CN113894262A - Process flow for improving quality of casting blank and control system thereof - Google Patents
Process flow for improving quality of casting blank and control system thereof Download PDFInfo
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- CN113894262A CN113894262A CN202111126475.1A CN202111126475A CN113894262A CN 113894262 A CN113894262 A CN 113894262A CN 202111126475 A CN202111126475 A CN 202111126475A CN 113894262 A CN113894262 A CN 113894262A
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- powder
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- 238000005266 casting Methods 0.000 title claims abstract description 96
- 238000000034 method Methods 0.000 title claims abstract description 41
- 230000008569 process Effects 0.000 title claims abstract description 34
- 239000000843 powder Substances 0.000 claims abstract description 51
- 239000002893 slag Substances 0.000 claims abstract description 41
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 31
- 239000010959 steel Substances 0.000 claims abstract description 31
- 238000009749 continuous casting Methods 0.000 claims abstract description 21
- 238000007654 immersion Methods 0.000 claims abstract description 4
- 230000001681 protective effect Effects 0.000 claims description 8
- 238000003860 storage Methods 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 230000004907 flux Effects 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 239000007791 liquid phase Substances 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 3
- 238000005245 sintering Methods 0.000 claims description 3
- 230000026676 system process Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Images
Classifications
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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
- B22D11/165—Controlling or regulating processes or operations for the supply of casting powder
Abstract
The invention discloses a process flow for improving the quality of a casting blank and a control system thereof, wherein the process flow comprises the following steps: the process flow comprises the following equipment: the device comprises a continuous casting covering slag bin, a screw rotary feeding device, a covering slag guide pipe, a speed regulation controller, a continuous casting machine crystallizer, an immersion nozzle, a casting blank with a billet shell, a control cabinet and a display computer; the PLC automatic control system controls the screw rod to rotate the feeding device to realize stable and uniform feeding; and secondly, a casting start signal (namely a casting blank pulling speed signal) of the molten steel is collected automatically, the molten steel is poured, and the system is started automatically. According to the invention, the full-automatic, uniform and stable feeding control of the casting powder of the multi-strand square billet continuous casting machine is realized through the screw rotating feeding device, so that 3/4 tundish operators are reduced, the labor cost is saved, the operating environment of the station operators is improved, and the efficiency of the whole processing process is improved.
Description
Technical Field
The invention relates to the technical field of ferrous metallurgy continuous casting, in particular to a process flow for improving the quality of a casting blank and a control system thereof.
Background
The main functions of the covering slag in the continuous casting process are heat insulation, molten steel oxidation prevention, molten steel floating inclusion absorption, casting blank surface lubrication and heat transfer control, and the stable and uniform thickness of the covering slag in the crystallizer is an important factor for ensuring the smooth production of a casting machine and the quality of a casting blank.
The casting powder is manually added into the crystallizer, so that the adding amount is difficult to accurately control, the thickness of a casting powder layer fluctuates, the quality of a casting blank is influenced, and a continuous casting breakout accident can be caused in serious cases.
Disclosure of Invention
The invention aims to provide a process flow for improving the quality of a casting blank and a control system thereof, so as to solve the problems in the background technology.
2. In order to achieve the purpose, the invention provides the following technical scheme: a process flow for improving the quality of a casting blank comprises the following process flows:
the process flow comprises the following equipment:
(1) the device comprises a continuous casting covering slag bin, a screw rotary feeding device, a covering slag guide pipe, a speed regulation controller, a continuous casting machine crystallizer, an immersion nozzle, a casting blank with a billet shell, a control cabinet and a display computer;
(2) the PLC automatic control system controls the screw rod to rotate the feeding device to realize stable and uniform feeding; secondly, a signal (namely a casting blank pulling speed signal) for starting pouring of molten steel is collected automatically, molten steel is poured, and a system is started automatically; thirdly, casting blank pulling speed information is automatically acquired, the rotating speed of the screw is controlled according to the pulling speed, the pulling speed and the rotating speed of the screw are in a direct-proportion function relationship, the matching of the pulling speed and the adding amount of the casting powder is ensured, and the thickness of a casting powder layer in the crystallizer is ensured to be stable; fourthly, a multi-strand casting machine, wherein each strand of casting machine is separately controlled by a protective slag adding system;
(3) the control system has two regulation modes of manual and automatic, and when the automatic control fails, the manual protective slag adding mode is started;
the method comprises the following steps: before the production of a continuous casting machine, adding sufficient covering slag into a storage bin;
step two: aligning the outlet of the casting powder guide pipe to the wide position of the liquid level of the molten steel at the upper opening part of the crystallizer;
step three: when a tundish begins to pour, the system automatically acquires molten steel pouring information (namely casting blanks have pulling speed information), automatically starts a covering slag inclusion system according to the acquired information, and begins to add covering slag into a crystallizer; adding the casting powder into the crystallizer at the maximum speed within the time of 20-30' before the molten steel is poured, when the thickness of the casting powder in the crystallizer meets the process requirement (the total thickness of a liquid phase layer, a sintering layer and a powder adding layer is about 30mm), automatically reducing the speed of adding the casting powder, and keeping the subsequent speed of adding the casting powder consistent with the consumption speed of the casting powder in the crystallizer to keep the thickness of a stable casting powder layer in the crystallizer;
step four: when the casting blank pulling speed changes, the system acquires the change of the casting blank pulling speed, and the adding amount of the casting powder is adjusted through the screw rotating feeding device;
step five: when the molten steel stops pouring, the system collects a molten steel pouring stop signal and automatically stops adding the casting powder into the crystallizer.
Preferably, the control system has two regulation modes of manual and automatic, and is used when the automatic control fails, and the manual mode of adding the protective slag is started.
Preferably, the mold flux in the first step is added in a mode that the mold flux is lifted by a crane and is moved and poured into a storage bin.
A control system for a process flow for improving the quality of a casting blank is characterized in that: the method comprises the following automatic control system processes:
(1) system self-checking: when the fault occurs or the manual operation is performed, the automatic mode cannot be started; when the system has the condition, starting an automatic mode;
(2) acquiring a high level signal (enough level) of the liquid level of the casting powder in the casting powder storage bin;
(3) acquiring a position signal of an outlet of a casting powder guide pipe (aiming at the middle part of an upper opening of a crystallizer);
(4) acquiring a molten steel pouring starting signal;
(5) at t1 time of initial casting, at speed vmaxAdding a mold flux (t1, v) to the crystallizermaxSet according to the process requirements);
(6) obtaining a drawing speed vp1～vp7, adjusting the screw rotation speed v of the feeding devicez1～vz7, coordinating the adding speed of the covering slag with the blank drawing speed (debugging according to the process requirement);
(7) when the molten steel stops pouring, the adding of the covering slag is automatically stopped.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention realizes full-automatic, uniform and stable addition control of the casting powder of the multi-strand square billet continuous casting machine through the screw rotary feeding device, thereby not only reducing 3/4 post operators, saving labor cost, improving the post personnel operating environment, but also improving the efficiency of the whole processing process;
2. the invention realizes the automatic regulation of the adding speed of the casting powder according to the pulling speed of the continuous casting machine, ensures the stable thickness of the liquid phase of the casting powder in the crystallizer, further improves the quality of casting blanks, and simultaneously improves the consistency of all casting blanks;
3. according to the invention, the manual and full-automatic mutual switching function of the covering slag adding of the crystallizer in continuous casting production is realized, an applicable covering slag adding mode can be selected according to the situation, and the problem that the production cannot be carried out when the automatic adding fails is avoided;
4. the invention can accurately control the adding amount of the covering slag according to the processing requirement, thereby not only improving the quality and consistency of casting blanks, but also reducing the consumption of the covering slag and further reducing the production cost of raw materials.
Drawings
FIG. 1 is a schematic view of an automatic, continuous mold flux feeding system of a multi-strand billet caster of the present invention;
FIG. 2 is a block diagram of the system control of the present invention;
FIG. 3 is a schematic diagram of the system software flow of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-3, an embodiment of the present invention is shown: a process flow for improving the quality of a casting blank comprises the following process flows:
the process flow comprises the following equipment:
(1) the device comprises a continuous casting covering slag bin, a screw rotary feeding device, a covering slag guide pipe, a speed regulation controller, a continuous casting machine crystallizer, an immersion nozzle, a casting blank with a blank shell, a control cabinet and a display computer, wherein the speed regulation controller is used for regulating and controlling the opening and closing of the screw rotary feeding device, and each group of casting blanks with the blank shell is provided with a liquid-phase covering slag layer;
(2) the PLC automatic control system controls the screw rod to rotate the feeding device to realize stable and uniform feeding; secondly, a signal (namely a casting blank pulling speed signal) for starting pouring of molten steel is collected automatically, molten steel is poured, and a system is started automatically; thirdly, casting blank pulling speed information is automatically acquired, the rotating speed of the screw is controlled according to the pulling speed, the pulling speed and the rotating speed of the screw are in a direct-proportion function relationship, the matching of the pulling speed and the adding amount of the casting powder is ensured, and the thickness of a casting powder layer in the crystallizer is ensured to be stable; fourthly, a multi-strand casting machine, wherein each strand of casting machine is separately controlled by a protective slag adding system;
(3) the control system has two regulation modes of manual and automatic, and when the automatic control fails, the manual protective slag adding mode is started;
the method comprises the following steps: before the production of a continuous casting machine, adding sufficient covering slag into a storage bin;
step two: aligning the outlet of the casting powder guide pipe to the wide position of the liquid level of the molten steel at the upper opening part of the crystallizer;
step three: when a tundish begins to pour, the system automatically acquires molten steel pouring information (namely casting blanks have pulling speed information), automatically starts a covering slag inclusion system according to the acquired information, and begins to add covering slag into a crystallizer; adding the casting powder into the crystallizer at the maximum speed within the time of 20-30' before the molten steel is poured, when the thickness of the casting powder in the crystallizer meets the process requirement (the total thickness of a liquid phase layer, a sintering layer and a powder adding layer is about 30mm), automatically reducing the speed of adding the casting powder, and keeping the subsequent speed of adding the casting powder consistent with the consumption speed of the casting powder in the crystallizer to keep the thickness of a stable casting powder layer in the crystallizer;
step four: when the casting blank pulling speed changes, the system acquires the change of the casting blank pulling speed, and the adding amount of the casting powder is adjusted through the screw rotating feeding device;
step five: when the molten steel stops pouring, the system collects a molten steel pouring stop signal and automatically stops adding the casting powder into the crystallizer.
Control system has two kinds of regulation modes manual and automatic, use when automatic control breaks down, start manual covering slag mode, the functionality of this system has been improved, when avoiding the automatic system trouble, can't add reinforced and follow-up processing, covering slag joining mode in the step one is for lifting by crane through the driving and move the fortune and empty to the feed bin in, whole process carries out remote control through control panel, reduces operation workman's work load and artifical demand, and has promoted pay-off efficiency.
A control system for a process flow for improving the quality of a casting blank is characterized in that: the method comprises the following automatic control system processes:
(1) system self-checking: when the fault occurs or the manual operation is performed, the automatic mode cannot be started; when the system has the condition, starting an automatic mode;
(2) acquiring a high level signal (enough level) of the liquid level of the casting powder in the casting powder storage bin;
(3) acquiring a position signal of an outlet of a casting powder guide pipe (aiming at the middle part of an upper opening of a crystallizer);
(4) acquiring a molten steel pouring starting signal;
(5) at t1 time of initial casting, at speed vmaxAdding a mold flux (t1, v) to the crystallizermaxSet according to the process requirements);
(6) obtaining a drawing speed vp1～vp7, adjusting the screw rotation speed v of the feeding devicez1～vz7, coordinating the adding speed of the covering slag with the blank drawing speed (debugging according to the process requirement);
(7) when the molten steel stops pouring, the adding of the covering slag is automatically stopped.
PLC control points and description
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.
Claims (4)
1. A process flow for improving the quality of a casting blank is characterized by comprising the following steps: the method comprises the following process flows:
the process flow comprises the following equipment:
(1) the device comprises a continuous casting covering slag bin, a screw rotary feeding device, a covering slag guide pipe, a speed regulation controller, a continuous casting machine crystallizer, an immersion nozzle, a casting blank with a billet shell, a control cabinet and a display computer;
(2) the PLC automatic control system controls the screw rod to rotate the feeding device to realize stable and uniform feeding; secondly, a signal (namely a casting blank pulling speed signal) for starting pouring of molten steel is collected automatically, molten steel is poured, and a system is started automatically; thirdly, casting blank pulling speed information is automatically acquired, the rotating speed of the screw is controlled according to the pulling speed, the pulling speed and the rotating speed of the screw are in a direct-proportion function relationship, the matching of the pulling speed and the adding amount of the casting powder is ensured, and the thickness of a casting powder layer in the crystallizer is ensured to be stable; fourthly, a multi-strand casting machine, wherein each strand of casting machine is separately controlled by a protective slag adding system;
(3) the control system has two regulation modes of manual and automatic, and when the automatic control fails, the manual protective slag adding mode is started;
the method comprises the following steps: before the production of a continuous casting machine, adding sufficient covering slag into a storage bin;
step two: aligning the outlet of the casting powder guide pipe to the wide position of the liquid level of the molten steel at the upper opening part of the crystallizer;
step three: when a tundish begins to pour, the system automatically acquires molten steel pouring information (namely casting blanks have pulling speed information), automatically starts a covering slag inclusion system according to the acquired information, and begins to add covering slag into a crystallizer; adding the casting powder into the crystallizer at the maximum speed within the time of 20-30' before the molten steel is poured, when the thickness of the casting powder in the crystallizer meets the process requirement (the total thickness of a liquid phase layer, a sintering layer and a powder adding layer is about 30mm), automatically reducing the speed of adding the casting powder, and keeping the subsequent speed of adding the casting powder consistent with the consumption speed of the casting powder in the crystallizer to keep the thickness of a stable casting powder layer in the crystallizer;
step four: when the casting blank pulling speed changes, the system acquires the change of the casting blank pulling speed, and the adding amount of the casting powder is adjusted through the screw rotating feeding device;
step five: when the molten steel stops pouring, the system collects a molten steel pouring stop signal and automatically stops adding the casting powder into the crystallizer.
2. The process flow for improving the quality of a casting blank according to claim 1, which is characterized in that: the control system has two regulation modes of manual and automatic, and is used when the automatic control fails, and the manual protective slag adding mode is started.
3. The process flow for improving the quality of a casting blank according to claim 1, which is characterized in that: and the covering slag in the step one is added in a mode of hoisting by a travelling crane and moving and pouring into a storage bin.
4. A control system for a process flow for improving the quality of a casting blank is characterized in that: the method comprises the following automatic control system processes:
(1) system self-checking: when the fault occurs or the manual operation is performed, the automatic mode cannot be started; when the system has the condition, starting an automatic mode;
(2) acquiring a high level signal (enough level) of the liquid level of the casting powder in the casting powder storage bin;
(3) acquiring a position signal of an outlet of a casting powder guide pipe (aiming at the middle part of an upper opening of a crystallizer);
(4) acquiring a molten steel pouring starting signal;
(5) at t1 time of initial casting, at speed vmaxAdding a mold flux (t1, v) to the crystallizermaxSet according to the process requirements);
(6) obtaining a drawing speed vp1～vp7, adjusting the screw rotation speed v of the feeding devicez1～vz7, coordinating the adding speed of the covering slag with the blank drawing speed (debugging according to the process requirement);
(7) when the molten steel stops pouring, the adding of the covering slag is automatically stopped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202111126475.1A CN113894262A (en) | 2021-09-26 | 2021-09-26 | Process flow for improving quality of casting blank and control system thereof |
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| CN202111126475.1A CN113894262A (en) | 2021-09-26 | 2021-09-26 | Process flow for improving quality of casting blank and control system thereof |
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|---|---|---|---|---|
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2021
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| US5622218A (en) * | 1995-05-15 | 1997-04-22 | Hylsa S.A. De C.V. | Method and apparatus for continuous casting of steel materials |
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Application publication date: 20220107 |