WO2020036315A1

WO2020036315A1 - Roller device capable of correcting shape of plate

Info

Publication number: WO2020036315A1
Application number: PCT/KR2019/008216
Authority: WO
Inventors: 최용준
Original assignee: 주식회사 포스코
Priority date: 2018-08-17
Filing date: 2019-07-04
Publication date: 2020-02-20
Also published as: KR102131503B1; KR20200020478A

Abstract

The present invention relates to a roller device capable of correcting the shape of a plate such as a steel plate so as to contribute to improving product quality. The roller device comprises: a pair of roller members which are disposed facing each other with a plate therebetween, have rotary shafts extending toward both sides, and rotate while compressing the plate; a plurality of pushers which respectively press the rotary shafts of the pair of roller members in the directions in which the plate is compressed; and bender pushers which are positioned between the rotary shafts of the pair of roller members and simultaneously press the rotary shafts in the opposite directions of the pressing directions of the pushers.

Description

Roller device that can correct the shape of plate

The present invention relates to a roller device capable of correcting the shape of a plate such as a steel sheet, for example.

In general, a pair of pinch rolls may be used in a hot rolling line to assist in a coiling process. These pinch rolls can bend to transfer a plate, such as a steel plate, to a mandrel located downstream of it, and the bent plate is wound around the mandrel between the mandrel and the wrapper roll surrounding it. When forming, tension can be applied between the pinch roll and the mandrel.

As shown in FIG. 1, in addition to the pinch rolls described above, a pair of additional pinch rolls 7 may be disposed upstream of the pinch rolls 4 on the mandrel 5 inlet. These additional pinch rolls make it possible to stably add tension when the plate 1 exits the rolling mill 2 and the tension is released, and the mand which the wrapper roll 6 surrounds when the thick plate is coiled in the mandrel Press the thick plate together with the pinch roll on the side of the roller to make the bending smooth. In FIG. 1, reference numeral 3 denotes a cooling unit.

As such, the pinch roll serves as a means for assisting the coiling of the mandrel, and serves to provide bending and tension, thereby limiting the shape of the plate. Therefore, when the plate member having a bad shape passes through the pinch roll, there is a problem that a telescope defect due to a bad shape occurs during coiling.

Related prior art is the invention disclosed in Republic of Korea Patent Publication No. 1498893 B1 (registered February 27, 2015).

Accordingly, an object of the present invention is to provide a roller device capable of correcting the shape of a plate such as a steel sheet so as to contribute to the improvement of product quality.

A roller device according to an embodiment of the present invention, a pair of roller members which are disposed to face each other with a plate between, having a rotation axis extending to both sides, and rotates while pressing the plate; A plurality of pushers for pressing the rotary shafts of the pair of roller members in a direction in which the plate is pressed; And a bender pusher positioned between the rotary shafts of the pair of roller members to simultaneously press the rotary shafts in a direction opposite to the pressing direction of the pusher.

As described above, according to the present invention, the wave shape in the width direction in the plate can be corrected in real time, for example, when used as a pinch roll to help the coiling process to stabilize the coiling process and at the same time The effect of improving the shape quality in a short time is obtained.

1 is a schematic view showing a portion of a typical hot rolling line.

2 is a view showing a roller device according to an embodiment of the present invention.

3 is a view showing a roller apparatus according to another embodiment of the present invention.

4 is a diagram illustrating simulation analysis results of the roller device, in which (a) is no bender pusher, and (b) is a bender pusher.

Hereinafter, the present invention will be described in detail through exemplary drawings. In adding reference numerals to the elements of each drawing, it should be noted that the same elements are denoted by the same reference numerals as much as possible even if displayed on different drawings. In addition, in describing the present invention, if it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

2 is a view showing a roller device according to an embodiment of the present invention. As shown therein, the roller apparatus according to the embodiment of the present invention is disposed to face each other with the plate 1 therebetween, and has a rotating shaft 11 extending in both sides along the longitudinal direction, and rotates while pressing the plate. A pair of roller members 10; A plurality of pushers 20 for pressing the rotary shafts of the pair of roller members in a direction in which the plate is pressed; And a bender pusher 30 positioned between the rotary shafts of the pair of roller members to simultaneously press the rotary shafts in a direction opposite to the pressing direction of the pusher.

The pair of roller members 10 are installed parallel to and opposed to each other. Each rotating shaft 11 extending in the longitudinal direction of each roller member includes a first choke 13 having a bearing (not shown) and positioned adjacent to the main body 12 of the roller member, and a bearing (not shown). And a second choke 14 positioned adjacent to the free end of the rotating shaft to rotatably support the rotating shaft and the roller member.

Optionally, since each roller member 10 contacts a plate 1 such as a steel sheet, the body 12 of the roller member may be made of a material such as, for example, carbon steel for mechanical construction.

In addition, the surface of each roller member 10 is concave curved in a conical shape so as to convexly convex in an arc shape toward the longitudinal center from the longitudinal end side, or in a concave arc shape toward the longitudinal center at the longitudinal end side. It may have a crown shape.

As described above, each roller member 10 has a crown shape, so that the grip force on the plate 1 can be strengthened.

The plurality of pushers 20 may press the rotating shaft 11 of the roller member 10, respectively. As shown in FIG. 2, these pushers may be arranged to individually press the first choke 13 located on the axis of rotation of each roller member.

For example, the pusher 20 may be configured as an actuator each having an actuating rod 21, such as a hydraulic cylinder or an electric actuator may be adopted. At this time, the operating body 22 of the actuator is connected to the frame (not shown) is mounted, the operating rod may be coupled to the first choke (13).

3 is a view showing a roller apparatus according to another embodiment of the present invention. As shown therein, in another embodiment of the present invention, only the structure of the pusher 20 is different and the remaining components are the same as those of the above-described embodiment. Thus, in the description of the roller device according to another embodiment of the present invention, the same components as the roller device according to the above-described embodiment will be given the same reference numerals and the detailed description of the structure and function will be omitted.

The pusher 20 includes a connecting bar 23 having both ends coupled to the first choke 13 of the roller member 10, and a driving unit 24 having an actuating rod 25 to apply a force to the connecting bar. can do. In this case, as the driving unit, a hydraulic cylinder or an electric actuator may be adopted. The driving rod 25 of the driving unit is connected to the connection bar, and the operating body 26 may be connected to and mounted to a frame (not shown).

By such a pusher 20, the roller device of the present invention simultaneously presses each roller member 10 symmetrically on both sides of the plate 1, thereby simultaneously pressing both sides of the plate, for example, the upper and lower surfaces, together with the transfer of the plate. You can do it.

By the way, the pressing force of the pusher 20 acts on the first choke 13 supporting the rotating shaft 11 of the roller member 10, thereby causing the roller member to bend. As such, when the roller member is bent, an imbalance occurs in the force applied to the plate.

That is, the force for pressing both ends of the plate is relatively large, while the force for pressing the center of the plate is relatively small. As a result, the tip of the plate becomes relatively thin in thickness, and edge waves are generated.

The roller device of the present invention is characterized by including a bender pusher 30 for pressing in the direction opposite to the pressing direction of the pusher 20. For example, the bender pusher may be located between the rotation axis of the upper roller member and the rotation axis of the lower roller member, respectively, on both sides in the longitudinal direction of the roller member 10. The bender pusher may simultaneously apply bending stress to the rotation shaft 11 of each roller member 10 in the direction opposite to the pressing direction of the pusher.

As shown in FIGS. 2 and 3, the bender pusher 30 may be arranged to press the second choke 14 located on the rotation shaft 11 of each roller member 10.

For example, the bender pusher 30 is located between the second chokes 14 adjacent to each other due to the arrangement of the pair of roller members 10, so that the pair of actuating rods 31 acting opposite to each other. It can be configured as a bidirectional actuator with At this time, the operating body 32 of the actuator is connected to the frame (not shown) via the support bar 33, each operating rod may be coupled to the second choke.

By the bender pusher 30, the bender pusher 30 applied to the second choke 14 when the pusher 20 presses the rotary shaft 11 of the roller member 10 in the roller apparatus of the present invention. When increasing the force of the pressing force acts as a force to lift the both ends in the longitudinal direction of the roller member can be controlled toward the thickened thickness of the plate member (1).

The roller device according to the present invention configured as described above is provided with a pusher 20 and a bender pusher 30 capable of applying a pressing force to the pair of roller members 10 having a simple structure and applied to the plate 1. By being able to adjust the widthwise load, it is possible to correct and control the shape defects occurring in the width direction of the plate.

In particular, when the pusher 20 presses the rotating shaft 11 of the roller member 10, the roller member is bent and the surface pressing the plate member 1 on the roller member is flat due to the crown shape formed on each roller member. Can be done. In addition, both ends of the lengthwise direction of the roller member are lifted by the bender pusher 30, so that the thickness of the plate member to be pressed can be controlled to be approximately uniform.

In this simulation, when the diameter of the main body 12 of the roller member 10 is 710 mm and the diameter of the rotating shaft 11 is 240 mm, the pressure applied by the pusher 20 is 400 tons, and the bender pusher 30 is applied. The assumption is made that the pressure applied is 50 tons.

In the absence of a bender pusher, if only 400 tons of pressing force by the pusher 20 are applied, a deformation of 0.49 mm occurs at both ends in the longitudinal direction of the roller member (see FIG. 4 (a)), but the bone with the bender pusher is applied. In the roller device according to the invention, deformation of 0.40 mm occurs at both ends in the longitudinal direction of the roller member 10 (see FIG. 4B). Therefore, it can be confirmed that a thickness increase of 90 μm occurs at both ends of the plate 1 to be pressed.

Furthermore, in the absence of a bender pusher, the roller member deforms into a locus of quadratic function, but in the roller apparatus according to the present invention to which the bender pusher is applied, the roller member 10 deforms into a locus of quadratic function. Can be seen.

On the other hand, if the roller device according to the present invention is applied to an additional pinch roll disposed on the exit side of the rolling mill 2 in the hot rolling line, the roller device can correct the shape defects of the plate material 1 such as steel sheet on both sides in real time during operation. As a result, in addition to functions such as tension retention and bending, there is an advantage in that the coil can be coiled into a stable shape.

As described above, according to the present invention, the wave shape in the width direction in the plate can be corrected in real time, for example, when used as a pinch roll to assist the coiling process, to stabilize the coiling process and at the same time improve the shape quality of the product. The effect can be improved in a short time.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the specification and the drawings are not intended to limit the technical spirit of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

As described above, the present invention is useful in, for example, a coiling process for forming a coil in a hot rolling line.

Claims

A pair of roller members disposed to face each other with plate members interposed therebetween, having a rotation shaft extending to both sides, and rotating while pressing the plate members;

A plurality of pushers for pressing the rotary shafts of the pair of roller members in a pressing direction of the plate; And

A bender pusher positioned between the rotary shafts of the pair of roller members to simultaneously press the rotary shafts in a direction opposite to the pressing direction of the pusher

Roller apparatus comprising a.
The method of claim 1,

And a second choke having a bearing and positioned adjacent to the main body of the roller member, and a second choke having a bearing and positioned adjacent to a free end of the rotating shaft.
The method of claim 2,

Wherein the plurality of pushers are actuators each having an actuating rod, the rollers being arranged to press the first choke individually.
The method of claim 2,

The pusher comprises a connecting bar having both ends coupled to the first choke of the roller member, and a driving unit having an actuating rod to apply a force to the connecting bar.
The method according to claim 3 or 4,

The plurality of pushers are roller devices, characterized in that to press each roller member at the same time symmetrically on both sides of the plate.
The method of claim 2,

And the bender pusher is arranged to press the second choke positioned on the axis of rotation of each roller member.
The method of claim 6,

The bender pusher is a roller apparatus, characterized in that the bidirectional actuator having a pair of operating rods that operate opposite each other.
The method of claim 1,

The main body of the roller member has a convex or concave crown shape toward the longitudinal center from the longitudinal end side.
The method of claim 1,

The roller device is a roller device, characterized in that applied to the pinch roll.