JP5531772B2 - Steel sheet guide, hot straightening machine, and hot rolled steel sheet production line - Google Patents

Description

  The present invention relates to a steel sheet induction guide used for introducing a hot-rolled steel sheet into a hot straightening machine in a hot-rolled steel sheet production line, a hot straightening machine including the steel sheet induction guide, and the heat The present invention relates to a hot rolled steel sheet production line equipped with a straightening machine.

  The hot-rolled steel sheet is shipped after being corrected to flatness that satisfies customer requirements. The correction is first performed hot, and then a shape inspection is performed, and then cold correction is performed as necessary. Generally, when cooling a steel sheet after undergoing a hot rolling process, cooling unevenness due to temperature unevenness of the steel sheet or surface unevenness is likely to occur. It is likely to cause camber generation after cutting the steel sheet due to stress and variations in mechanical properties. Among steel plates, when cooling thick steel plates online, cooling unevenness particularly occurs in cooling. Since the flatness after cooling of the thick steel plate in which the cooling unevenness has occurred is lost, it is necessary to correct the flatness deterioration in the subsequent steps. When correcting the flatness of the steel sheet, a hot straightening machine equipped with a roller leveler or a press is used. However, the thick steel plate in the stage before being introduced into the hot straightening machine usually has a large warp upward or downward at its tip, and the thick steel plate with large warpage is It is difficult to introduce. Therefore, in order to obtain a thick steel plate having a shape that can be easily introduced into a hot straightening machine, it is necessary to remove the warpage before introducing it into the hot straightening machine.

  In order to remove the warpage of the steel sheet before it is introduced into the hot straightening machine, it is common to install a warp straightening device at the tip called a knock-down roll on the steel straight side of the hot straightening machine. For example, Patent Documents 1 and 2 disclose techniques related to a simple hot straightening machine in which a knock-down roll is added before a cooling device. Further, in Patent Document 3, a steel plate guide is installed on the steel sheet entrance side of the hot straightening machine, and the steel sheet is introduced along the guide into the hot rolling mill without performing warp correction by a knock-down roll. A technique for performing the straightening is disclosed.

JP-A-11-226642 JP 2002-11515 A JP 2009-248179 A

  In the warp removing step using the knock-down roll as disclosed in Patent Documents 1 and 2, as shown in FIG. 3 (a), the steel plate that has been conveyed in the direction of the arrow in the hot-rolled steel plate production line 41. When the tip part having the warpage of 43 passes through the lower part of the knock-down roll 40 installed in front of the hot straightening machine 42, as shown in FIG. The knock-down roll 40 is lowered in the direction of the arrow. When the knock-down roll 40 is lowered to a position where the warpage of the steel plate 43 can be suppressed, the steel plate 43 is pulled back (drawn) in the direction of the arrow as shown in FIG. Is removed.

  As described above, in the warp removing step using the knock-down roll, time for performing the operation of temporarily stopping the steel plate and further pulling it out in the direction opposite to the conveying direction is inevitably required. And that time affects the production efficiency of the steel sheet. On the other hand, if a steel sheet guide as disclosed in Patent Document 3 is installed, the problem of production efficiency that is a concern for warp removal by a knockdown roll is solved. However, a large force is applied when the steel plate collides with the steel plate guide. Since the steel plate guide is installed just before the hot rolling mill enters the steel plate, if the position of the steel plate guide is greatly displaced due to a collision, the steel plate may not be properly guided to the roll of the hot straightening machine. Yes, if the steel sheet cannot be properly guided to the roll of the hot straightening machine, it becomes impossible to perform hot straightening of the steel sheet.

  Therefore, the present invention provides a steel sheet guide that can properly guide a steel sheet to a hot straightening machine without temporarily stopping and withdrawing the sheet in the direction opposite to the conveying direction even with a warped steel sheet, and the steel sheet guide. It is an object of the present invention to provide a hot straightening machine provided with a guide and a hot rolled steel sheet production line provided with the hot straightening machine.

  As described above, methods for removing warpage of a steel plate in a hot rolled steel plate production line include a method using a knock-down roll and a method using a steel plate guide. Since the former method tends to reduce the production efficiency, the present inventors examined the latter method using a steel plate induction guide.

  As a result of diligent research, the inventors of the present invention appropriately divided the steel sheet guides into first roll guides that play the role of absorbing the collision force due to the collision of the steel sheets, and the steel sheets into the rolls of the hot straightener. The present invention has been completed by discovering that it is easy to properly guide the steel sheet to the roll of the hot straightening machine by adopting the form having the second guide that plays the role of guiding.

  The present invention will be described below. In order to facilitate understanding of the present invention, reference numerals in the accompanying drawings are appended in parentheses, but the present invention is not limited to the illustrated embodiments.

1st this invention is installed in the steel plate containing side of the hot straightening machine (2) with which a hot-rolled steel plate manufacturing line (1) is equipped, and is used in order to introduce a steel plate (3) into a hot straightening machine. A steel plate guide (10), a first guide (11), a second guide (12) installed downstream of the first guide and synchronized with a hot straightening machine; have a second guide pattern on the upstream side of the leading edge (12a) has a feature that it is located in the sky side and upstream side of the first guide pattern downstream of the tip edge (11a) It is a steel plate guide.

  Here, the “hot straightening machine (2)” may be any machine that can correct the flatness of the steel sheet (3), and specifically includes a machine equipped with a roller leveler or a press machine. The “steel plate guiding guide (10)” of the present invention is installed on the steel sheet entrance side of the hot straightening machine (2) and appropriately guides the steel sheet (3) to the hot straightening machine (2). The steel plate guide (10) has a first guide (11) and a second guide (12). The steel plate guide (10) of the present invention only needs to have these two guides (11, 12), and in addition to the two guides (11, 12), the warp of the steel plate (3) can be further improved. There may be provided other guides for reducing the size. In the present invention, the first induction guide (11) and the second induction guide (12) withstand the impact caused by the collision with the steel sheet (3) conveyed on the hot rolled steel sheet production line (1). The form is not particularly limited as long as it is a member that can be used. As the first guiding guide (11) and the second guiding guide (12), for example, a plate-like member made of a general material such as SS400 can be used.

  The “first induction guide (11)” withstands a collision with a steel plate tip caused by a large warp generated in the steel plate (3) processed by a hot rolling mill or a cooling device, and reduces the warp of the steel plate tip. . Even if it passes through the first guide (11), the warp of the steel plate tip cannot be completely removed. However, since the warpage of the steel plate that has passed through the first guide (11) is reduced, the impact at the time of the subsequent collision between the steel plate and the second guide (12) can be reduced. In order to receive an impact caused by a relatively large warp, the size of the first guide (11) is preferably larger than the size of the second guide (12). The size of the first induction guide (11) basically depends on the hot rolled steel sheet production line (1) to be installed. The width of the first guide (11) (in the direction substantially parallel to the width direction of the hot-rolled steel sheet production line (1) (the direction in the horizontal plane perpendicular to the conveying direction of the steel sheet (3); the same applies hereinafter)). The length (which is the same in the following) can be set to be approximately the same as the length in the width direction of the hot-rolled steel plate production line (1), and the vertical width (hot-rolled steel plate production) of the first induction guide (11). The length in the direction substantially parallel to the longitudinal direction of the line (1) (the direction parallel to the conveying direction of the steel plate (3). The same applies hereinafter) can be about 1500 to 2500 mm. Moreover, the thickness of the 1st guide | guide (11) should just be the thickness which can endure the impact of a collision with a steel plate (3). The first guide (11) may be in the form of a single plate, but may be reinforced with a backing material as disclosed in JP-A-2009-248179 to form a box shape. Moreover, what is necessary is just to install a 1st guide guide (11) so that the angle which a surface (11b) and a horizontal surface make may be about 10-30 degrees. When the warp of the steel plate (3) is large, the angle with respect to the horizontal plane may be increased. The first guide (11) may be configured such that its position can be easily changed by a lifting device such as a hydraulic device, or the position thereof may be fixed.

The “second guiding guide (12)” further reduces the warpage of the steel sheet whose warpage has been reduced by the first guiding guide (11), and appropriately guides the steel sheet to the hot straightening machine (2). . Therefore, the second guide (12) is installed immediately before the hot straightening machine (2) and on the downstream side of the first guide (11). In the present invention, the second guide (12) has a mechanism synchronized with the hot straightening machine (2). For example, when the hot straightening machine (2) is a roller leveler, it is necessary to adjust the roll interval according to the thickness of the steel plate (3). At this time, by directly connecting and integrating the second guide guide (12) and the roller leveler, the second guide guide (12) and the roller leveler can be synchronized without using a lifting device such as a hydraulic device. May be. In addition, when the roller leveler and the second guide guide (12) exist independently without being connected, the second guide guide is moved up and down in accordance with the adjustment of the roll interval, so that the second guide guide The position of the second guide guide is interlocked with the adjustment of the roll interval by using a lifting device such as a hydraulic device so that the position of the second guide guide (12) is adjusted to the position of the roll guide. The roller leveler may be synchronized.
The size of the second induction guide (12) basically depends on the hot rolled steel sheet production line (1) to be installed. The horizontal width of the second induction guide (12) can be set to be approximately the same as the length in the width direction of the hot rolled steel sheet production line (1), and the vertical width of the second induction guide (12) is 500 to 1200 mm. Can be about. Further, in the steel plate guide (10), since the warp of the steel plate (3) is reduced by the first guide (11), the steel plate (3) and the second guide (12) have a certain large angle. Even if it collides with, it is difficult to cause a big problem. Therefore, the installation angle (angle with respect to the horizontal plane) of the second guide (12) can be made larger than the installation angle of the first guide (11). What is necessary is just to install a 2nd guide guide (12) so that the angle which a surface (12b) and a horizontal surface make may be about 20-40 degrees.

  2nd this invention is a hot straightening machine (2) provided with the steel plate induction guide (10) of the said 1st this invention in the steel-sheet entrance side.

  According to the third aspect of the present invention, a hot rolling mill (31), a first hot straightening machine (32), a cooling device (33), and a second hot straightening machine (34) are arranged in this order, The hot-rolled steel sheet production line (30), wherein the first hot straightening machine and / or the second hot straightening machine is the hot straightening machine according to the second aspect of the present invention.

In the first aspect of the present invention, since a knock-down roll is not used, there is no need to temporarily stop and pull out in the direction opposite to the conveying direction even with a warped steel plate (3). Therefore, according to the first aspect of the present invention, the time required to remove the warpage of the steel plate (3) can be shortened, and the production efficiency of the steel plate can be improved. In addition, since the first present invention has a plurality of guides (11, 12), the steel plate (3) is particularly thick and has a large impact force due to a collision with the steel plate guide (10). Even so, it is possible to reduce the misalignment of the second guide (12), which plays a role of appropriately guiding the steel plate (3) to the roll of the hot straightening machine (2). It becomes possible to appropriately guide the steel plate (3) to the roll of the straightening machine (2). In addition, if the guide guide is not divided, the guide guide must be enlarged, and the balance of the roller leveler integrated with the guide guide may be harmed. Although difficult, in the first aspect of the present invention, since the guide guides are divided into a plurality, the guide guides (12) to be synchronized can be made small, and the synchronization control can be easily performed. Furthermore, in the first aspect of the present invention, the upstream end side (12a) of the second guide (12) is higher than the downstream end (11a) of the first guide (11). By being located on the upstream side, it is possible to prevent the steel plate (3) that has passed through the distal end side (11a) on the downstream side of the first guide (11) from escaping to the upper side of the second guide (12). Therefore, it becomes easy to perform hot straightening of the steel plate (3) without any trouble.

  According to 2nd this invention and 3rd this invention, by providing the steel plate induction guide (10) of said 1st this invention, the manufacturing efficiency of a steel plate can be improved, or a hot straightening machine (2, It is possible to provide a hot straightening machine (2, 32, 34) and a hot-rolled steel sheet production line (30) capable of improving the stability of the steel sheet introduction to 32, 34).

It is a figure which shows a part of hot-rolled steel plate production line 1 provided with the steel plate induction guide 10. FIG. It is a figure which shows the hot-rolled steel plate manufacturing line. It is a figure which shows a part of conventional hot-rolled steel plate manufacturing line 41 provided with the knockdown roll 40 on the steel-sheet entrance side.

In the present invention, in a hot-rolled steel sheet production line, even a steel sheet having warpage can be stably introduced into a hot straightening machine without temporarily stopping the steel sheet and pulling out in the reverse direction. A steel sheet guide is provided. Furthermore, a hot straightening machine and a hot rolled steel sheet production line provided with the steel sheet guide are provided.
Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.

1. FIG. 1 is a diagram schematically showing a part of a hot-rolled steel sheet production line 1 provided with a steel sheet induction guide 10 of the present invention. A straight arrow in FIG. 1 is a conveyance direction of the steel plate 3. In FIG. 1, the right side of the drawing is the upstream side, and the left side of the drawing is the downstream side.

  As shown in FIG. 1, the steel plate guide 10 of the present invention includes a first guide 11 and a second guide 12 (hereinafter, the first guide 11 and the second guide 12). And may simply be referred to as “steel guide 10”). The steel plate induction guide 10 is installed on the steel sheet entering side of the hot straightening machine 2 provided in the hot rolled steel plate production line 1 (hereinafter sometimes referred to as “production line 1”). The steel plate guiding guide 10 has a first leading edge 12a on the upstream side of the second guiding guide 12 so that it is positioned above and upstream of the leading edge 11a on the downstream side of the first guiding guide 11. A guide guide 11 and a second guide guide 12 are installed.

  As shown in FIG. 1 (a), the steel plate 3 that has been conveyed on the production line 1 in a warped state by the steel plate guiding guide 10 being provided on the steel straight side of the hot straightening machine 2 Before being introduced into the straightening machine 2, it collides with the first guide 11. After the steel plate 3 collides with the first guide guide 11 and is conveyed while being pressed by the first guide guide 11, the second steel plate 3 is warped to some extent as shown in FIG. Guided to guide guide 12. After the steel plate 3 collides with the second guide guide 12, it is conveyed while being pressed by the second guide guide 12, so that hot correction is performed in a state where warpage is removed to some extent as shown in FIG. Guided to machine 2.

  Thus, even if it is the steel plate 3 which has curvature by using the steel plate guidance guide 10, it introduce | transduces into the hot straightening machine 2 appropriately, without once stopping and drawing | extracting to the reverse direction of a conveyance direction. be able to.

Here, the first guiding guide 11 and the second guiding guide 12 both play a role of pressing the steel plate 3, while the first guiding guide 11 and the second guiding guide 12 each play an individual role.
The first guide 11 collides with the steel plate 3 having a warp conveyed through the production line 1 and receives the first impact. In particular, when the thickness of the hot-rolled steel sheet 3 is large, the impact is considerable. The first guide 11 receives this and plays the role of passing the steel plate 3 to the second guide 12.
The second guide 12 has a function of synchronizing with the hot straightening machine 2. With this function, the second guide 12 can appropriately introduce the steel plate 3 into the hot straightening machine 2. Here, since the steel plate 3 is passed from the first guide 11 to the second guide 12, the impact of the steel plate 3 on the second guide 12 is applied to the first guide 11 by the steel plate 3. Smaller than impact. If the impact is large, the above-described function may be destroyed and synchronization may not be achieved.
By the first guiding guide 11 and the second guiding guide 12 playing the respective roles, even if the impact when the steel plate 3 collides with the steel plate guiding guide 10 is large, the steel plate 3 can be appropriately heated. Can lead to 2. Therefore, the use of the steel plate guide 10 makes it possible to manufacture a stable steel plate.

  In the steel plate guide 10, the first guide 11 and the second guide 12 are preferably capable of adjusting their installation angles. As a method for adjusting the angle, it is conceivable to adjust by an apparatus (not shown) for attaching the first guide guide 11 and the second guide guide 12. As a specific angle adjustment range of the first guide 11, when viewed from the side, the surface 11 b of the first guide 11 and the steel plate conveyance direction (usually the horizontal direction. .) Is preferably in the range of 10 to 30 °. If this angle is less than 10 °, it may be difficult to handle a steel plate having a large warp. If the angle exceeds 30 °, it is difficult to guide the steel plate 3 to the hot straightening machine 2. In addition, there is a possibility that the space above the first guide 11 cannot be used effectively. Moreover, the 2nd guide 12 can be installed so that the angle which the surface 12b of the 2nd guide 12 and the steel plate conveyance direction may make in the range of 20-40 degrees in a side view.

  The first guide 11 and the second guide 12 are plate-like bodies. However, the surface does not necessarily have to be a plate-like body like the second guide 12 shown in FIG. 1, and a part thereof is seen in side view like the first guide 11 shown in FIG. May be a plate-like body having an obtuse angle. In particular, the first guide 11 is preferably a plate-like body with a part of the downstream side having an obtuse angle in a side view. Due to such a shape, the impact on the second guide guide 12 due to the rebound of the warp of the steel plate 3 that occurs after the tip of the steel plate 3 reaches the tip side 11 a on the downstream side of the first guide 11. Can be reduced.

2. Hot straightening machine The hot straightening machine 2 of the present invention is provided with a steel plate guide 10 on the side containing the steel plate. By setting it as this form, as mentioned above, even if it has the steel plate 3 which has curvature, it can introduce the steel plate 3 into the hot straightener 2 appropriately, without once stopping and drawing | extracting to the reverse direction of a conveyance direction. it can. Therefore, according to the hot straightening machine 2 of the present invention, the time required to remove the warpage of the steel plate 3 before introducing the steel plate 3 into the hot straightening machine 2 can be shortened. Production efficiency and stability of steel sheet introduction into the hot straightening machine 2 can be improved.

3. Hot Rolled Steel Plate Production Line FIG. 2 is a diagram schematically showing a hot rolled steel plate production line 30 (hereinafter referred to as “production line 30”) of the present invention. In FIG. 2, the right side of the drawing is the upstream side, and the left side of the drawing is the downstream side. As shown in FIG. 2, the production line 30 includes a hot rolling mill 31 and a first hot straightening machine provided with a steel plate guide 10 (first guide 11 and second guide 12) on the side containing the steel plate. 32, the cooling device 33, and the second hot straightening machine 34 provided with the steel plate guide 10 (first guide 11 and second guide 12) on the steel plate entrance side are arranged in this order. .

  In the production line 30, as shown in FIG. 2 (a), the steel plate 35 that has undergone the rolling process by the hot rolling mill 31 is conveyed in a warped state and installed on the entry side of the first hot straightening machine 32. It collides with the steel plate guiding guide 10 (the first guiding guide 11 and the second guiding guide 12). Then, the steel plate 35 that has collided with the steel plate guiding guide 10 (the first guiding guide 11 and the second guiding guide 12) is warped to some extent, and as shown in FIG. It is introduced into the straightening machine 32. Furthermore, the steel plate 35 is subjected to a cooling process by the cooling device 33, and as shown in FIG. 2 (c), the steel plate induction guide installed on the entry side of the second hot straightening machine 34 in a warped state. 10 (first guiding guide 11 and second guiding guide 12). Then, the steel plate 35 that has collided with the steel plate guide 10 (the first guide 11 and the second guide 12) is warped to some extent, and as shown in FIG. It is introduced into the straightening machine 34.

  As described above, in the production line 30, even if the steel plate 35 is conveyed to the front of the hot straightening machines 32 and 34 in a state having warpage through the hot rolling mill 31 and the cooling device 33, The steel plate 35 can be stably introduced into the hot straightening machines 32 and 34 without temporarily stopping and withdrawing in the direction opposite to the conveyance direction. Therefore, according to the production line 30, the time required for removing the warp of the steel plate 35 can be shortened, and the production efficiency of the steel plate can be improved.

  In the said description regarding the production line 30, although the form with which the steel plate induction guide 10 was equipped in both the 1st hot straightening machine 32 and the 2nd hot straightening machine 34 was illustrated, if the curvature of a steel plate is not large, whichever A steel plate guiding guide may be provided on the steel sheet entering side of one of the hot straightening machines.

  Further, if there is a steel plate guide, there is no need to stop the steel plate 35 once. For this reason, even if it arrange | positions the cooling device 33 and the 2nd hot straightening machine 34 so that the front-end | tip of the steel plate 35 may be straightened with the 2nd hot straightening machine 34, and a rear end may be cooled with the cooling device 33. Good. In other words, this hot-rolled steel sheet production line even for the steel sheet 35 whose overall length (length in the longitudinal direction (direction parallel to the conveying direction of the steel sheet 3)) is longer than the installation interval between the cooling device 33 and the second hot straightening machine 34. Can be handled. By doing so, the production line 30 itself can be made compact.

  In the above description related to the present invention, the first leading edge 12 a on the upstream side of the second guiding guide 12 is positioned above the upstream leading edge 11 a on the downstream side of the first guiding guide 11. Although the steel plate guide 10 in the form in which the guide guide 11 and the second guide 12 are installed is illustrated, the steel plate guide of the present invention is not limited to this form. However, it is easy to prevent the steel plate 3 that has passed through the distal end side 11a on the downstream side of the first guide 11 from escaping to the upper side of the second guide 12 and perform hot correction of the steel plate without any trouble. From the viewpoint of making the second guide guide 12, the upstream side 12 a on the upstream side of the second guide 12 is positioned above the upstream side 11 a on the downstream side of the first guide 11 so that the first side 12 a is upstream. It is preferable to install one guide guide 11 and a second guide guide 12.

  Moreover, although this invention solves the subject of a knockdown roll, the knockdown roll may be installed in the hot rolled steel plate manufacturing line which has the steel plate induction guide of this invention.

  In a hot rolled steel sheet production line, a hot straightening machine equipped with a roller leveler is installed after the cooling device, and the steel sheet guide of the present invention is installed on the steel sheet entering side of the hot straightening machine to correct the warpage of the steel sheet. And flatness was corrected. Although the steel plate that has undergone the cooling process has warpage, any steel plate is stably introduced into the roller leveler by the steel plate induction guide of the present invention, and the flatness is corrected by correcting the flatness with the roller leveler. A high steel plate was obtained. In installing the steel sheet guide according to the present invention, the installation angles of the first guide guide and the second guide guide with respect to the horizontal plane were changed to 10 °, 20 °, and 30 ° to correct the steel plate. As a result, at any angle, the steel plate was stably introduced into the roller leveler (hot straightening machine) by the steel plate induction guide of the present invention, and a steel plate with high flatness was obtained.

  While the present invention has been described in connection with embodiments that are presently the most practical and preferred, the present invention is not limited to the embodiments disclosed herein. However, it can be changed as appropriate without departing from the spirit or concept of the invention that can be read from the claims and the entire specification, and a steel plate guide with such a change, a hot straightening machine equipped with the steel plate guide, and A hot rolled steel sheet production line should also be understood as being included within the scope of the present invention.

  The present invention can be used when manufacturing a hot-rolled steel sheet used for automobiles, home electric appliances, machine structures, buildings, and the like.

DESCRIPTION OF SYMBOLS 1 ... Hot rolled steel plate production line 2 ... Hot straightening machine 3 ... Steel plate 10 ... Steel plate induction guide 11 ... First induction guide 12 ... Second induction guide 30 ... Hot rolled steel plate production line 31 ... Hot rolling mill DESCRIPTION OF SYMBOLS 32 ... 1st hot straightening machine 33 ... Cooling device 34 ... 2nd hot straightening machine 35 ... Steel plate 40 ... Knock down roll 41 ... Hot-rolled steel plate production line 42 ... Hot straightening machine 43 ... Steel plate

Claims (3)

It is a steel sheet induction guide that is installed on the steel sheet entering side of a hot straightening machine provided in a hot rolled steel sheet production line, and is used to introduce a steel sheet into the hot straightening machine,
A first guide pattern, is disposed downstream of the first guide pattern have a second guide pattern for synchronization with the hot straightener, upstream of the leading edge of the second induction guide A steel plate guide according to claim 1, wherein the guide guide is located on the upstream side and the upstream side of the tip side on the downstream side of the first guide. A hot straightening machine provided with the steel sheet guide according to claim 1 on the steel sheet containing side. A hot rolling mill, a first hot straightening machine, a cooling device, and a second hot straightening machine are arranged in this order, and the first hot straightening machine and / or the second hot straightening machine is claimed. A hot-rolled steel sheet production line, which is the hot straightening machine according to Item 2.

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