JP7311743B2 - Surface processing equipment - Google Patents

Description

The present invention relates to a surface processing apparatus.

Conventionally, when an iron core is manufactured using an electromagnetic steel sheet (hereinafter also simply referred to as a steel sheet), it is possible to irradiate the surface of the steel sheet with a laser to form grooves before forming the iron core, thereby reducing the iron loss of the iron core. Are known. In general, when grooves are formed on the surface of a steel plate, the surface of the steel plate is irradiated with a laser. When a steel plate is irradiated with a laser, the steel plate instantly melts at the laser irradiation position, generating molten metal. After that, due to a sudden increase in pressure at the laser irradiation position, droplets of molten metal (hereinafter referred to as spatter) are scattered around, forming grooves on the surface of the steel plate.

When the grooves are formed on the surface of the steel sheet, if the spatter generated from the steel sheet scatters around, the scattered spatter may adhere to other surfaces of the steel sheet. If the steel sheet is coiled with the spatter still attached, the spatter will be caught between the steel sheets, causing surface defects.

In addition, when the spatter scatters around, there is a possibility that it may adhere to peripheral equipment such as a laser irradiation device. For example, if the spatter repeatedly adheres to the peripheral device, the spatter accumulates on the peripheral device and becomes a lump of metal. Such lumps of metal may drop onto the steel sheet and adhere to the surface of the steel sheet, causing flaws and other troubles in the same manner as described above.

Therefore, in order to solve such a problem, for example, in Patent Document 1, an assist gas is injected to the laser irradiation position almost parallel to the surface of the steel plate, and the assist gas blows off the spatter, thereby melting around the groove. It is disclosed to suppress the formation of metal protrusions.

Further, in Patent Document 2, a molten by-product (spatter) formed on the surface of the steel sheet by irradiating the surface of the steel sheet with a laser can be removed by air blowing or by suction. disclosed.

JP-A-2002-292484 Japanese Patent Publication No. 2015-510543

However, in Patent Document 1, the assist gas is injected to the laser irradiation position where the laser is irradiated, and the spatter generated at the laser irradiation position is simply forcibly blown away in the direction of the gas flow. There is a problem that the spatter that has been removed from the steel plate adheres to the surface of the steel plate again.

Moreover, in Patent Document 2, although spatters can be easily collected by installing a suction duct or the like, depending on the installation location of the suction duct, the spatter collides with a wall or the like in the suction duct and rebounds, causing the spatter to fly away. There is a problem that the spatter adheres to the surface of the steel plate again. Furthermore, even if the suction duct is installed on the surface of the steel plate, there is a gap between the suction duct and the steel plate. There is a problem that the spatters pass through the gap between them and adhere to the surface of the steel plate again.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above problems, and provides a surface processing apparatus capable of collecting spatter more reliably than the conventional one and suppressing adhesion of spatter to a steel plate.

The surface processing apparatus of the present invention includes a plurality of rollers for passing a steel plate, a laser irradiation device for processing the processing surface of the steel plate by irradiating the processing surface with a laser, and the laser for irradiating the steel plate with the laser. a gas injection device for injecting gas to a laser irradiation position and blowing off spatter generated from the processing surface at the laser irradiation position when the processing surface is processed by the laser; and the laser irradiation from the gas injection device. The steel plate is bent to the non-processed surface side not processed by the laser at the downstream side in the airflow direction of the gas from the laser irradiation position in the airflow direction in which the gas flows toward the position, and the steel plate at the laser irradiation position. A sheet threading direction changing roller for changing the sheet threading direction, and a sheet threading direction changing roller disposed on a linear extension of the sheet threading direction of the steel sheet at the laser irradiation position, and are moved along the steel sheet from the laser irradiation position by the gas. and a spatter recovery device for recovering the spatter that scatters.

According to the present invention, by changing the sheet threading direction of the steel sheet with the sheet threading direction changing roller, the spatter collecting device is moved to a position on the extension line linearly extended in the sheet threading direction from the laser irradiation position without interfering with the steel sheet. can be placed. Therefore, in the present invention, the spatter that scatters along the steel plate from the laser irradiation position can be recovered by the spatter recovery device, so that the spatter can be recovered more reliably than in the conventional art, and the adhesion of the spatter to the steel plate is suppressed. can.

1 is a schematic diagram showing the configuration of a surface processing apparatus according to a first embodiment; FIG. FIG. 2 is a partially enlarged view enlarging the periphery of a sheet threading direction changing roller in the surface processing apparatus of FIG. 1; 1 is a schematic diagram showing the configuration of a spatter recovery device; FIG. It is a schematic diagram showing the configuration of a surface processing apparatus according to a second embodiment. FIG. 5 is a partially enlarged view enlarging the periphery of a sheet threading direction changing roller in the surface processing apparatus of FIG. 4; It is a schematic diagram showing the configuration of a surface processing apparatus according to a third embodiment. 1 is a schematic diagram showing the configuration of a water jet type spatter recovery device; FIG.

An embodiment of the invention will be described in detail below with reference to the drawings. In the following description, similar elements are denoted by the same reference numerals, and overlapping descriptions are omitted.

(1) <First Embodiment>
(1-1) <Configuration of Surface Processing Apparatus According to First Embodiment>
FIG. 1 is a schematic diagram showing the overall configuration of a surface processing apparatus 1 according to the first embodiment. Here, as an example of a steel sheet whose surface is processed by the laser 3a by the surface processing apparatus 1, a grain-oriented electrical steel sheet having grooves formed on its surface will be described below as an example. Further, hereinafter, the front surface of the steel plate 7 processed by the laser 3a is referred to as a processed surface 7a, and the back surface of the steel plate 7 which is not processed by the laser 3a is referred to as a non-processed surface 7b.

A grain-oriented electrical steel sheet is a steel sheet in which the axis of easy magnetization of crystal grains (cubic (100) <001>) is substantially aligned in the rolling direction in the manufacturing process.

Such a grain-oriented electrical steel sheet is subjected to, for example, a casting process, a hot rolling process, an annealing process, a cold rolling process, a decarburization annealing process, an annealing separating agent coating process, a final annealing process, an insulating film forming process, and a laser irradiation process. It is manufactured through successive processes and an insulating film forming process. The surface processing apparatus 1 is used in a laser irradiation process to form grooves on the surface of a steel sheet 7 with a laser 3a. This laser irradiation process can also be performed after the cold rolling process, the decarburization annealing process, or the final finish annealing process. Since each of these steps is a well-known technique, the explanation thereof is omitted here.

As shown in FIG. 1, the surface processing apparatus 1 includes a plurality of rollers 9, a plate threading direction changing roller 5, a gas injection device 2, a laser irradiation device 3, a spatter recovery device 6, a dust collector 11, and a suction blower. 12. A plurality of rollers 9 are provided along a threading path along which the flat steel plate 7 is threaded, and thread the steel plate 7 in the threading directions x1 and x3 at a constant speed.

The laser irradiation device 3 converges and irradiates a laser 3a toward one side of the steel plate 7 being passed by the roller 9, scans in the width direction of the steel plate 7 perpendicular to the passing direction x1 of the steel plate 7, A groove is formed in the processing surface 7a of the steel plate 7 at the position where the laser 3a is irradiated (laser irradiation position). As a result, grooves extending in the width direction substantially orthogonal to the sheet passing direction x1 are formed in the processed surface 7a of the steel sheet 7 at predetermined intervals in the sheet passing direction x1.

In the first embodiment, the steel plate 7 is transversely passed by the rollers 9 arranged on the upstream side of the laser irradiation position O1 in the sheet passing direction. Accordingly, the sheet passing direction x1 of the steel sheet 7 at the laser irradiation position O1 is also the lateral direction. Here, the lateral direction includes not only the horizontal direction orthogonal to the vertical direction in which gravity acts, but also the direction inclined at a predetermined angle with respect to the horizontal direction.

The laser irradiation device 3 uses, for example, a fiber laser in which the fiber core is doped with Yb (ytterbium) as a laser medium to form grooves on the processing surface 7a of the steel plate 7 that is passed at a constant speed in the direction x1. do. Note that the laser irradiation device 3 is not limited to a fiber laser, and may be a device generally used for laser processing, such as a CO ₂ laser, a YAG laser, or a semiconductor laser.

The laser irradiation device 3 in the first embodiment is arranged above the steel plate 7 passing in the lateral direction by the roller 9, and emits the laser 3a from a direction perpendicular to the processing surface 7a of the steel plate 7 passing in the lateral direction. Irradiate. Here, the direction perpendicular to the processing surface 7a of the steel plate 7 includes not only the direction of the normal to the surface of the steel plate 7 at the laser irradiation position O1, but also the deviation due to the installation error of the roller 9, the laser irradiation device 3, or the like. .

The gas injection device 2 is arranged on the upstream side in the sheet threading direction from the laser irradiation position O1 in the sheet threading direction x1 (horizontal direction in FIG. 1) of the steel sheet 7 at the laser irradiation position O1. , the gas is jetted laterally along the processing surface 7a of the steel plate 7 toward the laser irradiation position O1. The gas injection device 2 blows off the spatter generated from the steel plate 7 at the laser irradiation position O1 downstream of the laser irradiation position O1 in the airflow direction 8 in which the gas flows from the lateral direction toward the laser irradiation position O1.

In addition to this configuration, the surface processing apparatus 1 is provided with a sheet passing direction changing roller 5 downstream of the laser irradiation position O1 in the airflow direction 8 in which the gas flows toward the laser irradiation position O1. . The sheet threading direction changing roller 5 bends the steel sheet 7 toward the non-processed surface 7b on the downstream side of the laser irradiation position O1 in the airflow direction, and changes the sheet threading direction x1 of the steel sheet 7 at the laser irradiation position O1. In FIG. 1 , the threading direction of the steel sheet 7 at the laser irradiation position O1 is x1, and the threading direction of the steel sheet 7 changed by the threading direction changing roller 5 is x2.

The sheet threading direction changing roller 5 is formed, for example, in a columnar shape, and is arranged on the side of the non-processed surface 7b of the steel sheet 7 that is not irradiated with the laser 3a. Thread the board while bending it. As a result, the sheet threading direction changing roller 5 changes the sheet threading direction x1 of the steel sheet 7 at the laser irradiation position O1 to the sheet threading direction x2 toward the non-processed surface 7b side. Here, in the first embodiment, the downward direction is shown as an example of the sheet threading direction x2 changed by the sheet threading direction changing roller 5 .

In addition, the roller 9 provided downstream of the sheet threading direction changing roller 5 has its curved surface brought into contact with the grooved processed surface 7a of the steel sheet 7, and is directed downward by the sheet threading direction changing roller 5. The threaded steel plate 7 is again threaded laterally along the curved surface. x3 shown in FIG. 1 indicates the direction in which the steel sheet 7 passed through the sheet threading direction changing roller 5 is changed by the roller 9 located downstream of the sheet threading direction changing roller 5 in the sheet threading direction.

The sheet threading direction changing roller 5 bends the sheet threading direction x1 of the steel sheet 7 at the laser irradiation position O1 to a different sheet threading direction x2 by bending it toward the non-processed surface 7b side, and changes the gas blown to the laser irradiation position O1. An installation space in which the spatter recovery device 6 can be installed without interfering with the steel plate 7 is formed on the downstream side in the airflow direction.

The spatter collecting device 6 is installed in an installation space formed by changing the sheet threading direction x1 of the steel sheet 7 by the sheet threading direction changing roller 5 in this manner. Thereby, the spatter collecting device 6 can be arranged in the vicinity of the laser irradiation position O1 without interfering with the steel plate 7 .

Here, the gas injection device 2 strongly blows the gas laterally to the laser irradiation position O1. Therefore, the gas that is blown laterally to the laser irradiation position O1 does not form an air flow along the steel plate 7 that is bent downward by the sheet threading direction changing roller 5, and is mostly The steel sheet 7 flows in the lateral direction linearly along the sheet-passing direction x1 of the steel sheet 7 at . As a result, the spatter generated from the steel plate 7 at the laser irradiation position O1 is blown off toward the spatter recovery device 6 located downstream in the airflow direction.

In this case, a suction blower 12 and a dust collector 11 are connected to the spatter recovery device 6 via a ventilation duct 10 . By driving the suction blower 12 , the spatter collecting device 6 sucks gas around the opening and takes it into the dust collector 11 through the ventilation duct 10 . The dust collector 11 collects spatters and the like contained in the taken gas, and then makes the suction blower 12 take the gas from which the spatter and the like are removed via the ventilation duct 10 .

As a result, the surface processing apparatus 1 arranges the spatter blown off along the processing surface 7a of the steel sheet 7 by the gas downstream in the airflow direction of the gas that flows linearly laterally from the laser irradiation position O1. 6 can be recovered.

Next, in the surface processing apparatus 1 shown in FIG. 1, a configuration for collecting spatter generated on the processing surface 7a by the spatter collecting apparatus 6 will be described in detail. FIG. 2 is a partially enlarged view of the periphery of the threading direction changing roller 5 in the surface processing apparatus 1 shown in FIG. As shown in FIG. 2, the laser 3a emitted from the laser irradiation device 3 is irradiated vertically onto the processing surface 7a of the steel plate 7, and the laser 3a forms grooves in the processing surface 7a of the steel plate 7. As shown in FIG.

The gas injection device 2 has a nozzle for injecting gas toward the steel plate 7, and the airflow direction 8 in which the gas flows from the nozzle toward the laser irradiation position O1 is a horizontal direction substantially perpendicular to the optical axis 3b of the laser 3a. direction is selected. Further, the nozzle of the gas injection device 2 is arranged near the surface of the steel plate 7, and sprays the gas in the lateral direction along the processing surface 7a of the steel plate 7 at the laser irradiation position O1.

As a result, the gas injection device 2 ejects the spatter generated when grooves are formed on the processing surface 7a of the steel plate 7 by the laser 3a at the laser irradiation position O1 along the processing surface 7a at the laser irradiation position O1. The gas flowing in the x1 (horizontal direction) blows off toward the spatter collection device 6 .

Here, the surface normal of the steel sheet 7 at the laser irradiation position O1 perpendicular to the sheet threading direction x1 is defined as L1, and the surface normal of the steel sheet 7 after the steel sheet 7 is bent toward the non-processed surface 7b side by the sheet threading direction changing roller 5 is Assuming that the surface normal perpendicular to the sheet passing direction x2 is L2, when the steel plate 7 is bent toward the non-worked surface 7b by the sheet passing direction changing roller 5, the surface normal L1 before the change is changed to the surface normal L2 after the change. Let the internal angle when changing to be a change angle θ. This change angle θ is such that the steel sheet 7 is bent from the threading direction x1 of the steel sheet 7 at the laser irradiation position O1 to the threading direction x2 by the sheet threading direction changing roller 5 toward the non-processed surface 7b side. It shows the bending angle when

Such a change angle θ should be an angle that can secure an installation space in which the spatter recovery device 6 can be installed on an extension line EL1 that is a linear extension of the sheet passing direction x1 of the steel plate 7 at the laser irradiation position O1. is not particularly limited. However, among them, the preferable change angle θ is 20 degrees or more and 90 degrees or less.

The spatter diffuses to some extent from the laser irradiation position O1, and part of the jet gas flows along the processing surface 7a of the steel plate 7. Therefore, if the change angle θ is small, Spatter will flow along. In that case, the spatter recovery device 6 may not be able to sufficiently recover the spatter. Therefore, by setting the change angle θ to 20 degrees or more, even if there is diffusion of spatter or flow along the processing surface 7a, the passing direction of the steel plate 7 can be greatly changed so that the vicinity of the laser irradiation position O1 can be detected. The spatter that has flowed in the vicinity of the processed surface 7a of the steel plate 7 is separated from the steel plate 7, so that the spatter recovery device 6 can easily recover the spatter.

Further, the larger the change angle θ, the larger the installation space of the spatter recovery device 6 can be set, and the opening 6b of the spatter recovery device 6 can be easily designed to be large. When .theta. is 90 degrees, the opening 6b that can be installed is almost maximum. On the other hand, if the change angle θ is further increased, the load on the sheet threading direction changing roller 5 due to the bending stress of the steel sheet 7 during sheet threading increases, and the design of the sheet threading direction changing roller 5 and the sheet threading speed are restricted. end up Therefore, it is preferable that the change angle θ is 90 degrees or less.

Even if the threading direction x1 of the steel sheet 7 is changed by the sheet threading direction changing roller 5 toward the non-processed surface 7b by the change angle θ, the gas jetted from the gas injection device 2 toward the laser irradiation position O1 is irradiated with the laser. The airflow can be an airflow that flows substantially along an extension line EL1 obtained by linearly extending the sheet passing direction x1 of the steel sheet 7 at the position O1.

In this case, the spatter collection device 6 is arranged on an extension line EL1 that is a linear extension of the sheet passing direction x1 of the steel sheet 7 at the laser irradiation position O1. Further, in the spatter recovery device 6, the distance D between the opening 6b for sucking gas in the atmosphere and the laser irradiation position O1 is selected to be a distance that can take in the gas flowing substantially along the extension line EL1. .

In this embodiment, the gas injection method from the gas injection device 2 is described as being substantially parallel to the sheet passing direction x1, but the gas may be injected obliquely from above toward the processing surface 7a of the steel plate 7. . Even in this case, the jetted gas is deflected by the working surface 7a of the steel plate 7 and flows substantially along the extension line EL1, so that the spatter can be blown off toward the spatter recovery device 6 arranged on the extension line EL1.

Here, the distance D between the opening 6b and the laser irradiation position O1 is determined by the gas injection force from the gas injection device 2, the suction force of the spatter recovery device 6, and the change in bending of the steel sheet 7 by the sheet threading direction changing roller 5. It can be determined by adjusting the size of the installation space formed by changing the angle θ.

The spatter recovery device 6 is arranged to extend the direction x1 of the steel plate 7 at the laser irradiation position O1 so that the extension line EL1 is included in the opening region of the opening 6b. A width H from 6c to the other end 6d is selected.

Since the passage of the steel sheet 7 is avoided by the sheet threading direction changing roller 5 , the spatter collecting device 6 does not interfere with the steel sheet 7 , and the spatter collecting device 6 is arranged on the side in which the steel sheet 7 is bent by the sheet threading direction changing roller 5 (see FIG. 1 ). 2), one end 6c of the opening 6b can be arranged.

By adjusting the change angle θ of the steel sheet 7 by the sheet threading direction changing roller 5, the one end 6c of the opening 6b is, for example, more inclined than the top of the sheet threading direction changing roller 5 around the laser irradiation position O1. Further, it can be arranged on the lower side.

Here, the relationship between the sheet passing direction x1 of the steel plate 7 at the laser irradiation position O1 and the airflow direction 8 of the gas flowing from the gas injection device 2 toward the laser irradiation position O1 will be described. The sheet passing direction x1 of the steel plate 7 at the laser irradiation position O1 and the airflow direction 8 of the gas flowing from the gas injection device 2 toward the laser irradiation position O1 do not necessarily have to be parallel. The opening 6b of the spatter collecting device 6 may be arranged ahead of the airflow direction 8. FIG.

As a result, when the sputter recovery device 6 recovers the spatter blown away by the airflow direction 8 of the gas flowing from the gas injection device 2 toward the laser irradiation position O1, the spatter recovery device 6 can It is also possible to collect the spatter that is blown off along the processing surface 7a toward .

More preferably, the spraying angle of the gas injected from the gas injection device 2 to the laser irradiation position O1, the distance from the laser irradiation position O1, etc. are adjusted, and the laser irradiation position O1 is applied to the processing surface 7a of the steel plate 7. It is desirable for the gas to flow along. As a result, since the airflow direction 8 of the gas flowing toward the laser irradiation position O1 substantially coincides with the sheet passing direction x1 of the steel sheet 7 at the laser irradiation position O1, the sheet passing direction x1 is linearly extended. The spatter can be blown off toward the spatter collection device 6 arranged on the line EL1.

Here, FIG. 3 is a schematic diagram showing the configuration of the spatter recovery device 6. As shown in FIG. As shown in FIG. 3, the spatter recovery device 6 has an opening 6b formed at the tip of a housing 6a, and a ventilation duct 10 is connected to the base side. The width H of one end 6c and the other end 6d of the opening 6b is formed wider than the width of the base side of the housing 6a to which the ventilation duct 10 is connected, and gradually increases from the opening 6b toward the base side. formed narrow. As a result, the spatter recovery device 6 is configured to be able to suck more gas in the air through the opening 6b, and can more reliably suck the spatter blown off toward the opening 6b by the gas.

(1-2) <Action and effect>
In the above configuration, the surface processing apparatus 1 injects gas to the laser irradiation position O1 where the laser 3a is irradiated onto the steel plate 7, and when processing the processing surface 7a with the laser 3a, the processing surface 7a is at the laser irradiation position O1. The spatter generated from is blown off by gas.

Then, in the surface processing apparatus 1, in the airflow direction 8 in which the gas flows from the gas injection device 2 toward the laser irradiation position O1, on the downstream side of the laser irradiation position O1 in the airflow direction, on the non-processing surface 7b side that is not processed by the laser 3a. The steel plate 7 is bent to change the passing direction x1 of the steel plate 7 at the laser irradiation position O1.

As described above, in the surface processing apparatus 1, the sheet threading direction x1 of the steel sheet 7 is changed by the sheet threading direction changing roller 5, so that the sheet threading direction x1 of the steel sheet 7 at the laser irradiation position O1 is linearly changed to the lateral direction. The spatter collector 6 can be arranged on the extended extension line EL1 without interfering with the steel plate 7. - 特許庁

Therefore, when the processing surface 7a is processed by the laser 3a, the spatter that scatters along the processing surface 7a of the steel plate 7 from the laser irradiation position O1 by the gas can be collected by the spatter collection device 6. FIG. Therefore, the surface processing apparatus 1 can collect the spatter more reliably than the conventional structure in which the spatter collecting apparatus is simply arranged facing the steel sheet 7, and the adhesion of the spatter to the steel sheet 7 is suppressed. obtain.

Further, in the first embodiment, the steel plate 7 passed in the horizontal direction is passed while being bent in the vertical direction by the passing direction changing roller 5, so that the direction x1 of the steel plate 7 at the laser irradiation position O1 is changed. The installation space for the sputter collecting device 6 can be formed on an extension line EL1 which is straightly extended in the lateral direction. As a result, the surface processing apparatus 1 can have a configuration in which the spatter recovery device 6 is arranged laterally with respect to the laser irradiation position O1, and the spatter scattered laterally from the laser irradiation position O1 can be recovered. can.

(2) <Second Embodiment>
(2-1) <Configuration of Surface Processing Apparatus According to Second Embodiment>
FIG. 4 is a schematic diagram showing the overall configuration of the surface processing device 21 according to the second embodiment. In the second embodiment, the threading direction x1 of the steel sheet 7 at the laser irradiation position O1 is the vertical direction, and the threading direction x2 changed by the sheet threading direction changing roller 5 is the horizontal direction. This differs from the first embodiment described above in that respect. Here, the vertical direction includes not only the vertical direction in which gravity acts, but also a direction inclined at a predetermined angle with respect to the vertical direction.

Hereinafter, description will be given focusing on the configuration different from that of the first embodiment, and description of the configuration that is the same as that of the first embodiment will be omitted to avoid duplication. As shown in FIG. 4, the laser irradiation device 3 in the second embodiment is arranged in the horizontal direction with respect to the steel plate 7 that passes in the vertical direction by the roller 9, and processes the steel plate 7 that passes in the vertical direction. The laser 3a is irradiated from a direction perpendicular to the surface 7a.

The gas injection device 2 is disposed upstream of the laser irradiation position O1 in the sheet threading direction x1 (vertical direction in FIG. 4) of the steel plate 7 at the laser irradiation position O1. A gas is jetted along the processing surface 7a of the steel plate 7 toward the laser irradiation position O1 downward from the direction upstream side. As a result, the gas injection device 2 is positioned downstream of the laser irradiation position O1 in the airflow direction 8 in which the gas flows from the vertical direction toward the laser irradiation position O1. blow away.

In addition to such a configuration, the sheet threading direction changing roller 5 is positioned downstream of the laser irradiation position O1 in the airflow direction 8 in which the gas flows toward the laser irradiation position O1 so that the steel sheet 7 is positioned on the non-processed surface 7b side. By bending, the sheet passing direction x1 of the steel sheet 7 at the laser irradiation position O1 is changed to the horizontal direction. In FIG. 4 as well, the threading direction of the steel sheet 7 at the laser irradiation position O1 is x1, and the threading direction of the steel sheet 7 changed by the threading direction changing roller 5 is x2. Further, in the second embodiment, as an example of the sheet threading direction x2 changed by the sheet threading direction changing roller 5, the horizontal direction is shown.

In the second embodiment as well, the sheet threading direction changing roller 5 bends the sheet threading direction x1 of the steel sheet 7 at the laser irradiation position O1 to the non-processed surface 7b side to change the sheet threading direction x2 to a different sheet threading direction x2. An installation space in which the spatter recovery device 6 can be installed without interfering with the steel plate 7 is formed on the downstream side in the airflow direction of the gas blown onto O1.

The spatter collecting device 6 is installed in an installation space formed by changing the sheet threading direction x1 of the steel sheet 7 by the sheet threading direction changing roller 5 in this manner. Thereby, the spatter collecting device 6 can be arranged in the vicinity of the laser irradiation position O1 without interfering with the steel plate 7 .

Next, in the surface processing apparatus 21 shown in FIG. 4, a configuration for collecting spatter generated on the processing surface 7a by the spatter collecting apparatus 6 will be described in detail. FIG. 5 is a partially enlarged view of the periphery of the threading direction changing roller 5 in the surface processing device 21 shown in FIG.

Here, when the steel plate 7 is bent from the threading direction x1 of the steel plate 7 at the laser irradiation position O1 toward the non-processed surface 7b side by the threading direction changing roller 5, the steel plate 7 is changed to the threading direction x2. The bending angle (changed angle) θ is determined by setting the spatter collecting device 6 on an extension line EL1 that is a linear extension of the sheet passing direction x1 of the steel sheet 7 at the laser irradiation position O1, as in the first embodiment described above. The angle is not particularly limited as long as the possible installation space can be secured, but the preferred change angle θ is 20 degrees or more and 90 degrees or less.

In the case of this embodiment, the laser irradiation position O1 for irradiating the laser 3a on the processing surface 7a is adjusted, and the sheet passing direction x1 at the laser irradiation position O1 and the airflow direction 8 of the gas flowing toward the laser irradiation position O1 are selected so that they are almost parallel to each other.

In the second embodiment, similarly to the above-described first embodiment, the sheet passing direction x1 of the steel plate 7 at the laser irradiation position O1 and the airflow direction of the gas flowing from the gas injection device 2 toward the laser irradiation position O1 8 does not necessarily have to be parallel, and the opening 6b of the spatter recovery device 6 may be arranged ahead of the sheet passing direction x1 and the air flow direction 8. FIG.

As a result, when the sputter recovery device 6 recovers the spatter blown away by the airflow direction 8 of the gas flowing from the gas injection device 2 toward the laser irradiation position O1, the spatter recovery device 6 can It is also possible to collect the spatter blown off along the .

(2-2) <Action and effect>
In the above configuration, even in the surface processing apparatus 21 according to the second embodiment, by changing the sheet threading direction x1 of the steel sheet 7 with the sheet threading direction changing roller 5, the steel sheet at the laser irradiation position O1 is prevented from interfering with the steel sheet 7. The spatter collecting device 6 can be arranged on an extension line EL1 which extends linearly downward in the sheet passing direction x1 of 7 as it is. Therefore, when the processing surface 7a is processed by the laser 3a, the spatter scattered along the processing surface 7a of the steel plate 7 from the laser irradiation position O1 by the gas is removed by the spatter recovery device 6 installed vertically downward, that is, in the direction of gravity. Therefore, the spatter that enters the opening 6b of the spatter recovery device 6 due to the action of gravity is less likely to rebound, so that the spatter can be recovered more reliably than before, and the spatter adheres to the steel plate 7. can be suppressed.

Further, in the second embodiment, the steel plate 7 threaded in the vertical direction is bent in the horizontal direction by the threading direction changing roller 5 so that the steel plate 7 is threaded at the laser irradiation position O1. An installation space for the sputter collection device 6 can be formed on an extension line EL1 that is linearly extended in the vertical direction in the direction x1. As a result, the surface processing apparatus 21 can have a structure in which the spatter recovery device 6 is arranged on the vertical side with respect to the laser irradiation position O1, and the spatter scattered in the vertical direction from the laser irradiation position O1 can be collected. can.

(3) <Third Embodiment>
(3-1) Configuration of water flow type spatter recovery device Next, a description will be given of a third embodiment in which the configuration of the spatter recovery device is changed. FIG. 6 shows a surface processing apparatus 31 provided with a water jet type spatter recovery device 32 instead of the spatter recovery device 6 of the surface processing device 21 shown in FIG. Here, the following description will focus on the water jet type spatter recovery device 32, which is different from the above-described second embodiment, and the description of other configurations will be omitted to avoid duplication.

As shown in FIG. 6, the surface processing device 31 injects gas toward the laser irradiation position O1 below from the gas injection device 2 arranged above the laser irradiation position O1. The water flow type spatter recovery device 32 is positioned below the laser irradiation position O1 and the sheet threading direction changing roller 5, and the sheet threading direction x1 of the steel sheet 7 at the laser irradiation position O1 is linearly extended as it is. It is arranged on the extension line EL1.

As a result, the spatter generated from the processing surface 7a of the steel plate 7 at the laser irradiation position O1 is caused by the gas flowing in the vertical direction (sheet threading direction x1) along the processing surface 7a of the steel plate 7 at the laser irradiation position O1. It is blown toward the recovery device 32 . The water flow type spatter recovery device 32 has a hollow reservoir 36 that communicates with the outside air through an opening 32d formed on the upper surface, and gas is blown toward the reservoir 36 . The water flow type spatter recovery device 32 has water W circulating in a reservoir 36, and the spatter is recovered by the reservoir 36 in which the water W is stored.

In this way, even if the spatter generated from the steel plate 7 at the laser irradiation position O1 is blown away along the processing surface 7a of the steel plate 7 by the gas, the surface processing device 31 can prevent the sheet passing direction of the steel plate 7 at the laser irradiation position O1. The spatters can be recovered by the water jet type spatter recovery device 32 arranged on the extension line EL1 extending linearly from x1.

Here, the reservoir 36 of the water flow type spatter recovery device 32 is provided with a supply pipe 32b for supplying water W into the reservoir 36 and a discharge pipe 32c for discharging the water W from the reservoir 36 . In the water flow type spatter recovery device 32, a pump (not shown) connected to the supply pipe 32b constantly feeds water W into the reservoir 36 from the supply pipe 32b.

A pump 35 and a dust collector 34 are connected to the water flow type spatter recovery device 32 via a pipe 33, and the dust collector 34 is connected to a discharge pipe 32c. When the pump 35 is driven, the water flow type spatter recovery device 32 sucks the water W in the reservoir 36 through the discharge pipe 32c and takes it into the dust collector 34 through the discharge pipe 32c. The dust collector 34 collects the spatter and the like contained in the taken water W, and then makes the pump 35 take in the water W from which the spatter and the like have been removed through the pipe 33 .

As a result, the water flow type spatter recovery device 32 discharges the old water W stored in the reservoir 36 from the discharge pipe 32c while fresh water W is constantly supplied from the supply pipe 32b. continues to circulate.

Next, the detailed configuration of the water jet type spatter recovery device 32 will be described below. FIG. 7 is a schematic diagram showing the configuration of the water jet type spatter recovery device 32. As shown in FIG. As shown in FIG. 7, the water jet spatter recovery device 32 has a housing 32a with an opening 32d formed on the top surface. The housing 32a has therein a hollow reservoir 36 communicating with the outside air through an opening 32d.

The reservoir 36 has an upper region 36a formed on the opening 32d side and a lower region 36b formed below the upper region 36a. The upper region 36a has a wide opening 32d and forms an inverted trapezoidal hollow space in which the inner surface slopes so that the width gradually narrows from the opening 32d toward the lower region 36b. A supply port 37a communicating with the supply pipe 32b is formed in the inclined inner wall surface of the upper region 36a.

The lower region 36b forms a hollow space narrower than the opening 32d, and has an inner wall surface formed with a discharge port 37b that communicates with the discharge pipe 32c. The reservoir 36 is constantly supplied with water W from a supply port 37a formed in the upper portion, and is constantly discharged from a discharge port 37b formed in the lower portion, so that the water W moves from top to bottom. ing.

(3-2) <Action and effect>
In the above configuration, even in the surface processing apparatus 31 according to the third embodiment, by changing the sheet threading direction x1 of the steel sheet 7 with the sheet threading direction changing roller 5, the steel sheet at the laser irradiation position O1 is prevented from interfering with the steel sheet 7. The water jet type spatter recovery device 32 can be arranged on an extension line EL1 which is a linear extension of the plate-passing direction x1 of 7. As shown in FIG. Therefore, when the processing surface 7a is processed by the laser 3a, the spatter scattered along the processing surface 7a of the steel plate 7 from the laser irradiation position O1 by the gas can be collected by the water jet type spatter collection device 32. Also, the spatter can be more reliably collected, and adhesion of the spatter to the steel plate 7 can be suppressed.

In addition to this, the water flow type spatter recovery device 32 absorbs the impact of the spatter by the water W in the reservoir 36 even if the spatter generated from the steel plate 7 is blown off at the laser irradiation position O1 (FIG. 7). can do. Therefore, in the water jet type spatter recovery device 32, since the spatter is less likely to collide directly with the inner wall surface of the housing 32a, the rebounding of the spatter can be suppressed, and the spatter can be more reliably recovered.

Furthermore, even if the spatter such as high-temperature metal grains generated at the laser irradiation position O1, the water-flow type spatter recovery device 32 can instantly cool the spatter by the water W in the storage section 36. It is possible to reduce the influence of the heat of the spatter on the peripheral equipment arranged around the spatter recovery device 32 .

(4) <Other embodiments>
In each of the above-described embodiments, a grain-oriented electrical steel sheet is used as the steel sheet, but the present invention is not limited to this, and various other steel sheets such as non-oriented electrical steel sheets and simple steel sheets can be used. may Processing by laser irradiation may be not only the formation of grooves, but also cutting of steel plates and various other surface processing. Further, the threading direction x1 of the steel sheet 7 at the laser irradiation position O1 and the threading direction x2 changed by the sheet threading direction changing roller are not limited to the horizontal and vertical directions described in the above-described embodiments. It may be in other directions.

Further, in each of the above-described embodiments, the gas injection device 2 is provided on the upstream side of the laser irradiation position O1 in the sheet passing direction, and the spatter recovery device 6 or the water flow type spatter recovery device is provided on the downstream side of the laser irradiation position O1 in the plate passing direction. Although the device 32 is provided to cause the airflow to flow in the same direction as the sheet passing direction x1, the present invention is not limited to this. For example, the gas injection device 2 is provided downstream of the laser irradiation position O1 in the plate threading direction, and the spatter recovery device 6 or the water flow type spatter recovery device 32 is provided upstream of the laser irradiation position O1 in the plate threading direction. The airflow may be caused to flow in the direction opposite to x1.

REFERENCE SIGNS LIST 1, 21, 31 surface processing device 2 gas injection device 3 laser irradiation device 5 plate threading direction changing roller 6 spatter recovery device 7 steel plate 7a processed surface 7b non-processed surface 9 roller 32 water flow type spatter recovery device (spatter recovery device)

Claims (5)

a plurality of rollers for threading the steel plate;
a laser irradiation device for irradiating the processed surface of the steel plate with a laser to process the processed surface;
The laser is provided on the upstream side in the sheet threading direction of the steel sheet from the laser irradiation position where the laser is irradiated on the steel sheet, and the gas is jetted from the upstream side in the sheet threading direction toward the laser irradiation position. a gas injection device for blowing off spatter generated from the processing surface at the laser irradiation position when processing the processing surface by
provided on the downstream side of the laser irradiation position in the plate threading direction so that the airflow direction of the gas does not follow the processing surface at the downstream side of the laser irradiation position in the plate threading direction, a threading direction changing roller that changes the threading direction of the steel sheet by bending the steel sheet to a non-processed surface side that is not processed by the laser;
In the space created by changing the sheet threading direction of the steel sheet with the sheet threading direction changing roller, the gas is arranged on an extension linearly extending the threading direction of the steel sheet at the laser irradiation position. a spatter recovery device for recovering the spatter scattered along the steel plate from the laser irradiation position by
A surface processing device comprising: The spatter recovery device is
An opening for collecting the spatter is provided on the extension line in the plate passing direction at the laser irradiation position.
The surface processing apparatus according to claim 1. The laser irradiation device is
irradiating the laser from a direction perpendicular to the processed surface of the steel plate,
The gas injection device is
jetting the gas along the processing surface from a direction perpendicular to the optical axis of the laser emitted from the laser irradiation device;
The surface processing device according to claim 1 or 2. The laser irradiation device is
irradiating the laser on the processed surface of the steel sheet being passed in the longitudinal direction;
The gas injection device is
Injecting the gas along the processed surface of the steel plate toward the laser irradiation position on the lower side in the vertical direction,
The spatter recovery device is
It is arranged on an extension line straightly extending downward in the longitudinal direction in the sheet threading direction of the steel plate at the laser irradiation position,
A surface processing apparatus according to any one of claims 1 to 3. The spatter recovery device is
A water-flow type spatter recovery apparatus comprising a reservoir to which water is supplied through a supply pipe and discharged through a discharge pipe, wherein the spatter is recovered by the reservoir through which the water circulates.
The surface processing apparatus according to claim 4.

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