JP6337828B2 - Caliber roll backup device - Google Patents

Description

  The present invention relates to a caliber roll back-up device in the case of rolling a rolled material with a perforated rolling mill using a caliber roll formed with a perforated form, for example, to a perforated rolling mill that rolls shape steel or bar steel in the steel industry. Is preferred.

  For example, in a universal rolling mill for rolling H-section steel, as described in Patent Document 1 and Patent Document 2 below, for example, a backup roll is arranged on the opposite side to the rolled material of each roll to suppress roll deflection. By doing this, there is one that increases the rolling load.

JP 2000-190002 A JP-A-57-109507

By the way, a shaped steel such as a steel sheet pile is rolled by a hole-type rolling mill using a caliber roll in which a hole shape is formed. A perforating mill that backs up the caliber roll formed with this perforation over the entire length in the axial direction with a backup roll is not common. For this reason, a perforated rolling mill using a caliber roll has a problem that the upper limit value of the rolling load is small because bending during rolling of the caliber roll cannot be suppressed.
The present invention has been made paying attention to the above-mentioned problems, and a caliber roll backup device capable of increasing the upper limit value of the rolling load even in an existing hole rolling mill without a backup roll. Is intended to provide.

In order to solve the above-described problems, according to one aspect of the present invention, when a rolled material is rolled by a hole-type rolling mill using a caliber roll having a hole shape, the rolled material rolled by the caliber roll is obtained. A deformation suppressing roll that is arranged on the opposite side across the caliber roll and that is in contact with the outer peripheral surface of the caliber roll only at the center in the axial direction of the caliber roll and is rotatably supported, and at least deformed during rolling of the rolled material by the caliber roll A caliber roll backup device is provided that includes a pressing device that presses the restraining roll against the caliber roll.
The central part in the axial direction of the caliber roll means not only the central position in the axial direction of the caliber roll, but also the area where the outer peripheral surface of the caliber roll exists including this central position.

  In the caliber roll backup apparatus of the present invention, the upper limit value of the rolling load can be increased even with an existing hole rolling mill without a backup roll.

It is a partial cross section front view showing one embodiment of a perforated rolling mill to which a caliber roll backup device of the present invention is applied.

The following embodiments exemplify apparatuses and methods for embodying the technical idea of the present invention, and the technical idea of the present invention is the material, shape, structure, arrangement, etc. of components. Is not specified as follows. The technical idea of the present invention can be variously modified within the technical scope defined by the claims described in the claims.
Hereinafter, an embodiment of a caliber roll backup device of the present invention will be described with reference to the drawings. FIG. 1 is a partial cross-sectional front view of a perforated rolling mill to which the caliber roll backup device of this embodiment is applied. In this perforated rolling mill, for example, a caliber roll 1 for rolling a steel sheet pile rolled material S is provided on a horizontal axis lined up and down. In the caliber roll 1, a hole shape corresponding to the product shape of the rolled material S is formed. In this perforated rolling mill, a frame is constituted by the left and right housing parts 2 and the upper and lower separator parts 3 connecting the housing parts 2. A roll chock 4 that supports the caliber roll 1 is supported on the housing portion 2, and a reduction device 5 that moves the roll chock 4 is attached. When the roll chock 4 is moved by the motor 6 of the reduction device 5, a reduction force (a reduction load) is applied to the caliber roll 1.

  In this embodiment, a small-diameter short deformation suppressing roll 7 is disposed between each of the upper and lower caliber rolls 1 and each of the upper and lower separator portions 3. The deformation suppressing roll 7 is in contact with the outer peripheral surface of the caliber roll 1 only at the central portion in the axial direction of the caliber roll 1 on the opposite side of the caliber roll 1 of the rolled material S rolled by the caliber roll 1. 1 deformation is suppressed. In the deformation suppressing roll 7, the rotating shafts 8 at both ends in the roll axial direction are rotatably supported by bearings 9, and a bearing housing 10 that holds the bearings 9 is attached to the rod 12 of the cylinder 11. The cylinder 11 is provided in the upper and lower separator sections 3, and the upper cylinder 11 is arranged such that the rod 12 faces downward, and the lower cylinder 11 faces the rod 12 upward. When these cylinders 11 generate a specified pressing force and press the deformation suppressing roll 7 against the caliber roll 1, a rolling force by the deformation suppressing roll 7 can be applied in addition to the rolling force by the rolling device 5. That is, the cylinder 11 constitutes a pressing device 13 that presses the deformation suppressing roll 7 against the outer peripheral surface of the caliber roll 1. It is desirable to use an air cylinder for the cylinder 11 so that the rod 12 moves backward when the caliber roll 1 is excessively deformed. As described above, the central portion in the axial direction of the caliber roll 1 means not only the central position in the axial direction of the caliber roll 1 but also the region where the outer peripheral surface of the caliber roll 1 exists including this central position. To do.

  In an existing perforated rolling mill that does not have a backup roll that contacts the outer peripheral surface of the roll over the entire length in the roll axis direction, it is difficult to suppress deformation of the caliber roll 1 during rolling, and the rolling load exceeds the upper limit value. The caliber roll 1 may break at the stepped portion. If a backup roll formed with a hole shape that fits into the hole shape of the caliber roll is disposed on the opposite side of the caliber roll of the rolled material, the size of the hole rolling mill becomes unrealistic. Moreover, in the existing perforated rolling mill like this embodiment, the clearance gap between the caliber roll 1 and the separator part 3 is small, and a large sized backup roll cannot be arrange | positioned.

  The deformation (deflection) at the time of rolling of the caliber roll 1 is the largest at the central portion in the axial direction of the caliber roll 1, and if this portion is pressed from the side opposite to the rolled material S, the deformation at the time of rolling of the caliber roll 1 is suppressed. Can do. And even if the rolling force of the rolling device 5 that rolls down the caliber roll 1 via the roll chock 4 is regulated by a specified value, the pressing force of the cylinder 11 that is the pressing device 13 is added to the rolling force of the caliber roll 1. Therefore, even if it is an existing hole-type rolling mill, the upper limit value of a substantial rolling load can be raised. For example, when the upper limit value of the reduction load of the caliber roll 1 by the reduction device 5 is 500 t on each of the left and right sides, that is, 1000 t, that is, the upper limit value of the reduction load of the existing perforated rolling mill as it is is 1000 t. If a rolling load is applied by 250 t at each of the left and right cylinders 11 serving as the pressing device 13, the total rolling load as the hole-type rolling mill is 1500 t.

  As described above, in the caliber roll backup device of this embodiment, when a rolled material is rolled by a perforated rolling mill using the caliber roll 1 formed with a perforation, the caliber roll is only in the central portion in the axial direction of the caliber roll 1. A deformation suppressing roll 7 that is in contact with the outer peripheral surface of the roll 1 and is rotatably supported is disposed on the opposite side of the rolled material S with the caliber roll 1 interposed therebetween, and at least the pressing device 13 is rolled when the rolled material S is rolled by the caliber roll 1. Thus, the deformation suppressing roll 7 is pressed against the caliber roll 1. Thereby, while being able to suppress efficiently the deformation | transformation of the caliber roll 1 at the time of rolling, the pressing force of the deformation | transformation suppression roll 1 by the press apparatus 13 can be added to the reduction force of the caliber roll 1, and a reduction load is enlarged. It becomes possible to do.

Moreover, the pressing device 13 is configured by the cylinder 11 provided in the separator portion 3 of the frame constituting the perforating rolling mill, and the size of the deformation suppressing roll 7 can be arranged between the separator portion 3 and the caliber roll 7. It was a big size. Thereby, even if it is an existing hole rolling mill, a caliber roll backup device can be provided, and the reduction load of the existing hole rolling mill can be increased.
It goes without saying that the present invention includes various embodiments not described herein. Therefore, the technical scope of the present invention is defined only by the invention-specific matters described in the appropriate claims from the above description.

DESCRIPTION OF SYMBOLS 1 Caliber roll 2 Housing 3 Separator part 4 Roll chock 5 Reduction device 6 Motor 7 Deformation suppression roll 8 Rotating shaft 9 Bearing 10 Bearing housing 11 Cylinder 12 Rod 13 Pressing device S Rolling material

Claims (1)

A caliber roll backup device in the case of rolling a rolled material with a hole mill using upper and lower caliber rolls formed with a hole mold,
The rolled material that is rolled by the upper and lower caliber rolls is disposed on the opposite side of the upper and lower caliber rolls, and is in contact with the outer peripheral surface of the upper and lower caliber rolls only at the center in the axial direction of the upper and lower caliber rolls. And upper and lower deformation suppression rolls that are rotatably supported,
A pressing device that presses the upper and lower deformation suppressing rolls against the upper and lower caliber rolls when rolling the rolled material with at least the upper and lower caliber rolls,
Both the upper and lower deformation suppressing rolls are designed not to fit into the hole mold formed in the upper and lower caliber rolls ,
The pressing device is
Consists of cylinders provided in the upper and lower separator parts of the frame constituting the perforated rolling mill,
Each of the upper and lower deformation suppressing rolls is
It is a size that can be arranged between the upper and lower separator parts and the upper and lower caliber rolls,
The caliber roll backup device , wherein the cylinder is an air cylinder .

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