JP4518976B2 - Synchronous continuous casting machine - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a synchronous continuous casting machine, and is capable of casting a thick slab (slab) even in a synchronous continuous casting machine such as a twin roll continuous casting machine or a belt type continuous casting machine. It is a devised one.

  The continuous casting machine continuously casts molten steel that has been refined, and directly produces a slab (slab or strip). The continuous casting method using a continuous casting machine is less segregated and has good surface quality compared to conventional ingot-making and ingot-making methods, and is suitable for producing steel plate slabs.

  As a mold used for the continuous casting machine, there are an asynchronous vibration mold in which the mold does not move with respect to the slab, a synchronous twin-roll mold in which the mold moves, and a belt mold.

FIG. 6 shows an example of the vibration mold 01, and the molten steel 04 is supplied through the nozzle 03 to the internal space (hot water reservoir) of the mold 02 that vibrates in the vertical direction (vertical vibration). In this example, the mold 02 has a funnel shape, the top opening is bulging (the long side is curved outward), the long side is narrowed from the top to the bottom, and the bottom opening is rectangular. It has become.
In the vibrating mold 01, the molten steel 04 supplied to the hot water pool portion is contacted with the mold 02 to remove heat and become a solidified shell, and is drawn out as a slab 05 from the lower surface of the mold 02. At this time, molten powder is supplied to ensure uniform lubrication between the wall surface of the mold 02 and the solidified shell.

  FIG. 7 shows an example of a twin roll mold 010. In this twin roll mold 010, a pair of rolls 011 and 012 rotating in opposite directions are arranged close to each other in parallel at the same height position, and both ends in the axial direction of the rolls 011 and 012 are roll end faces. It is partitioned by side weirs 013 and 014 (which are not shown in the figure). Molten steel 016 is supplied through an nozzle 015 to an internal space (a hot water pool portion) formed by being surrounded by the rolls 011 and 012 and the side weirs 013 and 014.

  When the rolls 011 and 012 rotate inward with respect to each other (when the molten steel 016 is rotated so as to be wound downward), the molten steel 016 is cooled by coming into contact with the rolls 011 and 012. As a result, the surfaces of the rolls 011 and 012 are solidified. A shell is formed. Both of these solidified shells grow as the roll rotates, and are pressed and integrated at the minimum gap portions of the rolls 011 and 012 and are taken out as a cast slab 017.

JP-A-61-74757

By the way, in the asynchronous continuous casting machine using the vibration mold, the slab is pulled out while the vibration mold and the slab move relative to each other, so that there is a limit to the slab drawing speed (casting speed). If the casting speed is increased beyond the limit speed, the slab breaks (breakout) and the operation must be stopped. Thus, in a continuous casting machine using a vibration mold, there is a limit to the increase in production because there is a limit to the casting speed.
On the other hand, in order to simplify the rolling process after casting, it is necessary to reduce the slab thickness. However, since it is necessary to insert a nozzle into the molds arranged in parallel, it is difficult to make the slab thickness 50 mm or less.

  On the other hand, a twin roll type continuous casting machine using a twin roll type mold can directly cast a thin cast piece with a thickness of several millimeters, greatly simplify the rolling process, and the roll and cast piece move synchronously. The drawing speed (casting speed) of the piece is fast. However, since the thickness of the slab was thin, there was a limit to the production increase.

  In view of the above-described prior art, the present invention produces a continuous caster such as a twin-roll continuous caster by maintaining a high casting speed and increasing the slab thickness without worrying about breakout. An object of the present invention is to provide a synchronous continuous casting machine capable of increasing the amount.

The configuration of the present invention for solving the above problems is as follows.
Synchronous continuous supply of molten steel between a pair of synchronously rotating rotating members arranged at intervals, and pulling out a slab formed by pressing a solidified shell solidified on the surface of each rotating member from the gap between the rotating members In the casting machine,
In the molten steel surface supplied between the rotating members, a length made of an iron-based material is provided at two positions on both ends with respect to the direction along the rotational axis of the rotating member and between the rotating members. A cooling material supply device that continuously supplies the cold material of the scale in a synchronized manner with the drawing speed of the slab and from the upper surface of the molten metal surface downward while being spaced from the rotating member It is characterized by.

The configuration of the present invention is as follows.
The cold material supply device bundles and supplies a plurality of the cold materials to the two positions, respectively.

The configuration of the present invention is as follows.
With respect to the direction from one rotating member to the other rotating member, the thickness of the cold material supplied to the two positions is the minimum cap portion where the distance between the pair of rotating members is the smallest. The thickness is such that the solidified shell solidified and grown on the surface of the member and the solidified shell solidified and grown on the surface of the cold material can be joined .

The configuration of the present invention is as follows.
The cold material supply device includes a payoff reel for feeding the cold material, and guide means for guiding the cold material to be fed toward the two positions.

The configuration of the present invention is as follows.
The rotating member may be a roll or a belt that circulates and rotates.

  In the present invention, since the cold material is supplied to both end portions of the molten steel supplied between the rotating members, even if the mutual interval between the rotating members is widened, both of the two formed on the surfaces of both rotating members are used. Since the solidified shell is connected via a solidified shell formed on the surface of the cold material, the slab drawn from the continuous casting machine has a solidified shell that is unsolidified in the center but solidified in a bag-bound form. And never break out. As a result, a thick cast slab can be produced by widening the roll interval in the synchronous continuous casting machine, and the rolling process can be simplified and the production amount can be increased as compared with the conventional case.

  Hereinafter, embodiments of the present invention will be described in detail based on the respective examples.

  A twin-roll continuous casting machine according to Embodiment 1 of the present invention will be described with reference to FIG. 1 and FIG. 2 that shows a state in a minimum gap portion of a pair of rolls in plan view.

  In the twin roll type continuous casting machine 100 according to the first embodiment, a pair of oppositely rotating rolls 101 and 102 are arranged close to each other in parallel at the same height position, and the shafts of the rolls 101 and 102 are arranged. Both ends in the direction are partitioned by side weirs 103 and 104 that are in close contact with the roll end face. Molten steel 106 is supplied through an nozzle 105 to an internal space (bath pool) surrounded by the rolls 101 and 102 and the side weirs 103 and 104.

  In addition, the space | interval (distance of (beta) direction in FIG. 2) in the minimum gap part of the roll 101 arrange | positioned at intervals and the roll 102 is made longer than the space | interval (distance) in the conventional twin roll type continuous casting machine. For example, it is 20 mm.

  Although details will be described later, in this twin roll type continuous casting machine 100, a thick plate slab 107 is drawn from between the rolls 101 and 102 in a state where cold materials R1 and R2 are cast on both sides. Manufactured.

  The twin roll continuous casting machine 100 is provided with a cold material supply device 200 for supplying the cold materials R1 and R2. The cooling materials R1 and R2 are long strips made of an iron-based material, and are preferably made of the same material as the molten steel 106 or a material similar thereto.

  The cold material supply apparatus 200 includes payoff reels 201 and 202, transport rolls 203 and 204, and guide rolls 205 and 206.

  The payoff reel 201 continuously feeds the cold material R1 in synchronization with the drawing speed of the slab 107 (the rotational speed of the rolls 101 and 102). The fed cold material R1 is transported by the transport roll 203 and guided. Guided by the roll 205, the molten steel 106 is continuously supplied from above to below. Similarly, the payoff reel 202 continuously feeds the cold material R2 in synchronization with the drawing speed of the cast slab 107 (rotational speed of the rolls 101 and 102), and the fed cold material R2 is conveyed by the conveyance roll 204. Then, it is guided by the guide roll 206 and continuously supplied from the upper side to the lower side of the molten steel 106.

Moreover, the positions at which the cooling materials R1 and R2 are supplied to the molten metal surface of the molten steel 106 are guided by the guide rolls 205 and 206 and become the following predetermined positions.
As shown in FIG. 2, the “predetermined position” is along the rotational axis of the rolls (rotating members) 101 and 102 on the molten steel 106 supplied between the rolls (rotating members) 101 and 102. These are two positions on both ends with respect to the direction (α direction in FIG. 2) and between both rolls (both rotating members) 101 and 102 (between the roll 101 and the roll 102 in the β direction in FIG. 2).

  A guide plate may be used instead of the guide rolls 205 and 206 as long as the cooling materials R1 and R2 can be supplied to the “predetermined position”.

  When the rolls 101 and 102 rotate, the molten steel 106 is cooled by coming into contact with the surfaces of the rolls 101 and 102 to form solidified shells 111 and 112. The solidified shells 111 and 112 grow as the roll rotates.

  At this time, the molten steel 106 is also brought into contact with the surfaces of the cold material R1 and the cold material R2 that are continuously supplied into the molten steel 106 in synchronization with the roll rotation, whereby the solidified shells 113 and 114 are formed. The solidified shells 113 and 114 grow as the cold materials R1 and R2 progress through the molten steel 106.

  Then, in the minimum gap portion where the gap between the roll 101 and the roll 102 is the smallest, the solidified shell 113 formed so as to surround the surface of the cold material R1 and the surfaces of the rolls 101 and 102 (on the left side in the α direction in FIG. 2) The solidified shells 111 and 112 formed on the surface of the portion are pressed and integrated by the narrow pressure of the rolls 101 and 102. Similarly, the solidified shell 114 formed so as to surround the surface of the cold material R2 and the solidified shells 111 and 112 formed on the surfaces of the rolls 101 and 102 (surfaces on the right side with respect to the α direction in FIG. 2) It is pressed and integrated by the narrow pressure of 101,102.

  At this time, the thickness along the β direction of the cooling materials R1 and R2 is set to a thickness that enables the solidified shells 111 and 112 and the solidified shells 113 and 114 to be joined at the minimum gap portion. That is, the thicknesses of the cooling materials R1 and R2 are defined so that the solidified shells 111 and 112 and the solidified shells 113 and 114 are joined at the minimum gap in accordance with the interval (distance) between the rolls 101 and 102. is doing.

  As a result, both ends of the solidified shell 111 and the solidified shell 112 are pressed and integrated through the solidified shells 113 and 114, and the solidified shells 111, 112, 113, and 114 leave the molten steel 106 in the central portion. As shown in FIG. 2, a slab 107 is formed by joining in a bag binding shape.

  The slab 107 in a state in which the solidified shells 111, 112, 113, and 114 are pressed in a bag-bound form at the minimum gap portion and the molten steel 106 is left in the center is pulled out of the rolls 101 and 102 and conveyed. The molten steel 106 at the center portion is also solidified by being cooled at this point.

In this embodiment, since the cooling materials R1 and R2 are supplied to both ends of the roll, even if the gap between the roll 101 and the roll 102 is widened, both ends of the solidified shells 111 and 112 are solidified shells 113 and 114. Therefore, the casting can be performed without breakout, and a thick slab 107 can be manufactured.
It is also possible to use a cold material R having a circular cross section as shown in FIG.

  Since the thick cast slab 107 can be manufactured in this way, the production volume can be increased.

  A twin-roll continuous casting machine according to a second embodiment of the present invention will be described with reference to FIG. 4 and FIG. 5 showing a plan view of the state of the pair of rolls at the minimum gap portion.

  In the twin roll continuous casting machine 100A according to the second embodiment, the distance (the distance in the β direction in FIG. 5) at the minimum gap portion between the roll 101 and the roll 102 is the distance in the twin roll continuous casting machine 100 of the first embodiment. The distance is longer than (distance), for example, 30 mm. Furthermore, the cooling material supply apparatus 200A supplies the cooling materials R1a, R1b, R1c, R2a, R2b, and R2c. Since the other parts are the same as those in the first embodiment, the same parts are denoted by the same reference numerals, and redundant description will be omitted, and different parts will be mainly described.

  The cold material supply apparatus 200A includes payoff reels 201a, 201b, 201c, 202a, 202b, 202c, transport rolls 203a, 203b, 203c, 204a, 204b, 204c, and guide rolls 205a, 205b, 205c, 206a, 206b, 206c. have.

The payoff reels 201a to 201c continuously feed out the cold materials R1a to R1c in synchronization with the drawing speed of the slab 107 (the rotational speed of the rolls 101 and 102), and the fed cold materials R1a to R1c are transport rolls. The three cold materials R1a to R1c are tightly tightened and guided by the guide roll 205, and are continuously supplied from the upper surface to the lower surface of the molten steel 106.
Similarly, the payoff reels 202a to 202c continuously feed the cold materials R2a to R2c in synchronism with the drawing speed of the slab 107 (rotational speed of the rolls 101 and 102), and the fed cold materials R2a to R2c are The three cold materials R2a to R2c are tightly tightened and guided by the guide roll 206, and are continuously supplied from the upper side to the lower side of the molten steel 106. Is done.

As shown in FIG. 5, the positions at which the cold materials R1a to R1c and R2a to R2c are supplied to the molten steel 106 are as follows. In the molten steel 106 supplied between the rolls (rotating members) 101 and 102, The rolls (rotating members) 101 and 102 are positioned at both ends with respect to the direction along the rotation axis (α direction in FIG. 5) and between both rolls (both rotating members) 101 and 102 (in FIG. 5, the roll 101 with respect to the β direction). And between the rolls 102).

  Similarly to the first embodiment, the second embodiment is also formed so as to surround the surfaces of the three cold materials R1a to R1c that are in close contact with each other at the smallest gap portion where the gap between the roll 101 and the roll 102 is the smallest. The solidified shell 113 and the solidified shells 111 and 112 formed on the surfaces of the rolls 101 and 102 (the surface of the left portion with respect to the α direction in FIG. 5) are pressed and integrated by the narrow pressure of the rolls 101 and 102. Similarly, it is formed on the surface of the solidified shell 114 formed so as to surround the surfaces of the three cold materials R2a to R2c that are in close contact with each other, and the surfaces of the rolls 101 and 102 (the surface of the right portion with respect to the α direction in FIG. 5). The solidified shells 111 and 112 are pressed and integrated by the narrow pressure of the rolls 101 and 102.

  As a result, both ends of the solidified shell 111 and the solidified shell 112 are pressed and integrated through the solidified shells 113 and 114, and the solidified shells 111, 112, 113, and 114 leave the molten steel 106 in the central portion. As shown in FIG. 5, a slab 107 is formed by joining in a bag binding shape.

  The slab 107 in a state in which the solidified shells 111, 112, 113, and 114 are pressed in a bag-bound form at the minimum gap portion and the molten steel 106 is left in the center is pulled out of the rolls 101 and 102 and conveyed. The molten steel 106 at the center portion is also solidified by being cooled at this point.

  In the present embodiment, since the cooling materials R1a to R1c and R2a to R2c are supplied to both ends of the roll, the solidified shell 111, even if the distance between the roll 101 and the roll 102 is made wider than that of the first embodiment. Since both end portions of 112 are pressed and integrated through the solidified shells 113 and 114, casting can be performed without breakout, and a thick slab 107 (for example, 30 mm) can be manufactured.

  Since the thick cast slab 107 can be manufactured in this way, the production volume can be increased.

  If the number of inserted cold materials is further increased, the roll interval can be further increased, and a thicker slab can be manufactured.

In Examples 1 and 2 described above, the present invention is applied to a twin roll type continuous casting machine. However, a belt type continuous casting machine, that is, a molten steel is supplied between a pair of circulatingly rotating belts to produce a slab. The present invention can also be applied to a type of continuous casting machine.
That is, according to the present invention, molten steel is supplied between a pair of synchronously rotating rotating members arranged at intervals, and a slab formed by press-contacting a solidified shell solidified on the surface of each rotating member is formed between the rotating members. It can be applied to a synchronous continuous casting machine drawn out from

The perspective view which shows the twin roll type continuous casting machine which concerns on Example 1 of this invention. BRIEF DESCRIPTION OF THE DRAWINGS The block diagram which shows the twin roll type continuous casting machine which concerns on Example 1 of this invention planarly. The block diagram which shows the other example of a cold material. The perspective view which shows the twin roll type continuous casting machine which concerns on Example 2 of this invention. The block diagram which shows planarly the twin roll type continuous casting machine which concerns on Example 2 of this invention. The block diagram which shows the conventional vibration mold. The block diagram which shows the conventional twin roll type | mold casting_mold | template.

Explanation of symbols

100, 100A Twin roll type continuous casting machine 101, 102 Roll 103, 104 Side weir 105 Nozzle 106 Molten steel 107 Cast pieces 111, 112, 113, 114 Solidified shell 200, 200A Cold material supply device 201, 201a-201c, 202a-202c Payoff reels 203, 203a to 203c, 204a to 204c Transport rolls 205, 206 Guide rolls R, R1, R1a to R1c, R2, R2a to R2c

Claims (5)

Synchronous continuous supply of molten steel between a pair of synchronously rotating rotating members arranged at intervals, and pulling out a slab formed by pressing a solidified shell solidified on the surface of each rotating member from the gap between the rotating members In the casting machine,
In the molten steel surface supplied between the rotating members, a length made of an iron-based material is provided at two positions on both ends with respect to the direction along the rotational axis of the rotating member and between the rotating members. A cooling material supply device that continuously supplies the cold material of the scale in a synchronized manner with the drawing speed of the slab and from the upper surface of the molten metal surface downward while being spaced from the rotating member Synchronous continuous casting machine. In claim 1,
The synchronous material continuous casting machine, wherein the cold material supply device bundles and supplies a plurality of the cold materials to the two positions. In claim 1 or claim 2,
With respect to the direction from one rotating member to the other rotating member, the thickness of the cold material supplied to the two positions is the minimum cap portion where the distance between the pair of rotating members is the smallest. A synchronous continuous casting machine characterized in that the thickness is such that the solidified shell solidified and grown on the surface of the member and the solidified shell solidified and grown on the surface of the cold material can be joined . In any one of Claims 1 thru | or 3,
The cold material supply device includes a payoff reel for feeding the cold material, and guide means for guiding the cold material to be fed toward the two positions. . In any one of Claims 1 thru | or 4,
2. The synchronous continuous casting machine according to claim 1, wherein the rotating member is a roll or a belt that circulates and rotates.

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