JP6679351B2 - Processing nozzle and processing equipment - Google Patents

Description

  The present invention relates to a processing nozzle that is arranged toward a processing site and forms a gas region when processing a workpiece in water, and a processing apparatus to which the processing nozzle is applied.

  For example, Patent Document 1 discloses a laser cutting device. This laser cutting device includes a cutting nozzle that allows a laser beam to pass therethrough. The cutting nozzle has an assist gas nozzle for injecting an assist gas for blowing off a melted material melted by a laser beam, and a shield gas nozzle for injecting a shield gas for protecting the assist gas, and the assist gas nozzle is an inner nozzle. It has been shown to have a double nozzle structure consisting of an outer nozzle and an outer nozzle, the inner nozzle passing a laser beam and injecting an oxygen-containing gas, and the outer nozzle being arranged coaxially with the inner nozzle. Further, Patent Document 1 discloses that an assist gas, a shield gas, and a pressurized water curtain are jetted because a laser cutting device is used for underwater cutting. The pressurized water curtain is annularly arranged so as to surround the assist gas nozzle and the shield gas nozzle, and is jetted by the pressurized water curtain nozzle coaxially arranged with respect to the assist gas nozzle and the shield gas nozzle.

JP, 2011-177788, A

  In the pressurized water curtain nozzle shown in Patent Document 1, the water forming the pressurized water curtain is supplied from a water tank to a cutting head by a water pump, and the water supplied to the cutting head is jetted from an annular nozzle through a water passage. It In this structure, the water supplied from the water passage to the annular nozzle flows along the circumferential direction of the annular nozzle. For this reason, in the annular nozzle, the water flow rate in the portion close to the water passage increases, and the water flow rate decreases as the distance from the water passage increases, causing a large deviation in the flow distribution of the water jet in the circumferential direction. As a result, a portion where the water is weakly ejected is generated in the circumferential direction, and surrounding water may infiltrate into the dry spot, which is a gas region including the assist gas and the shield gas. The ingress of water is a problem because the presence of water during welding leads to welding defects.

  The present invention is to solve the above-mentioned problems, and to provide a processing nozzle and a processing device capable of making the circumferential flow rate distribution of water ejected from a water ejection nozzle formed in an annular shape uniform. Is the first purpose.

  By the way, in order to reduce the risk of infiltration of water into the gas region where welding is performed, it is desirable to increase the jet flow rate of the gas supplied to the gas region to increase the gas pressure in the gas region. However, if the gas ejection flow rate is increased, the gas flow velocity at the welding location will increase, and, for example, welding defects may occur due to the inclusion of surrounding gas in the melted welded portion, which may result in deterioration of welding quality. Therefore, the gas ejection flow rate cannot be simply increased and a limitation occurs. Therefore, the present invention is to solve the above-mentioned problems, and to provide a processing nozzle and a processing device capable of improving the shielding performance for preventing water from entering the gas region while ensuring welding quality. Is the second purpose.

  In order to achieve the above-mentioned first object, the processing nozzle of the present invention comprises a gas injection nozzle and a water injection nozzle annularly formed so as to surround the periphery of the gas injection nozzle. The nozzle has at least one water supply passage to which water is supplied, an annular cavity to which the water supply passage is connected, and an ejection port connected to the cavity and extending in a direction along the direction of the gas injection nozzle. An annular nozzle portion having, a passage cross-sectional area of the cavity is formed larger than an opening area of a connection port of the nozzle portion with the cavity, and a passage radial dimension of the cavity is of the nozzle portion. It is characterized in that it is formed to be larger than the opening size of the connection port with the cavity.

  According to this processing nozzle, since the passage cross-sectional area of the cavity is formed larger than the opening area of the connection port with the cavity in the nozzle portion, the water supplied from the water supply passage to the cavity in the water injection nozzle is By reducing the flow velocity and recovering the static pressure in the cavity, the deviation of the flow pressure (the pressure in the entire circumferential direction) at each annular circumferential position of the cavity is reduced. Moreover, since the dimension of the cavity in the radial direction of the cavity is formed larger than the opening dimension of the connection port with the cavity in the nozzle portion, when water flows from the cavity to the nozzle portion, a contracted flow occurs, which causes resistance. The deviation of the pressure of the flow (the pressure in the entire circumferential direction) at each position in the annular circumferential direction of the cavity is reduced. As a result, it is possible to make the flow rate distribution of the water jetted from the annular nozzle portion uniform in the circumferential direction. Therefore, it is possible to suppress the occurrence of a portion where the water is weakly ejected in the circumferential direction, and prevent the situation where the surrounding water invades the dry spot which is the gas region.

  Further, in the processing nozzle of the present invention, the ratio of the passage cross-sectional area S1 of the cavity to the opening area S2 of the connection port of the nozzle portion with the cavity is 0.01 ≦ S2 / S1 ≦ 0.15. It is characterized by satisfying the range.

  If S2 / S1 exceeds 0.15, the cavity becomes relatively small, so that it becomes difficult to obtain the action of reducing the flow velocity in the nozzle portion. On the other hand, if S2 / S1 is less than 0.01, the cavity becomes relatively large, so that the required pressure to be supplied to the water injection nozzle increases, and the processing nozzle becomes large. Therefore, by satisfying the range of 0.01 ≦ S2 / S1 ≦ 0.15, it is possible to remarkably obtain the effect of uniformizing the flow rate distribution of water jetted from the water jet nozzle formed in the annular shape in the circumferential direction. it can.

  Further, in the processing nozzle of the present invention, the opening direction of the connection port with the cavity in the water supply passage is provided deviating from the connection port with the cavity in the nozzle portion.

  According to this processing nozzle, the water flowing into the cavity from the water supply passage temporarily collides with the inner wall surface of the cavity without directly going to the connection port with the cavity in the nozzle portion. Therefore, the energy (dynamic pressure) of the water flowing into the cavity from the water supply passage is suppressed and then flows into the connection port with the cavity in the nozzle section, so the circumferential distribution of the pressure that causes the water to flow into the nozzle section. Can be made uniform. As a result, it is possible to remarkably obtain the effect of making the flow rate distribution of the water jetted from the water jet nozzle formed in the annular shape uniform in the circumferential direction.

  Further, in the processing nozzle of the present invention, a partition member is provided between a connection port of the water supply passage with the cavity and a connection port of the nozzle portion with the cavity.

  According to this processing nozzle, the water flowing into the cavity from the water supply passage collides with the partition member once without directly going to the connection port of the nozzle portion with the cavity. Therefore, the energy (dynamic pressure) of the water flowing into the cavity from the water supply passage is suppressed and then flows into the connection port with the cavity in the nozzle section, so the circumferential distribution of the pressure that causes the water to flow into the nozzle section. Can be made uniform. As a result, it is possible to remarkably obtain the effect of making the flow rate distribution of the water jetted from the water jet nozzle formed in the annular shape uniform in the circumferential direction.

  Further, in the processing nozzle of the present invention, a flow resistance member is provided between a connection port of the water supply passage with the cavity and a connection port of the nozzle portion with the cavity.

  According to this processing nozzle, the flow resistance is imparted to the water flowing into the cavity from the water supply passage by the flow resistance member before reaching the connection port with the cavity in the nozzle portion. For this reason, the ratio of the flow resistance related to the flow rate distribution is relatively reduced in the cavity, and the total flow rate resistance in the circumferential direction is made uniform, so that the circumferential distribution of the pressure that causes the water to flow into the nozzle portion is made uniform. can do. As a result, it is possible to remarkably obtain the effect of making the flow rate distribution of the water jetted from the water jet nozzle formed in the annular shape uniform in the circumferential direction.

  Further, in the processing nozzle of the present invention, the nozzle portion is formed such that a cross-sectional area thereof is gradually reduced from a connection port with the cavity toward the injection port.

  According to this processing nozzle, since the flow path area of the nozzle portion decreases in the flow direction of the water, the flow velocity deviation (flow rate deviation) of the flow can be reduced by the rectifying effect of the flow contraction. The deviation of the water flow rate in the circumferential direction of the jet flow can be suppressed. As a result, it is possible to remarkably obtain the effect of making the flow rate distribution of the water jetted from the water jet nozzle formed in the annular shape uniform in the circumferential direction.

  Further, in the processing nozzle of the present invention, the gas injection nozzle is further provided with a flow resistance body which is formed in a cylindrical shape with an open tip and serves as a flow resistance of the gas while allowing the gas to pass through in and out. Is arranged so as to face the opening side of the tip portion of the flow resistor and to surround the periphery of the flow resistor.

  According to this processing nozzle, the flow resistance body is arranged inside the gas injection nozzle so as to surround the processing portion in a tubular shape. Then, the flow resistance element imparts flow resistance to the gas injected from the gas injection nozzle, so that the gas is less likely to flow into the processed portion. As a result, even if the ejection flow rate of the gas ejected from the gas ejection nozzle is increased in order to improve the shielding property for preventing water from flowing into the dry spot, which is a gas region, it is possible to suppress an increase in the gas flow velocity at the processing site. . As a result, the shield performance can be improved while ensuring the welding quality.

  In order to achieve the above-mentioned first object, the processing apparatus of the present invention includes a processing nozzle of any one of the above-described inventions, a gas supply unit that supplies gas to the gas injection nozzle, and a water injection nozzle. A water supply unit that supplies water to the water supply passage, and a processing head provided as a processing region in a gas injection region of the gas injection nozzle are provided.

  According to this processing device, it is possible to obtain the effect of making the flow rate distribution of the water jetted from the water jet nozzle formed in the annular shape uniform in the circumferential direction, and suppressing the occurrence of weak water jet locations in the circumferential direction. However, since it is possible to prevent the surrounding water from entering the dry spot, which is the processing region, it is possible to improve the workability in water.

  In order to achieve the above-mentioned second object, the processing nozzle of the present invention has a flow resistance body that is a tubular shape with an open tip and serves as a flow resistance of the gas while allowing the gas to pass inside and outside, A shield gas injection nozzle is arranged so as to direct an injection port to the opening side of the tip of the flow resistor and to surround the circumference of the flow resistor, and a jet to the opening side of the tip of the flow resistor. And a water injection nozzle formed in an annular shape so as to face the mouth and surround the gas injection nozzle.

  According to this processing nozzle, the flow resistance body is arranged inside the tube surrounded by the shield gas injection nozzle so as to surround the processing portion with its tubular shape. Then, since the flow resistance element imparts flow resistance to the shield gas injected from the shield gas injection nozzle, it is difficult for the shield gas to flow into the processed portion. As a result, even if the ejection flow rate of the shield gas ejected from the shield gas ejection nozzle is increased in order to improve the shielding property to prevent the inflow of water to the dry spot, which is a gas region, the gas flow velocity at the processing site is increased. Can be suppressed. As a result, the shield performance can be improved while ensuring the welding quality.

  Further, in the processing nozzle of the present invention, the shield gas injection nozzle is arranged such that the injection port is directed to a side along the outer periphery of the flow resistance body or a side away from the flow resistance body.

  According to this processing nozzle, the shield gas jetted from the shield gas jet nozzle is prevented from directly colliding with the flow resistor. As a result, it is possible to make it difficult for the shield gas to flow into the processed portion.

  Further, in the processing nozzle of the present invention, the flow resistance body is formed such that the tip end portion thereof is bent back outward.

  According to this processing nozzle, the tip of the flow resistor is formed so as to be bent back to the outside, so that when the processing portion is processed while moving the processing nozzle, the flow resistor follows this movement. The tip of the can be brought into contact with the periphery of the processing site. As a result, it is possible to make it difficult for the shield gas to flow into the processed portion.

  Further, the processing nozzle of the present invention further comprises an assist gas injection nozzle arranged with the injection port facing the opening side of the tip of the flow resistance body inside the tubular shape of the flow resistance body. To do.

  According to this processing nozzle, the assist gas can be supplied to the inside of the tubular shape of the flow resistor. Therefore, the dry spot Da inside the tubular shape of the flow resistor inside the gas region, the dry spot Db outside the tubular form of the flow resistor inside the gas region, and the outside of the dry spot (outside the gas region). The pressure in each of the underwater region W can be set to Da> Db> W. As a result, at the dry spot Da inside the tubular portion of the flow resistor, it is possible to suppress the gas ejection flow rate and increase the gas pressure to make it difficult for the assist gas to flow into the processed portion, and the dry spot Da outside the tubular portion of the flow resistor is provided. At the spot Db, the flow rate of gas jet can be increased to prevent the inflow of water from the underwater region W. As a result, the shield performance can be improved while ensuring the welding quality.

  Further, in the processing nozzle of the present invention, it is formed in an annular shape so as to surround the periphery of the injection port of the shield gas injection nozzle between the injection port of the shield gas injection nozzle and the injection port of the water injection nozzle. Along with, the base end portion is further attached to the radial direction inner side of the water injection nozzle, the tip portion further comprises a shielding member provided at a position radially outer than the base end portion, the shield gas injection nozzle, It is characterized in that it is arranged with the injection port facing in a direction along the inner surface of the shielding member.

  According to this processing nozzle, since the shield gas injection nozzle is arranged with the injection port facing in the direction along the inner surface of the shielding member, the shield gas injected from the shield gas injection nozzle is a dry gas region. Since the spot flows along the inner surface of the shielding member farthest from the processed portion, the gas flow rate of the shield gas toward the processed portion can be reduced. Thereby, even if the gas ejection flow rate of the shield gas ejected from the shield gas ejection nozzle is increased in order to improve the shielding property for preventing the inflow of water to the dry spot, it is possible to suppress the increase in the gas flow velocity at the processing site. As a result, the shield performance can be improved while ensuring the welding quality.

  Further, in the processing nozzle of the present invention, the shield gas injection nozzle is characterized in that an injection port is arranged with a step portion between the shield gas injection nozzle and the base end portion of the shielding member.

  According to this processing nozzle, the stepped portion provided between the base end portion of the shielding member and the injection port causes the shield gas injected from the injection port to generate a circulating flow, and the circulating flow causes a Coanda effect. The main flow of the shield gas injected from the mouth is attracted to the shield member side and flows along the inner surface of the shield member so as to adhere to the inner surface of the shield member. As a result, even if the gas ejection flow rate of the shield gas ejected from the shield gas ejection nozzle is increased in order to improve the shielding property for preventing the inflow of water to the dry spot, the effect of suppressing the increase of the gas flow velocity at the processing site can be suppressed. Becomes noticeable. As a result, the shield performance can be improved while ensuring the welding quality.

  Further, in the processing nozzle of the present invention, the flow resistance body is formed such that a tip portion thereof extends beyond a position of a tip portion of the shielding member.

  According to this processing nozzle, since the shielding member is formed in an annular shape, a surface surrounding the tip portion in an annular shape is formed. By extending the tip portion of the flow resistor from the position of the tip portion, the tip portion of the flow resistor projects from the surface surrounding the ring portion with respect to the tip portion to the outside of the region surrounded by the shielding member. Therefore, at the time of processing, the tip portion of the flow resistor can be sufficiently brought into contact with the periphery of the processed portion. As a result, the effect of making it difficult for the shield gas to flow into the processed portion becomes remarkable. As a result, the shield performance can be improved while ensuring the welding quality.

  In order to achieve the above-mentioned second object, the processing apparatus of the present invention includes any one of the processing nozzles described above, a shield gas supply unit that supplies gas to the shield gas injection nozzle, and an assist gas injection nozzle. An assist gas supply unit that supplies gas to the assist gas injection nozzle when arranged, a water supply unit that supplies water to the water injection nozzle, and a tubular interior of the flow resistor are provided as a processing region. And a machining head.

  According to this processing apparatus, since the flow resistance body imparts flow resistance to the shield gas injected from the shield gas injection nozzle, it is difficult for the shield gas to flow into the processed portion. As a result, even if the ejection flow rate of the shield gas ejected from the shield gas ejection nozzle is increased in order to improve the shielding property to prevent the inflow of water to the dry spot, which is a gas region, the gas flow velocity at the processing site is increased. Can be suppressed. As a result, it is possible to improve the shield performance while ensuring the welding quality, so that it is possible to improve the workability in water.

  According to the present invention, it is possible to make the circumferential flow rate distribution of water jetted from a water jet nozzle formed in an annular shape uniform. Further, according to the present invention, it is possible to improve the shield performance for preventing the infiltration of water into the gas region while ensuring the welding quality.

FIG. 1 is a schematic configuration diagram of a processing apparatus according to an embodiment of the present invention. FIG. 2 is a view on arrow AA in FIG. FIG. 3 is a sectional view taken along line BB in FIG. FIG. 4 is a schematic configuration diagram of another example of the processing apparatus according to the first embodiment of the present invention. FIG. 5 is a schematic configuration diagram of another example of the processing nozzle according to the first embodiment of the present invention. FIG. 6 is a schematic configuration diagram of another example of the processing nozzle according to the first embodiment of the present invention. FIG. 7 is a schematic configuration diagram of another example of the processing nozzle according to the first embodiment of the present invention. FIG. 8 is a schematic configuration diagram of another example of the processing nozzle according to the first embodiment of the present invention. FIG. 9 is a schematic configuration diagram of another example of the processing nozzle according to the first embodiment of the present invention. FIG. 10 is a schematic configuration diagram of another example of the processing nozzle according to the first embodiment of the present invention. FIG. 11 is a schematic configuration diagram of another example of the processing nozzle according to the first embodiment of the present invention. FIG. 12 is a schematic configuration diagram of a processing apparatus according to the second embodiment of the present invention. FIG. 13 is a view on arrow A′-A ′ in FIG. 12. FIG. 14 is a sectional view taken along the line B'-B 'in FIG. FIG. 15 is a schematic configuration diagram of another example of the processing apparatus according to the second embodiment of the present invention. FIG. 16 is a schematic configuration diagram of a processing nozzle according to the second embodiment of the present invention. FIG. 17 is a schematic configuration diagram of another example of the processing nozzle according to the second embodiment of the present invention. FIG. 18 is a schematic configuration diagram of another example of the processing nozzle according to the second embodiment of the present invention. FIG. 19 is a schematic configuration diagram of another example of the processing nozzle according to the second embodiment of the present invention. FIG. 20 is a schematic configuration diagram of another example of the processing nozzle according to the second embodiment of the present invention. FIG. 21 is a schematic configuration diagram of another example of the processing nozzle according to the second embodiment of the present invention. FIG. 22 is a schematic configuration diagram of another example of the processing nozzle according to the second embodiment of the present invention. FIG. 23 is a schematic configuration diagram of another example of the processing nozzle according to the second embodiment of the present invention.

[Embodiment 1]
Embodiment 1 according to the present invention will be described below in detail with reference to the drawings. The present invention is not limited to this embodiment. In addition, constituent elements in the following embodiments include elements that can be easily replaced by those skilled in the art, or substantially the same elements.

  FIG. 1 is a schematic configuration diagram of a processing apparatus according to this embodiment. FIG. 2 is a view on arrow AA in FIG. FIG. 3 is a sectional view taken along line BB in FIG.

  As shown in FIG. 1, the processing apparatus 1 of the present embodiment processes a workpiece 100 in water. The processing includes, for example, welding and cutting, and the processing method includes, for example, TIG welding shown in FIG. In the present embodiment, overlay welding by TIG welding will be mainly described.

  As shown in FIG. 1, the processing device 1 of the present embodiment includes a processing head 2, a processing nozzle 3, a gas supply unit 4, and a water supply unit 5.

  The processing head 2 includes a welding torch 2A. The welding torch 2A is provided so as to penetrate the torch insertion nozzle 3A of the processing nozzle 3. Further, the processing device 1 includes the welding wire 2B at a position corresponding to the tip of the welding torch 2A. The welding wire 2B penetrates through the processing nozzle 3 and is supported thereby.

  The machining nozzle 3 is not shown so as to install the tip of the welding torch 2A formed in a cylindrical shape and provided on the machining head 2 at a distance suitable for machining the machining site 100A of the workpiece 100 underwater. It is held in water by a holding means (for example, a manipulator). The processing nozzle 3 includes a torch insertion nozzle 3A, a gas injection nozzle 3B, and a water injection nozzle 3C.

  The torch insertion nozzle 3A is a hole provided in the center of the processing nozzle 3 for inserting the welding torch 2A of the processing head 2 and has an opening 3Aa for arranging the welding torch 2A in the processing region 100A of the workpiece 100. Have.

  The gas injection nozzle 3B is for injecting an assist gas (argon gas, nitrogen gas, etc.), and is arranged so as to surround the periphery of the torch insertion nozzle 3A, as shown in FIG. 1, on the tip side of the welding torch 2A. It is formed as a hole that opens toward the ejection port 3Ba. In this embodiment, as shown in FIG. 2, the gas injection nozzle 3B is formed as a hole formed in an annular shape around the cylindrical central axis C of the processing nozzle 3 so as to surround the torch insertion nozzle 3A. Has been done. In addition, although not explicitly shown in the drawing, the gas injection nozzle 3B may be formed as a plurality of holes arranged so as to surround the torch insertion nozzle 3A. In the present embodiment, as shown in FIG. 1, the gas injection nozzle 3B has the injection port 3Ba formed on the same plane as the opening 3Aa of the torch insertion nozzle 3A. In addition, although not explicitly shown in the drawing, the gas injection nozzle 3B is a position depressed toward the rear side of the opening 3Aa of the torch insertion nozzle 3A in the direction of the torch insertion nozzle 3A (the side opposite to the tip of the welding torch 2A). The injection port 3Ba may be provided in the torch insertion nozzle 3A, and the injection port 3Ba is provided at a position protruding toward the front side (the tip side of the welding torch 2A) of the torch insertion nozzle 3A with respect to the opening 3Aa of the torch insertion nozzle 3A. May be.

  The water jet nozzle 3C jets water, and is arranged so as to surround the periphery of the gas jet nozzle 3B and opens in a direction along the direction of the gas jet nozzle 3B, as shown in FIGS. It is formed as a hole. In the present embodiment, the water injection nozzle 3C is formed as an annular hole so as to surround the gas injection nozzle 3B, as shown in FIGS. 2 and 3.

  As shown in FIGS. 1 to 3, the water injection nozzle 3C includes a water supply passage 3Ca, a cavity 3Cb, and a nozzle portion 3Cc.

  The water supply passage 3Ca is connected to the water supply unit 5, and is not an annular shape but at least one passage hole in the water injection nozzle 3C configured as an annular hole. In FIG. 3, four water supply passages 3Ca are provided at equal intervals in the circumferential direction. Further, the water supply passage 3Ca is connected to the cavity 3Cb via the connection port 3Caa as shown in FIG.

  As shown in FIGS. 2 and 3, the cavity 3Cb is formed as an annular cavity so as to surround the periphery of the gas injection nozzle 3B, and is formed so as to open in the direction along the direction of the gas injection nozzle 3B. ing. As described above, the cavity 3Cb is connected to the water supply passage 3Ca via the connection port 3Caa.

  As shown in FIGS. 2 and 3, the nozzle portion 3Cc is formed as an annular hole so as to surround the periphery of the gas injection nozzle 3B. As shown in FIG. 1, the nozzle portion 3Cc is connected to the cavity 3Cb via the connection port 3Cca. Moreover, as shown in FIG. 1, the nozzle portion 3Cc is formed so that the injection port 3Ccb opens in the direction along the direction of the gas injection nozzle 3B. As shown in FIG. 1, the nozzle portion 3Cc is formed so as to extend from the connection port 3Cca to the ejection port 3Ccb and separate from the central axis C. In this embodiment, as shown in FIG. 1, the nozzle portion 3Cc has the injection port 3Ccb formed on the same plane as the injection port 3Ba of the gas injection nozzle 3B. In addition, although not shown in the drawing, the nozzle portion 3Cc is a position that is recessed on the rear side of the gas injection nozzle 3B with respect to the injection port 3Ba of the gas injection nozzle 3B (the side opposite to the direction in which the assist gas is injected). May be provided with the injection port 3Ccb, and the injection port 3Ccb is provided at a position protruding toward the front side (the side where the assist gas is injected) of the gas injection nozzle 3B with respect to the injection port 3Ba of the gas injection nozzle 3B. It may be.

  In such a water injection nozzle 3C, the water supplied by the water supply unit 5 passes through the inside of the processing nozzle 3 in the order of the water supply passage 3Ca, the cavity 3Cb, and the nozzle unit 3Cc, and from the injection port 3Ccb of the nozzle unit 3Cc. Is jetted. Further, since the water jet nozzle 3C is formed so that the nozzle portion 3Cc reaches the jet port 3Ccb from the connection port 3Cca and is separated from the central axis C, the water jetted from the jet port 3Ccb from the central axis C It is jetted in a radial pattern diagonally away.

  The gas supply unit 4 supplies the assist gas to the gas injection nozzle 3B. The gas supply unit 4 is connected to the gas injection nozzle 3B through a gas supply pipe 4A, and includes a gas storage tank (not shown) arranged at a position out of the water. By supplying the gas to 4A by a compressor or the like, the assist gas is supplied to the gas injection nozzle 3B, and the assist gas is injected from the gas injection nozzle 3B.

  The water supply unit 5 supplies water to the water jet nozzle 3C. The water supply unit 5 is connected to the water injection nozzle 3C via a water supply pipe 5A, and includes a water storage tank (not shown) arranged at a position out of the water. Water is supplied to the water injection nozzle 3C by pumping water to 5A by a pump or the like, and water is injected from the water injection nozzle 3C. The water supply unit 5 may be configured to supply water to the water injection nozzle 3C by pumping the water in which the processing nozzle 3 is arranged by a pump or the like, and to inject the water from the water injection nozzle 3C. . Further, since the water injection nozzle 3C is provided with a plurality of water supply passages 3Ca, the water supply unit 5 is configured such that the water supply pipe 5A is branched into a plurality of water supply passages 3Ca corresponding to the water supply passages 3Ca.

  By the way, FIG. 4 is a schematic configuration diagram of another example of the processing apparatus according to the present embodiment. The processing apparatus 1 shown in FIG. 4 performs laser processing and has a processing head 6 instead of the above-described processing head 2. The processing head 6 irradiates the laser beam 6A and is attached to the processing nozzle 3. The processing nozzle 3, to which the processing head 6 is attached, holds the laser beam 6A emitted from the processing head 6 at a distance suitable for processing the processing portion 100A of the workpiece 100 in water (not shown). For example, it is held in water by a manipulator). The processing nozzle 3 includes a laser irradiation nozzle 3D instead of the torch insertion nozzle 3A described above. The laser irradiation nozzle 3D is a hole that is provided in the center of the processing nozzle 3 and that allows the laser beam 6A emitted from the processing head 6 to pass therethrough, and is used to irradiate the processing portion 100A of the workpiece 100 with the laser beam 6A. It has an irradiation port 3Da. Since other configurations are the same as those of the processing apparatus 1 shown in FIG.

  In the processing apparatus 1 described above, as shown in FIG. 1 (or FIG. 4), the processing nozzle 3 has an opening 3 </ b> Aa of the torch insertion nozzle 3 </ b> A at a predetermined interval with respect to the processing site 100 </ b> A of the workpiece 100 in water. (Or, the irradiation port 3Da of the laser irradiation nozzle 3D) is held in a facing state. Then, in the processing apparatus 1, the assist gas supplied by the gas supply unit 4 is injected from the gas injection nozzle 3B. The assist gas injected from the gas injection nozzle 3B reaches a part of the processing site 100A of the workpiece 100 around the area to be welded by the welding torch 2A (or laser beam 6A), and the gas injection region of the part is a gas region. Is formed as a dry spot D. The processing head 2 (6) is provided within the gas injection area of the gas injection nozzle 3B as a processing area. Further, in the processing device 1, the water supplied by the water supply unit 5 is jetted from the water jet nozzle 3C. The water jetted from the water jet nozzle 3C reaches the workpiece 100 around the dry spot D, and forms a water curtain WS around the dry spot D by the water flow. The water curtain WS prevents water from flowing into the dry spot D.

  In the processing nozzle 3 applied to the processing apparatus 1 configured as described above, the water injection nozzle 3C has a passage cross-sectional area in the direction along the central axis C of the cavity 3Cb, and a connection port with the cavity 3Cb in the nozzle portion 3Cc. The opening area is larger than 3 Cca. The passage cross-sectional area in the direction along the central axis C of the cavity 3Cb is the cross-sectional area of the passage, and since the cavity 3Cb forms an annular passage, both sides of the central axis C shown in FIGS. The cross-sectional area is one of the two cross-sectional shapes. Further, the opening area of the connection port 3Cca is the opening area of the connection port 3Cca that is annularly continuous in the annular nozzle portion 3Cc.

  Further, in the processing nozzle 3, in the water jet nozzle 3C, as shown in FIGS. 1, 3 and 4, the passage radial dimension D1 of the cavity 3Cb is the opening of the connection port 3Cca of the nozzle portion 3Cc with the cavity 3Cb. It is formed larger than the dimension D2. The radial direction is a direction orthogonal to the central axis C.

  According to this processing nozzle 3, the passage cross-sectional area in the direction along the central axis C of the cavity 3Cb is formed larger than the opening area of the connection port 3Cca with the cavity 3Cb in the nozzle portion 3Cc. The water supplied from the water supply passage 3Ca to the cavity 3Cb in the nozzle 3C has a reduced flow velocity in the cavity 3Cb and the static pressure is recovered. The deviation of the pressure (in the whole direction) is reduced. Moreover, since the dimension D1 of the cavity 3Cb in the passage radial direction is formed larger than the opening dimension D2 of the connection port 3Cca with the cavity 3Cb in the nozzle portion 3Cc, the water is compressed when the water flows from the cavity 3Cb to the nozzle portion 3Cc. Since a flow is generated and becomes a resistance, the deviation of the flow pressure (the pressure in the entire circumferential direction) at each annular circumferential position of the cavity 3Cb is reduced. As a result, it is possible to make the flow rate distribution of water jetted from the annular nozzle portion 3Cc uniform in the circumferential direction. Therefore, it is possible to suppress the generation of a weak water jet in the circumferential direction and prevent the surrounding water from entering the dry spot D, which is a gas region.

  In the processing nozzle 3 of this embodiment, the ratio of the passage cross-sectional area S1 of the cavity 3Cb to the opening area S2 of the connection port 3Cca of the cavity 3Cb in the nozzle portion 3Cc is 0.01 ≦ S2 / S1 ≦ 0. It is preferable to satisfy the range of 0.15.

  When S2 / S1 exceeds 0.15, the cavity 3Cb becomes relatively small, so that it becomes difficult to obtain the action of reducing the flow velocity in the nozzle portion 3Cc. On the other hand, if S2 / S1 is less than 0.01, the cavity 3Cb becomes relatively large, so that the required pressure to be supplied to the water injection nozzle 3C increases, and the processing nozzle 3 becomes large. Therefore, by satisfying the range of 0.01 ≦ S2 / S1 ≦ 0.15, it is possible to remarkably obtain the effect of uniformizing the flow rate distribution of the water jetted from the water jet nozzle 3C formed in the annular shape in the circumferential direction. You can

  5 and 6 are schematic configuration diagrams of another example of the processing nozzle according to the present embodiment. As shown in FIGS. 5 and 6, in the processing nozzle 3 of the present embodiment, the opening direction of the connection port 3Caa with the cavity 3Cb in the water supply passage 3Ca is deviated from the connection port 3Cca with the cavity 3Cb in the nozzle portion 3Cc. Are preferably provided.

  The opening direction of the connection port 3Caa with the cavity 3Cb in the water supply passage 3Ca is the direction of the water supply passage 3Ca and is the inflow direction of water flowing from the water supply passage 3Ca into the cavity 3Cb.

  In the example shown in FIG. 5, the water supply passage 3Ca is provided in a direction along the central axis C and is provided separately from the connection port 3Cca with the cavity 3Cb in the nozzle portion 3Cc. Further, in the example shown in FIG. 6, the water supply passage 3Ca may be provided so as to intersect with the central axis C, so that the water supply passage 3Ca may be provided outside the connection port 3Cca with the cavity 3Cb in the nozzle portion 3Cc.

  Therefore, since the opening direction of the connection port 3Caa of the water supply passage 3Ca with the cavity 3Cb is provided outside the connection port 3Cca of the nozzle portion 3Cc with the cavity 3Cb, the water supply passage 3Ca flows into the cavity 3Cb. The water once collides with the inner wall surface of the cavity 3Cb without directly going to the connection port 3Cca of the nozzle portion 3Cc with the cavity 3Cb. Therefore, after the energy (dynamic pressure) of the water flowing into the cavity 3Cb from the water supply passage 3Ca is suppressed, it flows into the connection port 3Cca of the nozzle 3Cc with the cavity 3Cb, so that the water flows into the nozzle 3Cc. The circumferential pressure distribution can be made uniform. As a result, it is possible to remarkably obtain the effect of making the flow rate distribution of the water jetted from the water jet nozzle 3C formed in the annular shape uniform in the circumferential direction.

  7 and 8 are schematic configuration diagrams of another example of the processing nozzle according to the present embodiment. As shown in FIG. 7 and FIG. 8, in the processing nozzle 3 of the present embodiment, a partition is provided between the connection port 3Caa with the cavity 3Cb in the water supply passage 3Ca and the connection port 3Cca with the cavity 3Cb in the nozzle portion 3Cc. It is preferable that the member 3Cd is provided.

  As shown in FIGS. 7 and 8, the partition member 3Cd is provided inside the cavity 3Cb and is formed in an annular shape along the annular shape of the cavity 3Cb. The partition member 3Cd is provided in the opening direction of the connection port 3Caa with the cavity 3Cb in the water supply passage 3Ca so as to partition a part of the inside of the cavity 3Cb, and is connected to the connection port 3Cca with the cavity 3Cb in the nozzle portion 3Cc. An opening 3Cda is provided so as to communicate with each other. The opening 3Cda does not exist in the opening direction of the connection port 3Caa with the cavity 3Cb in the water supply passage 3Ca. As shown in FIGS. 7 and 8, the partition member 3Cd exists in the opening direction of the connection port 3Caa with the cavity 3Cb in the water supply passage 3Ca, and the opening 3Cda of the connection port 3Caa with the cavity 3Cb in the water supply passage 3Ca. The arrangement is not limited as long as it does not exist in the opening direction. That is, the forms shown in FIGS. 7 and 8 are examples. Further, a plurality of partition members 3Cd may be provided. Further, as in the example shown in FIG. 6, the water supply passage 3Ca may be provided so as to cross the central axis C.

  Therefore, since the partition member 3Cd is provided in the opening direction of the connection port 3Caa with the cavity 3Cb in the water supply passage 3Ca, the water flowing into the cavity 3Cb from the water supply passage 3Ca is separated from the cavity 3Cb in the nozzle portion 3Cc. Instead of directly going to the connection port 3Cca, it collides with the partition member 3Cd once. Therefore, after the energy (dynamic pressure) of the water flowing into the cavity 3Cb from the water supply passage 3Ca is suppressed, it flows into the connection port 3Cca of the nozzle 3Cc with the cavity 3Cb, so that the water flows into the nozzle 3Cc. The circumferential pressure distribution can be made uniform. As a result, it is possible to remarkably obtain the effect of making the flow rate distribution of the water jetted from the water jet nozzle 3C formed in the annular shape uniform in the circumferential direction.

  9 and 10 are schematic configuration diagrams of another example of the processing nozzle according to the present embodiment. As shown in FIGS. 9 and 10, in the processing nozzle 3 of the present embodiment, the flow between the connection port 3Caa with the cavity 3Cb in the water supply passage 3Ca and the connection port 3Cca with the cavity 3Cb in the nozzle portion 3Cc. It is preferable that the resistance member 3Ce is provided.

  As shown in FIGS. 9 and 10, the flow resistance member 3Ce is provided inside the cavity 3Cb and formed in an annular shape along the annular shape of the cavity 3Cb. The flow resistance member 3Ce is a perforated plate that is present in the opening direction of the connection port 3Caa with the cavity 3Cb in the water supply passage 3Ca and is provided so as to partition a part of the inside of the cavity 3Cb, and the cavity 3Cb in the nozzle portion 3Cc. A large number of small holes that reach the connection port 3Cca and communicate with each other are formed. As shown in FIG. 9 and FIG. 10, the flow resistance member 3Ce is not limited to the arrangement as long as it exists in the opening direction of the connection port 3Caa with the cavity 3Cb in the water supply passage 3Ca. That is, the configurations shown in FIGS. 9 and 10 are examples. Further, a plurality of flow resistance members 3Ce as the perforated plate may be provided. Further, as in the example shown in FIG. 6, the water supply passage 3Ca may be provided so as to cross the central axis C.

  Further, the flow resistance member 3Ce is not limited to the perforated plate shown in FIGS. 9 and 10, and although not shown in the figure, it may be a metal material, ceramics, glass or resin forming a porous material, and the water supply passage. It is provided between the connection port 3Caa of the cavity 3Cb in 3Ca and the connection port 3Cca of the cavity 3Cb in the nozzle portion 3Cc in the opening direction of the connection port 3Caa in the water supply passage 3Ca and the cavity 3Cb. . Although not shown in the drawing, the flow resistance member 3Ce may be a wire brush, and may be a connection port 3Caa with the cavity 3Cb in the water supply passage 3Ca and a connection port 3Cca with the cavity 3Cb in the nozzle portion 3Cc. It is provided between the water supply passage 3Ca and the cavity 3Cb in the opening direction of the connection port 3Caa.

  Therefore, since the flow resistance member 3Ce is provided in the opening direction of the connection port 3Caa with the cavity 3Cb in the water supply passage 3Ca, the water flowing into the cavity 3Cb from the water supply passage 3Ca is not the same as the cavity 3Cb in the nozzle portion 3Cc. Before reaching the connection port 3Cca, the flow resistance is given by the flow resistance member 3Ce. For this reason, the ratio of the flow resistance involved in the flow rate distribution is relatively reduced in the cavity 3Cb, and the total flow rate resistance in the circumferential direction is made uniform, so that the circumferential distribution of the pressure for causing water to flow into the nozzle portion 3Cc is made uniform. It can be made uniform. As a result, it is possible to remarkably obtain the effect of making the flow rate distribution of the water jetted from the water jet nozzle 3C formed in the annular shape uniform in the circumferential direction.

  FIG. 11 is a schematic configuration diagram of another example of the processing nozzle according to the present embodiment. As shown in FIG. 11, in the processing nozzle 3 of the present embodiment, it is preferable that the nozzle portion 3Cc be formed so that the cross-sectional area gradually decreases from the connection port 3Cca with the cavity 3Cb toward the injection port 3Ccb.

  Therefore, since the flow path area of the nozzle portion 3Cc decreases in the flow direction of the water, the flow velocity deviation (flow rate deviation) of the flow can be reduced by the rectifying effect of the flow contraction, and the circumferential direction of the water jet can be reduced. The deviation of the water flow rate can be suppressed. As a result, it is possible to remarkably obtain the effect of making the flow rate distribution of the water jetted from the water jet nozzle 3C formed in the annular shape uniform in the circumferential direction.

  It should be noted that the forms shown in FIGS. 5 to 11 can be used in an appropriate combination to remarkably obtain the effect of making the flow rate distribution of the water jetted from the water jet nozzle 3C formed in the annular shape uniform in the circumferential direction. it can. Further, as in the example shown in FIG. 6, the water supply passage 3Ca may be provided so as to cross the central axis C.

  Further, in the processing apparatus 1 to which the processing nozzle 3 of the present embodiment is applied, the processing nozzle 3, the gas supply unit 4 that supplies gas to the gas injection nozzle 3B, and the water supply of the water injection nozzle 3C. A water supply unit 5 that supplies water to the passage 3Ca and processing heads 2 and 6 provided as a processing region inside the gas injection region of the gas injection nozzle 3B are provided.

  According to this processing device 1, it is possible to obtain the effect of making the flow rate distribution of the water jetted from the water jet nozzle 3C formed in an annular shape uniform in the circumferential direction, and generating a portion where the water jet is weak in the circumferential direction. Since it is possible to prevent the situation where the surrounding water enters the dry spot D which is the processing region, it is possible to improve the workability in water.

  By the way, in the above-described embodiment, the processing nozzle 3 is provided with the water supply passage 3Ca in the water injection nozzle 3C, but the water supply pipe 5A of the water supply unit 5 is directly connected to the cavity 3Cb. It may be used instead of 3Ca.

[Embodiment 2]
Embodiment 2 according to the present invention will be described below in detail with reference to the drawings. The present invention is not limited to this embodiment. In addition, constituent elements in the following embodiments include elements that can be easily replaced by those skilled in the art, or substantially the same elements.

  FIG. 12 is a schematic configuration diagram of the processing apparatus according to the present embodiment. FIG. 13 is a view on arrow A′-A ′ in FIG. 12. FIG. 14 is a sectional view taken along the line B'-B 'in FIG.

  As shown in FIG. 12, the processing apparatus 11 of the present embodiment is for processing the workpiece 1100 in water. The processing includes, for example, welding and cutting, and the processing method includes, for example, TIG welding shown in FIG. In the present embodiment, overlay welding by TIG welding will be mainly described.

  As shown in FIG. 12, the processing apparatus 11 of this embodiment includes a processing head 12, a processing nozzle 13, a shield gas supply unit 14, and a water supply unit 15.

  The processing head 12 includes a welding torch 12A. The welding torch 12A is provided so as to penetrate the torch insertion nozzle 13A (not shown in FIGS. 13 and 14) of the processing nozzle 13. The processing device 11 also includes a welding wire 12B at a position corresponding to the tip of the welding torch 12A. The welding wire 12B is supported by penetrating the processing nozzle 13.

  The machining nozzle 13 is not shown so as to install the tip of the welding torch 12A formed in a cylindrical shape and provided on the machining head 12 at a distance suitable for machining the machining site 1100A of the underwater workpiece 1100. It is held in water by a holding means (for example, a manipulator). The processing nozzle 13 includes a torch insertion nozzle 13A, a shield gas injection nozzle 13B, and a water injection nozzle 13C.

  The torch insertion nozzle 13A is a hole provided in the center of the processing nozzle 13 for inserting the welding torch 12A of the processing head 12, and has an opening 13Aa for arranging the welding torch 12A in the processing region 1100A of the workpiece 1100. Have.

  The shield gas injection nozzle 13B is for injecting a shield gas (argon gas, nitrogen gas, etc.), and is arranged so as to surround the periphery of the welding torch 12A, as shown in FIG. 12, on the tip side of the welding torch 12A. It is formed as a hole that opens toward the ejection port 13Ba. In this embodiment, as shown in FIG. 13, the shield gas injection nozzle 13B is formed as an annular hole formed around the cylindrical central axis C of the processing nozzle 13. In addition, although not shown in the drawing, the shield gas injection nozzle 13B may be formed as a plurality of holes annularly arranged around the cylindrical central axis C of the processing nozzle 13. In this embodiment, the shield gas injection nozzle 13B has an injection port 13Ba formed on the same plane as the opening 13Aa of the torch insertion nozzle 13A, as shown in FIG. In addition, although not shown in the drawing, the shield gas injection nozzle 13B is recessed in the rear side of the opening 13Aa of the torch insertion nozzle 13A in the direction of the torch insertion nozzle 13A (the side opposite to the tip of the welding torch 12A). The injection port 13Ba may be provided at a position, and the injection port 13Ba is provided at a position protruding toward the front side (the tip end side of the welding torch 12A) in the direction of the torch insertion nozzle 13A with respect to the opening 13Aa of the torch insertion nozzle 13A. It may be.

  The water jet nozzle 13C jets water, and as shown in FIGS. 12 to 14, is arranged so as to surround the periphery of the shield gas jet nozzle 13B, and extends in a direction along the direction of the shield gas jet nozzle 13B. It is formed as an opening. In the present embodiment, the water injection nozzle 13C is formed as an annular hole so as to surround the shield gas injection nozzle 13B, as shown in FIGS. 13 and 14.

  As shown in FIGS. 12 to 14, the water injection nozzle 3C has a water supply passage 13Ca, an annular passage 13Cb, and a nozzle portion 13Cc.

  The water supply passage 13Ca is connected to the water supply unit 15, and is formed as at least one passage hole in the water injection nozzle 13C formed as an annular hole, not as an annular shape. In FIG. 14, four water supply passages 13Ca are provided at equal intervals in the circumferential direction. The water supply passage 13Ca is connected to the annular passage 13Cb as shown in FIG.

  As shown in FIGS. 13 and 14, the annular passage 13Cb is formed as an annular hole so as to surround the circumference of the shield gas injection nozzle 13B, and is opened toward the side along the direction of the shield gas injection nozzle 13B. Has been formed. The water supply passage 13Ca is connected to the annular passage 13Cb as described above.

  As shown in FIG. 13, the nozzle portion 13Cc is formed as an annular hole so as to surround the periphery of the shield gas injection nozzle 13B. As shown in FIG. 12, the nozzle portion 13Cc is connected to the annular passage 13Cb via the connection port 13Cca. Further, as shown in FIG. 12, the nozzle portion 13Cc is formed so that the injection port 13Ccb is opened in the direction along the direction of the shield gas injection nozzle 13B. As shown in FIG. 12, the nozzle portion 13Cc is formed so as to extend from the connection port 13Cca to the ejection port 13Ccb and separate from the central axis C. In this embodiment, as shown in FIG. 12, the nozzle portion 13Cc has the injection port 13Ccb formed on the same plane as the injection port 13Ba of the shield gas injection nozzle 13B. In addition, although not shown in the drawing, the nozzle portion 13Cc is recessed in the rear side of the shield gas injection nozzle 13B in the direction of the shield gas injection nozzle 13B (opposite to the direction in which the shield gas is injected). The injection port 13Ccb may be provided at a different position, and the injection is performed at a position projecting to the front side (the side where the shield gas is injected) of the shield gas injection nozzle 13B with respect to the injection port 13Ba of the shield gas injection nozzle 13B. The mouth 13Ccb may be provided.

  In such a water injection nozzle 13C, the water supplied by the water supply unit 15 passes through the processing nozzle 13 in the order of the water supply passage 13Ca, the annular passage 13Cb, and the nozzle portion 13Cc, and the ejection port 13Ccb of the nozzle portion 13Cc. Is jetted from. Further, since the water jet nozzle 13C is formed so that the nozzle portion 13Cc reaches the jet port 13Ccb from the connection port 13Cca and is separated from the central axis C, the water jetted from the jet port 13Ccb from the central axis C It is jetted in a radial pattern diagonally away from each other.

  The shield gas supply unit 14 supplies the shield gas to the shield gas injection nozzle 13B. The shield gas supply unit 14 is connected to the shield gas injection nozzle 13B via a gas supply pipe 14A, and includes a gas storage tank (not shown) arranged at a position out of the water. Then, the shield gas is supplied from the gas storage tank to the gas supply pipe 14A by a compressor or the like to supply the shield gas to the shield gas injection nozzle 13B, and the shield gas injection nozzle 13B injects the shield gas.

  The water supply unit 15 supplies water to the water jet nozzle 13C. The water supply unit 15 is connected to the water injection nozzle 13C via a water supply pipe 15A, and includes a water storage tank (not shown) arranged at a position out of the water. Then, the water is supplied to the water injection nozzle 13C by pumping the water from the water storage tank to the water supply pipe 15A by a pump or the like, and the water is injected from the water injection nozzle 13C. The water supply unit 15 may be configured to supply water to the water injection nozzle 13C by pumping the water in which the processing nozzle 13 is arranged by a pump or the like, and to inject the water from the water injection nozzle 13C. . In addition, since the water injection nozzle 13C is provided with a plurality of water supply passages 13Ca, the water supply unit 15 is configured such that the water supply pipe 15A is branched into a plurality of water supply passages 13A corresponding to the respective water supply passages 13Ca.

  By the way, FIG. 15 is a schematic configuration diagram of another example of the processing apparatus according to the present embodiment. The processing apparatus 11 shown in FIG. 15 performs laser processing, and has a processing head 16 instead of the processing head 12 described above. The processing head 16 irradiates the laser beam 16A and is attached to the processing nozzle 13. The machining nozzle 13 to which the machining head 16 is attached irradiates the laser beam 16A emitted from the machining head 16 at a distance suitable for machining the machining site 1100A of the workpiece 1100 underwater (not shown). For example, it is held in water by a manipulator). The processing nozzle 13 includes a laser irradiation nozzle 13D instead of the torch insertion nozzle 13A described above. The laser irradiation nozzle 13D is a hole that is provided near the center of the processing nozzle 13 and allows the laser beam 16A emitted from the processing head 16 to pass therethrough, and is for irradiating the laser beam 16A to the processing portion 1100A of the workpiece 1100. Has an irradiation port 13Da. Other configurations are the same as those of the processing apparatus 11 shown in FIG. 12, and therefore, the same reference numerals are given to the same portions and the description thereof will be omitted.

  In the processing apparatus 11 described above, as shown in FIG. 12 (or FIG. 15), the processing nozzle 13 has an opening 13 </ b> Aa of the torch insertion nozzle 13 </ b> A at a predetermined interval with respect to the processing site 1100 </ b> A of the underwater workpiece 1100. (Or, the irradiation port 13Da of the laser irradiation nozzle 13D) is held in a state in which it is oriented. Then, in the processing device 11, the shield gas supplied by the shield gas supply unit 14 is injected from the shield gas injection nozzle 13B. The shield gas sprayed from the shield gas spray nozzle 13B reaches a part of the processing site 1100A of the workpiece 1100 around the area to be welded by the welding torch 12A (or the laser beam 16A), and the gas spray region of the part is a gas. It is formed as a dry spot D which is an area. The processing head 12 (16) is provided within the gas injection area of the shield gas injection nozzle 13B as a processing area. Further, in the processing device 11, the water supplied by the water supply unit 15 is jetted from the water jet nozzle 13C. The water jetted from the water jet nozzle 13C reaches the workpiece 1100 around the dry spot D, and forms a water curtain WS around the dry spot D by the water flow. The water curtain WS prevents water from flowing into the dry spot D.

  FIG. 16 is a schematic configuration diagram of the processing nozzle according to the present embodiment.

  The processing nozzle 13 applied to the processing device 11 includes a flow resistor 17, as shown in FIG.

  The flow resistance body 17 is formed in a tubular shape and is inside a ring surrounded by the ring-shaped injection ports 13Ba of the shield gas injection nozzle 13B, and the opening 13Aa of the torch insertion nozzle 13A (or the laser irradiation nozzle 13D). The base end portion 17a is attached to the processing nozzle 13 and the tip end portion 17b is provided so as to surround the irradiation port 13Da). The flow resistance body 17 is made of a porous material, a porous plate, a brush, or the like, and has a flow resistance of gas while allowing the gas to pass through the inside and outside of the cylindrical shape. The flow resistance body 17 has a cylindrical shape in which the diameters of the base end portion 17a and the front end portion 17b are the same, the diameter of the front end portion 17b is larger than the base end portion 17a, and the front end portion is larger than the base end portion 17a. There are those in which the diameter of the portion 17b is small, those in which the diameters of the base end portion 17a and the tip end portion 17b change in the middle, and the like.

  Therefore, the flow resistor 17 is arranged so as to surround the processed portion 1100A in a tubular shape inside the shield gas injection nozzle 13B. Then, since the flow resistance body 17 imparts flow resistance to the shield gas injected from the shield gas injection nozzle 13B, it becomes difficult for the shield gas to flow into the processed portion 1100A. Thereby, even if the gas ejection flow rate of the shield gas ejected from the shield gas ejection nozzle 13B is increased in order to improve the shielding property for preventing the inflow of water from the water curtain WS to the dry spot D, the gas in the processed portion 1100A is increased. The rise in flow velocity can be suppressed. As a result, according to the processing nozzle 13 of the present embodiment, it is possible to improve the shield performance while ensuring the welding quality.

  FIG. 17 is a schematic configuration diagram of another example of the processing nozzle according to the present embodiment.

  In the processing nozzle 13 of the present embodiment, the shield gas injection nozzle 13B has the injection port 13Ba directed toward the side along the outer periphery of the flow resistor 17 as shown in FIG. 16 or the away side as shown in FIG. Are preferably arranged.

  That is, in the shield gas injection nozzle 13 </ b> B, the shield gas injected from the injection port 13 </ b> Ba flows along the outer circumference of the flow resistance body 17 or flows away from the outer circumference of the flow resistance body 17. Therefore, the processing nozzle 13 prevents the shield gas injected from the shield gas injection nozzle 13B from directly colliding with the flow resistor 17. As a result, the shield gas can be made difficult to flow into the processed portion 1100A.

  FIG. 18 is a schematic configuration diagram of another example of the processing nozzle according to the present embodiment.

  In the processing nozzle 13 of the present embodiment, as shown in FIG. 18, it is preferable that the flow resistance body 17 is formed such that the tip portion 17b is bent outward.

  According to the processing nozzle 13, the tip portion 17b of the flow resistance body 17 is formed by being bent outward, so that when the processing portion 1100A is processed while the processing nozzle 13 is moved, the movement follows the movement. Then, the tip portion 17b of the flow resistor 17 can be brought into contact with the periphery of the processed portion 1100A. As a result, the shield gas can be made difficult to flow into the processed portion 1100A. Since the effect of bringing the tip portion 17b of the flow resistance body 17 into contact with the periphery of the processed portion 1100A following the movement of the processing nozzle 13 is remarkable, at least the tip portion 17b of the flow resistance body 17 has flexibility. It is preferable to have.

  FIG. 19 is a schematic configuration diagram of another example of the processing nozzle according to the present embodiment.

  The processing nozzle 13 of the present embodiment preferably further includes an assist gas injection nozzle 13E as shown in FIG. The assist gas injection nozzle 13E injects an assist gas (argon gas, nitrogen gas, etc.), which is arranged near the welding torch 12A (not shown in the drawing), and has a flow resistance inside the tubular shape of the flow resistance body 17. It is formed as a hole that is opened with the injection port 13Ea facing the opening side of the tip portion 17b of the body 17. The assist gas injection nozzle 13E is formed as a single hole or a plurality of holes. In the present embodiment, the assist gas injection nozzle 13E is illustrated such that the injection port 13Ea is formed on the same plane as the opening 13Aa of the torch insertion nozzle 13A. However, with respect to the opening 13Aa of the torch insertion nozzle 13A. Even if the injection port 13Ea is provided at the position recessed on the rear side of the direction of the torch insertion nozzle 13A (the side opposite to the tip of the welding torch 12A), the torch insertion nozzle is opened relative to the opening 13Aa of the torch insertion nozzle 13A. The injection port 13Ea may be provided at a position projecting to the front side in the direction of 13A (the tip side of the welding torch 12A).

  Further, in the processing apparatus 11 of the present embodiment, as shown in FIG. 19, when the assist gas injection nozzle 13E is provided, the assist gas supply unit 18 is provided. The assist gas supply unit 18 supplies the assist gas to the assist gas injection nozzle 13E. The assist gas supply unit 18 is connected to the assist gas injection nozzle 13E via a gas supply pipe 18A, and includes a gas storage tank (not shown) arranged at a position out of the water. Then, the assist gas is supplied from the gas storage tank to the gas supply pipe 18A by a compressor or the like to supply the assist gas to the assist gas injection nozzle 13E, and the assist gas injection nozzle 13E injects the assist gas.

  As described above, in the processing nozzle 13 of the present embodiment, the assist gas injection nozzle 13E is arranged with the injection port 13Ea facing the opening side of the tip portion 17b of the flow resistance body 17 inside the tubular shape of the flow resistance body 17. Is preferably further provided.

  According to the processing nozzle 13, the assist gas can be supplied into the tubular shape of the flow resistor 17. Therefore, the dry spot Da inside the tubular shape of the flow resistor 17 in the gas region, the dry spot Db outside the tubular form of the flow resistor 17 in the gas region, and the outside of the dry spot D (in the gas region). It is possible to set the pressure of each area with the underwater area W (outside) to Da> Db> W. As a result, in the dry spot Da inside the tubular shape of the flow resistance body 17, it is possible to suppress the gas ejection flow rate and increase the gas pressure to make it difficult for the assist gas to flow into the processed portion 1100A. At the external dry spot Db, the flow rate of gas jet can be increased to prevent the inflow of water from the underwater region W. As a result, the shield performance can be improved while ensuring the welding quality.

  20 to 23 are schematic configuration diagrams of another example of the processing nozzle according to the present embodiment.

  The processing nozzle 13 of the present embodiment preferably further includes a shielding member 19, as shown in FIGS. 20 to 23.

  As shown in FIG. 20, the shielding member 19 surrounds the injection port 13Ba of the shield gas injection nozzle 13B between the injection port 13Ba of the shield gas injection nozzle 13B and the injection port 13Ccb of the water injection nozzle 13C. It is formed in a ring shape. The shielding member 19 is provided such that the base end portion 19a is attached to the inside of the water jet nozzle 13C in the radial direction, the tip end portion 19b is located outside of the base end portion 19a in the radial direction, and the jet port of the water jet nozzle 13C is provided. It is preferable to be arranged so as to intersect with the direction of 13Ccb. The radial direction is a direction orthogonal to the central axis C, the radially inner side is the side closer to the central axis C, and the radially outer side is the side away from the central axis C. The tip end 19b of the shielding member 19 is brought into contact with the surface of the workpiece 1100 during processing.

  The shield member 19 is arranged such that the tip end portion 19b contacts the surface of the workpiece 1100 and is the opening 13Aa of the torch insertion nozzle 13A (or the irradiation opening 13Da of the laser irradiation nozzle 13D) and surrounds the processed portion 1100A. It Then, in the processing device 11, the shield gas supplied by the shield gas supply unit 14 is injected from the shield gas injection nozzle 13B. The shield gas sprayed from the shield gas spray nozzle 13B reaches a part of the processing site 1100A of the workpiece 1100 around the welding torch 12A (or laser beam 16A) and is surrounded by the shielding member 19 in a gas spray region. Is formed as a dry spot D which is a gas region. The processing head 12 is provided as a processing area in the gas injection area of the shield gas injection nozzle 13B. The dry spot D surrounded by the shielding member 19 has a higher pressure than the water outside the shielding member 19 due to the shield gas injected from the shield gas injection nozzle 13B. Further, in the processing device 11, the water supplied by the water supply unit 15 is jetted from the water jet nozzle 13C. The water jetted from the water jet nozzle 13C collides with the shield member 19 when the shield member 19 is disposed so as to intersect with the direction of the jet port 13Ccb of the water jet nozzle 13C, and the water flow causes the shield member 19 to flow. To the dry spot D side. As a result, it is possible to suppress the deviation in the circumferential direction of the gap between the tip portion 19b of the shielding member 19 and the surface of the workpiece 1100, and to suppress the local reduction of the shielding effect in the circumferential direction. Therefore, by providing the shielding member 19, it is possible to block the inflow of water into the dry spot D, which is a gas region, and prevent the intrusion of water into the inside of the gas region during underwater processing.

  In the processing nozzle 13 of the present embodiment, it is preferable that the shield gas injection nozzle 13B is arranged with the injection port 13Ba facing the inner surface of the shielding member 19 with respect to the shielding member 19 that functions as described above. .

  According to this processing nozzle 13, the shield gas jet nozzle 13B is arranged with the jet port 13Ba facing the inner surface of the shielding member 19, so that the shield gas jetted from the shield gas jet nozzle 13B is In the dry spot D, which is a gas region, the gas flows along the inner surface of the shield member 19 farthest from the processed portion 1100A, so that the gas flow rate of the shield gas toward the processed portion 1100A can be reduced. As a result, even if the gas ejection flow rate of the shield gas ejected from the shield gas ejection nozzle 13B is increased in order to improve the shielding property for preventing water from flowing into the dry spot D, the gas flow velocity at the processed portion 1100A is increased. Can be suppressed. As a result, the shield performance can be improved while ensuring the welding quality.

  In the processing nozzle 13 of the present embodiment, as shown in FIG. 21, in the shield gas injection nozzle 13B, the injection port 13Ba is arranged with a stepped portion 13Bb between the shield gas injection nozzle 13B and the base end 19a. It is preferable.

  According to this processing nozzle 13, the stepped portion 13Bb provided between the base end portion 19a of the shielding member 19 and the ejection port 13Ba causes the shield ejected from the ejection port 13Ba as indicated by an arrow G in FIG. A circulation flow is generated by the gas, and the main flow of the shield gas injected from the injection port 13Ba is attracted toward the shielding member 19 side by the Coanda effect due to the circulation flow, and the inner surface of the shielding member 19 is adhered to the inner surface of the shielding member 19. Flow along. As a result, even if the gas ejection flow rate of the shield gas ejected from the shield gas ejection nozzle 13B is increased in order to improve the shielding property for preventing water from flowing into the dry spot D, the gas flow velocity at the processed portion 1100A is increased. The effect that can be suppressed becomes remarkable. As a result, the shield performance can be improved while ensuring the welding quality.

  Further, in the processing nozzle 13 of the present embodiment, the flow resistance body 17 is preferably formed such that the tip portion 17b extends beyond the position of the tip portion 19b of the shielding member 19. That is, since the shielding member 19 is formed in a ring shape, a surface surrounding the tip portion 19b in a ring shape is formed. By extending the tip portion 17b of the flow resistor 17 from the position of the tip portion 19b, the tip portion of the flow resistor 17 is located outside the area surrounded by the shielding member 19 from the surface surrounding the tip portion 19b in an annular shape. 17b projects. Therefore, at the time of processing, the tip portion 17b of the flow resistance body 17 can be sufficiently brought into contact with the periphery of the processed portion 1100A. As a result, the effect of making it difficult for the shield gas to flow into the processed portion 1100A becomes remarkable. As a result, according to the processing nozzle 13 of the present embodiment, it is possible to improve the shield performance while ensuring the welding quality.

  By the way, in the processing nozzle 13 of the present embodiment, as shown in FIG. 20, it is preferable that the shield member 19 is formed such that the tip end portion 19b thereof is curved outward. The shield member 19 is formed such that the tip end portion 19b is opposite to the extending direction so as to move away from the surface of the workpiece 1100 at the time of installation, and is bent back outward in the radial direction in a folded shape. As a result, the shield member 19 is arranged such that the tip portion 19b intersects the direction of the jet port 13Ccb of the water jet nozzle 13C.

  Therefore, since the tip end portion 19b of the shielding member 19 is formed by curving outward, the water jetted from the water jet nozzle 13C is turned at the tip end portion 19b of the shielding member 19. For this reason, the reaction force that presses toward the surface of the workpiece 1100 in the jetting direction of the water jet nozzle 13C acts on the tip portion 19b of the shielding member 19, and the tip portion 19b of the shielding member 19 and the workpiece 1100. It is possible to suppress the deviation of the gap between the surface and the surface in the circumferential direction, and it is possible to further suppress the reduction of the local shielding effect in the circumferential direction. As a result, the effect of blocking the inflow of water into the dry spot D, which is a gas region, and preventing the intrusion of water into the inside of the gas region during underwater processing can be remarkably obtained.

  Further, the processing nozzle 13 of the present embodiment preferably includes a support member 20, as shown in FIG. The support member 20 extends in the radial direction along the shielding member 19 and is provided along the annular inner side of the shielding member 19. The base 20a of the support member 20 is attached to the inside of the water jet nozzle 13C in the radial direction, and the tip 20b is formed shorter than the tip 19b of the shielding member 19. A plurality of the support members 20 are provided in the circumferential direction.

  Therefore, by providing the support member 20, the shielding member 19 can be reinforced so as not to be deformed inward in the radial direction by the water sprayed from the water spray nozzle 13C. The base end portion 20a of the support member 20 is preferably supported by the processing nozzle 13 and attached so as to be swingable along the central axis C. It is possible to follow the movement of the shielding member 19 due to the pressure and the pressure of the water jetted from the water jet nozzle 13C. Further, the tip portion 20b of the support member 20 is preferably formed into a spherical shape, and the support member 20 is smoothly covered without hindering the movement when the processing nozzle 13 is moved along the workpiece 1100. It can be attached to the surface of the workpiece 1100.

  Further, in the processing nozzle 13 of the present embodiment, the shielding member 19 preferably has flexibility.

  The flexible structure can be realized by selecting a flexible material such as rubber, resin, or metal as the material forming the shielding member 19. Further, the flexible structure can be realized by forming the shielding member 19 in a bellows shape in which peaks and valleys are alternately formed from the base end portion 19a to the tip end portion 19b, as shown in FIG. Further, as shown in FIG. 23, the flexible structure can be realized by forming the shielding member 19 in a bellows shape in which peaks and valleys are alternately formed in the circumferential direction.

  Therefore, since the shielding member 19 has flexibility, the shielding member 19 bends following the pressure of the shield gas ejected from the shield gas injecting nozzle 13B and the pressure of the water ejected from the water injecting nozzle 13C. Therefore, the tip end portion 19b of the shielding member 19 can be always attached to the surface of the workpiece 1100.

  The configuration of the processing nozzle 13 of the second embodiment described above can be applied to the processing nozzle 3 of the first embodiment, and in addition to the effect of the processing nozzle 3 of the first embodiment, the processing of the second embodiment is performed. The effect of the use nozzle 13 can be obtained.

1 Processing Device 2 Processing Head 2A Welding Torch 2B Welding Wire 3 Processing Nozzle 3A Torch Insertion Nozzle 3Aa Opening 3B Gas Injecting Nozzle 3Ba Injecting Port 3C Water Injecting Nozzle 3Ca Water Supply Passage 3Caa Connecting Port 3Cb Cavity 3Cc Nozzle 3Cca Injecting 3Cc Port 3Cd Partition member 3Cda Opening 3Ce Flow resistance member 3D Laser irradiation nozzle 3Da Irradiation port 4 Gas supply part 4A Gas supply pipe 5 Water supply part 5A Water supply pipe 6 Processing head 6A Laser beam 100 Workpiece 100A Processing part C Center axis D Dry spot D1 Passage radial dimension D2 Opening dimension S1 Passage cross-sectional area S2 Opening area WS Water curtain 11 Processing device 12 Processing head 12A Welding torch 12B Welding wire 13 Processing nozzle 13A Torch insertion nozzle 13Aa Open Mouth 13B shield gas injection nozzle 13Ba injection port 13Bb step 13C water injection nozzle 13Ca water supply passage 13Cb annular passage 13Cc nozzle portion 13Cca connection port 13Ccb injection port 13D laser irradiation nozzle 13Da irradiation port 13E assist gas injection nozzle 13Ea gas injection port 14C Supply part 14A Gas supply pipe 15 Water supply part 15A Water supply pipe 16 Processing head 16A Laser beam 17 Flow resistor 17a Base end part 17b Tip part 18 Assist gas supply part 18A Gas supply pipe 19 Shielding member 19a Base end part 19b Tip part 20 Supporting Member 20a Base End 20b Tip 1100 Workpiece 1100A Processing Area D (Da, Db) Dry Spot W Underwater Area

Claims (7)

A gas injection nozzle,
A water injection nozzle formed in an annular shape so as to surround the periphery of the gas injection nozzle;
Equipped with
The water injection nozzle has at least one water supply passage to which water is supplied, an annular cavity to which the water supply passage is connected, and a direction connected to the cavity and extending along the direction of the gas injection nozzle. An annular nozzle portion having a jet port, and a passage cross-sectional area of the cavity is formed larger than an opening area of a connection port of the nozzle portion with the cavity, and a passage radial dimension of the cavity is It is formed to be larger than the opening size of the connection port of the nozzle portion with the cavity ,
For processing, the ratio of the passage cross-sectional area S1 of the cavity to the opening area S2 of the connection port of the cavity in the nozzle portion satisfies the range of 0.01 ≦ S2 / S1 ≦ 0.15 . nozzle. A gas injection nozzle,
A water injection nozzle formed in an annular shape so as to surround the periphery of the gas injection nozzle;
Equipped with
The water injection nozzle has at least one water supply passage to which water is supplied, an annular cavity to which the water supply passage is connected, and a direction connected to the cavity and extending along the direction of the gas injection nozzle. An annular nozzle portion having a jet port, and a passage cross-sectional area of the cavity is formed larger than an opening area of a connection port of the nozzle portion with the cavity, and a passage radial dimension of the cavity is It is formed to be larger than the opening size of the connection port of the nozzle portion with the cavity ,
A processing nozzle, wherein a partition member is provided between a connection opening of the water supply passage with the cavity and a connection opening of the nozzle with the cavity . A gas injection nozzle,
A water injection nozzle formed in an annular shape so as to surround the periphery of the gas injection nozzle;
Equipped with
The water injection nozzle has at least one water supply passage to which water is supplied, an annular cavity to which the water supply passage is connected, and a direction connected to the cavity and extending along the direction of the gas injection nozzle. An annular nozzle portion having a jet port, and a passage cross-sectional area of the cavity is formed larger than an opening area of a connection port of the nozzle portion with the cavity, and a passage radial dimension of the cavity is It is formed to be larger than the opening size of the connection port of the nozzle portion with the cavity ,
A processing nozzle, wherein a flow resistance member is provided between a connection opening of the water supply passage with the cavity and a connection opening of the nozzle with the cavity . A gas injection nozzle,
A water injection nozzle formed in an annular shape so as to surround the periphery of the gas injection nozzle;
Equipped with
The water injection nozzle has at least one water supply passage to which water is supplied, an annular cavity to which the water supply passage is connected, and a direction connected to the cavity and extending along the direction of the gas injection nozzle. An annular nozzle portion having a jet port, and a passage cross-sectional area of the cavity is formed larger than an opening area of a connection port of the nozzle portion with the cavity, and a passage radial dimension of the cavity is It is formed to be larger than the opening size of the connection port of the nozzle portion with the cavity ,
The gas injection nozzle may further include a flow resistor, which has a cylindrical open end and serves as a flow resistance of the gas while allowing the gas to pass through the inside and the outside, and wherein the gas injection nozzle has an injection port as an opening at the tip of the flow resistance. And a processing nozzle which is arranged so as to surround the periphery of the flow resistance body . The processing nozzle according to claim 1 or 4 , wherein an opening direction of a connection port of the water supply passage with the cavity is provided so as to deviate from a connection port of the nozzle portion with the cavity. The processing nozzle according to any one of claims 1 to 5, wherein the nozzle portion is formed such that a cross-sectional area thereof is gradually reduced from a connection port with the cavity toward an injection port of the nozzle unit. A processing nozzle according to any one of claims 1 to 6 ,
A gas supply unit for supplying gas to the gas injection nozzle,
A water supply unit for supplying water to the water supply passage of the water injection nozzle,
A processing head provided as a processing area in the gas injection area of the gas injection nozzle,
A processing device comprising:

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