JP2001276915A - Many strand rolling equipment for wire rod and rolling method in it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rolling equipment with many strands for wire rods which is not restricted by a size of a rolled material. SOLUTION: In the rolling equipment comprising a rough rolling mill with many strands for wire rods 8 which rolls a billet 15 extracted from a walking beam heating furnace 2, a rolling mill with one strand for reduction 5 for reducing the billet 15 enough to roll by using the rolling mill with many strands 8 and a distributing device 6 for distributing billets 15 rolled by the rolling mill with one strand 5 to each strand of the rough rolling mill with many strands 5 are installed between the heating furnace 2 and the rough rolling mill 8 with many strands 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-strand rolling equipment for rods and a method of rolling in a multi-strand rolling equipment for rods.

[0002]

2. Description of the Related Art A multi-strand rolling mill for a bar or a bar for a bar or wire is disclosed in JP-A-3-294429. In this conventional rolling equipment, a material baked in a heating furnace is charged into a multi-strand bar rough rolling mill via a straightening device or the like.

[0003]

In the above-mentioned conventional rolling equipment, the size of the material to be rolled is limited to a size that can be received by a multi-strand rough rolling mill following a heating furnace. Therefore, it is difficult to process a material to be rolled having a size equal to or larger than the size that can be rolled by the multi-strand rough rolling mill. Here, for example, in the case of a 4-strand rough rolling mill, one piece is 110 mm to 125 mm in practical use (when an economical equipment configuration is considered).
The billet size up to mm is the limit size. If it is larger than this, the stands and rolls of the rolling mill become very large, which is uneconomical.

[0004] However, considering the production of billets in the pre-process, it is economical to use a larger billet (for example, a piece having a size of 140 mm to 155 mm).
And it is easy to handle. In addition, there are cases where billets having different sizes are rolled by the same rolling equipment due to the circumstances of the previous process (for example, a case where one piece receives two sizes of 115 mm and 155 mm and rolls). In the conventional rolling equipment described above, there is no point to consider such circumstances. That is, in the conventional rolling equipment, the acceptable billet size is limited to a size that can be rolled by the multi-strand rough rolling mill, and it is not possible to cope with a larger billet size or a different size billet.

[0005] In the case of a high-quality bar and wire factory, the heating furnace is of a walking beam type.
If the billet size is small, the rigidity when the temperature becomes high in the furnace becomes small, so that poor material passing due to "dripping" or the like occurs and is not practical. Therefore, the billet size is preferably as large as possible. However, if the billet size is large, there is a possibility that the billet cannot be rolled by the multi-strand rolling mill as described above. The present invention has been made in view of such a problem, and an object of the present invention is to provide a multi-strand rolling equipment for rods and a rolling method thereof that are not restricted by the size of a material to be rolled.

[0006]

To achieve the above object, the present invention employs the following technical means. That is,
The feature of the present invention is a rolling facility equipped with a multi-strand rough rolling mill for rods for rolling a material to be rolled extracted from a heating furnace, wherein the heating furnace and the multi-strand rough rolling mill, The present invention is characterized in that a surface reduction rolling mill for reducing the surface of a material to be rolled extracted from a furnace to a size that can be rolled by the multi-strand rolling mill is provided. According to this configuration, even when the size of the material to be rolled manufactured in the previous process is large, the heating furnace receives the material to be rolled as it is and heats it. And, since the surface reduction rolling mill reduces the material to be rolled extracted from the heating furnace to a size that can be rolled by the subsequent multi-strand rough rolling mill, the size of the material to be rolled accepted by the heating furnace is large. Even with a multi-strand rough rolling mill, rolling can be performed without any problem.

Accordingly, the size of the material to be rolled that can be accepted by the rolling equipment of the present invention is not restricted by the multi-strand rough rolling mill. In addition, between the surface-reducing rolling mill and the multi-strand rough rolling mill, a distribution for distributing the material to be rolled by the surface-reducing rolling mill to each strand of the multi-strand rough rolling mill is provided. Preferably, a device is provided. In order to cope with a large number of strands, for example, it is conceivable that the rolling mill itself can be shifted to each strand position and the material to be rolled is sorted out. If you have a minute device,
Since the material to be rolled can be distributed to each strand position without shifting the surface reduction rolling mill, the structure is simplified.

The distributing apparatus has a receiving table for receiving a material to be rolled by a surface-reducing rolling mill, and a plurality of strand positions corresponding to the multi-strand rough rolling mill. A dispensing table that dispenses the material to the multi-strand rough rolling mill side, and a distribution transfer device that can distribute and transfer the material to be rolled from the receiving table to each strand position of the dispensing table. preferable. In this case, first, the material to be rolled by the surface reduction rolling mill is sent to the receiving table. Next, the material to be rolled is transferred from the receiving table to the payout table by the distribution transfer device. At this time, since the distribution transfer device distributes the material to be rolled to each strand position of the payout table, the material to be rolled is inserted into the multi-strand rough rolling mill in a state of being distributed to each strand.

Preferably, the receiving table is a roller table in which V-shaped rollers are juxtaposed in the longitudinal direction of the material to be rolled. In this case, the material to be rolled is constrained by the V-shape, the straightness shape of the material to be rolled after the surface reduction is maintained, and the twist and the like are minimized. Further, it is preferable that the payout table is a roller table in which flat rollers with a brim having a brim for separating each strand position are arranged in the longitudinal direction of the material to be rolled.

[0010] Further, it is preferable that the apparatus further comprises a defective rolled material transfer device for sending the rolled material having failed rolling from the receiving table to the defective rolled material table. When a rolling error of the material to be rolled is found, the material can be sent to the defective material rolling table by the defective material transferring device without being transferred from the receiving table to the dispensing table.
Further, it is preferable that the distributing device has a heat retaining cover having a structure capable of shielding the internal atmosphere from the atmosphere. The heat retaining cover prevents the temperature of the material to be rolled from dropping.

[0011] It is preferable that a heat preservation furnace is provided in the material-conveying path between the sorting device and the multi-strand rough rolling mill. Further, it is preferable that the heat retaining furnace has a heat retaining cover having a structure capable of shutting off the internal atmosphere from the atmosphere. In this case, the heat retaining furnace prevents the temperature of the material to be rolled from dropping, particularly the temperature at the tail end of the material to be rolled. Further, the rolling method according to the present invention, in the rolling method in the multi-strand rolling equipment for rods to roll the material to be extracted extracted from the heating furnace with a multi-strand rough rolling mill, the material to be extracted extracted from the heating furnace Rolling, reducing the surface area to a size that can be rolled by a subsequent multi-strand rough rolling mill, distributing the material to be rolled to each stand position of the multi-strand rough rolling mill, and sending the material to the multi-strand rough rolling mill. And

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a rolling facility 1 according to the present invention. This rolling equipment 1 is for steel bars or wire rods, and includes a heating furnace 2, a rotating pinch roll 3, a descaling device 4, a rolling mill 5 for strand reduction, a distribution device 6, a heat retention furnace 7, and a multi-strand. (4 strands) The rough rolling mill 8 is provided in this order. The heating furnace 2 is of a walking beam type.
The billet (rolled material) heated and soaked to about 1250 ° C. is extracted one by one to the outside of the furnace by the extraction roller table (extraction means) 10. In addition, the billet size heated in the walking beam type heating furnace is considered to be practically required to be 120 mm or more (hereinafter referred to as “120 □”) in consideration of “dripping” in the furnace. . Here, billets of 120 □ to 160 □ are targeted. On the other hand, the size that can be rolled by the four-strand rough rolling mill 8 is about 105 □ to 115 □, but since it is reduced by the surface reduction rolling mill 5, regardless of the size that can be received by the rough rolling mill 8. , A relatively large billet which is preferable in a walking beam type heating furnace.

Although the rollers of the extraction roller table 10 are flat rollers, when the material to be rolled is a round steel, the rollers of the extraction roller table 10 preferably have a V-shaped conveying surface. Further, when trouble occurs in the equipment subsequent to the heating furnace 2 (at the time of stoppage), the movable beam and the fixed beam of the walking beam heating furnace 2 are held at the same height to support the internal billet. This prevents "drip" of the billet at the time of trouble. The heating furnace 2 is not limited to the walking beam type.

The billet extracted out of the furnace is sent to a rolling mill 5 for reduced area via a rotating pinch roll 3 and a descaling device 4. The area-reducing rolling mill 5 is a rough rolling mill having a plurality of stands, and more specifically, HVH (horizontal / vertical type).
Is a three-stand continuous one-strand rough rolling mill. The billet sent from the heating furnace 2 is rolled (reduced area) and formed to 105 □ to 115 □ by the area reduction rolling mill 5.
Note that the required number of stands of the continuous rolling mill 5 is determined by the billet size supplied for the convenience of the preceding process. The number of stands can be changed as needed.

[0015] The reduced surface rolling mill 5 can produce a steel slab of a uniform shape regardless of the billet size before rolling (before surface reduction). The billet rolled to 105 □ to 115 □ by the surface-reduction rolling mill 5 is conveyed to the distribution device 6. The distribution device (distribution transfer roller table) 6 has a receiving roller table 12 and a discharging roller table 13, and the billet rolled by the area-reducing rolling mill 5 is first transferred to the receiving roller table 12. Conveyed. FIG.
As shown in FIG. 2, the receiving roller table 12 includes a V-shaped roller 12a having a substantially V-shaped conveyance surface and a billet 15a.
A plurality is arranged in parallel in the longitudinal direction. Billet 1
5 is constrained by the V-shaped surface of the V-shaped roller 12a, the straightness of the billet 15 is maintained by its own weight, and twisting and the like are minimized.

As shown in FIGS. 2 and 3, the dispensing roller table 13 includes a plurality of flat rollers 13a common to each strand arranged in the longitudinal direction of the billet 15. The roller 13a is a flat roll with a brim provided with a plurality of brims 13b in the roller axial direction for dividing into a strand position corresponding to each strand position of the subsequent multi-strand rough rolling mill 8. Here, the roll 1 with a brim
3a is divided into four strand positions corresponding to the subsequent four-strand rough rolling mill 8. As shown in FIG. 2, the billet 15 is received by the receiving table 12, temporarily stopped, and then distributed to the designated strand position of the payout table 13 by the distribution transfer device 17. The distribution transfer device 17 moves the interval between the V-shaped rollers 12a and the interval between the brim rollers 13a. As shown in FIG. 3, the distribution transfer device 17 is mounted on the receiving table 12. The billet 15 is lifted and moved to the designated strand position of the payout table 13,
The billet 15 is placed at the strand position.

A defective billet (rolled material) table 19 is provided on the side of the receiving table 12, and if the billet of the receiving table 12 is defective due to a rolling mistake or the like, In order to prevent the billet 15 from being sent to the subsequent process, the billet 15 is transferred to the defective billet table 19 instead of the payout table 13. The transfer to the defective billet table 19 is performed by the defective billet transfer device 20. The transfer from the receiving table 12 to the payout table 13 or the defective billet table 19 may be performed by lifting the billet with a chain or the like. In addition, the receiving table 12,
The payout table 13 and the sorting / transferring device 17 can be covered with a heat insulating cover, and the temperature of the billet can be prevented from lowering by blocking the internal atmosphere from the atmosphere with the heat insulating cover.

The billets distributed to the respective strand positions of the discharging roller table 13 are conveyed by the discharging roller table 13 and inserted into the four-strand rough rolling mill 8 via the heat retaining furnace 7 and rolled. The four-strand rough rolling mill 8 can simultaneously roll four billets, and the billet at each strand position is stored in the payout table 13.
Are sequentially and successively inserted into the rough rolling mill 8 with a delay in the transfer time difference to the rough rolling mill 8. The four-strand rough rolling mill 8 is a horizontal rolling mill in which calipers having a multiple of 4 are provided on rolling rolls.

In the heat retention furnace 7, a transfer table is arranged as a billet transfer path for transferring billets. The table of the heat retention furnace 7 is an independently driven roller table for each strand, and rotates at a high speed until the tip of the billet of each strand is bitten by the rough rolling mill 8,
Thereafter, the rotation speed is synchronized with the speed of the rolling mill 8. Further, the heat retaining furnace 7 has a heat retaining cover and / or a combustion burner (heating means) to prevent a temperature drop on the billet tail end side during rolling, which is bitten by the four-strand rough rolling mill 8. Can be.

It should be noted that the present invention is not limited to the above embodiment, and various modifications can be made within the scope of the claims.

[0021]

According to the present invention, it is possible to obtain a rolling facility which is not restricted by the size of the material to be rolled.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a rolling facility.

FIG. 2 is a plan view of the distribution device.

FIG. 3 is a front view of the distribution device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 Rolling equipment 2 Heating furnace 5 Rolling mill for area reduction 6 Distributing device 7 Heat retaining furnace 8 Multi-strand rough rolling mill 12 Receiving table 13 Discharging table 15 Billet (rolled material) 17 Distributing transfer device 19 Bad billet ( Rolled material table 20 Bad billet (rolled material) transfer device

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Noriaki Hiraga 1 Kanazawa-cho, Kakogawa City, Hyogo Prefecture Inside the Kobe Steel Works Kakogawa Works (72) Inventor Yoshihiko Kubota 1 Kanazawacho, Kakogawa City, Hyogo Prefecture Kobe Corporation Inside the Steel Works Kakogawa Works (72) Inventor Katsuhiko Sakamoto 1 Kanazawacho, Kakogawa City, Hyogo Prefecture Inside the Kobe Steel Works Kakogawa Works F term (reference) 4E002 AB06 AC12 AC14 BC05 BD08 CA11 CB08 4K043 AA02 EA02 FA12

Claims (10)

[Claims] 1. A multi-strand rough mill for rods (8) for rolling a material (15) extracted from a heating furnace (2).
In the rolling equipment provided with, the material to be rolled (15) extracted from the heating furnace (2) between the heating furnace (2) and the multi-strand rough rolling mill (8).
A multi-strand rolling mill for rods, characterized in that a multi-strand rolling mill (5) for reducing the surface area to a size that can be rolled by the multi-strand rolling mill (8) is provided. 2. A rolled material (15) rolled by the surface-reduction rolling mill (5) is interposed between the surface-reduction rolling mill (5) and the multi-strand rough rolling mill (8). 2. The multi-strand rolling equipment for rods according to claim 1, wherein a sorting device (6) for distributing to each strand of the multi-strand rough rolling mill (8) is provided. 3. 3. The distributing device (6) includes a receiving table (12) for receiving a material to be rolled (15) rolled by a surface-reducing rolling mill (5), and a multi-strand rough rolling mill (8). ), A discharge table (13) having a plurality of strand positions corresponding to (1) and discharging the material to be rolled (15) toward the multi-strand rough rolling mill (8), and a material to be rolled (15) for receiving the material. 3. A multi-strand for rods according to claim 2, further comprising a sorting / transferring device (17) capable of sorting and transferring from the table (12) to each strand position of the payout table (13). Rolling equipment. 4. The multi-strand rolling machine according to claim 3, wherein the receiving table (12) is a roller table in which V-shaped rollers (12a) are arranged in the longitudinal direction of the material to be rolled. Facility. 5. The dispensing table (13) is a roller table in which flat rollers (13a) with a brim (13a) having a brim (13b) for dividing the strand into respective strand positions are arranged in the longitudinal direction of the material to be rolled. A feature according to claim 3 or claim 4.
The multi-strand rolling equipment for bar wires described. 6. A rolled material transfer device (20) for transferring a rolled material (15) having a rolling defect from the receiving table (12) to a defective rolled material table (19). The multi-strand rolling equipment for rods according to any one of claims 3 to 5, wherein: 7. The multi-wire system according to claim 2, wherein the distribution device (6) has a heat insulating cover capable of shutting off an internal atmosphere from the atmosphere. Strand rolling equipment. 8. A heat-retaining furnace (7) is provided in a material-conveying path between the sorting device (6) and the multi-strand rough rolling mill (8). Items 2 to 7
The multi-strand rolling equipment for rods according to any one of the above. 9. The multi-strand rolling mill for rods according to claim 8, wherein the heat retaining furnace has a heat retaining cover having a structure capable of shutting off an internal atmosphere from the atmosphere. 10. A method for rolling a material (15) extracted from a heating furnace (2) by a multi-strand rough rolling mill (8) in a multi-strand rolling mill for rods and wires, the method comprising: The extracted material to be rolled (15) is rolled and reduced to a size that can be rolled by the subsequent multi-strand rough rolling mill (8), and the material to be rolled (15) is then rolled to the multi-strand rough rolling mill (8). ), Which is distributed to each stand position and sent to the multi-strand rough rolling mill (8).