CN113165034B

CN113165034B - Device for forming long-side front end surface of unequal angle steel, method for forming long-side front end surface, method for manufacturing same, and hot finish rolling equipment

Info

Publication number: CN113165034B
Application number: CN201980078751.6A
Authority: CN
Inventors: 胁田健太郎; 三好武; 田中弘敏
Original assignee: JFE Steel Corp
Current assignee: JFE Steel Corp
Priority date: 2018-12-27
Filing date: 2019-11-26
Publication date: 2023-08-18
Anticipated expiration: 2039-11-26
Also published as: KR102466903B1; CN113165034A; WO2020137317A1; JPWO2020137317A1; JP6897877B2; KR20210083325A

Abstract

The application provides a technology capable of improving the perpendicularity of a long-side front end surface of unequal angle steel during hot rolling. The forming roll (11) has a peripheral surface (11A) which is in contact with a front end surface (9A) of a long side (9) of the unequal angle steel formed by finish rolling and presses the front end surface (9A), and the peripheral surface (11A) which is in contact with the front end surface (9A) has an inclined surface shape which can apply a reaction force to the front end surface (9A) towards the length direction of the long side (9) of the unequal angle steel, and the front end surface (9A) of the long side (9) is pressed and formed by the peripheral surface.

Description

Device for forming long-side front end surface of unequal angle steel, method for forming long-side front end surface, method for manufacturing same, and hot finish rolling equipment

Technical Field

The present application relates to a technique for manufacturing a scalene angle steel by hot rolling. And more particularly to a technique for forming the long-side front end surface of the unequal angle steel into a right angle with respect to the long side by heat.

Background

When a material to be rolled is rolled into unequal angle steel by hot finish rolling, the front end surface of the angle steel is also formed by a rolling roller, but the accuracy of the obtained shape with respect to the target shape is sometimes insufficient.

As a technique for forming the distal end portion of the angle steel, for example, a technique described in patent document 1 is known.

Patent document 1 describes the following: the long side end of the hot rolled unequal angle steel is clamped by a roller and a carrier roller, and the long side end is guided by a guide roller, and the short side end is pressed and formed by a forming part of a forming roller.

Patent document 1: japanese patent application laid-open No. 2015-77624

The unequal angle steel is used as a structural material for ships, bridges, and the like, for example. In this case, the end of the long side (web) of the angle steel is usually welded directly to another member. At this time, perpendicularity (perpendicularity) of the distal end surface with respect to the longitudinal direction of the long side has a great influence on weldability. Therefore, the shape accuracy of the long side end portion is more strict than that of the short side end portion.

Conventionally, in a downstream process after finishing hot rolling of a material to be rolled, a long-side end portion is formed as needed. However, after the completion of the hot rolling process, the forming process is additionally performed to increase the number of processes, and thus the manufacturing cost increases.

Here, the technique described in patent document 1 is a technique of press-forming the short side end portion of the unequal angle steel. That is, the technique described in patent document 1 is a concept of forming short side ends on the same line as a pass line, and is not a technique of forming long side ends.

In general, the long side of the unequal angle steel is thinner than the short side. Therefore, if the pressing force applied to the long side end portion for the end portion forming is excessive, the long side may be excessively warped. Therefore, the technique of forming the short-side end portion cannot be changed to the technique of forming the long-side end portion as it is. Thus, it is considered that the long-side end portion requires additional study for obtaining an appropriate shape.

Disclosure of Invention

The present application has been made in view of the above-described problems, and an object of the present application is to provide a technique capable of improving the perpendicularity of the long-side front end surface of a non-uniform angle steel during hot rolling.

In order to solve the problems, an aspect of the present application is to provide a forming roll disposed on an outlet side of a hot finishing mill for unequal angle steel, the forming roll having a peripheral surface that abuts against and presses a long side front end surface of the unequal angle steel formed by finish rolling, the peripheral surface that abuts against the front end surface being a shape capable of imparting a reaction force to the front end surface in a longitudinal direction of the long side of the unequal angle steel, and the long side front end surface being press-formed by the peripheral surface.

According to one aspect of the present application, the perpendicularity of the long-side end surface of the unequal angle steel during hot rolling can be improved.

Drawings

Fig. 1 is a diagram showing an example of a process for manufacturing unequal angle steel.

Fig. 2 is a conceptual diagram showing an example of the arrangement position of the long-side end surface forming apparatus, where (a) is a plan view and (b) is a front view.

Fig. 3 is a side view illustrating the forming roll.

Fig. 4 is a diagram illustrating a molding apparatus having a molding roll.

Fig. 5 is a plan view showing a relationship between the rotation shaft and the eccentric shaft.

Fig. 6 is a diagram showing an example of the pass of the rolling rolls of the final stand.

Fig. 7 is a side view showing a modification of the forming roll.

Detailed Description

Next, embodiments of the present application will be described with reference to the drawings.

For example, as shown in fig. 1, the unequal angle steel of the present embodiment is produced by passing through a production process including a heating process 1, a rough rolling process 2, a middle rolling process 3, and a finish rolling process 4. In the heating step 1, for example, a steel material as a rolling material is heated in a batch-type or continuous heating furnace. The rolled material heated in the heating step 1 is then rolled in the rough rolling step 2, the intermediate rolling step 3, and the finish rolling step 4, and is formed into the shape of the target angle steel. The rough rolling step 2, the intermediate rolling step 3, and the finish rolling step 4 include, for example, a grooved roll mill having grooved rolls, a general-purpose roll mill having a plurality of pairs of rolling rolls, and the like.

In the present embodiment, the end face forming step 4A is provided as a part of the finish rolling step 4. The distal end face forming step 4A is performed by a long-side distal end face forming apparatus (hereinafter, also simply referred to as a forming apparatus). That is, the manufacturing process of the unequal angle steel of the present embodiment includes a forming device downstream of the final stand of the hot finishing mill for forming the unequal angle steel, as a rolling facility of the finish rolling process 4.

Structure

Fig. 2 is a diagram showing an example of the arrangement position of the long-side front-end surface forming apparatus, where (a) is a plan view and (b) is a front view. In fig. 2 (b), the forming device 7 is illustrated in perspective.

For example, as shown in fig. 2, the forming device 7 is provided at a position downstream of the rolling rolls 5 of the final stand in the hot finishing mill and midway in the rolling direction among the installation positions of the side guides 6.

Unlike patent document 1, the molding device 7 of the present embodiment does not have a guide roller for guiding the unequal angle steel 8 during press molding of the end surface. As a result, the forming device 7 can be disposed close to the rolling rolls 5 of the final stand by the corresponding amount.

As shown in fig. 3 and 4, the forming apparatus 7 of the present embodiment includes a forming roll 11 disposed on the outlet side of the hot finishing mill.

The forming roller 11 has a peripheral surface 11A that is inclined by pressing the front end surface 9A of the long side 9 of the unequal angle steel 8 formed by finish rolling, and the peripheral surface 11A that is inclined by pressing the front end surface 9A is shaped so that a reaction force F can be applied to the front end surface 9A in the longitudinal direction of the long side 9 of the unequal angle steel 8. Reference numeral 10 denotes the short side of the unequal angle steel 8.

Specifically, the inclined peripheral surface 11A is preferably formed to have an inclination angle that can be brought into contact with the front end surface 9A so that an angle with respect to the longitudinal direction of the long side 9 is within ±2 degrees from a right angle perpendicular to the longitudinal direction.

Here, the pass of the rolling roll 5 of the final stand is of the shape shown in fig. 6. The angle of the pass of the rolling roll 5A for rolling the front end surface 9A of the long side 9 of the unequal angle steel 8 with respect to the horizontal direction is set to α. The angle α is set to an angle at which the front end surface 9A is perpendicular to the long side 9.

Further, it is preferable to design the inclined angle θ of the inclined peripheral surface 11A of the forming roller 11, which is in contact with the front end surface 9A, to be in the range of an angle α±2 degrees with respect to the horizontal.

The forming roller 11 is disposed with a central axis (shown by a chain line in fig. 3) oriented in the vertical direction, for example, and as shown in fig. 4, a roller shaft 12 is disposed coaxially with the central axis. Thereby, the forming roller 11 is rotatably supported by the roller shaft 12 about the roller shaft 12 as a central axis.

Here, the embodiment has a driving and reversing mechanism for driving and reversing the roller shaft 12 of the forming roller 11 so that the reaction force F applied to the peripheral surface 11A of the forming roller 11 in the longitudinal direction of the long side 9 of the unequal angle steel 8 becomes an appropriate magnitude. As an example of the advancing and retreating mechanism, an example of applying the eccentric mechanism will be described below. In this case, eccentric shafts 13A, 13B extending vertically are integrally arranged on the upper end surface and the lower end surface of the roller shaft 12. The upper and lower eccentric shafts 13A, 13B are coaxially arranged.

The roller shaft 12 and the eccentric shafts 13A and 13B are eccentric as seen in a plan view shown in fig. 5.

The lower eccentric shaft 13B is supported by a bottom plate portion 15 that forms a part of the side guide 6 via a bearing 14. The upper eccentric shaft 13A is supported by a fixing plate 17 via a bearing 16. The rotation driving device 18 is connected to the upper eccentric shaft 13A, and drives the rotation driving device 18, whereby the centers of the eccentric shafts 13A, 13B are rotationally displaced.

The rotation driving device 18 may be exemplified by a hydraulic driving device, an electric motor device, and the like.

The eccentric mechanism composed of the eccentric shafts 13A, 13B constitutes an advancing and retreating mechanism.

The rotation driving device 18 is configured to supply a reaction force to the control unit 19 when the upper eccentric shafts 13A and 13B are driven to rotate, and to drive the eccentric shafts 13A and 13B to rotate by a rotational displacement amount corresponding to a rotational displacement command from the control unit 19.

The control unit 19 operates in predetermined sampling units. The control unit 19 calculates a rotational displacement in which the reaction force input to the rotary drive device 18 at the time of rotary drive is brought close to a range of reaction force values corresponding to a range of preset pressing force so as to converge the pressing force on the peripheral surface 11A formed of the inclined surface to the range of preset pressing force, and supplies the calculated rotational displacement to the rotary drive device 18.

The range of the set pressing force is set to be equal to or greater than a size capable of forming the distal end surface 9A, and the long side 9 of the unequal angle steel 8 is not deflected or only a pressing force value allowing deflection is generated. The allowable inward deflection refers to deflection in elastic deformation.

The description above has been made on the example of applying the eccentric mechanism as the advancing and retreating mechanism. Here, in the present application, the advancing and retreating mechanism advances and retreats the roller shaft 12 of the forming roller 11 so that the reaction force F applied to the peripheral surface 11A of the forming roller 11 in the longitudinal direction of the long side 9 of the unequal angle steel 8 becomes an appropriate magnitude. The advancing and retreating mechanism is not limited to the eccentric mechanism described above. For example, the distance between the unequal angle steel 8 and the roller shaft 12 may be adjusted by linearly moving the roller shaft 12 in parallel in a horizontal plane. In this case, the reaction force F applied to the peripheral surface 11A of the forming roller 11 in the longitudinal direction of the long side 9 of the unequal angle steel 8 is set to an appropriate level.

An edge sensor (not shown) may be disposed on the outlet side of the final rack, and the width direction position of the front end surface 9A of the long side 9 in plan view may be detected by the edge sensor. In this case, the control unit 19 may calculate a rotational displacement amount corresponding to the target pressing force (set pressing force range) based on the detection, and may supply a rotational displacement command to the rotational drive device 18.

Here, as shown in fig. 7, the peripheral surface 11A of the forming roller 11 may be a cylindrical surface, and the rotation axis of the forming roller 11 itself may be inclined at the same angle as the inclination angle θ with respect to the vertical. In this case, the longitudinal direction of the long side 9 is perpendicular to the rotation axis of the forming roller 11.

Action and others

In the present embodiment, when finish rolling is performed on a material to be rolled, the inclined peripheral surface 11A of the forming roll 11 disposed on the outlet side of the finish rolling mill is brought into contact with the front end surface 9A of the long side 9 of the unequal angle steel 8 formed by finish rolling, and press forming of the front end surface 9A is performed.

At this time, the front end face 9A of the long side 9 of the rolled material portion discharged from the final stand of the finishing mill is pressed and formed in the longitudinal direction (axial direction) of the long side 9 in a state where the rolled material is rolled by the finish rolling.

Since the material to be rolled is rolled by the finish-rolled rolling roller, a guide roller for guiding the unequal angle steel is not required when the front end surface 9A is press-formed.

In addition, the forming roll 11 can be disposed close to the rolling roll 5 of the final stand, and in this regard, no guide roll is required for press forming. The closer the arrangement is, the more pressing for shaping the front end surface 9A can be performed in a more stable state.

In the present embodiment, the forming roller 11 has a advancing and retreating mechanism composed of an eccentric mechanism that advances and retreats the peripheral surface 11A in contact with the distal end surface 9A in the longitudinal direction along the long side 9.

Therefore, in the present embodiment, the pressing force for pressing the distal end surface 9A of the material to be rolled can be adjusted as needed, and the rolling of the material to be rolled from the rolling mill can be reduced. The bending of the rolled material is caused by a minute change in the position of the rolled material that is discharged from the outlet side of the rolling mill and is caught by the rolls, a change in the temperature of the rolled material during rolling, or the like, and is caused to bend in a correct traveling direction.

Here, the inclination angle θ of the peripheral surface 11A formed of the inclined surface is determined according to the size of the unequal angle steel 8 as the material to be rolled, and has each inclination angle. Therefore, the forming roller 11 is prepared according to the type of the angle steel 8 to be manufactured, and the forming roller 11 may be replaced and used according to the angle steel to be manufactured.

In the present embodiment, the forming roller 11 is movable in the horizontal direction and presses the material to be rolled as necessary, so that the deflection of the material to be rolled discharged from the rolling mill can be reduced.

As described above, in the present embodiment, by disposing the forming device 7 including the forming roller 11, it is possible to save space, improve restrictions on workability, and improve formability of the front end surface 9A by bringing the installation position close to the vicinity of the rolling mill.

Further, by allowing the forming roller 11 to be movable in the horizontal direction and adjusting the pressing force for pressing the material to be rolled as necessary, the formability of the front end surface 9A can be improved, and the deflection of the material to be rolled from the rolling mill can be reduced.

Here, the reason why the angle of the inclined surface for forming is preferably designed to be within a range of right angles (90 degrees) ±2° orthogonal to the longitudinal direction of the long side 9 is as follows.

That is, in the case where the material passing position is changed in the right-left direction due to the bending of the rolled material in the range where the angle of the inclined surface exceeds ±2° with respect to the right angle, there is a possibility that the distal end shape of the long side 9 does not become the right angle or becomes a convex shape toward the upper surface or the lower surface of the long side 9.

In order to reduce the above-described bending and form the distal end of the long side 9 at a right angle, it is preferable to appropriately control the pressing force to be pressed against the distal end surface 9A of the long side 9. For example, in the case of an unequal angle steel having a thickness of 8mm to 15mm on the long side as the main application object of the present application, it is preferable that the forming roller 11 presses the distal end surface 9A of the long side 9 with a force of 500kgf or more. However, in the case where the pressing force exceeds 1000kgf, the long side 9 may be convex toward the upper surface or the lower surface, and therefore the pressing force is preferably 1000kgf or less.

In the present application, the distance between the roll axis of the rolling roll 5 and the roll axis of the forming roll 11 in the final stand is preferably a distance at which the rolling roll 5 and the forming roll 11 do not contact, and is within 1200mm in the horizontal plane and in the pass line direction (up-down direction in fig. 2 (a)). This is because, when the rolling roll 5 and the forming roll 11 are brought close to each other in this way, the possibility of the material to be rolled being allowed to turn increases by controlling the angle formed by the front end surface 9A of the long side 9 of the angle steel 8, which is the material to be rolled, and the peripheral surface 11A of the forming roll 11 to be within a desired range with respect to the right angle.

As described above, the molding device 7 of the present embodiment is not provided with a guide roller for guiding the unequal angle steel 8 at the time of press molding of the end surface, unlike patent document 1. Therefore, the forming device 7 can be disposed downstream of the rolling rolls 5, and the separation distance L between the rolling rolls 5 and the forming rolls 11 of the final stand can be set to, for example, 800mm or less. The lower limit value of the separation distance L can be set to any value as long as it is within a range where the rolling roll 5 and the forming roll 11 do not interfere with each other. That is, the forming device 7 can be disposed close to the rolling roller 5 within a range where it does not interfere with the rolling roller 5. In the case where the separation distance L is reduced to, for example, 800mm or less, the end forming by the forming device 7 can be performed in a state where the angle steel 8, which is a material to be rolled, is strongly restrained by the rolling rolls 5, which is more preferable.

Further, there is an advantage that the shorter the separation distance L between the forming device 7 and the rolling roller 5, the shorter the length of the cut ends of the forefront end portion and the rearmost end portion, which cannot be formed into the end portion by the forming device 7, is at the leading end portion and the rearmost end portion of the unequal angle steel 8.

The entire contents of the priority, japanese patent application 2018-244617 (the 2018 12-27 application) are hereby incorporated by reference as if fully set forth herein. The present application is not limited to the above embodiments, and modifications of the embodiments based on the above disclosure will be apparent to those skilled in the art.

Description of the reference numerals

1 … heating step; 2 … rough rolling process; 3 …, a rolling process; 4, … finish rolling; 4A … front end face forming step; 5. 5a … rolling rolls; 6 … side guides; 7 … forming means; 8 … unequal angle steel; 9 … long sides; 9A … front end face; 11 … forming rolls; 11a … peripheral surfaces; 12 … roller; 13A, 13B … eccentric shafts (eccentric mechanisms); 18 … rotary drive means; 19 … control part; f … reaction force.

Claims

1. A device for forming the front end face of the long side of unequal angle steel is characterized in that,

has a forming roll arranged on the outlet side of a hot finishing mill for unequal angle steel,

the forming roller has a peripheral surface which is abutted against and pressed against the long side of the unequal angle steel formed by finish rolling,

the peripheral surface abutting against the front end surface is shaped so as to apply a reaction force to the front end surface in the longitudinal direction of the long side of the unequal angle steel,

the separation distance between the rolling roller and the forming roller of the final stand of the hot finishing mill is within 800 mm.

2. The apparatus for forming the long-side front end surface of unequal angle steel according to claim 1, wherein,

the peripheral surface that is in contact with the distal end surface is a surface shape that can be in contact with the distal end surface so that the angle with respect to the longitudinal direction of the long side is within ±2 degrees of a right angle perpendicular to the longitudinal direction.

3. The long-side front end face forming apparatus for unequal angle steel of claim 1 or 2, wherein,

the forming roller has an advancing and retreating mechanism for advancing and retreating the peripheral surface abutting against the front end surface in the direction along the length direction of the long side.

4. The long-side front end face forming apparatus for unequal angle steel of claim 1 or 2, wherein,

the forming roller is a vertical roller, and the peripheral surface abutting against the front end surface is an inclined surface inclined relative to the rotation axis of the forming roller.

5. A hot finish rolling device for unequal angle steel is characterized in that,

a long-side front end surface forming device comprising the unequal angle steel of any one of claims 1 to 4.

6. A manufacturing method of unequal angle steel is characterized in that,

the unequal angle steel is manufactured by using the hot finish rolling equipment according to claim 5.

7. A method for forming the front end face of the long side of unequal angle steel is characterized in that,

the long-side end face forming device for the unequal angle steel of any one of claims 1 to 4 is used for forming the long-side end face of the unequal angle steel formed by finish rolling.