JP2007313529A - Equipment for manufacturing thick steel plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the productivity of the whole equipment for manufacturing a thick steel plate by efficiently operating both of a rolling mill and a shearing machine. <P>SOLUTION: In the equipment M for manufacturing the thick steel plate which has a rolling line P having the rolling mill 1 for rolling a hot slab S and a cooling system 3 for cooling the rolled thick steel plate I and a shear line 4 having a plurality of shearing machines such as a dividing shearer 4a for shearing the cooled thick steel plate I into the dimensions of a product, an edge cutting shearer 4b and a finishing shearer 4e, grinding machines 6 for grinding the surface of a rolling roll of the rolling mill 1 are provided on the rolling mill 1, and a conveying apparatuses 5 for conveyance for retreating a part of the thick steel plates from the shear line 4 to a retreating place 5a out of the line and returning the thick steel plate I which is retreated to the retreating place 5a out of the line, is provided on the shear line 4, preferably on the upstream side of the edge cutting shear 4b. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to equipment for manufacturing thick steel plates.

  Generally, a steel plate manufacturing facility includes a heating furnace that heats a slab, a rolling mill that rolls the heated slab into a thick steel plate of a custom product thickness, and a cooling device that forcibly cools the thick steel plate with cooling water. And a cooling bed that cools the steel plate by allowing it to cool, and a shearing machine that shears the cooled steel plate to a custom product size.

  In such a steel plate manufacturing facility, as the slab is rolled with the rolling roll of the rolling mill, the surface of the roll that is in contact with the slab wears out and a step is generated between the portion that does not contact the slab. Therefore, the slab to be rolled is sequentially rolled from a wide width to a narrow width, and when it is completed, the rolling slab is replaced with a rolling roll in which the level difference is ground offline. The rolling rolls were replaced in a timely manner, and it took a lot of time and labor to replace the rolling rolls, which hindered improvement in productivity.

  Further, as a factor that hinders the productivity of the rolling mill, there is controlled rolling (a rolling method in which rolling is temporarily stopped during rolling, the steel plate temperature is waited until it reaches a predetermined temperature, and then rolling is started again).

  In addition, since a plurality of custom products are usually ligated to a single steel plate rolled by a rolling mill, as described above, each sheared product is sheared to a size for each custom product using a shearing machine. Since the edge is sheared so that the custom product has a rectangular shape, the length of shear increases as the number of custom products to be embraced on one steel plate increases or the length of the steel plate increases. The productivity of was low.

  In order to improve the productivity of the steel plate manufacturing equipment, in the rolling mill, for example, the step generated in the rolling roll is ground with a grindstone during online rolling to reduce the replacement frequency of the rolling roll. A method to do this has been proposed (Patent Document 1).

In the case of controlled rolling, for example, there is a method of forcibly cooling a thick steel plate waiting for temperature with water to reduce the temperature waiting time and rolling another thick steel plate during this temperature waiting time. It has been proposed (Patent Document 2).
JP 2005-205448 A JP 11-319908 A

  As described above, various measures for improving productivity in a rolling mill are being carried out, but they are not yet sufficient. Moreover, as for the productivity improvement measures for the shearing machine, there are almost no effective measures.

  An object of the present invention is to efficiently operate both the rolling mill and the shearing machine to improve the productivity of the entire production equipment for thick steel plates.

  As a result of various investigations to improve the productivity of the entire steel plate manufacturing facility, the present inventors have determined that the shear plate of the preceding steel plate has been sheared even though the subsequent steel plate has arrived. Is incomplete and severe, the thick steel plate stays up to the rolling mill, and rolling in the rolling mill cannot be performed (shearing machine neck), and the shearing of the preceding thick steel plate In spite of having been completed, there is a case where the subsequent thick steel plate has not arrived at the shearing machine and cannot start shearing (rolling machine neck), and the operating rate of the shearing machine has not been fully demonstrated. There was found.

  As a result of investigating the cause, for example, the control rolled material has a long rolling time per thick steel plate, and if this continues several times, the number of thick steel plates on the conveying line between the rolling mill and the shearing machine decreases. Therefore, the shearing waiting time in the shearing machine becomes long (rolling machine neck). In addition, if a long steel plate with many custom products is joined, the total length of shearing becomes longer, and it takes time to shear one steel plate, and a lot of steel plates are retained on the transfer line ( She found a shearing machine neck). In particular, it has also been found that when the rolling mill is subjected to thick steel plate width rolling order regulation as described above, a rolling mill neck tends to occur.

  The present invention has been made based on such knowledge. That is, the means (1) for solving the above-mentioned problems according to the present invention includes a rolling mill for rolling a hot slab, a rolling line having a cooling facility for cooling the rolled thick steel plate, and the cooled thick steel plate as a product size. In a steel plate manufacturing facility comprising a shearing line having a plurality of shearing machines such as a split shearing machine, an edge cutting shearing machine, and a finishing shearing machine, the rolling roll surface of the rolling mill is ground in the rolling mill. A grinder is provided, and the steel plate on the shearing line is retracted and conveyed from the shearing line to a retreat location outside the line, and the steel plate retreated to the retreating location outside the line is returned and conveyed to the shearing line. It is the manufacturing equipment of the thick steel plate characterized by providing the apparatus.

  Further, the means (2) for solving the above-mentioned problem according to the present invention is characterized in that in the shear line composed of a plurality of shearing machines such as a split shearing machine, an edge cutting shearing machine, a vertical shearing machine, a finishing shearing machine, etc. An apparatus is provided between the split shearing machine and the ear-cut shearing machine on the downstream side thereof, and the thick steel sheet that is retracted and transported by the transporting apparatus is a thick steel sheet after being split sheared by the split shearing machine. This is a thick steel plate manufacturing facility described in the means (1).

  According to the present invention, on the upstream side of the shearing machine, it becomes possible to prevent a large amount of the rolled steel plate from staying, and the stoppage of the rolling mill due to this can be greatly reduced, and the rolling mill is operated. The rate is improved, and it becomes possible to improve the productivity of the steel plate manufacturing facility, and the effect in this field is great.

  Hereinafter, each facility of the embodiment of the present invention will be specifically described with reference to FIGS. FIG. 1 is a configuration diagram showing a configuration of a thick steel plate manufacturing facility M according to an embodiment of the present invention. The manufacturing facility M performs various processes while conveying the slab S (thick steel plate I) from the upstream (lower left in FIG. 1) to the downstream (upper right in FIG. 1) along the conveying path L indicated by the black solid line. It is configured as follows. The manufacturing facility M has a rolling line P for rolling the slab S to the thick steel plate I in order from the upstream to the downstream of the conveying path L, the cooling floor 3 for air-cooling the thick steel plate I to 100 ° C. or less, and the thick steel plate I as a rectangle. It has the structure which has arrange | positioned the shear line 4 which shears to the custom-made product size.

  The rolling line P includes a rolling mill 1 that rolls a slab S heated in a heating furnace (not shown) to form a thick steel plate I, and a cooling device 2 that forcibly cools the thick steel plate I with cooling water. Are arranged in order from upstream to downstream.

  The shearing line 4 has a configuration in which a split shearing machine 4a, an edge-cutting shearing machine 4b, a longitudinal shearing machine 4c, and a finishing shearing machine 4e are arranged in this order from upstream to downstream of the conveying path L of the thick steel plate I. Further, in the shear line 4, as described later, the thick steel plate I is transported from the shear line 4 to the outside of the shear line 4, and the thick steel plate I is transported from the outside of the shear line 4 to the shear line 4. A possible transport device 5 is provided.

  The division shearing machine 4a is a shearing machine capable of shearing the thick steel plate I along the width direction and dividing the steel plate I into a plurality of steel plates each having a predetermined length in the longitudinal direction (that is, the conveying direction).

  The edge-cutting shearing machine 4b is a shearing machine capable of shearing the thick steel plate I along the longitudinal direction and cutting off both ends in the width direction of the thick steel plate called a so-called ear.

  The longitudinal shearing machine 4c is a shearing machine capable of shearing the thick steel plate I along the longitudinal direction and dividing it into a plurality of steel plates each having a length in the width direction that is finally the length of the custom product. .

  The finishing shearing machine 4e shears the thick steel plate I along the width direction, and a plurality of thick steel plates whose length in the longitudinal direction (that is, the conveying direction) is the length in the longitudinal direction of each custom product to be finally shipped. It is a shearing machine that can perform final finishing by dividing into two.

  Next, the conveying device 5 (also called a thinning device) will be described. The conveying device 5 conveys the thick steel plate I, which is sheared by the split shearing machine 4a and then conveyed to the edge-cutting shearing machine 4b, to a retracting table 5a provided on the side of the shearing line 4 as desired (thinning out). Can be temporarily placed. Further, the thick steel plate I temporarily placed on the evacuation table 5a can be returned to the shear line 4 as desired. The conveying device 5 includes a gate-type gantry 5b disposed so as to straddle the shear line 4 and the evacuation platforms 5a on both sides thereof in the width direction of the thick steel plate I, and a direction perpendicular to the conveying direction of the thick steel plate I on the gate-type gantry 5b. The vehicle 5d is configured to be able to run on the track 5c, and the magnet (not shown) is wound around the vehicle 5d and suspended so as to be able to be lowered. In addition, it is preferable that the conveying device 5 is provided between the dividing shear machine and the side shearing machine and conveys the steel plate shortened by shearing with the dividing shear machine because the conveying apparatus can be miniaturized. Even if it is a long thing which is not split-shearing in the upstream of a shearing machine, it does not interfere.

  FIG. 2 is a rolling roll of the rolling mill 1 and shows a simplified grinding device 6 capable of grinding the surface of the work roll 1a supported by the backup roll 1b online without stopping the operation of the manufacturing equipment M. FIG. In FIG. 2, the slab S (thick steel plate I) is rolled while being conveyed from left to right as indicated by the arrows in FIG. 2. As shown in FIG. 2, the grinding apparatus 6 includes a grinding wheel 6a having a disk-like elastic structure, a grinding head 6b that rotatably supports the grinding wheel 6a, and the grinding head 6b back and forth in the direction of the double-headed arrow in FIG. In order to move, it comprises a cylinder 6d provided on the grinding head 6b via a frame 6c. The grinding device 6 is provided so as to be movable in the axial direction of the work roll 1a.

  And at the time of non-rolling of the work roll 1a, that is, at the idle time between the end of rolling of the preceding slab and the engagement of the succeeding slab, or when shifting from tentering to lengthening rolling, or On the contrary, when the work roll 1a, such as a turn when shifting from length rolling to width rolling, is not rolling with the work roll 1a biting the slab, the cylinder 6d is extended and rotated. Grinding is performed while moving in the axial direction of the work roll 1a while pressing the periphery of the grindstone 6a against the surface of the roll 1a. When the grinding is completed, the cylinder 6d is contracted to return the grindstone 6a to the standby position.

  The manufacturing equipment M according to the present embodiment has the above-described configuration, and in order to eliminate the width restriction that restricts the rolling order of the slab S, a grinding apparatus capable of grinding on the rolling mill 1 online. By providing 6, the rolling order of the slab S can be set more freely than before, a more appropriate slab design (slab arrangement) can be performed, and the stay of the thick steel plate I can be alleviated. However, the thick steel plate I may stay in the slab design alone. For this reason, the thick steel plate I is retracted from the shear line 4 to the outside (offline) of the shear line 4 or on the shear line 4. When the gap between the thick steel plates I becomes wide, the transport device 5 is provided that can transport the thick steel plate I retreated and transported out of the shear line 4 (offline) back to the shear line 4. It is possible to eliminate most of the stagnation. Thereby, productivity can be improved.

  In particular, many slabs with long rolling times that serve as rolling necks (for example, controlled rolling slabs) and slabs with long shearing times that serve as shear necks (thick steel plates tying many custom-made items) are not continuous. It is possible to design a slab (slab arrangement) so as to be approximately, and on the conveyance path L between the rolling mill 1 of the rolling line P and the shearing machine (4a, 4b, 4c or 4e) of the shearing line 4 It is possible to prevent the thick steel plate from staying in the wall as much as possible. Thereby, the shear waiting time of the shearing machine can be reduced as much as possible, and the productivity can be further improved.

  Furthermore, in the shearing line 4, the conveying device 5 is provided between the split shearing machine 4a and the edge-cutting shearing machine 4b that has a particularly long shearing time and easily becomes a shearing neck, thereby effectively reducing the shearing waiting time of the shearing machine. The productivity can be further improved.

  Examples of the present invention will be described below.

  Table 1 shows the steel plate No., plate width (mm), plate length (mm), plate thickness (mm), and number of sheets taken (sheets) of 20 thick steel plates I manufactured by the manufacturing equipment M of the present invention shown in FIG. It is a table | surface which shows a rolling form. Table 2 shows a conventional example in the case where the 20 thick steel plates I shown in Table 1 are manufactured in a manufacturing facility that does not have the grinding device 6 and the conveying device 5 shown in FIG. 2, and the manufacturing facility of the present invention shown in FIG. It is an example of a simulation with the example of the present invention in the case of manufacturing with M (having the grinding device 6 and the conveying device 5).

  In the example of the present invention, based on the occupation ratio of the thick steel plate I in the cooling bed 3, the rolling in the rolling mill 1 is stopped at a stage where this value is expected to be 100%, and the thick steel plate in the cooling floor 3 is used. When the occupancy rate of I reaches 80%, the thick steel plate I on the upstream side of the edge-cutting shearing machine 4b is thinned out on the refuge table 5b by the thinning device 5, and the occupancy rate of the cooling floor 3 is reduced. Thus, the thinning device 5 returns the thick steel plate I on the retracting base 5b to the upstream side of the edge-cutting shearing machine 4b.

  In the example of the present invention, the occupation ratio of the cooling bed 3 was defined as (total width dimension of the thick steel plate I / length along the conveying direction of the cooling bed 3). In the cooling bed 3, the longitudinal direction of the thick steel plate I is directed in the width direction of the cooling bed 3 (left and right direction in the drawing), and the width direction of the thick steel plate I is in the length direction of the cooling bed 3 (up and down direction in the drawing). This is because the steel sheet I is loaded in a state facing the steel plate I and conveyed in the width direction of the thick steel plate I (the length direction of the cooling floor 3).

  The thick steel plate I was thinned and returned based on the occupation ratio of the cooling bed 3 because the shear line 4 from the cooling bed 3 exit side to the split shear 4a and the cooling bed 3 entry side This is because the rolling line P from the rolling mill 1 to the rolling mill 1 has no function as a buffer and there is almost no change in the occupation ratio. In this example, rolling is started when the occupation ratio of the thick steel plate I in the cooling bed 3 is 60%. Furthermore, the normal rolling in the table is a rolling method in which the heated slab S is continuously rolled with the rolling mill 1 to the set plate thickness without waiting for the temperature during rolling and then cooled. On the other hand, controlled rolling is a rolling method in which rolling is temporarily stopped during rolling, and after waiting until the steel plate temperature reaches a predetermined temperature, rolling is started again.

  In Table 2, since the conventional example has the rolling order restriction of the slab plate width in the rolling mill, after rolling in order from the steel plates No1 to No10, the work rolls of the rolling mill are exchanged, and again from the steel plates No11 to No20. As a result, the waiting time for rolling was 570 seconds, and when it was included, a waiting time of 1270 seconds occurred. However, in the present invention example, since it became possible to grind the work roll 1a online by the grinding device 6, the slab width regulation was eliminated, so the rolling order of the slabs was changed, and the steel plates No. 1, 5, 4 is thinned by thinning device 5 on the upstream side of edge-cutting shearing machine 4b during rolling, and steel plates No. 16, 17, and 18 are thinned during rolling. Since the thinning device 5 returned to the upstream side of the edge-cutting shearing machine 4b, it was found that the cooling bed occupation ratio was maintained at 80% or less.

  And as a result of carrying out this in actual operation, the occupation ratio of the thick steel plate in the cooling floor 3 was slightly increased, but without waiting for rolling, the rolling was completed and the productivity could be improved. .

It is a block diagram which shows the structure of the manufacturing equipment M of the thick steel plate which concerns on embodiment of this invention. It is a simple lineblock diagram showing grinding device 6 which can grind the surface of work roll 1a which is a rolling roll of rolling mill 1 on-line, without stopping operation of manufacturing equipment M.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rolling machine 1a Work roll 1b Backup roll 2 Cooling device 3 Cooling bed 4 Shearing line 4a Dividing shearing machine 4b Ear cutting shearing machine 4c Vertical shearing machine 4e Finishing shearing machine 5 Conveying device (thinning device)
5a Refuge 5b Portal platform 5c Track 5d Cart 6 Grinding device 6a Grinding wheel 6b Grinding head 6c Frame 6d Cylinder I Thick steel plate L Conveyance route M Thick steel plate manufacturing equipment P Rolling line S Slab

Claims (2)

A rolling mill having a rolling mill for rolling hot slabs and a cooling facility for cooling the rolled steel sheet, and a shearing machine for cutting the sheared steel sheet into a product size, a split shearing machine, an edge cutting shearing machine, a finishing shearing machine, etc. In a thick steel plate manufacturing facility comprising a shear line having a plurality of shearing machines, the rolling mill is provided with a grinding machine for grinding a rolling roll surface of the rolling mill, and the steel sheet on the shearing line is A thick steel plate manufacturing facility comprising a transport device for retracting and transporting from a shearing line to a retreating location outside the line, and returning and transporting the steel plate retreated to a retreating location outside the line onto the shearing line. In the shearing line composed of a plurality of shearing machines such as a split shearing machine, an edge cutting shearing machine, a longitudinal shearing machine, a finishing shearing machine, etc., the conveying device is the split shearing machine and the edge cutting shearing downstream thereof. The thick steel plate manufacturing facility according to claim 1, wherein the thick steel plate provided between the machine and retracted and transported by the transport device is a thick steel plate after split shearing by a split shearing machine.

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