JPS5992103A - Rolling method of hot strip - Google Patents

Abstract

PURPOSE:To roll a slab having a large single weight and to obtain the effect similar to the effect obtainable with full continuous rolling by noncontinuous rolling by bisecting a rolling stage of a continuously cast slab to fore and post stages and winding and rewinding a sheet bar which is an intermediate product to an up end state. CONSTITUTION:A slab S1 which is cast continuously with a rolling device A in a fore stage is formed with a high draft rolling mill 2A and a rolling mill 3A with shape adjustment to a sheet bar S2 which is wound to an up end state, thereby forming an up end sheet bar coil SC1. The coil SC1 is unwound in the state of the up end state with a rolling device B in a post stage and is formed with a finishing mill group 2B and a cooler 3B to a hot strip S3, which is taken up to a hot coil SC2 having a standard size. The slab S1 in this case is cast continuously with a known continuous casting machine 1A and is supplied as it is to the mill 2A but the slab S1 cast with the machine 1A has about 200mm. thickness and is rolled to about 30mm. thickness by the mill 2A.

Description

[Detailed Description of the Invention] The present invention is based on Holatos IJ Tsubu's "E rolling method. More specifically, it rolls a large unit weight slab and rolls it completely continuously [equivalent to E rolling method]. It is intended to be obtained by discontinuous rolling.

Conventionally, hot strip is generally produced by reheating a slab (approximately 250 mm thick) made by continuous casting or blooming into a heating furnace, and passing it through a rough rolling mill and a finishing cE rolling mill. .

In this way, the hot strip rolling production method described above requires the slab to be reheated in a heating furnace.
Due to the worsening fuel consumption and the need to carry slabs horizontally in various places such as slab yards and heating furnaces, long slabs with large unit weights (e.g. x5rIL or more) are difficult to handle due to rFJ: hl# J : It is extremely difficult to roll large unit weight slabs in terms of equipment, and furthermore, since rolling is performed in units of 9 degree x rubs of up to 20 to 30 tons, it is difficult to roll large unit weight slabs. If the coil continues, unsteady parts will occur at the leading and trailing ends of the product, resulting in problems such as being extremely disadvantageous in terms of quality and yield.

As a means of solving these problems, Horatos) I
A method of forming J-tube by completely continuous rolling has also been proposed.

0 Since it is directly rolled and formed by continuous & JJ manufacturing machines, the fuel consumption rate is improved.

0 In discontinuous rolling, each rolling mill is
In order to ensure smooth engagement between the upper and lower rolls of the rolling mill group and finish rolling mill group, the tip shape and plate thickness of each rolled material must be adjusted, but in the case of completely continuous rolling, , there is no need for that at all.

0 In discontinuous rolling, the temperature at the leading and trailing ends of each rolled material decreases, which causes the disadvantage that the quality of the formed product becomes uneven, but in completely continuous rolling, such disadvantages can be avoided. does not occur.

0 In discontinuous rolling, there is inevitably a temporal and mechanical space between the preceding rolled material and the following rolled material, in which no rolling work is performed.
, the effective utilization of hexavalent equipment is lowered and the productivity is also poor, whereas completely continuous rolling does not cause such disadvantages.

There are many benefits.

In this way, completely continuous [E-rolling] can overcome the disadvantages of conventional discontinuous rolling, but because the rolling speed and capacity of one continuous casting machine are low, It is difficult to implement a large-scale process, and there are many technical problems outside of each component that cannot be solved by simply scaling up the corresponding part in the past, so there are currently many technical difficulties in implementation. There is.

By the way, when considering the current hot slip 'M fJi process, the following points are noteworthy.

In steel manufacturing, one charge (10
Looking at the order structure of hot strip, many lots of the same width and thickness are drawn in units of 50 to 100 tons on average.

From this, by making continuous rolling of at most 1 charge 1Ii (I't) possible, even if it is discontinuous rolling, it is possible to obtain the same effect as completely continuous rolling.

In view of the above, the present invention provides 4-4 improvements to the conventional example described above.
This was devised in order to solve the problems and inconveniences caused by rolling, and the rolling process was divided into two stages: a front-stage rolling process and a second-stage rolling process, and the intermediate product sheet bar was wound and unrolled in an up-end state. It is something.

Hereinafter, the implementation side of the present invention will be explained with reference to the drawings.

In the present invention, a continuously cast slab S1 is formed into a sheet bar S by a pre-rolling device A through a two-person large reduction rolling mill and a shape adjustment rolling mill 3A, and the sheet bar S is brought into an up-end state. Wind it up and form it into an up-end sheet bar coil SO□.

Next, this 7゛ tube end sheet bar coil SO is unwound in the up-end state by a rear rolling device B, and is formed into a hot strip S through a finishing rolling mill group 2B and a cooling device 3B. , the fixed size of the hot coil SO.

Wind it up.

The slab S, is continuously cast by a well-known continuous casting machine IA, and is supplied as it is to two large reduction rolling mills, but the slab S, cast by this continuous casting machine IA, is approximately 2oo (
The thickness is about 30 mm), and the thickness is about 30
It is rolled to a thickness of about [am].

The sheet bar S, tJ, which was rolled and formed to a thickness of about 30 mm by two people on this large reduction rolling mill, shape adjustment rolling mill 3
After the shape is corrected by A, it is wound up by the winding machine 6A and formed into an up-end sheet bar coil SO1.
In order to wind up in the up-end state, the sheet bar S is placed in a horizontal position on the entrance side of the winder 6A! A first posture correcting device 7A consisting of a number of rollers and guides is provided to correct the posture of the subject to an upright posture.

The up-end sheet bar coil SO8 formed by the up-end rolling device WA is unwound in its up-end state and formed into a hot strip S by the subsequent rolling device B. Sheet Par S, which was rewound in its original state,
After being corrected to a horizontal and lateral posture by the second posture correcting device IB, which has exactly the same configuration as the first posture correcting bag γt7A described above, the plate is rolled to a desired thickness by the finishing rolling mill group 2B, and is then placed in a cooling device. After the material is adjusted by 3B, it is formed into a hot strip S, which is then cut into required lengths by a running shear 4B, wound around a coiler, and formed into a hot strip coil SC1.

In this way, the present invention can be achieved by using the first rolling device A.13. The sheet bar S formed into the up-end sheet bar coil BOX is then rewound in the up-end state by the post-rolling device B and formed into a hot strip S3. However, since the rolling process is to form an up-end sheet bar coil SO8, it is divided into a front-stage rolling process and a second-stage rolling process.

As a result, there is a risk of inconvenience caused by uneven cooling of the front and rear ends of the sheet bar S in the conventional discontinuous rolling described above, so the formed up-end sheet bar coil SO1 is , it is desirable to accommodate the heat retaining chamber 5A.

However, as in the illustrated embodiment, a running shear 4A is provided to remove unsteady parts of the sheet par S, that is, abnormally low temperature parts, parts where the temperature has decreased at the start or end of casting, and parts where many inclusions are worn out. When adjusting the unit weight of the up-end sheet bar coil sc1, which is formed by dividing the sheet par S into a certain length by dividing the sheet par S, into a certain length, it is necessary to Since the thermal effect is exerted, this heat retention chamber 5A is not particularly required when the formed up-end sheet bar coil SO is immediately rolled and formed by the subsequent rolling device B.

In addition, compared to the production capacity of one up-end sheet bar coil SO2 by the front rolling equipment A, which consists of a continuous caster IA, two Ota lower rolling mills, a shape adjustment rolling mill 3A, etc., one up-end sheet bar coil SO8 Since the manufacturing capacity of the rear rolling mill B, which consists of the finishing rolling mill group 2B and the cooling device 3B, etc. that form the hot strip S3 into the hot strip S3, is clearly larger, the actual operation is carried out using one rear rolling mill as in the illustrated embodiment. For apparatus B, a plurality of front rolling apparatuses A that match the processing capacity of the latter rolling apparatus B are combined, and the plurality of front rolling apparatuses A are used to hot strip one up-end sheet bar coil 801 of the latter rolling apparatus B. It is effective to sequentially operate the mills S and S by the time required for rolling and forming, thereby allowing the subsequent rolling mill M to be operated continuously.

In this way, when a plurality of front rolling units A and one rear rolling unit aB are used in combination, the heat retention chamber 5 described above is used.
The provision of A is useful for making the rolling operation more effective by the combination of the plurality of front IQIE rolling apparatuses A and one rear rolling apparatus B.

By the way, there are various possible operation modes for the combination of a plurality of front rolling mills ID A and one rear rolling mill B.
In the case of the embodiment shown in FIG. 1, two winding machines 6A having an unwinding function are arranged in the heat retention chamber 5A, corresponding to one front-stage rolling device A, and one winding machine 6A is arranged. When the sheet par 82 is being wound on one winding machine 6A, the amplifier end sheet bar coil SO3, which is being wound on another winding machine 6A, is in the standby state or in the unwinding state. Make it so.

In the case of the embodiment shown in FIG. 1, two front-stage UEs and a rolling machine A are combined with one rear-stage rolling machine B, and two winding machines are combined with one front-stage rolling machine a. Machine 6A is installed.

That is, four winding machines 6A are provided in the heat retention chamber 5A, and the up-end sheet bar coil S01 is wound and unwound on these four winding machines 416A in order. I'm going.

In the state shown in FIG. 1, the up-end sheet bar coil SO3 wound on the first winding +fi6A of the second front rolling device is in the unwinding operation, and the second up-end sheet bar coil SO3 corresponding to the 20011th rolling device A The winding machine 6A is in a state where the sheet bar S is wound up to approximately half.

On the other hand, the second winding i6 of the first pre-rolling device A
The up-end sheet bar coil SO1 is formed in A and is in the ready state, and the first winding machine 6A is
The sheet bar S has started to be wound.

In the case of the embodiment shown in FIG. 2, there is only one front rolling mill i?
This figure shows a case where one winding machine 6A is installed in A, and in this case, the side front rolling device A is the rear rolling device i', f.
Prior to fi B, it is driven to form a 2.3 up end sheet bar coil 801 in advance.

In the case of the embodiment shown in FIG. 2, a winding machine 6A is required.
In addition, there is no need to have a rewinding function, and in addition, both front rolling units A and front rolling unit I
7. There is no particular restriction on the operation timing between A and the subsequent rolling device B, but on the other hand, the timing time of the up-end sheet bar coil SO1 formed in the heat retention chamber 5A becomes longer, and the up-end @1) χ Illustrated example, such as the need to remove the sheet bar coil SC2 from the winder 6A, and the need for a dedicated unwinder 5B that does not unwind the up-end sheet bar fill SO1. There are disadvantages compared to the case of

An example of a long-term combination of the front rolling device A and the rear rolling device 1trJ is a general continuous VI rolling machine IA.
The capacity is approximately 103 tons/1sTRAND day, so there are two front rolling mills compared to rear rolling mill B which has a processing capacity of 203 ta/117 days! It is realistic to combine the &
Since the expected rolling capacity is about 3 tons/l5TRAλ4D days, it is possible to combine one rear rolling unit B using a high-speed rolling mill with a processing capacity of 403 torrZ days with a front IF rolling unit A of 403 torrZ days.

In addition, the arrangement combination of 1) 11 stages [E rolling unit uA and rear rolling unit Gff B in the illustrated embodiment in FIG.
Compared to human production capacity, which is suitable for slightly low production,
Fig. 2 Front-stage rolling equipment A and rear-stage rolling equipment fit in the illustrated embodiment
The arrangement combination with B is up-end sheet bar coil S
Since there can be any number of a, it is suitable for large-scale production.

The present invention can take various embodiments as described above, but regardless of which embodiment it is implemented, the molded seat bar S is an up-end seat bar coil SO.
It needs to be molded into 1.

A winding machine 6 that winds this sheet bar S into an up-end state and forms it into an up-end sheet bar coil SO1
An example of the structure of A is shown in FIG.

The winding machine 6A has a turntable 6A rotatably assembled to a support base 6A fixed immovably, and a mandrel 6A at the center of the upper surface of the turntable 6A.

is erected to constitute the main body portion of the winding machine 6A, and the mandrel 6A is opposite to the mandrel 6A from the side.
Is the winding of the sheet bar S, accurate and circular? :') is provided with a guide mechanism 6A to achieve this.

The guide mechanism 6A connects the sheet bar S, which has been introduced to be wound around the mandrel 6A, to the mandrel 6A.

It has a large number of guide rolls 6A that press against the mandrel 6A, and a plate 6A that guides the introduced sheet bar S in the direction in which it is wound around the mandrel 6A. , each guide roll 6A, as in the illustrated embodiment,
A force is applied to the mandrel 6A while holding a certain force (M) by the cylinder 6A8, etc.

This guide roll 6A6 & the given pressing force is
Seat bar S is wrapped around mandrel 6A. /J, and this pressing force causes the sheet bar S to be wound onto the mandrel 5A! Since there are no gaps and no JIJ frictional displacement occurs between the stacked surfaces, there is no risk of scratches on the surface of the seat bar S.

This guide mechanism 6A is required when winding up the sheet bar S, and when not in winding operation, each guide roll 6A and guide plate 6A.

is in the reverse position at the reverse limit.

The winding machine 6A used in the embodiment shown in FIG.
Since it is necessary to also have a rewinding function, the turntable 6At, mandrel 6A, and support stand 6A are
shall be installed to allow free rotation.

On the other hand, the winding fi6h used in the embodiment shown in FIG.
It is necessary to remove it from 36A.

For this purpose, for example, as shown in the figure, a coil holding plate 6A4 in the shape of a flat disk is detachably provided on the turntable 6At, and the mandrel 6A is configured to be lowered and stored inside the support base 6A, and the coil holding plate 6A4 is configured to be able to be lowered and stored within the support base 6A. After up-end sheet bar coil somt type by machine 6A, mandrel 6A
, and then turn the winder 6A with the Atsubue > F sheet bar coil SC1 placed on the coil holding plate 6A4.
It is convenient to be able to separate from the

In this way, the present invention winds the seat bar s2 in an up-end state and forms it into the up-end sheet bar coil S01, so this up-end seat bar coil SO
Even if the coil S01 has a large unit weight, there is no possibility that the coil S01 will be crushed or scratched.

Also, as mentioned above, up-end seed per coil SO
, can be made to have a large unit weight, so the rear opening E rolling device B
Now, this large unit weight coil SO, is continuously rolled by EE, thereby improving the quality of the strip, improving the yield, and improving production efficiency.

Furthermore, it is possible to match the production capacity of the sheet bar S using the continuous casting machine IA with the capacity to form the formed sheet bar S2 into the hot strip S, so that each rolling machine and various other The equipment for hot strip S and molding can be operated continuously without any waiting time, and thus expensive equipment can be used effectively.

As is clear from the above description, the present invention allows the coil ST to have a large unit weight, thereby improving the quality of the hot strip, improving yield and production efficiency, and The expensive equipment required to produce hot strip can be efficiently operated and furthermore, it can be continuously formed into large unit weight coil SO3 from a continuous casting machine.
It is possible to obtain effects equivalent to those obtained by completely continuous rolling, such as improved fuel consumption.

[Brief explanation of drawings]

FIG. 1 is an arrangement diagram of equipment showing one embodiment of the method of the present invention. FIG. 2 is an arrangement diagram of equipment showing another embodiment of the method of the present invention. FIG. 3 is a perspective view showing a specific configuration example of the winding machine together with the posture correction device a. Explanation of symbols A: Front rolling device B: Post rolling device IA: Continuous casting machine Two-person two-large reduction rolling mill 3A: Shape adjustment rolling mill 4
A: Running shaft 5A: Heat retention chamber 6A Two-winder 7A: First posture correction device 1B: Second posture correction device 2
B: Finish rolling mill group 3B: Cooling device 4B: Running shaft
Sl Nislab S, Rainbow Dopa-8, Two Hot Strip SO, Near Tube End Sheet Bar Coil SO,:
Hot strip coil inventor Takashi Jinfuji
Heir Inventor: Hidehiko Shima Inventor: Toshi Taki Male Applicant: Kawasaki Steel Co., Ltd. Representative Hiroshi Yagi

Claims (2)

[Claims] (1) The continuously cast slab is formed into a sheet bar through a large "E lower rolling mill and a shape W1'! shape rolling mill by the front rolling device, and the formed sheet bar is rolled as it is.
The up-end sheet bar coil is wound into an up-end sheet bar coil through the posture correcting device a of % I, and then finished rolling after being unwound and passed through the second posture correcting device +rt by the post-rolling device. A hot strip rolling method in which the hot strip is wound into a hot coil through a group of machines and a cooling device. (2) A plurality of front rolling devices are provided in parallel for one rear rolling device according to the processing capacity of the latter rolling device, and the plurality of front rolling devices are connected to the rear stage 1-1: rolling device. i?
The method for rolling pot strips according to claim B(1), wherein the pot strips are continuously driven in sequence at fixed time intervals determined according to the processing capacity of #.