CN110385409B - Starting method for continuous casting of square billet - Google Patents
Starting method for continuous casting of square billet Download PDFInfo
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- CN110385409B CN110385409B CN201910610720.2A CN201910610720A CN110385409B CN 110385409 B CN110385409 B CN 110385409B CN 201910610720 A CN201910610720 A CN 201910610720A CN 110385409 B CN110385409 B CN 110385409B
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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
- B22D11/08—Accessories for starting the casting procedure
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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
- B22D11/08—Accessories for starting the casting procedure
- B22D11/081—Starter bars
- B22D11/083—Starter bar head; Means for connecting or detaching starter bars and ingots
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Abstract
The method discloses a starting method for continuous casting of square billets, which comprises the following steps: after the dummy ingots are plugged in each flow, covering the dummy ingot head in the crystallizer with asbestos cloth, placing a cold material iron cylinder on a dummy ingot rod of the dummy ingot head in the crystallizer, using a charging hopper to distribute a cooling material into a quantitative material iron cylinder, ensuring that the pouring flow is quickly welded with the cold material iron cylinder in the crystallizer after the tundish is poured to form a primary blank shell, and pulling the square blank out of the crystallizer along a copper pipe by a dummy ingot rod hinged on the dummy ingot rod after starting. The method can solve the problems of difficult ingot guiding, production of tensile crack and steel leakage, increase of production cost and labor intensity in the conventional square billet continuous casting starting.
Description
Technical Field
The method relates to the technical field of steel manufacturing, in particular to a method for starting continuous casting of square billets.
Background
Continuous casting is an important process for changing liquid high-temperature molten steel into solid high-temperature casting blanks in steel production, and a continuous casting machine crystallizer is a cooling part for changing the molten steel into the casting blanks.
At present, a continuous casting machine crystallizer is a continuous casting equipment which receives molten steel poured from a tundish and solidifies the molten steel into a solid blank shell according to a specified section shape, and is the most critical equipment of a continuous casting machine. A continuous casting tundish for square billet (square billet) is started by using a cold iron cylinder which is made of a steel sheet through welding and is connected with a dummy bar head as a connector of a primary billet shell during casting. After casting, the fast welding of the injection flow with the cold iron cylinder and the dummy bar in the crystallizer can be ensured without the need of swinging and shunting, thereby effectively avoiding the problems of leakage, pull-off, adhesion or dummy bar removal difficulty and the like in the starting process of the sizing nozzle, greatly improving the success rate of continuous casting, reducing the rate of abnormal casting break of continuous casting, improving the yield of casting blanks and promoting the stability of full continuous casting production.
However, the following serious problems still exist in the starting method: 1. the square blank iron cylinder is designed into a round steel sheet, and has a large gap with a copper plate when being placed into a square crystallizer, so that a cold material is easy to fall into the gap when an operator distributes the cold material, the cold material contacts the copper plate of the crystallizer, and the starting resistance is increased when the cold material is heated and expanded, thereby causing starting tensile crack and steel leakage; the cold material is unevenly distributed, and the molten steel cannot be effectively welded with the dummy bar, so that the dummy bar is pulled off; the cold material is unevenly distributed, and molten steel is easy to wash out of a dovetail groove of the dummy bar, so that the dovetail groove is filled with steel, accidents such as difficult dummy bar removal are caused, and personal and property losses are caused. 2. The dummy bar installation process is complex in operation and high in labor intensity, the time for plugging the dummy bar every time is 10-15 minutes, and the time from shutdown to startup is about 105 minutes. 3. The dummy bar head is used for protecting the cover plate, an operation procedure is added virtually, the recovery difficulty of the protection cover plate is high, and the production cost and the labor intensity are increased.
Therefore, in order to ensure the improvement of the production efficiency of the billet continuous casting, achieve the purposes of quick start and improvement of the casting success rate, a series of improvements are urgently needed, the operation of the starting procedure is standardized, the risk of starting accidents is reduced, and the requirement of safe production is met.
Disclosure of Invention
The method aims to solve the problems that the pulling crack and steel leakage are produced in the conventional square billet continuous casting starting method, ingot guiding is difficult, and the production cost and the labor intensity are increased.
In order to solve the problems, the technical scheme of the method is as follows: the starting method for the continuous casting of the square billet comprises the following steps: after the dummy ingots are plugged in each flow, covering the dummy ingot head in the crystallizer with asbestos cloth, placing a cold material iron cylinder on a dummy ingot rod of the dummy ingot head in the crystallizer, using a charging hopper to distribute a cooling material into a quantitative material iron cylinder, ensuring that an injection flow is quickly welded with the cold material iron cylinder in the crystallizer after a tundish is poured to form a primary blank shell, and pulling a square blank out of the crystallizer along a copper pipe by a dummy ingot rod hinged on the dummy ingot rod after starting;
the cold charge iron cylinder comprises a square cylinder body, the bottom of the cylinder body is sealed, a rectangular opening for the dummy bar to pass through is formed in one side of the cylinder body, and the top of the cylinder body is open;
the dummy bar head comprises a dummy bar head with a bent head, two horizontally arranged fixing holes are formed in the two sides of the dummy bar, two bamboo chopsticks are inserted into the two fixing holes on the two sides for parallel positioning, and the original fixing hole for inserting a single wood block plug into the dummy bar is replaced;
the quantitative iron cylinder comprises a cylinder with a sealed bottom, and a handle is welded on the cylinder;
the feeding funnel comprises a square hopper body which is tightened inwards and downwards, a square column is arranged below the hopper body, the bottom of the column is sealed, and a long bent rod with a bent top is vertically arranged at one of four corners of the hopper body.
In the above technical solution, a more specific solution may be: the hopper body and the cylindrical body of the feeding hopper are integrally formed.
Further: the long bent rod of the feeding funnel is welded on the hopper body.
Further: and adopting the cold material iron cylinder, the dummy bar head, the quantitative material iron cylinder and the feeding hopper with different specifications and sizes according to the steel grades with different specifications and sizes.
Due to the adoption of the technical scheme, compared with the prior art, the method has the following beneficial effects:
according to the starting method for the continuous casting of the square billet, the cold material iron cylinder is changed into a cube from a cylinder body, and a rectangular opening is formed, so that a dummy bar can conveniently penetrate through the cold material iron cylinder, a gap between the cold material iron cylinder and a copper plate is controlled, and the cold material is prevented from falling into the gap and being blocked during material distribution; a specially designed quantitative material iron cylinder and a specially designed charging hopper are added, so that cold materials are effectively prevented from falling into a gap, convenience, rapidness and standardized operation of each flow are achieved, and the preparation time is effectively saved; 1 dummy bar fixing hole is additionally arranged on the dummy bar head, the dummy bar is positioned and fixed in parallel by using two holes of bamboo chopsticks, a wood block is not used for plugging the dummy bar, the operation is simplified, a dummy bar cover plate is not used, a dummy bar cover plate recovery procedure is omitted, the labor intensity of workers is reduced, the time for plugging the dummy bar can be completed within 3-5 minutes every time when the wood block is not used, and the work of plugging the dummy bar can be completed outside the line; the time from the shutdown of the casting machine to the startup of the casting machine can be controlled to be completed within 60 minutes, and as the use of the cold charge iron cylinder meets the operation requirements of protection equipment and production technology, the upper dummy ingot is only required to be covered by asbestos cloth, so that the recovery operation procedure of a dummy ingot cover plate is reduced;
the square billet continuous casting starting method improves the success rate of square billet continuous casting starting, improves the current 98 percent from the original 85 percent, and directly generates 15 ten thousand yuan of economic benefit each year; the problem that the dummy ingot is difficult to remove due to the facts that the starting dummy ingot is not pulled due to the nonstandard material distribution, the steel flow penetrates through the dummy ingot rod and the dovetail groove is filled is effectively solved; the preparation time of the casting machine is effectively shortened, the production efficiency is improved, the operation rate of the casting machine is improved, the labor intensity of workers is reduced, and the condition of casting machine equipment is protected.
Drawings
FIG. 1 is a front view of a cold iron cylinder according to an embodiment of the method;
FIG. 2 is a top view of a cold iron cylinder according to an embodiment of the method;
FIG. 3 is a schematic structural diagram of a dummy bar head according to an embodiment of the method;
FIG. 4 is a front view of an addition funnel according to an embodiment of the present method;
FIG. 5 is a top view of an addition funnel according to an embodiment of the present method;
FIG. 6 is a front view of a dosing iron cylinder according to an embodiment of the method;
FIG. 7 is a top view of a dosing iron cylinder according to an embodiment of the method.
Detailed Description
The embodiments of the method are further described in detail below with reference to the accompanying drawings:
the starting method for continuous casting of the square billet takes the HRB400E series steel grade with 165mm multiplied by 165mm section planned to be produced by a 7-flow square billet continuous casting machine as an example: when the production preparation is carried out, after the dummy ingot is plugged in each flow, the dummy ingot head in the crystallizer is covered by asbestos cloth, a cold charge iron cylinder 1 is placed on a dummy ingot rod 2-1 of the dummy ingot head 2 in the crystallizer, a feeding funnel is used for distributing a cooling material into a quantitative charge iron cylinder 3, the pouring flow is quickly welded with the cold charge iron cylinder in the crystallizer after the tundish is poured to form a primary blank shell, and after starting, a dummy ingot rod hinged on the dummy ingot rod pulls the square blank out of the crystallizer along a copper pipe.
In the process, a cold charge iron cylinder 1, a dummy bar head 2, a quantitative charge iron cylinder 3 and a charging hopper 4 are respectively modified, as shown in figures 1 to 7.
The cold charge iron cylinder 1 comprises a square cylinder body, the bottom of the cylinder body is sealed, a rectangular opening 1-1 for a dummy bar 2 to pass through is formed in one side of the cylinder body, and the top of the cylinder body is open. The cold charge iron cylinder 1 is changed into a cube from a cylinder body, and a rectangular opening 1-1 is formed, so that the cold charge iron cylinder can conveniently penetrate through a dummy bar 2-1, and a gap between the cold charge iron cylinder and a copper plate is controlled, so that the cold charge is prevented from falling into the gap and being blocked during material distribution; the specially designed quantitative material iron cylinder 3 and the feeding funnel 4 are added, so that the cold material falling clearance is effectively avoided, convenience, rapidness and standardized operation of each flow are achieved, and the preparation time is effectively saved.
The dummy bar head 2 comprises a dummy bar 2-1, the front end of which is provided with a dummy bar head 2-2 with a bent head, two sides of the dummy bar 2-1 are respectively provided with two horizontally arranged fixing holes 2-3, two bamboo chopsticks on two sides are inserted into the two fixing holes for parallel positioning, and one fixing hole 2-3 of the original single wood block plug inserted into the dummy bar 2-1 is replaced. The number of the dummy bar fixing holes 2-3 on the dummy bar head 2 is increased by 1, the dummy bar 2-2 is fixed by using double holes of bamboo chopsticks in a parallel positioning mode, a wood block is cancelled to plug the dummy bar, the operation is simplified, the use of a dummy bar cover plate is cancelled, the recovery process of the dummy bar cover plate is omitted, the labor intensity of workers is reduced, the time for plugging the dummy bar can be completed within 3-5 minutes every time when the wood block is cancelled, the work of plugging the dummy bar can be completed outside the line, the stop of a casting machine and the start-up time can be completed within 60 minutes, and the use of the cold material iron cylinder 1 meets the operation requirements of protection equipment and production technology, so that only asbestos cloth is required to cover the dummy bar head 2 when the dummy bar is loaded, and the recovery operation process of the dummy bar cover plate is further reduced.
The quantitative charging iron cylinder 3 comprises a cylinder 3-1 with a sealed bottom, and a handle 3-2 is welded on the cylinder 3-1.
The feeding funnel 4 comprises a square bucket body 4-2 which is tightened inwards and downwards, a square column-shaped body 4-1 is arranged below the bucket body 4-2, the bottom of the column-shaped body 4-1 is sealed, the seal is a seat plate, a long bent rod 4-3 with a bent top is vertically arranged at one of four corners of the bucket body 4-2, the bucket body 4-1 and the column-shaped body 4-2 of the feeding funnel 4 are integrally formed, and the long bent rod 4-3 of the feeding funnel 4 is welded on the bucket body 4-2.
According to the production of steel grades with different specifications and sizes, a cold material iron cylinder 1, a dummy bar head 2, a quantitative material iron cylinder 3 and a charging hopper 4 with different specifications and sizes are adopted.
The square billet continuous casting starting method improves the success rate of square billet continuous casting starting, improves the current 98 percent from the original 85 percent, and directly generates 15 ten thousand yuan of economic benefit each year; the problem that the dummy ingot is difficult to remove due to the facts that the starting dummy ingot is not pulled due to the nonstandard material distribution, the steel flow penetrates through the dummy ingot rod 2-1 and the dovetail groove is filled is effectively solved; the preparation time of the casting machine is effectively shortened, the production efficiency is improved, the operation rate of the casting machine is improved, the labor intensity of workers is reduced, and the condition of casting machine equipment is protected.
By using the method, the production process operation can be completed quickly, efficiently, safely and conveniently. And effective guarantee is provided for production safety. The statistical data inside the workshop is displayed, the time from shutdown to startup is controlled, the fastest production unit operation can be completed within 45 minutes, and the overall control time of the workshop unit can be completed within 60 minutes. Compared with the time for starting and stopping each time before modification, the time is saved by about 45 minutes.
Claims (5)
1. A starting method for continuous casting of square billets is characterized by comprising the following steps: after the dummy ingots are plugged in each flow, covering the dummy ingot head in the crystallizer with asbestos cloth, placing a cold material iron cylinder on a dummy ingot rod of the dummy ingot head in the crystallizer, using a charging hopper to distribute a cooling material into a quantitative material iron cylinder, ensuring that an injection flow is quickly welded with the cold material iron cylinder in the crystallizer after a tundish is poured to form a primary blank shell, and pulling a square blank out of the crystallizer along a copper pipe by a dummy ingot rod hinged on the dummy ingot rod after starting;
the cold charge iron cylinder comprises a square cylinder body, the bottom of the cylinder body is sealed, a rectangular opening for the dummy bar to pass through is formed in one side of the cylinder body, and the top of the cylinder body is open;
the dummy bar head comprises a dummy bar head with a bent head, two horizontally arranged fixing holes are formed in the two sides of the dummy bar, two bamboo chopsticks are inserted into the two fixing holes on the two sides for parallel positioning, and the original fixing hole for inserting a single wood block plug into the dummy bar is replaced;
the quantitative iron cylinder comprises a cylinder with a sealed bottom, and a handle is welded on the cylinder;
the feeding funnel comprises a square hopper body which is tightened inwards and downwards, a square column is arranged below the hopper body, the bottom of the column is sealed, and a long bent rod with a bent top is vertically arranged at one of four corners of the hopper body.
2. The method for starting the continuous casting of the square billet according to claim 1, wherein: the hopper body and the cylindrical body of the feeding hopper are integrally formed.
3. The method for starting continuous casting of a billet according to claim 1 or 2, wherein: the long bent rod of the feeding funnel is welded on the hopper body.
4. The method for starting continuous casting of a billet according to claim 1 or 2, wherein: and adopting the cold material iron cylinder, the dummy bar head, the quantitative material iron cylinder and the feeding hopper with different specifications and sizes according to the steel grades with different specifications and sizes.
5. The method for starting the continuous casting of the square billet according to claim 3, wherein: and adopting the cold material iron cylinder, the dummy bar head, the quantitative material iron cylinder and the feeding hopper with different specifications and sizes according to the steel grades with different specifications and sizes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910610720.2A CN110385409B (en) | 2019-07-08 | 2019-07-08 | Starting method for continuous casting of square billet |
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| CN201910610720.2A CN110385409B (en) | 2019-07-08 | 2019-07-08 | Starting method for continuous casting of square billet |
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| CN110385409A CN110385409A (en) | 2019-10-29 |
| CN110385409B true CN110385409B (en) | 2020-12-22 |
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| CN201910610720.2A Active CN110385409B (en) | 2019-07-08 | 2019-07-08 | Starting method for continuous casting of square billet |
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Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2282946Y (en) * | 1996-09-18 | 1998-06-03 | 安阳钢铁集团有限责任公司 | Disposable dummy ingot head for small square stock continuous caster |
| CN2334519Y (en) * | 1998-08-25 | 1999-08-25 | 首钢总公司 | Automatic pouring device for definited diameter pouring gate in continuous casting |
| CN2382494Y (en) * | 1999-07-02 | 2000-06-14 | 王国忱 | Arc regulating rigid dummy bar |
| JP2008023564A (en) * | 2006-07-21 | 2008-02-07 | Sumitomo Metal Ind Ltd | Dummy bar for continuous casting, and continuous casting method of steel |
| CN202291318U (en) * | 2011-11-01 | 2012-07-04 | 江苏泰富兴澄特殊钢有限公司 | Continuous casting ingot guide box for small square billet |
| CN202921883U (en) * | 2012-11-28 | 2013-05-08 | 唐山渤海冶金设备有限责任公司 | Dummy bar connecting structure |
| CN108393447B (en) * | 2018-05-31 | 2023-10-24 | 鞍山市泰和连铸机械有限公司 | Device for preventing dummy ingot head from tilting to inner arc |
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