JP3801350B2 - Rolling equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rolling facility for hot rolling a strip such as a steel plate.
[0002]
[Prior art]
Conventionally, as shown in FIGS. 7 to 8, rolling equipment for hot rolling a strip such as a steel plate has been used. This rolling equipment includes a plurality of sets (for example, 7 sets) of rolling mill rows arranged in series at equal intervals on a hot rolling line. Each of the rolling mills F _{1 to} F ₇ is a four-roll type rolling mill. FIG. 7 shows four rolling mills in the latter half of the rolling mill row. As shown in FIG. 7, each of the rolling mills F _{4 to} F ₇ has a configuration including a pair of upper and lower work rolls 22 a and 22 b and a pair of upper and lower backup rolls 23 a and 23 b in the housing 21. The upper and lower work rolls 22a and 22b and the upper and lower backup rolls 23a and 23b are respectively provided in the housing 21 so as to be vertically movable via a bearing box (not shown). The axial center position of the upper work roll 22a is offset from the axial center position of the upper backup roll 23a to a position offset by a minute distance δ ₁ from the downstream side of the rolling line. On the other hand, the axial center position of the lower work roll 22b is offset from the axial center position of the lower backup roll 23b to a position offset by a minute distance δ ₁ from the downstream side of the rolling line. Thus, when the upper and lower work rolls are offset upstream or downstream with respect to the respective backup rolls, the positions of these work rolls in the horizontal path direction are stabilized. As shown in FIG. 7 described above, when the offset is performed on the downstream side, the upper and lower work rolls 22a and 22b are stabilized on the exit side, and the rolling is stabilized.
[0003]
The roll interval between the upper and lower work rolls 22a and 22b is set to a desired value by a gap adjusting mechanism (not shown). The upper and lower work rolls 22a and 22b are given a reduction force through the upper and lower backup rolls 23a and 23b by a reduction cylinder or the like disposed on the housing 21. The upper and lower work rolls 22a and 22b are rotationally driven by a driving device (not shown) such that a strip is passed between the left and right sides and rolled between them.
[0004]
Between the stands S of each of the rolling mills F _{1 to} F ₇ , there is a function of pushing up the strip by contacting the strip to be rolled from below, and a tension control mechanism 24 for the strip between the stands called a looper is installed. Has been.
[0005]
The strip 25 is hot-rolled by passing the strip 25 having a high temperature through the rolling equipment from the rolling mill F ₁ to F _{7 in} order.
It is known that when the high temperature strip 25 is passed through the conventional rolling equipment at a high speed and rolled, the strip 25 is rolled through a generation process as shown in FIG.
[0006]
FIG. 8 is a characteristic diagram showing the change with time of accumulated strain generated when the high-temperature strip 25 is rolled by the rolling equipment, with the horizontal axis representing time and the vertical axis representing strain accumulated by rolling. Show. As shown in FIG. 8, when the high temperature strip 25 passes through the rolling mill F _2, for example, a large rolling distortion is generated by the rolling force of the upper and lower work rolls 22a and 22b, and then from the rolling mill F _2. The rolling distortion generated under the action of the rolling mill F ₂ is recovered until the next rolling mill F ₃ is reached, and the rolling mill reaches the rolling mill F ₃ again to generate a large rolling distortion. Rolling strain generated under the action of the rolling mill F ₃ is recovered from F ₃ to the next rolling mill F ₄ , and the same rolling strain generation process and distortion recovery process are repeated. By accumulating the strain generated in the strip 25 in such a process, the composition of the strip 25 is gradually densified, and a thin rolled material is obtained. Recovery amount of rolling strain is proportional to the magnitude of the stand spacing S of the rolling mill F ₁ to F _7.
[0007]
However, the above-described conventional rolling equipment has a problem that since the stand interval S is large, the recovery amount of rolling distortion is large, and it is difficult to efficiently improve the strength of the rolled material.
[0008]
[Problems to be solved by the invention]
The present invention provides a rolling facility capable of efficiently increasing the accumulation of rolling strain and reducing the strength of the rolled material efficiently by shortening the stand interval of the rolling mill and reducing the recovery amount of rolling strain. It is what.
[0009]
[Means for Solving the Problems]
A rolling facility according to the present invention includes a rolling mill row arranged on a hot rolling line, and each rolling mill is a rolling facility having a pair of work rolls and a backup roll, and is the most downstream in the rolling mill row. at least a pair of rolling mill adjacent side is incorporated into the housing for each rolling mill and downstream of the work rolls and the front stage of the work roll that is offset with respect to each of the backup roll on the side close to each other In addition, the offset distance is offset larger than the offset distance of the other upstream work roll .
[0010]
Further, another rolling equipment according to the present invention includes a rolling mill array arranged on a hot rolling line, each rolling mill is a rolling equipment having a pair of work rolls and a backup roll, and the rolling mill train downstream of at least a pair of rolling mill adjacent to each other, incorporated into the housing for each pair of the rolling mill, and downstream of the work rolls and the front stage of the work rolls that are each backup on the side close to each other of It is offset with respect to the roll, and the offset distance is offset larger than the offset distance of the other upstream work roll .
[0011]
【Example】
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
Example 1
1 is a side view showing a rolling mill row of the rolling equipment of Example 1, FIG. 2 is a side view showing rolling machines F ₆ and F ₇ of FIG. 1, and FIG. 3 is a case where rolling is performed by the rolling equipment of Example 1. FIG. 4 is a plan view for explaining the meandering state of the strip. FIG.
[0012]
This rolling equipment includes seven sets of rolling mills F _{1 to} F ₇ arranged on a hot rolling line. The high-temperature strip is first passed through the rolling mill F ₁ and then the rolling mill F ₂ , rolling mill F ₃ , rolling mill F ₄ , rolling mill F ₅ , rolling mill F ₆ , rolling mill F ₇ . Passed in order. Each of the rolling mills F _{1 to} F ₇ is a four-roll type, and is incorporated in an independent housing 1. As shown in FIG. 1, each of the rolling mills F _{1 to} F ₇ includes a pair of backup rolls 2 a and 2 b that are vertically arranged at a desired distance from each other in the housing 1, and the pair of backup rolls 2 a and 2 b. A pair of work rolls 3a and 3b disposed between each is provided. The pair of backup rolls 2a and 2b and the pair of work rolls 3a and 3b are respectively provided in the housing 1 so as to be vertically movable via a bearing box (not shown).
[0013]
Work rolls 3a of the respective rolling mill F ₁ to F _5, a central axial position of the 3b, each of the backup rolls 2a, is offset from the axis position of 2b in a position distance [delta] ₁ eccentric to the downstream side of the rolling line Yes. As shown in FIG. 2, the work rolls 3a of the rolling mill F _6, a central axial position of the 3b, each of the backup rolls 2a, at positions distance [delta] ₂ eccentric to the downstream side of the rolling line from the axis position of 2b It is offset. On the other hand, the work rolls 3a of the rolling mill F _7, 3b axis position of each of the backup rolls 2a, is offset from the axis position of 2b on the upstream side to the distance [delta] ₂ eccentric position of the rolling line. Thus rolling mill F ₆ and the rolling mill F ₇ work rolls 3a, each of the backup roll 2a on the side closer to 3b to each other by an offset from 2b, between stands of the rolling mill F ₆ and the rolling mill F ₇ S ₁ can be made shorter than the inter-stand S of the rolling mills F _{6 to} F ₇ of the conventional rolling equipment shown in FIG. In Example 1, the offset distance δ ₂ of the rolling mills F _{6 to} F ₇ was made larger than the offset distance δ ₁ of F _{1 to} F ₅ , and the inter-stand S ₁ was set to the minimum interval.
[0014]
Vertical work rolls 3a, roll spacing 3b of the rolling mill F ₁ to F ₇ is set to a desired value by not shown gap adjusting mechanism. In each of the rolling mills F _{1 to} F ₇ , the upper and lower work rolls 3 a and 3 b are applied with a reduction force through the upper and lower backup rolls 2 a and 2 b by a reduction cylinder disposed on the housing 1. The upper and lower work rolls 3a and 3b are rotationally driven by a driving device (not shown) so that a strip is passed between the left and right sides and rolled between them.
[0015]
A tension control mechanism 4 is installed between the stands S of the rolling mills F _{1 to} F ₆ . Since the interval S ₁ between the stands of the rolling mill F ₆ and the rolling mill F ₇ is set to the minimum interval as described above, the tension control mechanism 4 is unnecessary.
[0016]
According to the rolling equipment as described above in detail, the work rolls 3a of a pair of rolling mill F ₆ adjacent rolling mill F _7, 3b are each backup roll 2a, approaching from 2b work rolls 3a, 3b each other mutually Therefore, the stand interval S ₁ between the rolling mill F ₇ and the rolling mill F ₆ is compared with the conventional rolling equipment (for example, as shown in FIG. 7) in which the offset direction of the work roll is aligned in the same direction. It can be shortened. When the high temperature strip 5 is passed through the rolling equipment from the rolling mill F ₁ to F _{7 in} order, rolling strain is accumulated on the strip 5 as shown in FIG. Since the time for the strip 5 to pass between the rolling mills F ₆ and F ₇ is shortened, before the rolling distortion of the strip 5 generated by the rolling action by the rolling mill F ₆ is sufficiently recovered, the next rolling is performed. Rolling by the machine F ₇ can be performed, and the accumulation of rolling distortion by the rolling machine F ₆ can be increased. As a result, a high-strength rolled material can be efficiently generated.
[0017]
Also, when rolling by rolling a high temperature strip through the rolling equipment at high speed, due to the asymmetry in the width direction such as the gap difference in the roll axis direction of the strip plate off-center or the upper and lower work rolls As shown in FIG. 4 (a), the free end of the strip 5 that passes through the upper and lower work rolls 3a and 3b of the rolling stand meanders to the left, or as shown in FIG. 4 (b). The rear end of the strip 5 that has become free from the upper and lower work rolls 3a and 3b of the rolling stand may meander to the right. The bent front end or rear end of the strip 5 is passed between the upper and lower work rolls 3a and 3b of the next rolling stand in a state of being folded inward by hitting the side guide. Such a phenomenon is called throttling, and tends to increase the rate of occurrence on the downstream side where the thickness of the strip 5 becomes thin. When this squeezing phenomenon occurs, the upper and lower work rolls 3a and 3b are damaged, so that the work rolls need to be rearranged, and the productivity is lowered.
[0018]
When the stand interval S ₁ between the two sets of the downstream rolling mills F ₆ and F ₇ where the meandering is most likely to occur in the rolling mill row as in the rolling equipment of the first embodiment described above is shortened, the rolling mill F ₆ it is possible to begin the reduction to reach the next rolling mill F ₇ before the bend meander the end of the strip 5 away occurs, it is possible to meander bends is prevented. As a result, troubles of drawing rolling due to meandering bending can be avoided, and damage to the work roll due to the drawing phenomenon and roll replacement can be prevented.
[0019]
In the above-described first embodiment, an example in which the present invention is applied to two sets of rolling mills on the downstream side of the rolling mill row has been described. Can be applied. Further, the number of rolling mills to be applied is not limited to a pair, and may be two or more. By applying to two or more pairs of rolling mills, it is possible to increase the accumulation of rolling distortion more efficiently and further improve the strength of the rolled material. In particular, from the viewpoint of satisfying both the improvement of the strength of the rolled material and the reduction of the drawing rate, the two downstream rolling mills in the rolling mill row are incorporated into independent housings for each rolling mill, And it is preferable to offset each pair of work rolls from the respective backup rolls to the side where the pair of work rolls approach each other. Furthermore, by applying the above-described configuration to the other two or more sets in combination with the two downstream sets of rolling mills, the strength of the rolled material can be further improved, and the squeezing rate can be greatly reduced. Can do.
[0020]
(Example 2)
FIG. 5 is a side view showing a rolling mill row of the rolling equipment of Example 2, and FIG. 6 is a side view showing rolling mills F ₆ and F ₇ of FIG.
[0021]
As shown in FIG. 5, this rolling facility includes seven sets of rolling mills F _{1 to} F ₇ arranged on a hot rolling line. The high-temperature strip is first passed through the rolling mill F ₁ and then the rolling mill F ₂ , rolling mill F ₃ , rolling mill F ₄ , rolling mill F ₅ , rolling mill F ₆ , rolling mill F ₇ . Passed in order. Each of the rolling mills F _{1 to} F ₇ is a four-roll type similar to that described in the first embodiment. Each of the rolling mills F _{1 to} F ₃ is incorporated in an independent housing 1. Wherein each rolling mill F ₁ to F ₃ work rolls 3a, a central axial position of the 3b, each of the backup rolls 2a, is offset from the axis position of 2b in a position distance [delta] ₁ eccentric to the downstream side of the rolling line Yes. A tension control mechanism 4 is installed between the stands S of the rolling mills F _{1 to} F ₃ .
[0022]
As shown in FIGS. 5 and 6, the rolling mill F ₆ and the rolling mill F ₇ is incorporated in one housing. Work rolls 3a, a central axial position of 3b of the rolling mill F _6, each of the backup rolls 2a, is offset from the axis position of 2b in a position distance [delta] ₂ eccentric to the downstream side of the rolling line. On the other hand, the work rolls 3a of the rolling mill F _7, 3b axis position of each of the backup rolls 2a, is offset from the axis position of 2b on the upstream side to the distance [delta] ₂ eccentric position of the rolling line. In this way, the rolling mill F ₆ and the rolling mill F ₇ are incorporated in one housing 1, and the work rolls 3 a, 3 b of these rolling mills F ₆ , F ₇ are moved from the respective backup rolls 2 a, 2 b to the side approaching each other. by offsetting it can be shortened as compared with the interstand S ₁ of the rolling mill F ₆ and mill between stands F ₇ rolling mill of the rolling equipment S ₁ example 1 F _6, F _7. In Example 2, the offset distance δ ₂ of the rolling mills F _{6 to} F ₇ was made larger than the offset distance δ ₁ of F _{1 to} F ₃ , and the inter-stand S ₁ was set to a small interval. The rolling mill F ₅ and the rolling mill F _4, incorporated into the similarly single housing and rolling mill F ₆ to F ₇ described above, the work roll 3a in the same manner as the rolling mill F ₆ to F ₇ described above, the 3b The backup rolls 2a and 2b were offset from each other on the side approaching each other. Further, the offset distance δ ₂ and the inter-stand S ₁ of the rolling mills F ₄ and F ₅ were set similarly to the rolling mills F _{6 to} F ₇ described above. Further, interstand S ₂ of the rolling mill F ₆ and mill F ₅ is shorter than the interstand S of the rolling mill F ₁ to F _3.
[0023]
According to the rolling equipment described in detail above, a pair of adjacent rolling mills F ₄ and F ₅ , and a pair of adjacent rolling mills F ₆ and F ₇ are housed in the housing, respectively. Since the work rolls 3a and 3b are offset from the backup rolls 2a and 2b to the side where the work rolls 3a and 3b come close to each other, the stand interval S between the rolling mill F ₄ and the rolling mill F ₅ is used. ₁ and the stand interval S ₁ between the rolling mill F ₆ and the rolling mill F ₇ are provided with a conventional rolling equipment (for example, as shown in FIG. 7) having a housing for each rolling mill and having the work roll offset direction aligned in the same direction. ) Can be significantly shortened. If high-temperature strips 5 are passed through the rolling equipment from the rolling mill F ₁ to F _{7 in} order, the rolling strain can be accumulated in the strip 5 more efficiently. It can be produced with high rolling efficiency.
[0024]
Further, when the stand interval S ₁ between the two sets of the downstream rolling mills F ₆ and F ₇ in which the meandering is most likely to occur in the rolling mill row as in the rolling equipment of Example 2 described above, the rolling mill F reaches the next rolling mill F ₇ before the bend meander the end of the strip 5 away resulting from ₆ can start rolling, the serpentine bends can be prevented from occurring. As a result, troubles of drawing rolling due to meandering bending can be avoided, and damage to the work roll due to the drawing phenomenon and roll replacement can be prevented.
[0025]
In the above-described second embodiment, an example in which the present invention is applied to four sets of rolling mills on the downstream side of the rolling mill row has been described. However, the present invention is not limited to the downstream side, and any of the upstream side, the intermediate side, and the downstream side Can be applied. Moreover, a pair may be sufficient as the number of the rolling mills to apply. In particular, from the viewpoint of satisfying both the improvement in the strength of the rolled material and the reduction in the drawing rate, the two sets of rolling mills on the downstream side of the rolling mill row are incorporated in one housing and each pair of workpieces. It is preferable that the roll is offset from each backup roll to the side where the pair of work rolls approach each other. Furthermore, by applying the above-described configuration to the other two or more sets in combination with the two downstream sets of rolling mills, the strength of the rolled material can be further improved, and the squeezing rate can be greatly reduced. Can do.
The rolling equipment according to the present invention can be applied to either a row of rough rolling mills or a row of finishing mills in a rolling line.
[0026]
【The invention's effect】
As described above in detail, according to the present invention, it is possible to provide a rolling facility capable of producing a high-strength rolled material with high rolling efficiency.
[Brief description of the drawings]
FIG. 1 is a side view showing a rolling mill row of a rolling facility according to a first embodiment.
FIG. 2 is a side view showing the rolling mills F ₆ and F ₇ of FIG.
FIG. 3 is a characteristic diagram showing a relationship between accumulation of strain due to rolling and time when rolling is performed with the rolling equipment of Example 1.
FIG. 4 is a plan view for explaining a meandering state of a strip.
5 is a side view showing a rolling mill row of the rolling equipment according to Embodiment 2. FIG.
6 is a side view showing the rolling mills F ₆ and F ₇ of FIG. 5. FIG.
FIG. 7 is a side view showing a part of a rolling mill row of a conventional rolling facility.
FIG. 8 is a characteristic diagram showing the relationship between the accumulated strain due to rolling and the time when rolling is performed with a conventional rolling facility.
[Explanation of symbols]
1 ... Housing,
2a, 2b ... backup roll,
3a, 3b ... work rolls,
4 ... Tension control mechanism.

Claims (2)

The rolling mill is arranged on a hot rolling line, and each rolling mill is a rolling facility having a pair of work rolls and a backup roll, and at least a pair of the rolling mill rows adjacent to each other on the most downstream side . mill is incorporated into the housing for each rolling mill, and with the most downstream of the work rolls and the front stage of the work roll that is offset with respect to each of the backup roll on the side close to each other, the offset distance Is offset larger than the offset distance of other upstream work rolls . The rolling mill is arranged on a hot rolling line, and each rolling mill is a rolling facility having a pair of work rolls and a backup roll, and at least a pair of the rolling mill rows adjacent to each other on the most downstream side . mill is incorporated into the housing for each pair of the rolling mill, and with the most downstream of the work rolls and the front stage of the work roll that is offset with respect to each of the backup roll on the side close to each other, the The rolling equipment characterized in that the offset distance is offset larger than the offset distance of other upstream work rolls .

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