JP3335540B2 - Steckel mill 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 Steckel mill rolling plant, and more particularly to a Steckel mill rolling plant suitable for preventing a decrease in temperature of a rolled material, improving product quality and improving productivity.

[0002]

2. Description of the Related Art A conventional Steckel mill rolling equipment used for hot finish rolling is described in "Handbook of Latest Plastic Working, No. 146.
Page, Fig. 1, Types of mills, ii) Steckel mill "
As described in (Japan Society for Technology of Plasticity, issued in August 1986), the hot rolling mill is provided with a furnace coiler on the entrance and exit sides, and further with a table roller and the like.
In particular, in the furnace coiler, a burner that emits a flame in a tangential direction of the steel strip coil is provided to heat the steel strip coil so that the furnace air is stirred in the circumferential direction of the steel strip coil.
Then, the reversible rolling of the steel strip is performed while repeating the rolling in the hot rolling mill and the winding in the furnace coiler.

[0003]

However, during rolling, the temperature of the end of the strip in the sheet width direction is more likely to be lower than that of the center. The furnace coiler installed in the above-mentioned prior art Steckel mill rolling equipment has burners arranged in a tangential direction so that the inside of the furnace can be uniformly heated. However, it was difficult to recover the temperature at the end in the sheet width direction where the temperature was lowered within a short time before the start of rolling. For this reason, the material temperature of the strip in the sheet width direction becomes non-uniform, which causes deterioration in sheet thickness accuracy and sheet shape.

In the furnace coiler of the prior art, a burner is arranged only in the tangential direction of the steel strip coil and the furnace air is stirred in the circumferential direction of the steel strip coil. It was necessary to ensure a sufficient space between the furnace and the furnace inner wall, the furnace body size was increased, and the space between the hot rolling mill and the furnace coiler was increased, so that a large installation space was required.

An object of the present invention is to recover the temperature of the end portion of a steel strip coil in a short time, to make the material temperature in the width direction uniform, and to improve the accuracy of the thickness and the shape of the plate. ,
It is another object of the present invention to provide a Steckel mill rolling plant in which the furnace body of the furnace coiler can be downsized to make the facility compact.

[0006]

According to the present invention, there is provided a hot rolling mill for performing reversible rolling,
A steckel mill for rolling the strip, comprising a furnace coiler provided with a mandrel provided on the inlet side and the outlet side of the hot rolling mill for winding the strip in a coil shape, and a roller table for passing the strip; In the rolling equipment, heating means for heating the furnace coiler inside to a high temperature, and heating the steel strip wound in a coil form from both end faces in the sheet width direction to prevent a temperature drop of the steel strip, A Steckel mill rolling facility provided on the furnace side wall of the furnace coiler is provided.

[0007] In the above Steckel mill rolling equipment, preferably, the heating means includes a plurality of heating means which are radially installed on the furnace side wall of the furnace coiler and emits flame from both end faces in the width direction of the strip to heat. Side burner.

In the present invention having the above-described structure, when rolling a strip, the bar material rolled by the upstream rough rolling mill is transferred to a hot rolling mill (finish rolling mill) capable of performing reversible rolling on a roller table. The strip which has been conveyed and has been subjected to the first pass rolling by the hot rolling mill is wound by one of the furnace coilers on the inlet side and the outlet side of the hot rolling mill. Rolling is performed while applying tension to the steel strip. After the rear end of the steel strip passes through, the second pass rolling is performed while the tension is applied by reversing the hot rolling mill and the furnace coiler. On the other furnace coiler. The furnace coiler has a built-in mandrel, and the steel strip is wound around the mandrel. The strip having a predetermined product thickness obtained by repeating forward and reverse rolling several times by a hot rolling mill is wound by a finishing winder or the like on the downstream side.

During the rolling as described above, since the temperature of the steel strip at the end in the sheet width direction is more likely to be lower than that at the center, the present invention not only heats the inside of the furnace coiler to a high temperature, but also Heating means for heating the steel strip from both end faces to prevent the temperature of the steel strip from decreasing is provided on the furnace side wall of the furnace coiler. When heating from both end surfaces of the steel strip coil during winding and unwinding of the steel strip by the furnace coiler by the heating means, heat from the heating means, for example, a flame from a side burner is supplied to the furnace of the furnace coiler. Spiral spreads along the side wall, and the strip steel coil is uniformly heated from both end faces to achieve a lowered temperature recovery.

Further, by heating the steel strip from both end faces by a heating means such as a side burner, a flame is emitted from a burner arranged only in a tangential direction of the steel strip coil, and furnace gas is stirred in a circumferential direction of the coil. The space between the outer diameter of the coil and the inner wall of the furnace of the furnace coiler can be reduced as compared with the conventional method. Therefore, the furnace body can be reduced in size, the interval between the hot rolling mill and the furnace coiler can be shortened, and the installation space can be small.

[0011] Further, the Steckel mill rolling equipment as described above further preferably includes, in addition to the heating means, at least one tangential heating means for emitting a flame in the circumferential direction of the coil of the steel strip and stirring the furnace gas. .

By combining such a tangential heating means (for example, a burner installed in the tangential direction) and a heating means for heating the steel strip from both end faces, it is possible to reduce the temperature recovery of both ends of the steel strip coil. Not only can this be achieved, but also the temperature uniformity of the furnace temperature can be further improved. In addition, since the above configuration is not a configuration in which the burners are arranged only in the tangential direction of the steel strip coil as in the related art, it is also possible to reduce the space between the outer diameter of the coil and the furnace inner wall of the furnace coiler, This is consistent with the downsizing of the furnace body and the shortening of the space between the hot rolling mill and the furnace coiler.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A Steckel mill rolling plant according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a diagram showing a configuration of a Steckel mill rolling facility of the present embodiment and a rolled state of a steel strip. The outline of the Steckel mill rolling facility will be described with reference to FIG. This Steckel mill rolling equipment includes a hot rolling mill 1 for performing reversible rolling of a strip 10, a furnace coiler 2 on an entrance side, a furnace coiler 3 on an exit side, an entrance roller table 4, an exit roller table 5, and an entrance side. A thickness gauge 6, an output thickness gauge 7, an input pinch roller 8, and an output pinch roller 9 are provided. Furnace coirers 2 and 3 located on the entrance side (left side in the figure) and the exit side (right side in the figure) of the hot rolling mill 1 rotate with a mandrel 11 for winding the rolled strip 10 and one end as a rotation axis. The deflector guide 12, the inside guide 13, the deflector roller 14, the upper furnace body 15, the lower furnace body 16,
A gantry 17 for supporting the upper and lower furnace bodies and three side burners 18 as heating means are provided.

When the reversible rolling of the steel strip is performed by the Steckel mill rolling equipment having the above configuration, the bar material rolled by the upstream rough rolling mill (not shown) is hot-rolled by the roller table 4 (finish rolling mill). It is transported to 1. The tip end of the strip 10 that has been subjected to the first pass rolling by the hot rolling mill 1 is conveyed by the roller table 5 and pressed by the output pinch roller 9, and the deflector guide 12 and the inside guide 1
While being guided by 3, it is fed into the furnace coiler 3 above the pass line of the roller table 5 and further passed through the meshing portion of the mandrel 11 in the furnace coiler 3. After the tip of the strip 10 meshes with the mandrel 11, the mandrel 11 is rotated clockwise in the figure in synchronization with the passing speed of the strip 10, and the strip 10 is wound around the mandrel 11. While winding the strip 10 as described above, the strip 10 is wound in a coil shape by the furnace coiler 3 while applying tension to the strip 10, and the rear end of the strip 10 is moved from the hot rolling mill 1. After trailing, the second pass rolling is performed by reversing the hot rolling mill 1 and the furnace coiler 3 on the delivery side.
The steel strip 10 is wound in a coil shape by the furnace coiler 2 on the input side in the same manner as described above. The furnace coiler 2 is shown in FIG.
Is shown as a coil 19.

The thickness of the strip 10 is measured by thickness gauges 6 and 7 installed on the entrance and exit sides of the hot rolling mill 1, respectively, so that the hot rolling mill 1 has a predetermined thickness. Is controlled to perform rolling. Further, pinch rollers 8 and 9 installed on the inlet and outlet sides of the hot rolling mill 1 press the rollers when the steel strip 10 is passed through the hot rolling mill 1, and during the winding and unwinding of the steel strip 10. The operation is performed with the upper roller opened.
The above-described forward / reverse rolling is repeated several times by the hot rolling mill 1 to obtain a predetermined product sheet thickness, and then the steel strip is wound into a coil by a finishing winder installed downstream, not shown.

FIG. 2 is an enlarged view of the furnace coiler 2 shown in FIG. 1, and FIG. 3 is a sectional view taken along the line III-III in FIG. As shown in FIGS. 2 and 3, the furnace coiler 2 is configured by combining an upper furnace body 15 and a lower furnace body 16, and the lower furnace body 16 has an opening A through which the steel strip 10 is put in and out. However, the upper furnace body 15 is provided with a chimney 20 for exhausting exhaust gas in the furnace. Further, the above-described side burner 18 is provided on the furnace side wall. The mandrel 11 is rotatably supported by a bearing 21, and the bearing 21 is fixed to the gantry 17. The bearing 21 is driven to rotate via a joint 22 by a driving device (not shown).

Fuel gas and fuel air are supplied to the side burner 18 from a separately installed fuel device, and the mixture is ignited at the tip of the side burner 18. The flame from the side burner 18 spreads spirally along the furnace side wall,
The coil 19 is heated at both end faces in the plate width direction. Upper furnace body 15
The lower furnace body 16 and the neck of the mandrel 11 are sealed by a seal member 23 so that the furnace gas does not go outside. The configuration of the furnace coiler 3 is exactly the same as the furnace coiler 2 described above. As the fuel, oil or the like can be used in addition to gas. Further, in the above description, three side burners 18 provided in the furnace coiler 2 or 3 are used. May be.

FIGS. 4 and 5 show the furnace coiler 2 on the entrance side.
5 is a diagram schematically showing a heating state of the coil 19 in the furnace of FIG. 5, and FIG. 5 is a cross-sectional view taken along a line VV in FIG. 4 and 5, the directions of the movement of the flame and heat from the side burner 18 are indicated by arrows. The flame discharged from the side burner 18 spirally spreads along the furnace side wall as shown in FIGS. 4 and 5, uniformly heats both end faces in the plate width direction of the coil 19, and most of the generated exhaust gas is a chimney. 2
0 and a part of the furnace gas blows out from the opening A for the steel strip 10.

According to the present embodiment as described above, the side burners 18 as heating means are connected to the furnace coils 2 and 3.
Since the steel strip 10 is provided on the side wall of the furnace and heated from both end faces thereof to prevent the temperature thereof from dropping, the steel strip 10 can be uniformly heated and the temperature can be recovered in a short time.
Therefore, the material temperature in the sheet width direction of the steel strip 10 can be made uniform to improve the accuracy of the sheet thickness and the shape of the sheet.

The outer diameter of the coil 19 and the furnace coilers 2 and 3 are different from those of the conventional method in which a flame is emitted from a burner arranged only in the tangential direction of the coil 19 to stir the furnace air in the circumferential direction of the coil. Since the space with the furnace inner wall can be reduced, the size of the furnace body can be reduced. For example, in an actual machine, the space between the outer diameter of the coil 19 and the inner walls of the furnaces 2 and 3 can be reduced by about 300 mm. Therefore, the interval between the hot rolling mill 1 and the furnace coils 2 and 3 can be reduced, and the equipment can be made more compact.

A Steckel mill rolling equipment according to a second embodiment of the present invention will be described with reference to FIGS. 6 and 7 are diagrams schematically showing a heating state of the coil in the furnace of the furnace coiler according to the present embodiment, and FIG. 7 is a cross-sectional view taken along the line VII-VII in FIG. The furnace coiler 2 on the entry side has two side burners 18 on the side wall, and further has one tangential burner 24 in the tangential direction of the coil 19. Except for this, the configuration of the Steckel mill rolling equipment is the same as that of the first embodiment, and the same reference numerals in FIGS. 6 and 7 denote the same members as in FIGS. 1 to 5. Also in the present embodiment, the configuration of the furnace coiler 3 on the output side is exactly the same as that of the furnace coiler 2 on the input side.

As shown in FIGS. 6 and 7, the flame from the side burner 18 spirally spreads along the furnace side wall to uniformly heat both end faces in the plate width direction of the coil 19, and further from the tangential burner 24. The flame spreads in the circumferential direction of the coil 19 to further improve the uniformity of the furnace temperature.

FIG. 8 shows the coil 19 shown in FIGS.
FIG. 4 is a diagram schematically showing a heating direction and a heat input effect to a coil 19. In the method of heating from the coil end face direction S (the above-described side burner 18), heat can be directly input from the end face of the coil 19, so that the temperature of the end portion of the strip 10 in the sheet width direction whose temperature has decreased can be recovered, and It is also excellent in the heat transfer effect to the central part of the plate width. As for the method of heating from the tangential direction T of the coil 19 (the tangential burner 24 described above),
Since there is an air layer between the layers of the steel strip 10 in the coil 19 and heat transfer is difficult, it takes some time to recover the temperature at the end in the sheet width direction. This has the effect of making the temperature even more uniform. That is, the present embodiment is a combination of the method of heating from the end face direction S of the coil 19 shown in the first embodiment and the method of heating from the tangential direction T of the coil 19. However, the total number of the burners is three, which is the same as the number of the side burners 18 in the first embodiment. However, in the present embodiment, the total number of the side burners 18 and the tangential burners 24 is not limited to three. good.

According to the above-described embodiment, the strip steel 10 can be uniformly heated by the side burners 18 and the temperature can be recovered in a short time. In addition, the tangential burners 24 are provided. In addition, the temperature uniformity in the furnace can be further improved. Further, in the present embodiment, the burner is not disposed only in the tangential direction of the coil 19 as in the related art, so that the space between the outer diameter of the coil 19 and the inner walls of the furnaces of the furnace coils 2 and 3 is also reduced. This is consistent with downsizing of the furnace body and shortening of the interval between the hot rolling mill 1 and the furnace coils 2 and 3.

[0025]

According to the present invention, since the heating means is provided on the furnace side wall of the furnace coiler, the steel strip can be uniformly heated, and the temperature can be recovered in a short time. Therefore, the material temperature of the strip in the sheet width direction can be made uniform, and a product excellent in sheet thickness accuracy and sheet shape can be produced with high efficiency.

Further, since the space between the outer diameter of the coil and the inner wall of the furnace of the furnace coiler can be reduced as compared with the conventional method, the furnace body can be reduced in size and the equipment can be made more compact. I can do it.

Further, since the tangential heating means and the heating means for heating the steel strip from both end faces are combined, not only can the temperature of the steel strip be recovered in a short time, but also the uniformity of the furnace temperature can be improved. Can be further enhanced.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a Steckel mill rolling equipment and a rolled state of a strip according to a first embodiment of the present invention.

FIG. 2 is an enlarged view of the furnace coiler shown in FIG.

FIG. 3 is a sectional view taken in the direction of arrows III-III in FIG. 2;

FIG. 4 is a view schematically showing a heating state of a coil in a furnace of an incoming furnace coiler.

FIG. 5 is a sectional view taken in the direction of arrows VV in FIG. 4;

FIG. 6 is a diagram illustrating a second embodiment of the present invention, and is a diagram schematically illustrating a heating state of a coil in a furnace of a furnace coiler.

FIG. 7 is a sectional view taken in the direction of arrows VII-VII in FIG. 6;

8 is a diagram schematically showing a heating direction of the coil shown in FIGS. 6 and 7 and an effect of inputting heat to the coil.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hot rolling mill 2 Furnace coiler (entrance side) 3 Furnace coiler (exit side) 4 Entry roller table 5 Exit roller table 6 Entry thickness gauge 7 Egress thickness gauge 8 Entry pinch roller 9 Exit pinch Roller 10 Strip steel 11 Mandrel 12 Deflector guide 13 Inside guide 14 Deflector roller 15 Upper furnace body 16 Lower furnace body 17 Mount 18 Side burner 19 Coil 20 Chimney 21 Bearing 22 Joint 23 Sealing member 24 Tangential burner

Continued on the front page (72) Inventor Yunosuke Uda 1-5-8 Kyobashi, Chuo-ku, Tokyo Japan Metallurgical Industry Co., Ltd. (72) Inventor Tetsuya Kubota 1-5-8 Kyobashi, Chuo-ku, Tokyo Japan Inside Metallurgical Industry Co., Ltd. (72) Inventor Yoshio Okamoto 4-2 Kojima-cho, Kawasaki-ku, Kawasaki City, Kanagawa Prefecture Nippon Yakin Kogyo Co., Ltd. Kawasaki Works (56) References JP-A-10-137844 (JP, A) Hei 9-271843 (JP, A) JP-A Hei 3-193217 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B21C 47/00 B21B 1/34 B21B 45/00 B21C 47 / 26

Claims (3)

(57) [Claims] 1. A furnace mill comprising a hot rolling mill for performing reversible rolling, a mandrel provided on an inlet side and an outlet side of the hot rolling mill and winding a steel strip in a coil shape, and the steel strip. And a roller table for rolling the strip, heating the inside of the furnace coiler to a high temperature, and winding both ends of the strip wound in a coil shape in the sheet width direction. Heating means to prevent the temperature of the steel strip from lowering by heating from
Steckel mill rolling equipment provided on the furnace side wall of the furnace coiler. 2. The steckel mill rolling equipment according to claim 1, wherein the heating means is provided radially on a furnace side wall of the furnace coiler and emits a flame from both end faces in the sheet width direction of the strip to heat. Steckel mill rolling equipment, characterized by a plurality of side burners. 3. The steckel mill rolling equipment according to claim 1, further comprising at least one tangential heating means for emitting a flame in a circumferential direction of the coil of the steel strip and stirring the furnace gas, in addition to the heating means. Steckel mill rolling equipment, characterized in that: