JP2963261B2 - Rolling mill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling mill,
A rolling mill having two upper and lower work rolls for performing rolling, and a reinforcing roll provided for each work roll to support a rolling load, and for manufacturing a plate product or a band product having a predetermined thickness. About.

[0002]

2. Description of the Related Art Conventionally, various kinds of rolling have been carried out to produce a plate-shaped product or a band-shaped product having a predetermined thickness by passing a plate-shaped material or a band-shaped material between a pair of work rolls provided opposite to each other. Machine is used. Technical issues of the rolling control of the sheet material include control of the sheet thickness distribution (sheet crown) and flatness (sheet shape) in the sheet width direction. Means for solving these technical problems include technologies such as roll bending force, roll shift, and roll cross.

All of these means are effective for controlling the crown and shape of the strip, and are techniques that have already been adopted in many strip rolling mills. However, since the distribution of the rolling load acting between the rolled material and the work roll in the width direction of the roll is generally unknown, it has been difficult to accurately estimate the crown and shape of the strip after rolling.

For example, JP-A-57-68208 discloses a hydraulic chamber in which a rolling load is received by a support beam via a hydraulic pressure, and the support beam is divided into a plurality of sections in the axial direction of a work roll. Is disclosed in which the load distribution in the axial direction of the work roll, that is, in the width direction of the work roll, can be arbitrarily changed. According to this rolling mill, it is possible to estimate the load distribution by detecting the oil pressure, and to control the deflection of the work roll to control the sheet crown, but there is a problem that an advanced sealing technique is required. .

[0005] Japanese Patent Application No. 3-23045 filed by the same applicant.
According to the specification No. 0, at least one of the reinforcing rolls provided for each work roll to support the rolling load is divided into a plurality in the axial direction and disposed, and a load detecting means is provided for each divided reinforcing roll, 2. Description of the Related Art There has been proposed a rolling mill capable of controlling the deflection of a work roll by detecting a load distribution in the axial direction of the work roll. According to this rolling mill, the load distribution between the rolled material and the work roll is estimated based on the information of the load detection value for each divided reinforcing roll, and thereby the sheet crown and sheet shape after rolling are estimated with high accuracy. obtain.

[0006] In the rolling mill using the divided reinforcing rolls,
Since the reinforcing roll is divided, depending on the operating conditions, it is conceivable that a roll mark may be formed on the outer peripheral surface of the work roll due to the peripheral edges at both ends in the axial direction of the divided reinforcing roll, or local wear may occur.

[0007]

SUMMARY OF THE INVENTION In view of the above problems, a main object of the present invention is to estimate a load distribution between a rolled material and a work roll and to produce a rolled material having excellent surface quality. A rolling mill is provided.

[0008]

SUMMARY OF THE INVENTION According to the present invention, there is provided, in accordance with the present invention, a pair of rolling work rolls provided opposite to each other, and an outer periphery of at least one of the work rolls for supporting a rolling load. The rolls are disposed so as to be relatively rollable on a surface, and the reinforcing rolls are divided into a plurality of portions in the axial direction of the work rolls, and the divided reinforcing rolls each have a load detecting device independently of each other, The present invention is attained by providing a rolling mill characterized in that a work roll and the split reinforcing roll can be selectively moved relatively in an axial direction.

[0009]

In this manner, the reinforcing roll is divided into a plurality of portions, and if a rolling-down device and a load detecting device are provided for each of the divided reinforcing rolls, the load distribution between the rolled material and the work roll can be estimated. In addition, since it is possible to highly accurately estimate the shape of the sheet crown and sheet after rolling, it is possible to perform rolling with a suitable rolling load distribution by each reduction device, and to relatively selectively work the work roll and the divided reinforcing roll. By moving the roller in the axial direction, the rolling portion of the divided reinforcing roll changes as appropriate, so that it is possible to prevent a roll mark or local wear on the work roll.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a preferred embodiment of the present invention. FIG. 1 is a schematic side view of a rolling mill to which the present invention is applied. In a housing 1 of the rolling mill, a pair of work rolls 2 arranged so as to face each other up and down for rolling is provided. 3 and reinforcing rolls 4a to 9c provided for each work roll 2.3 for supporting the work rolls 2.3 and receiving a rolling load.
Then, a rolled material 10 supplied from the left side in FIG. 1 is sandwiched between the two work rolls 2 and 3 so as to be rolled.

Since the combination of the work rolls 2 and 3 and the reinforcing rolls 4a to 9c of the present rolling mill are provided symmetrically with the upper and lower roll assemblies, the upper roll assembly will be described in detail below. The upper reinforcing rolls 4a to 6c are located immediately above the work roll 2 and are shown in FIG. 2 as viewed along the line II-II in FIG. Central divided reinforcing rolls 4a to 4d divided into four at equal pitch intervals in the axial direction of 2
And the front and rear divided reinforcing rolls 5a to 5c and 6a which are symmetrically disposed diagonally before and after the work roll 2 and are divided into three so as to be located between the central divided reinforcing rolls 4a to 4d.
To 6c. Thus, the reinforcing roll is divided into seven parts along the axial direction of the work roll 2 as a whole. The number of divisions is not limited to seven, but is preferably an odd number in order to facilitate symmetric control and save the number of actuators.

The work roll 2 is supported by the divided reinforcing rolls 4a to 6c directly above and obliquely front and rear, and the divided reinforcing rolls 4a to 6c can roll with respect to the work roll 2. The work roll 2 is rotatably supported at both ends by a chock 11. In addition,
Each chock 11 is integrally provided with a thrust receiving roller 12 for receiving the axial force of the work roll 2, and keeper plates 13 provided at both ends of the housing 1 in the axial direction of the work roll 2. Are brought into contact with the roller 12. The tip of an actuator rod 14 of a driving device for moving the work roll 2 in the axial direction via a chock is connected to the keeper plate 13.

Each of the divided reinforcing rolls 4a to 6c is pivotally attached to a clevis member 16 fixed to a tip of a ram of a hydraulic cylinder 15, respectively. A load detecting device 17 using, for example, a load cell is provided at an intermediate portion of the ram.
Between the cylinder and the base end of the ram, there is provided a displacement detector 18 capable of detecting the displacement of the ram as the displacement of the split reinforcing roll.

In the rolling mill constructed as described above, the load distribution acting between the work roll 2 and the divided reinforcing rolls 4a to 6c can be measured by the load detecting device for each divided reinforcing roll. As shown in the specification of Japanese Patent Application No. 3-230450 filed by the same applicant, the distribution of the rolling load acting between the rolled material 10 and the work roll 2 can be estimated from the measured values. Furthermore, the rolled material 10 after rolling
The thickness distribution in the width direction can also be estimated. Based on these estimated values, control of the rolling position of each of the divided reinforcing rolls 4a to 6c is performed in order to produce a desired thickness distribution and a rolled product having a plate shape. It can be performed quickly with high accuracy and hydraulic pressure. Therefore, it is possible to detect and control the crown and the shape of the plate during rolling with high accuracy without time delay, and the control accuracy of the crown and the shape of the rolled plate is dramatically improved. Can achieve the automation of the rolling operation work.

According to the present rolling mill, the work roll 2 can be selectively moved in the axial direction as shown by the solid line and the imaginary line in FIG. In the case of hot rolling, the work roll 2 is moved at idle time and each of the divided reinforcing rolls 4a to 6c is moved.
By periodically changing the contact position between the roller and the work roll 2, it is possible to preferably avoid the roll mark and the roll local wear. Also, in the case of cold rolling, particularly in the case of complete continuous rolling, the work roll 2 is continuously moved even during rolling, so that the contact positions between the divided reinforcing rolls 4a to 6c and the work roll 2 are continuously adjusted. By changing to
Roll marks and roll local wear can be suitably avoided.

In this embodiment, the divided reinforcing rolls 7a to 9c are also configured in the same manner as described above in the lower roll assembly, so that a suitable rolling load distribution of the work roll 3 can be achieved and the divided reinforcing rolls 7a to 9c can be achieved. 9c and work roll 3
The contact position with the can be changed appropriately. Further, not only the work roll but also the split reinforcing roll side may be moved.

[0017]

As described above, according to the present invention, by employing a load detecting device for each of the divided reinforcing rolls, it is possible to improve the accuracy of controlling the crown and shape of the rolled plate.
Rolls generated on the outer peripheral surface of the work roll by the split reinforcing rolls can achieve high-precision automation of the rolling operation work and can relatively selectively move the work roll and the split reinforcing roll in the axial direction. Mark and roll local wear can be suitably avoided, and a rolled material with excellent surface quality can be manufactured.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a rolling mill to which the present invention is applied.

FIG. 2 is a schematic diagram of a main part viewed along line II-II in FIG. 1;

FIG. 3 is a schematic plan view of an upper roll assembly of a rolling mill to which the present invention is applied.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 2.3 Work roll 4a-4d Central division | segmentation reinforcement roll 5a-5c Front division | segmentation reinforcement roll 6a-6c Rear division | segmentation reinforcement roll 7a-7d Center division | segmentation reinforcement roll 8a-8c Front division | segmentation reinforcement roll 9a-9c Rear division | segmentation reinforcement Roll 10 Rolled material 11 Chock 12 Thrust receiving roller 13 Keeper plate 14 Actuator rod 15 Hydraulic cylinder 16 Clevis member 17 Load detector 18 Displacement detector

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI B21B 31/18 B21B 31/18 B 37/00 BBH 37/00 BBH 37/38 117B 37/42 144 37/58 117C 116F 116T ( 58) Field surveyed (Int.Cl. ⁶ , DB name) B21B 13/14 B21B 29/00 B21B 31/18 B21B 37/00 BBH

Claims (1)

(57) [Claims] 1. A pair of rolling work rolls provided opposite to each other, and a pair of rolling rolls are disposed so as to be relatively rollable on an outer peripheral surface of at least one of the work rolls to support a rolling load, and It has a reinforcing roll divided into a plurality of portions in the axial direction of the work roll, and has a load detecting device independently for each of the divided reinforcing rolls, and relatively selects the work roll and the divided reinforcing roll in the axial direction. A rolling mill characterized in that the rolling mill can be moved.