CN112387946A - Device and method for continuous casting of small square billets - Google Patents

Abstract

The invention relates to a device and a method for continuous casting of small square billets, which comprises a body, wherein the top of the body is provided with a handle, the body is provided with a support piece, the support piece is of a door-shaped structure and is vertical to the body and used for supporting a billet shell, and the device and the method are used for continuous casting heat exchange of a tundish, so that the problem of steel leakage and breakage of a joint in the continuous casting heat exchange process of the tundish is effectively solved, the number of continuous casting furnaces of a casting machine and the operation rate of the casting machine are improved, the production preparation time is saved, meanwhile, the casting preparation materials are reduced, the cutting loss of casting head and tail billets during starting and stopping are reduced, and the yield of molten steel is improved.

Description

Device and method for continuous casting of small square billets

Technical Field

The invention belongs to the technical field of metallurgical continuous casting, and particularly relates to a device and a method for continuous casting of small square billets.

Background

With the continuous development of continuous casting technology in China, the tundish with long service life can not meet the requirement of the existing production, and the operation rate of a continuous casting machine needs to be further improved urgently. The existing hot exchange process between pouring of the tundish greatly shortens the time loss caused by the time from the shutdown of the tundish to the restart of the tundish, can realize the operation of sending dummy ingots again without pulling tail billets, directly utilizes the tail billets stopped at the last pouring time to carry out the operation of changing the tundish, realizes the connection of the tail billets at the last pouring time and the head of the billets newly started to pour, and realizes the purpose of continuous operation of the tundish.

At present, the hot technique of trading of package in middle of multithread billet, in actual production operation, there is the general phenomenon that connects the breakout and break, and the stable production of giving the conticaster brings very big difficulty, and the number of times of the flowing of going wrong need pull out the tail billet again, and personnel need clear up because of the breakout leads to the cold steel of adhesion on the equipment and change the two cold equipments of damage, after finishing treating, send the dummy bar again, and seal the very conventional very inconvenient of dummy bar operation, very easily cause the problem that the casting rate is low. The increase of the accident rate causes the damage of equipment and the waste of time, and causes great passivity to the stable production of a continuous casting machine.

Therefore, how to solve the problem that the joint leaks and is broken in the process of heat exchange of the multi-flow billet tundish becomes a restriction factor of the tundish heat exchange technology.

Disclosure of Invention

The invention aims to provide a device and a method for continuous casting of billets.

The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a device for billet is watered even, includes the body, the top of body is equipped with the handle, and the body is equipped with support piece, and support piece is "door" type structure, and support piece is perpendicular with the body for support blank shell.

Specifically, the number of the supporting pieces is at least two, and the supporting pieces are crossed in a cross shape.

Specifically, the handle is of a U-shaped structure.

A method for continuous casting of billets comprises the following steps:

1) after the ladle is cast, controlling the liquid level of the tundish to be 200-300 mm, and blocking flow according to the length of each flow;

2) after the flow is blocked, the tail blank stays in the crystallizer, the submersed nozzle is taken down, and the submersed nozzle is used for repeatedly stirring the liquid core up and down in the tail blank;

3) fishing out the slag strips in the crystallizer by using a slag fishing rod;

4) before the tail blank is solidified, the continuous casting device is placed into a tail blank liquid core, the lower part of the continuous casting device is inserted into the tail blank, and a support piece supports the tail blank of the casting blank;

5) measuring by using a scale, and pulling down the tail blank to a position 200-300 mm away from the lower opening of the crystallizer;

6) after the flow is blocked, the tundish car is driven out, and a new tundish car is driven to a pouring position;

7) after the ladle is cast, if the tundish flows automatically, the swinging groove is opened for casting after circular flow, and if the tundish does not flow automatically, a thin oxygen tube is used for drainage;

8) opening a swing groove to inject molten steel without cold materials for about 5-8 s, transiting the swing groove for waiting for 4-6 s, starting vibration to stably increase the pulling speed until the liquid level is stable, increasing the pulling speed to a detection range, then automatically turning, and adding oil for lubrication in the starting process;

9) and after each flow is poured, the tundish is heated and changed into a result.

The invention has the following beneficial effects: the device and the method are used for continuous casting heat exchange of the tundish, the problem that the joint leaks and is broken in the continuous casting heat exchange process of the tundish is effectively solved, the number of continuous casting furnaces of the casting machine and the operation rate of the casting machine are improved, the production preparation time is saved, meanwhile, the casting preparation materials are reduced, the casting head and tail billet cutting loss is reduced, and the yield of molten steel is improved.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

In the figure: a handle; 2-body; 3-a support member.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings.

If fig. 1, a device that is used for little square billet to water even, including body 2, body 2 is the deformed steel bar diameter and is phi 28 ~ 35mm, body 2's top is equipped with handle 1, handle 1 is "U" type structure, the welding is on body 2, the diameter is phi 10 ~ 15mm, whole length is 100 ~ 150mm, be located the upper end of body, body 2 is equipped with support piece 3, support piece 3 is "door" type structure, support piece 3 comprises the platelike steel sheet of two "door" types, single length is little 10 ~ 20mm of little square billet section, the width is 15 ~ 30mm, height is 100 ~ 150mm, two support piece 3 are the cross, be located body 2's middle part.

A method for continuous casting of billets comprises the following steps:

1) after the ladle is cast, controlling the liquid level of the tundish to be 200-300 mm, and blocking flow according to the length of each flow;

2) after the flow is blocked, the tail blank stays in the crystallizer, the submersed nozzle is taken down, and the submersed nozzle is used for repeatedly stirring the liquid core up and down in the tail blank;

3) fishing out the slag strips in the crystallizer by using a slag fishing rod;

4) before the tail blank is solidified, the continuous casting device is placed into a tail blank liquid core, the lower part of the continuous casting device is inserted into the tail blank, and a support piece supports the tail blank of the casting blank;

5) measuring by using a scale, and pulling down the tail blank to a position 200-300 mm away from the lower opening of the crystallizer;

6) after the flow is blocked, the tundish car is driven out, and a new tundish car is driven to a pouring position;

7) after the ladle is cast, if the tundish flows automatically, the swinging groove is opened for casting after circular flow, and if the tundish does not flow automatically, a thin oxygen tube is used for drainage;

8) opening a swing groove to inject molten steel without cold materials for about 5-8 s, transiting the swing groove for waiting for 4-6 s, starting vibration to stably increase the pulling speed until the liquid level is stable, increasing the pulling speed to a detection range, then automatically turning, and adding oil for lubrication in the starting process;

9) and after each flow is poured, the tundish is heated and changed into a result.

The use method of the invention comprises the following steps: the handle 1 part is in the upper end of body 2, and the personnel of being convenient for are handheld or use the instrument to be picked up, and support piece 3 is in the intermediate position of body piece 2, perpendicular to body 2, and "door" type below, is convenient for insert the base shell in, plays the effect of supporting the base shell, and body 2 inserts behind the solidification of tail base core and is connected with the position of opening the casting head base and play the effect of preventing the breaking.

The continuous casting device is placed in the casting blank liquid core before the tail blank is solidified, the designed support piece 3 supports the surrounding blank shells, the problem of serious steel leakage caused by shrinkage of the blank shells is effectively solved, meanwhile, the problem that the continuous casting device falls into the liquid core and is inclined is solved, the lower portion of the body 2 is inserted into the liquid core of the tail blank, the upper portion of the body is connected with the head blank which is subjected to casting, the continuous casting device is used in a crystallizer for continuous casting heat exchange of a tundish and is placed in the tail blank which is cast last time and used for supporting the blank shell of the tail blank, the blank heads formed by casting are connected, the good combination of the reconnection positions of the body and the tail blank is ensured, the designed large diameter can effectively prevent the casting molten steel from melting the body part, the effect of connecting the body and the tail blank is achieved, and the problem that the joint is pulled to be. In conclusion, the invention effectively solves the problem that the joint leaks and is broken in the continuous casting heat exchange process of the tundish.

The present invention is not limited to the above embodiments, and any structural changes made under the teaching of the present invention shall fall within the scope of the present invention, which is similar or similar to the technical solutions of the present invention.

The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.

Claims (4)

1. The utility model provides a device that is used for little square billet to water even, its characterized in that includes the body, the top of body is equipped with the handle, and the body is equipped with support piece, and support piece is "door" type structure, and support piece and body are perpendicular for support blank shell.

2. The continuous billet casting device according to claim 1, wherein the number of the supporting members is at least two, and the supporting members are crossed in a cross shape.

3. The apparatus of claim 1, wherein the handle is of a "U" shape.

4. The method for continuous casting of billets according to claims 1 to 2, characterised in that it comprises the following steps:

1) after the ladle is cast, controlling the liquid level of the tundish to be 200-300 mm, and blocking flow according to the length of each flow;

2) after the flow is blocked, the tail blank stays in the crystallizer, the submersed nozzle is taken down, and the submersed nozzle is used for repeatedly stirring the liquid core up and down in the tail blank;

3) fishing out the slag strips in the crystallizer by using a slag fishing rod;

4) before the tail blank is solidified, the continuous casting device is placed into a tail blank liquid core, the lower part of the continuous casting device is inserted into the tail blank, and a support piece supports the tail blank of the casting blank;

5) measuring by using a scale, and pulling down the tail blank to a position 200-300 mm away from the lower opening of the crystallizer;

6) after the flow is blocked, the tundish car is driven out, and a new tundish car is driven to a pouring position;

7) after the ladle is cast, if the tundish flows automatically, the swinging groove is opened for casting after circular flow, and if the tundish does not flow automatically, a thin oxygen tube is used for drainage;

8) opening a swing groove to inject molten steel without cold materials for about 5-8 s, transiting the swing groove for waiting for 4-6 s, starting vibration to stably increase the pulling speed until the liquid level is stable, increasing the pulling speed to a detection range, then automatically turning, and adding oil for lubrication in the starting process;

9) and after each flow is poured, the tundish is heated and changed into a result.

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