JPH05277509A - Device for joining hot rolled stock - Google Patents

Abstract

PURPOSE:To miniaturize a joining device in the device for joining hot rolled stocks by stopping transmission of strong horizontal force that is generated at the time of joining bars to the main body frame. CONSTITUTION:A square link is constituted by connecting two pairs of upper and lower links 21, 22 with an inclined angle to upper and lower brackets 3c, 3d and a 2nd die frame 24 with connecting pins 25a-25d and a 1st and 2nd die frames 23, 24 are mutually and operationally connected. By lowering the 2nd die frame 24 by a specified stroke by a cylinder 9, dies 6, 7 for pressing are moved in the oblique direction towards dies 4, 5 for clamping by the action of the links 21, 22 and, while generating relative slip between the end face of a preceding bar 1 and the end face of the following bar 2, both end faces are pressurized so as to deform them plastically and joined. The horizontal force F that is generated at the time of joining is received with the links and connecting pins and does not act to the longitudinal members of the main body frame 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling equipment for hot-rolled metal sheets, and in particular, when hot-rolled materials are rolled by a group of rough rolling mills and a group of finish rolling mills, joining of rolled materials in a short time is performed. The present invention relates to a method and an apparatus for joining hot-rolled materials, which enables continuous rolling by performing

[0002]

2. Description of the Related Art There is a strong demand for continuous finish rolling in a hot metal rolling facility to improve productivity, improve quality, and automate operations. The key technology is
It is the joining of bar materials. If the joining of the bar members is not completed in a short time, for example, when the joining machine is a traveling type, the traveling distance of the joining machine becomes long and it is difficult to realize. Further, when the joining machine is of a fixed type, the thickness of the bar material is usually as thick as 30 to 50 mm, and therefore a huge looper for accumulating the bar material is required.

Conventionally, as a method of joining bar materials, many methods such as an electric heating method, a gas heating method or a solvent method have been proposed. However, there are merits and demerits, and we have not seen the realization yet. The biggest difficulty among them is the bonding time, as described above, for the bonding of bar materials, the preparation before bonding,
It takes 20 to 30 seconds at the minimum including the removal of dripping by pressing, which is too long. One of the other problems is that the bonding conditions are delicate and the quality of the bonding depends on a slight difference in the conditions. Therefore, in order to realize continuous rolling that can be put to practical use, a technique that enables reliable joining of bar materials in a short time is absolutely necessary.

Therefore, many attempts have been proposed for mechanically joining electric or gas, which does not require a long time for joining. For example, Japanese Patent Application Laid-Open No. 51-137649 discloses a method of overlapping and pressing a part of bar materials. Further, in JP-A-51-130665 and JP-A-60-102207, a bar material is obtained by cutting a bar material obliquely in the thickness direction and rolling the cut surfaces of both bar materials so as to overlap each other. A method of joining the above is described.

[0005]

However, each of the above-mentioned conventional techniques has the following problems. First, in the conventional technique described in Japanese Patent Laid-Open No. 51-137649, since the relative slippage of both bar materials is small, the generation of a new surface to be a bonding surface is small, and the bonding of the bar materials is insufficient in the experiment.

Further, in the prior arts disclosed in Japanese Patent Laid-Open Nos. 51-130665 and 60-102207, it is difficult to cut the bar material diagonally with an ordinary guillotine shear. The larger the cutting angle, the more difficult the cutting. Therefore, if a method like a milling cutter is used, diagonal cutting is possible, but it takes too much time. Even if diagonal cutting becomes possible, if the cut surfaces of both bar materials are overlapped and rolled, the crushing and removal of the scale on this joint surface is not sufficient, so the bonding strength of the bar materials is weak and slightly bent. It is easy to come off due to tension, vibration, etc.

[0007] Therefore, the applicant of the present application, for the purpose of surely joining the bar materials in a short time and realizing the continuous rolling, has a Japanese Patent Application No. 3-96723 (filing date: April 1991).
June 26th, after which, claiming the priority right based on this application, and re-applied as Japanese Patent Application No. 4-63946; filing date: March 19, 1992), "leading in line of hot rolling equipment In the method for joining a hot rolled material for joining a rolled material and a trailing rolled material, the end surface of the trailing end portion of the preceding rolled material and the end surface of the tip portion of the trailing rolled material are pressed so as to plastically deform each other. While joining both rolled materials by causing relative slip between both end faces, "a method for joining hot rolled materials" and an apparatus for performing the joining method, "leading in the line of hot rolling equipment In a hot-rolled material joining device for joining a rolled material and a trailing rolled material, (a) independently holding a rear end portion of the preceding rolled material and a leading end portion of the trailing rolled material. First and second mold devices; and (b) the first and second mold devices.
Of at least one of the die devices of the preceding rolled material and one of the trailing edge of the trailing rolled material relative to the other in the inclined direction toward the end surface of the other rolled material end. And a drive means for operating so that the hot-rolled material joining device is provided.

In the joining method of the above-mentioned prior invention, the end surface of the trailing end portion of the preceding rolled material and the end surface of the leading end portion of the trailing rolled material are pressed so as to plastically deform each other, and a relative slip occurs between both end surfaces. By doing so, the oxide scale on the end surface of both rolled materials is peeled off to expose the metal surface of the dough, and at the same time, the exposed metal surfaces are pressed against each other, thereby reliably joining both rolled materials in a short time. it can.

Further, in the joining apparatus of the above-mentioned prior invention, the trailing end portion of the preceding rolled material and the leading end portion of the trailing rolled material are
And the second mold device independently sandwiching, and at least one of the first and second mold devices, one of the trailing end of the preceding rolled material and one of the leading end of the trailing rolled material with respect to the other. The end of the trailing rolled material and the end of the trailing rolled material are plastically deformed by moving the trailing end of the preceding rolled material relative to each other. The above-mentioned joining method can be carried out by causing relative slip between both end faces while pressing so.

The present invention is an improvement over the invention of this prior application and solves the following problems. The joining device of the invention of the prior application has a structure in which the main frame of the joining machine receives a strong horizontal force generated by the wedge effect when the bar material is held and pressed by the die device. Therefore, a main body frame structure having strong lateral rigidity is required. Further, due to the strong horizontal force, frictional resistance acts on the main body frame of the bonding machine and the sliding surface of the mold device in the direction opposite to the movement of the mold device, so that the driving force applied to the mold device should be increased. However, there is a problem that the joining device becomes large.

Further, when the amount of plastic deformation of the rolled material at the time of joining, that is, the amount of crimping is increased, it is necessary to increase the driving force applied to the die device. Therefore, the amount of crimping is the bar material plate thickness and the shape of the end face cut. It is necessary to adjust optimally according to.

Further, it is necessary to easily adjust the step difference between the leading bar material and the trailing bar material in the plate thickness direction and the amount of pressing down of the die device according to the bar material plate thickness.

Further, it is necessary that the joint portion of the bar material has a sufficient joint force that can withstand the subsequent conveyance and rolling without coming off.

Further, when using a mold surface having irregularities,
Since the joint portion of the bar material bites into the mold surface and is difficult to separate from the mold, it is necessary to lift the joint portion of the bar material to enable smooth conveyance.

Further, there is a play (play) in the supporting structure of the mold device.
If so, the amount of crimping of both bar members will be less than the set value due to the influence of the mold, and the joining strength of the bar members will be insufficient. Therefore, it is necessary to remove the support structure of the mold device.

Further, in order to further increase the bonding strength, it is necessary to further pulverize and disperse the surface oxide scale in the bonded portion of the bar material.

A first object of the present invention is to prevent the transmission of a strong horizontal force generated at the time of joining rolled materials to the apparatus main body frame and to downsize the apparatus. It is to provide hot rolling equipment.

A second object of the present invention is to provide a hot-rolled material joining apparatus capable of adjusting the amount of plastic deformation of the rolled material during joining, that is, the amount of pressure bonding.

A third object of the present invention is to easily adjust the amount of step difference between the preceding rolled material and the following rolled material in the plate thickness direction and the amount of pressing down of the die device according to the plate thickness of the rolled material. The object is to provide a hot-rolled material joining device that can be used.

A fourth object of the present invention is to provide a hot-rolled material joining apparatus which reduces the possibility that the joined portion will come off during conveyance after joining and during rolling.

A fifth object of the present invention is to provide a hot-rolled material that easily separates the joint portion of the rolled material from the die surface when using a die device having an uneven die surface. It is to provide a joining device.

A sixth object of the present invention is to provide a joining device for hot rolled material which does not cause play in the supporting structure of the die device.

A seventh object of the present invention is to provide a hot-rolled material joining apparatus capable of satisfactorily crushing and dispersing the surface oxide scale in the joined portion of the rolled material.

[0024]

In order to achieve the first object, according to the present invention, a hot rolled material for joining a preceding rolled material and a following rolled material in a line of hot rolling equipment is provided. In the joining device, (a) movable first and second mold devices that sandwich the rear end portion of the preceding rolled material and the front end portion of the following rolled material independently from each other; The first and second
For applying a driving force to at least one of the mold devices of
(C) The first and second mold devices are operatively connected to each other, and the first and second mold devices are actuated when a driving force is applied by the first actuating device. And a linking means for moving one of the two in an oblique direction toward the other, and a joining device for a hot rolled material.

In the above joining device, preferably, the link means constitutes a quadrilateral link with the first and second mold devices.

Also preferably, the joining device moves one of the first and second mold devices with respect to the other,
It further comprises a second actuating means for forming a step between the both in a direction orthogonal to the length direction of the rolled material sheet, and the link means is a fulcrum associated with the one die device when moved by the second actuating means. It is configured so that the position does not change.

In order to achieve the above second object,
In the above joining apparatus, the link means has a plurality of links and a connecting pin, and at least one position of the plurality of connecting pins can be adjusted, whereby a driving force by the first actuating means acts. It is possible to adjust the movement amount of the one die device in the length direction of the rolled material plate.

Further, in order to achieve the third object,
The joining apparatus further includes first stopper means for limiting the amount of movement of the one die apparatus in the direction orthogonal to the length direction of the rolled material plate when the driving force by the first actuating means is applied, The height of the first stopper means can be adjusted.

Further, in order to achieve the third object,
The joining apparatus further includes second stopper means for limiting the amount of movement of the one die device in the direction orthogonal to the length direction of the rolled material plate when the second actuating means moves, and the second stopper is provided. The height of the means can be adjusted.

In order to achieve the above-mentioned fourth object,
In the above joining apparatus, each of the first and second mold devices has a pair of upper and lower molds, and a lower mold of the first mold device is a rear end portion of a preceding rolled material and a trailing end member. It has a length capable of supporting a part of the front end of the rolled material, and the upper mold of the second mold device supports the front end of the trailing rolled material and a part of the rear end of the preceding rolled material. Have a length that can be.

In order to achieve the fifth object,
The joining apparatus further includes lifting means capable of raising and lowering the preceding rolled material and trailing rolled material after joining from the surfaces of the first and second mold devices.

In order to achieve the sixth object,
The joining device further comprises means for applying a force in the direction of the load acting on the link means in advance to eliminate play.

In order to achieve the seventh object,
The joining apparatus further comprises means for applying vibration to at least one of the preceding rolled material and the following rolled material when the one die device is moved in an oblique direction toward the other die device by the link means. .. Note that ultrasonic waves may be applied instead of vibration.

In order to achieve the above first object,
According to the present invention, in a continuous hot rolling facility having at least one rough rolling mill and a finishing rolling mill group, it is installed between the rough rolling mill and the finishing rolling mill group, and rolled by the rough rolling mill. A continuous hot rolling facility is provided, which is provided with the joining device having the above-described configuration for sequentially joining bar materials.

[0035]

Function: Holding the preceding rolled material and the following rolled material by the first and second mold devices, respectively, and applying a driving force in the moving direction to at least one of the first and second mold devices. As a result, the first and second mold devices are moved in an oblique direction toward the other by the action of the linking means, so that between the end face of the trailing end of the preceding rolled material and the end face of the leading end of the trailing rolled material. In addition to causing relative slip, horizontal pressing force is generated between the end faces of the rolled material, and both end faces are pressed so as to be plastically deformed.
The state is suitable for joining. That is, due to the relative slip between both end faces and the pressure accompanied by plastic deformation, the above-mentioned Japanese Patent Application No. 3-9
As described in No. 6723, the oxide scales on the end surfaces of both rolled materials are peeled off to expose the metal surface of the dough, and at the same time, the exposed metal surfaces are pressed against each other to ensure that both rolled materials are in a short time. To be joined. On the other hand, the horizontal force generated by the wedge effect when pressing the end surface of the rolled material is received by the link means and does not act on the vertical member of the main body frame.

Further, by making at least one position of the plurality of connecting pins adjustable, and adjusting the amount of movement of the die device in the length direction of the rolled material plate when the driving force by the first actuating means is applied, The amount of plastic deformation when pressing the end surface of the rolled material is adjusted, and the amount of pressure bonding is adjusted.

Further, the heights of the first and second stopper means for limiting the amount of movement of the die device in the direction orthogonal to the length direction of the rolled material plate can be adjusted, so that the preceding rolled material and the following rolled material can be rolled. The amount of step difference in the plate thickness direction of the material and the amount of depression of the die device can be easily adjusted in accordance with the plate thickness of the rolled material, and this also allows the amount of pressure bonding at the time of joining to be adjusted.

Further, by joining the lower mold of the first mold device and the upper mold of the second mold device to such a length that can also support a part of the rolled material on the side not directly sandwiched, The sagging at the joints is prevented, and the possibility of the joints coming off during transportation after joining and during rolling is reduced.

Further, by raising the lifting means and lifting the pre-rolled material and the trailing-rolled material after joining from the die surface, the rolled material biting into the die surface at the time of joining can be easily separated.

Further, the play of the link means is removed by applying a force in the direction of the load acting on the link means in advance.

Further, by moving the die device while applying vibration or ultrasonic waves to at least one of the preceding rolled material and the following rolled material, crushing and dispersion of the surface oxide scale at the joint of the rolled material is promoted, Bonding strength increases.

[0042]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show the structure of a joining machine 3 according to an embodiment of the present invention. In FIG. 1, reference numeral 1a denotes a rear end portion of a preceding bar material 1 which has been rough-rolled and finish-rolled, and 2a denotes a front end portion of a succeeding bar material 2 which has been rough-rolled and cropped. Splicing machine 3
Has a main body frame 3a as a main body of the joining machine, and in the main body frame 3a, a pair of upper and lower clamping dies 4 and 5 for holding the front and rear ends 1a and 2a of the bar members 1 and 2 and the upper and lower clamp dies. A pair of pressing dies 6 and 7 are arranged.

The joining machine 3 of this embodiment has a first mold frame 23 and a second mold frame 24 in the main body frame 3a. A lower clamp mold 5 is integrally provided on the first mold frame 23, and as shown in FIG. 2, the upper clamp mold 4 is movably connected by a plurality of hydraulic cylinders 26. Second mold frame 24
Similarly, a lower pressing die 7 is integrally provided, and as shown in FIG.
As shown in FIG. 5, the upper die 6 for pressing is connected by a plurality of hydraulic cylinders 27 so as to be able to move up and down. Body frame 3a
Upper and lower brackets 3 on the upper and lower frames of
c and 3d are provided in a protruding manner, and the mold frame 23 is supported by the plurality of hydraulic cylinders 8 so as to be able to move up and down with respect to the upper and lower brackets 3b and 3c. Mold frame 2
4 is supported by a plurality of hydraulic cylinders 9 so as to be able to move up and down. Also, two pairs of upper and lower links 21 and 2 having an inclination angle α
One end of 2 is connected to the upper and lower brackets 3c and 3d by connecting pins 25a and 25d, and the other ends of the links 21 and 22 are connected to the second mold frame 24 by connecting pins 25b and 25c.
And the upper and lower brackets 3c, 3
A quadrilateral link is constituted by d, the links 21 and 22, the connecting pins 25a to 25d, and the second mold frame 24, and the first and second mold frames 23 and 24 are operatively connected to each other. .. The lower limit of the first mold frame 23 is given by a stopper 28, and the lower limit of the second mold frame 24 is given by a stopper 29.

Clamping molds 4, 5 and pressing molds 6,
Among them, the lower clamping die 5 has a length capable of supporting a part of the rear end portion 1a of the leading bar material 1 and the leading end portion 2a of the trailing bar material 2, and the pressing upper die 6 is , The leading bar 2a of the trailing bar 2 and a portion of the trailing end 1a of the leading bar 1 can be supported, and correspondingly, the other molds 4 and 7 are the leading bar 1 respectively. The length is shortened to support the rest of the rear end portion 1a of the first bar 1 and the rest of the tip portion 2a of the trailing bar member 2.

Further, the joining machine 3 is provided with a transfer device 18. The transfer device 18 has traveling wheels 18a attached to the main body frame 3a, and the joining machine 3 has the traveling wheels 1a.
The hydraulic cylinder 20 is driven on the rail 19 by 8a to reciprocate in the path direction of the bar material. The welding machine 3 accelerates to a speed almost equal to the speed Ve of the bar material 1a by the transfer device 18 and performs the welding operation of the bar materials 1a and 2a during the running.

FIG. 4 shows the overall structure of a continuous hot rolling facility equipped with the above-mentioned joining machine 3. In FIG. 4, the continuous hot rolling equipment according to the present embodiment includes a continuous casting machine 51, a heating furnace 52,
The rough rolling mill group 53, the shearing machine 60, the joining machine 3, the finishing rolling mill group 54, the cooling furnace 55, the shearing machine 56, and the winding machine 57 are arranged in this order. Plate thickness 1 for continuous casting machine 51
A slab material having a plate width of 20 to 300 mm and a plate width of 700 to 2000 mm is manufactured.
It is rolled into a bar material having a thickness of 0 to 50 mm and rolled by a finishing rolling mill group 54 into a thin plate product having a plate thickness of 1 to 12 mm. Shears 60
Is generally for cutting the crops at the leading and trailing ends of the bar material supplied to the finishing rolling mill group 54 to improve the biting property, but in this embodiment, the shearing machine 60 and the finishing rolling mill are used. The joining machine 3 is disposed between the groups 54, and the shearing machine 60 is used to crop-cut the front and rear ends of the bar material to be joined by the joining machine 3.
Is used. Further, the shearing machine 56 cuts the thin plate product wound by the winding machine 57 into a product coil.

The welding operation by the welding machine 3 will be described with reference to FIG. First, the rear end portion 1a of the leading bar material 1 and the trailing bar material 2
The tip 2a of the shearing machine 60 is placed immediately before the joining machine 3.
(See FIG. 4). The joining machine 3 accelerates to a speed substantially equal to the speed Ve of the preceding bar material 1 by the transfer device 18, and joins the bar materials 1 and 2 during running. The bar members 1 and 2 have their end faces aligned at a predetermined position on the clamp lower die 5 of the joining machine 3. Next, the cylinders 26 and 27
Is operated to push down the clamp upper mold 4 and the pressing upper mold 6 to close the clamp. Next, the cylinder 8 is operated to push down the first mold frame 23 to give a step a in the plate thickness direction between the end surface of the preceding bar material 1 and the end surface of the following bar material 2. Next, the cylinder 9 is operated to push down the second mold frame 24 by a force Q to a distance substantially equal to the step a, thereby joining the bar members 1 and 2. Next, the cylinders 26 and 27 are operated to raise the mold 4 and the mold 6, and the clamp is opened. Next, the bar material joined by a bar material lifting device (not shown) is lifted from the upper surfaces of the molds 5 and 7 and conveyed to the rolling mill arranged downstream. Upon completion of a series of joining procedures, the joining machine 3 is immediately returned to the original position by the transfer device 18 to prepare for joining the next bar material.

In the above-mentioned joining operation, in the "joining" procedure, the second die frame 24 is pushed down by the cylinder 9 for a predetermined stroke, whereby the pressing dies 6, 7 are clamped by the action of the links 21, 22. Is moved diagonally toward the working dies 4 and 5, and the rear end portion 1a of the preceding bar material 1 is moved.
Slides between the end surfaces of the bar members 1 and 2 and the end surface of the tip 2a of the trailing bar member 2, and a horizontal pressing force is generated between the end surfaces of the bar members 1 and 2 due to the wedge effect, and both end surfaces are plastically deformed. It is pressed so as to be in a state suitable for joining. That is, as described in Japanese Patent Application No. 3-96723, the oxide scale on the end surfaces of both bar materials 1 and 2 is peeled off due to the relative slip between both end surfaces and the pressure accompanied by plastic deformation, and the metal of the cloth is removed. The surfaces are exposed, and at the same time, the exposed metal surfaces are pressure-bonded to each other, so that the bar members 1 and 2 are reliably joined in a short time.

On the other hand, the horizontal force F generated by the wedge effect is generated by the links 21, 22 and the connecting pins 25a, 25b,
It is received by 25c and 25d and does not act on the longitudinal members of the main body frame 3.

FIG. 6 shows details of the step procedure and the joining procedure. The rear end portion 1a of the bar material 1 sandwiched by the clamping dies 4 and 5 is moved to the pressing dies 6 and 7 by pushing down the first die frame 23 by the cylinder 8 for a predetermined stroke. A step a is provided in the direction of the plate thickness t of the tip end portion 2a of the bar member 2 that is sandwiched between the two. Next, the second mold frame 24
The cylinder 2 is pushed down by a predetermined stroke to move the tip end portion 2a of the bar member 2 sandwiched by the pressing dies 6 and 7 in an oblique direction toward the end face of the bar member 1 so that both end faces of the bar member 2 are moved. Are pressed against each other so that they are plastically deformed, and they are slid together and joined. Here, when the shortened length of both ends in the plate length direction at the time of pressing and joining is x, the joining line is formed at a position of approximately x / 2, and x is the amount of plastic deformation that contributes to joining, that is, the amount of crimping. The crimping amount x has an optimum value according to the plate thickness t of the bar material, and the crimping amount x needs to be increased as the bar material plate thickness increases.

FIG. 7 shows the action of the link mechanism in the above joining procedure.
Will be explained. The first mold frame 23 and the second mold frame 24 include links 21 and 22 and connecting pins 25a to.
25d forms a quadrilateral link. The position of the connecting pin (fulcrum) of this quadrilateral link is shown in FIG. 7 as A ₁ , B ₁ , C.
₁ and D ₁ , the positions of the connecting pins of the quadrilateral link when the second mold frame 24 is pushed down by the step a to obtain the crimping amount x of the bar members ₁ and ₂ are A ₁ , B ₂ and C. ₂ , indicated by D ₁ . When the quadrilateral links A ₁ , B ₁ , C ₁ , and D ₁ form a parallelogram, the step amount a is obtained by the following equation (1) and the crimping amount x is obtained by the following equation (2).

[0052]

## EQU1 ## a = r (sin θ ₂ −sin θ ₁ ) (1)

[0053]

X = r (cos θ ₁ −cos θ ₂ ) = a (cos θ ₁ −cos θ ₂ ) / (sin θ ₂ −sin θ ₁ ) ... (2) where θ ₁ : link A ₁ B ₁ after step difference And link C
Inclination angle of ₁ D ₁ θ ₂ : Inclination angle of link A ₁ B ₂ and link C ₂ D ₁ after joining is completed r: Effective length of links 21, 22 In FIG. The relationship of the quantity x is shown. As can be seen from this figure, the optimum crimping amount x for the plate thickness t of the bar material can be obtained by adjusting the step amount a.

Next, the operation based on the shape features of the clamping dies 4 and 5 and the pressing dies 6 and 7 of this embodiment will be described with reference to FIG. When the bar materials are joined and continuously rolled by the finish rolling mill, in actual operation, a backup is required to prevent separation of the joined portion until the joined bar material is caught in the rolling mill. In the present embodiment, as described above, the lengths of the clamping lower die 5 and the pressing upper die 6 are set to the rear end portion 1a of the preceding bar material 1 and a part of the tip portion 2a of the following bar material 2, respectively. , And the rear end portion 1a of the leading bar member 1 and a part of the rear end portion 1a of the leading bar member 1 are supported to form an overhang structure. As a result, during joining of the bar members 1 and 2, the molds 5 and 6 cut into both sides of the bar members 1 and 2 across the joining line H as shown in FIG. The sagging F and G on the end surface of the bar material shown in FIG. 9B can be prevented. Further, according to a test by the inventors of the present application, it was confirmed that the joining line of the bar material in the plate thickness direction is a curve like H, and therefore the joining strength is also large.

As described above, according to this embodiment, the horizontal force F generated by the wedge effect at the time of pressing is applied to the link 2
1, 22 and the connecting pins 25a to 25d are supported,
A strong force does not act on the main body frame 3a of the joining machine 3, and the miniaturization of the device can be achieved. Further, there is no mechanical sliding portion between the first and second mold frames 23 and 24 and the main body frame 3a at the time of pressing, and instead, the connecting pins 25a to 25d are used.
Since it is supported by, the mechanical loss is small and the output of the cylinder 9 can be reduced.

Further, by adjusting the amount of step a in the plate thickness direction between the leading bar member and the trailing bar member, the optimum crimping amount x for the plate thickness t of the bar member can be obtained.

Further, since the lower mold 5 for clamping and the upper mold 6 for pressing have the overhang structure, the sagging of the joint portion can be prevented, and the joining line of the bar material in the plate thickness direction becomes a curve, thereby joining the bar materials. The parts may have sufficient bonding strength to withstand during subsequent transport and rolling.

Another embodiment of the present invention will be described with reference to FIGS. In the figure, the same members as those in the embodiment shown in FIG. 1 are designated by the same reference numerals.

In FIGS. 10 and 11, the first mold frame 23 and the second mold frame 24 have links 21, 22 and connecting pins 25a-25 as in the first embodiment.
The d forms a quadrilateral link. However, in this embodiment, the lower bracket 25 to which the connecting pin 25d is attached
d is configured as a part of a movable frame 40 that can move up and down, and the movable frame 40 is moved up and down by a motor 41 and a worm speed reducer 42 to adjust the position of the connecting pin 25d.

Further, as shown in FIGS. 12 to 14, a bar material lifting member 44 is incorporated on the upper surfaces of the lower molds 5 and 7 so as to be lifted and lowered by a plurality of hydraulic cylinders 43. The bar material lifting member 44 is provided with a plurality of guide rolls 45 to facilitate the transportation of the bar material. The bar material lifting member 44 is sunk from the upper surfaces of the lower molds 5 and 7 during the joining of the bar materials and is on standby. When the upper molds 4 and 6 are lifted after the bonding is completed, the bar material lifting member 44 is immediately lifted. Then, the bar members 1 and 2 are lifted from the upper surfaces of the lower molds 5 and 7. This bar material lifting device 44 is effective, especially when using a mold having an uneven mold surface, because the joint portion of the bar material bites into the mold surface and becomes difficult to separate from the mold.

As shown in FIG. 14, the first mold frame 23 and the second mold frame 24 are connected to a plurality of hydraulic cylinders 46 by pins 47 and 48. The hydraulic cylinder 46 applies a residual pressure in the direction of the load acting on the links 21 and 22, and absorbs the play of the link mechanism formed by the links 21 and 22 and the connecting pins 25a to 25d.

The operation of the link mechanism of this embodiment will be described with reference to FIGS.
7 will be described. In FIG. 15, a quadrilateral link constituted by the connecting pins 25a to 25d when the connecting pin 25d is displaced upward by y from the reference position D ₁ is A ₁ ,
B _1, C _1, indicated by D _2, A ₁ a quadrilateral link in obtaining the crimp amount x ₃ of bar member 2 from this state the first mold frame 23 pushes down only step amount a, B ₂ ,
It is shown by C ₂ and D ₂ . The pressure-bonding amount x _{3 at} this time is geometrically determined by the following equation (3).

[0063]

X ₁ = r (cos θ ₁ −cos θ ₂ ) x ₂ = r (cos θ ₃ −cos θ ₄ ) x ₃ = (x1 + x2) / 2 = (r / 2) {(cos θ ₁ −cos θ ₂ ) + ( cos θ ₃ −cos θ ₄ )} (3) where θ ₃ : inclination angle of the link C ₁ D ₂ after the step is added θ ₄ : inclination angle of the link C ₂ D ₂ after completion of joining x ₁ : of the dimension a Displacement from fulcrum B ₁ to B ₂ after pushing down x ₂ : Displacement from fulcrum C ₁ to C ₂ after pushing down dimension a x ₃ : Joining point E ₁ to E ₂ after pushing down dimension a displacement (junction E ₁ is the central point of the length L ₁ of the segment B ₁ C ₁₎ related vertical position y and the crimping amount x of the connecting pin 25d (fulcrum D ₁₎ in FIG. 16 and FIG. 17 Indicates. As can be seen from these figures, the optimum crimping amount x when the step amount a of the bar material is constant can be obtained by adjusting the vertical position y of the connecting pin 25d (fulcrum D ₁ ). That is, the fulcrum D ₁ is raised from the reference position and the link 22 (line segment C ₁ D
_When the tilt angle in ₁ ) is increased, the crimping amount x increases,
On the contrary, when the fulcrum D ₁ is lowered and the inclination angle of the link 22 is reduced, the crimping amount x becomes small.

As described above, according to the present embodiment, by adjusting the position of the connecting pin 25d, the amount of crimping can be optimally adjusted according to the bar material plate thickness and the shape of the end face cut.

Further, even if the mold surface having the concavities and convexities is used and the joint portion of the bar material bites into the mold surface and is difficult to be separated from the mold, the joint portion of the bar material can be lifted for smooth conveyance.

Further, there is a play (play) in the support structure of the mold device.
Even if there is any, it is possible to absorb the backlash, prevent the reduction of the pressure bonding amount of the bar material, and secure the bonding strength of the bar material.

In the above embodiments, the crimping amount is adjusted by moving the connecting pin 25d in the vertical direction, but the crimping amount is adjusted by moving the connecting pin 25d in the horizontal and diagonal directions. It goes without saying that you can do it. Also, by using an eccentric pin as the connecting pin, the same effect can be obtained with a simple mechanism. Further, although it has a slightly complicated structure, the crimping amount can be adjusted even if the positions of the other connecting pins 25a to 25c can be similarly adjusted.
Also. Although the parallelogram link has been described as a typical example, the lengths of the link 21 and the link 22 are changed, and the distance between the connecting pins 25a and 25d with respect to the first mold frame 23 is set to the second mold frame 24. The crimping amount can also be changed by adopting a structure in which the distance between the pins 25b and 25c is changed.

Another embodiment of the present invention is shown in FIGS.
This will be explained using Section 9. In FIG. 18, the first mold frame 23 is supported by a hydraulic cylinder 8 so as to be able to move up and down, and its lower limit is given by a stopper 70 with a slope, and the stopper 70 with a slope is a drive motor and a worm reducer (not shown). Entry / exit is adjusted via 71. Similarly, the second mold frame 24 is supported by a hydraulic cylinder 9 so as to be able to move up and down, and the lower limit thereof is given by a stopper 72 with a slope, and the stopper 72 with a slope is a drive motor and a worm reducer 73 not shown. The amount of entry and exit is adjusted via. By adjusting the amount of the sloped stoppers 70 and 72 coming in and out, the step amount of the bar member 1 and the pushing amount of the bar member 2 can be easily adjusted.

The hydraulic cylinder 9 has a servo valve 74.
Is connected, and the second mold frame 24 is pushed down while giving a slight vibration (about 100 Hz) with various waveforms by the servo valve 74 and the hydraulic cylinder 9, thereby giving a slight vibration in the end face direction to the trailing bar material 2. ..

FIG. 19 shows that the second bar frame 24 is vibrated to the trailing bar member 2 held by the molds 6 and 7,
The relationship between the joining time t when the pressing force Q is applied, the die pressing stroke S, and the pressing force Q is shown. During joining, the bar members are pushed down by the servo valve 74 and the hydraulic cylinder 9 while being slightly vibrated as described above, and the joining is completed. Next, the bar material is held while the vibration of the bar material is stopped and the pressing force Q is maintained.

According to a test conducted by the inventors of the present application, a bar plate having a thickness of 40 mm, a pushing-down speed of 100 mm / sec, a joining time t of about 0.4 sec, a slight vibration is applied, and then a holding time of about 1 sec is sufficient for sufficient joining. It was confirmed that strength was obtained. The slight vibration may be applied to the first mold frame 23, or may be applied to both the first and second mold frames 23 and 24. Further, the slight vibration may be given by applying ultrasonic waves.

According to this embodiment, adjustment of the step amount in the plate thickness direction between the leading bar material and the trailing bar material and the second mold frame 2
It is possible to easily adjust the pressing amount of 4 according to the plate thickness of the bar material. Further, by applying a slight vibration to apply the pressing force Q, the pulverization and dispersion of the surface oxide scale at the joint portion of the bar material is promoted, and the joint strength can be increased.

In the above embodiments, the joining pressing direction of the joining machine is all in the plate thickness direction of the bar material, but relative sliding may occur in the bar width direction of the bar material with the same joining principle. The present invention can be easily applied to this case as well.

Further, in the above-described embodiment, the mold of the first mold frame is used as a clamping mold, a step is given (pushed down) to the preceding bar material 1, and then the mold of the second mold frame is formed. Although the die is used as a pressing die and the trailing bar 2 is pushed down for joining, the first die frame is pushed up to give a step, and then the second die frame is pushed up for joining. The same effect can be obtained with the configuration. Further, the same effect can be obtained by a method in which the mold of the first mold frame is pushed down as a pressing mold and the mold of the second mold frame is used as a clamping mold to provide a step. Further, one of the first mold frame and the second mold frame was moved up and down to exert a pressing force, but the first mold frame was designed so that the bar material 1 and the bar material 2 would generate relative slip. Even if the second mold frame and the second mold frame are moved up or down in opposite directions, the same joining can be performed.

Further, in the above embodiments, the case of joining the bar materials after the rough rolling has been described, but the present invention can be similarly applied to a joining device for joining the slabs before the rough rolling.

The invention was applied,

[0077]

According to the present invention, both rolling materials are reliably joined in a short time by the relative slip between both end surfaces and the pressing accompanied by plastic deformation, and the wedge effect is generated when pressing the rolled material end surfaces. Since the horizontal force that is received is received by the link means and does not act on the vertical member of the main body frame,
Miniaturization of the joining device can be achieved. In addition, since there is no mechanical sliding portion at the time of pressing and joining, and instead it is supported by the fulcrum of the link means, mechanical loss is small and the output of the first actuating means can be made small.

Further, since it becomes easy to adjust the amount of pressure bonding, the amount of step difference and the amount of pressing down of the die according to the plate thickness of the rolled material and the shape of the end face cut, automatic operation is possible.

Further, no sagging of the joint portion occurs, and sufficient joint strength can be obtained which does not hinder the transportation and rolling of the bar material.

Further, even if the metal mold surface having irregularities is used, it can be easily separated from the metal mold after joining, and the rolled material can be conveyed smoothly.

Further, since the play of the link means is eliminated, the amount of crimping can be adjusted accurately and the reliability of joining can be improved.

Further, since the oxide scale on the end surface of the rolled material can be sufficiently removed, the joining strength is increased.

From the above, it is possible to achieve the effect of realizing a rolling material joining apparatus which is excellent in economic efficiency and operability in a hot rolling facility which enables joining of rolled materials in an extremely short time.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional side view of a hot-rolled material joining apparatus according to an embodiment of the present invention.

FIG. 2 is a partial front view of the joining device shown in FIG. 1 as viewed from the right in the figure.

3 is a partial cross-sectional rear view of the joining device shown in FIG. 1 as viewed from the left in the drawing.

FIG. 4 is a schematic view of a continuous hot rolling facility equipped with the joining device shown in FIG.

5 is a diagram showing a procedure of a joining operation by the joining device shown in FIG.

6A and 6B are diagrams showing details of a step giving procedure and a joining procedure in the procedure of the joining work shown in FIG. 5, wherein FIG. 6A shows a step giving procedure and FIG. 6B shows a joining procedure.

7 is an explanatory diagram of a link mechanism of the joining device shown in FIG.

8 is a diagram showing a relationship between a step amount a and a crimping amount x by the link mechanism shown in FIG.

9A and 9B are diagrams showing the effect of the mold shape by the joining apparatus shown in FIG. 1, FIG. 9A showing a joining state according to the present embodiment,
For comparison, (B) shows a joined state when the shape of this example is not adopted.

FIG. 10 is a partial cross-sectional side view of a hot-rolled material joining apparatus according to another embodiment of the present invention.

FIG. 11 is a partial front view of the joining device shown in FIG. 10 as viewed from the right in the figure.

12 is a view showing the bar material lifting member in the lowered position of the joining apparatus shown in FIG.

13 is a view showing a bar material lifting member in a raised position of the joining apparatus shown in FIG.

14 is a sectional view taken along line XIV-XIV in FIG.

15 is an explanatory diagram of a link mechanism of the joining device shown in FIG.

16 is a diagram showing the operating principle of the link mechanism shown in FIG.

17 is a connecting pin D ₁ according to the link mechanism shown in FIG.
It is a figure which shows the relationship between the position y and the amount of pressure bonding x.

FIG. 18 is a partial cross-sectional side view of a hot-rolled material joining apparatus according to still another embodiment of the present invention.

19 is a diagram showing the relationship between the joining time t of the joining apparatus shown in FIG. 18, the die pressing amount S, and the pressing force Q.

[Explanation of symbols]

 1 Leading bar material 1a Rear end part 2 Trailing bar material 2a Tip part 3 Joining machine 3a Main body frame 3c, 3d Bracket 4,5,6,7 Mold 8 Hydraulic cylinder (second operating means) 9 Hydraulic cylinder (No. 1 operation means) 21,22 link (link means) 23 first mold frame 24 second mold frame 25a to 25d connecting pin 40 movable frame 44 bar material lifting member 46 hydraulic cylinder 70, 72 sloped stopper 74 Servo valve

 ─────────────────────────────────────────────────── --- Continuation of the front page (72) Inventor Tadashi Nishino 3-1-1, Saiwaicho, Hitachi City, Ibaraki Hitachi Ltd. Hitachi factory (72) Inventor Takao Funamoto 4026, Kuji Town, Hitachi City, Ibaraki Prefecture Hitachi Research Laboratory, Hiritsu Manufacturing Co., Ltd.

Claims (11)

[Claims] 1. A hot rolling material joining apparatus for joining a preceding rolling material and a following rolling material in a line of hot rolling equipment, comprising: (a) a rear end portion of the preceding rolling material and the following rolling material. Movable first and second mold devices that respectively independently hold the distal end of the first mold device; and (b) a first mold device that applies a driving force to at least one of the first and second mold devices. (C) The first and second mold apparatuses are operatively connected to each other, and when the driving force by the first operation means is applied, the first and second mold apparatuses are operated. One against the other,
Link means for moving in an oblique direction toward the other side;
A hot-rolled material joining apparatus, comprising: 2. The hot-rolled material joining apparatus according to claim 1, wherein the link means constitutes a quadrilateral link with the first and second mold devices. Joining device. 3. The hot-rolled material joining apparatus according to claim 1, wherein the link means has a plurality of links and connecting pins, and at least one position of the plurality of connecting pins is adjustable. The hot-rolled material joining apparatus is characterized in that the amount of movement of the one die device in the length direction of the rolled material plate can be adjusted when the driving force by the first actuating means is applied. 4. The hot-rolled material joining apparatus according to claim 1, wherein the hot-rolled material is joined in a direction orthogonal to a length direction of the rolled material sheet of one of the die devices when a driving force is applied by the first operating means. Further comprising a first stopper means for limiting the movement amount,
A device for joining hot-rolled material, wherein the height of the first stopper means is adjustable. 5. The hot-rolled material joining device according to claim 1, wherein one of the first and second die devices is moved with respect to the other, and the hot-rolled material joining device is orthogonal to the length direction of the rolled material plate. A second actuating means for forming a step in a direction; and the linking means is configured so that the position of the fulcrum associated with the one mold device does not change during movement by the second actuating means. A joining device for hot rolled material. 6. The hot-rolled material joining apparatus according to claim 5, wherein the amount of movement of the one die device in a direction orthogonal to the length direction of the rolled material plate is restricted when the hot working material is moved by the second operating means. A hot-rolled material joining apparatus, further comprising second stopper means, wherein the height of the second stopper means can be adjusted. 7. The apparatus for joining hot-rolled material according to claim 1, wherein the first and second mold devices are respectively an upper and lower unit.
A pair of molds, and a lower mold of the first mold device has a length capable of supporting a part of the trailing end of the preceding rolled material and the leading end of the trailing rolled material; 2. The apparatus for joining hot-rolled material, wherein the upper die of the die apparatus of 2 has a length capable of supporting a front end portion of a trailing rolled material and a part of a rear end portion of a preceding rolled material. 8. The hot-rolled material joining apparatus according to claim 1, wherein the preceding rolled material and trailing rolled material after joining can be lifted and lowered for lifting from the surfaces of the first and second mold devices. A hot-rolled material joining device, further comprising lifting means. 9. The hot-rolled material joining apparatus according to claim 1, further comprising means for preliminarily applying a force in a direction of a load acting on the link means to remove play. Material joining device. 10. The hot-rolled material joining apparatus according to claim 1, wherein when the one die apparatus is moved in an oblique direction toward the other die apparatus by the link means, the hot-rolled material and the pre-rolled material are combined with each other. A hot-rolled material joining apparatus, further comprising means for applying vibration to at least one of the row-rolled materials. 11. A continuous hot rolling facility having at least one rough rolling mill and a finishing rolling mill group, which is installed between the rough rolling mill and the finishing rolling mill group and rolled by the rough rolling mill. A movable first first welding device comprising a joining device for sequentially joining bar members, wherein the joining device independently holds (a) a trailing end portion of the preceding rolled material and a leading end portion of the trailing rolled material. And (b) first actuation means for applying a driving force to at least one of the first and second mold devices; (c) the first and second mold devices; When the driving force is applied by the first actuating means, one of the first and second mold devices is connected to the other,
Link means for moving in an oblique direction toward the other side;
A continuous hot rolling facility comprising: