JP2915406B1 - Rolling equipment and rolling method for section steel - Google Patents

Abstract

Abstract: PROBLEM TO BE SOLVED: To provide a shaped steel rolling facility and a rolling method which can combine two facilities conventionally required into one. SOLUTION: A plurality of large finishing mills 21 and 22 and a plurality of small finishing mills 34 which can be changed to a transfer table are provided downstream of a heating furnace 1 and a rough rolling mill 2.
・ 35 etc. were arranged in series in this order.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling equipment and a rolling method suitable for producing H-shaped steels and other shaped steels.

[0002]

2. Description of the Related Art Sectional steel mill rolling equipment provided in steel mills and the like is roughly classified into two types as shown in FIGS. 4 (a) and 4 (b). The rolling equipment B shown in FIG. 1A is used for producing relatively small section steel, and is provided downstream of the heating furnace 1 and the subsequent rough rolling mill (BD mill) 10 with a small finishing mill. .. Are arranged in series (eight in the example in the figure). The material heated in the heating furnace 1 (rolled material, bloom formed by continuous casting, etc.) is passed through the rough rolling mill 10 in a plurality of reciprocating passes (that is, reverse-rolled), and thereby has a substantially H-shaped cross section. After being formed into a shape, the roll is passed through a plurality of rolling mills 31 ′ and the like on the downstream side by only one pass, whereby finish rolling is performed.

On the other hand, a rolling facility C shown in FIG. 4 (b) is used for producing a relatively large section steel, and is provided with a large-sized apparatus downstream of the heating furnace 1, the roughing mill 10 and the transfer 3. Are arranged in plurals. The material heated in the heating furnace 1 and passed through the rough rolling mill 10 a plurality of times is transferred to the downstream rolling mill 21 ′ and the like in a plurality of ways after the line is changed in the transfer 3. Finish rolling. In addition,
The transfer 3 is performed on both lines so that the material passed through the rough rolling line 2 including the rough rolling mill 10 and the material passed through the finishing rolling line 4 including the finishing rolling mill 21 ′ etc. do not hit each other. It is a portion that is laterally spaced between 2.4 and includes a mechanism for moving material between them.

[0004] Rolling equipment as shown in FIG. 4 (b) is disclosed in, for example, JP-A-6-335701 and JP-A-6-335702.
No., published in Japanese Patent Application Publication No.

[0005]

The reasons for selectively using rolling equipment as described above according to the size of the section steel to be produced are as follows. That is, a) a small section steel has a large temperature drop based on a small cross-sectional area and a small heat capacity. Therefore, after being heated in a heating furnace, it is necessary to complete rolling in a short time as possible. In addition, since the weight per unit length is small, it is desired that a sufficient length be rolled in a short time in order to secure a production amount. For this reason, it is preferable that the finish rolling is performed by allowing a number of rolling mills arranged in series to pass the material through only one pass. Further, in the case of a small-sized section steel, the finish rolling can be performed by a small rolling mill. Therefore, even if the number of rolling mills is large, there is little disadvantage in cost.

(B) On the other hand, a large-sized rolling mill is required to produce a large-sized section steel. Therefore, it is desirable that the number of rolling mills be small in terms of equipment cost. In addition, large shaped steel
In addition to the large heat capacity, the temperature drop is gradual, and the weight per unit length is large, so that even if rolling takes time, the balance between the preceding and following equipment (casting equipment, refining equipment, etc.) can be maintained. It is easy to secure production volume. Considering such points, it is preferable that a large-sized section steel be rolled through a large number of passes by a small number of rolling mills.

However, if the rolling equipment is properly used depending on the size of the shaped steel as in the prior art, two types (two lines) of rolling equipment are installed in parallel to produce a wide range of shaped steel. There is a need. If two rolling facilities were to be installed, a considerable installation area and equipment costs would naturally be required.

[0008] The claimed invention provides a section steel rolling facility and a rolling method (a method of using the rolling facility), which can combine two previously required facilities as described above. It is.

[0009]

According to a first aspect of the present invention, there is provided a section steel rolling facility comprising a plurality of large finishing mills (for finishing rolling large section steel) downstream of a heating furnace and a rough rolling mill. A suitable rolling mill) and a plurality of small finishing mills (rolling mills suitable for finishing rolling small shaped steel) capable of being changed to a transfer table are arranged in series in this order. I do.

[0010] In this rolling equipment, small and large section steels can be produced as follows. First, for a small shaped steel, for example, having a height (outside between flanges) and a width (width of flange) of about 200 mm or less, the material heated in the heating furnace is roughly rolled in a rough rolling mill, Finish rolling is performed by a plurality of large finishing rolling mills and a plurality of small finishing rolling mills arranged in series as described above. Large finish rolling mills will also roll small sections, but this can be done without difficulty by incorporating appropriate rolling rolls for small sections in the mill. Since the material is passed through both large and small finishing rolling mills arranged in series, if each rolling mill is installed in an appropriate number, as in the case of FIG. The material can be finish rolled with just a pass. In this case, since the rolling is performed in a short time in one pass, the temperature drop of the material is small, and the production amount is secured, and the condition described in (a) is satisfied.

On the other hand, for a large section steel, for example, having a height or width of about 200 mm or more, after the material heated in the heating furnace is roughly rolled in a rough rolling mill,
Finish rolling can be performed using the plurality of large finishing rolling mills described above. Since it is difficult to roll a large section steel into a small finishing mill among the above, rolling is performed by passing the material through a large finishing mill only a plurality of times. In this case, a small finishing rolling mill is not used as a rolling mill, but is used for transporting a material (section steel) by changing to a transport table. Then, in effect, FIG.
The material is rolled as in the equipment of (b), and the condition of (b) is also satisfied.

Since small and large section steels can be produced together in this way, according to this rolling equipment, a wide range of sizes can be obtained without installing two types (two lines) of rolling equipment in parallel. Can be produced.

In the rolling equipment according to the present invention, a universal mill and an edger mill are arranged in combination as the plurality of large finishing mills and the plurality of small finishing mills, and each of the small finishing mills It is characterized in that the entire stand (including the rolling rolls and the like) can be replaced with a transfer table capable of rotating the feed rolls at a higher speed than the rolling rolls in the rolling mill.

In this rolling equipment, a universal mill and an edger mill are arranged in combination in the large finishing rolling mill and the small finishing rolling mill described above, so that the efficiency is higher than in the case where a two-high mill using a caliber roll is arranged. Rolling can be performed. Therefore, even if the number of both large and small rolling mills is small, a small section steel can be rolled in one pass, and even if the number of large finishing mills is small (about 3), it is small. The number of passes (about three times) makes it possible to roll a large section steel.

[0015] This equipment also includes a small finishing mill.
As described above, since the transfer table is configured to be replaceable with the transfer table capable of rotating the feed roll at a high speed, the rolling efficiency can be increased even when a large-sized section steel is produced. The reason is as follows. That is, a) When the rolling by completing a plurality of passes to the large finishing rolling mill is completed and the large section steel exits the rolling mill at the end, the feed speed of the section steel corresponding to the decrease in the cross-sectional area is It is generally quite high. b) When rolling a small section steel by passing the material through both large and small finishing mills for one pass, the rolling is not yet completed at the position of the last part of the large finishing mill. The reduction in steel cross section is small and the feed rate is not as high as in a) above. c) Among the small finishing rolling mills used for rolling small shaped steel, those located at the front position near the large finishing rolling mill, adjust the rolling roll to the speed of the above a) for the reason of b) above. It is normally difficult to drive in rotation. d) Therefore, when rolling a large section steel, if the rolling force between rolling rolls is set to zero in a small finishing mill and the rolls are used for conveying the material, the speed limit of the rolls is limited. Therefore, the feed speed of the large finishing mill in the above a) must be limited. e) If the output of the driving motor is increased for the rolling rolls in the small finishing mill, the rolling rolls can be adjusted to the speed of the above a), and it is also possible to solve the speed limit as in the above d). In order to increase the output of a motor for a roll having a high load, equipment costs are considerably increased. f) In that regard, if the small finishing mill can be replaced with a transfer table as described above, and its feed roll is rotated at high speed in accordance with the above a),
The speed limitation of d) is not required, and the cost required for the motor for driving the feed roll is small. Therefore, in this rolling equipment, while suppressing the increase in equipment costs,
Large shaped steel can be rolled with high efficiency.

According to a third aspect of the present invention, there is provided a method for rolling a section steel, wherein when a small section steel is produced by using the above-mentioned rolling equipment, the material processed in a heating furnace and a rough rolling mill is used. 1 for all large and small finishing mills
In the case of producing a large section steel by finishing rolling by passing, the material processed in the heating furnace and the rough rolling mill is subjected to finish rolling by making a plurality of reciprocating passes only to the large finishing rolling mill described above. And transport on a transport table obtained by changing a small finishing mill.

As described above, if the above-mentioned rolling equipment is used in this way, small and large steel bars can be produced smoothly. In addition, regarding the finish rolling of small shaped steel, in one pass, the rolling is performed in a short time, so that it is easy to suppress the temperature drop of the material and to secure the production amount. Regarding finish rolling of a large section steel, the material is passed through only a large finish rolling mill a plurality of times. In particular, when the rolling equipment according to claim 2 is used, a section steel can be efficiently produced as described above.

According to a fourth aspect of the present invention, there is provided a rolling method for producing a large-sized section steel using the section steel rolling equipment according to the first or second aspect. The material processed by the rolling mill is rolled by expanding the flange portion (that is, as shown in FIGS. 3B and 3C).
Finish rolling is performed by making multiple passes in a reciprocating manner to a universal mill and an edger mill for rolling (rolling) and a universal mill for rolling the flange portion at right angles to the web (that is, so-called H rolling as shown in FIG. 3D). In the transfer table obtained by changing the small finishing mill, the feed speed (rotational speed of the feed roll in the rolling equipment according to claim 2) is controlled for each pass.

In this rolling method, as described above, a universal mill and an edger mill for so-called X rolling and a universal mill for so-called H rolling are arranged as a large finishing mill for rolling a large section steel. Since the material is rolled by making them pass back and forth a plurality of times, the material can be efficiently finish-rolled with a small number of passes. The X-rolling and the H-rolling can efficiently perform the rolling because the rolling force is easily applied to the flange portion and the web portion, and the width dimension of the flange can be accurately finished without going through another process. And that the material is rolled by as many as three rolling mills in one pass.

Further, in this rolling method, when the large-sized section steel is finish-rolled, the above-mentioned transfer table obtained by changing the small finishing mill controls the feeding speed for each pass. The feed rate of the material in the large finishing mill is different for each pass, and the speed of the final stage where the cross-sectional area decreases is usually higher. Therefore, if the feed speed of the transfer table is controlled for each pass as described above, the speed of the material by the large finishing mill can be matched with the feed speed of the transfer table, and the material can be made extremely smooth and efficient. It can be transported in an efficient manner.

[0021]

1 to 3 show an embodiment of the present invention. FIG. 1 is a plan view schematically showing the entire hot rolling facility A. FIG. 2 is a plan view showing a state in which the finish rolling line 4 of the facility A is rolling a small section steel X. 3 is a plan view or the like showing a state where the same finish rolling line 4 is rolling a large section steel Y.

The rolling equipment A shown in FIG. 1 is configured as follows. That is, 1) the heating furnace 1 is arranged in the upstream part, and the rough rolling line 2, the transfer 3, and the finish rolling line 4 are continued downstream thereof. The rough rolling line 2 is provided with one 2-high type rough rolling mill 10 having a pair of horizontal caliber rolls (not shown) at the top and bottom. In the finishing rolling line 4 on the downstream side, finishing rolling mill groups 20 and 30 are arranged in this order. As shown, three large finishing mills 21 to 23 are provided in series in the former rolling mill group 20, and five small finishing mills 34 to 38 are provided in the latter rolling mill group 30 downstream thereof. They are provided in series. The transfer 3 is a means for moving the material (the steel X or the steel Y after the rolling is completed) between the rough rolling line 2 and the finishing rolling line 4 as described above.

2) As the large finishing mills 21 to 23 in the rolling mill group 20, as shown in FIGS. 2 and 3, a universal mill 21, a 2 high mill 22, and a universal mill 23 are provided in this order. Although it is a large rolling mill, it is also possible to roll a small section steel (such as an H-section steel having a height and width of about 200 mm or less) by appropriately selecting a rolling roll to be used. When a large H-section steel is rolled, as shown in FIGS. 3B to 3D, so-called X-rolling is performed on each of the universal mill 21 and the 2 high mill 22 by expanding the flange portion. Roll 21a
・ Universal mill 2 incorporating 21b and 22a
3 has a flange portion at right angles to the web, so-called H
Rolls 23a and 23b for rolling can be incorporated.

3) As the small finishing mills 34 to 38 in the rolling mill group 30, as shown in FIG. 2, four universal mills 34, 35, 36 and 38 and one high mill 37 are used.
And are arranged. Since both are small rolling mills,
For inspection / maintenance or replacement of rolling rolls, it is common to remove the entire stand. In connection therewith, the rolling mill group 30 can be changed to a transfer table 40 as shown in FIG. That is, each of the rolling mills 34 to 38 can be removed together with the stand and replaced with a transporter 44 to 48 with a feed roll.

In the rolling equipment A of FIG. 1 configured as described above, small and large H-section steels XY are produced as follows. First, when producing small H-section steel X,
1) The material (such as a continuous cast piece) heated in the heating furnace 1 of FIG. 1 is passed through a rough rolling mill 10 in a rough rolling line 2 to be roughly rolled to a substantially H-shaped cross-sectional shape. At this time, the material is made to pass through the rough rolling mill 10 three or five times by reversing the material.

2) The material after the rough rolling is transferred to the finish rolling line 4 by the transfer 3 and then passed through the rolling mill groups 20 and 30 to finish rolling. At this time, appropriate rolling rolls are incorporated into the large rolling mills 21 to 23 so that the small H-section steel X can be rolled smoothly, and the finish rolling is performed in the rolling mills 21 to 2.
3 and all subsequent rolling mills 34-38 by only one pass of material. Since a large number of rolling mills 21 to 38 are arranged in series, the material can be finished to a small H-section in only one pass without being reversed. The speed of the material on the entry side to the rolling mill 21 at the head of the rolling mill group 20 is about 1 m / s, the speed on the entry side of the rolling mill 34 at the head of the rolling mill group 30 is about 3 m / s,
The speed at the exit of the last rolling mill 38 is about 10 m.
/ S. Since rolling can be performed in a short time with only one pass, there are advantages that the production efficiency is high and the temperature drop of the material is small. If the temperature drop of the material is small, it is possible to reduce the energy required for the heating furnace 1 and the power required for rolling, and also to reduce the deformation and residual stress of the material.

On the other hand, when a large H-section steel Y is produced, 1) the material heated in the heating furnace 1 shown in FIG. Is rough-rolled by multiple passes.

2) The material after the rough rolling is transferred to the finish rolling line 4 by the transfer 3, and
Finish rolling is performed by passing through a rolling mill group 20 as shown in FIG. As described above, among the rolling mills (universal mill 21, 2 high mill 22 and universal mill 23) in rolling mill group 20, the material is X-rolled in the first two and the latter (mill 23) in the second one. H roll. Since the small rolling mills 34 to 38 (FIGS. 1 and 2) do not have the ability to roll large H-beams, as described above, they are removed together with the stand and transporters 44 to 48 (transport table 40). ). In the large rolling mill group 20, the material is made to pass back and forth three times, and the speed (feed speed) of the feed roll of each of the transporters 44 to 48 on the transport table 40 is set.
Shall be changed according to the material speed for each pass. That is, in the first pass, since the speed of the material at the exit side of the rolling mills 21 to 23 is about 3 m / s, the speed of each roll of the transport table 40 is also made to match it, and in the last pass, the rolling mill group 20 Since the speed at the exit side is about 6 m / s, the speed of the transfer table 40 is determined accordingly. This speed of about 6 m / s is, as described above (FIG. 2), the speed at the leading rolling mill 34 or the like when the small section steel X is finish-rolled using the rolling mill group 30 (as described above). It is considerably higher than about 3 m / s), and it is difficult to adjust the speed of the rolling rolls of the rolling mill 34 and the like to this, but the speed of the feed rolls in the transport table 40 that does not perform rolling is particularly high. In addition, no special cost burden is imposed on the driving motor and the like.

The rolls 21a and 2a used for X rolling
When the surface is worn or damaged, 1b can be used for rolling a shaped steel having the same size as the original one by reworking the surface and changing its position.

Although one embodiment of the present invention has been described above, it goes without saying that the present invention is not limited to this embodiment. For example, in each of the rolling mill groups 20 and 30,
The radix of each small finishing mill may be changed according to production conditions and the like, and is not limited to the above (see FIG. 1 and the like).
The position and radix of the 2 high mills in the rolling mill group 30 are not limited to the above. Although a two-high mill has been used as the rough rolling mill 10 in the above description, a combination of a horizontal mill and a universal mill or a combination of a vertical mill and a horizontal mill may be used instead.

[0031]

The rolling equipment for section steel according to the first aspect has the following effects. A) A wide range of shapes of section steel can be produced by a set of rolling equipment having only one line. for that reason,
The problem of the installation space for the rolling equipment is easily solved, and the equipment cost is small.

B) In the case of obtaining a small section steel, it is possible to finish-roll in a short time by allowing both large and small finishing mills to pass the material in only one pass. The rolling can be performed in a preferable mode according to the size, for example, by reducing the number of expensive large-scale finishing rolling mills and making multiple passes through them, thereby reducing equipment costs.

The rolling equipment according to claim 2 further includes: c) the universal mill and the edger mill are combined in the large finishing rolling mill and the small finishing rolling mill. Is small,
Small and large section steel can be rolled efficiently.

D) Since a small finishing mill can be replaced with a transfer table capable of rotating feed rolls at high speed, large-sized section steel can be rolled with high efficiency while suppressing equipment costs. Can be.

According to the method for rolling a section steel according to the third aspect, e) small and large sections can be produced smoothly. In addition, for finish rolling small steel bars,
Since rolling is performed in a short time in one pass, it is possible to suppress the temperature drop of the material and to easily secure the production amount, and it is possible to suppress the equipment cost for large-sized section steel.

According to the rolling method of the fourth aspect, f) when producing a large-sized section steel, the so-called X-rolling and H-rolling are repeatedly performed to finish-roll the material, so that the number of passes is small. Can be finish-rolled efficiently. Since the rolling roll used for the X rolling can be used for a long time by reworking the surface or the like, there is an additional advantage that the equipment cost can be reduced.

G) When the large section steel is finish-rolled, the feed speed of the transfer table, which is obtained by changing the small finishing mill, is controlled for each pass, so that the material can be smoothly transferred.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of the present invention,
It is a top view which shows the whole rolling equipment A typically.

FIG. 2 is a plan view showing a state in which a finish rolling line 4 in the rolling equipment A of FIG. 1 is rolling a small section steel X.

FIG. 3 (a) is a plan view showing a state in which a finish rolling line 4 of the rolling equipment A of FIG. 1 is rolling a large section steel Y. Also, each of FIGS.
It is a schematic diagram which shows the cross section of the material (section steel Y) in the rolling mill 21,22,23 in the same (a), and the shape of a rolling roll.

FIG. 4 is a schematic plan view showing conventional section steel rolling facilities A and B. FIG. 4 (a) relates to a rolling facility B for producing a relatively small section steel, and FIG. 4 (b) relates to a rolling facility C for producing a relatively large section steel. .

[Explanation of symbols]

 Reference Signs List A Rolling equipment 1 Heating furnace 10 Rough rolling mill 20 Large finishing rolling mill group 21 ・ 22 ・ 23 Large finishing rolling mill 30 Small finishing rolling mill group 34 ・ 35 ・ 36 ・ 37 ・ 38 Small finishing rolling mill 40 Carrying table X Small Shaped steel Y Large shaped steel

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B21B 1/08 B21B 39/12

Claims (4)

(57) [Claims] Claims 1. A plurality of large finishing mills and a plurality of small finishing mills that can be changed to a transfer table are arranged in series in this order downstream of a heating furnace and a rough rolling mill. Rolling equipment for shaped steel. 2. A plurality of large finishing rolling mills and a plurality of small finishing rolling mills, wherein a universal mill and an edger mill are arranged in combination, and each of the small finishing rolling mills has a stand as a whole. The rolling equipment for section steel according to claim 1, characterized in that it can be replaced with a transfer table capable of rotating and driving a feed roll at a higher speed than the rolling roll in (1). 3. In the case of producing a small-sized shaped steel by using the shaped steel rolling equipment according to claim 1 or 2, the material processed in the heating furnace and the rough rolling mill is subjected to the above-mentioned large finishing. In the case of producing a large section steel by finishing rolling by making one pass to all of the rolling mill and the small finishing rolling mill, the material processed in the heating furnace and the rough rolling mill is subjected to the large finishing rolling described above. A method of rolling a shaped steel, comprising: performing finishing rolling by making a plurality of passes only in a reciprocating machine, and transporting the finished steel on a transport table obtained by changing a small finishing mill. 4. When a large-sized section steel is produced by using the section steel rolling equipment according to claim 1 or 2, the large-scale finish rolling mill uses a material processed in a heating furnace and a rough rolling mill. The above-mentioned conveyance is performed by changing a small finishing mill by performing a plurality of reciprocating passes through a universal mill and an edger mill, which rolls by expanding the flange portion, and a universal mill, which rolls the flange portion at right angles to the web. A method for rolling section steel, wherein the feed speed of the table is controlled for each pass.