JPH10166011A - Hot rolling equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide hot rolling equipment whose rolling mill is made compact by reducing rolling load and rolling torque and with which rolled stocks good in quality are obtained. SOLUTION: This equipment is provided with a 2-high rolling mill for hot- rolling a slab 100 into a sheet bar 100a, the 2-high rolling mill has an upper work roll 1 and lower work roll 2 for the base stocks of the barrel parts of which high-speed tool steel is used and on the outer peripheral surface of which a lot of dimples 1a, 2a are provided and also the plural rows of spray nozzles 6 with which water 111 is jetted opposing to these upper work roll 1 and lower work roll 2 are arranged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel strip hot rolling equipment, and more particularly to a two-high rolling mill for hot rolling a rolled material.

[0002]

2. Description of the Related Art FIG. 7 shows a conventional hot two-high rolling mill. As shown in the figure, the height of the upper surface of the lower work roll 102 is set by the height adjusting cylinder 109, and the screw
07, the height of the upper work roll 101 is adjusted to set a required roll gap. Then, the upper and lower work rolls 101 and 102 are driven and rotated, and the water 111 supplied to the header 105 is moved upward and downward by the spray nozzle 106.
While being sprayed onto the lower work rolls 101 and 102, the slab 100 heated to a required temperature is caught in the roll gap, and hot rough-rolled into a sheet bar 100a having a required thickness.

When the thickness of the slab 100 fluctuates during rolling, the upper work roll 10 is
1 is finely moved up and down to adjust the roll gaps, respectively, so that the thickness of the sheet bar 100a to be rolled is kept constant. In the figure, 103 is an upper roll chock, 104 is a lower roll chock, and 110 is a housing.

[0004]

In the above-described hot two-high rolling mill, since the coefficient of friction between the upper and lower work rolls and the rolled material is large, and as a result, the rolling load and the rolling torque are large, the rolling mill must be used. There was a problem that it was necessary to increase it. Also, since the surface pressure between the upper and lower work rolls and the rolled material is high, the surface roughness of the upper and lower work rolls becomes remarkable,
There is a drawback that the rough surface is transferred to a rolled material and its quality is reduced.

[0005]

Means for Solving the Problems The hot rolling equipment according to the present invention is constituted as follows to achieve the above object. (1) A two-high rolling mill for hot-rolling a rolled material is used. The two-high rolling mill uses a high-speed tool steel (hereinafter referred to as a high-speed steel) as a material for a barrel portion and has a large number of dimples on its outer peripheral surface. The upper work roll and the lower work roll provided with, and the liquid ejecting means facing the upper work roll and the lower work roll are provided.

(2) A two-high rolling mill for hot-rolling a rolled material, the two-high rolling mill comprising an upper bearing box and a lower bearing box on which at least two sets of upper work rolls and lower work rolls are respectively mounted. A two-stage rolling mill in which the upper work roll and the lower work roll are provided with upper work roll elevating means and lower work roll elevating means, respectively. An upper work roll and a lower work roll provided with a large number of dimples on the outer peripheral surface thereof by using high speed steel, and liquid ejecting means opposed to the upper work roll and the lower work roll are provided.

(3) A two-high rolling mill for hot-rolling the rolled material is provided. The two-high rolling mill rotates an upper eccentric bush and a lower eccentric bush on which an upper work roll and a lower work roll are axially mounted, respectively, by a frame. This is a two-high rolling mill in which each of the upper eccentric bush and the lower eccentric bush is provided with eccentric bush rotating means, and a number of dimples are formed on the outer peripheral surface of the barrel using a high speed steel. The upper work roll and the lower work roll are provided, and the liquid ejecting means facing the upper work roll and the lower work roll is provided.

(4) At least two two-high rolling mills according to the above (3) are arranged close to each other.

(5) A two-high rolling mill for hot rolling the rolled material is provided. The two-high rolling mill has an upper bearing block and a lower bearing block each having an upper work roll and a lower work roll axially mounted on the frame. The upper bearing block lift hole and the lower bearing block lift hole provided are respectively supported, and a lowering wedge provided with an inclination in the roll axis direction is provided between the upper surface of the upper bearing block and the upper bearing block lifting hole,
A two-stage rolling mill in which a height adjusting wedge provided with an inclination in the roll axis direction is provided on the lower surface of the lower bearing block and the lower bearing block elevating hole, and a wedge moving means is provided on the pressing wedge and the height adjusting wedge. There is provided an upper work roll and a lower work roll provided with a large number of dimples on the outer peripheral surface thereof by using high-speed steel for the material of the barrel portion, and a liquid ejecting means opposed to the upper work roll and the lower work roll. It becomes.

(6) At least two two-high rolling mills according to the above (5) are arranged close to each other.

[Operation] According to the item (1), the upper work roll and the lower work roll, each of which is provided with a dimple on the outer peripheral surface, are driven and rotated.
While the liquid is jetted to the upper work roll and the lower work roll by the liquid jetting means, the rolled material heated to a required temperature is bitten into the roll gap, and is rolled to a required thickness by the upper work roll and the lower work roll. I do. During this rolling, the liquid jetted by the liquid jetting means is confined in a large number of dimples provided on the outer peripheral surfaces of the upper work roll and the lower work roll, and this liquid is introduced into a contact arc with the rolled material to form a lubricating film. By becoming
The coefficient of friction between the upper and lower work rolls and the rolled material is reduced, and as a result, the rolling load and rolling torque are reduced.
The use of high-speed steel for the barrel material of the upper work roll and the lower work roll reduces wear and maintains the shape of the dimple.

According to item (2), at least two sets of lower bearing boxes are moved up and down by the lower work roll elevating means to set the height of the upper surface of the lower work roll, respectively, and at least two sets are made by the upper work roll elevating means. The height of the lower surface of the upper work roll is adjusted by raising and lowering the upper bearing box, and at least two sets of required roll gaps of the upper work roll and the lower work roll each provided with a large number of dimples on the outer peripheral surface Are set respectively. Next, the upper work roll and the lower work roll are driven and rotated, and while the liquid is jetted onto the upper work roll and the lower work roll by the liquid jetting means, the rolled material heated to a required temperature is supplied to the upstream side. Rolling is performed while being engaged in the roll gaps of the upper and lower work rolls, and is further performed by being engaged in the roll gaps of the upper and lower work rolls on the downstream side to a required thickness. During this rolling, the liquid jetted by the liquid jetting means is confined in a large number of dimples provided on the outer peripheral surfaces of the upper work roll and the lower work roll, and this liquid is introduced into a contact arc with the rolled material to form a lubricating film. As a result, the coefficient of friction between the upper and lower work rolls and the rolled material is reduced, and as a result, the rolling load and rolling torque are reduced. By hot rolling the rolled material by at least two pairs of upper and lower work rolls close to each other, the temperature reduction of the rolled material is reduced, the scale generated in the rolled material is reduced, and the meander of the rolled material is reduced. When the thickness of the rolled material changes during rolling, the upper work roll elevating means raises and lowers each upper work roll finely, adjusts the roll gap, and keeps the thickness of the rolled material to be rolled constant. . The use of high-speed steel for the barrel material of the upper work roll and the lower work roll reduces wear and maintains the shape of the dimple.

According to item (3), the upper eccentric bush and the lower eccentric bush are simultaneously rotated at required angles by the eccentric bush rotating means, respectively, and the upper work roll and the lower eccentric bush each provided with a large number of dimples on the outer peripheral surface. Adjust the height of the work rolls to set the required roll gap. Next, the upper work roll and the lower work roll are driven and rotated, and while the liquid is jetted to the upper work roll and the lower work roll by the liquid jetting means, the rolled material heated to a required temperature is bitten into the roll gap. ,
Roll to the required thickness by the upper and lower work rolls. During this rolling, the liquid jetted by the liquid jetting means is confined in a large number of dimples provided on the outer peripheral surfaces of the upper work roll and the lower work roll, and this liquid is introduced into a contact arc with the rolled material to form a lubricating film. As a result, the coefficient of friction between the upper and lower work rolls and the rolled material is reduced, and as a result, the rolling load and rolling torque are reduced. When the thickness fluctuates during the rolling of the rolled material, the upper eccentric bush and the lower eccentric bush are simultaneously rotated at the required angles, respectively, and the upper work roll and the lower work roll are finely moved up and down respectively to adjust the roll gap. Then, the thickness of the rolled material to be rolled is kept constant. The use of high-speed steel for the barrel material of the upper work roll and the lower work roll reduces wear and maintains the shape of the dimple.

According to item (4), each of the upper eccentric bush and the lower eccentric bush is simultaneously rotated up and down by a required angle by the eccentric bush rotating means, and a plurality of dimples are provided on the outer peripheral surface. The height of the upper work roll and the lower work roll are adjusted to set the required roll gaps. Next, the upper work roll and the lower work roll are driven and rotated, and while the liquid is jetted onto the upper work roll and the lower work roll by the liquid jetting means, the rolled material heated to a required temperature is supplied to the upstream side. Rolling is performed so as to be engaged in the roll gap, and further reduced to a required thickness while being engaged in the roll gap on the downstream side. During this rolling, the liquid jetted by the liquid jetting means is confined in a large number of dimples provided on the outer peripheral surfaces of the upper work roll and the lower work roll, and this liquid is introduced into a contact arc with the rolled material to form a lubricating film. As a result, the coefficient of friction between the upper and lower work rolls and the rolled material is reduced, and as a result, the rolling load and rolling torque are reduced. By hot rolling the rolled material by at least two pairs of upper and lower work rolls close to each other, the temperature reduction of the rolled material is reduced, the scale generated in the rolled material is reduced, and the meander of the rolled material is reduced. When the thickness fluctuates during rolling of the rolled material, each upper eccentric bush and lower eccentric bush are simultaneously rotated at a required angle, respectively, and each upper work roll and lower work roll are finely lifted and lowered, respectively, and The roll gap is adjusted to keep the thickness of the rolled material constant. The use of high-speed steel for the barrel material of the upper work roll and the lower work roll reduces wear and maintains the shape of the dimple.

According to the mode (5), the height adjusting wedge is moved in the roll axis direction by the wedge moving means to raise and lower the lower bearing block, and the height of the upper surface of the lower work roll provided with a large number of dimples on the outer peripheral surface. The upper bearing block is moved up and down by moving the drafting wedge in the roll axis direction and adjusting the height of the lower surface of the upper work roll provided with a large number of dimples on the outer peripheral surface to set the required roll gap. . Next, the upper work roll and the lower work roll are driven and rotated, and while the liquid is jetted to the upper work roll and the lower work roll by the liquid jetting means, the rolled material heated to a required temperature is bitten into the roll gap. The roll is rolled to a required thickness by the upper work roll and the lower work roll. During this rolling, the liquid ejected by the liquid ejecting means is confined to a large number of dimples provided on the outer peripheral surfaces of the upper work roll and the lower work roll,
When this liquid is introduced into the contact arc with the rolled material to form a lubricating film, the friction coefficient between the upper and lower work rolls and the rolled material is reduced, and as a result, the rolling load and rolling torque are reduced. When the thickness fluctuates during the rolling of the rolled material, the rolling wedge moves in the roll axis direction, the upper work roll and the lower work roll are finely raised and lowered, respectively, to adjust the roll gap, and the rolled material to be rolled is adjusted. Keep the thickness constant. The use of high-speed steel for the barrel material of the upper work roll and the lower work roll reduces wear and maintains the shape of the dimple.

According to the mode (6), each height adjusting wedge is moved in the roll axis direction by the wedge moving means to raise and lower each lower bearing block.
Set the height of the upper surface of each lower work roll provided with a large number of dimples on the outer peripheral surface, and move each pressing wedge in the roll axis direction to raise and lower each upper bearing block, respectively, The height of the lower surface of each upper work roll provided with the dimples is adjusted, and the required roll gap is set. next,
The upper work roll and the lower work roll are respectively driven and rotated, and while the liquid is jetted to the upper work roll and the lower work roll by liquid jetting means, the rolled material heated to a required temperature is rolled on the upstream side. Rolling is performed while being engaged in the gap, and further to a required thickness while being engaged in the roll gap on the downstream side. During this rolling, the liquid jetted by the liquid jetting means is confined in a large number of dimples provided on the outer peripheral surfaces of the upper work roll and the lower work roll, and this liquid is introduced into a contact arc with the rolled material to form a lubricating film. As a result, the coefficient of friction between the upper and lower work rolls and the rolled material is reduced, and as a result, the rolling load and rolling torque are reduced. By hot rolling the rolled material by at least two pairs of upper and lower work rolls close to each other, the temperature reduction of the rolled material is reduced, the scale generated in the rolled material is reduced, and the meander of the rolled material is reduced. When the thickness of the rolled material changes during rolling, each rolling wedge is moved in the roll axis direction, and the upper work roll and the lower work roll are finely moved up and down respectively to adjust the roll gap, and the rolling is performed. The thickness of the rolled material is kept constant. The use of high-speed steel for the barrel material of the upper work roll and the lower work roll reduces wear and maintains the shape of the dimple.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to embodiments.

[First Embodiment] [Configuration] As shown in FIG. 3, a slab 100 as a rolled material manufactured by a continuous casting apparatus (not shown) is heated in a heating furnace 92.
Heated and kept warm inside. A reverse type rough rolling mill R is provided continuously to the delivery line of the heating furnace 92,
A finishing mill F is provided continuously to the delivery line of the rough mill R. Cooling device 93 continuously to finishing mill F
The strip 100b, which has been finish-rolled by the finishing mill F, is cooled and wound into a coil by the winder 94. 95 is a hot run table in the figure,
P indicates a pass line.

In FIGS. 1 and 2 showing the structure of the rough rolling mill R, high-speed steel is used for the material of the barrel portion of the upper work roll 1 and the lower work roll 2, and a large number of dimples 1a are formed on the outer peripheral surface thereof. , 2a are respectively formed. Both ends of the upper work roll 1 and the lower work roll 2 are rotatably mounted on the upper bearing box 3 and the lower bearing box 4, respectively, and are housed in the housing 10, respectively. The drive-side ends of the upper and lower work rolls 1 and 2 are connected to drive devices via universal joints (not shown).

The lower screw 7 and the lower cylinder 8 are mounted on the upper bearing box 3 and the upper part of the housing 10, respectively.
A height adjusting cylinder 9 is interposed between the housing 10 and the lower part of the housing 10, respectively.

Between the work side and the drive side housing 10, upper and lower headers 5 which are located on the entrance and exit sides of the upper and lower work rolls 1 and 2 and which are connected to a water supply device (not shown) are provided. The spray nozzles 6 are arranged in the header 5 so as to face the upper and lower work rolls 1 and 2.

[Operation and Effect] The slab 100 discharged at a predetermined thickness from a continuous casting device (not shown) or the like is cut into a predetermined length by a cutting device (not shown), and then heated by a heating furnace 9.
Heated and kept warm at 2. Slab 100 exiting heating furnace 92
Is made into a sheet bar 100b of, for example, 30 mm by reverse rolling by a rough rolling mill R and sent to a finishing rolling mill F. In finishing mill F, due to the 4-high rolling mill F ₁ to F ₇ of 7 stands 7
By rolling in stages, for example, a 1.2 mm strip 100b
Then, it is wound on a winder 94 through a cooling device 93 and a hot run table 95.

The height of the upper surface of the lower work roll 2 is set by the height adjusting cylinder 9, and the height of the upper work roll 1 is adjusted by the pressing screw 7 to set a required roll gap. Then, the water 111 supplied to the header 5
By the spray nozzle 6, the upper and lower work rolls 1, 2
The upper work roll 1 and the lower work roll 2 are driven to rotate while being sprayed on the surface. In the case of reverse rolling, the header 5 is switched so that oil injection is always performed on the work roll entry side.

Next, the slab 10 heated to a required temperature
0 is engaged in the roll gap, and hot rough rolling is performed on a sheet bar 100a having a required thickness.

At the time of this rolling, a large number of dimples 1 provided on the outer peripheral surfaces of the upper work roll 1 and the lower work roll 2 are formed.
The water 111 injected from the spray nozzle 6 is confined in the a and 2a, and the water 111 is introduced into the contact arc with the slab 100 to form a lubricating film. The rolling friction and rolling torque are reduced as a result.

When the thickness of the slab 100 fluctuates during rolling, the upper work roll 1 is finely moved up and down by the pressing cylinder 8 to finely adjust the roll gaps.
The thickness of the rolled sheet bar 100a is kept constant.

In this embodiment, the upper work roll 1
The use of high-speed steel as the material of the barrel portion of the lower work roll 2 reduces its wear and reduces the dimples 1a, 2
The shape of the sheet bar 100a can be maintained satisfactorily and the quality of the sheet bar 100a can be obtained.

Further, in this embodiment, an example in which the slab 100 is roughly hot-rolled to the sheet bar 100a is extended. However, the present invention is not limited to the last stand of the finishing mill row in which the sheet bar 100a is finish-rolled into the strip 100c. It can also be applied to finishing mill F ₁ to F ₆ in.

[Second Embodiment] [Configuration] FIG. 4 shows another configuration of the rough rolling mill R.
High-speed steel is used as a material for the barrel portions of both the upper work roll 1 and the lower work roll 2, and a large number of dimples 1a and 2a are formed on the outer peripheral surface thereof. Both ends of the upper work roll 1 and the lower work roll 2 are rotatably mounted on upper bearing boxes 13 and 23 and lower bearing boxes 14 and 24, respectively, and are housed in the housing 20, respectively. The drive-side ends of the upper and lower work rolls 1 and 2 are connected to a drive unit via universal joints (not shown).

The lower screws 17, 27 and the lower cylinders 18, 28 are provided on the upper bearing boxes 13, 23 and the upper part of the housing 20, and the height adjusting cylinders 19, 28 are provided on the lower bearing boxes 14, 24 and the lower part of the housing 20. 29 are interposed.

Upper and lower headers 5 connected to a water supply device (not shown) are provided between the working-side and drive-side housings 20, and spray nozzles 6 are mounted on the upper and lower work rolls 1, 2. Are arranged opposite to each other.

In this embodiment, two sets of upper and lower work rolls 1 and 2 and upper and lower bearing housings 13, 14, 23 and 24 are provided.
Is housed in the housing 20, but it is also possible to enlarge the housing 20 to house three sets of upper and lower work rolls 1 and 2, and also upper and lower bearing boxes.

[Action and Effect] Height adjusting cylinders 19 and 2
9, the height of the upper surface of the lower work roll 2 is set, and the height of the upper work roll 1 is adjusted by the pressing screws 17 and 27 to set a required roll gap.
Water 111 supplied by the spray nozzle 6
Upper work roll 1 while spraying onto lower work rolls 1 and 2
And the lower work roll 2 is driven and rotated.

Next, the slab 10 heated to a required temperature
0 is rolled while being engaged in the roll gap on the upstream side,
Further, the slab 100 is engaged in the roll gap on the downstream side and hot rough-rolled into a sheet bar 100a having a required thickness.

At the time of this rolling, a large number of dimples 1 provided on the outer peripheral surfaces of the upper work roll 1 and the lower work roll 2 are formed.
The water 111 injected from the spray nozzle 6 is confined in the a and 2a, and the water 111 is introduced into the contact arc with the slab 100 to form a lubricating film. The rolling friction and rolling torque are reduced as a result.

If the thickness of the slab 100 fluctuates during rolling, the upper work rolls 1 are finely moved up and down by the pressing cylinders 18 and 28 to finely adjust the roll gaps of the slabs 100, respectively. The thickness of 100a is kept constant.

In this embodiment, the upper work roll 1
And the use of high-speed steel as the material of the barrel portion of the lower work roll 2 reduces its wear and reduces dimples 1a, 2
The shape of the sheet bar 100a can be maintained satisfactorily and the quality of the sheet bar 100a can be obtained.

Further, in this embodiment, similar to the first embodiment, an example in which the slab 100 is hot rough-rolled to the sheet bar 100a is described. However, in the present invention, the sheet bar 100a is finish-rolled into the strip 100c. it is also applicable to the finishing mill final stand other than finishing rolling mill F ₁ to F ₆ columns.

Third Embodiment [Configuration] Another configuration of the rough rolling mill R is shown in FIG.
High-speed steel is used as a material for the barrel portions of both the upper work roll 1 and the lower work roll 2, and a large number of dimples 1a and 2a are formed on the outer peripheral surface thereof. Both ends of the upper work roll 1 and the lower work roll 2 are rotatably mounted on upper eccentric bushes 32 and 42 and lower eccentric bushes 33 and 43, respectively. 33 and 43 are No. 1 frames (upper and lower roll chocks are integrated) 31
And a No. 2 frame (in which the upper and lower roll chocks are integrated) 41 are rotatably supported respectively.

No. 1 frame 31 and No. 2 frame 41
The upper eccentric bushes 32, 42 projecting from above the upper eccentric bushes 32, 42 are provided with upper worm wheels 34, 44 at both ends thereof.
A lower worm wheel 3 is provided at both ends of the lower eccentric bushes 33 and 43 projecting from below the No. 1 and No. 2 frames 41.
5, 45 are fitted respectively. And on this,
Upper worms 36, 46 and lower worm 37, which are screwed to lower worm wheels 34, 44, 35, 45, respectively.
47 is the drive side and work side No. 1, 2 frame 31,
Upper motor 3 mounted on the upper and lower parts of 41
8, 48 and the lower motors 39, 49, respectively.

The No. 1 frame 31 on the working side and the driving side
Upper and lower headers 5 connected to a water supply device (not shown) are provided between the No. 2 frames 41. Spray nozzles 6 are provided on the header 5 in rows facing the upper and lower work rolls 1 and 2. Have been.

With the above members and equipment, the No. 1 eccentric bush type two-high rolling mill 40 and the No. 2 eccentric bush type 2
The rolling mill 50 is configured.

These No. 1 eccentric bush type two-high rolling mills 4
The 0 and No. 2 eccentric bush type two-high rolling mills 50 are erected close to the base block 59.

In this embodiment, two eccentric bush type two-high rolling mills 40 and 50 are erected close to the base block 59. However, one eccentric bush type two-high rolling mill can be used. If the size is increased, the number of the eccentric bush type two-high rolling mills can be increased.

Further, both lower worm wheels 35, 4
5 and the lower worms 37 and 47 are left-handed screws, and both lower worms 37 and 47 are connected to the upper worms 36 and 47 by connecting shafts.
It is also possible to omit both lower motors 39 and 49 in connection with 46.

[Operation and Effect] Each of the upper and lower motors 38,
48, 39, 49, upper and lower worms 36, 46,
By simultaneously rotating the upper and lower eccentric bushes 32 and 42 and the lower eccentric bushes 33 and 43 at the required angles in the vertical and opposite directions, respectively, by simultaneously rotating the upper and lower eccentric bushes 37 and 47 in the opposite directions. The roll 1 and the lower work roll 2 are respectively raised and lowered to set required roll gaps, and the water 111 supplied to the header 5 is sprayed onto the upper and lower work rolls 1 and 2 by the spray nozzle 6 while the upper work roll 1 is being sprayed. And the lower work roll 2 is driven and rotated.

Next, the transported slab 100 is engaged in the roll gap on the upstream side to perform hot rough rolling, and the slab 100 is engaged in the roll gap on the downstream side before hot finish rolling. Hot rough rolling on the sheet bar 100a.

At the time of this rolling, a large number of dimples 1 provided on the outer peripheral surfaces of the upper work roll 1 and the lower work roll 2
The water 111 injected from the spray nozzle 6 is confined in the a and 2a, and the water 111 is introduced into the contact arc with the slab 100 to form a lubricating film. The rolling friction and rolling torque are reduced as a result.

If the thickness of the slab 100 fluctuates during rolling, the upper and lower worms 36, 46, 37, and 47 are rotated by the respective motors 38, 48, 39, and 49 so that the upper eccentric bushings are rotated. 32, 42 and the lower eccentric bushings 33, 43 are simultaneously rotated vertically and in opposite directions, respectively, at required angles, and both upper work rolls 1 and lower work rolls 2 are finely moved up and down, respectively, so that both the roll gaps are reduced. Each is finely adjusted and the thickness of the rolled sheet bar 100a is kept constant.

In this embodiment, the upper work roll 1
And the use of high-speed steel for the material of the barrel portion of the lower work roll 2 reduces its wear and reduces dimples 1a,
The shape of the sheet bar 100a can be obtained satisfactorily while maintaining the shape of the sheet bar 2a.

Further, in the present embodiment, similar to the first embodiment, an example in which the slab 100 is hot rough-rolled to the sheet bar 100a is described. However, in the present invention, the sheet bar 100a is finish-rolled into the strip 100c. it is also applicable to the finishing mill final stand other than finishing rolling mill F ₁ to F ₆ columns.

Fourth Embodiment [Configuration] FIG. 6 shows another configuration of the rough rolling mill R.
High-speed steel is used as a material for the barrel portions of both the upper work roll 1 and the lower work roll 2, and a large number of dimples 1a and 2a are formed on the outer peripheral surface thereof. Both ends of the upper work roll 1 and the lower work roll 2 are rotatably mounted on upper bearing blocks 62 and 82 and lower bearing blocks 63 and 83, respectively. Upper taper sleeves 64 and 84 each having an axial taper are mounted.

Then, both upper bearing blocks 62, 82
And the upper taper sleeves 64 and 84 are the No. 1 frame (the upper and lower roll chocks are integrated) 61 and
Ascending and descending holes 61a drilled in the upper part of No. 2 frame (integrated upper and lower roll chocks) 81,
The upper taper sleeves 64, 84 and the upper and lower holes 61a, 81
a is formed with a lowering wedge 66, 86 having a taper at the same angle as the upper taper sleeve 64, 84 in the roll axis direction.
Are interposed slidably in the roll axis direction.

The rod portions of the pressing cylinders 68 and 88 buried above the No. 1 frame 61 and the No. 2 frame 81 are fixed to the projections above the both pressing wedges 66 and 86, respectively. . The two upper bearing blocks 62, 82 are connected to both lifting cylinders 70, 90.
Thus, it is always suspended above the No. 1 frame 61 and the No. 2 frame 81, respectively.

On the lower surfaces of the lower bearing blocks 63, 83, a lower taper sleeve 65, which is formed with a taper in the roll axis direction.
85 are mounted respectively. Then, both lower bearing blocks 63 and 83 and lower taper sleeves 65 and 85
The lower taper sleeves 65 and 85 are fitted to the lower elevating holes 61b and 81b respectively formed in the lower portions of the No. 1 frame 61 and the No. 2 frame 81 so as to be vertically movable. Height adjusting wedges 67, 87 having tapered at the same angle as the lower tapered sleeves 65, 85 in the roll axis direction are interposed between the elevating holes 61b, 81b so as to be slidable in the roll axis direction. The rod portions of the height adjusting cylinders 69 and 89 buried under the No. 1 frame 61 and the No. 2 frame 81 are fixed to the projections below the height adjusting wedges 67 and 87, respectively.

Upper work roll 1 and lower work roll 2
Is connected to a drive device via a universal joint (not shown). The No. 1 frame 61 and the No. 2 frame 81 are closely adhered to each other by the base block 99 and are arranged close to each other.

A No. 1 wedge type two-high rolling mill 60 and a No. 2 wedge type two-high rolling mill 80 are constituted by these members and devices, and are erected close to the base block 99.

In this embodiment, two wedge type two-high rolling mills 60 and 80 are erected close to each other, but even one can be used, and if the base block 99 is enlarged,
Any number of the wedge type two-high rolling mills 60 and 80 can be added.

[Operation and Effect] Both height adjusting cylinders 6
9 and 89, the height adjusting wedges 67 and 87 are respectively slid in the roll axis direction, and both lower bearing blocks 6
3 and 83 are raised and lowered respectively, and both lower work rolls 2
Of the upper bearing blocks 62, 86 by sliding the pressing wedges 66, 86 in the roll axis direction by the pressing cylinders 68, 88, respectively.
82, the height of both upper work rolls 1 is adjusted to set the required roll gaps, and the water 111 supplied to the header 5 is sprayed by the spray nozzle 6 on the upper and lower work rolls 1, 2. The upper work roll 1 and the lower work roll 2 are driven to rotate while being sprayed on the surface.

Next, the conveyed slab 100 is engaged in the upstream roll gap and rolled, and the slab 100 is engaged in the downstream roll gap and the sheet bar before hot finish rolling is performed. Hot rough rolling to 100a.

At the time of this rolling, a large number of dimples 1 provided on the outer peripheral surfaces of the upper work roll 1 and the lower work roll 2
The water 111 injected from the spray nozzle 6 is confined in the a and 2a, and the water 111 is introduced into the contact arc with the slab 100 to form a lubricating film. The rolling friction and rolling torque are reduced as a result.

If the thickness of the slab 100 fluctuates during rolling, the two pressing cylinders 68 and 88 cause the two pressing wedges 66 and 86 to slide in the roll axis direction, respectively, so that both upper bearing blocks 62 and 82 and The upper work roll 1 is finely moved up and down to finely adjust both the roll gaps, and the sheet bar 10 to be rolled is adjusted.
The thickness of 0a is kept constant.

In this embodiment, the upper work roll 1
And the use of high-speed steel for the material of the barrel portion of the lower work roll 2 reduces its wear and reduces dimples 1a,
The shape of the sheet bar 100a can be obtained satisfactorily while maintaining the shape of the sheet bar 2a.

The upper bearing blocks 62 and 82 and the upper work roll 1 are always constantly lifted by the lifting cylinders 70 and 90, but the upper bearing block 6 is not used.
A lifting wedge is interposed between the lower surfaces of the upper and lower bearing blocks 62, 82 and the lifting holes 61a, 81a, respectively. It can be raised and lowered.

Further, in the present embodiment, similar to the first embodiment, an example in which the slab 100 is hot rough-rolled to the sheet bar 100a is described. However, in the present invention, the sheet bar 100a is finish-rolled into the strip 100c. it is also applicable to the finishing mill final stand other than finishing rolling mill F ₁ to F ₆ columns.

The present invention is not limited to the above embodiments,
Various changes can be made without departing from the spirit of the present invention.

[0067]

The present invention has the following effects. (1) In claim 1, the upper work roll and the lower work roll having a large number of dimples formed on the outer peripheral surface of the barrel portion, and the liquid ejecting means opposed to the upper work roll and the lower work roll are provided. The liquid ejected by the liquid ejecting means is confined in the dimples of the upper and lower work rolls when the rolled material is rolled, and the boiling pressure is increased, and a good lubricant is obtained. Becomes possible. Therefore, the rolling load and the rolling torque are reduced, and the rolling mill can be made compact. In addition, the use of high-speed steel for the material of the upper and lower work rolls reduces the wear of the high-speed work rolls, so that the shape of the dimple can be favorably maintained and a high-quality rolled material can be obtained.

(2) In the second aspect, in addition to the effect of the first aspect, at least two sets of upper work rolls and lower work rolls are respectively provided near the housing, so that the upper and lower work rolls on the upstream side can be used. The hot-rolled material can be re-rolled by the upper and lower work rolls on the downstream side in a short time, reducing the temperature drop of the rolled material, reducing the scale generated in the rolled material, and meandering the rolled material. Can be reduced.

(3) According to the third aspect, in addition to the effect of the first aspect, the upper work roll and the lower work roll are raised and lowered by the rotation of the vertical eccentric bush, so that the housing is omitted and the rolling mill is further compacted. Can be

(4) In claim 4, in addition to the effect of claim 3, by arranging at least two eccentric bush type hot two-high rolling mills close to each other, the upper and lower work rolls on the upstream side are used for heat transfer. It is possible to re-roll the rolled material by the upper and lower work rolls on the downstream side in a short time, reduce the temperature drop of the rolled material, reduce the scale generated in the rolled material, and reduce the meandering of the rolled material. Can be smaller.

(5) In the fifth aspect, in addition to the effect of the first aspect, the housing is omitted by raising and lowering the upper work roll and the lower work roll by moving the pressing down wedge and the height adjusting wedge in the roll axis direction. Thus, the rolling mill can be made more compact.

(6) In claim 6, in addition to the effect of claim 5, by arranging at least two wedge type hot two-high rolling mills close to each other, the hot work can be performed by the upper and lower work rolls on the upstream side. It is possible to re-roll the rolled material with the upper and lower work rolls on the downstream side in a short time, reduce the temperature drop of the rolled material, reduce the scale generated in the rolled material, and reduce the meander of the rolled material. can do.

[Brief description of the drawings]

FIG. 1 is a side view of a hot two-high rolling mill as a first embodiment of the present invention, in which a central portion in a roll axis direction is broken in a longitudinal direction.

FIG. 2 is a view taken in the direction of arrows II-II in FIG.

FIG. 3 is a schematic configuration diagram of a hot rolling facility.

FIG. 4 is a side view of a twin work roll type hot two-high rolling mill as a second embodiment of the present invention, in which a central portion in a roll axis direction is broken in a longitudinal direction.

FIG. 5 is a side view in which one side of a frame of an eccentric bush type hot two-high rolling mill as a third embodiment of the present invention is broken.

FIG. 6 is a side view in which one side of a frame of a wedge type hot two-high rolling mill as a fourth embodiment of the present invention is broken.

FIG. 7 is a side view of a conventional hot two-high rolling mill in which a central portion in a roll axis direction is broken in a longitudinal direction.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper work roll 1a, 2a Dimple 2 Lower work roll 3,13,23 Upper bearing box 4,14,24 Lower bearing box 5 Header 6 Spray nozzle 7,17,27 Reduction screw 8,18,28 Reduction cylinder 9,19 , 29 Height adjusting cylinder 10,20 Housing 40 No.1 eccentric bush type two-high rolling mill 31 No.1 frame 32,42 Upper eccentric bush 33,43 Lower eccentric bush 34,44 Upper worm wheel 35,45 Lower worm wheel 36,46 Upper worm 37,47 Lower worm 38,48 Upper motor 39,49 Lower motor 41 No.2 frame 50 No.2 Eccentric bush type two-high rolling mill 60 No.1 Wedge type two-high rolling mill 61 No.1 Frames 61a, 81a Elevating holes 61b, 81b Lower elevating holes 62, 82 Upper bearing blocks 63, 83 Lower bearing blocks 66,86 Reduction wedge 67,87 Height adjustment wedge 68,88 Reduction cylinder 69,89 Height adjustment cylinder 80 No.2 wedge type two-high rolling mill 81 No.2 frame 100 Slab 100a Sheet bar 100c Strip 111 Water

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masaji Yoshikawa 4-2-2 Kannon Shinmachi, Nishi-ku, Hiroshima-shi, Hiroshima In the Hiroshima Research Laboratory of Mitsubishi Heavy Industries, Ltd.

Claims (6)

[Claims] 1. A two-high rolling mill for hot-rolling a rolled material, wherein the two-high rolling mill uses a high-speed tool steel as a material for a barrel portion and has a large number of dimples provided on an outer peripheral surface thereof. A hot rolling facility comprising: a work roll and a lower work roll; and liquid ejecting means facing the upper and lower work rolls. 2. A two-high rolling mill for hot-rolling a rolled material, the two-high rolling mill comprising an upper bearing box and a lower bearing box each having at least two sets of upper work rolls and lower work rolls axially mounted thereon. A two-high rolling mill provided with an upper work roll elevating means and a lower work roll elevating means, each of which is provided inside the housing so as to be able to ascend and descend in proximity to the housing. A hot work roll, comprising: an upper work roll and a lower work roll provided with a large number of dimples; and liquid ejecting means opposed to the upper work roll and the lower work roll. 3. A two-high rolling mill for hot-rolling a rolled material, wherein the two-high rolling mill rotates an upper eccentric bush and a lower eccentric bush on which an upper work roll and a lower work roll are respectively mounted. Freely support each,
This is a two-high rolling mill provided with eccentric bush rotating means for the upper eccentric bush and the lower eccentric bush, and using a high-speed tool steel for a material of a barrel portion and providing a large number of dimples on an outer peripheral surface thereof. Roll and lower work roll,
A hot rolling facility comprising a liquid ejecting means facing the upper work roll and the lower work roll. 4. A hot rolling plant comprising at least two two-high rolling mills according to claim 3, which are arranged close to each other. 5. A two-high rolling mill for hot-rolling a rolled material, wherein the two-high rolling mill has an upper bearing block and a lower bearing block in which an upper work roll and a lower work roll are respectively mounted on a frame. The lower bearing block is supported by the upper bearing block elevating hole and the lower bearing block elevating hole, and the lower bearing block is provided with a lowering wedge having a roll axis direction inclined between the upper surface of the upper bearing block and the upper bearing block elevating hole. A height adjusting wedge provided with an inclination in the roll axis direction on a lower surface of the lower bearing block and a lower bearing block elevating hole, and a two-high rolling mill provided with wedge moving means on the pressing wedge and the height adjusting wedge, An upper work roll and a lower work roll, each of which uses a high-speed tool steel as a material for the barrel and has a large number of dimples on its outer peripheral surface, and an upper work roll and a lower work roll. A hot rolling facility comprising a liquid jet means facing the crawl. 6. A hot rolling plant comprising at least two two-high rolling mills according to claim 5, which are arranged close to each other.