JPH07284808A - Method and equipment for joining roughed bar - Google Patents

Abstract

PURPOSE:To join tip parts of both roughed bars by a joining equipment by traveling both roughed bars together by means of a position adjusting device to adjust the butting position of the rear end part of the preceding roughed bar to the forward end part of the succeeding roughed bar. CONSTITUTION:In a joining equipment, the butting position of the rear end part of a preceding roughed bar 9 to the forward end part of a succeeding roughed bar 11 is adjusted by a position adjusting device 4, and the rear end part of the preceding roughed bar 11 is joined by a joining device 5. The position adjusting device 4 is traveled together with the roughed bars 9, 11, and adjusts the butting position of the roughed bars in the traveling condition. A flying mechanism is provided on the joining part of the joining device 5, and the rear end part of the roughed bar is joined to the forward end part of the other roughed bar by moving the respective rough bars 9, 11 by the flying mechanism. This constitution allows the relatively light position adjusting device 4 to travel with the rough bars, while the large and heavy joining device is traveled only by the short distance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joining method and joining equipment for joining rough bars which are rolled back and forth in a hot strip mill, and more particularly to running rough bars using simple equipment. The present invention relates to a method for joining a rough bar that can be joined as it is and continuously rolled, and a joining facility therefor.

[0002]

2. Description of the Related Art Rolling of a raw material slab by a conventional hot strip mill will be described with reference to FIG. As shown in FIG. 4, the conventional hot strip mill 50 has a heating furnace 51.
A rough rolling mill group 52, a cutting machine 53, and a finishing rolling mill group 54 are arranged in the subsequent stage. This hot strip mill 5
At 0, the slab material 57 heated and extracted in the heating furnace 51 is first roughly rolled by the rough rolling machine group 52, and the tip end portion of the slab material called a crop is cut by the cutting machine 53, and the finish rolling machine. After finishing rolling by the group 54, it is wound as a coil 56.

The above-mentioned slab material 57 is called a rough bar 55 during rough rolling. The slab material before rolling has a length of about 10 m and is finally stretched to about 60 m.
It will be an ancestor bar of a certain length. In the above-described conventional rolling of the rough bar 55 by the hot strip mill 50, since the rough bar 55 having a finite length of about 60 m is rolled, the rough bar 55 is accelerated and decelerated during rolling, and It is necessary to take a rest time each time the bar 55 is rolled.

As described above, in the conventional rolling method of the rough bar 55 in the hot strip mill 50, since the rolling is performed intermittently, the productivity is lowered and the temperature of the rough bar 55 to be rolled is changed, so that the production is performed. However, there is a problem in that the quality of the manufactured product deteriorates, such as the dimensional accuracy of the product decreases. In order to solve this problem, the rough bars 55 may be successively joined in front of the finish rolling mill group 54 to continuously and continuously roll the rough bars 55.

Therefore, various methods for joining the coarse bars 55 have been developed. There are mainly two types of joining methods for the rough bar 55: a mechanical joining method and a welding joining method.

As an example of the mechanical joining method, Japanese Patent Laid-Open No. 5-3
There is a sheet bar joining apparatus disclosed in Japanese Patent No. 8507. This sheet bar joining device joins a rough bar by an upset method, and includes a leading sheet bar clamp member having a pair of upper and lower clamp members capable of clamping the trailing end of the preceding sheet bar, and the leading end of the trailing sheet bar. A trailing sheet bar clamp member having a pair of upper and lower clamp members capable of clamping the leading sheet bar and a leading sheet bar clamp portion and a trailing sheet bar clamp portion by moving at least one clamp member in the line direction. The friction sliding device includes an upset device that can press the trailing end and the leading end of the trailing sheet bar against each other, and a friction sliding device that frictionally slides the trailing end of the leading sheet bar and the leading end of the trailing sheet bar. Is an eccentric shaft, and one end of which is fitted to the eccentric shaft and the other end of which is vertically attached to one of the clamp members and which is vertically movable. And a communication rod for Do frictional sliding.

Further, as an example of the welding joining method, Japanese Patent Laid-Open No.
Japanese Patent Laid-Open No. 8-112601 and a complete continuous rolling arrangement sequence by sheet bar joining, and JP-A-59-209405.
There is a continuous hot rolling line shown in the publication.

The complete continuous rolling arrangement sequence by sheet bar joining disclosed in Japanese Patent Laid-Open No. 58-112601 is a coil box, a shear,
It has a fixed welder, a storage device for seat bars, and a finishing rolling mill.

The continuous hot rolling line disclosed in Japanese Patent Laid-Open No. 59-209405 has a trailing end of a preceding sheet bar and a succeeding sheet bar between a rough rolling mill and a finishing rolling mill. A fixed welder for welding the front end of the sheet bar and a leading sheet bar are stored, and a spiral looper for delivering the stored sheet bar to the finishing rolling mill is arranged.

[0010]

According to the above-described conventional method for joining coarse bars, the rear end of the preceding coarse bar and the trailing coarse bar can be used in any of the mechanical joining method and the welding joining method. It takes a certain amount of time to adjust the abutting position with the tip of the and join them. However, since the leading rough bar and the trailing rough bar are in the traveling state, it is necessary to adjust the abutting position and join them while both rough bars are traveling. In addition, the device for adjusting and joining the abutting positions of these rough bars is
Since they are integrally provided, there is a problem that the device becomes large-scale and heavy. Further, since the device must be run while adjusting the butt position and joining, there is a problem that the running distance of the device is long.

Therefore, the present invention has been proposed in view of the above-mentioned problems of the prior art. The object of the present invention is to remove a rough bar in a running state that is rolled back and forth in a hot strip mill. SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for joining a rough bar that can be joined by using simple equipment and continuously perform rolling, and the joining equipment.

[0012]

DISCLOSURE OF THE INVENTION The present invention is to achieve the above-mentioned object, and the invention according to claim 1 is such that at the entry side of the finishing continuous rolling mill group of the hot strip mill,
A method of joining the trailing end of a coarse bar that travels in advance and the leading end of a coarse bar that travels in reverse, in which the position adjustment device that travels with both coarse bars travels in advance. The abutting position of the trailing end of the rough bar to be moved and the leading end of the trailing rough bar is adjusted, and the joining device provided separately from the position adjusting device adjusts the rough bar of the preceding traveling rough bar. It is characterized in that the rear end portion and the front end portion of the rough bar that travels backward are joined.

A second aspect of the present invention is the method for joining a coarse bar according to the first aspect, wherein the joining device is fixed on the line, and a flying mechanism is provided at the joining portion of the joining device. The mechanism is characterized in that the rear end of the coarse bar that travels in advance and the front end of the coarse bar that travels in reverse are moved and joined together.

The invention as set forth in claim 3 is the method for joining coarse bars according to claim 1, wherein the joining device is fixed on the line, and a looper is provided on the line to generate a loop in the coarse bar. It is characterized in that the rear end of the coarse bar that travels ahead and the front end of the coarse bar that travels behind are joined in a stopped state.

According to a fourth aspect of the present invention, at the entrance side of the finishing continuous rolling mill group of the hot strip mill, the trailing end portion of the coarse bar that travels in advance and the leading end portion of the rough bar that travels in the trailing direction are provided. A position for adjusting the abutting position of the trailing end of the coarse bar that travels ahead and the leading end of the coarse bar that travels backward while traveling with both coarse bars. The adjusting device and the position adjusting device are provided separately,
It is characterized in that it has a joining device for joining the rear end portion of the coarse bar that travels in advance and the leading end portion of the coarse bar that travels backward, the position of which is adjusted by the position adjusting device.

A fifth aspect of the present invention is the apparatus for joining coarse bars according to the fourth aspect, wherein the joining device is fixed on the line, and the joining part has a flying mechanism.
It is characterized in that the rear end portion of the coarse bar that travels ahead and the front end portion of the coarse bar that travels behind are joined while moving.

A sixth aspect of the present invention is the apparatus for joining coarse bars according to the fourth aspect, wherein the joining device is fixed on the line and a looper is provided on the line.

[0018]

According to the above-mentioned inventions of claims 1 and 3, a position adjusting device and a joining device are separately provided on the inlet side of the finishing continuous rolling mill group of the hot strip mill, and position adjustment is performed. By adjusting the abutting position of the rear end of the coarse bar that travels in advance by the device and the tip of the coarse bar that travels in the rear, and the rear end of the coarse bar that travels in advance by the joining device, Join the tip of the rough bar that runs behind. At this time, the position adjusting device travels with both the coarse bars to adjust the abutting positions of the coarse bars in the traveling state. Then, when the adjustment of the abutting position by the position adjusting device is completed, the joining device joins the trailing end portion of the coarse bar that travels ahead and the leading end portion of the rough bar that travels behind.

Further, in the inventions according to claims 2 and 4, the joining device is fixedly provided on the line. Further, a flying mechanism is provided at the joining portion of this joining device. Then, when joining the rear end portion of the rough bar that travels in advance by the joining device and the tip end portion of the coarse bar that travels in the trailing direction, the coarse bars are joined while being moved by the flying mechanism.

In the inventions according to claims 3 and 6, the joining device is fixedly provided on the line. Further, a looper is provided at an appropriate position on the line, for example, between the joining device and the finishing continuous rolling mill group. Then, when joining the rear end of the coarse bar that travels in advance by the joining device and the tip of the coarse bar that travels in the rear, a looper is used to generate a loop in the coarse bar, thereby Join with the bar stopped.

As described above, according to the present invention, the position adjusting device for adjusting the abutting position between the rear end of the coarse bar that travels in advance and the front end of the coarse bar that travels in the rear, and both coarse bars. A separate joining device is provided for joining the ends of the.
The relatively lightweight position adjusting device travels together with the coarse bar, and the heavy joining device reduces the travel distance or keeps it stationary.

Therefore, it becomes possible to join the rough bar with a simple equipment, and it is possible to provide a method for joining the rough bar, which continuously rolls the rough bar, and the joining equipment.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 is a schematic configuration diagram showing an embodiment of the present invention, FIG. 1 (a) is a schematic configuration diagram of the first embodiment, and FIG. 1 (b).
2A is a schematic configuration diagram of the second embodiment, FIG. 1C is a schematic configuration diagram of the third embodiment, FIG. 2 is a schematic configuration diagram of a state in which the position adjusting device and the joining device are combined, and FIG. Is a longitudinal section, Fig. 2
3B is a cross-sectional view, FIG. 3 is a schematic configuration diagram of a bonding apparatus in the second embodiment shown in FIG. 1B, FIG. 3A is a side view of a state before bonding, and FIG. Side view of joined state, Fig. 3
(C) shows the front view of a bonded state, respectively.

A first embodiment of a coarse bar joining facility according to the present invention will be described with reference to FIG. 1 (a). In this rough bar joining facility 1, a position adjusting device 4a and a joining device 5a are separately provided on the entrance side of the finishing rolling mill group 3a of the rolling line 2a.

The above-mentioned position adjusting device 4a is capable of traveling together with the traveling coarse bar, and has a rear end portion of the coarse bar that travels in advance and a leading end portion of the coarse bar that travels in a backward direction. It is a device for adjusting the abutting position by making contact with each other.

The above-mentioned joining device 5a is a device for joining the rear end portion of the coarse bar that travels in advance and the tip end portion of the coarse bar that travels in the following direction. For example, CO2 arc welding. Machines, welding machines such as laser welders, and mechanical joining machines such as upset joining machines and shear joining machines. It is preferable to use a shear joining machine because the joining process of the joining device 5a is simple and the joining time is short. The joining device 5a is configured to be able to travel along with the traveling of the both rough bars only while the both rough bars are joined.

Therefore, first, while the position adjusting device 4a travels with the coarse bar on which the position adjusting device 4a travels, the butting position is adjusted, and when the position adjustment is completed, the position adjusting device 4a is moved.
Joins with the joining device 5a and travels together, joining the rear end of the coarse bar that travels in advance and the front end of the coarse bar that travels behind. Then, when the joining is completed, the position adjusting device 4a and the joining device 4b return to the initial positions and stand by for the next joining.

As described above, since the traveling distance of the heavy weight joining device 5a is shorter than that of the light weight position adjusting device 4a, the joining equipment does not become large. For example,
The position adjustment by the position adjustment device 4a requires several seconds, so the travel distance of the position adjustment device reaches several meters. on the other hand,
When the joining device 5a is configured by a shearing device, the joining time is about 0.1 seconds. That is, the line speed is 1.
Assuming 5 m / s, the traveling distance of the joining device 5a is about 150.
mm, at most 300m even if the safety allowance is taken into account
m.

A second embodiment of the rough bar joining equipment according to the present invention will be described with reference to FIG. 1 (b). In this coarse bar joining facility 6, a position adjusting device 4b and a joining device 5b are provided as separate members on the entrance side of the finishing rolling mill group 3b on the rolling line 2b.

The position adjusting device 4b described above is the same device as that of the first embodiment shown in FIG. 1, but the joining device 5b uses a shearing joining machine, and the shearing jig of this shearing joining machine is used. It has a flying mechanism, and the joining device is fixed on the line. As will be described later in detail, this flying mechanism can join the rear end of the coarse bar that travels in advance and the front end of the coarse bar that travels in the rear while moving.

A third embodiment of the coarse bar joining equipment according to the present invention will be described with reference to FIG. 1 (c). In this coarse bar joining facility 7, a position adjusting device 4c and a joining device 5c are provided as separate members on the entrance side of the finishing rolling mill group 3c on the rolling line 2c. A looper 8 is provided between the joining device 4c and the finishing continuous rolling mill group 5c. The position of the looper 8 is not limited to the above-mentioned position, and may be provided on the front side of the position adjusting device 4c.

The position adjusting device 4c described above is the same device as that of the first embodiment shown in FIG. 1, but the joining device 5c is fixed on the line.

Then, a loop is generated in the coarse bar by the looper 8, and the coarse bar is joined by the joining device 5c using the loop elimination time. That is, the position adjusting device 4c finishes the position adjustment while traveling to the position of the joining device 5c, and the position adjusting device 4c and the joining device 5c, which have finished the position adjustment, are combined to join the two coarse bars. is there.

At this time, if a shear joining machine is used as the joining device 5c, the loop amount generated by the looper 8 is
At most 300 mm, the thickness of the coarse bar is about 40-50 m
Even if the length is m, the looper 8 can sufficiently deal with the fixed joining device 5c. That is, in the conventional joining equipment, since the position adjusting device and the joining device which are integrated perform the position adjustment and joining of the rough bar, the time required for this is required for several seconds, and the thickness of the rough bar is If it is about 40 to 50 mm, it is difficult to cope with an excessive loop amount, and in practice, the looper could not be used.

The position adjusting device 4 and the joining device 5 used in each of the above-described embodiments will be described in more detail with reference to FIG. In addition, in the embodiment shown in FIG. 2, an example in which a shear joining machine is used as the joining device 5 is shown.

The position adjusting device 4 includes a leading coarse bar restraining device 10 capable of restraining the trailing end of the leading rough bar 9 and a trailing rough bar restraining device 1 capable of restraining the leading end of a trailing rough bar 11.
2 are provided.

The preceding coarse bar restraint device 10 described above has an upper leading coarse bar restraint member 10a arranged so as to sandwich the rough bar 9.
And the lower leading coarse bar restraint member 10b.

Then, first hydraulic devices 13a and 13b for moving the upper leading coarse bar restraining member 10a and the lower leading rough bar restraining member 10b respectively in the plate thickness direction are provided above the upper leading rough bar restraining member 10a. .

Further, the trailing coarse bar restraint device 12 described above is used.
Is composed of an upper trailing coarse bar restraining member 12a and a lower trailing rough bar restraining member 12b arranged so as to sandwich the rough bar 11.

A second hydraulic device 14 for moving the upper trailing rough bar restraining member 12a in the plate thickness direction is provided below the upper trailing rough bar restraining member 12a, and the lower trailing rough bar restraining member 12a is restrained. A third hydraulic device 15 for moving the trailing rough bar restraint device 12 in the moving direction of the rough bar 11 is provided behind the member 12b.

Further, the upper leading coarse bar restraint member 10 described above is used.
a and the trailing rough bar restraint member 12b are the rough bars 9, 11
They are arranged so as to partially overlap with each other. Therefore, with the trailing coarse bar restraining device 10 restraining the rear end of the leading rough bar 9 and the trailing rough bar restraining device 12 restraining the leading end of the trailing rough bar 11, the first hydraulic device 13a,
13b and the third hydraulic device 15 are driven to drive the preceding coarse bar 9
While moving the rear end of the rear upward,
Is moved toward the leading coarse bar 9,
The trailing end of the trailing rough bar 11 can be superposed on the leading end of the trailing rough bar 11. In the above-described embodiment, the trailing rough bar restraint device 12 is movable in the moving direction of the rough bars 9 and 11, and the leading rough bar restraint device 10 is movable in the vertical direction. The bar restraint device may be fixed or movable.

In the joining device 5 described above, the frame-shaped body 16 whose front and rear surfaces are released and the leading coarse bar restraint device 12 of the position adjusting device 4 provided on the upper part of the inner surface of the frame-shaped body 16 are directed downward. It comprises a shear joining device 17 composed of a hydraulic device or the like for pressing and applying a shear joining force to both the rough bars 9 and 11.

Then, the position adjusting device 4 is provided inside the frame body 16.
Can be inserted. Further, on the rear surface of the frame body 16, flange portions 18, 18 are formed toward the inside,
The flange portions 18, 18 serve as stoppers of the position adjusting device 4 that has moved inward.

The procedure of polymerization and shear joining of the preceding coarse bar 9 and the following coarse bar 11 will be described. First, the leading coarse bar 9 is disposed between the upper trailing rough bar restraining member 12a and the trailing rough bar restraining member 12b of the trailing rough bar restraining device 12 and the upper leading rough bar restraining member of the leading rough bar restraining device 10. 10a and the lower leading rough bar restraint member 10b.

The rear end portion of the leading coarse bar 9 passes through the upper trailing coarse bar restraining member 12a of the trailing rough bar restraining device 12 and the upper leading rough bar restraining member 1 of the leading rough bar restraining device 10.
0a and the trailing rough bar restraint device 12 reaching the intermediate position between the trailing rough bar restraint members 12b, the first hydraulic device 13
A is driven to press the upper leading coarse bar restraining member 10a of the leading coarse bar restraining device 10 against the upper surface of the leading rough bar 9, and the leading rough bar restraining device 10 restrains the rear end portion of the leading rough bar 9.

Similarly, the leading end portion of the trailing coarse bar 11 is connected to the upper leading coarse bar restraining member 10a of the leading rough bar restraining device 10.
When the intermediate coarse position between the trailing rough bar restraint device 12 and the trailing rough bar restraint member 12b is reached, the second hydraulic device 14 is driven to drive the upper trailing rough bar restraint member 12 of the trailing rough bar restraint device 12.
a is pressed against the upper surface of the trailing rough bar 11 and the trailing rough bar restraint device 12 restrains the tip portion of the trailing rough bar 11.

In this state, the leading rough bar restraint device 1 restrains the leading rough bar 9 by driving the first hydraulic device 13b.
0 is moved slightly above the plate thickness of the trailing rough bar 11 and the third hydraulic device 15 is driven to set the trailing rough bar restraint device 12 restraining the trailing rough bar 11 to the rough bar 9, 11
The front end of the trailing rough bar 11 is superposed on the rear end of the leading rough bar 9 by adjusting the amount of lap by moving in the front direction of the moving direction of the. The lap amount at this time is about 3 mm.

Then, the shear joint 17 is driven to move the leading coarse bar restraining device 10 restraining the leading coarse bar 9 downward, and the rear end portion of the leading rough bar 9 and the trailing rough bar 11 are moved. Shear joining with the tip of the.

When the joining is completed, the shear joining device 17 is driven to release the shear pressure, and the first hydraulic device 13a is driven to drive the upper coarse bar restraint device 10 of the preceding coarse bar restraint device 10.
a is moved upward and the second hydraulic device 14 is driven to move the upper trailing coarse bar restraining member 12a of the trailing rough bar restraining device 12 upward to release the restraint of the rough bars 9 and 11. To do.

Joining device 5b in the second embodiment described above.
Will be described in more detail with reference to FIG. In the joining device 5b shown in FIG. 3, the shear joining device 17 is provided with a flying mechanism. In this shear joining device 17, a rotary arm 19 is rotatably attached to a frame body 16 by a rotary shaft 20, and a shear pressing tool 21 is rotated by a rotary shaft 22 at the tip of the rotary arm 19. It is movably attached. Then, the rotary arm 19 can rotate back and forth in the moving direction of the coarse bars 9 and 11 by the drive of a rotary drive device (not shown).

The shear joining device 17 described above includes the rough bar 9,
Before the shearing of 11, the rotating arm 19 is
11 is in a state of being rotated rearward in the moving direction of 11, and the shear pressing tool 21 is waiting at a standby position above the position adjusting device 4 (FIG. 3A). Then, after the position adjusting device 4 adjusts the positions of the rear end portion of the leading coarse bar 9 and the leading end portion of the trailing coarse bar 11, the leading coarse bar restraint device 10 of the position adjusting device 4 operates as a shear joining device 17. When reaching the position, the rotary arm 19 starts to rotate around the rotary shaft 20 as the center of rotation by the drive of the rotary drive device (not shown) toward the front side in the moving direction of the coarse bars 9 and 11.

Along with the rotation of the rotary arm 17, the shear pressing tool 21 of the shear joining device 17 rotates about the rotary shaft 22 as the center of rotation while rotating forward in the moving direction of the coarse bars 9 and 11. Moving. Therefore, the shear pressing tool 21
Is the upper coarse bar restraint member 1 on the upper coarse bar restraint device 10.
Upper leading coarse bar restraint member 10a while moving with 0a.
Will be pressed downward (Fig. 3 (b)).
(C)). Therefore, the coarse bar 9 constrained by the preceding coarse bar restraint device 10 is also pressed downward, and the coarse bars 9 and 11 can be shear-bonded.

[0053]

Since the present invention has the above-mentioned constitution,
The effects described below can be achieved.

According to the first and third aspects of the invention, the position adjusting device and the joining device are separately provided on the inlet side of the finishing continuous rolling mill group of the hot strip mill.
The position adjusting device adjusts the abutting position between the trailing end of the coarse bar that travels first and the leading end of the coarse bar that travels backward, and the rear end of the coarse bar that travels first by the joining device. And the leading end of the rough bar that travels behind. Also, the position adjustment device runs with both coarse bars,
The abutting position of both coarse bars in the running state is adjusted.
After that, the joining device joins the trailing end portion of the coarse bar that travels in advance and the leading end portion of the rough bar that runs behind.

Further, in the inventions according to claims 2 and 4, the joining device is fixedly provided on the line, and the joining mechanism of the joining device is provided with a flying mechanism.
By using this flying mechanism, when joining the rear end of the rough bar that travels in advance by the joining device and the leading end of the coarse bar that travels backward, both coarse bars are moved and joined together. is doing.

In the inventions according to claims 3 and 6, the joining device is fixedly provided on the line, and between the joining device and the finishing continuous rolling mill group at an appropriate position on the line, for example. There is a looper. A loop is generated in the coarse bar by the looper, and the rear end of the coarse bar that travels in advance and the front end of the coarse bar that travels in the rear are joined in a stopped state.

As described above, according to the present invention, the position adjusting device for adjusting the abutting position between the rear end of the coarse bar that travels in advance and the front end of the coarse bar that travels in the rear, and both coarse bars. A separate joining device is provided for joining the ends of the.
And while the relatively lightweight position adjusting device is run with the coarse bar, the joining device, which is large and heavy,
The vehicle is either in a short mileage or in a stationary state with no mileage.

Therefore, since it is not necessary to run the entire equipment, the equipment does not become large-scale, and it becomes possible to join the rough bars with a simple equipment, so that the rough bars can be continuously rolled. it can.

Further, in the present invention, various joining devices capable of joining both rough bars can be used, but they are heavy and
In addition, the effect can be remarkably exhibited in a bonding apparatus having a short bonding time.

[Brief description of drawings]

FIG. 1 shows an embodiment of a joining apparatus for a rough bar according to the present invention, FIG. 1 (a) is a schematic configuration diagram of a first embodiment, and FIG. 1 (b) is a schematic configuration of a second embodiment. Figure, Figure 1 (c) is the third
It is a schematic block diagram of an Example.

2A and 2B are schematic configuration diagrams of a state in which a position adjusting device and a joining device are combined, FIG. 2A is a vertical sectional view, and FIG. 2B is a horizontal sectional view.

3 (a) and 3 (b) are schematic configuration diagrams of a joining apparatus in a second embodiment shown in FIG. 1 (b), FIG. 3 (a) is a side view of a state before joining, FIG. 3 (b) is a side view of a joining state, and FIG. 3 (c) is a front view of the joined state.

FIG. 4 is an explanatory diagram of a mill arrangement of a conventional hot strip mill.

[Explanation of symbols]

 1 Coarse Bar Joining Equipment (First Example) 2 Rolling Line 3 Finishing Roller Group 4 Position Adjusting Device 5 Joining Device 6 Coarse Bar Joining Equipment (Second Example) 7 Rough Bar Joining Equipment (Third Example) ) 8 looper 9 leading rough bar 10 leading rough bar restraint device 10a upper leading rough bar restraint member 10b lower leading rough bar restraint member 11 trailing rough bar 12 trailing rough bar restraint device 12a upper trailing rough bar restraint member 12b lower rear Row coarse bar restraint member 13a, b 1st hydraulic device 14 2nd hydraulic device 15 3rd hydraulic device 16 frame-like body 17 shear joining device 18 flange part 19 rotary arm 20 rotary shaft 21 shear pressing tool 22 rotary shaft (hereinafter, conventional Example) 50 hot strip mill 51 heating furnace 52 rough rolling mill group 53 cutting machine 54 finishing rolling mill group 55 rough bar 56 coil 57 slab material

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Kazuo Watanabe 20-1 Shintomi, Futtsu-shi, Chiba Nippon Steel Co., Ltd. Technology Development Division (72) Inventor Hiroe Nakajima 20-1 Shintomi, Futtsu-shi, Chiba Shin-Nihon Steel Engineering Co., Ltd.

Claims (6)

[Claims] 1. A trailing end portion of a rough bar that runs in advance on the entry side of a finishing continuous rolling mill group of a hot strip mill,
A method of joining the leading end of a rough bar that travels backward, using a position adjusting device that travels with both rough bars, and The rear end portion of the coarse bar that travels first and the coarse bar that travels backward are adjusted by a joining device that is provided separately from the position adjusting device to adjust the abutting position of the traveling coarse bar. A method for joining rough bars, characterized in that the tip of the bar is joined. 2. The method for joining a coarse bar according to claim 1, wherein the joining device is fixed on a line, and a flying mechanism is provided at a joining portion of the joining device, and the flying mechanism precedes. A method for joining coarse bars, characterized in that the rear end of the traveling coarse bar and the tip of the rearward traveling coarse bar are joined while moving. 3. The coarse bar joining method according to claim 1, wherein the joining device is fixed on the line, and a looper is provided on the line to generate a loop on the rough bar, and the coarse bar is run in advance. A method for joining coarse bars, characterized in that the rear end of the coarse bar and the tip of the coarse bar that runs behind are joined in a stopped state. 4. A trailing end portion of a coarse bar that travels in advance at the entrance side of a finishing continuous rolling mill group of a hot strip mill.
A device for joining the leading end of a coarse bar that travels backwards, that is, the trailing end of the coarse bar that travels first while traveling with both coarse bars and the coarse bar that travels backwards. A position adjusting device that adjusts the abutting position with the tip of the bar, the position adjusting device is provided separately, and the rear end of the coarse bar that travels in advance and is adjusted by the position adjusting device; A joining device for joining a rough bar, comprising: a joining device for joining a leading end portion of a rough bar that travels afterward. 5. The coarse bar joining equipment according to claim 4, wherein the joining device is fixed on the line and has a flying mechanism at the joining part, and the joining device is provided after the rough bar that travels in advance. Rough bar joining equipment characterized by joining while moving an end part and a tip part of a rough bar which runs behind. 6. The coarse bar joining apparatus according to claim 4, wherein the joining apparatus is fixed on the line and a looper is provided on the line.