JPH1052718A - Device for straightening bending at outlet of rolling mill in wide flange shape - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a straightening device which is specially effective on the reduction of the upper/lower bending at the outlet of the tip and rear ends of a wide flange shape and with which the change of a guide for preventing the coiling-around of the rolled stock of every roll is unnecessitated. SOLUTION: In a device for straightening the bending at the outlet of the tip and rear end parts of a material 3 to be rolled which is provided closely to the outlet side of a finishing universal mill, plural guides 4 for preventing coiling-around of the rolled stock which are supported movably up and down and right and left and with which respective both sides of the web of the material 3 to be rolled are independently restrained from the upper and lower sides, and freely rotatable end face rollers 5 which are provided to the respective guides 4 for preventing coiling-around of the material to be rolled so as to be vertically movable and with which each end face of the flanges of the material 3 to be rolled are pressed are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a straightening device in a section steel rolling mill, and more particularly to a straightening device for reducing vertical bending in finish rolling of an H-shaped rope.

[0002]

2. Description of the Related Art Generally, an H-section steel is manufactured by a universal rolling mill for rolling section steels. In the finish rolling, as shown in FIGS. Or it is deformed downward. Such a deformation is called bending,
It is generally unavoidable, mainly due to improper rolling balance due to the thickness difference between the upper and lower flanges at the front and rear ends of the H-section steel. This vertical bend is a typical defect of the shape of the H-section steel, and a portion with a short distance cannot be corrected, and the yield is deteriorated due to cutting down. Improvement is required.

[0003] As a technique for improving the bending of the material to be rolled,
For example, Japanese Patent Laid-Open Publication No. Sho 51-110474 and Japanese Utility Model Application
The bending straightening device for an H-section steel described in Japanese Patent No. 31845 discloses a technique in which a flange of the H-section steel is constrained by rollers from inside and outside, and plastic bending is given to the material to be rolled to correct the bending. In addition, the guiding device for rolling a section described in JP-A-4-1570011, JP-A-4-210811 and JP-A-5-7911 is such that a web or a flange tip is constrained by a roller at a rolling mill entry side. Then, the bending is corrected and bitten into a rolling mill to reduce the deviation of the center of the web. In addition, 7-37405
The guide device for rolling H-beams described in the above publication corrects the torsion of the H-beam that has been finish-rolled by the twist prevention device installed on the exit side of the rolling mill.

[0004]

However, the above-mentioned Japanese Patent Application Laid-Open No. Sho 51-110474 and Japanese Utility Model Publication No. 7-3184.
The straightening device for H-section steels described in Japanese Patent Publication No. 5 is effective for bending the entire length of the material to be rolled, but is not sufficiently effective for straightening the front and rear ends. Also, Japanese Patent Application Laid-Open No. 4-1
The guiding apparatus for rolling a section described in JP-A-57011, JP-A-4-210811 and JP-A-5-7911 is a guiding apparatus for rolling, and does not provide an effect of correcting a bending. Furthermore, in the guide device for rolling H-beams described in Japanese Utility Model Laid-Open Publication No. 7-37405, since the set value of the guide roller is constant over the entire length of the rolled material, the toe of the flange is crushed, so there is room for improvement. is there.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and does not require replacement of a rolled material winding prevention guide for each roll. It is an object of the present invention to provide a correction device particularly effective for reduction.

[0006]

Means for Solving the Problems An apparatus for correcting the bending of a H-shaped steel rolling mill installed near the outlet side of a finishing universal rolling mill according to the present invention and for correcting the vertical bending of the front and rear ends of a material to be rolled. Are supported movably up and down and left and right, and a plurality of rolled material winding prevention guides for independently restraining each side of the web of the material to be rolled from above and below, and each of the rolling material winding prevention guides can be moved up and down. And a rotatable end roller for pressing the end face of each flange of the material to be rolled. Therefore, each of the rolled material winding prevention guides can move independently in the vertical and horizontal directions,
Compatible with all sizes of rolled material.

Further, the rolled material winding prevention guide has a rolling direction moving mechanism, so that it is not necessary to replace the rolled material winding prevention guide for each roll. In addition, the rotatable end roller for pressing the end face of each flange of the material to be rolled has an end roller vertical mechanism, and the front and rear end portions can be projected without affecting the entire length of the material to be rolled by contact of the end roller. It is possible to correct only the bent part.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. FIG. 1 is a front view showing a main part configuration of an apparatus for straightening and bending an H-section steel according to Embodiment 1 of the present invention, and FIG.
Is a side view. In the drawing, reference numeral 1 denotes a rolling mill housing, which constitutes a finishing universal rolling mill main body. Reference numeral 2 denotes a pair of upper and lower horizontal rolls for rolling down an H-section steel web to be finish-rolled. Reference numeral 3 denotes a material to be rolled, which is finish-rolled by the horizontal roll 2 and a vertical roll (not shown). Reference numeral 4 denotes a rolled material winding prevention guide constituting a vertical bending correction device, which is formed in a wedge shape installed on the roll-out side so as to be in contact with the outer periphery along the outer periphery of the horizontal roll 2 and has a rolled material 3. Of the web 31 can be independently restrained from above and below. Reference numeral 5 denotes an end roller, which is a non-driven flat roller which is vertically movably disposed in a state protruding horizontally from the side surface of the rolled material winding prevention guide 4 and restrains the end surface of the flange 32.

As described above, on the exit side of the finishing universal rolling mill, the upper and lower sides of the H-shaped steel member configured to restrain the left and right sides of the web 31 of the material to be rolled 3 from above and below and to lower the end face of the flange 32. The rolled material winding prevention guide 4 of the bending correction device is supported by a vertical movement mechanism 7 that moves up and down by a cylinder provided in a unit 6 that traverses the rear surface of the rolling mill housing 1. The lateral position of the unit 6 is
It is set at a predetermined position by the traversing mechanism 8 driven by the provided cylinder. In addition, the end face roller 5
Is supported by an end roller vertical mechanism 9 driven by a cylinder provided on the rolled material winding prevention guide 4 so as to move up and down along the side surface. Further, the rolled material winding prevention guide 4 comes into contact with and separates from the horizontal roll 2 by a rolling direction moving mechanism 10 driven by a cylinder.

[0010] The H to be finish-rolled according to the first embodiment described above.
In order to correct the vertical bending of the section steel, first, the rolled material winding prevention guide 4 is set to the thickness of the web 31 of the rolled material 3 so that both sides of the web 31 of the rolled material 3 after finish rolling are restrained from above and below. Fig. 1
It is set at a symmetrical position with a pass line indicated by a horizontal broken line inside. The end rollers 5 are set at intervals equal to the width of the flange 32 of the material 3 to be rolled after the finish rolling.
As shown in FIG. 3, if the bending of the material 3 to be rolled is upward bending, the degree of upward bending is detected, a predetermined amount of reduction is added downward, plastic deformation is performed, and straightening is performed. The end roller 5 is lowered so as to perform correction, and immediately thereafter, the end roller 5 is raised. If the material 3 to be rolled is bent downward, the end roller 5 is raised to perform plastic deformation for straightening, and then the end roller 5 is immediately lowered. FIG. 4 shows a cross section of the product after straightening of the upper and lower ends of the rolled material. FIG. 4 (a) shows the end face roller 5 provided on the rolled material winding prevention guide 4 after straightening of the material to be rolled.
(B) is obtained by correcting the bending of the material to be rolled and rolling the end surface roller 5 of the rolled material winding prevention guide 4 at the set position. After straightening, the pinching of the end roller 5 is released, so that the end roller 5 can be prevented from being crushed at the center of the product.

Embodiment 2 FIG. 5 is a front view of an apparatus for straightening an H-beam rolling mill according to Embodiment 2 of the present invention, and FIG.
Is a side view, in which a vertical movement mechanism 71 provided in the unit 6 that traverses the rear surface of the rolling mill housing 1 is operated by a motor and a screw. The lateral position of the unit 6 is set to a predetermined position by a traversing mechanism 81 operated by a motor and a screw screw.
Is made to move up and down along the side surface by an end roller vertical mechanism 91 operated by a motor and a screw provided on the rolled material winding prevention guide 4. The rolling material winding prevention guide 4 is driven by a motor and a screw. The position in the rolling direction is adjusted by the rolling direction moving mechanism 101 that operates.

FIG. 7 is a side view showing the retracted state of the rolled material winding prevention guide 4 constituting the curving device for avoiding interference with the rolling roll 2 when the rolling roll 2 is replaced. The rolling direction moving mechanism 10 (101) retracts the rolled material winding prevention guide 4 in a direction away from the rolling rolls 2 to avoid interference with the rolling rolls at the time of roll replacement.

[0013]

EXAMPLES Table 1 shows the statistical data of the amount of bending which shows the effect of the present invention. H-section steel size is H200xB20
The test data when using the straightening device and when not using the straightening device are summarized for the samples of 0, H500xB200, and H900xB300. A product with significantly reduced dimensional accuracy can be obtained.

[0014]

[Table 1]

[0015]

As described above, according to the present invention, the leading and trailing ends of the material to be rolled are provided by the bending correction device having the end face roller provided on the rolled material winding prevention guide provided near the exit side of the finishing universal rolling mill. By subjecting the material to be rolled to finish rolling while restraining the flange end face of the portion, the amount of bending can be favorably reduced. Further, each rolled material winding prevention guide of the bending correction device can be individually moved up, down, left and right, and can correspond to the free size of the material to be rolled. In addition, there is a traversing mechanism for feeding the rolled material winding prevention guide to a position close to the rolling rolls, making it unnecessary to replace the rolled material winding prevention guide for each roll. Further, the rolled material winding prevention guide has an end face roller moving mechanism for raising and lowering the end face roller immediately after correcting the bent portion of the material to be rolled. The bent portion at the front and rear ends can be satisfactorily corrected without adversely affecting the portion.

[Brief description of the drawings]

FIG. 1 is a front view showing a configuration of a main part of an apparatus for correcting a vertical bending of an H-section steel according to Embodiment 1 of the present invention.

FIG. 2 is a side view showing a configuration of a main part of the vertical bending correction device for the H-section steel according to the first embodiment of the present invention.

FIG. 3 is an operation explanatory view showing a straightened state of a material to be rolled.

FIG. 4 is a cross-sectional view showing an end shape and a flange end face shape of an end portion and a central portion of a material to be rolled to which the apparatus for correcting a vertical bending of an H-section steel according to Embodiment 1 of the present invention is applied.

FIG. 5 is a front view showing a configuration of a main part of an apparatus for correcting a vertical bending of an H-section steel according to Embodiment 2 of the present invention.

FIG. 6 is a side view showing a configuration of a main part of a vertical bending correction device for H-section steel according to Embodiment 2 of the present invention.

FIG. 7 is an explanatory view showing a retracted state at the time of exchanging rolling rolls of the apparatus for correcting a vertical bending of an H-section steel according to the present invention.

FIG. 8 is an explanatory diagram showing a state in which a bend occurs in the finish-rolled H-section steel.

FIG. 9 is a partially enlarged view showing the vertically bent shape of the end of the H-section steel that has been finish-rolled.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Roller housing 2 Horizontal roll 3 Rolled material 4 Rolled material winding prevention guide 5 End roller 6 Unit 7 Vertical movement mechanism 8 Traverse movement mechanism 9 End roller vertical mechanism 10 Rolling direction movement mechanism

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Tatsuro Udagawa 1-2-1 Marunouchi, Chiyoda-ku, Tokyo Inside Nihon Kokan Co., Ltd.

Claims (3)

[Claims] An apparatus for correcting bending of a front and rear end of a material to be rolled, which is installed close to the outlet side of a finishing universal rolling mill, is supported so as to be movable up and down and left and right. A plurality of rolled material wrap prevention guides independently constrained from above and below, and a rotatable end roller provided on each of the rolled material wrap prevention guides so as to be vertically movable and pressing each flange end surface of the rolled material. A bending straightening device for an H-beam rolling mill, comprising: 2. The straightening apparatus according to claim 1, wherein the rolled material winding prevention guide has a rolling direction moving mechanism. 3. The straightening device for an H-section steel rolling machine according to claim 1, wherein the rotatable end roller for pressing each flange end surface of the material to be rolled has an end roller vertical mechanism.