JP7205395B2 - welding machine - Google Patents

Description

The present application relates to a welding machine for joining steel sheets.

In a welding machine, the edge to be welded of the steel plate may be cut by a shear before welding. If the ends are not cut properly, the quality of the weld can be compromised. Therefore, in the field of such welding machines, various techniques for cutting steel plates have been proposed in order to improve the quality of welds. For example, Patent Literature 1 discloses a monitoring method and apparatus for measuring the amount of deviation of an actual cutting line from a cutting reference line in the longitudinal direction of a steel plate. This machine has a double cut shear device with an upper shear and a lower shear. When cutting the edge of the steel plate, the lower shear is raised to the lower surface of the steel plate and the upper shear is lowered. In the monitoring method of Patent Document 1, when the lower shear is raised, the amount of deviation of the actual cutting line from the cutting reference line is detected, and the quality of the welded portion is determined based on this amount of deviation.

JP 2007-203327 A

In the welding machine as described above, the steel plate is generally held by a clamping device during cutting. If the steel plate is not properly held, the force from the cutting shear can cause the steel plate to move, causing the actual cutting position to deviate from the desired cutting position. In this case, the steel plates may not be properly joined in the welding process. Therefore, if the actual cutting position deviates from the desired cutting position, the operator must manually adjust the position of the steel plate before welding. In order to avoid such work, the steel plate must be properly held by the clamping device.

In order to hold the steel plate appropriately, it is preferable to form a surface pressure distribution in the region of the steel plate pressed by the clamp device so that a high pressure is obtained in a region as close as possible to the cutting position. In this case, the clamping device can hold the steel plate firmly against the force from the cutting shear. At the same time, in order to hold the steel plate appropriately, it is preferable to press the steel plate uniformly in the width direction by the clamping device in the region near the cutting position. In this case, it is possible to prevent local excessive surface pressure from being applied to the steel plate from the clamping device.

Accordingly, an object of the present disclosure is to provide a welding machine capable of making the surface pressure applied to a region closer to the cutting position of the steel plate higher than the surface pressure applied to a region distant from the cutting position of the steel plate. and A further object of the present disclosure is to provide a welder capable of uniformizing the surface pressure applied to a region closer to the cutting position of the steel plate in the width direction.

One aspect of the present disclosure is a welding machine for joining a pair of steel plates, comprising a cutting shear for cutting opposing edges of the pair of steel plates and a pair of clamp devices for holding the pair of steel plates. and joining means for joining cut edges of the pair of steel plates, each of the pair of clamping devices proximate a cutting shear. a front end that is the side end and a rear end that is the end that is remote from the cutting shear, and has an upper clamp and a lower clamp for clamping the steel plate, the upper clamp and the lower Each of the clamps has a body and a ridge that presses against the steel plate, the ridge being attached to the body at its distal end, and in each of the pair of clamping devices, at least one of the upper clamp and the lower clamp. either one is a welder having a spacer between the body and the ridge, the spacer being located in a region near the tip and forming a gap in a region remote from the tip. .

In the welder of the present disclosure, the steel plate is held by the ridges of the upper and lower clamps. At least one of the upper clamp and the lower clamp also has a spacer between the body and the ridge that forms a gap in a region remote from the tip. Therefore, in the region near the tip (the region where no gap is provided), the pressing force from the main body is directly transmitted to the steel plate through the spacer without passing through the gap, while the region far from the tip (the region where the gap is provided) is directly transmitted to the steel plate. ), the pressing force from the main body bypasses the gap and is indirectly transmitted to the steel plate via the spacer. Therefore, a higher contact pressure can be obtained in a region near the tip (that is, a region closer to the cutting position of the steel plate). Therefore, the surface pressure applied to the region closer to the cutting position of the steel plate can be made higher than the surface pressure applied to the region distant from the cutting position of the steel plate.

The spacer may be formed as a separate liner from the body and ridges. In this case, for example, when the ridges wear due to use, the worn ridges can be sufficiently pressed against the steel plate by replacing the spacer with a thicker liner. Therefore, the ridge can be used for a long period of time.

The spacer may be split into a plurality of split spacers in the width direction of the steel plate. In this case, for example, by using a plurality of split spacers with different thicknesses, the surface pressure distribution between the ridge and the steel plate can be adjusted in the width direction. Therefore, the surface pressure applied to the region closer to the cutting position of the steel plate can be made uniform in the width direction.

The welding machine may further include a pair of clamp cylinders for raising or lowering the upper clamp or the lower clamp, and the pair of clamp cylinders are connected to both ends of the upper clamp or the lower clamp in the width direction of the steel plate. The spacer may be the thickest in the central portion in the width direction of the steel plate. In this aspect, the clamp cylinders are arranged on both sides of the clamp device in the width direction of the steel plate. In this case, the force from the clamp cylinder concentrates on both ends of the steel plate, and the surface pressure distribution between the ridge and the steel plate tends to be low at the central portion in the width direction of the steel plate. In this aspect, since the spacer is thickest in the central portion, the surface pressure applied to the region closer to the cutting position of the steel plate can be made uniform in the width direction.

The joining means may be laser joining means. In laser joining means, high butt accuracy of steel plates is required in welding. According to the welding machine of this aspect, since the steel plate can be held appropriately, it is possible to obtain high butting accuracy of the steel plate. Thus, for example, manual positioning of the steel sheets by the operator before laser welding can be avoided.

According to one aspect of the present disclosure, the surface pressure applied to the region closer to the cutting position of the steel plate can be made higher than the surface pressure applied to the region distant from the cutting position of the steel plate. Further, according to a further aspect of the present disclosure, the surface pressure applied to the region closer to the cutting position of the steel plate can be made uniform in the width direction.

1 is a schematic front view showing a welding machine according to an embodiment; FIG. FIG. 4 is a schematic enlarged front view showing the tip of the clamp device in the cutting process; FIG. 5 is a schematic enlarged front view showing the tip of the clamping device in the welding process; FIG. 4(a) is a schematic enlarged perspective view showing the tip of the clamp device, and FIG. 4(b) is a view viewed from the x direction in FIG. 4(a). FIG. 11 is a schematic enlarged front view showing the tip of a clamping device of a welding machine according to another embodiment; FIG. 11 is a schematic enlarged front view showing the tip of a clamping device of a welding machine according to another embodiment; FIG. 7(a) is a schematic enlarged perspective view showing the tip of a clamping device of a welding machine according to another embodiment, and FIG. 7(b) is an arrow view seen from the x direction in FIG. It is a diagram. 8(a) is a schematic enlarged perspective view showing the use of multiple liners with different thicknesses in the clamping device of FIG. 7, and FIG. It is an arrow view. FIG. 5 is a schematic enlarged front view showing the tip of a clamp device in a cutting process of a conventional welding machine;

A welding machine according to an embodiment will be described below with reference to the accompanying drawings. Similar or corresponding elements are denoted by the same reference numerals, and overlapping descriptions are omitted. Figures may be scaled for ease of understanding. The directional terms "left" and "right" refer to the directions in the figures and are not intended to limit the particular orientation of the welder and its components.

FIG. 1 is a schematic front view showing a welding machine according to an embodiment, FIG. 2 is a schematic enlarged front view showing the tip of a clamping device in a cutting process, and FIG. 3 is a clamping part in a welding process. Fig. 3 is a schematic enlarged front view showing the tip of the device;

Referring to FIG. 2, welder 100 is configured to weld a pair of steel plates S1 and S2 that are sequentially conveyed along conveying line L1. Regarding the directions of the steel plates S1 and S2, the direction along the transport line L1 is the longitudinal direction, and the horizontal direction perpendicular to the transport line L1 (the direction perpendicular to the paper surface in FIG. 2) is the width direction. In the welding machine 100, the opposite ends of the pair of steel plates S1 and S2 are welded together in the longitudinal direction, thereby joining a plurality of continuous steel plates in the longitudinal direction.

A welding machine 100 includes a cutting shear 10 and a pair of clamping devices 20R and 20L. The cutting shears 10 are configured to cut opposite edges of the steel plates S1, S2. The cutting shear 10 can be arranged, for example, on the reference line L2. The cutting shear 10 can be, for example, a double cutting shear that simultaneously cuts the edges of the pair of steel plates S1 and S2. Specifically, the cutting shear 10 has an upper shear 11 and a lower shear 12 . The upper shear 11 and the lower shear 12 are installed on a common base. At least one of the upper shear 11 and the lower shear 12 is configured to be raised and lowered such that the upper shear 11 and the lower shear 12 move toward and away from each other. The upper shear 11 includes a first upper blade 11R for cutting one steel plate S1 and a second upper blade 11L for cutting the other steel plate S2. Similarly, the lower shear 12 includes a first lower blade 12R for cutting one steel plate S1 and a second lower blade 12L for cutting the other steel plate S2. By moving at least one of the upper shear 11 and the lower shear 12 closer to each other, the edge of the steel plate S1 held by the clamping device 20R is moved to the first upper blade 11R and the first lower blade 12R. At the same time, the edge of the steel plate S2 held by the clamp device 20L is cut by the second upper blade 11L and the second lower blade 12L. The upper shear 11 and the lower shear 12 are arranged above and below the steel plates S1 and S2 in the cutting process, and are movable so as to stand by at different locations in other processes.

Referring to FIG. 1, clamp devices 20R and 20L are configured to hold steel plates S1 and S2, respectively. The clamping devices 20R, 20L can be arranged symmetrically along the transport line L1, for example, about the reference line L2. Regarding the direction of the clamping devices 20R, 20L and their components, the end closer to the cutting shear 10 (reference line L2) is the leading end, and the end farther from the cutting shear 10 is the trailing end. For example, in FIG. 1, in the right clamp device 20R, the right end is the rear end and the left end is the front end. In contrast, for the left clamping device 20L, the right end is the leading end and the left end is the trailing end.

Each of the clamping devices 20R, 20L has an upper clamp 50, a lower clamp 60, and a plurality (for example, a pair) of clamp cylinders 70 arranged along the width direction. Note that FIG. 1 shows only one of the plurality of clamp cylinders 70 arranged along the width direction.

The upper clamp 50 and the lower clamp 60 are configured to sandwich the steel plates S1 and S2. Specifically, the upper clamp 50 includes a body 51 , a leading ridge 52 and a trailing ridge 53 . Similarly, lower clamp 60 includes body 61 , leading ridge 62 and trailing ridge 63 . The ridges 52, 53, 62, 63 can be formed of various wear-resistant materials, such as alloys containing vanadium or manganese, for example. The ridges 52, 53, 62, 63 may be attached to the bodies 51, 61 by fastening means such as bolts.

Clamp cylinder 70 can be coupled to body 51 to, for example, raise or lower upper clamp 50 . A pair of clamp cylinders 70 are connected to both ends of the main body 51 in the width direction. In addition, the clamp cylinder 70 is arranged substantially in the central portion of the main body 51 in the longitudinal direction. By lowering the upper clamp 50 by means of the clamp cylinder 70, the ridges 52, 53, 62, 63 press against the steel plates S1, S2. With such a configuration, each of the steel plates S1 and S2 is sandwiched at two points by the ridges 52 and 62 at the leading ends and the ridges 53 and 63 at the trailing ends.

Referring to FIG. 3, welder 100 further includes joining means 30 and a pair of support rolls 40R and 40L. The joining means 30 can be, for example, a laser joining means. A laser beam La emitted from the joining means 30 irradiates the butted edges of the steel plates S1 and S2, thereby joining the edges of the steel plates S1 and S2. If there is a gap between the edges of the steel plates S1, S2 that is larger than the diameter of the laser La, the steel plates S1, S2 may not weld properly. Therefore, especially when the joining means 30 is a laser joining means, it is necessary to cut the edges of the steel plates S1 and S2 with high accuracy in the cutting step in order to obtain high butting accuracy of the steel plates S1 and S2. be. In order to guide the laser La from the joining means 30 to the welding position, one or more optical elements such as mirrors may be appropriately arranged between the joining means 30 and the welding position.

The support rolls 40R, 40L are configured to additionally hold the steel plates S1, S2 near the butted edges in the longitudinal direction between the clamping devices 20L, 20R during laser welding. Each of the support rolls 40R, 40L has an upper roll 41 and a lower roll 42 configured to sandwich the steel plates S1, S2. The upper roll 41 and the lower roll 42 are arranged above and below the steel plates S1 and S2 in the welding process, and are movable so as to stand by at different locations in other processes.

Next, the tip ridge 52 will be described in detail.

Referring to FIG. 2 , in upper clamp 50 , ridge 52 at the tip is attached to body 51 via spacer 54 . The spacer 54 is arranged in a region near the tip 51a of the main body 51. As shown in FIG. Specifically, for example, the spacer 54 extends from the tip of the overlapping region A1 (in this embodiment, the tip 51a of the main body 51) to the steel plates S1 and S2 in the overlapping region A1 between the main body 51 and the ridge 52 in the longitudinal direction. It extends longitudinally toward the trailing end for a predetermined distance (eg, about half the length of the overlap region A1). In addition, as shown in FIG. 2, the spacer 54 may protrude from the tip of the overlapping area A1 to the outside of the overlapping area A1. Also, in contrast, spacer 54 may extend a predetermined distance from a position remote from the leading edge of overlap region A1 toward the trailing edge. As a result, a gap G is formed between the main body 51 and the ridge 52 in a region away from the tip 51a of the main body 51 (the region from the rear end of the spacer 54 to the rear end of the overlapping region A1). As described below, the spacers 54 and the gaps G reduce the surface pressure applied to the regions closer to the cutting positions of the steel plates S1 and S2 to the surface pressure applied to the regions farther from the cutting positions of the steel plates S1 and S2. It has the advantage of being able to be higher than

FIG. 9 is a schematic enlarged front view showing the tip of the clamping device in the cutting process of the conventional welding machine. Conventional welder 500 differs from welder 100 described above in that upper clamp 50 does not have spacer 54 and gap G is not formed between body 51 and ridge 52 . Detail F shows the surface pressure distribution between the ridge 52 and the steel plates S1 and S2 in the conventional welding machine 500, where the horizontal axis indicates the position in the longitudinal direction and the vertical axis indicates the surface pressure. In welder 500 , a clamp cylinder (not shown in FIG. 9 ) is arranged substantially in the center of main body 51 in the longitudinal direction, similar to welder 100 . Therefore, the force from the clamp cylinder will be applied at the ridges 52, 53, 62, 63 more at positions closer to the clamp cylinder than at other positions. Thus, at tip ridge 52, the force from the clamping cylinder is exerted by a region of body 51 remote from tip 51a. Therefore, as shown in detail F, between the ridge 52 and the steel plates S1 and S2, a high surface pressure is obtained in a region away from the tip 51a (that is, a region away from the cutting position), It can be seen that the surface pressure is low in the near region. Therefore, in the conventional welding machine 500, the steel plates S1 and S2 may move due to the force from the cutting shear 10 because the ridge 52 cannot sufficiently press the steel plates S1 and S2 in the region near the cutting position. In this case, the actual cutting position deviates from the desired cutting position.

Referring to FIG. 2 , detail part E shows the surface pressure distribution between ridge 52 and steel plates S1 and S2 in welding machine 100 according to the present disclosure, where the horizontal axis indicates the position in the longitudinal direction and the vertical axis indicates the position. The axis indicates surface pressure. In the welder 100, a gap G is formed in a region away from the tip 51a between the tip ridge 52 and the main body 51, so that the force from the clamp cylinder 70 is applied to the gap G in the region away from the tip 51a. is indirectly transmitted to the steel plates S1 and S2 via the spacer 54, while the force from the clamp cylinder 70 passes through the gap G in the region near the tip 51a (that is, the region where the gap G is not provided). It is directly transmitted to the steel plates S1 and S2 via the spacer 54 without intervening. Therefore, as shown in detail E, the maximum contact pressure is obtained between the ridge 52 and the steel plate S2 at the position closest to the tip 51a (that is, the position closest to the cutting position). Therefore, in the welding machine 100, the ridge 52 can sufficiently press the steel plates S1 and S2 in the region near the cutting position. Further, the steel plate S2 is pressed by the entire surface of the ridge 52, and the surface pressure is distributed along the ridge 52.

In this embodiment, spacer 54 is formed as a separate liner from body 51 and ridge 52 . A spacer 54 formed as a liner is sandwiched between the body 51 and the ridge 52, and the body 51 and the ridge 52 are bolted together. In this embodiment, the bolts are used for fastening, but other fixing means may be used. A spacer 54 formed as a liner provides the following advantages. If the ridges 52, 62 (especially the lower ridge 62) wear due to the transport of the steel plates S1, S2, the clamping devices 20R, 20L may not be able to sufficiently press the ridges 52, 62 against the steel plates S1, S2. There is In this case, the clamp devices 20R and 20L cannot properly hold the steel plates S1 and S2, and the actual cutting position may deviate from the desired cutting position. However, if the spacer 54 is formed as a separate liner from the body 51 and ridges 52, replacing the spacer 54 with a thicker liner will adequately press the worn ridges 52, 62 against the steel plates S1, S2. can be done. Therefore, the steel plates S1, S2 can be properly held while the worn ridges 52, 62 are used, thereby allowing the ridges 52, 62 to be used for a long period of time.

The liner can be made of a variety of materials, such as metal (eg, stainless steel). The width w1 of the spacer 54 in the longitudinal direction of the steel plates S1, S2 is smaller than the width w2 of the ridge 52. As shown in FIG. The width w1 of the spacer 54 can be appropriately determined so that a high surface pressure can be obtained at a position near the tip 51a.

FIG. 4(a) is a schematic enlarged perspective view showing the tip of the clamping device, and FIG. 4(b) is a view viewed from the direction x in FIG. 4(a). As shown in FIG. 4B, in the present embodiment, the thickness t1 of the liner varies along the width direction of the steel plates S1 and S2 (horizontal direction in FIG. 4B). Thickest in the middle of the direction. The thickness t1 of the liner may be constant in the width direction of the steel plates S1 and S2. The thickness t1 of the liner, like the width w1, can be appropriately determined so that a high surface pressure is obtained in the region near the tip 51a. For example, the thickness t1 of the liner can be about 100 μm to 1000 μm, and the thickness t2 of the ridge 52 can be about 10 mm to 25 mm.

Next, the operation of welder 100 will be described.

As shown in FIG. 2, in welding machine 100, steel plates S1 and S2 are transported in the direction of arrow Ar along transport line L1. The steel plate S1 is held by the clamp device 20R so that the downstream end protrudes from the clamp device 20R. The steel plate S2 is held by the clamp device 20L so that the upstream end protrudes from the clamp device 20L. Subsequently, the cutting shear 10 is moved to the cutting position, and the cutting shear 10 simultaneously cuts the downstream edge of the steel plate S1 and the upstream edge of the steel plate S2. After cutting is completed, the cutting shear 10 returns to the standby position.

As shown in FIG. 3, the positions of the steel plates S1, S2 are then adjusted along the transport line L1 so that the cut edges of the steel plates S1, S2 abut each other. Subsequently, the support rolls 40R, 40L are moved to the holding position and the steel plates S1, S2 are held by the support rolls 40R, 40L in the vicinity of the butted edges. Subsequently, a laser La is irradiated from the joining means 30 toward the butted edges of the steel plates S1 and S2, and the edges of the steel plates S1 and S2 are welded. When welding is completed, the support rolls 40R, 40L return to their standby positions. A series of operation|movements are complete|finished by the above. The welded steel sheets may then be sent to other processes such as annealing.

In the welding machine 100 as described above, the steel plates S1 and S2 are held by the ridges 52 and 62 of the upper clamp 50 and the lower clamp 60 at the tips of the clamp devices 20R and 20L. The upper clamp 50 has a spacer 54 that forms a gap G between the main body 51 and the ridge 52 in a region away from the tip 51a of the main body 51 . Therefore, in the region near the tip 51a (that is, the region where the gap G is not provided), the pressing force from the main body 51 is directly transmitted to the steel plates S1 and S2 through the spacer 54 without passing through the gap G. , the pressing force from the main body 51 bypasses the gap G and is indirectly transmitted to the steel plates S1 and S2 via the spacer 54 in the area away from the tip 51a (that is, the area where the gap G is provided). Therefore, a high surface pressure is obtained in a region near the tip 51a (that is, a region nearer to the cutting position). Therefore, the surface pressure applied to the regions closer to the cutting positions of the steel plates S1 and S2 can be made higher than the surface pressure applied to the regions distant from the cutting positions of the steel plates S1 and S2.

Also, in welder 100 , spacer 54 is formed as a separate liner from main body 51 and ridge 52 . Thus, for example, when the ridges 52, 62 wear, replacing the spacer 54 with a thicker liner can sufficiently press the worn ridges 52, 62 against the steel plates S1, S2. Therefore, the ridges 52, 62 can be used for a long period of time.

The welding machine 100 further includes a pair of clamp cylinders 70 for raising or lowering the upper clamp 50. The pair of clamp cylinders 70 are connected to both ends of the upper clamp 50 in the width direction of the steel plates S1 and S2. The spacer 54 is the thickest in the central portion in the width direction of the steel plates S1 and S2. As described above, in the welding machine 100, the pair of clamp cylinders 70 are arranged on both sides of the clamp devices 20R, 20L in the width direction of the steel plates S1, S2. Therefore, the force from the clamp cylinder 70 concentrates on both sides, and the surface pressure distribution between the ridges 52, 62 and the steel plates S1, S2 tends to be low in the central portion. However, in the welder 100, since the spacer 54 is thickest in the central portion, the surface pressure applied to the regions closer to the cutting positions of the steel plates S1 and S2 can be made uniform in the width direction.

Moreover, in the welding machine 100, the joining means 30 is a laser irradiation device. As described above, the laser irradiation apparatus requires high butting accuracy of the steel plates S1 and S2 during welding. According to the welding machine 100, since the steel plates S1 and S2 can be held appropriately, it is possible to obtain high butting accuracy of the steel plates S1 and S2. Thus, for example, manual positioning of the steel plates S1, S2 by an operator before laser welding can be avoided.

Next, another embodiment will be described.

FIG. 5 is a schematic enlarged front view showing the tip of a clamp device of a welding machine according to another embodiment. Note that FIG. 5 shows only one clamping device 20L. This welder 200 differs from the welder 100 described above in that the spacer 54 is integrally formed with the main body 51 . In other respects, welder 200 is similar to welder 100 .

Also, FIG. 6 is a schematic enlarged front view showing the tip of a clamp device of a welding machine according to another embodiment. Note that FIG. 6 also shows only one clamping device 20L. This welder 300 differs from the welder 100 described above in that the spacer 54 is integrally formed with the ridge 52 . In other respects, welder 300 is similar to welder 100 .

In the welding machines 200 and 300 as described above, in the region near the tip 51a, the pressing force from the main body 51 is directly transmitted to the steel plate S2 through the spacer 54 without passing through the gap G, while the pressure from the tip 51a In the remote region, the pressing force from the main body 51 bypasses the gap G and is indirectly transmitted to the steel plate S2 via the spacer 54 . Therefore, a high surface pressure is obtained in a region near the tip 51a (that is, a region nearer to the cutting position). Therefore, the surface pressure applied to the regions closer to the cutting positions of the steel plates S1 and S2 can be made higher than the surface pressure applied to the regions distant from the cutting positions of the steel plates S1 and S2.

Next, (a) of FIG. 7 is a schematic enlarged perspective view showing the tip of a clamp device of a welding machine according to another embodiment, and (b) is an arrow view seen from the x direction in (a). It is a diagram. 8(a) is a schematic enlarged perspective view showing the use of a plurality of liners with different thicknesses in the clamping device of FIG. It is an arrow view.

Referring to FIG. 7, welder 400 differs from welder 100 in that spacer 54 is divided into a plurality of divided spacers 54a in the width direction of steel plates S1 and S2. Moreover, in the welding machine 400, the thickness t3 of the plurality of split spacers 54a is the same. In other respects, welder 400 is similar to welder 100 . The number of split spacers 54a can be appropriately determined according to various factors such as the size of the steel plates S1 and S2 and the welding machine 400. FIG.

In such a welding machine 400 as well, for the same reason as described above, the surface pressure applied to the region closer to the cutting position of the steel plates S1 and S2 is applied to the region farther from the cutting position of the steel plates S1 and S2. can be higher than pressure.

Moreover, in the welding machine 400, the spacer 54 is divided into a plurality of divided spacers 54a, so that a plurality of divided spacers 54a having different thicknesses can be used as shown in FIG. Therefore, for example, by using the dividing spacer 54a that is thicker in the central portion in the width direction, it is possible to cope with the tendency that the surface pressure distribution between the ridges 52, 62 and the steel plates S1, S2 as described above is low in the central portion. can be done. Further, for example, when the ridges 52, 62 wear due to use, a thick dividing spacer 54a is used in the portion where the wear is large to uniformly adjust the surface pressure distribution between the ridges 52, 62 and the steel plates S1, S2. can do. Therefore, the surface pressure applied to the regions closer to the cutting positions of the steel plates S1 and S2 can be made uniform in the width direction.

Although embodiments of a welder have been described, the invention is not limited to the embodiments described above. Those skilled in the art will appreciate that many variations of the above-described embodiments are possible. For example, in the embodiments described above, the spacers 54 are provided on the upper clamp 50 . Alternatively or additionally, spacers may be provided on the lower clamp 60 .

Further, for example, in the above embodiment, the case of the laser welding machine has been described, so the joining means 30 is a laser joining means. However, in other embodiments, for example in the case of a flash butt welder, the joining means 30 may be, for example, a pair of electrodes.

Further, for example, in the above-described embodiment, the cutting shear 10 is a double cutting shear that simultaneously cuts the edges of the pair of steel plates S1 and S2. However, in other embodiments, the cutting shears 10 may be of other types, such as, for example, two rotary shears for separately cutting a pair of steel plates S1, S2.

REFERENCE SIGNS LIST 10 cutting shear 11 upper shear 12 lower shear 20L, 20R clamp device 30 joining means 50 upper clamp 51 main body of upper clamp 51a tip of upper clamp 52 ridge at tip of upper clamp 54 spacer 54a split spacer 60 lower clamp 61 lower side Body of clamp 62 Ridge at tip of lower clamp 100, 200, 300, 400, 500 Welding machine G Gap S1, S2 Steel plate

Claims (5)

a cutting shear for cutting opposing edges of a pair of steel plates;
a pair of clamping devices for holding the pair of steel plates;
joining means for joining the cut edges of the pair of steel plates;
A welder for joining a pair of steel plates, comprising
Each of the pair of clamping devices has a front end, which is the end near the cutting shear, and a rear end, which is the end remote from the cutting shear, and clamps the steel plate. having upper and lower clamps of
each of the upper clamp and the lower clamp,
the main body;
a ridge that presses the steel plate;
has
the ridge is attached to the body at the tip;
In each of the pair of clamping devices, at least one of the upper clamp and the lower clamp has a spacer between the body and the ridge, the spacer in a region near the tip. forming a gap in a region remote from said tip. The welder of claim 1, wherein said spacer is formed as a separate liner from said body and said ridge. The welder according to claim 2, wherein the spacer is divided into a plurality of divided spacers in the width direction of the steel plate. further comprising a pair of clamp cylinders for raising or lowering the upper clamp or the lower clamp;
The pair of clamp cylinders are connected to both ends of the upper clamp or the lower clamp in the width direction of the steel plate,
The welder according to claim 2 or 3, wherein the spacer is thickest in the central portion in the width direction of the steel plate. The welder according to any one of claims 1 to 4, wherein said joining means is a laser irradiation device.

Images