WO2020245913A1 - Coating film removal device, coating film removal method, joining device, and joining method - Google Patents

Abstract

A coating film removal device (60) according to the present invention is provided with: pairs of brush rolls (61A, 61B) each for removing surface coating films formed on the obverse and reverse of a corresponding one of steel sheets S which are joining targets; and pairs of pressure application rolls (62A, 62B) each for holding the steel sheet S having the surface coating films removed by a corresponding one of the pairs of brush rolls (61A, 61B) from the obverse and reverse and for applying pressure to the joining target while moving with respect to the joining target. The coating film removal device (60) according to the present invention, when removing the surface coating films, applies pressure to each of the steel sheets S from the obverse and reverse by using a corresponding one of the pairs of pressure application rolls (62A, 62B). Therefore, even if each of the steel sheets S undergoes deformation such as undulation, deformation is reduced in a pressure application portion during pressure application.

Description

Film removal device, film removal method, joining device and joining method

The present invention relates to a technique for removing a surface coating formed on a joint portion prior to overlapping and joining the ends of two metal plates, such as mash seam welding.

In mash seam welding, for example, as described in Patent Document 1, the ends of two metal plates are overlapped, the overlapped portion is pressurized by a pair of electrode rings, and a welding current is continuously applied. After welding, a pair of reduction rolls are used to flatten the overlapping steps.

Insulating coatings such as oxide scale, plating film, and coating may exist on the surface of the metal plate. In order to stably mash seam weld a metal plate having an insulating surface coating (hereinafter, simply surface coating), it is necessary to remove the surface coating. For example, Patent Document 1 proposes a welding apparatus having a function of removing a surface coating. The device of Patent Document 1 includes a brush as a rotary tool for removing the surface coating, and the brush can be raised and lowered by a cylinder.

Japanese Unexamined Patent Publication No. 2001-150145

In the device of Patent Document 1, since the brush can be raised and lowered, the surface coating can be removed by placing the brush at an appropriate position with respect to the metal plate to be joined. However, when the end portion of the metal plate is deformed due to undulation or the like, the contact state between the brush and the metal plate becomes non-uniform. Then, it may occur that the surface coating can be removed in one portion, but the surface coating cannot be removed sufficiently in another portion.

Therefore, the present invention provides a removing device and a removing method capable of stably removing the surface coating even if the metal plate has a deformed end due to undulation or the like, and a joining device and a joining method provided with the removing device. The purpose is.

In the film removing device according to the present invention, a pair of abrasives for removing surface coatings formed on the front and back surfaces of the joining object and a joining object for which the surface coating is removed by the pair of abrasives are sandwiched between the front and back surfaces. It is provided with a pair of pressurizing bodies that pressurize while moving.

The present invention is a method of removing the surface coating formed on the front and back surfaces of a bonding object with a pair of abrasives provided on the front and back surfaces, and the bonding target is formed on the front and back surfaces by a pair of pressurizing bodies provided on the front and back surfaces. The surface coating is removed by a pair of abrasives by applying pressure while moving to the object to be joined.

The present invention is a joining device for superimposing and joining the ends of a first joining target and a second joining target, and the surfaces formed on the front and back surfaces of the first joining target and the second joining target to be overlapped. A film removing portion for removing the coating film and a joining portion for joining the first joining target from which the surface coating has been removed and the end portions of the second joining target in a superposed state are provided.
The film removing portion in the present invention includes a pair of abrasives for removing surface coatings formed on the front and back surfaces of the first bonding object and the second bonding object, and a first bonding object for which the surface coating is removed by the grinding material. A pair of pressurizing bodies that pressurize each of the second joining objects by sandwiching them from the front and back are provided.

The present invention is a joining method in which the ends of the first joining target and the second joining target are overlapped and joined, and the surfaces formed on the front and back surfaces of the first joining target and the second joining target to be overlapped. A coating removing step for removing the coating film and a joining step for joining the first joining target from which the surface coating has been removed and the ends of the second joining target in a superposed state are provided.
In the film removing step in the present invention, the bonding target is sandwiched from the front and back by a pair of pressure bodies provided on the front and back surfaces, and pressure is applied while moving to the bonding object, and the surface coating is removed by a pair of abrasives.

In the film removing device according to the present invention, when the surface film is removed, the bonded object is pressed from the front and back by a pressurizing body. Deformation is reduced at the site, and the relative position of the joint target with respect to the abrasive can be kept constant. As a result, the reaction force applied to the abrasive from the bonding target can be made uniform, so that the surface coating can be stably removed.

The schematic structure of the welding apparatus which concerns on one Embodiment of this invention is shown, (a) is a side view, (b) is a plan view. It is a front view which shows the schematic structure of the surface coating removal part which concerns on this embodiment. It is a side view which shows the schematic structure of the surface coating removal part which concerns on this embodiment. The operation of the surface coating removing portion according to the present embodiment is shown, (a) shows a standby state in which the surface coating is not removed, (b) shows a working state in which the surface coating is removed, and (c) faces the steel sheet. The movement locus of the tip of the brush roll is shown. The process of correcting the deformation of the bonding target in the surface coating removing portion according to the present embodiment is shown. It is a partial front view which shows each process in the welding apparatus which concerns on this embodiment, (a) shows a film removal process, (b) shows a shearing process, (c) shows a welding process, (d) is The reduction process is shown. Following FIG. 6, (a) shows a cooling step, (b) shows a heating step, and (c) shows an air cooling step. The process in which the welding device of the present embodiment moves on the outward path is shown, (a) shows the position when the welding device is in the retracted position, (b) shows the position in the film removing step, and (c) shows the cutting step. Indicates the position at the time of. Following FIG. 8, the process in which the welding apparatus moves on the return path is shown, (a) the position during the welding step and the reduction step is shown, (b) shows the position during the cooling step, and (c) shows the heating step. The position at the time of the process is shown, and (d) shows the time when it returns to the retracted position. It is a figure which shows the positional relationship of a pair of holding rolls in this embodiment. It is a figure explaining the effect obtained by adopting the positional relationship of the presser roll shown in FIG. 10, (a) corresponds to the AA cross section of FIG. 10, and (b) is the BB cross section of FIG. Corresponds to, and (c) corresponds to the CC cross section of FIG. It is a figure explaining the 1st means corresponding to the wear of the brush roll in this embodiment. It is a figure explaining the 2nd means corresponding to the wear of the brush roll in this embodiment. It is a figure which shows the alternative means of the holding roll as a straightening body in this embodiment.

The joining device 1 according to a preferred embodiment of the present invention will be described with reference to the drawings.
The joining device 1 is provided in the middle of the transport path P1 in which the steel plate S to be joined is conveyed, and the steel plate S and the ends of the steel plate S are joined by welding. The joining device 1 includes a coating removing portion 60 capable of stably removing the coating even if the end portion of the steel plate S to be joined is deformed due to undulation or the like.
Hereinafter, the configuration and operation of the joining device 1 will be described in order, and then the effects of the joining device 1 will be referred to.

[Structure of Joining Device 1]
As shown in FIG. 1, the joining device 1 includes a welded portion 20 for performing mash seam welding (JIS Z 3001) and a compression lower portion 30 for pressurizing a portion welded by the welded portion 20. There is. This welded portion includes a portion in which the rear end of the leading steel plate S1 and the tip of the trailing steel plate S2 are overlapped with each other, and has a thick step as compared with the portion other than the welded portion. Crush until the wall thickness is almost the same as the above to improve the degree of flattening.

Further, the joining device 1 includes a cooling unit 40 that supplies spray water to the welded portion that has been reduced by the reduction portion 30, and a heating unit 50 that heats the welded portion to which the spray water has been supplied.
Further, the joining device 1 includes a film removing portion 60 that mainly removes the oxide scale on the surface of the steel sheet S to be joined before welding, and a steel plate S from which the surface coating such as the oxide scale is removed by the film removing portion 60. It includes a cutting portion 90 for cutting the end portion by shearing.

In the joining device 1, the welding portion 20, the compression lower portion 30, the cooling portion 40, the heating portion 50, the coating removing portion 60, and the cutting portion 90 are supported by the moving frame 10. The moving frame 10 reciprocates with respect to the predetermined transfer path P1 of the steel plate S, and the welded portion 20, the compression lower portion 30, the cooling portion 40, the heating portion 50, the film removing portion 60, and the cutting portion 90 also reciprocate. Along with the movement, it reciprocates with respect to the transport path P1.

[Movement frame 10]
As shown in FIG. 1A, the moving frame 10 has a C-shaped side view, and has a connecting end 11A along the height direction H at one end and a connecting end 11A at the other end. An opening 11B is provided. The height direction H coincides with the vertical direction v.
As shown in FIG. 1B, the moving frame 10 is arranged with the opening 11B facing the transport path P1. In the moving frame 10, the side where the opening 11B is provided is defined as the front (F), and the side where the connection end 11A is provided is defined as the rear (B).

The moving frame 10 includes a pair of upper and lower support bases 12A and 12B that are connected to the connection end 11A and extend toward the front (F). The support bases 12A and 12B are provided along the length direction L at predetermined intervals in the height direction H. The support base 12A is arranged above and the support base 12B is arranged below. The length direction L coincides with the horizontal direction h.

The support base 12B is provided with a plurality of wheels 13, 13 ... Required for moving the moving frame 10 on the side of the lower surface 14. The wheel 13 can reciprocate the moving frame 10 by rotating forward or reverse with a drive source (not shown). The wheel 13 is just an example, and for example, a linear guide can be used as a means of transportation. According to the linear guide, there is an advantage that the movement of the moving frame 10 is smoother and the position of the moving frame 10 in the vertical direction is easily stabilized.
Between the support base 12A and the support base 12B, a heating portion 50, a coating removing portion 60, a cooling portion 40, a compression lower portion 30, a welding portion 20, and a cutting portion 90 are provided in this order from the front side.

The moving frame 10 has at least a position of retracting from the transport path P1 (FIGS. 1 and 8 (a): retracted position) and a cutting portion 90 supported by the moving frame 10 reaches the transport path P1 to completely complete the steel plate S. It reciprocates between the position where it can be cut (FIG. 8 (c): forward position) and the position where it can be cut. The direction in which the moving frame 10 reciprocates is the same as the welding direction of the steel plate S. Even if the moving frame 10 passes the forward position to some extent, it may move backward and adjust the position when cutting the steel plate S. A transport path P1 for transporting the steel plate S is arranged on the front side of the moving frame 10 placed in the retracted position. As the moving frame 10 reciprocates, the steel plate S moves relatively forward and backward between the support base 12A and the support base 12B of the moving frame 10. The path through which the steel plate S moves between the support base 12A and the support base 12B is referred to as a movement path P2, and the movement path P2 and the transport path P1 are orthogonal to each other.

The moving frame 10 stands by at a position retracted from the transport path P1 in a retracted position until the steel plate S is transported.
When the steel plate S is conveyed, the moving frame 10 moves from the retracted position to the forward position. In the outward path in which the moving frame 10 moves from the retracted position to the forward position, the surface coating of the steel plate S is removed by the coating removing portion 60, and the steel plate S is cut by the cutting portion 90. Although details will be described later, the operation of this outbound route is shown in FIGS. 8A, 8B, and 8C.

When the moving frame 10 moves on the outward route and reaches the forward position, it moves on the return route that returns to the backward position. In this return path, welding, flattening of the welded portion, and heat treatment of the welded portion are continuously performed by making the welded portion 20, the compression lower portion 30, the cooling portion 40, and the heating portion 50 function. Hereinafter, the film removing portion 60 and the cutting portion 90 that function on the outward route will be described, and then the welded portion 20 to the heating portion 50 that function on the return route will be described.

[Film removal unit 60]
The film removing portion 60 removes the surface film of the portion of the steel sheet S where welding is planned. Even if the portion to be welded is deformed due to undulation or the like, the film removing portion 60 is provided with holding rolls 62A and 62B for flattening the deformation when removing the film, thereby stably removing the surface film. Realize.

As shown in FIGS. 1A, 2 and 3, the film removing portion 60 includes a pair of upper and lower brush rolls 61A and 61B, and support brackets 64A and 64B for supporting the brush rolls 61A and 61B, respectively. To be equipped. The brush rolls 61A and 61B are fixed to the spindles 63A and 63B rotatably supported by the support brackets 64A and 64B. As will be described in detail later, the presser rolls 62A and 62B are mounted coaxially with the brush rolls 61A and 61B so as to idle on the spindles 63A and 63B.

In this embodiment, as shown in FIGS. 1B and 2, a pair of upper and lower brush rolls 61A and 61B are provided side by side at intervals in the direction of the transport path P1. As shown in FIG. 2, the brush rolls 61A and 61B provided on the upstream side α of the transport path P1 are provided on the downstream side β of the transport path P1 after removing the surface coating of one of the steel plates S to be welded. The brush rolls 61A and 61B remove the surface coating of the other steel plate S to be welded. Since one steel plate S is conveyed to the joining device 1 before the other steel plate S, it is called a leading steel plate S1, and the other steel plate S is followed by the one steel plate S and then the joining device 1. It is called a trailing steel plate S2 because it is transported to. When it is not necessary to distinguish between the two, they are collectively referred to as a steel plate S.

As shown in FIG. 1A, the brush roll 61A and the brush roll 61B are arranged so as to face each other above and below the height direction H with the movement path P2 in between. The brush roll 61A and the brush roll 61B are arranged so that the positions of the brush roll 61A and the brush roll 61B coincide with each other in the length direction L and the width direction W.

The brush rolls 61A and 61B are removed by scraping off the surface coating by rotationally driving while the outer peripheral surfaces of the brush rolls 61A and 61B are in contact with the upper and lower surfaces of the steel plate S. As shown in FIGS. 2 and 3, the brush rolls 61A and 61B have a form in which a plurality of wires are planted on the outer periphery of the roll-shaped member. The rotational drive of the brush rolls 61A and 61B is driven by the power of the drive source (motor). As long as the surface coating can be removed, the specific means of the abrasive for removing the coating is arbitrary, and instead of the brush rolls 61A and 61B, for example, a grinding wheel in which hard abrasive grains are accumulated on the outer peripheral surface. An elastic tool or the like using a hard non-woven fabric is applied.

The brush roll 61A arranged above the moving path P2 is supported by the hydraulic cylinder 65A and moves up and down with respect to the moving path P2. The piston rod of the hydraulic cylinder 65A is connected to the support bracket 64A that supports the brush roll 61A.
The brush roll 61B arranged below the moving path P2 is supported by the hydraulic cylinder 65B, and can move up and down with respect to the moving path P2 in the same manner as the brush roll 61A. The piston rod of the hydraulic cylinder 65B is connected to the support bracket 64B that supports the brush roll 61B. The elevating relationship described here also applies to the electrode rings 21A and 21B of the welded portion 20 and the reduction rolls 31A and 31B of the compression lower portion 30, which will be described later.
When the surface coating is removed by the brush rolls 61A and 61B, the brush rolls 61A and 61B are moved up and down to bring the brush roll 61A and the brush roll 61B into contact with the steel plate S with appropriate pressure.

As shown in FIG. 2, the brush rolls 61A and 61B are intended to remove a region at a predetermined distance from the rear end BE of the leading steel plate S1, and at a predetermined distance from the tip FE of the trailing steel plate S2. The area to be removed is targeted for removal. Both the leading steel plate S1 and the trailing steel plate S2 are cut by the cutting portion 90 so that the cut surface is located in the target region for film removal. As a result, the rear end side of the leading steel plate S1 and the front end side of the trailing steel plate S2 are removed.

In the present embodiment, as shown in FIGS. 1, 2 and 3, the presser rolls 62A and 62B corresponding to the brush rolls 61A and 61B are provided. The presser rolls 62A and 62B move with respect to the steel plate S, and the portion of the steel plate S is tentatively undulated by pressurizing the portion adjacent to the portion where the surface coating is removed by grinding with the brush rolls 61A and 61B from above and below. It can be flattened even if it is deformed. When the brush rolls 61A and 61B remove the surface coating, the presser rolls 62A and 62B rotate as the steel plate S in contact with the presser rolls S is conveyed. Since the positions of the presser rolls 62A and 62B in the length direction L are fixed, the movement with respect to the steel plate S as used herein means a relative movement due to the steel plate S being conveyed.

As shown in FIGS. 2 and 3, the presser rolls 62A and 62B are provided inside the brush rolls 61A and 61B in the width direction W of the moving frame 10 at a small distance from the brush rolls 61A and 61B. There is. The presser rolls 62A and 62B are provided inside the steel plate S because the deformation of the steel plate S becomes larger toward the front end or the rear end side of the steel plate S, especially when the front end or the rear end of the steel plate S undulates in the length direction L. This is because the deformation of the steel sheet S can be more reliably flattened by pressurizing the end side of the steel sheet S more than the brush rolls 61A and 61B.
In the present embodiment, the pressing rolls 62A and 62B have a smaller diameter than the brush rolls 61A and 61B. This is because when the surface coating is removed, the tips of the brush rolls 61A and 61B bend and come into contact with the steel plate S, so that the repulsive force of the wires on the outer circumference of the brush rolls 61A and 61B can be used more reliably. This is because the film can be removed.

The materials of the presser rolls 62A and 62B are arbitrary as long as the purpose can be achieved, and are selected from metal materials, ceramic materials, resin materials and the like. Further, although the presser rolls 62A and 62B can be configured as a single unit, they can also be configured by combining a plurality of members. For example, the holding rolls 62A and 62B can be formed by fitting an annular member around the disk-shaped member. In this case, the disc-shaped member and the annular member can be made of different materials.

The film removing unit 60 has the following configuration for rotationally driving the brush rolls 61A and 61B. The following configuration is just an example, and the brush rolls 61A and 61B can be rotationally driven by other configurations.

The coating removing portion 60 includes motors 66A and 66B which are drive sources for brush rolls 61A and 61B, first pulleys 68A and 68B fixed to output shafts 67A and 67B of the motors 66A and 66B, and first pulleys 68A and 68B. The second pulleys 69A and 69B corresponding to 68B are provided. The first conduction belts 73A and 73B are hung around the first pulleys 68A and 68B and the second pulleys 69A and 69B, and the rotational driving force of the output shafts 67A and 67B is from the first pulleys 68A and 68B to the second pulley 69A. , 69B is transmitted.

The coating removing portion 60 includes rotating shafts 75A and 75B to which the second pulleys 69A and 69B are fixed, and third pulleys 71A and 75B fixed to the rotating shafts 75A and 75B outside the width direction W of the second pulleys 69A and 69B. The 71B and the fourth pulleys 72A and 72B corresponding to the third pulleys 71A and 71B are provided. The second conduction belts 74A and 74B are hung around the third pulleys 71A and 71B and the fourth pulleys 72A and 72B, and the fourth pulleys 72A and 72B are fixed to the spindles 63A and 63B. Therefore, the rotational driving force transmitted to the second pulleys 69A and 69B is transmitted to the brush rolls 61A and 61B via the spindles 63A and 63B.

When the surface coating is removed by the brush rolls 61A and 61B, the coating removing portion 60 can supply cooling water for cooling and lubricating the ground portion. In this case, as shown in FIGS. 2 and 3, waterproof covers 76A and 76B can be provided in order to prevent the cooling water from scattering to the surroundings. Since the waterproof covers 76A and 76B are divided into upper and lower parts, the waterproof curtains 77A and 77B are provided between the waterproof cover 76A and the waterproof cover 76B to more effectively prevent the cooling water from scattering to the surroundings. be able to.

In the film removing section 60, when the brush rolls 61A and 61B and the pressing rolls 62A and 62B do not remove the surface film, they are in a standby position away from the steel plate S as shown in FIG. 4A to remove the surface film. At that time, as shown in FIG. 4B, the work position is moved to the working position in contact with the steel plate S. Since the brush rolls 61A and 61B move up and down while moving relative to the steel plate S, the tip portion of the brush roll has a movement locus as shown in FIG. 4C. The relative movements shown in FIG. 4 (c) are movements in both the horizontal direction h and the vertical direction v.
At the working position, the brush rolls 61A and 61B are rotationally driven by using the motors 66A and 66B as drive sources. Assuming that the steel plate S is conveyed in the orientation DS of FIG. 4B, the brush rolls 61A and 61B rotate in the orientation D61.
As described above, the presser rolls 62A and 62B are attached to the spindles 63A and 63B so as to idle. Therefore, at the working position, the pressing rolls 62A and 62B rotate in the direction D62 following the conveying direction DS of the steel plate S.

With reference to FIG. 5, the behavior of the process in which the steel plate S passes between the pressing rolls 62A and 62B at the working position will be described.
FIG. 5A shows a state in which the steel plate S is about to enter between the pressing rolls 62A and 62B. The end of the steel plate S is undulating and deformed. However, when entering between the pressing rolls 62A and 62B, as shown in FIG. 5B, the pressing rolls 62A and 62B pressurize, so that the portion between the pressing rolls 62A and 62B and its vicinity become a flat FL. Become. As shown in FIG. 5C, the flat FL portion of the deformed steel plate S continuously moves to the rear end BE of the steel plate S until the steel plate S is further conveyed and passes between the pressing rolls 62A and 62B. To do.

As described above, even if the steel plate S is deformed, it becomes a flat FL by being pressed by the pressing rolls 62A and 62B. Therefore, in this flat FL region, the position relative to the brush rolls 61A and 61B Becomes constant. Therefore, the surface coating can be stably removed by the brush rolls 61A and 61B. As a result, the brush rolls 61A and 61B can come into contact with the steel plate S with an even force, so that the surface coating can be stably removed. On the other hand, even if the surface coating is to be removed by the brush rolls 61A and 61B while being deformed, the surface coating where the brush rolls 61A and 61B are in strong contact is easily removed, but the surface coating where the brush rolls 61A and 61B are in strong contact is easily removed. The degree of removal of the surface coating is not stable.

[Cut portion 90]
The cut portion 90 cuts and removes the predetermined region of the preceding steel plate S1 and the trailing steel plate S2 whose surface coating has been removed by the coating removing portion 60.
As shown in FIG. 1A, the cutting portion 90 includes a pair of upper and lower shear blades 91A and 91B, each of which moves up and down by a drive source (not shown).

In this embodiment, as shown in FIGS. 1B and 6B, a pair of upper and lower shear blades 91A and 91B are provided side by side at intervals in the direction of the transport path P1. .. As shown in FIG. 6B, the shear blades 91A and 91B provided on the upstream side α of the transport path P1 target the leading steel plate S1 for cutting, and the shear blades 91A and 91B provided on the downstream side β of the transport path P1. 91B targets the trailing steel plate S2 for cutting.

As shown in FIG. 1A, the shear blade 91A and the shear blade 91B are arranged so as to face each other above and below the height direction H with the movement path P2 in between. The shear blade 91A and the shear blade 91A are arranged so that the length directions L coincide with each other.

[Welded portion 20]
Next, the welded portion 20 that functions on the return path will be described.
As shown in FIGS. 1 (a) and 6 (c), the welded portion 20 has a pair of upper and lower electrode rings 21A and 21B and support rods 22A and 22B that rotatably support the electrode rings 21A and 21B, respectively. And.
The electrode ring 21A and the electrode ring 21B are arranged so as to face each other in the vertical direction H above and below the moving path P2. The electrode ring 21A and the electrode ring 21B are arranged so that the positions of the electrode ring 21A and the electrode ring 21B coincide with each other in the length direction L and the width direction W.

The electrode ring 21A arranged above the moving path P2 is supported by the hydraulic cylinder 23 and moves up and down with respect to the moving path P2. The support rod 22A that supports the electrode ring 21A constitutes a piston rod that is connected to the piston 24 of the hydraulic cylinder 23.
When the steel plate S is welded by the electrode rings 21A and 21B, the electrode ring 21A is lowered to bring the electrode ring 21A and the electrode ring 21B into contact with the steel plate S with appropriate pressure.
The electrode ring 21B arranged below the movement path P2 is supported by a support rod 22B fixed to the support base 12B.

[Compression lower part 30]
Next, the compression lower portion 30 will be described.
As shown in FIG. 1A, the compression lower portion 30 is provided adjacent to the front (F) side of the welded portion 20, and reduces the welded portion of the steel plate S welded by the welded portion 20. Flatten. The plastic working performed here is called swaging.

As shown in FIGS. 1A and 6D, the compression lower portion 30 has support rods 32A and 32B that rotatably support the pair of reduction rolls 31A and 31B and the reduction rolls 31A and 31B, respectively. And. In addition, in FIG. 6 and FIG. 7, the welded portion is shown in black.
The reduction roll 31A and the reduction roll 31B are arranged so as to face each other above and below the height direction H with the movement path P2 interposed therebetween. The reduction roll 31A and the reduction roll 31B are arranged so that the positions of the reduction roll 31A and the reduction roll 31B coincide with each other in the length direction L and the width direction W.

The reduction roll 31A arranged above the moving path P2 is supported by the hydraulic cylinder 33 and moves up and down with respect to the moving path P2. The support rod 32A that supports the reduction roll 31A constitutes a piston rod that is connected to the piston 34 of the hydraulic cylinder 33. When pressure is applied to the welded portion by the reduction rolls 31A and 31B, the reduction roll 31A and the reduction roll 31B apply an appropriate pressure to the welded portion of the steel plate S by lowering the reduction roll 31A.
The reduction roll 31B arranged below the movement path P2 is supported by a support rod 32B fixed to the support base 12B. The reduction roll 31B may move up and down with respect to the moving path P2 by the expansion and contraction operation of the support rod 32B.

The surface temperature of the portion rolled by the welded portion 20 becomes, for example, a temperature exceeding 1300 ° C., but the temperature of the portion is lowered to, for example, 900 ° C. or less due to contact with the pressure lower portion 30, and then the temperature is increased by reheating. ..

[Cooling unit 40]
Next, the cooling unit 40 will be described.
As shown in FIGS. 1 and 7A, the cooling unit 40 supplies the cooling water CW from the watering nozzle 41 toward both the upper surface and the lower surface of the welded portion flattened by the compression lower portion 30. By supplying this cooling water CW, the welded portion is rapidly cooled and hardened.
This cooling water CW is preferably supplied as granules. As the granules, there are mist-like particles having a small particle size and shower-like particles having a larger particle size than mistakes and shapes, but mist-like cooling water is preferable. The reason is as follows. That is, the amount of water used is reduced by making the cooling water mist. This is because the water treatment equipment can be made small and simple, and the amount of water is reduced, so that the amount of cooling water reaching the compression lower portion 30 is also reduced.

In the example shown here, the cooling unit 40 is provided above and below the moving path P2, but this is only an example, and as long as sufficient cooling capacity can be obtained, it is only above or below the moving path P2. It can also be provided only on. One or three or more cooling units 40 may be provided along the movement path P2. Further, although an example of cooling water CW is shown here as a cooling medium, another cooling medium such as air can be used as long as sufficient cooling ability can be obtained.

[Heating unit 50]
Next, the heating unit 50 will be described.
As shown in FIGS. 1 and 7B, the heating unit 50 heats the welded portion hardened by the supply of cooling water from the cooling unit 40 by the heater 51 and tempers it.

As long as the tempering action can be exhibited, the mechanism by which the heating portion 50 heats the welded portion does not matter. For example, a heater using a heating wire, a heater using a flame, a heater using IH (Induction Heating), and the like are applied.
Among these, the IH heater applies an electromagnetic field generated from the electromagnetic coil to the welded portion of the steel plate S to allow an induced eddy current to flow through the welded portion. Since the steel plate S has an electrical resistance, the welded portion generates heat due to the flowing current. As described above, when the IH heater is used as the heating unit 50, it is easy to realize rapid heating of the steel plate S. The details of tempering will be described later.

As shown in FIG. 7C, when the steel sheet S passes through the heating unit 50, the steel sheet S is air-cooled to room temperature by the ambient air. The leading steel sheet S1 and the trailing steel sheet S2 connected at the welded portion are used as an integral steel sheet S, for example, in the next rolling.
Here, the heating portion 50 is provided only below the steel plate S, but it can also be provided both above and below the steel plate S.

[Welding procedure]
Next, the procedure for welding the leading steel plate S1 and the trailing steel plate S2 using the joining device 1 will be further described with reference to FIGS. 8 and 9. Note that FIG. 8 shows a process in which the joining device 1 moves on the outward path, and FIG. 5 shows a process in which the joining device 1 moves on the return path.

Now, as shown in FIG. 8A, while the joining device 1 is waiting at the retracted position, each of the leading steel plate S1 and the trailing steel plate S2 is conveyed to a predetermined position. Then, as shown in FIG. 6A, the leading steel plate S1 and the trailing steel plate S2 are sandwiched by the clamps 79 and 79, respectively, and are positioned several tens of millimeters below the height position of the steel plate S. It is fixed. When the fixing is completed, the joining device 1 starts moving on the outward route. On the outward route, the welded portion 20 and the pressed lower portion 30 are separated so as not to come into contact with the leading steel plate S1 and the trailing steel plate S2. Further, the supply of the cooling water from the cooling unit 40 is stopped, and the heating unit 50 is not yet in the heated state.

When the moving frame 10 of the joining device 1 advances the forward movement, the film removing portion 60 reaches the steel plate S (leading steel plate S1, trailing steel plate S2) as shown in FIGS. 6 (a) and 8 (b). Further, since it passes through the steel sheet S, the surface coating of the steel sheet S is removed.
When removing the surface coating, as shown in FIGS. 4 (b) and 6 (a), the pressing rolls 62A and 62B pressurize the tip of the steel sheet S from the front and back, so that the tip is tentatively undulated. Even if it is deformed by such means, the deformation is corrected at least during pressurization so that the relative positions of the brush rolls 61A and 61B and the steel plate S are kept constant between the pressing rolls 62A and 62B and in the vicinity thereof.

Further, when the joining device 1 advances the outward movement and reaches the forward position, the cut portion 90 reaches the steel plate S (leading steel plate S1, trailing steel plate S2) as shown in FIGS. 6 (b) and 8 (c). .. Next, the shear blade 91A is lowered and the shear blade 91B is raised to cut each of the leading steel plate S1 and the trailing steel plate S2.
Now that the procedure on the outward route is completed, the joining device 1 moves on the return route next. When the joining device 1 moves on the outward path, the welded portion 20 and the pressed lower portion 30 are prepared to come into contact with the leading steel plate S1 and the trailing steel plate S2, and cooling water is sprayed from the cooling portion 40.

When the joining device 1 starts moving on the return path, the steel plate S exits the cut portion 90 and then passes through the welded portion 20 and the compression lower portion 30 in order as shown in FIG. 9A. The leading steel plate S1 and the trailing steel plate S2 are welded as shown in FIG. 6 (c) by passing through the welded portion 20. Next, by passing through the compression lower portion 30, the welded portion is flattened to a wall thickness approximately the same as that of the other portions as shown in FIG. 6 (d).

As shown in FIG. 9B, the welded portion crushed by the compression lower portion 30 is rapidly cooled because the cooling water CW supplied as a mist adheres when it reaches the cooling portion 40. The welded portion is hardened by this quenching.

As the joining device 1 advances the movement of the return path, as shown in FIG. 9C, the steel plate S is heated to a predetermined temperature in the process of passing over the heating portion 50, so that the hardened welded portion is removed. It is tempered.
When the joining device 1 further advances the movement of the return path, the joining device 1 returns to the retracted position as shown in FIG. 9D, and a series of procedures for welding the leading steel plate S1 and the trailing steel plate S2 is completed. Then, the steel plate S in which the leading steel plate S1 and the trailing steel plate S2 are connected is conveyed to the next process.

[Effect]
Hereinafter, the effect of the joining device 1 according to the present embodiment will be described.
When the joining device 1 removes the surface coating, the pressing rolls 62A and 62B pressurize the steel plate S from the front and back sides. Therefore, even if the steel plate S to be joined is deformed due to undulation or the like, the pressing force during pressurization Deformation is eliminated at the site. As a result, the relative position of the steel plate S with respect to the brush rolls 61A and 61B can be kept constant. Here, with a soft abrasive such as the brush rolls 61A and 61B, even if the brush rolls 61A and 61B are pressed against the steel plate S, the deformation cannot be eliminated, but by providing the presser rolls 62A and 62B, Since the relative position of the steel plate S with respect to the brush rolls 61A and 61B can be kept constant, the reaction force from the steel plate S applied to the brush rolls 61A and 61B becomes uniform, and the surface coating can be stably removed.

Further, the joining device 1 uses pressing rolls 62A and 62B which are rotating bodies to hold the steel plate S from the front and back, and since the rotating body idles, it rotates following the movement of the contacting steel plate S. Therefore, it is possible to reduce the load received by the pressing rolls 62A and 62B from the steel plate S as the steel plate S moves. Further, since a drive source for rotating the presser rolls 62A and 62B is not required, the space occupied by the joining device 1 can be reduced and the cost can be reduced.

Further, in the joining device 1, the brush rolls 61A and 61B and the pressing rolls 62A and 62B are arranged coaxially with the spindles 63A and 63B. Therefore, since the brush rolls 61A and 61B and the presser rolls 62A and 62B can be raised and lowered by one hydraulic cylinder 65A and 65B, respectively, the space occupied by the joining device 1 can be reduced and the cost can be reduced.

Although the preferred embodiments of the present invention have been described above, the configurations listed in the above embodiments can be selected or replaced with other configurations as long as the gist of the present invention is not deviated. Some examples are shown below.

[Positioning of presser rolls 62A and 62B]
In the present invention, as shown in FIG. 10, the positions of the presser roll 62A and the presser roll 62B can be shifted in the transport direction DS (length direction L) of the steel plate S. Moreover, the height of the lowest point of the presser roll 62A located on the upper side is set to be equal to or lower than the height of the highest point of the presser roll 62B located on the lower side. That is, the pressing position of the pressing roll 62A on the front side of the steel plate S exceeds the height position PL of the steel plate S (below the upper surface US of the steel plate S), and the pressing position of the pressing roll 62B on the back side of the steel plate S is the steel plate. It is arranged beyond the height position PL of S (above the lower surface LS of the steel plate S). The upper surface US and the lower surface LS are assumed to be the upper surface and the lower surface of the steel plate S when the flat steel plate S is conveyed and sandwiched and fixed by the clamp 79. Further, the reduction position is defined at the lower end of the presser roll 62A and at the upper end of the presser roll 62B.
As shown in FIG. 10, it is assumed that the brush rolls 61A and 61B are arranged coaxially with the presser rolls 62A and 62B.

By arranging the pressing rolls 62A and 62B as described above, the ability to remove the surface coating against deformation can be improved as described below.
When the steel plate S passes between the pressing rolls 62A and 62B arranged as described above, as shown in FIG. 10, the steel plate S has a curved range in contact with each of the pressing roll 62A and the pressing roll 62B. Therefore, the ability to remove the surface coating is improved by increasing the area in contact with the brush rolls 61A and 61B as compared with the above-described embodiment in which the flat FL is used. This effect is premised on the brush rolls 61A and 61B and the presser rolls 62A and 62B being arranged coaxially.

Further, as shown in FIGS. 11A to 11C, the steel plate S may undulate and deform between the brush rolls 61A and 61B and the clamps 79 and 79. In this case, the degree to which the surface coating can be removed is determined by the size of the portion where the steel plate S and the brush rolls 61A and 61B overlap. That is, in FIG. 11A, since the portion where the steel plate S overlaps with the brush roll 61B is narrow, the removal of the surface coating on this portion may be insufficient. Note that FIG. 11 shows only the tip portions of the brush rolls 61A and 61B and the presser rolls 62A and 62B in the AA cross section, the BB cross section and the CC cross section of FIG. Further, FIG. 11 shows an example in which the steel plate S has a swell that protrudes upward, but when the steel plate S has a swell that protrudes downward, the vertical direction is reversed from that shown in FIG. Shows behavior. Further, in FIGS. 11 (a) to 11 (c), two broken lines extending in the horizontal direction in the figure indicate the height position PL, respectively.

With respect to the above, as shown in FIG. 10, the pressing rolls 62A and 62B are arranged so as to be displaced from each other. Then, the contact state between the brush rolls 61A and 61B and the steel plate S is changed by changing the position of the steel plate S up and down around the height position PL which is the reference height of the steel plate S fixed by the clamp 79. Can be kept constant. The height position PL indicates the center of the arranged steel sheet S in the thickness direction and exists over the length direction L. Specifically, as shown in FIG. 11B, when the presser roll 62B on the back side is moved above the back surface (lower surface) of the steel plate S arranged at the height position PL, the presser roll 62B moves upward. For the curved steel plate S, the regions overlapping the brush rolls 61A and 61B are balanced. Similarly, as shown in FIG. 11C, the presser roll 62A on the front side is moved below the surface (upper surface) of the steel plate S arranged at the height position PL, and is curved downward by the presser roll 62A. Also in the steel sheet S, the regions overlapping the brush rolls 61A and 61B are balanced. This makes it easier to form a portion in which the brush rolls 61A and 61B are in contact with the steel plate S in parallel with the steel plate S. Therefore, the surface coatings on the front and back surfaces of the steel sheet S can be removed evenly.
Even if the steel plate S is curved by only one of the presser roll 62A on the front side and the presser roll 62B on the back side, the area of contact with the brush rolls 61A and 61B is increased as compared with the above-described embodiment. Can be done.

[Brush rolls 61A and 61B for wear]
The brush rolls 61A and 61B wear in proportion to the time for removing the surface coating of the steel plate S. As the amount of wear increases, the brush rolls 61A and 61B become shorter and smaller in diameter, and cannot come into contact with the steel plate S with a force necessary for removing the surface coating. The diameters of the pressing rolls 62A and 62B can be reduced in response to the wear of the brush rolls 61A and 61B. As means for reducing the diameter of the presser rolls 62A and 62B, there are the following first to fourth means.

First means: Cutting the presser rolls 62A and 62B The first means is to cut the surface of the presser rolls 62A and 62B. An example thereof will be described with reference to FIG.
In the first means, as shown in FIG. 12, a tool for cutting the tip surfaces of the presser rolls 62A and 62B, for example, a cutting tool 81 called a knurl cutter or a knurl cutter is opposed to the tip surfaces of the presser rolls 62A and 62B. And provide. Normally, the cutting tool 81 is separated from the tip surfaces of the presser rolls 62A and 62B as shown in FIGS. 12A and 12B.
As shown in FIG. 12, the first means includes a sensor for detecting wear of the brush roll 61A, for example, a photoelectric sensor 83, and the photoelectric sensor 83 includes a light emitting element 83A and a light receiving element 83B as an example. .. As shown in FIG. 12A, in the light emitting element 83A and the light receiving element 83B, when the brush roll 61A is less worn, the inspection light DL from the light emitting element 83A is blocked by the brush roll 61A, so that the light receiving element 83B becomes The inspection light DL cannot be received. However, when the wear of the brush roll 61A increases, for example, when the tip surface of the brush roll 61A becomes the same height as the tip surface of the presser roll 62A, as shown in FIG. 12B, the inspection light from the light emitting element 83A Since the DL passes through the brush roll 61A, the light receiving element 83B receives the inspection light DL.

Then, the received inspection light DL becomes a signal for starting cutting, and as shown in FIG. 12D, the cutting tool 81 descends so as to come into contact with the tip surface of the brush roll 61A and cuts the tip surface. When the predetermined amount of cutting is completed, the cutting tool 81 is raised to the same position as before.
After that, as shown in FIG. 12C, the position of the photoelectric sensor 83 is lowered more than before to detect the wear of the brush roll 61A.
Instead of the photoelectric sensor 83, a sensor for measuring the amount of wear may be provided, and cutting may be started when the measured amount of wear reaches a predetermined value.

The above series of procedures can be performed in the process of removing the surface coating with the brush rolls 61A and 61B. In this case, when the pressing roll 62A is cut by the cutting tool 81, the work of removing the surface coating is temporarily interrupted.

In order to cut the presser rolls 62A and 62B with the cutting tool 81, it is necessary to stop the presser rolls 62A and 62B from rotating. Therefore, for example, a mechanism that allows rotation in one direction but prevents rotation in the opposite direction, for example, a ratchet, can be interposed between the presser rolls 62A and 62B and the spindles 63A and 63B. Cutting is performed with the cutting tool 81 while being rotationally driven by the driving force from the motors 66A and 66B in the direction in which the rotation is stopped.
In addition to the ratchet, a key groove is provided between the presser rolls 62A and 62B and the spindles 63A and 63B, and when cutting the presser rolls 62A and 62B, a key is inserted into this key groove to insert the presser rolls 62A and 62B. Can stop the rotation of. When operating the joining device 1, the key is removed from the keyway.

The cutting amount of the presser rolls 62A and 62B can be controlled as follows, for example.
As shown in FIG. 12, a contact sensor 84 that moves in synchronization with the cutting tool 81 is provided, and when the contact sensor 84 comes into contact with the brush rolls 61A and 61B, cutting by the cutting tool 81 is completed.

Second means: Multiple layers of presser rolls 62A and 62B In the second means, the presser rolls 62A and 62B are composed of a plurality of members, and the member corresponding to the outermost layer is removed according to the wear of the brush rolls 61A and 61B. That is.
As an example thereof, as shown in FIG. 13A, the pressing roll 62A (62B) is provided with a disc-shaped first member 62A1 and an annular second member 62A2 fitted on the outer circumference of the first member 62A1. Consists of ,. When the amount of wear of the brush rolls 61A and 61B increases, the second member 62A2, which is the outermost layer, is removed to form the pressing roll 62A (62B) from only the first member 62A1. Here, an example in which the presser roll 62A (62B) has a two-layer structure is shown, but a structure having three or more layers is also possible.

Third means: Replacing the presser rolls 62A and 62B The third means is to replace the presser rolls 62A and 62B with one having a smaller diameter.
As an example, as shown in FIG. 13B, the presser roll 62A (62B) having a radius R1 was initially used, but when the amount of wear of the brush roll 61A (61B) increases, the radius R2 ( Replace with the presser roll 62A (62B) of R1> R2). After that, similarly, when the amount of wear increases, the presser roll 62A (62B) having a smaller diameter can be replaced.

Fourth means: Changing the positions of the pressing rolls 62A and 62B The fourth means is to change the positions of the pressing rolls 62A and 62B with respect to the steel plate S.
As an example thereof, as shown in FIG. 13 (c), the brush roll 61A (61B) and the presser roll 62A (62B) are initially arranged coaxially (left side of FIG. 13 (c)). However, when the amount of wear of the brush roll 61A (61B) increases, the position of the rotation shaft C61 of the brush roll 61A (61B) is lowered from the rotation shaft C62 (right side of FIG. 13C).
The fourth means is based on the premise that the presser rolls 62A and 62B can move up and down independently of the brush rolls 61A and 61B.

[Alternative means of presser rolls 62A and 62B]
In the joining device 1, the pressing rolls 62A and 62B are used to correct the deformation of the steel plate S, but the pressurizing body in the present invention is arbitrary as long as the deformation of the steel plate S can be corrected.
As an example, as shown in FIG. 14, track 85 can be used. The track 85 includes a pair of floating wheels 85A, a plurality of rolling wheels 85B arranged between the pair of floating wheels 85A, and endless crawler belts 85C surrounding the floating wheels 85A and the rolling wheels 85B. .. The endless track 85 rotates as the steel plate S is conveyed without requiring a driving force.
The track 85 can have a wider range in which the deformation of the steel plate S can be corrected as compared with the pressing rolls 62A and 62B.

[Type of joining device]
In the above embodiments, the joining device 1 for performing mash seam welding has been described as an example, but the joining method to which the present invention is applied is not limited to this. It can be widely applied to a joining method in which a surface coating needs to be removed when the ends of a pair of steel plates S and other metal plates are overlapped and joined. As a specific example, Friction Stir Welding (FSW) is applicable.

1 Joining device 10 Moving frame 11A Connection end 11B Opening 12A, 12B Support base 13 Wheel 14 Bottom surface 20 Welding part 21A, 21B Electrode ring 22A, 22B Support rod 23 Hydraulic cylinder 24 Piston 30 Pressure lower part 31A, 31B Reduction roll 32A, 32B Support Rod 33 Hydraulic cylinder 34 Piston 40 Cooling part 41 Sprinkling nozzle 50 Heating part 51 Heater 60 Film removing part 61A, 61B Brush roll 62A, 62B Presser roll 63A, 63B Main shaft 64A, 64B Support bracket 65A, 65B Hydraulic cylinder 66A, 66B Motor 67A , 67B Output shaft 68A, 68B 1st pulley 69A, 69B 2nd pulley 71A, 71B 3rd pulley 72A, 72B 4th pulley 73A, 73B 1st conduction belt 74A, 74B 2nd conduction belt 75A, 75B Rotating shaft 76A, 76B Waterproof Cover 77A, 77B Waterproof Curtain 79,79 Clamp 81 Cutting Tool 83 Photoelectric Sensor 85 Infinite Orbit 90 Cutting Part 91A, 91B Shear Blade

Claims (15)

1. A pair of abrasives that remove the surface coating formed on the front and back of the object to be joined,
   A pair of pressurizing bodies for which the surface coating is removed by the pair of abrasives and the bonding object is sandwiched from the front and back and pressed while moving against the bonding object.
   A coating remover.
   
2. The abrasive and the pressurizing body consist of a rotating body supported by a common rotating shaft.
   The film removing device according to claim 1.
   
3. The abrasive and the pressurizing body consist of a rotating body supported by a rotating shaft that can be raised and lowered independently.
   The film removing device according to claim 1.
   
4. The abrasive and the pressurizing body arranged on the front side of the joining target and the grinding material and the pressurizing body arranged on the back side of the joining target are
   When the respective rotation axes are arranged so as to be offset in the horizontal direction and the film is removed,
   The height of the lowest point of the pressurizing body on the front side is arranged to be equal to or lower than the height of the highest point of the pressurizing body on the back side.
   The film removing device according to claim 2.
   
5. A cutting tool that cuts the outer circumference of the pressurizing body made of a rotating body,
   A wear amount sensor for detecting that the wear amount of the abrasive has reached a predetermined value is provided.
   The cutting tool cuts the pressurizing body based on the detection result of the wear amount sensor.
   The film removing device according to claim 2 or 4.
   
6. The abrasive is rotationally driven by a drive source.
   The pressurizing body idles,
   The film removing device according to any one of claims 2 to 5.
   
7. This is a method of removing the surface coating formed on the front and back surfaces of the object to be joined by a pair of abrasives provided on the front and back surfaces.
   A pair of pressurizing bodies provided on each of the front and back surfaces sandwiches the bonding object from the front and back surfaces, pressurizes the bonding object while moving, and removes the surface coating with the pair of abrasives.
   Film removal method.
   
8. The abrasive and the pressurizing body are made of a rotating body.
   The pressurizing body follows the relative movement of the joining target and slips in the direction in which the joining target moves relatively.
   The film removing method according to claim 7.
   
9. The abrasive and the pressurizing body consist of a rotating body supported by a common rotating shaft.
   In the pressurizing body arranged on the front side of the joining target, the joining target is curved downward or
   In the pressurizing body arranged on the back side of the joining target, the joining target is curved upward.
   The film removing method according to claim 7 or 8.
   
10. The abrasive and the pressurizing body consist of a rotating body supported by a rotating shaft that can be raised and lowered independently.
    When the amount of wear of the abrasive reaches a predetermined value,
    The rotation axis of the pressurizing body arranged on the front side of the joining target is pulled up, and the rotation axis of the pressurizing body arranged on the back side of the joining target is pulled down.
    The film removing method according to claim 9.
    
11. When the amount of wear of the abrasive reaches a predetermined value,
    Replacing the pressurizing body made of a rotating body with the pressurizing body having a small diameter,
    The film removing method according to any one of claims 7 to 9.
    
12. The film removing device according to any one of claims 1 to 6.
    A joining device including a joining machine for joining the joining objects on which the surface coating is removed and superposed.
    
13. The joining machine is
    A pair of electrode rings in which the surface coating is removed and the overlapped objects are sandwiched from the front and back and welded,
    It includes a pair of pressure rolls that sandwich the welded part from the front and back and reduce it.
    The joining device according to claim 12.
    
14. A joining method comprising a joining step of joining the joining objects in which the surface coating is removed and overlapped by the coating removal method according to any one of claims 7 to 10.
    
15. The joining step is
    A welding step in which the surface coating is removed and the superposed joint objects are sandwiched between front and back surfaces by a pair of electrode rings and welded.
    It is provided with a reduction step in which the welded portion is sandwiched between the front and back sides with a pair of pressure rolls and reduced.
    The joining method according to claim 14.

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