JPH0716698B2 - Guided method and device for rolled steel - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a guide device for guiding a rolled steel material to a rolling mill reliably and without any trouble in the rolling of bar steel such as wire rods and bar steels. (EN) Provided are a guide method and a device thereof effective for preventing the occurrence of a surface damage of a product and a cross-section dimensional accuracy defect caused by a misroll or a rolled steel material falling or swinging due to a tip of the steel sheet.

[0002]

2. Description of the Related Art Conventionally, as a measure for improving the cross-sectional shape and dimensional accuracy of rolled steel materials such as wire rods and bar steels, high rigidity of rolling mills and development and practical use of 3- and 4-roll sizing mills have been advanced. . At the same time, a device for guiding the rolled steel material to the rolling mill in a normal spatial position and posture has been improved and developed and put into practical use.

For example, in the method described in Japanese Patent Publication No. 60-40933 (hereinafter referred to as "first conventional example"), a pair of guide rollers is provided at the tip of the rolled steel material on the advancing direction side.
A hydraulic cylinder is installed on the rear side of the line connecting the fulcrum shafts of the pair of roller holders (opposite to the traveling direction of the rolled steel material), and the hydraulic pressure is used to adjust the distance between the pair of roller holders. It is disclosed that the guide roller gap is controlled to prevent the occurrence of misrolls due to the rolling steel material hitting and to prevent the generation of cross-sectional shape / dimensional accuracy defects and surface scratches due to the collapse of the rolled steel material during guided guidance. ing.

In the first conventional example, it is said that the steel material is held with a predetermined binding force in order to prevent the rolled steel material from falling. However, in practice, when a load load exceeding the set tie force level is applied to the guide roller, the rolled steel material may collapse, but a method for selecting the set value of the tie force is not disclosed.

In the rolling apparatus described in Japanese Utility Model Publication No. 61-1929 (hereinafter referred to as "second conventional example"), a roll holding member is used as a means for improving the dimensional accuracy of the sizing mill for bar steel. It is disclosed that the set bolt can apply prestress to improve the rigidity of the roll holding member. At the same time, it is also disclosed that this method absorbs "backlash" or "play" of the steel strip rolling apparatus and reduces the spread of the roller gap.

[0006]

When the device disclosed in the second conventional example is applied, the elastic force of the reaction corresponding to the increase amount of the roller gap based on the situation and the posture of the rolled steel material falling during the guiding and guiding is applied. Are spontaneously added to the rolled steel from the guide rollers. Therefore, as long as the guide device has elastic strength and rigidity, there is no risk of the rolled steel material falling down due to improper selection of the tie force level as in the first conventional example. In putting the guide method of the first conventional example into practical use, there are generally the following problems in addition to the selection of the tying force level. That is, since the guide device is usually installed in a very narrow space before and after the rolling mill, the device itself has a small size and a flexible structure, and has a disadvantage of low rigidity.

The low rigidity corresponds to a large gap between the guide rollers with respect to a constant load.
Therefore, it means that the rolled steel material in the guided guide that is vibrating or vibrating easily falls. Recently, controlled rolling / controlled cooling, low temperature rolling, or rolling of a wide range of special steels has become widespread, and the load applied to the guide device tends to increase. Therefore, high rigidity of the guide device is desired. An object of the present invention is to increase the rigidity of the guide device, prevent the rolled steel material from falling over during the guide, improve the cross-sectional shape and dimensional accuracy of the product, and prevent the occurrence of surface scratches.

[0008]

A feature of the guide method according to the present invention is that both fulcrum shafts of a pair of roller holders, to which guide rollers are attached, respectively, at the front part of the rolling steel material in the traveling direction before the start of rolling. 1 by the front prestressing mechanism and the rearward prestressing mechanism that are provided by connecting the connecting line
A predetermined prestress is applied to the pair of roller holders, the roller gap is adjusted according to the size of the rolled material, and the rollers are arranged between the front and rear prestressing mechanisms, and both prestressing mechanisms are respectively arranged in the same direction. The guide roller gap is opened by the fluid pressure cylinder that moves the position, the roller gap is adjusted by the fluid pressure cylinder during rolling, the fluid force of the fluid pressure cylinder is adjusted, and the rolling force is adjusted by a predetermined binding force during rolling. Hold the rolled steel material, and increase or decrease the distance between the pair of roller holders corresponding to the front and rear prestressing mechanism accompanying the movement of the fluid pressure cylinder on the front and rear side prestressing mechanism side. They are in opposite directions. The features of the guide device according to the present invention are: a pair of roller holders having guide rollers attached to the front portions in the traveling direction of the rolled steel material; a fulcrum shaft serving as a rotation center of the pair of roller holders; A front prestressing mechanism and a rear prestressing mechanism, which are arranged in front of and behind the line connecting the fulcrum axes, respectively, and a front pressure roll and a rear pressure which are provided corresponding to both the front and rear prestressing mechanisms. It is provided with a roll and a fluid pressure cylinder arranged between both the front and rear prestressing mechanisms and connected to both prestressing mechanisms. Each of the front and rear prestressing mechanisms includes a tightening body and a roller gap adjusting shaft screwed into the tightening body in a reverse screw relationship. One end face of each roller gap adjusting shaft is an inclined end face, and the inclined end faces of both front roller gap adjusting shafts are inclined with respect to either the direction intersecting with the guide rollers or the opening direction. The inclined end faces of the rear roller gap adjusting shafts are inclined in the other direction. Both the front and rear pressure rolls are attached to the pair of roller holders and are in contact with the inclined end faces of the front and rear roller gap adjusting shafts. The fluid pressure cylinder is provided with supports on both front and rear sides that can move back and forth in the same direction.
The front support is connected to the front tightening body, and the rear support is connected to the rear tightening body.

[0009]

[Operation] The roller gap is adjusted by operating the front and rear prestressing mechanisms. This adjustment sets the roller gap to be slightly larger than the size of the rolled steel material. During rolling, the fluid pressure cylinder is operated to adjust the roller gap. By manipulating the tightening bodies of the front and rear prestressing mechanisms, the front and rear roller gap adjusting shafts are moved in the direction in which the roller holder is expanded. By this operation, prestress is applied to the roller holder through the pressure roll, and the rigidity of the guide device is increased. The rigidity adjustment is determined by the amount of movement of the roller gap adjusting shaft. Since it is particularly important to increase the rigidity between the guide rollers, the front prestressing mechanism is mainly operated. By actuating the fluid pressure cylinder, the support moves in the same direction, which causes the inclined end surface of the roller gap adjusting shaft to move, causing the roller holder to swing about the fulcrum shaft, which results in a wide roller gap. It grows and narrows.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. First, an embodiment of the guide device will be described. Rolling material traveling direction of a pair of roller holders 1, 1 (right direction in the figure))
Guide rollers 2 and 2 are rotatably attached to the front end portions on the side. A front prestressing mechanism 4 and a rear prestressing mechanism 5 are provided in front of and behind the line connecting the fulcrum shafts 3, 3 of the pair of roller holders 1, 1 in the traveling direction of the rolled material. A fluid pressure cylinder 6 is arranged between the prestressing mechanisms, and both prestressing mechanisms are connected by this fluid pressure cylinder.

The front prestressing mechanism 4 will be described. This mechanism is composed of a turnbuckle, and a front center buckle 41, which is a front tightening body, has a pair of front roller gap adjusting shafts 42, 4 which are in a reverse screw relationship with each other.
Two are combined. The pair of roller gap adjusting shafts 42, 42 are arranged in a straight line, one end surface of each roller gap adjusting shaft faces inside the center buckle 41, and the other end surface abuts on the front pressure rolls 7, 7. There is. The other end surfaces of the pair of front roller gap adjusting shafts 42, 42 that are in contact with the front pressure rolls 7, 7 are inclined surfaces 42.
a and 42a.

The structure of the rear prestressing mechanism 5 is substantially the same as that of the front prestressing mechanism 4. Reference numeral 51 is a rear center buckle, 52 is a rear roller gap adjusting shaft, and 52a is an inclined end surface of the rear roller gap adjusting shaft 52. The inclined end surface 52a is in contact with each rear pressure roll 8.

The front pressure roll 7 and the rear pressure roll 8 are attached to the front portion and the rear portion of the roller holder 1, respectively.

The inclined end faces 42a, 42a of the front roller gap adjusting shafts 42, 42 are set so that the inclined directions thereof intersect with each other toward the guide rollers 2, 2. Also, the inclined end surfaces 52a, 52a of the rear roller gap adjusting shafts 52, 52
The inclination directions of are set so as to open toward the guide rollers 6 and 6. In this way, the inclined directions of the inclined end faces 42a and 52a of the front and rear center buckles 41 and 51 are opposite to each other.

In the fluid pressure cylinder 6, brackets 63 and 64 having a planar U-shape in the illustrated example, which form a support, are attached to the respective tips of rods 61 and 62 extending in both front and rear directions. The front bracket 63 is the front center buckle 4
1 and the rear bracket 64 is connected to the rear center buckle 51. Since the rods 61 and 62 of the fluid pressure cylinder 6 move in the same direction, the prestressing mechanisms 4 and 5 move their positions in the same direction with this movement. With the above configuration, the rod 6 can be operated by the operation of the fluid pressure cylinder 6.
As the brackets 63, 64 move back and forth in the same direction via the rollers 1, 62, the roller gap adjusting shafts 42, 52 of both the front and rear prestressing mechanisms 4, 5 move back and forth in the same direction. At this time, the pair of front roller gap adjusting shafts 42, 42
Distance D between the inclined end surfaces 42a, 42a of the front and the front pressure rolls 7, 7, and the contact distance Da between the inclined end surfaces 52a, 52a of the pair of rear roller gap adjusting shafts 52, 52 and the rear pressure rolls 8, 8 Da The increasing and decreasing directions of and are opposite to each other in the front and rear prestressing mechanisms 4 and 5 because the inclination angles are opposite. Since it is in the opposite direction,
As the contact distance D increases, the contact distance Da decreases.

By rotating the front center buckle 41, the front roller gap adjusting shaft 42 moves in the axial direction. For example, when it moves away from the center buckle 41, the pressure roll 7 is pressed along with this movement. Push the roller holder 1 apart. By rotating the rear center buckle 52, the rear roller gap adjusting shaft 52 moves in the axial direction, and for example, when it moves in a direction away from the rear center buckle 52, the pressure roll 8 is pressed along with this movement, and the roller holder Push 1 apart. As a result of being spread in this way, a predetermined prestress is applied to the pair of roller holders 1, and the guide guide device is made highly rigid. If the brackets 63 and 64 are moved back and forth by the operation of the fluid cylinder 6,
Since the roller gap adjusting shafts 42 and 52 move back and forth with the movement of the front bracket 63, the inclined end surface 42
Similarly, a and 52 also move, and the guide roller gap is adjusted by this operation. Further, the fluid force of the fluid pressure cylinder 6 is adjusted to hold the rolled steel material under rolling with a predetermined binding force.

In FIG. 2, 9 is an entry sleeve,
10 is a rolling roll, 11 is a base, and 12 is a guide box.

Next, the guidance method will be described. The rolled steel material passes through the entry sleeve 9 and the guide rollers 2,
2 is guided to the rolling rolls 10, 10.

When the rolled steel material is guided and guided, a roller gap adjusting operation is performed in advance. That is, in order to match the gap of the guide roller 2 with the size of the rolled steel material, the front and rear center buckles 41, 51 are operated to adjust the roller gap adjusting shaft 42,
52 is moved to adjust the contact distances D and Da. In this adjustment, the roller gap is set to be slightly larger than the dimension of the rolled steel material from the viewpoint of preventing the rolled steel material from being caught or misrolled.

After the roller gap has been adjusted, the roller holder 1 is prestressed. That is, the front and rear center buckles 41, 51 are adjusted, the pressure rollers 7, 8 are pressed by the roller gap adjusting shafts 42, 52, and the roller holders 1, 1 are moved in a direction to be expanded, so that the roller holders are preloaded. Generate stress. Since it is particularly important to increase the rigidity between the guide rollers 2 and 2 for adjusting the rigidity, the front prestressing mechanism 4 is mainly operated. Thus, with the roller holders 1, 1 pre-stressed, the gap between the guide rollers 2, 2 is set larger than the dimension of the rolled steel material, and the roller holders are on standby, and at the moment the tip of the rolled steel material passes through the guide device. When the sensor detects, the fluid pressure cylinder 6 is operated to move the positions of the center buckles 41 and 51 in the same direction (to the left in the illustrated example), and the guide roller gap is slightly narrowed. The rolled steel material is bound between the rollers 2 and 2. After the rolled steel material passes between the guide rollers 2 and 2, the fluid pressure cylinder 6 is operated to reduce the roller gap. The predetermined binding force for holding the rolled steel material being rolled between the guide rollers 2 and 2 is the fluid pressure cylinder 6
This is done by adjusting the fluid force of.

Further, the load applied to the guide rollers 2 and 2 is less than the binding force level in a normal rolling operation, and the rigidity of the guide device is high due to the effect of the above-mentioned prestress, so that the opening of the roller gap can be suppressed. Therefore, the tilt angle of the vibrating rolled steel material is limited to a very small range. As a result, the sectional shape and dimensional accuracy of the rolled steel material are improved, and the occurrence rate of surface scratches is reduced.

According to an experimental example, the guiding guide apparatus according to the present invention was applied to a finishing stand row NT mill for wire rods, and the rigidity was compared with that of the roller guide apparatus described in Japanese Patent Publication No. 2-42006. This is about 50% higher than that of the roller guide device of. As a result, the finish size is 5.5φ
The roundness of the cross section of the material was improved by about 30%, and there was no occurrence of misroll during the wire rolling operation for about 5 months. The definition of the circularity of this cross section is as follows. Roundness = (maximum diameter-minimum diameter) / average diameter

[0023]

According to the guiding and guiding method of the present invention, a predetermined prestress is applied to the roller holder by both the front and rear prestressing mechanisms provided with the line connecting the fulcrum shafts of the pair of roller holders interposed. As a result, the rigidity of the guide device can be increased to guide the rolled material, and the roller gap can be adjusted according to the dimensions of the rolled material. It is possible to improve the cross-sectional shape and dimensional accuracy and prevent the occurrence of surface scratches.The front and rear prestressing mechanisms can be moved in the same direction by fluid pressure cylinders to easily widen the roller gap. It is possible to adjust the roller gap, and to adjust the fluid force of the fluid pressure cylinder to hold the rolled steel material under rolling with a predetermined binding force. Widely such as changing the dimensions of the steel and flexible can respond, yet it is possible to improve the controllability of the guidance. These effects are also obtained in controlled rolling, low temperature rolling and wide range of special steel rolling.

According to the guide device of the present invention, even if the structure is relatively delicate, pre-stress can be applied to the roller holder by both the front and rear pre-stressing mechanisms provided at predetermined positions, so that the rigidity of the device is increased. It is possible to prevent the rolled steel material from falling over during guiding and
It is possible to improve dimensional accuracy and prevent surface scratches. Since the size of the roller gap can be adjusted according to the size of the rolled steel material through both the front and rear prestressing mechanisms and the front and rear pressure rolls, the occurrence of misrolls can be prevented.

[Brief description of drawings]

FIG. 1 is an enlarged plan view showing an embodiment of the present invention.

FIG. 2 is a front view showing an embodiment of the present invention.

[Explanation of symbols]

 1 roller holder 2 guide roller 3 fulcrum shaft 4 front prestressing mechanism 41 tightening body (center buckle) 42 front roller gap adjusting shaft 42a inclined end face 5 rear prestressing mechanism 51 tightening body (center buckle) 52 rear roller gap adjusting shaft 52a Inclined end face 6 Fluid pressure cylinder 63 Support body (bracket) 64 Support body (bracket) 7 Front pressure roll 8 Rear pressure roll D Distance between contacts Da Distance between contacts

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takaya Suzuki 13-12-12-13 cold from Nishi-ku, Sapporo-shi, Hokkaido Kotobuki Sangyo Co., Ltd.

Claims (2)

[Claims] 1. A front prestressing mechanism and a rear portion, which are provided by sandwiching a line connecting both fulcrum shafts of a pair of roller holders, each of which has a guide roller attached to the front portion in the traveling direction of the rolled steel material, before the start of rolling. The prestressing mechanism of No. 1 applies a predetermined prestress to the pair of roller holders, adjusts the roller gap according to the dimensions of the rolled steel material, and arranges it between the front and back prestressing mechanisms and both prestresses. The guide roller gap is opened by the fluid pressure cylinders that move the positions of the additional mechanisms in the same direction, and during rolling, the fluid pressure cylinder is operated to adjust the roller gap, and the fluid force of the fluid pressure cylinder is adjusted. Hold the rolled steel material under rolling with a predetermined binding force and adjust it to the pre-stressing mechanism in each of the front and rear directions accompanying the movement of the fluid pressure cylinder. A method for guiding and guiding a rolled steel material, characterized in that the increasing and decreasing directions of the distance between a pair of corresponding roller holders are opposite to each other on the front and rear prestressing mechanism sides. 2. A pair of roller holders, each of which has a guide roller attached to a front portion in the traveling direction of the rolled steel material, a fulcrum shaft serving as a rotation center of the pair of roller holders, and a line connecting the fulcrum shafts. The front prestressing mechanism and the rear prestressing mechanism, which are respectively arranged in front and back, and the front pressure roll and the rear pressure roll, which are provided corresponding to both the front and rear prestressing mechanisms, and the front and rear, respectively. It is provided between the prestressing mechanisms and is equipped with a fluid pressure cylinder that is connected to both the front and rear prestressing mechanisms. It has a roller gap adjusting shaft screwed into the body in a reverse screw relationship, and one end face of each roller gap adjusting shaft is an inclined end face,
The inclined end faces of both front roller gap adjusting shafts have an inclination angle in either the direction intersecting with the guide rollers or the opening direction, and the inclined end faces of both rear roller gap adjusting shafts incline in the other direction. Both the front and rear pressure rolls are attached to the pair of roller holders and are in contact with the inclined end faces of the front and rear roller gap adjusting shafts. The guide guide device for rolled steel material is characterized in that the front support member is connected to the front tightening member, and the rear support member is connected to the rear tightening member.