CN116652138A - Blank pulling method for square blank - Google Patents

Blank pulling method for square blank Download PDF

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Publication number
CN116652138A
CN116652138A CN202310572948.3A CN202310572948A CN116652138A CN 116652138 A CN116652138 A CN 116652138A CN 202310572948 A CN202310572948 A CN 202310572948A CN 116652138 A CN116652138 A CN 116652138A
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CN
China
Prior art keywords
withdrawal
straightening machine
straightening
pulling
machine
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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.)
Pending
Application number
CN202310572948.3A
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Chinese (zh)
Inventor
谢长川
王郢
韩峰
幸伟
钱亮
高文星
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MCC Southern Continuous Casting Technology Engineering Co Ltd
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MCC Southern Continuous Casting Technology Engineering Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by MCC Southern Continuous Casting Technology Engineering Co Ltd filed Critical MCC Southern Continuous Casting Technology Engineering Co Ltd
Priority to CN202310572948.3A priority Critical patent/CN116652138A/en
Publication of CN116652138A publication Critical patent/CN116652138A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/1226—Accessories for subsequent treating or working cast stock in situ for straightening strands
    • 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
    • B22D11/20—Controlling or regulating processes or operations for removing 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
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

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

Abstract

The invention provides a billet withdrawal method of square billets, which is characterized in that different control modes are set according to whether a casting billet corresponding to a withdrawal and straightening machine meets a reduction condition or not, and the withdrawal and straightening machine corresponding to the casting billet meeting the reduction condition is set to be a position control mode, so that the withdrawal speed of the withdrawal and straightening machine applying large reduction is higher than the withdrawal speed of the previous withdrawal and straightening machine, and the casting billet is prevented from being extruded between the two withdrawal and straightening machines to cause distortion; the tension leveler corresponding to the casting blank meeting the reduction condition is set to be in a pressure control mode, and the roll gap of the tension leveler is only slightly smaller than that of the former frame by about 1mm because the tension leveler under the condition of no large reduction is not applied, when the equipment has a mechanical gap or the roll gap is controlled with errors, the transmission roller is easy to idle and plays a role in drawing the blank, therefore, the tension leveler is pressed on the casting blank by adopting a certain pressure in the pressure control mode, the transmission roller is ensured to have enough friction force to play a role in drawing the blank, the casting blank is ensured to bear tension all the time, and the occurrence probability of distortion appearance can be effectively reduced.

Description

Blank pulling method for square blank
Technical Field
The invention relates to the technical field of continuous casting processing, in particular to a billet drawing method of a square billet.
Background
In order to improve the internal compactness of the casting blank, the square billet casting machine often needs to implement larger reduction of the casting blank through a withdrawal and straightening machine with a plurality of racks. At this time, if the accuracy of the roller levelness of the withdrawal and straightening machine and the parallelism between the frames is not high, distortion of the cast slab is liable to be caused. In practice, due to the large number of frames, the installation accuracy of the withdrawal and straightening machine tends to be lowered after the withdrawal and straightening machine is used for a period of time. If no corresponding measures are taken, the casting blank is easy to twist, the fire cutting machine cannot cut the casting blank, and production accidents of the casting machine are caused.
For the above problems, no effective solution has been found, and therefore, there is an urgent need to design a practical solution capable of effectively improving the distortion when the billet is pressed.
Disclosure of Invention
In view of the above problems, the present invention aims to provide a method for drawing a square billet, so as to solve the problem that in the prior art, a casting blank is easy to twist due to factors such as low roller levelness of a withdrawal and straightening machine and low accuracy of parallelism among frames when the square billet is pressed down.
The invention provides a flatus drawing method, which comprises the following steps:
s1, in the process of square billet withdrawal by a multi-frame withdrawal and straightening machine, taking a withdrawal and straightening machine corresponding to a casting billet meeting a rolling condition as a first withdrawal and straightening machine corresponding to a casting billet not meeting the rolling condition as a second withdrawal and straightening machine;
s2, respectively setting control modes of the first tension leveler and the second tension leveler; wherein,,
setting the first withdrawal and straightening machine to be in a position control mode, and adjusting the withdrawal speed of the first withdrawal and straightening machine according to the reduction applied by the first withdrawal and straightening machine in the withdrawal and straightening process; setting the second withdrawal and straightening machine to a pressure control mode, keeping the withdrawal speed of the second withdrawal and straightening machine to be the same as the withdrawal speed of the previous withdrawal and straightening machine, and applying preset pressure to the casting blank to enable the casting blank corresponding to the second withdrawal and straightening machine to be in a tensile state;
s3, completing the billet drawing process of the square billets by the first withdrawal and straightening machine and the second withdrawal and straightening machine which are set by adopting a control mode.
In addition, preferably, the adjusting the pulling speed of the first pulling and straightening machine according to the pressing amount applied by the first pulling and straightening machine in the process of pulling and straightening includes:
the pulling speed of a previous pulling and straightening machine of the current first pulling and straightening machine is obtained, and the pulling speed is the most referred;
according to the reference pulling speed and the current pressing amount of the first pulling and straightening machine applied in the pulling and straightening process, a preset pulling and straightening machine pulling speed calculation formula is adopted to calculate the pulling and straightening machine pulling speed, and the calculated pulling and straightening machine pulling speed is set as the current pulling and straightening machine pulling speed.
In addition, preferably, the preset pull rate calculation formula is:
Vn＝Vn-1*Hn-1/Hn；
Hn＝Hn-1-△h；
wherein, vn is the pulling rate of the first tension leveler, vn-1 is the speed of the former tension leveler of the first tension leveler, hn-1 is the thickness of the casting blank corresponding to the former tension leveler, hn is the thickness of the casting blank corresponding to the first tension leveler, and Deltah is the actual pressing down amount of the first tension leveler in the process of drawing the blank.
In addition, preferably, before the first withdrawal and straightening machine and the second withdrawal and straightening machine set in the control mode complete the withdrawal process of the square billet, the method further includes:
taking the last withdrawal and straightening machine in the multi-machine frame withdrawal and straightening machines as a straightening and withdrawal and straightening machine;
and setting the straightening and withdrawal machine into a pressure control mode, and correcting the distortion on the casting blank by applying pressure on the casting blank.
In addition, preferably, in the process of setting the control modes of the first tension leveler and the second tension leveler respectively,
the withdrawal speed of the withdrawal and straightening machine near the lower port of the crystallizer is set to be the same as the withdrawal speed of the casting flow.
In addition, preferably, the multi-frame withdrawal and straightening machine comprises: at least 3 withdrawal and straightening machines.
In addition, the multi-rack tension leveler preferably comprises 6 tension levelers.
In addition, it is preferable that the reduction condition is set according to a central solid fraction of the cast slab.
According to the technical scheme, in the square billet withdrawal method provided by the invention, in the process of withdrawing square billets by the multi-frame withdrawal and straightening machine, different control modes are set according to whether the casting billets corresponding to the withdrawal and straightening machines meet the reduction conditions or not, and the withdrawal and straightening machines corresponding to the casting billets meeting the reduction conditions are set to be in the position control mode, so that the withdrawal speed of the withdrawal and straightening machine applying large reduction is higher than that of the previous withdrawal and straightening machine, and the casting billets are prevented from being extruded between the two withdrawal and straightening machines, so that distortion is avoided; the tension leveler corresponding to the casting blank meeting the reduction condition is set to be in a pressure control mode, and the roll gap of the tension leveler is only slightly smaller than that of the former frame by about 1mm because the tension leveler under the condition of no large reduction is not applied, when the equipment has a mechanical gap or the roll gap is controlled with errors, the transmission roller is easy to idle and plays a role in drawing the blank, therefore, the tension leveler is pressed on the casting blank by adopting a certain pressure in the pressure control mode, the transmission roller is ensured to have enough friction force to play a role in drawing the blank, the casting blank is ensured to bear tension all the time, and the occurrence probability of distortion appearance can be effectively reduced.
To the accomplishment of the foregoing and related ends, one or more aspects of the invention comprise the features hereinafter fully described. The following description and the annexed drawings set forth in detail certain illustrative aspects of the invention. These aspects are indicative, however, of but a few of the various ways in which the principles of the invention may be employed. Furthermore, the invention is intended to include all such aspects and their equivalents.
Drawings
Other objects and attainments together with a more complete understanding of the invention will become apparent and appreciated by referring to the following description taken in conjunction with the accompanying drawings. In the drawings:
FIG. 1 is a flow chart of a method of pulling a square billet according to an embodiment of the present invention;
fig. 2 is a schematic layout view of a multi-rack withdrawal and straightening machine according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It may be evident, however, that such embodiment(s) may be practiced without these specific details.
Aiming at the problem that in the prior art, a blank drawing method for square blanks is lack, which can effectively solve the problem that the blank is easy to distort due to factors such as low roller levelness of a withdrawal and straightening machine, low parallelism precision among frames and the like when the square blanks are pressed down.
Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
In order to illustrate the billet drawing method of the square billet provided by the invention, fig. 1 shows a flow of the billet drawing method of the square billet according to the embodiment of the invention; fig. 2 shows an arrangement of a multi-rack tension leveler according to an embodiment of the invention.
As shown in fig. 1 in combination with fig. 2, the method for drawing square billets provided by the invention comprises the following steps:
s1, in the process of square billet withdrawal by a multi-frame withdrawal and straightening machine, taking a withdrawal and straightening machine corresponding to a casting billet meeting a rolling condition as a first withdrawal and straightening machine corresponding to a casting billet not meeting the rolling condition as a second withdrawal and straightening machine;
s2, setting control modes of the first tension leveler and the second tension leveler respectively; wherein,,
setting the first withdrawal and straightening machine to be in a position control mode, and adjusting the withdrawal speed of the first withdrawal and straightening machine according to the reduction applied by the first withdrawal and straightening machine in the withdrawal and straightening process; setting the second withdrawal and straightening machine to be in a pressure control mode, keeping the withdrawal speed of the second withdrawal and straightening machine to be the same as the withdrawal speed of the former withdrawal and straightening machine, and applying preset pressure to the casting blank to enable the casting blank corresponding to the second withdrawal and straightening machine to be in a tensile state;
s3, completing the billet withdrawal process of the square billets by adopting the first withdrawal and straightening machine and the second withdrawal and straightening machine which are set in the control mode.
When the multi-frame withdrawal and straightening machine is used for carrying out reduction, the central solid-phase ratio of casting blanks at about 2 frames often meets the reduction condition. For other withdrawal and straightening machines that are not under pressure, there are two modes of control, one using position control and one pressure control, for example 160X160mm section, about 150KN. When the former is adopted, the second withdrawal and straightening machine which is a withdrawal and straightening machine under large pressure is not adopted, the roll gap of the second withdrawal and straightening machine can only be slightly smaller than that of the former frame by about 1mm, and when the equipment has a mechanical gap or the roll gap control has errors, the idle running of the driving roller is very easy to cause, and the withdrawal and straightening effect cannot be achieved. Therefore, when the withdrawal and straightening machine does not adopt large reduction, the withdrawal and straightening machine should adopt pressure control, namely, a certain pressure is adopted to press the casting blank, so that the driving roller is ensured to have enough friction force to play a role in drawing the blank.
Setting different control modes according to whether a casting blank corresponding to the withdrawal and straightening machine meets a reduction condition or not in the process of carrying out square billet withdrawal by the multi-frame withdrawal and straightening machine, setting the withdrawal and straightening machine corresponding to the casting blank meeting the reduction condition into a position control mode, enabling the withdrawal speed of the withdrawal and straightening machine applying large reduction to be larger than the withdrawal speed of the former withdrawal and straightening machine, and avoiding the casting blank from being extruded between the two withdrawal and straightening machines to cause distortion; the tension leveler corresponding to the casting blank meeting the reduction condition is set to be in a pressure control mode, and the roll gap of the tension leveler is only slightly smaller than that of the former frame by about 1mm because the tension leveler under the condition of no large reduction is not applied, when the equipment has a mechanical gap or the roll gap is controlled with errors, the transmission roller is easy to idle and plays a role in drawing the blank, therefore, the tension leveler is pressed on the casting blank by adopting a certain pressure in the pressure control mode, the transmission roller is ensured to have enough friction force to play a role in drawing the blank, the casting blank is ensured to bear tension all the time, and the occurrence probability of distortion appearance can be effectively reduced.
As a preferred aspect of the present invention, adjusting the pull rate of the first withdrawal apparatus according to the amount of depression applied by the first withdrawal apparatus during the withdrawal of the blank includes:
the pulling speed of a previous pulling and straightening machine of the current first pulling and straightening machine is obtained, and the pulling speed is the most referred to;
according to the reference pulling speed and the pressing amount applied by the current first pulling and straightening machine in the pulling and straightening process, a preset pulling and straightening machine pulling speed calculation formula is adopted to calculate the pulling speed of the first pulling and straightening machine, and the calculated pulling speed is set as the current pulling speed of the first pulling and straightening machine.
The casting blank corresponding to the first withdrawal and straightening machine meets the reduction condition, so that in the process of withdrawing the casting blank, the first withdrawal and straightening machine applies a large reduction, and at this time, the withdrawal speed of the first withdrawal and straightening machine is adjusted according to the large reduction and the withdrawal speed of the previous withdrawal and straightening machine positioned in the first withdrawal and straightening machine so that the withdrawal speed of the first withdrawal and straightening machine is larger than the withdrawal speed of the previous withdrawal and straightening machine, wherein the previous withdrawal and straightening machine of the current first withdrawal and straightening machine refers to the withdrawal and straightening machine which pulls the casting blank in the direction of withdrawing the casting blank. When the first withdrawal and straightening machine performs large reduction, the frame generates large withdrawal resistance, and if the withdrawal speed is smaller than or equal to that of the previous withdrawal and straightening machine, a casting blank is easily extruded between the two frames, so that distortion is caused. The former tension leveler of the first tension leveler can be the first tension leveler or the second tension leveler.
As a preferable scheme of the invention, the preset pull rate calculation formula is as follows:
V n ＝V n-1 *H n-1 /H n ；
H n ＝H n-1 -△h；
wherein V is n For the pulling speed of the first pulling and straightening machine, V n-1 For the speed of the former of the first stretching machine, H n-1 H is the thickness of the casting blank corresponding to the former withdrawal and straightening machine n And delta h is the thickness of the casting blank corresponding to the first withdrawal and straightening machine, and is the actual pressing reduction of the first withdrawal and straightening machine in the process of withdrawing the casting blank.
After the speed control method is adopted, if the first tension leveler is pressed down, the roll surface linear speed is higher than that of the previous tension leveler. Although the first drawing machine generates larger drawing resistance, the friction force which can be implemented is larger, the speed is higher than that of the former drawing machine, and the casting blank between the first drawing machine and the former drawing machine forms tension to avoid extrusion distortion. If the withdrawal machine following the first withdrawal machine which is subjected to the pressing is also subjected to the pressing, the speed is also higher than that of the first withdrawal machine, and tension is also formed. If the rear withdrawal and straightening machine is a second withdrawal and straightening machine, a pressure control mode is set, the deformation of the casting blank is small, the resistance is small, and the casting blank is not extruded by adopting the same linear speed as the first withdrawal and straightening machine.
As a preferred embodiment of the present invention, before the first withdrawal and straightening machine and the second withdrawal and straightening machine set in the control mode complete the withdrawal process of the square billet, the method further includes:
taking the last withdrawal and straightening machine in the multi-rack withdrawal and straightening machines as a straightening and straightening machine;
the straightening and withdrawal machine is set to a pressure control mode, and the distortion on the casting blank is corrected by applying pressure on the casting blank.
Because the first tension leveler is stressed greatly when the first tension leveler is pressed under a large pressure, the parallelism of the rollers between the front tension leveler and the rear tension leveler is difficult to ensure for a long time. When the rolls between the two withdrawal and straightening machines have a small angle, the cast strand is subjected to twisting forces if a large reduction is applied. When the casting blank leaves the last withdrawal and straightening machine, the stress can lead the casting blank to continuously twist, and the withdrawal and straightening machine is far away from the fire cutting machine, so that the angle of the twisting of the casting blank is larger when the casting blank finally enters the fire cutting machine. Therefore, in the arrangement of the withdrawal and straightening machines, the last withdrawal and straightening machine, and the last withdrawal and straightening machine acting on the cast strand in the withdrawal direction, should leave the large reduction zone, for example, 6 withdrawal and straightening machines, and when the previous 5 withdrawal and straightening machines are used for reduction, the last withdrawal and straightening machine needs to set the pressure control mode. And correcting tiny distortion of the casting blank caused by the large reduction of the front 5 withdrawal and straightening machines, so that the casting blank is restored to the upper and lower surfaces parallel to the roll surfaces of the withdrawal and straightening machines, and the casting blank is prevented from being distorted before entering the fire cutting machine.
As a preferred embodiment of the present invention, in the process of setting the control modes of the first tension leveler and the second tension leveler respectively,
the withdrawal speed of the withdrawal and straightening machine near the lower port of the crystallizer is set to be the same as the withdrawal speed of the casting flow.
In order to ensure that the pulling speed of the whole casting machine is stable and controllable, the roll surface linear speed of the first withdrawal and straightening machine, namely the withdrawal and straightening machine near the lower opening of the crystallizer, needs to be consistent with the set value of the casting flow speed. Assuming that the thickness dimension of the lower opening of the crystallizer is H, the drawing speed of the casting flow is set to be V. The thickness of the casting blank at the withdrawal and straightening machine near the lower opening of the crystallizer is H 1 If the pressing is performed, H 1 Equal to the set roll gap value, the speed set value is V 1 The tension leveler is a first tension leveler or a second tension leveler, and the tension speed of the tension leveler is set to V 1 This set point always coincides with the set point of the cast strand withdrawal speed.
As a preferred embodiment of the present invention, the multi-frame withdrawal and straightening machine includes: at least 3 withdrawal and straightening machines. The number of the multi-rack withdrawal and straightening machines can be determined according to actual conditions.
As a preferred embodiment of the present invention, the multi-rack withdrawal and straightening machine includes 6 withdrawal and straightening machines.
As a preferable embodiment of the present invention, the reduction condition is set according to the central solid fraction of the cast slab.
According to the method for drawing the square billets, in the process of drawing the square billets by the multi-frame drawing and straightening machine, different control modes are set according to whether the casting billets corresponding to the drawing and straightening machines meet the rolling condition or not, and the drawing and straightening machines corresponding to the casting billets meeting the rolling condition are set to be in the position control mode, so that the drawing speed of the drawing and straightening machine applying large rolling reduction is higher than that of the former drawing and straightening machine, and the casting billets are prevented from being extruded between the two drawing and straightening machines to cause distortion; the tension leveler corresponding to the casting blank meeting the reduction condition is set to be in a pressure control mode, and the roll gap of the tension leveler is only slightly smaller than that of the former frame by about 1mm because the tension leveler under the condition of no large reduction is not applied, when the equipment has a mechanical gap or the roll gap is controlled with errors, the transmission roller is easy to idle and plays a role in drawing the blank, therefore, the tension leveler is pressed on the casting blank by adopting a certain pressure in the pressure control mode, the transmission roller is ensured to have enough friction force to play a role in drawing the blank, the casting blank is ensured to bear tension all the time, and the occurrence probability of distortion appearance can be effectively reduced.
The method for drawing a square billet according to the present invention is described above by way of example with reference to the accompanying drawings. However, it will be appreciated by those skilled in the art that various modifications may be made to the billet withdrawal method of the billet set forth in the foregoing invention without departing from the spirit of the invention. Accordingly, the scope of the invention should be determined from the following claims.

Claims (8)

1. A method for pulling square billets, comprising the steps of:
s1, in the process of square billet withdrawal by a multi-frame withdrawal and straightening machine, taking a withdrawal and straightening machine corresponding to a casting billet meeting a rolling condition as a first withdrawal and straightening machine corresponding to a casting billet not meeting the rolling condition as a second withdrawal and straightening machine;
s2, respectively setting control modes of the first tension leveler and the second tension leveler; wherein,,
setting the first withdrawal and straightening machine to be in a position control mode, and adjusting the withdrawal speed of the first withdrawal and straightening machine according to the reduction applied by the first withdrawal and straightening machine in the withdrawal and straightening process; setting the second withdrawal and straightening machine to a pressure control mode, keeping the withdrawal speed of the second withdrawal and straightening machine to be the same as the withdrawal speed of the previous withdrawal and straightening machine, and applying preset pressure to the casting blank to enable the casting blank corresponding to the second withdrawal and straightening machine to be in a tensile state;
s3, completing the billet drawing process of the square billets by the first withdrawal and straightening machine and the second withdrawal and straightening machine which are set by adopting a control mode.
2. The method of drawing a square billet according to claim 1, wherein the adjusting the drawing speed of the first drawing machine according to the amount of depression applied by the first drawing machine during the drawing comprises:
the pulling speed of a previous pulling and straightening machine of the current first pulling and straightening machine is obtained, and the pulling speed is the most referred;
according to the reference pulling speed and the current pressing amount of the first pulling and straightening machine applied in the pulling and straightening process, a preset pulling and straightening machine pulling speed calculation formula is adopted to calculate the pulling and straightening machine pulling speed, and the calculated pulling and straightening machine pulling speed is set as the current pulling and straightening machine pulling speed.
3. The method for drawing a square billet according to claim 2, wherein the preset drawing speed calculation formula is:
V n ＝V n-1 *H n-1 /H n ；
H n ＝H n-1 -△h；
wherein the V is n For the pulling speed of the first pulling and straightening machine, V n-1 For the speed of the former of the first stretching machine, H n-1 H is the thickness of the casting blank corresponding to the former withdrawal and straightening machine n And delta h is the thickness of the casting blank corresponding to the first withdrawal and straightening machine, and is the actual pressing reduction of the first withdrawal and straightening machine in the process of withdrawing the casting blank.
4. The method for drawing a square billet according to claim 1, further comprising, before the first and second withdrawal and straightening machines set in the control mode complete the process of drawing the square billet:
taking the last withdrawal and straightening machine in the multi-machine frame withdrawal and straightening machines as a straightening and withdrawal and straightening machine;
and setting the straightening and withdrawal machine into a pressure control mode, and correcting the distortion on the casting blank by applying pressure on the casting blank.
5. The method for pulling a square billet according to claim 1, wherein, in the process of setting the control modes of the first pulling and straightening machine and the second pulling and straightening machine, respectively,
the withdrawal speed of the withdrawal and straightening machine near the lower port of the crystallizer is set to be the same as the withdrawal speed of the casting flow.
6. The method of drawing a square billet according to claim 1 wherein the multi-frame withdrawal and straightening machine comprises: at least 3 withdrawal and straightening machines.
7. The method of drawing a square billet according to claim 6 wherein the multi-frame withdrawal and straightening machine comprises 6 withdrawal and straightening machines.
8. A method for drawing a square billet according to claim 1 wherein,
the reduction condition is set according to the central solid phase ratio of the casting blank.
CN202310572948.3A 2023-05-19 2023-05-19 Blank pulling method for square blank Pending CN116652138A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310572948.3A CN116652138A (en) 2023-05-19 2023-05-19 Blank pulling method for square blank

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310572948.3A CN116652138A (en) 2023-05-19 2023-05-19 Blank pulling method for square blank

Publications (1)

Publication Number Publication Date
CN116652138A true CN116652138A (en) 2023-08-29

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ID=87712895

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310572948.3A Pending CN116652138A (en) 2023-05-19 2023-05-19 Blank pulling method for square blank

Country Status (1)

Country Link
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