment of the present application.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments may be embodied in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art.
The flow diagrams depicted in the figures are exemplary only, and do not necessarily include all of the elements and operations/steps, nor must they be performed in the order described. For example, some operations/steps may be decomposed, and some operations/steps may be combined or partially combined, so that the order of actual execution may be changed according to actual situations.
Please refer to fig. 1.
Fig. 1 shows a flow diagram of a method of correcting a length of a continuous casting billet according to one embodiment of the present application, which may include steps S101-S104:
step S101, obtaining the standard length of the continuous casting billet.
And step S102, determining the upper limit and the lower limit of the length of the rolled piece corresponding to the target runner according to the standard length of the continuous casting billet.
Step S103, obtaining the actual length of the continuous casting blank of the target runner, and determining the correction length of the continuous casting blank of the target runner according to the size relation between the upper limit and the lower limit of the length of the rolled piece and the actual length of the continuous casting blank.
Step S104, correcting the actual length of the continuous casting billet according to the corrected length of the continuous casting billet.
In the application, the upper limit and the lower limit of the length of the rolled piece corresponding to each runner can be determined according to the difference of each runner, the actual length of the continuous casting billet is measured, and then the actual length of the continuous casting billet is corrected according to the size relation between the upper limit and the lower limit of the length of the rolled piece and the actual length of the continuous casting billet.
Please refer to fig. 2.
Fig. 2 is a flow chart illustrating a method for correcting a length of a continuous casting billet according to an embodiment of the present application, and the method for determining upper and lower limits of a length of a rolled piece corresponding to the target runner according to the standard length of the continuous casting billet may include steps S201 to S203:
step S201, obtaining a compensation value of the upper limit of the length of the rolled piece and a compensation value of the lower limit of the length of the rolled piece.
Step S202, determining the upper limit of the length of the rolled piece corresponding to the target runner based on the standard length of the continuous casting blank and the compensation value of the upper limit of the length of the rolled piece.
And step S203, determining the lower limit of the length of the rolled piece corresponding to the target runner based on the standard length of the continuous casting blank and the compensation value of the lower limit of the length of the rolled piece.
In this embodiment, the method for determining the upper limit of the length of the rolled piece corresponding to the target runner based on the standard length of the continuous casting billet and the compensation value of the upper limit of the length of the rolled piece may include: and calculating the sum of the standard length of the continuous casting billet and the upper limit compensation value of the length of the rolled piece based on the standard length of the continuous casting billet and the upper limit compensation value of the length of the rolled piece, and taking the sum as the upper limit of the length of the rolled piece corresponding to the target runner.
For example, the upper limit on the length of the product may be calculated according to the following formula: ls=lb+a 1 Wherein Ls is the upper limit of the length of the rolled piece, in m; lb is the standard length of the continuous casting billet, and the unit is m; a is that 1 The unit m is generally 0.3-0.5, and can be input and set for the upper limit compensation value of the length of the rolled piece.
In this embodiment, the method for determining the lower limit of the length of the rolled piece corresponding to the target runner based on the standard length of the continuous casting billet and the compensation value of the lower limit of the length of the rolled piece may include: and calculating the sum of the standard length of the continuous casting billet and the lower limit compensation value of the length of the rolled piece based on the standard length of the continuous casting billet and the lower limit compensation value of the length of the rolled piece, and taking the sum as the lower limit of the length of the rolled piece corresponding to the target runner.
For example, the upper limit on the length of the product may be calculated according to the following formula: lx=lb+a 2 Wherein Lx is the lower limit of the length of the rolled piece, and the unit is m; lb is the standard length of the continuous casting billet, and the unit is m; a is that 2 For the length lower limit compensation value of the rolled piece, the unit m can be generally selected from 0.9 to 1.5, and can be input and set.
In one embodiment of the present application, the method for obtaining the actual length of the continuous casting slab of the target runner may include: and detecting the continuous casting blank of the target runner by using a hot metal detector, and determining the actual length of the continuous casting blank of the target runner.
Please refer to fig. 3.
Fig. 3 shows a schematic diagram of a continuous casting billet rolling line in an embodiment of the present application. As shown in fig. 2, a hot metal detector 301 may be installed between the strand guide table 302 and the rolling mill 303, and may be used to determine the actual length of the strand for each runner. A hot metal detector is an infrared switch specifically designed for trouble-free operation in heavy industrial environments. WEB thermal metal detectors have been successfully used for many years in the following industries: steelworks, coke ovens, forge castings, garbage incinerators, blast furnaces, glass industry, general industry, and the like, wherever reliable signals are required using infrared radiation. The working principle of the hot metal detector is as follows: the lens transmits the infrared radiation to the infrared detector and when the radiation reaches a starting point, the electronic switch output line is triggered. The thermal metal detector is also specially designed with an electronic compensation circuit, which can compensate the change caused by the high temperature environment and the aging of the device, so that readjustment is not needed, and the high safety and reliability of operation can be ensured. Three different temperature set points provide the best temperature influence.
Please refer to fig. 4.
Fig. 4 is a flow chart illustrating a method for correcting a length of a continuous casting according to an embodiment of the present application, and the method for determining a corrected length of a continuous casting of the target runner according to a magnitude relation between an upper and lower limit of a length of the rolled piece and an actual length of the continuous casting may include steps S401 to S403:
step S401, obtaining the diameter of the continuous casting billet of the target runner.
Step S402, a correction coefficient table is obtained, and a target correction coefficient is selected according to the diameter of the continuous casting billet, wherein the correction coefficient table comprises at least one diameter of the continuous casting billet and a corresponding correction coefficient.
And step S403, determining the corrected length of the continuous casting blank of the target runner according to the magnitude relation between the upper limit and the lower limit of the length of the rolled piece and the actual length of the continuous casting blank and the correction coefficient.
In this embodiment, if the actual length of the continuous casting billet is greater than the lower limit of the length of the rolled piece and less than the upper limit of the length of the rolled piece, determining that the corrected length of the continuous casting billet of the target runner is 0; if the actual length of the continuous casting billet is smaller than or equal to the lower limit of the length of the rolled piece, determining the corrected length of the continuous casting billet of the target runner according to the actual length of the continuous casting billet, the lower limit of the length of the rolled piece and the correction coefficient; and if the actual length of the continuous casting billet is greater than or equal to the upper limit of the length of the rolled piece, determining the corrected length of the continuous casting billet of the target runner according to the actual length of the continuous casting billet, the upper limit of the length of the rolled piece and the correction coefficient.
In this embodiment, the method for determining the corrected length of the continuous casting slab of the target runner according to the actual length of the continuous casting slab, the lower limit of the length of the rolled piece, and the correction coefficient may include: calculating a first difference between the actual length of the continuous casting billet and the lower limit of the length of the rolled piece based on the actual length of the continuous casting billet and the lower limit of the length of the rolled piece; and calculating a first product of the first difference value and the correction coefficient as a continuous casting billet correction length of the target runner.
In this embodiment, the determining the corrected length of the continuous casting slab of the target runner according to the actual length of the continuous casting slab, the upper limit of the length of the rolled piece, and the correction coefficient includes: calculating a second difference between the actual length of the continuous casting billet and the lower limit of the length of the rolled piece based on the actual length of the continuous casting billet and the upper limit of the length of the rolled piece; and calculating a second product of the second difference value and the correction coefficient as a continuous casting billet correction length of the target runner.
For example, the correction coefficient table may be as shown in table 1.
Specification of specification Product name Correction coefficient&mm/m
Ф12 Reinforcing bar 5
Ф14 Reinforcing bar 7
Ф16 Reinforcing bar 9
Ф18 Reinforcing bar 11.5
Ф20 Reinforcing bar 14
Ф22 Reinforcing bar 17
TABLE 1
For example, taking a bar 18mm steel bar as an example, the total rolling length of a 150×150 continuous casting blank with a length of 12m is about 1080m, and 12 90m rolled pieces can be theoretically sheared into multiple lengths. However, the last length of the continuous casting billet and the rolled piece are often insufficient or obviously more than 90m due to the fluctuation of the sizes of the continuous casting billet and the rolled piece. At this time, a lower limit Lx=Lb+A of the length of the rolled piece can be set 1 =1080+0.3= 1080.3m, setting the final product length upper limit ls=lb+a2=1080+0.9= 1080.9m.
For another example, the actual length of the casting blank is measured to be between 1080.3 and 1080.9m, and the corrected length of the casting blank can be determined to be 0. If the length of the casting blank in a certain flow path is 1075.3m, the correction length lp= (Lx-Lsj) × = (1080.3-1075.3) ×11.5=57.5 (mm), and if the length of the casting blank in a certain flow path is 1090.9m, the correction length lp= (Ls-Lsj) × = (1080.9-1090.9) ×11.5 = -115 (mm).
In one embodiment of the present application, the method for correcting the actual length of the continuous casting billet according to the corrected length of the continuous casting billet may include: if the correction length of the continuous casting billet is negative, reducing the absolute value of the correction length of the continuous casting billet according to the actual length of the continuous casting billet; if the correction length of the continuous casting blank is a positive number, the absolute value of the correction length of the continuous casting blank is increased for the actual length of the continuous casting blank.
For example, if the length of a cast slab product in a certain runner is 1075.3m, the corrected length lp= (Lx-Lsj) × = (1080.3-1075.3) ×11.5=57.5 (mm), and the corresponding cast slab length is manually or automatically increased by 57.5mm. If the length of a continuous casting slab in a certain runner is 1090.9m, the correction length lp= (Ls-Lsj) × = (1080.9-1090.9) ×11.5 = -115 (mm), and the corresponding length of the continuous casting slab is manually or automatically reduced by 115mm.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the embodiments disclosed herein. This application is intended to cover any variations, uses, or adaptations of the application following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the application pertains.
It is to be understood that the present application is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims (8)

1. A method for correcting the length of a continuous casting slab, the method comprising:
obtaining a standard length of a continuous casting billet;
acquiring a rolled piece length upper limit compensation value and a rolled piece length lower limit compensation value;
determining the upper limit of the length of the rolled piece corresponding to the target runner based on the standard length of the continuous casting blank and the upper limit compensation value of the length of the rolled piece;
determining the lower limit of the length of the rolled piece corresponding to the target runner based on the standard length of the continuous casting blank and the lower limit compensation value of the length of the rolled piece;
obtaining the actual length of a continuous casting billet of the target runner and the diameter of the continuous casting billet of the target runner;
obtaining a correction coefficient table, and selecting a target correction coefficient according to the diameter of the continuous casting billet, wherein the correction coefficient table comprises at least one diameter of the continuous casting billet and a corresponding correction coefficient;
determining the correction length of the continuous casting blank of the target runner according to the size relation between the upper limit and the lower limit of the length of the rolled piece and the actual length of the continuous casting blank and the target correction coefficient;
and correcting the actual length of the continuous casting billet according to the corrected length of the continuous casting billet.
2. The method of claim 1, wherein determining the upper limit of the product length corresponding to the target runner based on the strand standard length and the upper limit compensation value of the product length comprises:
and calculating the sum of the standard length of the continuous casting billet and the upper limit compensation value of the length of the rolled piece based on the standard length of the continuous casting billet and the upper limit compensation value of the length of the rolled piece, and taking the sum as the upper limit of the length of the rolled piece corresponding to the target runner.
3. The method of claim 1, wherein determining the lower product length limit for the target runner based on the strand standard length and the lower product length limit offset value comprises:
and calculating the sum of the standard length of the continuous casting billet and the lower limit compensation value of the length of the rolled piece based on the standard length of the continuous casting billet and the lower limit compensation value of the length of the rolled piece, and taking the sum as the lower limit of the length of the rolled piece corresponding to the target runner.
4. The method of claim 1, wherein said obtaining the actual length of the strand of the target runner comprises:
and detecting the continuous casting blank of the target runner by using a hot metal detector, and determining the actual length of the continuous casting blank of the target runner.
5. The method of claim 1, wherein said determining a billet modification length of said target runner based on said target modification factor and a magnitude relationship between said upper and lower limits of said product length and said actual length of said billet comprises:
if the actual length of the continuous casting billet is greater than the lower limit of the length of the rolled piece and less than the upper limit of the length of the rolled piece, determining that the corrected length of the continuous casting billet of the target runner is 0;
if the actual length of the continuous casting billet is smaller than or equal to the lower limit of the length of the rolled piece, determining the corrected length of the continuous casting billet of the target runner according to the actual length of the continuous casting billet, the lower limit of the length of the rolled piece and the target correction coefficient;
and if the actual length of the continuous casting billet is greater than or equal to the upper limit of the length of the rolled piece, determining the continuous casting billet correction length of the target runner according to the actual length of the continuous casting billet, the upper limit of the length of the rolled piece and the target correction coefficient.
6. The method of claim 5, wherein said determining a billet modification length for said target runner based on said actual billet length, said lower product length limit, and said modification factor comprises:
calculating a first difference between the actual length of the continuous casting billet and the lower limit of the length of the rolled piece based on the actual length of the continuous casting billet and the lower limit of the length of the rolled piece;
and calculating a first product of the first difference value and the correction coefficient as a continuous casting billet correction length of the target runner.
7. The method of claim 5, wherein said determining a billet modification length for said target runner based on said actual billet length, said upper product length limit, and said modification factor comprises:
calculating a second difference between the actual length of the continuous casting billet and the lower limit of the length of the rolled piece based on the actual length of the continuous casting billet and the upper limit of the length of the rolled piece;
and calculating a second product of the second difference value and the correction coefficient as a continuous casting billet correction length of the target runner.
8. The method of claim 1, wherein said correcting said actual length of said strand based on said corrected length of said strand comprises:
if the correction length of the continuous casting billet is negative, reducing the absolute value of the correction length of the continuous casting billet according to the actual length of the continuous casting billet;
if the correction length of the continuous casting blank is a positive number, the absolute value of the correction length of the continuous casting blank is increased for the actual length of the continuous casting blank.
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