JP3090496B2 - Method and apparatus for joining hot rolled material and 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 continuous hot rolling plant, and more particularly, to a continuous hot rolling plant for joining hot rolled materials and performing continuous hot rolling, and a heat treatment in the continuous hot rolling plant. The present invention relates to a method and an apparatus for joining cold rolled materials.

[0002]

2. Description of the Related Art Generally, a hot rolling equipment is provided with a continuous casting machine, a heating furnace, a rough rolling equipment and a finish rolling equipment, and a hot steel strip produced by the continuous casting machine is subjected to a heating step in a heating furnace, a rough rolling. The product goes through the hot rolling process in the equipment and finish rolling equipment.
In the heating step, the hot steel sheet is treated as a slab, and thus in the hot rolling step, one slab is intermittently rolled.

In hot rolling, continuous rolling has been studied instead of intermittent rolling. Continuous rolling is possible if rolled materials before or during rolling can be joined. When continuous rolling becomes possible, very large profits such as energy saving, yield improvement and labor saving can be expected in addition to the improvement of productivity. Therefore, to date, various methods of joining rolled materials have been proposed. For example, JP-A-60-170581 and JP-A-62-234679 disclose a joining method of welding a joint surface by high-frequency induction heating.
Japanese Patent Application Laid-Open No. 8-12 / 86 describes a joining method in which an arc is generated by a direct current to weld a joining surface.
No. 7185 describes a method in which iron powder is mixed into oxygen gas as needed to heat and melt the joint surface, and at the same time, the oxide scale is blown off from the joint surface to press-bond the joint surface.

[0004]

However, none of the prior arts described above is sufficient to reliably join the rolled materials, and continuous rolling has not been put to practical use. The reason is that, as will be described later, in order to securely join the rolled material, the entire end face of the rolled material, that is, the entire joint surface is approximately 14 mm.
At least three conditions are required: heating to a sufficient temperature of at least 00 ° C., no oxide scale present on the surface of the bonding surface beyond a critical amount for bonding, and the flatness of the bonding surface shape as much as possible. However, the prior art does not satisfy these conditions.

That is, of the above-mentioned prior art,
The method described in Japanese Patent Application Laid-Open No. 2-127185 considers the above point of removing the oxide scale, but the condition is that only the oxygen gas is applied to the joint surface, and the entire joint surface is sufficient for the joint. It cannot be heated to temperature.
The joining method using high-frequency induction heating and the joining method using an arc also require a large-scale apparatus to sufficiently heat the central portion of the joining surface, and are difficult to put into practical use due to obstacles due to scale.

[0006] Further, none of the above prior arts takes any account of the above points. That is, generally, the end face of the rolled material to be joined is sheared by a drum-type shearing machine, and the sheared surface is not a straight face in both the thickness direction and the width direction and has an uneven shape. For this reason, if these end faces are heated and joined as they are, the end faces of both rolled materials cannot be joined over the entire surface, and local joints often tend to occur. In such a local junction,
During rolling, a tension is applied to the rolled material, which causes a cutting accident.

In addition, a large pressing force is required to avoid local joining, which causes large bulges at the joints and causes the rolled material to bend and join the joints. A problem occurs in rolling.

[0008] An object of the present invention is to reliably join a rolled material and to continuously roll by satisfying all conditions of heating a joint surface to an appropriate temperature, removing oxide scale, and improving flatness of a joint surface. It is an object of the present invention to provide a method and an apparatus for joining hot-rolled materials and a continuous hot-rolling equipment capable of performing the above-mentioned steps.

[0009]

According to a first concept of the present invention, a rear end of a preceding rolled material and a front end of a succeeding rolled material are connected in a continuous hot rolling equipment line. In the method for joining hot rolled materials to be joined, (a) a first step of preparing a plurality of cutting torches for forming a jet flow of a cutting gas; and (b) connecting the plurality of cutting torches to the preceding rolled material. A second step of setting a predetermined positional relationship with respect to the rear end and the front end of the succeeding rolled material; and (c) the plurality of welding toes.
A predetermined width from the end face of at least one of the rear end of the preceding rolled material and the front end of the succeeding rolled material, while spraying the cutting gas in the width direction of the rolled material, and spraying the jet stream of the cutting gas. A third step of ablating by;
(D) a fourth step of butt-joining the rear end and the front end by pressing the rear end and the front end of the succeeding rolled material to each other. .

[0010] In the present specification, "cutting" means that the surface base material of the rolled material is brought into a high-temperature molten state by the jet flow of the cutting gas, and the scale of the joining surface is blown down by the gas pressure of the jet flow, so that a new cutting is performed. This is to expose the base material in the high-temperature molten state.

In the above bonding method, preferably, before Symbol second step is at least partly at least one of the distal end of the jet, each said preceding rolled material rear and the following rolled material of the cutting gas intends row the setting so that a notch formed corresponding to the end portion blow hit.

[0012]

[0013]

[0014] In the above joining method, before Symbol second step, the preceding rolled material to form a gap between the tip of the rear end and the following rolled material, and each of the jet of the cutting gas the set as blow against both the rear end and the leading end
It may be in line Migihitsuji.

Further, not only cutting gas but also fine iron powder may be jetted from the plurality of cutting torches.

According to a second concept of the present invention, in order to achieve the above-mentioned object, a hot-rolling apparatus for joining a rear end of a preceding rolled material and a front end of a subsequent rolled material in a continuous hot rolling equipment line. A welding device including a plurality of cutting torches arranged in at least one row in the sheet width direction of the rolled material and each forming a jet flow of a cutting gas; Position setting means for independently moving the row-rolled material relative to the line direction and setting the rear end of the preceding rolled material and the front end of the subsequent rolled material in a predetermined positional relationship with respect to the cutting torch row. At least one of the plurality of welding torches ;
And a pressing means for pressing the rear end of the preceding rolled material and the front end of the succeeding rolled material to each other.

Further, in order to achieve the above object, according to a third concept of the present invention, in a continuous hot rolling facility having a continuous casting machine, a rough rolling mill group and a finishing rolling mill group, An arrangement is provided between the continuous casting machine and the group of rough rolling mills. The joining device may be arranged between the rough rolling mill group and the finishing rolling mill group.

[0018]

In the present invention, the joining method comprising the above steps (a) to (d) is based on the following examination results of the present inventors.

That is, according to the study of the present inventors, at least the following three conditions are necessary for securely joining the rolled material: the end surface of the rolled material, that is, the entire joint surface is about 1%.
Heated to a temperature at which a sufficient molten state of 400 ° C. or higher is obtained; no oxide scale is present on the surface of the joint; and the shape of the joint is as flat as possible.

By cutting at least one end face of the rear end of the preceding rolled material and the front end of the subsequent rolled material, about 1400
A bonding surface in a molten state at a temperature of not less than ° C is obtained. By this fusing, even if the rolled material end face has an uneven shape due to shearing by a drum type shearing machine, the uneven shape is shaped and an end face shape with high flatness is obtained. In addition, the oxide scale on the end face of the rolled material is also removed by this shaping, and a clean joint surface is obtained. Therefore, it becomes possible to join the end faces of the rolled material homogeneously and with high precision with a small pressing force, and high-strength joining is obtained.

Further, by arranging a plurality of cutting torches in the width direction of the rolled material and performing the cutting with the plurality of cutting torches, the time from the start to the end of the cutting can be shortened. The bonding surface can be press-bonded before the oxide scale is regenerated on the cut surface, and the bonding is further ensured.

[0022]

By performing at least a part of the plurality of fusing torches in the transverse direction of the rolled material to perform fusing, the fusing time is further reduced. In this case, when setting the rolled material end, a notch is formed at the rolled material end by fusing, and the jet flow of the cutting gas passes through the notch and the thickness of the rolled material. Therefore, since the cutting is performed using the notch as a starting point, the cutting in the sheet width direction can be easily and quickly performed .

[0024] It is preferable that the cutting is performed continuously in the width direction of the sheet. When cutting is performed intermittently, the joining is also intermittent, but if the end of the plate is joined, even if there are intermittent non-joined parts in other parts, sufficient Strength can be secured. By blowing not only cutting gas but also fine iron powder from the cutting torch, cutting ability is increased,
It is also possible to join stainless steel.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings.

First, an overall outline of a continuous hot rolling facility for carrying out the joining method of the present invention will be described with reference to FIGS.

In FIGS. 1 and 2, a continuous casting machine 51, a heating furnace 52,
A rough rolling mill group 53, a shearing machine 60, a finishing rolling mill group 54, a cooling furnace 55, a shearing machine 56, and a winding machine 57 are arranged in this order. In the continuous casting machine 51, the plate thickness is 120 to 300 mm,
A slab material having a width of 700 to 2000 mm is manufactured, and this slab material is rolled into bar materials having a thickness of 20 to 80 mm by the rough rolling mill group 53, and is rolled into a thin product having a thickness of 1 to 12 mm by the finishing mill group 54. Is done. The shearing machine 60 generally cuts the front and rear end crops of the bar material supplied to the finishing mill group 54 to improve the biting property. Further, the shearing machine 56 is for cutting the thin sheet product wound by the winder 57 to form a product coil.

In this specification, the continuous casting machine 5
The slab material manufactured in 1 and the bar material after being rolled by the rough rolling mill group 53 are collectively referred to as “rolled material”.

As shown in FIG. 1, the joining of the rolled material according to the present invention is performed by using a joining device 58 between a heating furnace 52 and a rough rolling mill 53.
After the heating step, the slab material is joined before the rough rolling step, and as shown in FIG. 2, a joining device 58 is arranged between the rough rolling machine 53 and the finish rolling machine 54 to perform the rough rolling step. rear,
There are two types: a case where the bar material is joined before the finish rolling step. In the former slab joining, joining is performed while moving the joining device 58 in accordance with the movement of the slab. In the latter bar material joining, the joining may be performed while moving the joining device 58 as in the case of the slab joining. However, since the moving speed of the rolled material is high, the moving speed of the preceding rolled material and the succeeding rolled material is reduced. It is advantageous to provide a looper device 59 to absorb the unmatch. When the looper device 59 is provided, not only can the joining speed be reduced, but also the joining can be performed with the rolled material stopped. In the latter case,
The joining device 58 is disposed between the shearing machine 60 and the finishing mill group 54, and the front and rear ends of the bar material are cut by the shearing machine 60, and then the front and rear ends are joined by the joining device 58.

Next, an embodiment of the joining apparatus of the present invention will be described with reference to FIGS.
This will be described with reference to FIG.

In FIG. 3, reference numeral 1 denotes a leading rolled material, 2 denotes a trailing rolled material, and the leading rolled material 1 and the trailing rolled material 2 are supported and conveyed on a table roller 3 and stopped at a desired position. You. Two sets of pinch rollers 4 and 5 are provided adjacent to the rear end of the preceding rolling material 1 and the front end of the following rolling material 2. The pinch rollers 4 and 5 are a rolled material 1 and a rolled material 2
Respectively, and a position setting function for fixing the relative positions of the two, and the two rolled materials 1 and 2 are relatively moved toward each other,
It has a pressing function of applying a pressing force between both end faces.

A large number of cutting torches 6 are arranged at predetermined height positions above the rolled materials 1 and 2 at predetermined intervals in the width direction of the rolled material sheet.
It is fixed by. The frame 7 is connected to a crankshaft 10 via a connecting bar 9. The crankshaft 10 is rotatably supported by a bearing 11 and is connected to a motor 12. When the motor 12 rotates, the frame 7 reciprocates in the width direction of the rolled material plate by the crankshaft 10, and accordingly, a large number of the cutting torches 6 reciprocate.

The cutting torch 6 is connected to the hose 1
Oxygen cylinder 15 and acetylene cylinder 16 are connected via 3 and 14, respectively. Oxygen 17 (see FIG. 4) and acetylene 18 (see FIG. 4) are gasified and supplied from these cylinders. Each of the cutting torches 6 has a powder supply pipe 19 of fine iron powder, and the powder supply pipe 19 is provided with a powder feeder 22 containing fine iron powder 21 (see FIG. 4) via a hose 20. The fine iron powder 21 is supplied to the cutting torch 6 by being connected to an air or nitrogen cylinder 23, gasifying air or nitrogen from the cylinder 23 and passing the gas or gas through a powder feeder 22.

FIG. 4 shows the details of the cutting torch 6 and the state of the jet flow. Oxygen 17 is injected from the central hole 6a of the cutting torch 6 as a cutting gas to form a main injection flow 24a. Further, a plurality of holes 6b are circumferentially arranged around the central hole 6a, and oxygen 17 and acetylene 18 are supplied to these holes 6b.
4b is injected around the main jet stream 24 to form one jet stream 24 as a whole. The auxiliary jet stream 24b isolates the main jet stream 24a from the surrounding atmosphere until the main jet stream 24a reaches the end of the rolled material, and maintains the function of the main jet stream 24a as a cutting gas. Also, if necessary, feed pipe 1
The fine iron powder 21 is jetted from the nozzle 19a connected to the jet 9 into the jet stream 24 to enhance the cutting ability. The base material at the abutting end of the rolled materials 1 and 2 is brought into a high-temperature molten state in a short time by the jet flow 24, and the molten base material in a portion substantially corresponding to the diameter is blown by the gas pressure of the main jet flow 24a. It is dropped, exposing a new hot molten base material. That is, a portion corresponding to the main injection flow 24a is cut by cutting. At the same time as this cutting, the oxide scale on the end surface of the rolled material is also removed.

FIG. 5 shows an outline of a drive and control system of the above-mentioned bonding apparatus. The pinch rollers 4 and 5 are connected to separate motors 26 and 27, respectively, and are driven independently. Also, the pinch rollers 4 and 5 support the rolled materials 1 and 2 only at the time of joining,
At other times, the pinch rollers 4 and 5 are kept open.
The upper roller is supported by cylinders 28 and 29 so as to be able to move up and down, and the lower roller is supported by cylinders 30 and 31 so as to be able to move up and down. The cylinders 28 to 31 are driven by controlling corresponding valves of the valve stand 32. A gap sensor 33 for detecting a gap g between the end surfaces of the rolled materials 1 and 2 is provided between the pinch rollers 4 and 5 as needed. The signal from the gap sensor 33 is sent to the controller 34. Further, the controller 34 also receives, as information for determining the operation timing of the pinch rollers 4 and 5, a signal from a sensor that detects the passage of the ends of the rolled materials 1 and 2 on the upstream side, and the like.
A command signal is sent from the controller 34 to the motors 12, 26, 27 and the valve stand 32 .

The above is the configuration of the joining apparatus in the case of joining while stopping the rolled material. In the case of joining while moving the rolled material, the entirety of the above-described joining apparatus is installed on a traveling carriage, and together with the rolled material. What is necessary is just to make it run. In addition,
In this case, in order to avoid interference between the pinch rollers 4 and 5 and the table roller 3, the table roller 3 located in the traveling range of the joining device can be moved up and down, and at the time of joining, the table roller is lowered to a position where it does not interfere. Is preferred.

Next, an embodiment of a joining method using the above-described joining apparatus will be described.

First, the principle of the joining method of this embodiment will be described with reference to FIG. Injection flow 24 of cutting gas from cutting torch 6
Is formed, the leading end of the preceding rolled material 1 and the leading end of the trailing rolled material 2 are brought close to the jet flow 24, and the leading rolled material 1 is brought into contact with the end faces of both ends substantially at the center of the diameter of the jet flow 24. And the relative position of the following rolling material 2 are fixed and held. As a result, the jet stream 24 of the cutting torch is blown from each end face to a portion having a width approximately half the diameter of the jet stream 24,
As described above, the portion of the jet stream 24 corresponding to the main jet stream 24a is melted and removed. That is, assuming that the diameter of the main injection flow 24a is D, a notch 35 having a width of approximately D / 2 is formed at each end from the end face. Next, by moving the jet flow 24 of the cutting torch in the width direction of the rolled material sheet indicated by the arrow, a portion having a width of about D / 2 from the end face starting from the notch 35 is cut, and thereafter, a temperature of about 1400 ° C. or more A bonding surface in a molten state is formed. Accordingly, even if the end surfaces of the rolled materials 1 and 2 have irregular shapes due to shearing by the drum type shearing machine in the previous process, the irregular shapes are shaped and an end surface shape with high flatness is obtained. . In addition, the oxide scale on the end face of the rolled material is also removed by this shaping, and a clean joint surface is obtained. Therefore, by pressing the rolled materials 1 and 2 to each other, the rolled materials are uniformly and highly accurately joined with a small pressing force, and a high-strength joint is obtained.

In the above description, both end faces are abutted, and the end faces are positioned so as to cross the vicinity of the center of the diameter of the jet flow 24. However, the positions may be set with respect to the jet flow 24 in other relations. For example, the position may be set so that both end surfaces cross a position close to the circumference of the diameter of the jet flow 24, or the end surfaces are not in contact with each other and a gap g is provided between them to set the position. Is also good. The pressing of the end of the rolled material may be performed after the end face is hot-cut, or may be performed while hot-cutting. In the latter case, since pressing and joining are performed while performing the cutting, there is an effect that the re-generation of scale on the cut surface is minimized, a more clean joining surface can be secured, and the joining time is further shortened.

Also, by installing a large number of the cutting torches 6 as shown in FIG. 3, the amount of movement of the cutting torch for cutting the entire length of the end face of the rolled material is shortened, and the cutting time of the entire end face is shortened. . For this reason, a decrease in the temperature of the cut surface after the cutting is reduced, and the re-generation of the oxide scale after the cutting is prevented, and the cutting of the joint surface can be performed with high precision, and the joining is further ensured.

Next, a specific procedure of the embodiment of the joining method based on the above principle will be described with reference to FIG.

First, after the rear end of the preceding rolled material 1 has passed below the cutting torch 6 in which a large number is arranged, the movement of the preceding rolling material 1 is stopped, and the cutting gas is discharged from the cutting torch 6 to jet the cutting flow. 24 are formed. Next, the cylinder 29,
31 (see FIG. 5), the preceding rolled material 1 is held by the pinch roller 5, and then the motor 27 is driven to rotate the pinch roller 5, so that the preceding rolled material 1 is moved in the reverse direction, and the trailing end is moved. It approaches the jet flow 24 of the cutting torch. And
As shown in FIG. 7A, the end face of the preceding rolled material 1
4. The driving of the motor 27 is stopped at a position substantially passing through the center of 4,
The preceding rolled material 1 is fixedly held by a pinch roller 5. Next, after the leading end of the succeeding rolled material 2 passes through the pinch roller 4, the motor 26 and the cylinders 28 and 30 (see FIG. 5) are driven to drive the trailing rolled material 2 by the pinch roller 4 after the preceding rolled material 1. The material is moved toward the end, and the leading end of the succeeding rolled material is brought into contact with the rear end of the preceding rolled material. As a result, as shown in FIG. 7B, a cut portion, that is, a notch 35 is formed on the end surfaces of the two rolled materials 1 and 2 by the jet flow 24 of the cutting torch. This notch 35 is used for the main injection flow 24 as described above.
The jet stream 24a passes through the thickness of the rolled material 1 through the notch 35, substantially corresponding to the diameter D of the rolled material 1. This notch 35
With this formation, rapid and reliable cutting by the subsequent jet flow 24 can be performed with this as a starting point.

When the end surfaces of the rolled materials 1 and 2 come into abutting contact with each other as described above, the motor 12 (see FIG. 3)
Is driven to move the frame 7 that supports a large number of the torch torches 6, and as shown in FIG. 7C, the jet flow 24 of the torch torch is moved in the plate width direction. FIG. 7 (c) shows the end surfaces of the rolled materials 1 and 2 by the movement of the jet flow 24.
The portion shown by oblique lines is hot-melted over the entire length in the width direction of the plate to form a joined surface in a molten state. Next, the motor 26 is further driven and the motor 27 is driven again to
5 applies a pressing force between both end faces. With this pressing force, the bonding surfaces in the molten state are pressed, and the ends of the rolled materials 1 and 2 are immediately bonded as shown in FIG. After holding for a predetermined time, the rotation of the motors 26 and 27 is stopped and the cylinder 2
8 to 30 are driven to open the pinch rollers 4 and 5.

When the above-mentioned joining is performed while moving the rolled materials 1 and 2, the joining device may be run in synchronization with the movement of the rolled materials 1 and 2.

According to the present embodiment, the rear end of the preceding rolled material 1 and both end surfaces of the front end of the succeeding rolled material 2 are cut by the jet stream 24 of the large number of cutting torches 6, so that the entire end surface can be cut in a short time. It is possible to obtain a clean joining surface by performing abrasion to a state suitable for joining, to achieve uniform and highly accurate joining with a small pressing force, and to obtain joining with high strength. Further, at this time, if the fine iron powder 21 is mixed into the jet flow from the cutting torch 6, the cutting ability is increased and the joining of the stainless material is also possible.

As shown in FIG. 2, when joining the bar materials rolled by the roughing mill 53, if the distance between the joining device 58 and the finishing mill group 54 is to be reduced, the joining operation is large in time. Be restricted. For this reason, the joining operation from the positioning of the preceding rolled material 1 to the release of the clamp after pressing by the pinch rollers 4 and 5 is preferably performed in a short time of preferably 20 seconds or less, more preferably 15 seconds or less. It is desired to do. According to experiments performed by the inventors of the present application, it was confirmed that the joining method according to the above-described embodiment can reduce the joining time to 20 seconds or less.

In the above embodiment, the preceding rolled material 1 was first positioned with respect to the jet stream 24, and then the succeeding rolled material 2 was positioned closer to the preceding rolled material 1. May be positioned first. Further, although the preceding rolled material 1 is returned and positioned with respect to the jet stream 24, if the cutting torch 6 is configured to be movable in the transport direction of the rolled material, the preceding rolling material 1 is fixed and the cutting torch 6 is fixed. May be moved toward the rear end of the preceding rolled material to perform positioning. Further, although the positioning is performed so that both end surfaces of the rolled materials 1 and 2 cross the center of the jet flow, the positioning may be performed such that the both end surfaces pass through positions deviated from the center of the jet flow.

After the end surfaces of the two rolled materials 1 and 2 abut, the traversing of the cutting torch is started and the jet flow is moved. When the distance between the end surfaces becomes a predetermined distance, the traversing of the cutting torch is started. It is also possible to start and narrow the gap while cutting. Further, although the pressing force is applied after the completion of the fusing, the pressing may be performed while fusing is performed, thereby minimizing the scale re-generation and further reducing the time until the completion of the joining.

Another embodiment of the joining method of the present invention will be described with reference to FIG. In the present embodiment, fusing is performed with a gap provided between the end faces.

First, the cylinders 29 and 31 (see FIG. 5) are driven to hold the preceding rolled material 1 by the pinch roller 5, and then the motor 27 is driven to rotate the pinch roller 5 so that the preceding rolled material 1 is rotated. The end moves toward the jet stream 24 of the cutting torch. Then, as shown in FIG.
The driving of the motor 27 is stopped at a position where the end face of the crossing part of the jet flow 24 crosses a part of the jet flow 24, and the preceding rolled material 1 is fixed and held by the pinch roller 5. Next, the leading end of the succeeding rolled material 2 is
After passing through the motor 26 and the cylinders 28 and 30 (FIG. 5)
) Is driven to move the succeeding rolled material 2 toward the rear end of the preceding rolled material 1 by the pinch roller 4, and the leading end of the succeeding rolled material 2 approaches the rear end of the preceding rolled material 1. The gap g between the rear end of the preceding rolled material 1 and both end surfaces of the front end of the subsequent rolled material 2 is continuously monitored by the gap sensor 33 (see FIG. 5), and the gap g is as shown in FIG. When the gap becomes a small gap, the rotation of the motor 26 is stopped, and the movement of the subsequent rolling material 2 is stopped.
Both rolled materials are fixed and held by pinch rollers 4 and 5. Here, the gap g is set to have a relation of g <D with respect to the diameter D of the main injection flow 24a.
g) The main injection flow 24a of the cutting torch is applied to a portion having a predetermined width of / 2.
Is blown. Preferably, the gap g is in the range of 0.2D to 0.8D.

Next, by rotating the motor 12 (see FIG. 3), the frame 7 supporting the plurality of the torch torches 6 is moved, and as shown in FIG. Is moved in the plate width direction along the gap g.
By the movement of the jet flow 24, the end surfaces of the rolled materials 1 and 2 are shown in FIG.
The portion shown by oblique lines in (c) is hot-melted over the entire length in the plate width direction to form a joined surface in a molten state. At this time,
After the first cutting in one direction is completed, the end face of the preceding rolled material 1 and the end face of the succeeding rolling material 2 are relatively moved in a direction approaching each other to reset the gap g between both end faces, and the cutting torch is used. By performing the ablation with the moving direction reversed and thereafter repeating the required number of times, the ablation may be performed a plurality of times, thereby further improving the accuracy of the ablated surface.

Simultaneously with the completion of the fusing, the motors 26 and 27 are rotated to rotate the pinch rollers 4 and 5 holding the rolled materials 1 and 2 respectively. As a result, the rolled materials 1 and 2 move in a direction approaching each other, and as shown in FIG. 8D, the joining surfaces in the molten state are pressed, and the ends of the two rolled materials 1 and 2 are joined. After holding for a predetermined time, the rotation of the motors 26 and 27 is stopped, and the cylinders 28 to 30 are driven to open the pinch rollers 4 and 5.

According to the present embodiment, since the rear end of the preceding rolled material 1 and both end surfaces of the front end of the succeeding rolled material 2 are melted, a clean joint surface can be obtained in a short time, and a small pressing force can be obtained. Uniform and high-precision joining can be achieved, and high-strength joining can be obtained.

Another embodiment of the joining apparatus according to the present invention will be described with reference to FIG. This embodiment shows a configuration in which rolling materials are joined while moving them.

Referring to FIG. 9, the joining apparatus of this embodiment has a large number of cutting torches 71 arranged at predetermined intervals in a direction perpendicular to the movement of the rolled material at the center thereof. 72 is moved in the lateral direction by a cylinder 73. The cutting torch 71 is also connected to a gas generator 74 composed of an oxygen cylinder and an acetylene cylinder. Cutting Torch 7
A chute 75 for receiving the cut and cut material of the rolled material is arranged at a lower part of the roll 1, and the cut and cut material is discharged from the chute 75 to the bucket 76. Further, with the cutting torch 71 interposed therebetween, the input side pinch rollers 77 and 78 and the output side pinch rollers (not shown).
Is installed, and the input side and the output side pinch rollers are rotationally driven by respective motors 79 via a driving device 80 and a driving spindle 80B having a universal joint 80A. The upper pinch roller 77 has a function of raising and lowering and pressing by a cylinder 81, and the lower pinch roller 78 has a function of the hydraulic jack 8
2 has a function of lifting and lowering and position holding.

The table roller 83 is driven to rotate by a motor 84, and the assembled structure can be moved up and down by a cylinder 85 from a rolled material transport level indicated by a two-dot chain line to a position indicated by a solid line at which the joining apparatus does not interfere during traveling. Also,
Frame structure 86 of the bonding apparatus, a pinion 88 which is rotated by the motor 87 by meshing with the rack 89, traveling rail 90 on in a state straddling the table rollers 83.

In the above embodiment, the shape of the jet flow of the cutting torch is circular in cross section. However, the shape is not limited to this, and may be an oblong shape or a slit shape elongated in the moving direction. Various modifications can be made, such as injecting two or more jets from two torches.

As the type of cutting gas, an acetylene energizing gas is used in combination with oxygen, but other gases may be used in combination, and only a small amount of the cutting effect may be used, although oxygen is less effective.

Further, if a plasma jet is used instead of oxygen, not only iron material but also various metal materials can be cut and joined.

An embodiment of a method for controlling a cutting torch according to the present invention will be described with reference to FIGS .

FIG. 10 shows three cutting torches 6a at the center.
Fixedly in the plate width direction according to the minimum plate width to handle
This is an embodiment in which two cutting torches 6b and 6c at both ends can be moved in the width direction according to the width of the plate.

In the case where the plate width is relatively wide as W1, FIG.
As shown in the figure, since the plate width W1 is known in advance, the cutting torches 6b at both ends are moved to the plate width in advance, and the outermost cutting torch 6c closes the stop valve 62 by a signal from the controller 63. Keep it. Thereby, fusing according to the plate width can be performed .

When the plate width is reduced to W2 as shown in FIG. 11, the torch 6b is moved so as to come to the end of the plate width W2. Thus, it is possible to perform the fusing according to the plate width similar to the above.

[0064] Sarah, and the melting time of scarfing torch 6 to move slightly
In the case of intermittent joining in the plate width direction , the same plate width and different plate widths will be described with reference to FIGS.

As shown in FIGS. 12 and 13, when the leading rolled material 1 and the trailing rolled material 2 have the same width W1, the central cutting torch 6a moves integrally in the plate width direction. ,
The cutting torches 6b at both ends start jetting of the cutting gas from a position entering the plate center from the plate end, and are respectively moved outward in the width direction by the actuator 64 to melt the base material. is there. This is because the start of melting of the base material is faster at the plate edge at the plate edge and at the plate center, so that the same movement control as with the cutting torch 6a at the center is performed. Things.

Further, in order to join base materials having different widths of W1 and W2, as shown in FIGS.
By setting and fusing in the same manner as in the case of the base material having the same width as described above, it is possible to perform intermittent joining.

[0067]

Since the present invention is constructed as described above, the following effects can be obtained.

(1) Since the end portions of the rolled material are machined together with the oxide scale, a high-temperature bonding surface with good surface accuracy can be obtained, and high-precision, high-strength bonding can be obtained.

(2) Since cutting is performed using a large number of cutting torches, the cutting time is shortened, the occurrence of oxidized scale after the cutting is minimized, and a joint having higher strength is obtained.

[0070]

( 3 ) Since at least a part of the plurality of torches is traversed for fusing, the time for fusing is further reduced. Further, at this time, a notch is formed at an end portion of the rolled material by fusing and traversing, so that fusing in the sheet width direction can be performed easily and quickly.

( 4 ) By using the fine iron powder together with the cutting gas, the cutting ability is further improved, and the application to a rolled stainless steel is also possible.

( 5 ) Since the rolled material can be joined in a short time,
The rolling speed of the entire hot rolling equipment can be maintained at a high speed, and a continuous hot rolling equipment with high productivity can be obtained.

( 6 ) It is possible to join from a thick rolled material to a thin rolled material, and it is possible to join at a desired portion of a hot steel sheet rolling facility. That is, both slab joining and bar material joining are possible, and wide continuous rolling can be performed, including continuous rolling of existing equipment.

( 7 ) In a continuous hot rolling facility for joining and hot rolling slab materials manufactured by continuous casting, a joining method and apparatus capable of joining slab materials in a short time can be obtained.

[Brief description of the drawings]

FIG. 1 is a view showing process divisions of a continuous hot rolling facility according to an embodiment of the present invention and installation locations of a joining apparatus.

FIG. 2 is a view similar to FIG. 1 showing another installation location of the joining apparatus.

FIG. 3 is a perspective view of a main part of the joining apparatus according to one embodiment of the present invention.

FIG. 4 is a cross-sectional view of the cutting torch.

FIG. 5 is a schematic diagram of a drive and control system of the bonding apparatus.

FIG. 6 is a diagram illustrating the principle of the joining method according to the present invention.

FIGS. 7A to 7D are views showing each step of a bonding method according to an embodiment of the present invention.

8 (a) to 8 (d) are views showing steps of a bonding method according to another embodiment of the present invention.

FIG. 9 is a front view of a joining apparatus according to another embodiment of the present invention.

FIG. 10 is a diagram showing an embodiment relating to a method for controlling a cutting torch.

FIG. 11 is a view showing another use state of the cutting torch shown in FIG. 10;

FIG. 12 is a view showing another embodiment relating to a method of controlling a cutting torch.

FIG. 13 is a view showing a fusing torch for implementing the control method shown in FIG.

FIG. 14 is a view showing still another embodiment of a method for controlling a cutting torch.

FIG. 15 is a view showing an embodiment of a fusing torch for implementing the control method shown in FIG. 14;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lead rolling material 2 Trailing rolling material 4,5 Pinch roller (Position setting means; Pressing means) 6 Cutting torch 19a Powdering machine (Fine iron powder supplying means) 35 Notch 52 Heating furnace 53 Coarse rolling machine 54 Finishing rolling machine 58 Joining equipment

Continuation of front page (72) Inventor Tadashi Nishino 3-1-1, Sachimachi, Hitachi-shi, Ibaraki Pref. Hitachi, Ltd. Hitachi Plant (56) References JP-A-61-126983 (JP, A) JP-A-62 JP-A-127185 (JP, A) JP-A-52-41127 (JP, A) JP-A-1-258802 (JP, A) JP-A-62-127186 (JP, A) JP-A-61-126984 (JP, A) JP-A-63-26204 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B21B 15/00 B23K 7/00 507 B23K 7/00 508 B23K 20/00 340

Claims (10)

(57) [Claims] 1. A hot-rolled material joining method for joining a trailing end of a preceding rolled material and a leading end of a succeeding rolled material in a continuous hot rolling equipment line, comprising: (a) forming a jet flow of a cutting gas; A first step of preparing a plurality of cutting torches; (b) a second step of setting the plurality of cutting torches in a predetermined positional relationship with respect to the rear end of the preceding rolled material and the front end of the succeeding rolled material. (C) moving the plurality of welding torches in the width direction of the rolled material.
A third step of cutting a portion having a predetermined width from an end face of at least one of a rear end of the preceding rolled material and a front end of the subsequent rolled material by blowing the jet gas of the cutting gas while traversing; (D) a fourth step of butt-joining the rear end and the front end by pressing the rear end and the front end of the succeeding rolled material to each other by pressing the rear end and the front end of the subsequent rolled material. Hot rolled material joining method. 2. The method of joining hot-rolled materials according to claim 1, wherein the third step includes performing the cutting on both the rear end of the preceding rolled material and the front end of the succeeding rolled material. Characteristic hot-rolled material joining method. 3. A method of bonding hot rolled material according to claim 1, wherein, prior Stories second step, the tip of the rear end and the following rolled material of each of the jet of the cutting gas is the leading rolled material at least partially blown hit by a joining method of a hot rolled material, characterized in row Ukoto the setting so that a notch formed corresponding to the end on at least one of. 4. A method of bonding hot rolled material according to claim 1, wherein, prior Stories second step, a gap is formed between the distal end of the preceding rolled material rear and the following rolled material, and bonding method of the hot rolled material, each jetting flow of the cutting gas and said row Ukoto the set as blow against both the rear end and front end. 5. The method of joining hot-rolled materials according to claim 1, wherein the third step includes the step of causing the plurality of cutting torches to jet fine iron powder in addition to the cutting gas. A method for joining hot rolled materials, characterized in that the method is performed. 6. A hot-rolled material joining apparatus for joining a trailing end of a preceding rolled material and a leading end of a succeeding rolled material in a continuous hot-rolling equipment line, comprising: (a) in a width direction of the rolled material; Cutting means including a plurality of cutting torches arranged in at least one row and each forming a jet flow of the cutting gas; (b) the preceding rolled material and the following rolled material are independently provided in the direction of the line. Te moved relative the preceding rolled material and position setting means for setting a predetermined positional relationship with the tip of the rear end and the following rolled material with respect to the scarfing torch sequence of; (c) of said plurality of welding torches At least partially
Moving means for traversing the plate width direction of the strip; hot rolled material, characterized in that it comprises a; (d) the preceding rolled material rear end pressing means for pressing together the leading end of the trailing rolled material and Joining equipment. 7. A hot-rolled material joining apparatus according to claim 6 , wherein said position setting means is two sets of pinch rollers.
The two sets of pinch rollers also serve as the pressing means. 8. A hot-rolled material joining apparatus according to claim 6 , wherein said cutting means has means for supplying a cutting gas and fine iron powder to said plurality of cutting torches. Hot rolled material joining equipment. 9. A continuous hot rolling equipment having a continuous casting machine, a rough rolling mill group and a finishing rolling mill group, wherein the hot-rolled material joining apparatus according to claim 6 is continuously cast. Continuous hot rolling equipment, which is arranged between a rolling mill and the group of rough rolling mills. 10. A continuous hot rolling equipment having a continuous casting machine, a group of rough rolling mills and a group of finishing rolling mills, wherein the apparatus for joining hot-rolled materials according to any one of claims 6 to 8 comprises the rough rolling. A continuous hot rolling facility, which is disposed between a mill group and the finishing mill group.