JPH084832B2 - Straightening device for end bending of steel bars with a wire rod mill - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an end straightening device for a steel bar material by a bar wire mill.

[0002]

2. Description of the Related Art Generally, in the case of rolling by a bar wire mill, the front end and the rear end of a steel bar are bent. That is, the end portion of the steel bar material is warped by its own weight due to the influence of gravity and bends left and right.

Regarding the end bending of a steel bar material by such a wire rod mill, when the wire rod mill is used as a wire rod mill, the total length of the rolled wire rod coil is long, and the yield is obtained even if the tip bent portion is cut off. Degradation is less of a problem, but when using a wire rod mill as a steel bar mill,
Since standard length or double length rolling is usual, if the bent end portion of the steel bar is discarded, the product yield will be greatly reduced.

Therefore, conventionally, the bent end portion of the steel bar is corrected off-line by a leveler device, but the bent end portion is slightly corrected by the leveler device but is not sufficiently corrected. The reality is that the bent end is cut off.

Further, conventionally, a delivery guide device for guiding a steel bar has been arranged on the delivery side of the final finishing stand of the bar mill, but the bent end portion of the delivery guide device is used. However, there was a problem in that the amount of cut-off bending at the end (particularly the tip) was relatively large.

Further, a double roller guide of horizontal and vertical roller arrangement is known as a guide and guide device for a steel bar that can be arranged on the outlet side of the final finishing stand of a bar and wire mill (Actual Fairness 3).
-47683).

[0007]

[Problems to be Solved by the Invention] However, actual fairness 3-4
In the prior art disclosed in Japanese Patent No. 7683, a pair of horizontal rollers are elastically supported by springs in order to reliably guide and guide the rolled steel material to the next stand between rolling stands and prevent surface scratches on the product. Therefore, it is impossible to effectively correct the end bending of the rolled steel material.

The present invention has been made by paying attention to such a conventional problem, and aims to correct the end bending of the steel bar, improve the yield and reduce the work of correcting the end bending off-line. An object of the present invention is to provide an end straightening device for a steel bar material by a bar wire mill.

[0009]

The feature of the end straightening device for bar steel by a bar wire mill according to the present invention is that the bar steel bar is arranged close to the rolling roll on the exit side of the final finishing stand of the bar wire mill. And a double roller guide device of an HV array disposed in the vicinity of the exit guide guide device, wherein the double roller guide device is provided from the exit guide guide device. The pair of horizontal rollers for passing the bar steel and the pair of vertical rollers for passing the bar steel from the horizontal roller are provided. The horizontal roller and the vertical roller are rigidly supported by the guide box.

In the rigid support structure, the horizontal roller and the vertical roller are rotatably supported by the support shaft portion, and one end of the support shaft portion is rotatably fitted in the support hole of the guide box. The eccentric shaft portion is fitted eccentrically with respect to the shaft center of the eccentric shaft portion, and an eccentric shaft portion rotatably supported by the guide box is provided on the other end side of the support shaft portion. The eccentric shaft portion is formed such that the shaft center is eccentrically supported with respect to the shaft center of the support shaft portion, and the eccentric shaft portion is provided with a worm wheel. , Worm gears provided on the worm shaft and having mutually reverse screws mesh with each other.

[0011]

[Operation] When the steel bar rolled out from the rolling roll is bent downward due to gravity or further bent to the left or right, first, the end of the bar-rolled steel bar is passed through a pair of horizontal rollers to make a pass line. And the warp of the steel bar is straightened by the vertical roller, and the ends of the steel bar bent left and right are straightened by the vertical rollers to correct the left and right bends. The same applies when the rolling mill comes out due to warpage.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, an apparatus for straightening an end portion of a steel bar by a bar wire mill is a rolling roll (not shown) on the delivery side of a final finishing stand of a bar wire mill (for example, a 3-roll bar wire mill). ), And a horizontal guide roller 2 arranged in a horizontal-vertical (HV) arrangement, which is arranged in the vicinity of the exit guide guide device 1 for guiding the steel bar. Composed.

As shown in FIGS. 1 and 2, the double roller guide device 2 has a pair of horizontal rollers 3 and 3 which pass the steel bar material from the delivery guide device 1 and are positioned vertically.
a and a pair of vertical rollers 4 and 4a which are positioned in a lateral relationship and through which the steel bars from the horizontal rollers 3 and 3a are passed. In addition, the delivery side guide device 1 is installed on the rolling roll so that the distance between the roll center axis of the rolling roll on the delivery side of the final finishing stand of the bar wire mill and the roll center axis of the horizontal rollers 3 and 3a is about 350 mm. The double roller guide device 2 is arranged in close proximity to the exit guide guide device 1. The double roller guide device 2 includes a guide box 5, an inlet side guide portion 6 for guiding the steel bar material from the outlet side guide device 1 between the pair of horizontal rollers 3, 3a, and a pair of vertical rollers 4, 4.
The outlet side guide part 7 which carries out the steel bar material from a is included.

By the way, the pair of horizontal rollers 3, 3a and the pair of vertical rollers 4, 4a are rigidly supported by the guide box 5, and the rigid body support structure is as follows.

First, the pair of horizontal rollers 3 and 3a are shown in FIG.
As shown in FIG. 3, the support shaft portions 8 and 8a are rotatably supported by ball bearings 9 and 9a, respectively. One end 81 of each of the support shaft portions 8 and 8a is fitted to the eccentric shaft portion 10 that is rotatably fitted in the support hole of the guide box 5 while being eccentric to the axis of the eccentric shaft portion. . On the other hand, eccentric shaft portions 11 and 11a that are rotatably supported by the guide box 5 are integrally formed on the other end sides of the support shaft portions 8 and 8a. It is eccentric with respect to the axis of the support shaft portions 8 and 8a. The eccentric shaft portions 11 and 11a of the horizontal rollers 3 and 3a protrude from the guide box 5 to the outside, and the worm wheels 12 and 12a are provided on the protrusions.
Are integrally formed. The worm wheels 12, 12a of the horizontal rollers 3, 3a are provided on a worm gear shaft 13 rotatably supported by a guide box 5 and have worm gears 14, 14a which are mutually reverse screws.
Are in mesh. With such a configuration, the worm gear shaft 13 is normally and reversely rotated, so that the inter-plane distance between the horizontal rollers 3 and 3a is adjusted.

The rigid support structure by the guide box 5 of the pair of vertical rollers 4 and 4a is as follows.

Support shaft portion 2 for a pair of vertical rollers 4, 4a
Ball bearings 29 and 29a on the 8 and 28a, respectively
It is rotatably supported via. As shown in FIG. 1, one end 281a of each support shaft portion 28, 28a has an eccentric shaft portion 30a rotatably fitted in a support hole of the guide box 5.
In addition, the eccentric shaft portion is eccentrically fitted to the shaft center of the eccentric shaft portion. On the other hand, an eccentric shaft portion 31a that is rotatably supported by the guide box 5 is integrally formed on the other end side of each of the support shaft portions 28 and 28a. It is eccentric with respect to the axial center of 28, 28a. The eccentric shaft portion 31a of each of the vertical rollers 4 and 4a projects from the guide box 5 to the outside. Worm wheels 32 and 32a are integrally formed on the respective protrusions. The worm wheels 32, 32a of the vertical rollers 4, 4a mesh with worm gears 34, 34a, which are provided on a worm gear shaft 33 rotatably supported by the guide box 5 and have mutually reverse screws. With such a configuration, the worm gear shaft 33 is rotated in the forward and reverse directions to adjust the surface distance between the vertical rollers 4 and 4a.

Reference numerals 40 and 40a in FIG. 2 are thrust washers, and reference numerals 41 and 41a in FIG.
Is a thrust washer.

Next, the operation of the embodiment having the above construction will be described.

The steel bar material that has passed through the rolling roll on the exit side of the final finishing stand of the bar wire mill is guided by the exit guide guide device 1 and enters the inlet guide part 6 of the double roller guide device 2, and this guide part 6 It is guided by and passes between the pair of horizontal rollers 3, 3a. At this time, the tip end portion of the steel bar member that is warped under the influence of gravity has a pair of horizontal rollers 3,
3a lifts to the height of the pass line and straightens the warp of the steel bar. The steel bar material that has passed through the pair of horizontal rollers 3 and 3a further passes between the pair of vertical rollers 4 and 4a. At this time, the left and right bends are corrected by the vertical rollers 4 and 4a at the tip of the steel bar bent to the left and right.

In this way, the warp and left and right bends of the tip of the steel bar are corrected.

The warp and left and right bends of the rear end of the steel bar are also corrected in the same manner as the front end.

In this way, the steel bar having the bent front and rear ends thereof is unloaded from the outlet-side guide portion 7.

Table 1 compares the end-bending correction device for bar steel with the bar wire mill according to the above-mentioned embodiment and Comparative Examples 1 to 3 with respect to the length of the tip-bending portion, the tip-bending amount and the cut-off length. The results are shown.

[0026]

[Table 1] It should be noted that in Table 1, Comparative Example 1 shows the exit guide device 1
And a double roller guide of V-V arrangement (using two pairs of vertical rollers), or a guide roller on the delivery side and a double roller guide of H-H arrangement (two pairs of horizontal rollers). The distance between the roll center axis of the rolling roll on the exit side of the final finishing stand of the bar mill and the roll center axis of the first set of rollers is larger than 350 mm. Comparative Example 2 is composed of a delivery guide device 1 and a V-V double roller guide, and the distance between the roll center axis of the rolling roll and the roll center axis of the first set of rollers is about 350 mm. It is a thing. Comparative Example 3 is the exit guide device 1 and V-H.
It is composed of an array of double roller guides, and the distance between the roll center axis of the rolling roll and the roll center axis of the first set of rollers is about 350 mm.

Each numerical value in Table 1 is an average value under each condition, the diameter of the steel bar is about 31 to 74 mm, and the total number of objects to be measured is about 150 to 200 for each arrangement.

As is clear from Table 1, in the case of the end bending straightening device for the steel bar by the bar wire mill according to the embodiment of the present invention, the length of the tip bending part and the length of the tip bending part are different from those of the other comparative examples. Minimal tip bending, resulting in the shortest cut-off length.

The present invention can be applied to bar wire mills other than the three-roll system.

[0030]

EFFECTS OF THE INVENTION According to the end-bending straightening device of the present invention, the end-to-end bending of a steel bar can be corrected while adjusting the inter-plane distance between the horizontal roller and the vertical roller. In a state where elasticity at high temperature is poor, the end portion of the bar steel member that has warped is lifted to the height of the pass line by the pair of horizontal rollers, and the warpage of the bar steel is corrected. Further, the ends of the steel bars bent to the left and right are straightened by the vertical rollers, and the bending to the left and right is corrected. Therefore, by correcting the end bend of the steel bar, it is possible to improve the yield and reduce the work of correcting the end bend off-line.

[Brief description of drawings]

FIG. 1 is a side view of an end curl correction device according to the present invention.

FIG. 2 is a plan view of a correction device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Delivery side guide guide device 2 Double roller guide device of H-V arrangement 3,3a A pair of horizontal rollers 4,4a A pair of vertical rollers 5 A guide box 8,8a Support shaft part 81 One end of a support shaft part 10,11,11a Eccentric shaft part 12,12a Worm wheel 13,33 Worm gear shaft 14,14a Worm gear 28,28a Support shaft part 281a One end of support shaft part 30a, 31a Eccentric shaft part 32,32a Worm wheel 34,34a Worm gear

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Yoshiaki Yamaguchi Inventor Yoshiaki Yamagata, Nishi-ku, Sapporo 13-12-12-13 Kotobushiki Sangyo Co., Ltd. (72) Inventor Noriyasu Kumagai 2--11-5 Kyobashi, Chuo-ku, Tokyo No. Pine Central Building Kotobuki Sangyo Co., Ltd. (72) Inventor Satoshi Kubota 13-12-12-13 cold, Nishi-ku, Sapporo-shi, Hokkaido Kotobuki Sangyo Co., Ltd., at a cold factory (56) Reference JP-A-3-47683 (JP, A) )

Claims (1)

[Claims] 1. A delivery guide guide device (1) arranged near a rolling roll on the delivery side of a final finishing stand of a bar wire mill to guide a steel bar, and a delivery guide device arranged near the delivery guide device. And a pair of horizontal rollers (3, 3a) through which the steel bar from the exit side guide device is passed, the double roller guide device (2) having an H-V arrangement.
And a pair of vertical rollers (4, 4a) for passing a steel bar from the horizontal roller. The horizontal roller and the vertical roller are rigidly supported by the guide box (5). The structure is such that the horizontal roller and the vertical roller are supporting shaft portions (8, 8a, 28, 28a), respectively.
Is rotatably supported by the one end (81, 2,
81a) is rotatable in the support hole of the guide box (5).
The eccentric shaft part (10, 30a) fitted to the eccentric shaft part
It is fitted eccentrically with respect to the shaft center,
On the other end side of (8, 8a, 28, 28a), the guide
Eccentric shaft portion (11, 11) rotatably supported by the box.
a, 31a) is formed, and the eccentric shaft portion (11, 11a) is formed.
a, 31a) has an axis centered on the supporting shaft portion (8, 8a, 2a).
8, 28a) is eccentrically supported with respect to the axis of the eccentric shaft portion (11, 11a, 31a).
The wheels (12, 12a, 32, 32a) are installed.
This worm wheel has a worm shaft (1
(3, 33) and worm gears (14, 14a, 34, 34a ) provided with opposite screws and meshing with each other are engaged with each other. .