JP3254151B2 - Hot slab sizing press method and apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sizing press method and apparatus for forming a slab to a required sheet width before hot rough rolling.

[0002]

2. Description of the Related Art In recent years, a sizing press has been put into practical use as a device for pressing a slab in the width direction before rough rolling to form a predetermined plate width and obtaining a strip having a required plate width after finish rolling. ing.

[0003] As shown in FIG.
1 is intermittently conveyed, and both edges are pressed by both dies 52 while the slab 51 is stopped to form a predetermined plate width.

In the press, it is necessary to form the front end and the rear end of the slab 51 in advance as shown in FIG. 8, and the slab 51 buckles in the width direction by this press, and the front end and the rear end The buckling of the part becomes particularly large. When the buckling becomes large, the width of the slab 51 becomes larger than the required dimension when the slab 51 is roughly rolled, even if the two dies 52 are set at a predetermined interval and the width is reduced.

In order to prevent the slab 51 from buckling,
As shown in FIG. 6, when the intermittent conveyance of the slab 51 by the intermittent pinch roll 60 is stopped, the parallel portion 5 of the mold 52 is stopped.
The position of the slab 51 to be reduced in width by 3 is set to the support roller 5 on the exit side.
6a, the slab 51 is pressed by the pressing roller 56 and the hydraulic cylinder 58, and the position of the slab 51 whose width is reduced by the entry-side inclined portion 54 is supported by the entry-side support roller 57a and pressed by the pressing roller 57 and the hydraulic cylinder 59. (See Japanese Patent Publication No. 4-62803).

[0006]

The conventional sizing press has the following problems. (1) When the slab 51 is pressed by the pressing rollers 56 and 57, the pressing rollers 56 and 57 and the slab 51 come into line contact with each other and the pressing area is small, so that the slab 51 undergoes buckling due to buckling (surface deformation). . (2) It is difficult to change the positional relationship between the mold 52 and the pressing rollers 56 and 57. Therefore, since the pressing position cannot be changed depending on the pressing position (the front end, the rear end, and the center in the length direction) of the slab 51, the buckling of the front end and the rear end of the slab 51 is particularly insufficient. (3) Since the pressing rollers 56 and 57 are in constant contact with the high-temperature slab 51, the temperature of the pressing rollers 56 and 57 becomes high, and the wear thereof is promoted and surface cracks occur to shorten the life of the pressing rollers 56 and 57. (4) Since the slab 51 is constantly pressed by the pressing rollers 56 and 57, the pressing roller 5
6.57 pressing force is added to the conveying force, and the pinch roll 6
The load of 0 increases. Therefore, it is necessary to increase the power of the pinch roll 60. (5) Each time the slab 51 is transported, the hydraulic cylinders 58 and 59
When the pressing rollers 56 and 57 are lifted to release the pressing, the number of actuations of the hydraulic cylinders 58 and 59 becomes very large, and the life thereof is shortened.

[0007]

A sizing press according to the present invention for solving the above-mentioned problems is constituted as follows. (1) A sizing press including a slab conveying means and a pair of dies provided so as to squeeze both edge portions of the slab in the sheet width direction at the time of stop thereof in synchronization with the slab conveying means, the lower surface is a curved surface or a plane in a direction parallel to the slab conveying direction buckling restraint plate provided so as to lift above said slab, with the lower surface of the buckling restraint plate said slab intermittent conveying means tuning And a height adjusting means and an elevating means provided on the buckling restraint plate so as to be lowered until contact with the upper surface of the slab or a minute gap is formed when the slab stops. It is provided with a traveling direction position adjusting means.

[0008]

(2) A sizing press provided with a slab conveying means and a pair of dies provided so as to push down both edges of the slab in the sheet width direction while proceeding in synchronization with the slab conveying means. a is, the lower surface and buckling restraint plate provided above the slab to a curved surface in a direction parallel to the slab conveying direction, wherein the lower surface of the buckling restraint plate in phase with the slab conveyor means The buckling control device is provided with a lifting and lowering swinging means, a height adjusting means, and a position adjusting means provided on the buckling suppressing plate so as to descend until contact with the maximum buckling generating portion of the slab or formation of a minute gap.

( 3 ) The buckling suppressing plate is provided at a central portion in the width direction of the plate, and the length of the curved surface portion or the flat surface portion in the plate transport direction is set to be equal to the parallel portion of the mold, the entrance-side inclined portion. Has a length corresponding to

( 4 ) A plurality of support rollers are provided to support the lower surface of the slab in opposition to the buckling suppressing plate over a range substantially equal to the length of the curved surface portion or the flat portion of the buckling suppressing plate in the plate conveying direction. Is what is done.

Further, the sizing press method according to the present invention suppresses and diffuses the buckling lift generated during the sizing press of the hot slab by the buckling suppressing plate arranged in contact with or close to the upper surface of the hot slab. Features.

[0013] [Operation] (1) According to the claim, firstly, pressure together in accordance with the thickness of the width reduction the slab, to adjust the height by the height adjusting means
The leading and trailing ends of the slab are adjusted by the extension position adjusting means.
The buckling restraint plate is moved to the
Adjust so that it is located at an appropriate position in the rolling direction and wait.
Next, the leading end and the trailing end of the slab are stopped at the positions of the mold by the slab conveying means, respectively, so that the curved surface portion or the flat surface portion of the buckling suppressing plate is lightly contacted with the maximum buckling occurrence portion of the slab or forms a minute gap. As described above, each is lowered by the elevating means, and the width is reduced by both dies,
Each is pre-pressed to a predetermined plate width. Next, when the unpressed portion of the slab is conveyed and stopped by the slab conveying means with the effective length of the mold, the buckling suppressing plate is lowered by the elevating means in the same manner as described above, and the slab is bent at its curved surface portion or flat surface portion. The slab is pressed down to the required sheet width by suppressing and lifting the buckling due to buckling and reducing the width of the slab by both dies. By stopping the slab by the slab conveying means, suppressing the buckling of the slab by lowering the buckling suppressing plate, and reducing the width by the die, the slab is pressed to a required plate width over the entire length.

[0014]

According to ( 2 ), first, the height of the slab is adjusted by height adjusting means in accordance with the thickness of the slab to be reduced in width, and the leading and trailing ends of the slab are adjusted by rolling direction position adjusting means. When the width of each part and the center part is reduced, the buckling suppressing plate is adjusted so as to be positioned at the optimum position in the rolling direction and stands by. Next, while the leading and trailing ends of the slab are continuously conveyed by the slab conveying means, the curved surface portion of the buckling suppressing plate lightly contacts the maximum buckling occurrence portion of the slab due to the width reduction of the mold that proceeds in synchronization with this conveyance. Or, it is lowered and rocked (moves the contact portion with the slab or the fine gap forming portion in the slab advancing direction) by the lifting and lowering rocking means so as to form a minute gap, and simultaneously reduces the width while moving both dies, Each is pre-pressed to a predetermined plate width. Next, when the unpressed portion of the slab is conveyed by the slab conveying means, as described above, the lift due to buckling of the slab is suppressed and diffused on the curved surface portion, and the slab is reduced in width by both molds, Press to required width. The slab is continuously conveyed by the slab conveying means, buckling of the slab is suppressed by the lowering and swinging of the buckling suppressing plate, and the width of the slab is reduced by the die.

According to item ( 3 ), the buckling suppressing position can be made to correspond to the maximum buckling occurrence portion and all the pressing positions (the front end, the rear end, and the center in the longitudinal direction) of the slab.

According to the mode ( 4 ), the lower surface of the slab is supported corresponding to the buckling suppressing position.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a method and an apparatus for sizing and pressing a hot slab according to the present invention will be described in detail with reference to examples. [First Embodiment] [Configuration] In FIG. 1, reference numeral 1 denotes a buckling suppressing plate, which is parallel to the slab transport direction in a range slightly longer than the parallel pressure lower part a and the inclined pressure lower part b by the mold 52 on the lower surface thereof. A curved surface portion 1a having a large radius is formed in the direction, and a support shaft 9 projecting to the entrance side of both sides is suspended by a height adjustment cylinder 8, and the exit side is interposed by an eccentric bush 3 as height adjustment means. And is supported by the eccentric portion 2a of the eccentric shaft 2.

The width dimension of the buckling suppressing plate 1 is 1 of the slab width.
For example, when the slab width is 600 mm to 2200 mm, about 500 mm is preferable. In addition, buckling suppressing plate 1
As shown in FIG. 2, is installed at the center in the slab width direction.

The eccentric shaft 2 is connected to a motor 6 that rotates intermittently in synchronization with the intermittent transport pinch roll 60 by a universal joint 7.
Are connected via A worm gear 3a is provided at one end of the eccentric bush 3, and a worm 4 rotated by a motor 5 is provided so as to mesh with the worm gear 3a.

Reference numeral 10 denotes a plurality of support rollers (four in the drawing) disposed over substantially the same length range as the curved surface portion 1a. Reference numeral 52 denotes a die for pressing the slab 51 in the width direction having the parallel portion 53 and the entry-side inclined portion 54, and a pair of unillustrated pairs of not-shown pairs which operate in synchronization with the rotation of the intermittent transport pinch roll 60 and the motor 6. Each is installed in the width reduction device.
The curved surface portion 1a on the lower surface of the buckling suppressing plate 1 may be flat.

[Operation and Effect] First, the slab 5 to be reduced in width.
The height of the buckling suppressing plate 1 is adjusted by the rotation of the height adjusting cylinder 8 and the eccentric bush 3 in accordance with the thickness of the buckling suppressing plate 1, and the apparatus stands by. Next, the leading and trailing ends of the slab 51 are stopped at the positions of the mold 52, respectively, and the eccentric shaft 2 is intermittently rotated. Each time, it is lowered so as to form a light contact or a minute gap with the maximum buckling occurrence portion, thereby suppressing and diffusing the buckling up and down. Press.

When the pressing of the slab 51 in the width direction is completed and the slab 51 is intermittently conveyed for the next press, the eccentric shaft 2 is intermittently rotated to raise the buckling suppressing plate 1, and the curved surface thereof is raised. Avoid sliding between 1a and slab 51.

Next, when the unpressed portion of the slab 51 is intermittently conveyed by the intermittent conveying pinch roll 60 with the effective length of the mold 52 and stopped, the eccentric shaft 2 is driven to rotate by the motor 6 to rotate the buckling suppressing plate 1. As described above to suppress the slab 51 from rising due to buckling at the curved surface portion 1a,
The slab 51 is diffused and the slab 51 is
Is pressed down to the required width.

The slab 51 is repeatedly stopped, suppressed in buckling, reduced in width, and conveyed, and the slab 51 is pressed to the required plate width over the entire length.

In this embodiment, since the eccentric shaft 2 is used instead of the hydraulic cylinders 58 and 59 of the conventional device as the height adjusting means, the consumption of the height adjusting means can be reduced. Also, as in the present embodiment, the buckling suppressing plate 1 is brought close to the slab 51 to suppress the buckling lift and spread the buckling with a load of about 2.5 tons (in the case of a gap of 1 mm). it can. By the way, in the case of contacting and restraining from the beginning as in the related art, a load of about 10 tons is applied.

[Second Embodiment] [Configuration] In FIG. 3, reference numeral 11 denotes a buckling suppressing plate, and a slab conveying direction is set in a range slightly longer than the parallel lowering portion a and the inclined lowering portion b by the mold 52 on the lower surface thereof. A curved surface portion 11a having a large radius is formed in a direction parallel to
5 is suspended by a height adjusting cylinder 12 whose rod part is guided by a guide 14 and moves up and down.

A height adjusting cylinder 12 is provided on the upper surface on the exit side of the buckling suppressing plate 11.
Is suspended by a lifting cylinder 13 whose rod portion is guided by a guide 14. Other configurations are the same as those of the first embodiment.

[Operation and Effect] First, as in the first embodiment,
In accordance with the thickness of the slab 51, the height adjustment cylinders 12 on the entry side and the exit side adjust the height of the buckling suppression plate 11, and wait.

Next, the leading and trailing ends of the slab 51 are
The buckling suppression plate 11 is stopped at the position 2 and the buckling suppression plate 11 is lightly contacted with the maximum buckling occurrence portion of the slab 51 or forms a minute gap while guiding the rod portion of the lifting cylinder 13 with the guide 14. So that the support shaft 1
5 as a fulcrum and lower each time, and both molds 5
Each of them is reduced in width by 2 and pre-pressed to a predetermined plate width.

When the press of the slab 51 is completed and the slab 51 is intermittently transported for the next press,
The lifting cylinder 13 raises the buckling suppressing plate 1 to avoid sliding between the curved surface 1a and the slab 51.

Next, when the unpressed portion of the slab 51 is intermittently conveyed by the intermittent conveyance pinch roll 60 by the effective length of the mold 52 and stopped, the buckling suppressing plate 11 is lowered by the elevating cylinder 13 and the same as described above. Then, the lift of the slab 51 due to buckling is suppressed and diffused by the curved surface portion 11a, and the width of the slab 51 is reduced by both the dies 52 and pressed to a required plate width. The stop of the slab 51, the suppression of buckling, the width reduction, and the conveyance are repeated, and the slab 51 is pressed to a required plate width over the entire length.

[Third Embodiment] [Structure] In FIG. 4, reference numeral 21 denotes a buckling suppressing plate, and a flat portion 21a is provided in a range slightly longer than the parallel pressure lower portion a and the inclined pressure lower portion b of the lower surface of the mold 52. Are formed. In addition, height adjusting cylinders 23 are respectively provided on the upper surfaces of the entrance side and the exit side, and the entrance and exit side crank disks 2 that rotate intermittently in synchronization with the intermittent conveyance pinch roll 60 are provided.
2 are suspended via rods 24 respectively.

On the exit side of the buckling suppressing plate 21, a position adjusting cylinder 25 is provided. The lower surface of the buckling suppressing plate 21 may be a curved surface having a large radius, as in the first and second embodiments. Other configurations are the same as those of the first embodiment.

[Operation and Effect] First, as in the first embodiment,
Depending on the thickness of the slab 51, both height adjusting cylinders 2
3, the height of the buckling suppressing plate 21 is adjusted, and the position adjusting cylinder 25 adjusts the buckling suppressing plate 21 to the optimum position when the width of the front end portion, the rear end portion, and the center portion of the slab 51 is reduced. It is adjusted to be located in the slab traveling direction position and waits.

Next, the leading and trailing ends of the slab 51 are
2 and the crank disk 22 is intermittently rotated to rotate the rod 24 and the buckling suppression plate 21.
The flat portion 21a is lowered parallel to the slab 51 so as to form a small gap g with the slab 51, and the width of the flat portion 21a is reduced by the two dies 52, and the slab 51 is pressed in advance to a predetermined plate width.

When the pressing of the slab 51 is completed and the slab 51 is intermittently transported for the next press,
The two buckling suppressing plates 21 are raised in parallel by intermittently rotating the two crank disks 22 to avoid sliding between the curved surface 1 a and the slab 51.

Next, when the unpressed portion of the slab 51 is intermittently conveyed by the intermittent conveying pinch roll 60 by the effective length of the mold 52 and stopped, the buckling suppressing plate 21 is lowered in parallel by the intermittent rotation of the crank disk 22. In the same manner as described above, the flat portion 21a is lightly brought into contact with the slab 51 or a small gap g is formed to suppress and diffuse the slab 51 from rising due to buckling, and reduce the width of the slab 51 by the two dies 52. And press it to the required width.

The stop of the slab 51, suppression of buckling, width reduction, and conveyance are repeated, and the slab 51 is pressed to a required plate width over the entire length.

In this embodiment, since the crank disk 22 is used as the height adjusting means in place of the hydraulic cylinders 58 and 59 of the conventional device, the consumption of the height adjusting means can be reduced.

Fourth Embodiment [Configuration] In FIG. 5, reference numeral 31 denotes a buckling suppression plate,
A curved surface portion 31a is formed in a direction parallel to the slab transport direction . In addition, height adjusting cylinders 33 are provided on the upper surfaces on the entrance side and the exit side, respectively, and the entrance side crank discs which rotate in synchronization with the conveyance of the slab 51 by the continuous conveyance pinch rolls 36 as swinging up / down means. 32a, and an outgoing crank disk 32b having different phases at which the incoming crank disk 32a and the rod 34 are axially attached are suspended via the rod 34, respectively.

A feed cylinder 35 is provided on the entry side of the buckling suppressing plate 31. Reference numeral 10 denotes a support roller.

[Operation / Effect] First, similarly to the third embodiment, the buckling suppressing plate 3 is
The height of the buckling control plate 31 is adjusted by the feed cylinder 35 so that the buckling suppressing plate 31 is positioned at the optimum position in the slab advancing direction at the time of reducing the width of each of the front end portion, the rear end portion, and the central portion of the slab 51. Adjust and wait.

Next, while the slab 51 is being conveyed by the continuous conveyance pinch roll 36, the input side crank disk 32
a and the outgoing crank disk 32b,
The buckling restraint plate 31 is lowered by the feed cylinder 35 in the slab advancing direction by the feed cylinder 35 while lowering the curved surface portion 31a so as to lightly contact the maximum buckling occurrence portion of the slab 51 or to form a small gap g via the buckling suppression plate 31. The slab 51 is extruded and rocked at the same speed as the traveling, and is lightly brought into contact with the maximum buckling generation portion of the slab 51 or the width is reduced by both the molds 37 while forming a minute gap to suppress the buckling of the slab 51. The front and rear ends are pre-pressed to a predetermined plate width.

Next, when the unpressed portion of the slab 51 is conveyed by the continuous conveyance pinch roll 36, the buckling suppressing plate 31 is lowered by the rotation of the input crank disk 32a and the output crank disk 32b having different phases. While being swung by the feed cylinder 35 in the same manner as described above, the curved surface portion 31a is lightly brought into contact with the maximum buckling occurrence portion of the slab 51 or a minute gap is formed to suppress and diffuse the slab 51 from rising due to buckling. At the same time, the width of the slab 51 is reduced by the two dies 36 and pressed to a required plate width.

Due to the swinging of the buckling suppressing plate 31, the contact portion between the curved surface portion 31a and the slab 51 or the minute gap forming portion is moved in the slab advancing direction while the die 37 is being reduced in width while advancing. proceed.

The buckling of the slab 51 due to the lowering and swinging of the buckling suppressing plate 31 and the width reduction by the mold 37 are repeated, and the continuously conveyed slab 51 is pressed to the required width over the entire length.

The two dies 37 reduce the width of the slab 51 while proceeding in synchronism with the continuous conveyance of the slab 51. When the width reduction is completed, the dies 37 stop moving and retreat from the slab 51. That is, the rectangular arrow in the figure indicates the moving direction of the mold 37, the press starts at the position of the arrow a, and the arrow b indicates the synchronous movement of the press and the slab. That is, in the present embodiment, the slab 51 is not intermittently transported but is continuously transported without stopping, and the buckling suppressing plate 31 is synchronously moved with the slab 51 in the slab transport direction by the feed cylinder 35.

Further, in this embodiment, since the contact position between the slab 51 and the curved surface portion 31a moves and does not always contact each other as in the prior art, thermal damage to the buckling suppressing plate 31 can be minimized. The durability of the buckling suppressing plate 31 increases. Further, the durability of the buckling suppressing plate 31 may be enhanced by forming the inside of the buckling suppressing plate 31 with a water cooling structure.

[0050]

【The invention's effect】

(1) claimed in the claim 1 and 5, the lower surface of the raised and lowered to adjust the height of the slab conveying direction buckling restraint formed in a curved or flat in a direction parallel to the plate, at the time the lowermost intermittent slab by the lower surface By forming a contact or a minute gap with the upper surface when the conveyance is stopped, the following effects are obtained. (A) It is possible to cope with a change in the thickness of the slab to be reduced in width, and to suppress buckling such that the lower surface thereof contacts the upper surface of the slab or forms a minute gap when the buckling suppressing plate is lowered most. The height of the plate can be adjusted. (B) Lifting due to buckling in a long range in the rolling direction of the slab can be suppressed and diffused, so that large buckling of the slab can be completely prevented. (C) Since the area of the lower surface of the buckling suppressing plate is large, when the slab is lifted, the surface pressure is reduced, and the occurrence of brinelling can be prevented. (D) When the slab is transported, the buckling suppressing plate is raised so as not to come into contact with the slab, so that the load on the slab intermittent transport means can be reduced. Therefore, the power of the slab conveying means can be reduced. In addition, by providing the rolling direction position adjusting means on the buckling suppression plate, the buckling suppression plate is positioned at each optimal rolling direction position when the width of each of the leading end, the rear end, and the center of the slab is reduced. Can be adjusted to Therefore, buckling of the slab can be effectively suppressed.

[0051]

[0052] (2) In the second aspect, in addition to the effects of claim 1, the lower surface of the buckling restraint plate is formed in a curved surface in a direction parallel to the slab conveying direction, the lifting swinging means the buckling restraint plate And, by providing the height adjustment means, when the width of the front end portion, the rear end portion, and the central portion of the slab continuously conveyed is reduced, the buckling suppression plate is provided at each of the maximum buckling occurrence portions. By making the curved surface portion lightly contact or forming a minute gap and swinging the buckling suppressing plate, the contact portion or the gap forming portion can be advanced and maintained together with the transport of the slab. Further, by providing the buckling suppressing plate with the rolling direction position adjusting means, it is possible to adjust the buckling suppressing plate so as to be positioned at the optimum rolling direction position. Therefore, buckling of the slab can be effectively suppressed.

( 3 ) In the third aspect , in addition to the effect of the first aspect, the buckling suppressing position is changed to all the pressing positions of the maximum buckling generating portion and the slab (the front end portion, the rear end portion, and the center in the length direction). )
Is made to correspond to. Therefore, buckling of the slab can be effectively suppressed.

( 4 ) In claim 4 , in addition to the effect of claim 1, the lower surface of the slab is supported corresponding to the buckling restraining position. Therefore, buckling of the slab can be effectively suppressed.

[Brief description of the drawings]

FIG. 1 is a side view schematically showing a sizing press as a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a side view schematically showing a sizing press as a second embodiment of the present invention.

FIG. 4 is a side view schematically showing a sizing press as a third embodiment of the present invention.

FIG. 5 is a side view schematically showing a sizing press as a fourth embodiment of the present invention.

FIG. 6 is a side view schematically showing a sizing press device as an example of a conventional device.

FIG. 7 is a plan view showing a press of the slab in a plate width direction.

FIG. 8 is a perspective view showing buckling of the slab in pressing in the plate width direction.

[Explanation of symbols]

 1, 11, 21, 31 Buckling suppressing plate 1a, 11a, 31a Curved surface portion 2 Eccentric shaft 2a Eccentric portion 3 Eccentric bush 8, 12, 23, 33 Height adjusting cylinder 9, 15 Support shaft 10 Support roller 13 Lifting cylinder 21a Flat portion 22 Crank disk 25 Position adjustment cylinder 32a Inlet crank disk 32b Outgoing crank disk 35 Feed cylinder 36 Continuous transport pinch roll 37, 52 Mold 51 Slab 60 Intermittent transport pinch roll g Minute gap

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-70308 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B21B 15/00 B21B 1/02

Claims (5)

(57) [Claims] 1. A sizing press comprising a slab conveying means, and a pair of dies provided so as to squeeze both edges of the slab in the sheet width direction when the slab is stopped in synchronization with the slab conveying means. Te, the buckling restraint plate provided to the lower surface and a curved surface or a plane in a direction parallel to the slab conveying direction elevation above said slab, said lower surface of the buckling restraint plate the slab intermittent conveying means Height adjusting means and elevating means provided on the buckling suppression plate so as to fall in contact with the upper surface of the slab or to form a minute gap when the slab is stopped,
And a slab advancing direction position adjusting means provided on the buckling suppressing plate. 2. A sizing press comprising a slab conveying means and a pair of dies provided so as to press down both edge portions of the slab in the sheet width direction while proceeding in synchronization with the slab conveying means. there are, said the buckling restraint plate provided above the slab bottom surface to a curved surface in a direction parallel to the slab conveying direction, said lower surface of the buckling restraint plate in phase with the slab conveyor means slabs A buckling restraint plate provided with a raising / lowering rocking means, a height adjusting means and a position adjusting means provided so as to descend to a maximum buckling occurrence portion or a small gap is formed. Slab sizing press. 3. The apparatus according to claim 1, wherein the buckling suppressing plate is provided at a central portion in a width direction of the plate, and a length of the curved portion or the flat portion in the plate conveying direction is set to be gold. A hot slab sizing press device having a length corresponding to a parallel portion of a mold and an entrance-side inclined portion. 4. The apparatus according to claim 1, wherein the supporting roller for supporting the lower surface of the slab opposite to the buckling suppressing plate has a curved portion or a flat portion of the buckling suppressing plate in the plate conveying direction. A hot slab sizing press apparatus, wherein a plurality of hot slab sizing press apparatuses are provided over a length range substantially the same as the above. 5. Sizing of a hot slab The sizing of a hot slab is characterized in that the buckling lift generated at the time of pressing is suppressed and diffused by a buckling suppressing plate arranged in contact with or close to the upper surface of the hot slab. Press method.