JPH07284809A - Rough bar joining method and rough bar joining apparatus - Google Patents

Abstract

PURPOSE:To provide a method and device for joining roughed bars capable of joining the roughed bars which are continuously rolled in a simple method and in a complete condition in the hot strip mill. CONSTITUTION:The rear end part of a preceding roughed bar 8 is restricted by a preceding roughed bar restricting device 9, the forward end part of a succeeding roughed bar 10 is restricted by a succeeding roughed bar restricting device 11, and the rear end part of the preceding roughed bar 8 restricted by the preceding roughed bar restricting device 9 is overlapped on the forward end part of the succeeding rough bar 10 restricted by the succeeding roughed bar restricting device 11 by an overlapping device. The rear end part of the preceding roughed bar 8 and the forward end part of the succeeding roughed bar 10 which are overlapped in the vertical direction by the overlapping device are pressed against each other in the plate thickness direction by a shear joining device to be shear-joined.

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 a joining apparatus for joining rough bars which are rolled back and forth in a hot strip mill, and more particularly to a method for joining rough bars by a simple method. TECHNICAL FIELD The present invention relates to a method for joining a coarse bar and a joining apparatus for the same, which can continuously perform rolling.

[0002]

2. Description of the Related Art The rolling of a raw material slab by a conventional hot strip mill will be described with reference to FIG. As shown in FIG. 5, 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 after rough rolling, and the slab material 57 before rolling is about 10 m.
It has a length of about 60 mm and is finally stretched to about 60 mm.
It becomes a coarse bar with a length of about m. In the rolling of the rough bar 55 by the above-mentioned conventional hot strip mill 50, the rough bar 55 having a finite length of about 60 m is used.
Therefore, deceleration occurs during the rolling of the finishing rolling mill group, and it is necessary to take an idle time for each rolling of the rough bars 55.

Thus, the conventional hot strip 50
In the method for rolling the rough bar 55 in the above, 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 dimensional accuracy of the product to be produced is lowered and the quality is lowered. There was a problem of doing. 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.

[0007]

However, the end surface of the coarse bar 55 after the crop cutting for actually joining is shown in FIG. 6 (a).
Instead of the rectangular shape as shown in FIG. 6, it has an irregular shape in the plate thickness direction as shown in FIG. Therefore, when joining both end faces, a scale intervenes on the end faces and the temperature of the end faces decreases, so that a clean joint face is not obtained as shown in FIG. 6B, and the joint part has sufficient strength. There is a problem that you can not get.

Therefore, it is conceivable to use a welding joining method capable of giving the joining portion sufficient strength. As an example of this welding joining method, there is a complete continuous rolling arrangement sequence by sheet bar joining disclosed in JP-A-58-112601, and a continuous hot rolling line disclosed in JP-A-59-209405. .

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

The continuous hot rolling line disclosed in JP-A-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. However, such a welding and joining method has a problem that a welding time is required and a huge amount of equipment is required.

As described above, at present, it is technically difficult to continuously and sequentially bond the rough bars, and an apparatus for completely continuous rolling by continuously bonding different rough bars has not been realized.

Therefore, the present invention has been proposed in view of the above-mentioned problems of the prior art, and an object thereof is to use a simple method for a rough bar rolled back and forth in a hot strip mill. According to the present invention, there is provided a rough bar joining method and a joining apparatus therefor capable of joining in a perfect state.

[0013]

DISCLOSURE OF THE INVENTION The present invention is to achieve the above object. According to the invention of claim 1, in a joining method of a rough bar, a finishing continuous rolling mill group of a hot strip mill is installed. On the side, the trailing end portion of the preceding rough bar and the leading end portion of the following rough bar are shear-bonded in a vertically superposed state.

A second aspect of the present invention is the method for joining coarse bars according to the first aspect, in which the leading and trailing rough bars are vertically polymerized while moving in the moving direction of the rough bar. The state is characterized in that shear bonding is performed.

According to a third aspect of the present invention, there is provided a coarse bar joining apparatus provided on the inlet side of the finishing continuous rolling mill group of the hot strip mill, which is capable of restraining the rear end portion of the preceding coarse bar. A bar restraint device, a trailing coarse bar restraint device capable of restraining the leading end portion of a trailing coarse bar, a rear end portion of the leading coarse bar restrained by the leading rough bar restraint device, and the trailing rough bar restraint device A polymerization device for vertically polymerizing the leading end portion of the trailing rough bar constrained by, and pressing the trailing end portion of the leading rough bar and the leading end portion of the trailing rough bar, which are polymerized by the polymerizing device, in the plate thickness direction. And a shear joining device for shear joining according to the present invention.

The invention as set forth in claim 4 is the apparatus for joining coarse bars as set forth in claim 3, wherein the polymerizing apparatus moves either or both of the leading coarse bar restraining device and the trailing rough bar restraining device. Thus, the device is characterized in that it is a device for vertically stacking the rear end portion of the leading rough bar and the leading end portion of the trailing rough bar.

A fifth aspect of the present invention is the coarse bar joining device according to the fourth aspect, wherein the polymerizing device also serves as a shear joining device, and the superposing device includes a leading coarse bar restraining device and a trailing rough bar restraining device. It is characterized in that both or one of them is moved in the plate thickness direction to obtain a shearing force.

A sixth aspect of the present invention is the coarse bar joining apparatus according to any one of the third aspect and the fifth aspect, which comprises a leading coarse bar restraining device, a trailing rough bar restraining device, The polymerization device and the shear joining device are installed on a moving device that can move in the moving direction of the rough bar.

[0019]

In the above-mentioned inventions of claims 1 and 3, the rough bar joining device is provided on the inlet side of the finishing continuous rolling mill group of the hot strip mill. The leading coarse bar restraining device restrains the trailing end of the preceding coarse bar, and the trailing coarse bar restraining device restrains the leading end of the trailing coarse bar. In this state, the rear end portion of the leading coarse bar restrained by the leading coarse bar restraining device and the leading end portion of the trailing rough bar restrained by the trailing rough bar restraining device are vertically polymerized by the polymerization device.

Next, by means of a shear joining device, the rear end portion of the preceding rough bar and the leading end portion of the trailing rough bar, which have been vertically polymerized by the polymerization device, are pressed in the plate thickness direction for shear joining.

Further, in the invention according to claim 4, by moving either or both of the leading coarse bar restraining device and the trailing rough bar restraining device, the rear end portion of the leading rough bar and the trailing rough bar are moved. The tip and top and bottom are overlapped.

Further, in the invention of claim 5, the polymerization device also serves as a shear joining device, and either or both of the leading coarse bar restraining device and the trailing rough bar restraining device are moved in the plate thickness direction. Has gained shear force.

According to the second and sixth aspects of the invention, the leading coarse bar restraint device, the trailing rough bar restraint device, the polymerization device, and the shear joining device can be moved in the moving direction of the rough bar. It is installed on another moving device, and the preceding rough bar and the following rough bar are shear-bonded in a vertically superposed state while moving in the moving direction of the rough bar.

According to this method, the rough bar can be joined by a simple method without being restricted by temperature and pressure. Further, even with a rough bar having an irregular end face after crop shearing, by using both end faces of the coarse bar to be joined as shearing tools, the new surface can be exposed to the material, so that the joining state can be perfect. It can be done.

Therefore, the working time can be shortened to improve the productivity, the facility cost can be reduced, and the quality of the produced product can be improved. .

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 is an explanatory view showing a mill arrangement of a hot strip mill used in the present invention, FIG. 2 is a schematic side view of a coarse bar joining apparatus according to the present invention, and FIG. 3 is a rough bar joining method according to the present invention. FIG. 4 is an explanatory view of the principle, and FIG. 4 is an explanatory view showing a process of joining the rough bars by using the rough bar joining apparatus according to the present invention.

Hot strip mill 1 used in the present invention
As shown in FIG. 1, a rough rolling mill group 3, a cutting machine 4, and a finishing rolling mill group 5 are provided in this order in a subsequent stage of the heating furnace 2, and the cutting machine 4 and the finishing rolling mill group 5 are connected to each other. A coarse bar joining device 6 is provided between them.

As shown in FIG. 2, the above-described rough bar joining device 6 is provided with a preceding rough bar 8 on a moving carriage 7 which is movable in the moving direction of the rough bar in the hot strip mill 1.
A leading coarse bar restraint device 9 capable of restraining the rear end portion and a trailing coarse bar restraint device 11 capable of restraining the leading end portion of the trailing rough bar 10 are provided.

The preceding coarse bar restraining device 9 comprises an upper leading coarse bar restraining member 9a and a lower leading rough bar restraining member 9b which are arranged so as to sandwich the rough bar 8.

At the leading ends of the upper leading coarse bar restraining member 9a and the lower leading rough bar restraining member 9b in the moving direction of the rough bar 8, both rough bar restraining members 9a and 9b are provided in front and rear of the moving direction of the rough bar. First hydraulic device 12a, 12b to be moved to
And the second hydraulic devices 13a and 13b for moving the coarse bar restraining members 9a and 9b respectively in the plate thickness direction are provided above the upper and lower coarse bar restraining members 9a and 9b. It is provided.

Further, the trailing coarse bar restraint device 11 described above is used.
Is composed of an upper trailing coarse bar restraining member 11a and a lower trailing rough bar restraining member 11b arranged so as to sandwich the rough bar 10.

A third hydraulic device 14 for moving the upper trailing rough bar restraint member 11a in the plate thickness direction is provided above the upper trailing rough bar restraint member 11a.

Further, the upper leading coarse bar restraining member 9a described above is used.
And the lower trailing rough bar restraint member 11b are the rough bars 8 and 10
They are arranged so as to partially overlap with each other. Therefore, with the leading coarse bar restraining device 9 restraining the rear end portion of the leading rough bar 8 and the trailing rough bar restraining device 11 restraining the leading end portion 10 of the trailing rough bar, the first hydraulic devices 12a, 12a, 1c.
2b and the second hydraulic device 13b to drive the preceding coarse bar 8
While moving the rear end of the rear upward,
Moving toward, the trailing end of the leading coarse bar 8 can be superposed on the leading end of the trailing rough bar 10.

The above-mentioned movable carriage 7 functions as a traveling device, and the first hydraulic devices 12a and 12b and the second hydraulic device 13 are provided.
a and 13b function as a polymerization device. In the embodiment described above, the leading coarse bar restraint device 9 is movable in the moving direction of the rough bars 9 and 10 and is movable in the vertical direction. However, the leading rough bar restraint device 9 is fixed. The trailing coarse bar restraint device 11 may be movable.

Further, a shear joining device 15 composed of a hydraulic device or the like is further provided above the second hydraulic device 13a provided above the upper leading coarse bar restraining device 9 so that the rear end portion of the leading rough bar 8 and the trailing end of the trailing rough bar 8 are trailed. A shearing force can be applied by pushing down the preceding coarse bar restraint device 9 in a state where the leading end of the coarse bar 10 is vertically stacked.

When a sufficient shearing force is obtained by the polymerization device, the first hydraulic devices 12a, 12 which are polymerization devices are used.
b and the second hydraulic device 13a, 13b, in particular, by the second hydraulic device 13a, in the state where the rear end portion of the leading rough bar 8 and the leading end portion of the trailing rough bar 10 are vertically overlapped, the leading rough bar restraint device. A shearing force can be applied by pushing 9 downward. In this case, another shear joining device 1
It is possible to allow the polymerization device to also serve as the shear joining device 15 without the need for the number 5.

The procedure of polymerization and shear joining of the preceding coarse bar 8 and the following coarse bar 10 will be described with reference to FIG. First, the leading coarse bar 8 is restrained between the upper trailing coarse bar restraining member 11a and the lower trailing rough bar restraining member 11b of the trailing rough bar restraining device 11 and the upper leading coarse bar restraining device 9 of the leading rough bar restraining device 9. It passes between the member 9a and the lower leading rough bar restraint member 9b (FIG. 4 (a)).

Then, the rear end portion of the leading coarse bar 8 passes through the upper trailing coarse bar restraining member 11a of the trailing rough bar restraining device 11 and the upper leading rough bar restraining member 9a of the leading rough bar restraining device 9.
And the trailing rough bar restraint member 1 of the trailing rough bar restraint device 11.
When the intermediate position with respect to 1b is reached, the second hydraulic device 13a
Is driven to press the upper leading coarse bar restraining member 9a of the leading coarse bar restraining device 9 against the upper surface of the leading rough bar 8 to restrain the rear end portion of the leading rough bar 8 by the leading rough bar restraining device 9 (FIG. 4). (B)).

Similarly, the leading end portion of the trailing coarse bar 10 includes an upper leading coarse bar restraining member 9a of the leading rough bar restraining device 9 and a lower trailing rough bar restraining member 11b of the trailing rough bar restraining device 11. When the intermediate position is reached, the third hydraulic device 14 is driven to drive the upper rough trailing bar restraint member 11a of the trailing rough bar restraint device 11.
Is pressed against the upper surface of the trailing rough bar 10 and the leading end of the trailing rough bar 10 is restrained by the trailing rough bar restraint device 11 (FIG. 4C).

In this state, the leading rough bar restraint device 9 that restrains the leading rough bar 8 by driving the second hydraulic device 13b.
Is slightly above the plate thickness of the trailing rough bar 10 (FIG. 4 (d)), and the first hydraulic devices 12a and 12b are driven to restrain the leading rough bar 8 from the leading rough bar restraint device. 9 is moved in the rearward direction (left side in FIG. 4) of the moving direction of the coarse bar to adjust the lap amount, and the rear end portion of the preceding coarse bar 8 is superposed on the front end portion of the trailing coarse bar 10. (Fig. 4
(E)). The lap amount at this time is about 3 mm.

Then, the shear joining device 15 is driven to move the leading coarse bar restraining device 9 restraining the leading coarse bar 8 downward to move the trailing end portion of the leading rough bar 8 and the trailing rough bar 8. 10
It is sheared and joined to the tip of the (Fig. 4 (f)).

When the joining is completed, the shear joining device 15 is driven to release the shearing pressure, and the second hydraulic device 13a is driven to move the upper leading coarse bar restraining device 9 to the upper direction. Then, the third hydraulic device 14 is driven to move the upper trailing rough bar restraint member 11a of the trailing rough bar restraint device 11 upward to release the restraint of the rough bars 8 and 10 (FIG. 4).
(A)).

When superposing and shearing the preceding coarse bar 8 and the following coarse bar 10, the moving carriage 7 is moved in synchronism with the movement of the coarse bars 8 and 10, so that the coarse bars 8 and 10 are moved. Polymerization and shear bonding can be performed without causing bending or the like in 10.

If a traveling device such as the moving carriage 7 is not provided, a looper (not shown) is provided on the rolling line,
By looping the coarse bars 8 and 10 with a looper, polymerization and shear joining of the preceding coarse bar 8 and the following coarse bar 10 can be performed in a static state.

The shear joining of the rough bars 8 and 10 described above will be described in more detail with reference to FIG. In order to shear-bond the rear end surface of the preceding rough bar 8 and the front end surface of the trailing rough bar 10, first, the end surfaces of both the rough bars 8 and 10 are vertically overlapped by a predetermined lapping amount a, for example, about 3 mm (Fig. 3 (a)).

Here, when a vertical force is applied to the end faces of both the rough bars 8 and 10 to shear them, the metal b,
c flows vertically, and metal flows b ′,
c '(FIG. 3 (b)). At this time, since new surfaces without oxide scale are exposed on both end surfaces, a strong joint surface can be easily obtained.

Further, as shown in FIG. 3 (c), even if the shape of both end surfaces is an irregular cut surface after crop cutting,
By adjusting the amount of lap of both end surfaces, a perfect joint surface can be obtained.

[0048]

Since the present invention has the above-mentioned constitution,
The effects described below can be achieved. In the above-mentioned inventions according to claims 1 and 3, the rear end portion of the preceding coarse bar is restrained by the leading coarse bar restraint device, and the tip portion of the trailing coarse bar is restrained by the trailing rough bar restraint device. Then, by the polymerization device, the rear end of the leading coarse bar restrained by the leading coarse bar restraint device and the leading end of the trailing rough bar restrained by the trailing rough bar restraint device are vertically polymerized, and by the shear joining device. The rear end portion of the preceding coarse bar and the leading end portion of the following coarse bar, which are vertically polymerized by the polymerization device, are shear-bonded by pressing in the plate thickness direction.

According to the fourth aspect of the present invention, the rear end portion of the leading coarse bar is moved by moving either or both of the leading coarse bar restraining device and the trailing rough bar restraining device in the moving direction of the rough bar. And the leading end of the trailing rough bar are vertically stacked.

Further, in the invention of claim 5, the polymerizing device also serves as a shear joining device, and either or both of the leading coarse bar restraining device and the trailing rough bar restraining device are moved in the plate thickness direction. Has gained shear force.

In the inventions according to claims 2 and 6, the leading coarse bar restraint device, the trailing rough bar restraint device, the polymerization device and the shear joining device can be moved in the moving direction of the rough bar. It is installed on another moving device, and the preceding rough bar and the following rough bar are shear-bonded as a polymerization state while moving in the moving direction of the rough bar in the hot strip mill.

As described above, by using both ends of the coarse bar to be joined as shearing tools, it is possible to expose the new surface without the interposition of scales and the like, so that the shear joining can be carried out without being restricted by temperature and pressure. The rough bar can be joined by the method. Further, even with a rough bar having an irregular end face after crop shearing, the joined state can be perfect.

Therefore, the joining of the rough bars becomes simple and the joining work time can be shortened. Also,
The coarse bar joining device does not become large-scale, and the equipment cost can be reduced. Furthermore, since the joined state is perfect, it is possible to completely prevent breakage in the finish rolling mill.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a mill arrangement of a hot strip mill used in the present invention.

FIG. 2 is a schematic side view of a coarse bar joining apparatus according to the present invention.

FIG. 3 is a diagram illustrating the principle of a method for joining coarse bars according to the present invention.

FIG. 4 is an explanatory view showing a process of joining the rough bars using the rough bar joining apparatus according to the present invention.

FIG. 5 is an explanatory diagram of a mill arrangement of a conventional hot strip mill.

FIG. 6 is an explanatory view of a mechanical joining method of the conventional rough bar joining methods.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hot strip mill 2 Heating furnace 3 Rough rolling mill group 4 Cutting machine 5 Finishing rolling mill group 6 Joining device 7 Moving carriage 8 Leading rough bar 9 Leading rough bar restraint device 9a Upper leading rough bar restraint member 9b Lower leading rough bar restraint member 10 trailing rough bar 11 trailing rough bar restraint device 11a upper trailing rough bar restraint member 11b lower trailing rough bar restraint member 12a, b first hydraulic device 13a, b second hydraulic device 14 third hydraulic device 15 shear joint Equipment (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 hot strip mill, wherein the trailing end of a preceding rough bar and the trailing end of a following rough bar are shear-bonded in a vertically superposed state at the entrance side of a finishing continuous rolling mill group. And the method of joining the coarse bar. 2. The method for joining coarse bars according to claim 1, wherein the leading rough bar and the trailing rough bar are shear-bonded in a vertically superposed state while moving in the moving direction of the rough bar. A method for joining coarse bars, characterized by. 3. A coarse bar joining device provided on the inlet side of a finishing continuous rolling mill group of a hot strip mill, comprising: a leading coarse bar restraining device capable of restraining a trailing end portion of a preceding rough bar; A trailing coarse bar restraint device capable of restraining the leading end of a rough bar to be run, a rear end portion of a preceding coarse bar restrained by the preceding rough bar restraint device, and a trailing rough bar restraint device restrained by the trailing rough bar restraint device. A polymerization device for vertically polymerizing the tip part of the bar, and a shear bonding for shearing by joining the rear end part of the preceding coarse bar and the tip part of the following coarse bar, which are polymerized by the polymerization device, in the plate thickness direction. An apparatus for joining coarse bars, comprising: 4. The coarse bar joining device according to claim 3, wherein the superposing device moves either or both of the preceding coarse bar restraining device and the following rough bar restraining device,
An apparatus for joining coarse bars, which is an apparatus for vertically stacking a rear end portion of a preceding coarse bar and a front end portion of a following coarse bar. 5. The coarse bar joining apparatus according to claim 4, wherein the polymerizing apparatus also serves as a shear joining apparatus, and either or both of the leading coarse bar restraining apparatus and the trailing rough bar restraining apparatus are provided. An apparatus for joining coarse bars, characterized by moving in the plate thickness direction to obtain shearing force. 6. The coarse bar joining device according to claim 3, wherein the leading coarse bar restraining device, the trailing rough bar restraining device, the polymerizing device, and the shear joining device. A device for joining coarse bars, characterized in that the device is installed on a moving device that can move in the moving direction of the coarse bars.