JP2798024B2 - Hot rolling equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot strip rolling equipment for producing a thin sheet product by reducing the thickness of a hot slab material, and more particularly, to a winding roll provided at an inlet and an outlet of a rolling mill. Related to the dispensing machine.

[0002]

2. Description of the Related Art As disclosed in JP-A-59-101205, a winding machine with a furnace is provided on the inlet and outlet sides of a rolling mill, and a rolled material is hot rolled while being repeatedly wound and unwound. The rolling method called hot rolling equipment enables rolling to a product thickness with a small number of rolling mills. Therefore, compared with the usual tandem hot strip mill equipment consisting of six or seven units,
Economical production is possible with extremely cheap equipment.

[0003]

As described above, the hot rolling equipment can perform hot reduction rolling from the raw material to the product thickness with a small number of rolling mill stands. However, the furnace-equipped winder provided on the entrance and exit of the rolling mill, which is a feature of the present facility, has the following disadvantages.

That is, as shown in JP-A-59-101205, in a conventional winder equipped with a furnace, a winding cylinder is disposed in a heating furnace, and a rolled material is wound into a coil on the winding cylinder. And rewind. However, the temperature of the hot rolled material is as high as about 1000 ° C. in the typical rolling of steel materials. Therefore, at least the winding cylinder should always keep the rolled material cool.
It needs to be heated to a high temperature of about 900 ° C. on the other hand,
The thickness of the rolled material wound on the winding cylinder is as thick as about 20 mm near the first pass where the thickness of the sheet is large, and the sheet width is as wide as 1600 mm at the maximum. Accordingly, the diameter of the winding cylinder is usually designed to be a large diameter of about φ1200 mm, and the inside thereof is water-cooled. As described above, since the drum is thick and the inside is water-cooled, enormous heat energy is required for heating the drum. Furthermore, since the winding cylinder is maintained at a high temperature such as 900 ° C., it is made of expensive heat-resistant steel,
Often, thermal cracks occur and have a short life. Therefore, the winding cylinder needs to be replaced in a short period of time, which is a major cause of an increase in the unit consumption of the product. Also, in order to start winding the rolled material on the winding cylinder, a bite for the rolled material is provided,
It takes a long time to guide the rolled material to this, and there is also a problem that the temperature of the hot rolled material is lowered.

Further, when a thin plate having a small thickness and a high temperature is actually wound into a coil shape by a bending roller, the coil is often deformed into an elliptical shape, and a coiled shape having many gaps between the coil layers. It turned out that the coil could not be used, or the winding work could not be performed smoothly, and an accident that had to be stopped was caused. This tendency is remarkable in the case of a sheet thickness of 3 mm or less in the case of a hot ordinary steel material.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned points, and an object of the present invention is to provide a reversible rolling mill provided with a winding machine provided on an entrance side or an entrance side and an exit side in a reversible rolling mill. Winding or winding so that the thin plate does not deform into an elliptical shape
Returned, and performs a smooth small winding operation of temperature drop of the sheet, thereby preventing the stopping of the rolling operation by failure of the winding, the winding of the two rolls bending rollers arranged on the lower side of the thin plate Or, by having an elevating mechanism that can be reciprocally moved to the unwinding height position and the passing plate height position of the thin sheet material, it guides the passage and winding or winding of the thin sheet material
Switching of rewinding , winding or rewinding and sheet material
It is an object of the present invention to provide a hot strip rolling facility capable of performing reversible rolling by allowing both of passing and passing .

[0007]

SUMMARY OF THE INVENTION The hot rolling equipment of the present invention rewinds at least at the entrance side of the entrance side and the exit side of the rolling mill.
A dual-purpose winding machine is provided to repeatedly wind thin sheet materials hot.
A hot rolling facility for rolling while returning, wherein the rolling mill
Is a reversible rolling mill, the winder does not have a winding cylinder
A roll bending roller type winding mechanism is provided,
The winding mechanism is composed of the first, second and third roll bending rollers.
Roller and the first roll bending roller
Is disposed above the sheet material, and the second and third roll
A binding roller is disposed below the sheet material, and
The second and the second so that the passage of the sheet material can be guided.
Roll winding roller or rewind height
Height that can be reciprocally moved to the height position and the threading height position of the sheet material.
A lowering mechanism is provided .

[0008] The hot rolling equipment according to the present invention is provided at the entrance of a rolling mill.
A rewinding / winding machine is installed on at least the
And roll the sheet while repeatedly winding and unwinding it hot.
A hot rolling facility, wherein the rolling mill is a reversible rolling mill.
Roll bending wherein the winder does not have a winding cylinder
It has a roller type winding mechanism, and the winding mechanism is a first and a second.
Having second and third roll bending rollers, and
The first roll bending roller is positioned above the sheet material.
And the second and third roll bending rollers are
The second and third rows are disposed below the sheet material.
Rewinding roller at the take-up or rewind height position
And a passing plate height position at which the guiding of the passage of the thin plate material is enabled.
Is provided with an elevating mechanism that can move each other .

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS.

In FIG. 1, for example, a raw material made of low carbon steel is manufactured by a continuous casting machine.

That is, the molten metal from the tundish 1 is poured into the mold 3 through the nozzle 2 and the poured molten metal 4 is cooled, whereby the cast slab 5 is continuously produced. With such a continuous caster, slabs 5 of various dimensions are manufactured. A typical example will be described in which a relatively thin 80 mm thick slab 5 is manufactured. The width of the slab 5 is about 700 to 1300 mm, and the casting speed is 2 to 5 m / min.

Next, the continuous cast piece 5 is cut into a predetermined length by a shearing machine 6. If the product weight is about 15 kg / mm per unit width, it is cut to a length of 20 to 30 m.

The shearing machine 6 has upper and lower blades 11a and 11b provided on a tool post 9 and 10, respectively. The slab 7 is obtained by lowering the upper blade 11a under the pressure of the cylinder 8 to cut the slab 5. During cutting of the slab 5, the shearing machine 6 is fed by the cylinder 13 with the pin 6a as a fulcrum in the slab advancing direction in synchronization with the speed of the slab 5 to perform the cutting operation.

The sheared slab 7 is conveyed by a table roller 15 in a furnace 14. In the furnace 14, in addition to preventing heat radiation from the slab 7, the slab 7 may be heated by supplying heating energy as needed.

The slab 7 is then subjected to forward and reverse rolling by a reversible rough rolling mill 24.

In this figure, a four-high rolling mill having a pair of work rolls and a pair of reinforcing rolls is used for the reversible rolling mill. Of course, a two-high rolling mill or a six-high rolling mill may be used depending on the purpose. You may.

In this embodiment, a rolled material bending roller device comprising a total of three rollers, two lower bending rollers 19 and one upper bending roller 21, is provided on the input side of the reversible rough rolling mill 24, and a coil support. A winding device 65 as a winding means constituted by the roller 22 is provided.

As described above, coil winding is performed by a three-roll bending roller type winding machine without a winding cylinder. Since there is no take-up cylinder, the contact portion between the plate and the take-up device can be reduced, and a decrease in the temperature of the plate due to the take-up cylinder can be prevented. Further, by the three-roll bending roller system, the thin plate can be wound so as not to be deformed into an elliptical shape, and a smooth winding operation can be performed, and the stop of the rolling operation due to a winding failure can be prevented. .

In the forward pass of the first pass, the lower bending roller 19 moves up and down around a fulcrum 60 provided on the bracket 17 together with the frame 61 and the guide plate 20 supporting these rollers 19. The roller 18 is rotated by a cylinder 18 serving as an elevating mechanism, and is lowered to a standby position shown in FIG.

In order to prevent the rolled material from cooling down due to heat radiation during the first pass forward pass rolling, a heat dissipation prevention furnace 25 is provided on the exit side of the rough rolling mill 24. A table roller 26 is also provided in the furnace 25 to carry the rolled material 27. The plate thickness is reduced to about 52 mm by the first forward pass rolling. During the forward pass rolling, the rough rolling mill 24 is on the entry side (meaning of the entry side in the case of the positive pass) and the exit side (meaning of the exit side in the case of the positive pass), and is above and below the rolling material moving path. High-pressure water of about 150 kg / cm ² is sprayed onto both surfaces of the rolled material 27 from a pair of nozzles 90 and 91 provided, and descaling for blowing off the scale on the surface of the rolled material 27 is performed.

After the first forward pass is completed, reverse pass rolling is performed according to FIG. In this pass, the rolled material 27 is reduced in thickness so that its thickness becomes about 52 mm to 25 mm.

In the reverse pass rolling of FIG. 2, the lower bending roller 19 and the guide plate 20 are moved upward by the cylinder 18 as shown in FIG. 2, that is, at a position for winding the rolled material 27 after the reverse pass rolling. Lifted up.

The rolled material 27 is fed in the reverse direction, rolled by the rough rolling mill 24, and the rolled plate 27 is bent by the lower bending roller 19 and the upper bending roller 21 into an arc or a coil while forming an arrow. It is sent in the direction B to form the coil 23. This coil 23 is supported by a coil support roller 22. Also in this reverse pass rolling, deskering is performed via the nozzles 90 and 91.

After the above-described reverse pass rolling is completed, the final pass forward pass rolling is performed as shown in FIG.

The coil 23 is unwound by a rough rolling mill 24,
Finish rolling is performed on the thinned material 31 after the rolling by the finish rolling mill 28 simultaneously with the final rough rolling, and a hot thin product 32 is obtained. The sheet is fed in the direction of the arrow, guided by the guide roller 29, and wound around the winding cylinder 46 to obtain a product coil. At this stage, descaling is performed not only with the nozzles 90 and 91 but also with the high-pressure water from the nozzle 92. In addition, since the rolled material passes between the three rolling stands of the finishing mill 28 in a short time, deskelting is not necessary.

The deskelting in the hot strip rolling equipment is as follows.
Since the descaling is performed in a state where the sheet thickness is large in both the rough rolling and the finish rolling, a decrease in the temperature of the rolled material can be significantly suppressed. In FIG. 3, three finishing mills are arranged, but the number may be increased or decreased depending on the thickness of the product.

For example, the thickness of a plate 31 obtained after rolling in the final pass of the rough rolling mill 24 is about 12 mm, and a rolled plate product 32 having a typical thickness of 2.5 mm is formed from the rolled material 31 by finish rolling. In order to obtain it, three finishing mills may be arranged.

The rolling speed is about 75 m / min for the rough rolling mill and about 360 m / min for the final finishing rolling mill.

In the above description, an example in which the material slab having a thickness of 80 mm is rolled by the reversible rolling mill 24 has been described. However, the slab 7 having a thickness greater than 80 mm is subjected to rough rolling in more than three rolling passes. You may.

The winding means of the present invention is effective not only in a rough rolling mill but also in a finishing rolling mill.

For example, if the thickness of the slab 7 is 120 mm, it may be rolled to 100 mm in the first forward pass and to 80 mm in the second reverse pass.

However, (from a thickness of 100 mm to 80 mm)
In the first reverse pass rolling, since the rolled material obtained after rolling has a large plate thickness and a short plate length, the amount of heat radiation can be neglected, so that the winding by the winder 65 is not performed. Usually, the weight per unit width is the same irrespective of the slab material thickness, so the larger the slab thickness, the shorter the plate length.

After the above rolling, the sheet thickness is from 120 mm to 80 mm
Then, rolling may be performed by the same process as described above.

Even when the thickness of the slab 7 is further increased, the winding is not performed until the thickness of the slab 7 becomes about 30 mm, and the reversible rolling is simply performed to reduce the thickness.

Then, when the sheet thickness becomes about 30 mm, the sheet is wound up by the entry-side winder 65 and then rolled in the same manner as described above.

Further, by providing a plurality of reversible rolling mills for rolling a sheet material, the sheet material to be rolled is wound in a thick state, so that stable winding can be always performed.

The winder 65 on the entry side of the rough rolling mill shown in the above-described explanatory drawing is an example of an up-coiler type winder that winds up from below.

As described above, it is desirable to use an up-winding up coiler type winder as the three-roller bending roller type coil winder. As a result, the plate material can be wound while maintaining its rigidity, so that more stable winding can be performed even when a plurality of reversible rolling mills are used.

As the upper winding type, it is appropriate to use a method in which three roll bending rollers have two lower rollers and one upper roller.

However, the winder 65 may be of a type using a drum, or of a variety of types such as a type that winds up from below like a Steleco (registered trademark) system.

FIG. 4 shows another embodiment used when the thickness of the slab is larger than 80 mm, for example, 110 to 220 mm. That is, the rolling equipment of FIG. 4 has two reversible rough rolling mills 35 and 36 (of course, two or more can be installed), and a total of three directions of forward, reverse and final forward directions. Is used to obtain a larger rolling reduction by rolling. By this forward / reverse forward rolling, rolling of a total of 6 passes is performed. The thickness of the slab 7 is 12
If it is 0 mm, the rolling can be reduced to a rolled material having a thickness of about 6 to 10 mm by the rolling of 6 passes. Then, the final rough rolling pass is performed continuously with the finish rolling 28, and the sheet thickness is 1.7 to 2.5.
mm products can be manufactured.

The rough rolling mills 35, 35 used in FIG.
The coil 23 of the winder 65 disposed on the entry side of the coil 36 is covered by a heat retaining box 70 as a heat retaining means to prevent heat dissipation from the coil.

Thus, by providing a plurality of rough rolling mills, a thin plate can be manufactured stably.

In FIG. 4, the lower bending roller 19
Although not shown, the same mechanism as that shown in FIG. 1 is used.

FIG. 5 shows another preferred embodiment of the hot strip rolling equipment according to the present invention.

That is, in this case, the reversible rough rolling mill 3
5, the rewinding / winding machine 71,
72, and also winds up with the winder 72 during the normal pass,
The heat radiation from the rolled material is prevented. And
The plate after rough rolling to a predetermined plate thickness is then rolled by a finishing mill 38 as shown by a dashed line, thereby producing a hot thin product.

When the winding machines 71 and 72 are provided on both the entrance side and the exit side of the rough rolling mill 35 as shown in FIG.
The plate thickness in the rough rolling mill 35 can be further reduced. An example of the rolling is shown below.

From a slab having a large thickness to a rough rolling roll 35
When the sheet (rolled material) is repeatedly rolled to a thickness of about 30 mm, the sheet (rolled material) is wound up by the winding machine 71 on the entry side for the first time.

Then, the rolled material is rolled to about 17 mm in the next positive pass, and wound up by the winder 72 on the exit side of the rough rolling roll 35.

Further, the rolled material is 9 mm in the next reverse rolling pass.
In the final rough pass, the roll is rolled to about 6.5 mm while being rewound from the winder 71. At this time, the rough rolling mill 35 is interlocked with the finishing rolling mill 28, and the rolled material discharged from the rough rolling mill 35 is immediately sent to the finishing rolling mill 28, and is rolled by the finishing rolling mill 28 to have a thickness of about 2.0 mm. The product is obtained.

In this rolling equipment, the rough rolling mill 35 and the finish rolling mill 28 are close to each other so as to reduce heat radiation from the rolled material when the rolled material travels between the rough rolling mill 35 and the finishing rolling mill 28. It is arranged.

When the rough rolling is performed without winding by the winding machine 72, the rolled material may reach the finish rolling mill 28. In this case, the upper and lower rolls of the finishing rolling mill 28 The gap between them is widened so that the rolled material can freely enter and leave the gap. Thus, the overall length of the installation can be further reduced.

FIG. 6 shows another example of the finish rolling equipment used in the hot sheet rolling equipment. In this figure, one finishing mill 37 is arranged, which operates reversibly. Of course, the number of rolling mills may be plural or more.

The coiling and rewinding machines 80 and 81 are provided before and after the finishing mill 37. The rolled material 27 after the rough rolling is first subjected to a positive pass rolling by a finishing mill 37, and a coil 44 is wound on a winding drum 45 by a pinch roller 42.
It is wound up. Next, rolling in a reverse pass is performed, and the rolled material is wound as a coil 39 on a drum 40 by a pinch roller 41. After being repeatedly rolled to a predetermined thickness in this way, the final roll is sent to the guide roller 29 side as indicated by a dashed line while being rolled in a forward pass, and wound around the drum 46 like the product coil 30. .

The coils 39 and 44 of the winding machine provided before and after the finishing mill 37 are provided in the box 3 in view of heat insulation.
8, 43.

In this embodiment, the three-roll bending without the winding cylinder capable of winding and unwinding the rolled material on the entrance side or the entrance side and the exit side of the reversible rolling mill is provided. The following effects were obtained by disposing the roller type winder.

1. By using a three-roll bending roller type winding machine without a winding cylinder, the thin plate can be wound by the winding machine so as not to be deformed into an elliptical shape, and a smooth winding operation can be performed. In addition, it is possible to prevent the rolling operation from being stopped due to a winding failure. 2. By winding the plate material after the reverse pass in the reversing rolling mill of the rough rolling mill or the finishing rolling mill, a long table equipment to the rough rolling mill entrance side for developing the rolled material after the reverse pass becomes unnecessary, Space and equipment costs can be saved.

3. The rolled material after the reverse pass in the reversing rolling mill of the rough rolling mill or the finish rolling mill is radiated from the rolled material surface during the rolling in the reverse pass and the rolling period in the next forward pass (in the case of the prior art). However, as in the present invention, the heat is reduced and the temperature of the rolled material can be prevented from being lowered by winding it into a coil by the three-roll bending roller method. In the case of the related art, when the rolled material is spread on the table roller, the temperature is lowered twice per second. It takes about 60 seconds until the reverse pass rolling and the next forward pass rolling are completed, so that the temperature drops by about 120 degrees in total. Therefore, in the prior art, it was necessary to raise the initial temperature of the material slab by the amount of the temperature decrease.

On the other hand, in the case of the present invention, since the rolled material is wound around the coil material, the temperature drop per second is not more than 0.2 ° C., and the temperature drop of the rolled material is negligible. Energy saving effect was obtained.

4. By arranging the winders on both the entrance side and the exit side of the rough reversible rolling mill, the thickness of the plate (rolled material) obtained by rolling with the rough rolling mill can be made thinner. , The number of finishing stands provided after that can be reduced to about half or less.

[0061]

According to the present invention, the winding machine provided on the entry side or the entry side and the exit side of the reversible rolling mill is a winding roller type winding so that the reversing rolling mill can be inserted in the reversible rolling of a thin plate. in winding machine provided on the side or entry side and delivery side, the winding also so as not to deform the thin elliptically
Rewinds, and, smooth temperature drop less winding operation can be performed, an effect that the stopping of the rolling operation by failure of the winding can be prevented.

Further, there is provided an elevating mechanism capable of mutually moving the two roll bending rollers disposed below the thin sheet material to a take-up or rewind height position and a passing plate height position of the thin sheet material. Guides and winds up the passage of thin sheets
Or switch the rewind to take up or rewind
An effect of enabling reversible rolling by allowing both the passage of the sheet material is achieved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a normal pass rolling state by the hot thin plate rolling equipment of the present invention.

FIG. 2 is a cross-sectional view showing a reverse pass rolling state by the hot thin plate rolling equipment of the present invention.

FIG. 3 is a cross-sectional view showing a final positive pass rolling state by the hot thin plate rolling equipment of the present invention.

FIG. 4 is a cross-sectional view showing a rolling state of a hot sheet rolling facility using two rough rolling mills.

FIG. 5 is a cross-sectional view of a hot thin-plate rolling facility in a case where a winder is arranged on an entrance side and an exit side of a rough rolling mill.

FIG. 6 is a cross-sectional view of a hot sheet rolling facility when a reversible rolling mill is used for finish rolling.

[Explanation of symbols]

3 mold, 5 slab, 6 shearing machine, 7 slab, 19,
21 ... bending roller, 24, 35, 36 ... reversible rough rolling mill, 25 ... heat dissipation prevention furnace, 27 ... rolled material, 28, 37
... Finishing rolling machine, 29 ... Guide roller, 32 ... Rolled plate product, 46 ... Drum, 65,72 ... Winding machine, 70 ... Heat keeping box, 71,80,81 ... Rewinding / winding machine, 9
0, 91 ... nozzle.

Claims (4)

(57) [Claims] At least one of an inlet side and an outlet side of a rolling mill.
A hot-rolling facility that provides a rewinding / winding machine on the side , and repeatedly rolls the thin sheet material while hot rolling and rewinding, wherein the rolling mill is a reversible rolling mill, and the winding machine is A winding mechanism of a roll bending roller type without a winding cylinder, wherein the winding mechanism has first, second and third roll bending rollers ;
Arranged Gurora the upper side of the sheet material, said second and third
A roll bending roller is arranged below the thin plate material ,
Further, the second sheet material is guided so as to be able to guide the passage of the thin sheet material.
The second and third roll bending roller, the winding or
Hot rolling equipment and providing a mutual movable lifting mechanism and passing plate height position of the height position and the thin plate material rewinding. 2. A hot-rolling facility for providing a rewinding / winding machine on at least an entrance side of an entrance side and an exit side of a rolling mill, and for rolling a thin sheet material while repeatedly winding and rewinding hot. The rolling mill is a reversible rolling mill, and the winding machine includes a winding mechanism of a roll bending roller type having no winding cylinder, and the winding mechanism includes first, second, and third roll bending. Having a roller, and disposing the first roll bending roller above the sheet material, disposing the second and third roll bending rollers below the sheet material,
Further, the second and third roll bending rollers are
A hot rolling facility comprising a lifting mechanism capable of moving relative to a winding or rewinding height position and a passing plate height position at which the sheet material can be guided to pass. 3. The hot rolling equipment according to claim 1, wherein a plurality of said reversible rolling mills are provided. 4. The hot rolling plant according to claim 3, wherein
A hot rolling facility, wherein the winding machine is an up-coiler of an upper winding type.