JPH0446606A - Method and equipment for continuous hot rolling and method and device for joining slab - Google Patents

Abstract

PURPOSE:To join base stock to be rolled in a short time by thinning working the desired place of slab which is manufactured by continuous casting in a continuous hot rolling equipment, cutting the thinned part of slab and joining adjacent cut slabs each other. CONSTITUTION:A slab 21 which is manufactured with a continuous casting machine 1 is thinning worked at a desired place and this thinned part is cut. And, the cut thinned parts of the adjacent slabs 21 are joined each other. That is, because the thickness of the part to be cut is decreased by thinning work, time required for gas cutting is shortened. And, this gas cut face becomes a joined face for later continuation and, because comparatively good face is obtained as it is cut by gas, joining is easy. Further, because the area of the joined face 19 is decreased, time required for heating at the time of joining is decreased and pressurizing force required for pressing to stick can be drastically reduced.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to hot rolling of slab materials manufactured by continuous casting, and particularly relates to continuous hot rolling in which continuous casting and hot rolling steps are performed continuously. The present invention relates to an inter-rolling method and equipment, and a method and equipment for joining slab materials in continuous hot rolling equipment.

[Conventional technology]

In the conventional continuous rolling method, as disclosed in Japanese Unexamined Patent Publication No. 59-130603, the rear end of the preceding rolled material and the trailing material are The rolled material was made continuous by reducing the thickness of the leading end of the rolled material using a press and then joining both ends.

[Problem to be solved by the invention]

The above-mentioned conventional technology does not take into consideration troubles that may occur during the rolling process after the thickness of the rolled material is reduced using a press tool, and the following problems arise.

In other words, the temperature of the reduced thickness part after one year of rolling, which has been reduced by the press tool, has decreased, and this will damage the roll surface of the rolling mill in the next step.

The thickness of the reduced thickness part of the rolled material is greatly reduced compared to other parts, and when that part is bitten by the rolling mill, the speed of the following rolled material increases significantly. Therefore, if this thinned part exists in the rolling machine and the rolling machine behind it cannot follow the sudden speed change, excessive tension will be applied to the rolled material and the rolled material will break, or this tension will cause the rolled material to break. There was a problem in that excessive force was applied, causing problems such as roll damage.

In addition, since the rear end of the leading rolled material and the leading end of the trailing rolled material are free ends, the pressing with the press tool creates unevenness on the end surfaces of both ends, and it is difficult to join these short surfaces together. However, there was also the problem that they could not be joined well.

Furthermore, it takes too much time to press the ends of the rolled material and to join the ends of the rolled material, resulting in a large temperature drop in the entire rolled material, and in order to carry out continuous operation, a large-capacity looper is required. There was also the problem that .

The first object of the present invention is to provide a method and apparatus for joining rolled materials in a short time in continuous hot rolling equipment that joins and hot-rolls rolled materials produced by continuous casting layers. It's about doing.

A second object of the invention is to provide a highly productive continuous hot rolling method and its equipment, including the above-described method for joining rolled materials, which enables joining of rolled materials in a short time.

[Means to solve the problem]

In the first invention, in order to achieve the above object, a desired part of a slab material manufactured by continuous casting in a continuous hot rolling facility is processed to reduce the thickness, the thinned part of the slab material is cut, and the cutting process is performed. The thinned portions of adjacent slab materials are joined to each other.

Further, in a continuous hot rolling facility that sequentially joins and hot-rolls slab materials manufactured by a continuous casting machine, a press means for thinning a desired portion of the slab material is provided on the exit side of the continuous casting machine. , a cutting means for cutting the thinned portion of the slab material, and a joining means for joining the thinned portions of the cut adjacent slab materials.

In the second invention, in order to achieve the above object, a slab material manufactured by continuous casting is subjected to a thinning process at a desired location in a continuous hot rolling facility, the thinned portion of the slab material is cut, and the thinned portion of the slab material is cut. The thinned portions of adjacent cut slab materials are joined to each other, and the joined slab materials are hot rolled.

Further, in a continuous hot rolling facility that sequentially joins and hot-rolls slab materials manufactured by a continuous casting machine, a press means for thinning a desired portion of the slab material is provided on the exit side of the continuous casting machine. , further comprising: a cutting means for cutting the thinned portion of the slab material; and a joining means for joining the thinned portion of the cut adjacent slab material; It is equipped with a heating means for heating.

[Effect]

In the above-mentioned first invention, a desired portion of a slab material manufactured by continuous casting in a continuous hot rolling facility is subjected to a thinning process, and this thinned portion is cut. Then, the thinned parts of the cut adjacent slab materials are joined together. In other words, since the thickness of the part to be cut is reduced by the thinning process, the time required for gas cutting is shortened. This gas-cut surface becomes a joining surface for later continuity, but it is possible to obtain a relatively good surface as it is after gas-cutting, making joining easier. Furthermore, since the area of the bonding surface is reduced, the time required for heating during bonding can be significantly reduced, and the pressing force required for crimping can also be significantly reduced, so that bonding can be completed in a short time.

Further, in the second invention, in the continuous hot rolling equipment, a desired portion of the slab material manufactured by the continuous casting layer is subjected to a thinning process, the thinned portion of the slab material is cut, and the thinned portion of the slab material is cut. The thinned portions of the slab material are joined together. This joined slab material cannot be stopped because it is continuously hot rolled, and the slab material before hot rolling is considerably thick, making it impossible to provide a looper.

That is, as described above, since the slab materials can be joined in a short time, the speed of the entire hot rolling equipment can be maintained at a high speed, and continuous hot rolling with high productivity can be performed.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 5.

FIG. 1 shows a continuous hot rolling facility to which the present invention is applied, and is composed of a continuous casting line L1 and a hot rolling line L2.

Usually, the rolled material produced by the continuous casting machine 1 is divided into lengths of about 10 m by a gas dividing machine. In the present invention, before this gas division, the thickness of the division part is reduced by the press device 2. After this reduced thickness portion is divided by the gas divider 3, it is supplied to the combustion furnace 5. Due to this thickness reduction, the thickness of the dividing part that performs gas division is reduced, so the time required for gas cutting is shortened, and this gas division surface becomes a joint surface for continuity in the later process. Since a relatively good surface can be obtained as it is after gas cutting, the bonding work in the subsequent process is also facilitated.

Alternatively, a high-temperature rolled material produced by another continuous casting machine may be reduced in thickness at the ends to a rolled material having a thickness of about 10 m and then supplied to the heating furnace 5.

FIG. 6 shows the structure of the press device 2 that reduces the thickness of this rolled material and the gas splitter 3 that cuts the rolled material.

Since the rolled material 21 manufactured by the continuous casting machine 1 is manufactured substantially continuously, the aforementioned thickness reduction work and division work must also be performed following the traveling movement of the rolled material 21.

In other words, the press device 2 has a structure in which the press tool 23 is pressed by the hydraulic cylinder 24 into a housing described in a movable cart 30 which is configured to move by the cylinder 25. and.

The shape of the press tool 23 is such that it has a parallel part that is approximately parallel to the longitudinal direction of the rolled material, so that it is convenient for dividing or joining in later steps.
It has an inclined part which is inclined with respect to this parallel part.

On the other hand, in the gas splitter 3, the cutting torch 26 is connected to the rolled material 21.
It has a structure in which it can move in the width direction, and the entire body is moved by a cylinder 27.

The rolled material 21 divided in this manner is sent to the heating furnace 5, where it is uniformly heated and then supplied to the hot rolling line L2.

The rolled material heated to 1200 to 1300°C in the heating furnace 5 is joined by a joining device 6, and then passed through the subsequent rough rolling mill group 7 to
9. A hot steel strip is subjected to a predetermined rolling reduction by a finishing mill group 10, cooled by a cooling device 11, divided into appropriate lengths by a running cutter 12, and wound by a winder 13. taken.

Here, as a specific example of the joining device 6, there may be mentioned a butting method or a stacking method.

As shown in FIG. 10, in the butt type, the joint surfaces of the leading rolled material 14 and the trailing rolled material 15 are opposed to each other with a gap, and a solvent torch 18 with a jet flow diameter larger than this gap g is used. The rolled material is fed laterally along the joint surface, and after the joint surface is treated with a solvent, the rolled material is pressed and joined.

That is, in FIG. 1, 14 is a leading rolled material, 15 is a trailing rolled material, and the leading rolled material 14 and the trailing rolled material 15 are supported on table rollers 17 and conveyed, and are stopped at a desired position. Ru. Two sets of pinch rollers 16 are installed adjacent to the rear end of the preceding rolled material 14 and the tip of the trailing rolled material 15.

The pinch rollers 16 sandwich the preceding rolled material 14 and the trailing rolled material 15, and maintain a predetermined gap g between the end surfaces of the two.
The function is to fix the relative position of both rolled materials 14° 15 so as to ensure that the distance between both rolled materials 14 and 15 is
．． 15 relative to each other and apply a pressing force between both end faces.

A large number of solvent torches 6 are arranged at a predetermined height position above the rolled material 14, 15 at predetermined intervals in the width direction of the rolled material,
These solvent torches 18 are fixed to a frame 40 by clamps 41. The frame 40 is connected to the crank shirts 1 to 43 via a connecting bar 42, the crankshaft 43 is rotatably supported by a bearing 44, and the crankshaft 43 is rotatably supported by a motor 4.
It is connected to 5. When the motor 45 rotates, the crankshaft 43 causes the frame to reciprocate in the width direction of the rolled material, and correspondingly, the many solvent torches 18 also reciprocate.

Further, the solvent torch 18 is connected to an oxygen cylinder 48 and an acetylene cylinder 49 through hoses 46 and 47, respectively, and oxygen and acetylene are gasified and supplied to these cylinders. Each of the solvent torches 18 has a fine iron powder feeding pipe 49, and this powder feeding pipe 49 is connected via a hose 50 to a powder feeder 51 containing fine iron powder and an air or nitrogen cylinder 52. Fine iron powder is supplied to the solvent torch 18 by gasifying air or nitrogen from the cylinder 52 and passing it through the powder feeder 51 .

With the above-described device, both end faces of the rear end of the preceding rolled material 14 and the leading end of the trailing rolled material 15 are solvent-treated by the jet streams 52 of the multiple solvent torches 18, so that the entire end face can be joined in a short time. It is possible to obtain a clean joint surface by applying a solvent to an appropriate state, and to achieve a homogeneous and highly accurate joint with a small pressing force, it is possible to obtain a high-strength joint.

On the other hand, as shown in Fig. 11, the superposition method
The rear end of the preceding rolled material 14 and the trailing rolled material 15
A reactive fluid medium having a stronger oxidizing power than oxygen is sprayed onto the surface joint surface 19, and the joint surface of the rolled material is held at a desired interval along the vertical direction. The temperature of the joining surfaces is raised to near the melting point through reaction, and the leading and trailing ends of the rolled materials are brought into an overlapping state, and the joining surfaces are pressed together to join.

In other words, the bogie running rail 61 is laid extending along the direction of movement of the rolled material. A truck 63 is movably provided on the truck running rail 61, and the housing 34 is placed on the truck 63. The housing 34 is provided with a first pinch roller 32 that pinches the rear end of the preceding rolled material 14, and a second pinch roller 31 that pinches the tip of the trailing rolled material 15. The first pinch roller 32 has a structure that can increase the temperature.
The rear end of the preceding rolled material 14 and the trailing rolled material 15
A desired spacing can be maintained in the vertical direction between the front end and the tip. Furthermore, a press member 33 that presses the preceding rolled material 14 and the following rolled material 15 is provided, and a nozzle header 60 that sprays high-pressure gas onto the joint surfaces of the preceding rolled material 14 and the trailing rolled material 15. This nozzle head 60 is connected to the lifting device 20 via an arm 62.
It has a structure that allows it to be raised and lowered.

The preceding rolled material 14 is fed over table rollers 53 and pinch rollers 31 . It passes through the pinch roller 32 and is sent onto the table roller 54. When the rear end of the preceding rolled material 14 reaches the press position, the rolled material 14 is held between the pinch rollers 32 and
2 rises, and the rear end of the rolled material 14 is lifted upward and held.

On the other hand, the following rolled material 15 is sent onto the table roller 5 and passes through the pinch roller 31. Then, when the leading end of the rolling material 15 that follows reaches the press position, the rolling material 14 is pinched by the pinch rollers 31.

In this way, the rear end of the preceding rolled material 14 and the leading end of the trailing rolled material 15 are held at a desired distance along the vertical direction, and the preceding rolled material 14 is
A reactive fluid medium with the metal member, which has a stronger oxidizing power than oxygen, is sprayed onto the joint surface 19 of the rolling material 15 and the joint surface 19 of the rolling material 15 that follows.

Then, the joint surface 19 of the rolled material 14, 15 reacts with the reactive fluid medium, and the temperature of the joint surface 19 increases to near the melting point of the metal member. At the same time, the rolled material 14
．． The reactive products formed on the joint surface 19 of 15 are wiped off by spraying the reactive fluid medium. and,
When the front and rear ends of the metal members are placed in an overlapping state and the surface joining surfaces 19 are pressed, the joining surfaces are in a molten state, so that the pressure bonding can be reliably performed.

Further, one cart 63 is moved in the direction of movement of the metal member by the cylinder 59 while the rear end of the preceding rolled material 14 and the leading end of the trailing rolled material 15 are held at a desired interval along the vertical direction. .

In other words, the leading rolled material 14 and the trailing rolled material 15
While moving the rolled material 14.15 in the direction of movement,
The mating surfaces of the rolled materials 14 and 15 are pressed together and joined. As a result, the time during which the rolled material 14, 15 and the table rollers 53, 54, 55° 56 are in contact with each other is short, and skin marks can be prevented from forming on the surface of the metal member. At this time, as the cart 63 moves, the table rollers 54 and 55 that interfere with the cart 63
The table 57 is configured to be retractable into a pit 64 provided below the table roller 55.

Figure 2 shows continuous casting machine 1 in the continuous hot rolling equipment in Figure 1.
This is an embodiment in which a continuous casting line L1 and a hot rolling line L2 are arranged on the same line.

The rolled material manufactured by the continuous casting machine 1 is reduced in thickness by the press device 2 at desired intervals (usually about 10 m) as described above, and after the thinned parts are divided by the gas divider 3, it is uniformly divided in the heating furnace 5. is heated to. Then, the rolled material leaving the heating furnace 5 is joined with the adjacent rolled material and its reduced thickness by the joining device 6, and is supplied to the subsequent hot rolling process, thereby making the hot rolling continuous. Realized.

FIG. 3 shows a process in which the rolled material manufactured by the continuous casting machine 1 is cut at desired intervals in advance and is kept waiting in the heating furnace 4, and the rolled material is supplied to the hot rolling line L2 as appropriate. This continuous hot rolling equipment has a process of cutting the rolled material produced at the location at desired intervals, keeping it on standby in a heating furnace, and supplying the rolled material to the hot rolling line L2 as appropriate. In this heating furnace 4, the temperature is 600° C., which is not a problem in the subsequent thickness reduction process of the rolled material.
It is sufficient if the temperature is maintained at about 1000°C.

The rolled material supplied to this hot rolling line L2 has its end portions reduced in thickness by a press device 2, and then uniformly heated in a heating furnace 5, after which the reduced thickness portions of adjacent rolled materials are joined together. They are joined by the device 6 and then proceed to the subsequent hot rolling process.

Here, the process of reducing the thickness of the end portion of the rolled material, which has been previously cut at desired intervals using the press device 2, will be described with reference to FIG.

The thickness is reduced by the press tool 23 while the rear end of the preceding rolled material 14 and the tip end of the rolled material 15 adjacent to this rolled material are butted against each other. In other words, since the thickness is reduced while the surfaces F2 of the ends of adjacent rolled materials are butted against each other, the end surfaces are mutually restrained, so the flatness of the end surfaces can be maintained, making subsequent joining very easy. It has the advantage of being

Further, in addition to the method of reducing the thickness of the end portions described above, the thickness of the end portions of each rolled material may be reduced using the press tool 28.

Note that the process of reducing the thickness of the rolled material using this press device 2 is as follows:
It is not necessary to run the press device 2, and a fixed type may be used.

FIG. 4 is a configuration diagram of a continuous hot rolling facility comprising a continuous casting line L1, a line L3 in which pre-manufactured rolling materials are kept on standby in a heating furnace 4, and a hot rolling line L2.

After the rolled material produced by the continuous casting machine 1 is reduced in thickness by the press W2 at desired intervals, the reduced thickness portions are divided by the gas divider 3 and then held in the heating furnace 5.

In the process, a rolled material manufactured on a separate line and cut at desired intervals is placed on standby in the heating furnace 4, and the ends of this rolled material are butted as described above. , and held in a heating furnace 5.

Then, the rolled material supplied from the heating furnace 5 to the hot rolling line L2 is joined with the adjacent rolled material and their reduced thickness parts by the joining device 6, and the subsequent rough rolling mill groups 7 to 9. It is subjected to a predetermined reduction by the finishing mill group 10 to become a hot tube steel strip, cooled by a cooling device 11, and then divided into appropriate lengths by a running cutter 12.

It is wound up by a winding machine 13.

FIG. 5 shows the press device 2. The joining device 6 is connected to the rough rolling mill group 7~
9. This continuous hot rolling equipment is placed between the finishing rolling mills 10.

First, the rolled material is produced using a continuous casting machine.

After being rolled to a desired thickness in the rough rolling mill groups 7 to 9, the rear end of this rolled material and the leading end of the subsequent rolled material are butted together and the thickness of both ends is reduced in the press device 2. After the joining device 6 joins the rear end of the preceding rolled material and the leading end of the following rolled material.

It is subjected to a predetermined rolling reduction by the finish rolling mill group 10 to become hot strip steel.

Next, since the action and effect of the press thickness reduction by the press device 2 are as described above, the action of removing this thickness reduction part by rolling by a rolling mill in the process will be explained.

FIG. 8 shows a normal rolling state, and the speed of the rolled material is faster on the exit side than on the input side, and the following relationship holds true.

HE・VE=HD・Vo...(1
) or HD Here, HE is the thickness of the rolled material before rolling, Ha is the thickness of the rolled material after rolling, VE is the entry speed of the rolled material, and Vo is the exit speed of the rolled material.

Both the entrance speed VE and the exit speed Vo do not match the roll circumferential speed VR, and generally VE<VR<VD holds true.

The point where the speed of the rolled material and the circumferential speed of the roll match is the N point within the roll bite, which is called the neutral point.

Using the rolling reduction ratio r (=1-HD/HE), the advance rate fs, and the reverse rate fb, the following relationship holds true for the entrance speed VE and the exit speed VO.

VE=VR(1-f b)-(
3) Vo=VR(1-fs)
(4) In hot rolling where tension is low, the following relationship holds true for approximate points.

f s =0.3 r −(5
)f b=(0,7+0.6)・Δr・・
(6) Here, since the rolling reduction rate changes when the rolling of the joint is started, assuming that the amount is Δr, Equation (5) is obtained.

From formula (6), Δfs=o, 3Δr − (7)Δ
f b=(0,7+0.6)−Δr−(8)
As shown, the forward rate and backward rate change.

For example, r=0.4. If Δr=-0,3, Δfs
=-0.09. Δr=-0,282 and roll circumferential speed V
When R is constant, the inlet velocity increases by 28.2% and the outlet velocity decreases by 9%. Therefore, it is not possible to change the roll circumferential speed and keep the entry speed and exit speed the same as before. In other words, in order to keep the exit speed constant, the roll circumferential speed cannot be increased by 9%, and the entrance speed further increases by 37.2%.

Therefore, the rolled material entering the rolling mill is rapidly accelerated at the joint, so if there is a sudden change in thickness between the rolling mills, such as this joint, the rolling mill in front of the rolling mill accelerates rapidly at the joint. If you have to deal with fluctuations, you will not be able to operate normally.

Therefore, as shown in Fig. 9, after joining, the first rolling mill is used to roll the joint part until the level difference disappears, and the peripheral speed of the rolls is changed to maintain the exit speed, thereby rolling the joint part. Although the speed fluctuation occurs only in front of the joint of the rolled material, it does not interfere with subsequent rolling.

In other words, the amount by which the thickness of the rolled material is reduced by the press device 2 is ΔH
(=Ha Ho') and the thickness of the rolled material after rolling in the first rolling mill is Hl, then the thickness may be reduced according to the relationship ΔH≦H1.

〔Effect of the invention〕

According to the first invention, there is provided a joining method and apparatus that can join slab materials in a short time in continuous hot rolling equipment that joins slab materials manufactured by continuous casting and hot-rolls them. This effect is achieved.

According to the second aspect of the invention, it is possible to join the rolled materials in a short time, so that it is possible to obtain a highly productive continuous hot rolling method and its equipment.

[Brief explanation of the drawing]

FIG. 1 is a layout diagram showing continuous hot rolling equipment which is one embodiment of the present invention, and FIGS. 2 to 5 are layout diagrams each showing continuous hot rolling equipment which is another embodiment of the present invention. , FIG. 6 is a schematic diagram showing the structure of the press device 2 and the gas splitter 3, and FIG.
The figure is an explanatory diagram illustrating a method for reducing the thickness of a rolled material.
FIG. 9 is an explanatory diagram of the speed of the rolled material during rolling; FIG. 9 is an explanatory diagram of the removal of thickness changes in the rolled material;
10 and 11 are schematic views showing one embodiment of the joining device 6, respectively. 1 Continuous casting machine, 2... Press device, 3... Gas splitter, 4... Heating furnace, 5... Heating furnace, 6... Joining device, 7-9... Rough rolling mill group, 10 ... Finishing rolling mill group, 1
DESCRIPTION OF SYMBOLS 1... Cooling device, 12... Inter-travel cutting machine, 13... Winding machine, 14... Leading rolling material, 15... Following rolling material, 18... Solvent torch, 19...・Joint surface, 2
DESCRIPTION OF SYMBOLS 1...Rolled material, 23...Press tool, 26...Cutting torch, 30...Moving trolley, 31.32...Pinch roller. 34...Housing, 53,54,55.56...Table roller, 60...Nozzle header, 62...Arm, 63...Dolly, Ll...Continuous casting line, L
z...Hot rolling line. Figure Figure

Claims (1)

[Claims] 1. A method for joining slab materials in continuous hot rolling equipment, in which slab materials manufactured by continuous casting are joined in the next step. (1) A step of reducing the thickness of a desired part of the slab material, (2) A step of cutting the reduced thickness part of the slab material, (3) A step of cutting the reduced thickness part of the cut adjacent slab material to each other. The process of joining. 2. A continuous hot rolling method in which slab materials manufactured by continuous casting are joined in the next step and hot rolled. (1) A step of reducing the thickness of a desired part of the slab material, (2) A step of cutting the reduced thickness part of the slab material, (3) A step of cutting the reduced thickness part of the cut adjacent slab material to each other. a step of joining; (4) a step of hot rolling the joined slab material; 3. A continuous hot rolling method in which slab materials manufactured by continuous casting are joined in the next step and hot rolled. (1) A step of thinning a desired portion of the slab material. (2) cutting the thinned portion of the slab material; (3) heating the cut slab material; (4) joining the heated adjacent slab materials to each other at the thinned portion. (5) Hot rolling the joined slab material. 4. A method for joining slab materials in a continuous hot rolling facility, in which a slab material manufactured by continuous casting is cut at a desired location, and the cut slab materials are joined in the next step. (1) A step of reducing the thickness of the end portion of the cut slab material; (2) A step of joining the reduced thickness portions of the adjacent slab materials to each other. 5. A continuous hot rolling method in which a slab material manufactured by continuous casting is cut at desired locations, the cut slab materials are joined in the next step, and hot rolled. (1) Processing the ends of the cut slab materials to reduce the thickness; (2) Joining the thinned parts of the adjacent slab materials to each other; (3) Hot-processing the joined slab materials. The process of rolling. 6. A continuous hot rolling method in which a slab material manufactured by continuous casting is cut at desired locations, the cut slab materials are joined in the next step, and hot rolled. (1) Processing the end portions of the cut slab materials to reduce the thickness; (2) heating the end portions of the cut slab materials; (3) bonding the thinned portions of the adjacent slab materials together. a step adjacent to (4) a step of hot rolling the joined slab material. 7. A continuous hot rolling method in which a slab material manufactured by continuous casting is cut at desired locations, and the cut slab material is hot rolled in the next step. (1) Rough rolling the cut slab material, (2) Reducing the thickness of the end portion of the roughly rolled slab material, (3) Rolling the thinned parts of the adjacent slab materials together. a step of joining, (4) a step of finish rolling the joined slab materials. 8. A method for joining slab materials in a continuous hot rolling facility in which high-temperature slab materials are joined in the next step. (1) A step of reducing the thickness of a desired part of the slab material, (2) A step of cutting the reduced thickness part of the slab material, (3) A step of cutting the reduced thickness part of the cut adjacent slab material to each other. The process of joining. 9. A continuous hot rolling method in which high temperature slab materials are joined in the next step and hot rolled. (1) A step of reducing the thickness of a desired part of the slab material, (2) A step of cutting the reduced thickness part of the slab material, (3) A step of cutting the reduced thickness part of the cut adjacent slab material to each other. a step of joining; (4) a step of hot rolling the joined slab material; 10. A continuous hot rolling method in which high-temperature slab materials are joined in the next step and hot rolled. (1) A step of reducing the thickness of a desired part of the slab material, (2) A step of cutting the reduced thickness part of the slab material, (3) A step of heating the cut slab material, (4) The heating (5) a step of hot rolling the joined slab materials; (5) a step of hot rolling the joined slab materials; 11. Joining of slab materials in a continuous hot rolling facility, characterized in that the step of thinning the desired portion of the slab material described in each of claims 1 and 8 is performed while the slab material is running. Method. 12. Continuous heating, characterized in that the step of thinning the desired portion of the slab material described in each of claims 2, 3, 9, and 10 is performed while the slab material is running in a strike direction. Inter-rolling method. 13. A method for joining slab materials in a continuous hot rolling facility, wherein the step of cutting the thinned portion of the slab material described in each of claims 1 and 8 is performed while the slab material is running. . 14. The step of cutting the thinned portion of the slab material described in each of claims 2, 3, 9, and 10 is carried out while the slab material is running in a continuous hot working process. Rolling method. 15. The process of reducing the thickness of the ends of the cut slab materials according to claim 4 is a continuous process characterized in that the process of reducing the thickness of the ends of the cut slab materials is performed with the ends of adjacent slab materials butted against each other. A method for joining slab materials in hot rolling equipment. 16. The step of thinning the ends of the cut slab materials described in each of claims 5, 6, and 7 is performed by thinning the ends of adjacent slab materials in a state where the ends are butted against each other. A continuous hot rolling method characterized by meat processing. 17. In the step of reducing the thickness of a desired portion of the slab material according to claims 2, 3, 5, 6, 9, and 10, the amount of thickness reduction ΔH is , for the rolling reduction H_1 by the first rolling mill in the hot rolling process, Δ
A continuous hot rolling method characterized by thinning processing such that H≦H_1. 18. In the step of reducing the thickness of a desired portion of the slab material according to claim 7, the amount of thickness reduction ΔH is relative to the amount of reduction H_1 rolled by the first rolling mill in the step of finish rolling. ,
A continuous hot rolling method characterized by thinning processing so that the relationship ΔH≦H_1 is satisfied. 19. In a continuous hot rolling facility that sequentially joins slab materials manufactured by a continuous casting machine and hot-rolls them, on the exit side of the continuous casting machine, a press means for thinning a desired portion of the slab material; , A slab material in continuous hot rolling equipment, characterized in that it is provided with a cutting means for cutting the thinned part of the slab material, and a joining means for joining the thinned part of the cut adjacent slab material. joining equipment. 20. In a continuous hot rolling facility that sequentially joins and hot-rolls slab materials produced by a continuous casting machine, on the outlet side of the continuous casting machine, a press means for thinning a desired portion of the slab material; , a cutting means for cutting the thinned portion of the slab material, and a joining means for joining the thinned portion of the cut adjacent slab material, and further, the slab material is placed on the entry side of the joining means. Continuous hot rolling equipment characterized by being provided with heating means for heating. 21. In a continuous hot rolling facility that cuts slab materials produced by a continuous casting machine at desired locations, sequentially joins the slab materials, and performs hot rolling, the end portions of the cut slab materials are thinned. continuous hot rolling equipment, characterized in that it is provided with a press means for joining the thinned parts of the adjacent slab materials; and a joining means for joining the thinned parts of the adjacent slab materials. 22. In a continuous hot rolling facility that cuts slab materials produced by a continuous casting machine at desired locations, sequentially joins the slab materials, and performs hot rolling, the end portions of the cut slab materials are thinned. and a joining means for joining the thinned parts of the adjacent slab materials, further comprising a heating means for heating the slab materials on the entry side of the joining means. Hot rolling equipment. 23. In a continuous hot rolling facility that cuts a slab material produced by a continuous casting machine at a desired location and then hot-rolls the slab material using a rough rolling mill group and a finishing rolling mill group, On the exit side of the final rolling mill, press means for reducing the thickness of the end portion of the rough-rolled slab material, and joining means for joining the reduced thickness portions of the adjacent slab materials are provided, and further, the joining means A continuous hot rolling facility characterized in that a heating means for heating the slab material is provided on the entry side of the continuous hot rolling facility. 24. In a continuous hot rolling facility that sequentially joins high-temperature slab materials and hot-rolls them, on the outlet side of the continuous casting machine, a press means for thinning a desired portion of the slab material; 1. An apparatus for joining slab materials in a continuous hot rolling facility, comprising: a cutting means for cutting the thinned portions of the adjacent slab materials; and a joining means for joining the thinned portions of the cut adjacent slab materials. 25. In a continuous hot rolling facility that sequentially joins high-temperature slab materials and hot-rolls them, on the exit side of the continuous casting machine, a press means for thinning a desired portion of the slab material; and a joining means for joining the thinned parts of the cut adjacent slab materials, further comprising a heating means for heating the slab material on the entry side of the joining means. Continuous hot rolling equipment characterized by being equipped with. 26. In a continuous hot rolling facility that cuts slab materials produced by a continuous casting machine at desired locations, sequentially joins the slab materials, and performs hot rolling, the end portions of the cut slab materials are thinned. and a joining means for joining the thinned parts of the adjacent slab materials, further comprising a heating means for heating the slab materials on the entry side of the joining means. Inter-rolling equipment. 27, Claim 20, Claim 21, Claim 22, Claim 2
3. A continuous hot rolling facility, wherein the pressing means according to claims 25 and 26 respectively includes a pressing tool and pressing means for pressing the press die in the thickness direction of the slab material. 28. The press tool according to claim 27 is a pair of press tools having a parallel portion substantially parallel to the longitudinal direction of the slab material and an inclined portion inclined with respect to the parallel portion. Continuous hot rolling equipment. 29. A continuous hot rolling facility, wherein the pressing means according to each of claims 20, 21, 24, and 25 includes a moving means that moves in the strike direction of the slab material. 30. A continuous hot rolling facility, wherein the moving means according to claim 29 is moved by a cylinder. 31. A continuous hot rolling facility, wherein the cutting means according to each of claims 20, 21, 24, and 25 includes a moving means that moves in the strike direction of the slab material. 32. A continuous hot rolling facility, wherein the moving means according to claim 31 comprises a cylinder device and a truck driven by the cylinder device.