JP3328515B2 - Joining cart and joining method in continuous hot rolling equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joining bogie for butt-joining rolling materials to each other in a continuous hot rolling facility for steel or the like, and a joining method using the bogie.

[0002]

2. Description of the Related Art In hot rolling equipment for steel materials, a heated slab is rolled by a rough rolling mill into a sheet bar having an intermediate thickness.
Then, it is a continuous process of rolling to a product thickness by a finishing mill train, running the run-out table, and winding by a coiler. However, the process from rough rolling to winding is performed for each single slab, and problems such as trouble due to the threading property of the front end of each material, poor shape at the front and rear ends, and poor yield due to poor thickness accuracy etc. There were various problems.

[0003] In recent years, continuous hot rolling in which a sheet bar (hereinafter referred to as a material to be rolled) after rough rolling is butt-joined to continuously pass through a finishing mill train and divided in front of a coiler. The law has begun to be adopted, and it is expected that the above conventional problems will be solved. Butt joining of the rolled materials is performed by cutting and removing the defective shape such as the fish tail at the trailing end of the preceding rolled material and the leading end of the succeeding rolled material by a cutting machine for joining, thereby adjusting the shape of both end surfaces. Both ends are clamped by a clamp device mounted on a joining carriage running at the same speed as the material to be rolled, and the both end surfaces are butted.

[0004] At that time, the leading material to be rolled is introduced into the joining bogie at the leading end, passed over a transport roll provided on the joining bogie, and the rear end is vertically moved by the exit side clamping device of the joining bogie. Press and clamp. When clamping, the joining truck is traveling at the same speed as the material to be rolled. Then, the leading end of the next material to be rolled (subsequent material to be rolled) is introduced into the joining bogie while traveling, and is similarly clamped by the entry-side clamp device,
The front end surface is abutted on the rear end surface of the leading rolled material (preceding rolled material).

[0005]

As described above, a clamping device is mounted on the entrance side and the exit side of the joining bogie as described above. When the leading rolled material is passed, the ends of the rolled material are clamped by both clamps. The transport roll is provided close to both clamping devices so as to pass smoothly without hitting the device. In order to butt-join the clamped materials to be butt-joined, it is better that the interval between the two clamping devices is small. Therefore, one transport roll is provided immediately below the center between the two clamping devices.

[0006] When joining butted portions of materials to be rolled by laser welding, arc welding, or the like, a joining torch is provided immediately above the butted portion and a laser or an arc is applied. That is, when a joining torch is provided, a joining torch is provided at an upper portion in a central portion between the two clamp devices, and a transport roll is provided below.

For this reason, at the time of butt joining of the materials to be rolled, falling spatter and molten iron adhere to the transport roll,
During the relative movement between the material to be rolled and the joining cart after the joining is completed until the next butting, there is a problem that the adhered material causes indentation flaws in the material to be rolled. Such indentation flaws cause surface defects such as bald flaws in finish rolling, and lower the production yield.

[0008] The present invention relates to a joining bogie and a joining method using the bogie for butt-joining running rolling materials to each other in continuous hot rolling equipment such as steel.
An object of the present invention is to prevent or suppress spatter and molten iron from adhering to a transport roll at the time of joining, and to solve the problem of reduced production yield of rolled products.

[0009]

According to the present invention, a joining torch for joining a running preceding rolling material and a succeeding rolling material in a continuous hot rolling facility is provided. And a transport roll is provided below the joining torch, and the transport roll can be moved up and down and rotatable.

According to the method of the present invention, when the preceding rolling material and the following rolling material are butt-joined to each other by the joining cart of the present invention, the materials to be rolled are joined with a joining torch. The interval is a joining method in a continuous hot rolling facility characterized by lowering a transport roll installed below the joining torch and rotating it at a peripheral speed of 10 m / min or more.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An example in which the joining cart of the present invention is applied to a continuous hot rolling facility will be described with reference to FIG. A heated raw material such as a slab (not shown) is roughly rolled one by one by a rough rolling mill 21 to an intermediate plate thickness to obtain a rolled material, and a running line L indicated by a dashed line is moved from left to right. While running, a defective shape portion such as a fish tail at the front end and the rear end is cut and removed by the cutting machine 22 for joining. Then, while running the joining trolley 1 at the same speed as the material to be rolled, the rear end surface of the preceding material to be rolled and the distal end surface of the succeeding material to be rolled are butt-joined, and the finish rolling mill row 23 reaches the product thickness. Continuous rolling.

The leading material to be rolled (preceding material to be rolled) after the rough rolling is introduced into the joining cart 1 after cutting and removing a defective portion such as a fish tail at a leading end by a joining cutter 22. , Passing through the joining bogie 1 and finishing rolling mill train 23
To be introduced. Note that the leading end of the material to be rolled may be passed through the joining cart 1 without being cut by the cutting machine 22 for joining, and cut by a cutting machine (not shown) in front of the finish rolling mill train 23. With respect to the rear end of the preceding rolled material, a defective portion such as a fish tail is cut and removed by a joining cutter 22 and then introduced into the joining cart 1, and the exit clamp 8 of the joining cart 1 is removed.
And hold the pressure. At this time, the joining cart 1 is traveling toward the finishing mill train 23 at the same speed as the material to be rolled.

The next material to be rolled (subsequent material to be rolled) is a cutting machine 2 for joining a shape-defective portion such as a fish tail at the tip.
2, the leading end is introduced into the joining cart 1, and is clamped and held by the entry-side clamp 7. And butting cylinder 9
By bringing the inlet-side clamp 7 closer to the outlet-side clamp 8, the leading end surface of the succeeding rolled material is butted against the rear end surface of the preceding rolled material, and the butted portion is joined by the joining torch 3.

During this time, the joining cart 1 is caused to travel toward the finishing mill train 23 at the same speed as the two materials to be rolled.
The clamping pressure of both clamps 7 and 8 is released, and the clamp 7 and 8 are returned to the rough rolling mill 21 side. Then, the trailing end portion of the succeeding rolled material is clamped and held by the output side clamp 8. When holding the clamping pressure, the joining cart 1 is moved toward the finishing mill train 23 at the same speed as the material to be rolled. At this time, the material to be rolled held by the output side clamp 8 becomes the material to be rolled in advance.

In the same manner as described above, the leading end portion of the subsequent rolled material is cut by the joining cutter 22, introduced into the joining carriage 1, clamped and held by the entry-side clamp 7, and the leading end surface is subjected to the preceding covering. It is butt-joined to the rear end face of the rolled material. In this manner, the materials to be rolled which are successively sent are butt-joined. The material continuously rolled by the finishing mill train 23 is wound by a coiler (not shown) through a run-out table (not shown).
At this time, a cutting machine before the coiler is used to divide each slab or the like into material units to obtain product coils. When the material to be rolled and the joining trolley 1 relatively move as described above, the material to be rolled is transferred by the transport rolls 4, 5, 6 provided on the joining trolley 1.
Pass over.

As described above, the joining trolley 1 of the present invention is a trolley having the joining torch 3 for butt joining the preceding rolling material and the following rolling material during traveling. The transport roll 5 is provided below, and the transport roll 5 can be moved up and down and rotatable. 1 has the joining torch 3, the butting cylinder 9, the entrance side clamp 7, the exit side clamp 8, and the transport rolls 4, 5, and 6, which are attached to the carriage frame 2 as described above. Have been. The transport roll 5 can be moved up and down and rotatable by a mechanism (not shown) attached to the carriage frame 2.

FIG. 2 shows a specific example of the elevating mechanism and the rotating mechanism of the transport roll 5. Intermediate plates 11 and 12 are fixedly mounted on the intermediate shaft 13, the intermediate plate 11 has a roll shaft 10 of the transport roll 5, and the intermediate plate 12 has a connecting member 15.
Are rotatably penetrated. The connector 15 is connected to the cylinder 16. Intermediate shaft 13
Is a bogie body (not shown) (for example, bogie frame 2 in FIG. 1)
When the connecting member 15 is lifted by the cylinder 16, the intermediate plates 11 and 12 rotate around the intermediate shaft 13, and the transport roll 5 descends. In addition, connecting tool 1
When the roller 5 is lowered, the transport roll 5 is raised.

In the lifting mechanism shown in FIG. 2, the intermediate plates 11 and 12 may be integrated. In this example, FIG.
In the positional relationship with the adjacent member such as the exit side clamp 8 shown in
The intermediate plate is separated into 11 and 12. Further, the connection shaft 14 and the connection tool 15 may be fixedly provided or may be rotatable. When the connecting shaft 14 and the connecting tool 15 are rotatable, the intermediate plate 12 and the connecting shaft 14 may be fixed.

In FIG. 2, the roll shaft 1 of the transport roll 5
0 is connected to a motor 20 via joints 17 and 18 and a joint shaft 19. The joints 17 and 18 have a flexible rotation transmission mechanism, and the motor 20 is fixed to a bogie main body (not shown) (for example, the bogie frame 2 in FIG. 1). 20 allows the transport roll 5 to rotate.

In the joining cart of the present invention, when the materials to be rolled are butt-joined to each other, the transport roll 5 is lowered, and the material is driven to rotate apart from the material to be rolled. For this reason, even if spatter or molten iron at the time of butt joining falls on the surface of the transporting roll 5, it is possible to prevent or suppress the adhesion. If not rotated, spatter or molten iron will fall on the same surface of the transport roll, and the roll surface will become hot and fallen objects will easily adhere.However, since the rotation position changes, the roll surface will be suppressed from becoming hot, Adhesion of falling objects can be prevented or suppressed.

By cooling the transport roll 5, it is possible to more reliably prevent or suppress the attachment of falling objects. As the cooling means, a means for introducing and discharging cooling water into the inside of the transport roll 5 by a well-known mechanism, a means for cooling the transport roll 5 from the surface, or the like can be adopted. Further, in the present invention, even if a falling object adheres to the transport roll 5, it can be easily removed by a scraper or the like. Laser welding, arc welding, or the like can be adopted as the joining means in the present invention.

After the joining is completed, the transport roll 5 is raised,
While being brought into contact with the material to be rolled, the joining cart 1 is caused to travel toward the rough rolling mill 21 in a direction opposite to the traveling direction of the material to be rolled. At this time, the transport roll 5 rotates in contact with the material to be rolled. However, no falling object is attached to the transport roll 5, or even if it is attached, it is extremely small. Therefore, no indentation flaw is generated on the material to be rolled, or even if it is generated, it is extremely small, so that it is possible to prevent the production yield of the rolled product from deteriorating due to a flaw or the like.

Next, according to the method of the present invention, when the running material to be rolled and the material to be rolled are butt-joined by the joining cart 1 of the present invention, the materials to be rolled are joined with a joining torch 3.
In the joining method, the conveying roll 5 installed below the joining torch 3 is lowered while rotating at a peripheral speed of 10 m / min or more.

In order to carry out the method of the present invention, in the continuous hot rolling equipment for a steel sheet or the like, while the joining cart 1 of the present invention is run at the same speed as the material to be rolled, the rear end portion and the rear portion of the preceding material to be rolled are moved. The leading end of the rolled material is clamped and held by the outlet clamp 8 and the inlet clamp 7, respectively, and both end surfaces are abutted. Then, the butting portion is joined by the joining torch 3 while the transport roll 5 below the butting portion is lowered and rotated away from the material to be rolled.

Then, the clamping pressure between the clamps 7 and 8 is released, the transport roll 5 is raised to abut against the material to be rolled, and the joining cart 1 is moved in the rough rolling mill in the direction opposite to the running direction of the material to be rolled. The trailing end portion of the succeeding material to be rolled is clamped and held by the delivery side clamp 8. When holding this pinching pressure, the joining cart 1 is run at the same speed in the same direction as the material to be rolled.

After the joining is completed, when the transport roll 5 is brought into contact with the material to be rolled and the two are relatively moved as described above, if spatter or molten iron is adhered to the transport roll 5 during the welding, Indentation flaws occur in the material. However, when the rotating peripheral speed of the transport roll 5 lowered at the time of joining by the joining torch 3 is set to 10 m / min or more, indentation flaws are formed on the material to be rolled regardless of whether the joining means is laser welding or arc welding. It does not occur, or it is extremely small even if it occurs, and it is of such an extent that it disappears in the subsequent finish rolling. Therefore, according to the method of the present invention, it is possible to prevent the production yield of a rolled product from deteriorating due to a flaw or the like.

When using the joining bogie of the present invention and implementing the method of the present invention, after the butt joining of the materials to be rolled is completed, the joining cart 1 is moved to a rough rolling mill in a direction opposite to the running direction of the material to be rolled. When traveling toward the 21 side, the transport rolls 5 support the material to be rolled and rotate smoothly. Also, when the leading end portion of the material to be rolled passes through the joining carriage, the material is similarly rotated. At this time, the rotation peripheral speed of the transport roll 5 may be controlled by the motor 20, or an idler type in which the rotation of the transport roll 5 is separated from the motor 20 and freely rotated by friction with the material to be rolled.

[0028]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Continuous hot rolling equipment as shown in FIG.
The sheet bars (rolled materials) after the rough rolling were butt-welded to each other. The target material is low carbon steel, and the material to be rolled after rough rolling has a width of 1200 mm, a thickness of 35 mm, and a length of about 60 m.
It is. A shape-defective portion such as a fish tail at a front end and a rear end of the material to be rolled is cut by a cutting machine 22 for joining,
The leading rolling material and the succeeding rolling material were butt-joined by laser welding with the joining cart 1. The joining cart 1 is provided with a lifting mechanism and a rotating mechanism for the transport roll 5 as shown in FIG.
Further, the roll 5 was cooled by circulating water from the inside. The diameter of the transport roll 5 is 240 mm.

At the time of joining, while the joining cart 1 is running at the same speed as the material to be rolled, the trailing end of the preceding material to be rolled and the leading end of the succeeding material to be rolled are respectively clamped by the exit clamp 8 and the entry clamp 7. With the clamping pressure held, the incoming clamp 7 was brought close to the outgoing clamp 8 by the butt cylinder 9 to butt the rolled materials together. Then, the conveying roll 5 was lowered to separate it from the material to be rolled, and the butted portion was laser-welded by the joining torch 3 while being rotated by the motor 20. After joining is completed, the rotation peripheral speed of the transport roll 5 by the motor 20 is
Speed obtained by adding the return speed of the joining cart 1 to the running speed of the material to be rolled (the same speed as the other transport rolls 4 and 6 of the joining cart 1)
To be brought into contact with the material to be rolled.
Toward the rough rolling mill 21 to the rear end of the succeeding material to be rolled.

For the material to be rolled after traveling, the transport roll 5
Table 1 shows the results of observing the state of occurrence of indentation flaws on the surface supported by the above, and observing the state of occurrence of surface flaws after finish rolling, and comparing with the rotational peripheral speed of the transport roll 5 lowered during bonding. In the conventional example shown in Table 1, the transport roll 5 is not lowered and the motor is not driven and rotated, and the idler is used during both joining and transport.

As is clear from Table 1, in the conventional example, the spatter and the molten iron at the time of butt joining adhere to only the limited surface of the transport roll 5 and cannot be removed by the scraper. Deep indentation flaws frequently occurred, and the indentation flaws became dents by finish rolling, and almost the entire length of the rolled product became defective. The rotation peripheral speed of the transport roll 5 is 1
In the comparative example of less than 0 m / min , although not as much as the conventional example, an indentation flaw was generated in the material to be rolled, and after finishing rolling, the indentation flaw was partially generated by the indentation flaw.

On the other hand, in the present invention example in which the rotation peripheral speed of the transport roll 5 is 10 m / min or more, the spatter or the molten iron dropped on the transport roll 5 is scattered by the rotation of the roll 5 and partially. The fallen matter adhering to the surface was easily removed by a scraper except for an extremely fine one. In the case of a rotating peripheral speed of 10 m / min , extremely small indentation flaws of the material to be rolled were generated, but disappeared by finish rolling. In the other examples of the present invention, no indentation flaw of the material to be rolled was observed, and the surface state after finish rolling was extremely good.

[0033]

[Table 1]

[0034]

The present invention relates to a joining bogie and a joining method using the bogie for butt-joining running rolling materials to each other in a continuous hot rolling facility for steel or the like. The installed transport roll can be moved up and down and rotated. Therefore, at the time of butt joining of the two materials by laser welding or arc welding, it is possible to reliably prevent or suppress the occurrence of indentation flaws on the material to be rolled due to spatter or molten iron adhering to the surface of the transport roll. it can. Therefore, it is possible to prevent the generation of a flaw on the rolled product due to such indentation flaw, and it is possible to stably improve the production yield.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an application example of a joining cart according to the present invention.

FIG. 2 is an explanatory view of a lifting / lowering and rotating mechanism of a transport roll in the joining cart according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Joining trolley 2 ... Truck frame 3 ... Joining torch 4, 5, 6 ... Conveyance roll 7 ... Entry clamp 8 ... Exit clamp 9 ... Butt cylinder 10 ... Roll shaft 11, 12 ... Intermediate plate 13 ... Intermediate shaft 14 ... Connecting shaft 15 ... Connecting tool 16 ... Cylinder 17,18 ... Joint 19 ... Joint shaft 20 ... Motor 21 ... Rough rolling mill 22 ... Cutting machine 23 ... Finishing mill row L ... Pass line

Continuation of the front page (56) References JP-A-3-268882 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B21B 15/00 B21B 1/26

Claims (2)

(57) [Claims] 1. A bogie having a joining torch for butt-joining a preceding rolling material and a subsequent rolling material in a continuous hot rolling facility, wherein a transport roll is provided below the joining torch. A joining bogie in a continuous hot rolling facility, wherein the transporting roll is set up and down and rotatable. 2. The trolley according to claim 1, wherein when the preceding rolled material and the following rolled material are butt-joined to each other while the rolling materials are joined by a joining torch,
A joining method in a continuous hot rolling facility, wherein a transport roll installed below the joining torch is lowered and rotated at a peripheral speed of 10 m / min or more.