JP6924715B2 - Laser processing nozzle and laser processing equipment - Google Patents

Description

The present invention relates to a laser processing nozzle for irradiating a member to be cut with a laser, and a laser cutting device provided with the nozzle for laser processing to melt and cut the member to be cut.

When the member to be cut is irradiated with a laser for cutting, it is necessary to blow off the molten member by injecting an assist gas before the member melted by the laser irradiation cools and hardens. A conventional nozzle for laser machining is configured by providing a ejection passage for irradiating a laser at the center of the nozzle body and allowing an assist gas to flow. Therefore, while moving the nozzle body, the laser is irradiated to the ejection passage and the assist gas is circulated to irradiate the member to be cut with the laser to melt it, and the assist gas is ejected to the molten portion to blow the molten member. Skip.

Examples of such a laser processing apparatus include those described in the following patent documents.

Japanese Unexamined Patent Publication No. 2015-167970

By the way, when the thickness of the member to be cut is sufficiently thick, when the member to be cut is irradiated with a laser to be melted, a sufficient amount of assist gas is required to blow off the generated molten member. However, in order to inject a large amount of assist gas, it is necessary to supply a large amount of assist gas to the device, and a device for recovering the injected large amount of assist gas is required. There is a problem that it becomes large.

An object of the present invention is to solve the above-mentioned problems, and to provide a laser processing nozzle and a laser processing apparatus capable of stable processing of a member to be machined by smoothly discharging a molten member. do.

The nozzle for laser processing of the present invention for achieving the above object includes a nozzle body, a first nozzle provided along the axial direction of the nozzle body to irradiate a laser beam and eject an assist gas, and one end. It is characterized in that the portion is provided with an auxiliary nozzle that communicates with the assist gas ejection portion of the first nozzle and the other end portion communicates with the assist gas intake portion.

Therefore, the laser beam is irradiated from the first nozzle toward the member to be processed, and the assist gas is ejected around the irradiation position of the laser beam. At this time, a negative pressure acts on the ejection portion of the auxiliary nozzle by the assist gas ejected from the first nozzle, so that the auxiliary nozzle takes in the assist gas from the intake portion by the ejector action and takes in this assist gas from the tip portion. Squirt. Then, since the assist gas is ejected from the first nozzle and the auxiliary nozzle, the molten member in which the member to be processed is melted by the laser beam can be stably and appropriately blown off and discharged. As a result, the amount of assist gas supplied to the first nozzle can be reduced, and the amount of assist gas ejected from the first nozzle and the auxiliary nozzle can be increased. Stable processing of members can be performed.

The laser processing nozzle of the present invention is characterized in that the nozzle body has a cylindrical shape.

Therefore, since the nozzle body has a cylindrical shape, the manufacturability can be improved.

The laser processing nozzle of the present invention is characterized in that the auxiliary nozzle is formed on the nozzle body.

Therefore, since the auxiliary nozzle is formed on the nozzle body, it is possible to suppress the increase in size of the device.

In the laser machining nozzle of the present invention, a tubular member having a tubular shape is arranged on the outer peripheral side of the tip end portion of the nozzle body, and the auxiliary nozzle is formed by the outer peripheral surface of the nozzle body and the inner peripheral surface of the tubular member. It is characterized by being done.

Therefore, since the auxiliary nozzle is formed by the tubular member arranged on the outer peripheral side of the nozzle body, it is possible to suppress the increase in manufacturing cost by minimizing the modification of the nozzle body.

The laser processing nozzle of the present invention is characterized in that a confluence portion of an assist gas ejected from the first nozzle and an assist gas ejected from the auxiliary nozzle is provided at the tip of the nozzle body.

Therefore, since the merging portion is provided at the tip of the nozzle body, the assist gas can be effectively ejected from the auxiliary nozzle by the ejector action of the assist gas ejected from the first nozzle.

In the nozzle for laser processing of the present invention, the first nozzle is provided at the center position of the nozzle body along the axial direction, and has a rubberal shape along the axial direction at a position deviated from the center position of the nozzle body. It is characterized in that a second nozzle for ejecting an assist gas is provided.

Therefore, the laser beam is irradiated from the first nozzle toward the member to be processed, and the assist gas is ejected from the second nozzle at a position adjacent to the irradiation position of the laser beam. The assist gas is ejected from the second nozzle, which has a rubberal shape, and is accelerated to supersonic speed. Therefore, the molten member whose workpiece is melted by the laser beam is stably and accurately blown off and discharged. can do.

Further, the nozzle for laser processing of the present invention includes a nozzle body, a first nozzle provided on the nozzle body along the axial direction and passing laser light, and a position deviated from the first nozzle along the axial direction. A second nozzle provided to eject the assist gas, and an auxiliary nozzle having one end communicating with the assist gas ejection portion of the second nozzle and the other end communicating with the assist gas intake portion are provided. It is characterized by.

Therefore, the laser beam is irradiated from the first nozzle toward the member to be processed, and the assist gas is ejected from the second nozzle at a position adjacent to the irradiation position of the laser beam. At this time, a negative pressure acts on the ejection portion of the auxiliary nozzle by the assist gas ejected from the second nozzle, so that the auxiliary nozzle takes in the assist gas from the intake portion by the ejector action and takes in this assist gas from the tip portion. Squirt. Then, since the assist gas is ejected from the second nozzle and the auxiliary nozzle, the molten member in which the member to be processed is melted by the laser beam can be stably and appropriately blown off and discharged. As a result, the amount of assist gas supplied to the second nozzle can be reduced, and the amount of assist gas ejected from the second nozzle and the auxiliary nozzle can be increased. Stable processing of members can be performed.

In the nozzle for laser processing of the present invention, the nozzle body has a cylindrical shape, the first nozzle is provided at the center position of the nozzle body, and the second nozzle is displaced from the center position of the nozzle body. It is provided at a position, and the first nozzle and the second nozzle are arranged along the radial direction of the nozzle body.

Therefore, since the first nozzle for passing the laser beam is provided in the center of the nozzle body and the second nozzle for ejecting the assist gas is provided so as to be offset from the center position of the nozzle body, the processing accuracy by the laser beam can be improved. , It is possible to improve the discharge property of the molten member by the assist gas.

The laser processing nozzle of the present invention is characterized in that the auxiliary nozzle is formed on the nozzle body.

Therefore, since the auxiliary nozzle is formed on the nozzle body, it is possible to suppress the increase in size of the device.

In the nozzle for laser machining of the present invention, the nozzle body is provided with a notch on the outer peripheral portion of the tip adjacent to the second nozzle, and the cover member is fixed to the notch to form the auxiliary nozzle. It is characterized by that.

Therefore, since the auxiliary nozzle is formed by the cover member fixed to the notch of the nozzle body, it is possible to suppress the increase in manufacturing cost by minimizing the modification of the nozzle body.

The laser processing nozzle of the present invention is characterized in that a confluence portion of an assist gas ejected from the second nozzle and an assist gas ejected from the auxiliary nozzle is provided at the tip end portion of the nozzle body.

Therefore, since the merging portion is provided at the tip of the nozzle body, the assist gas can be effectively ejected from the auxiliary nozzle by the ejector action of the assist gas ejected from the second nozzle.

In the laser processing nozzle of the present invention, the second nozzle is characterized in that it has a rubberal shape.

Therefore, the laser beam is irradiated from the first nozzle toward the member to be processed, and the assist gas is ejected from the second nozzle at a position adjacent to the irradiation position of the laser beam. The assist gas is ejected from the second nozzle, which has a rubberal shape, and is accelerated to supersonic speed. Therefore, the molten member whose workpiece is melted by the laser beam is stably and accurately blown off and discharged. can do.

In the nozzle for laser processing of the present invention, the second nozzle is characterized in that the inner diameter of the first nozzle and the second nozzle in the arrangement direction or in the direction intersecting the arrangement direction fluctuates in the axial direction.

Therefore, if the inner diameter of the second nozzle in the direction intersecting the arrangement direction of the first nozzle and the second nozzle is changed in the axial direction, the interference between the first nozzle and the second nozzle is eliminated and the second nozzle has an optimum rubberal shape. Can be set to. Further, by varying the inner diameter in the axial direction in the arrangement direction of the first nozzle and the second nozzle in the second nozzle, the second nozzle having a rubberal shape can be easily formed.

In the laser processing nozzle of the present invention, the first nozzle is characterized in that it has a rubberal shape and ejects an assist gas.

Therefore, since the first nozzle has a rubberal shape, the assist gas can be ejected from the first nozzle at supersonic speed, and the molten member can be efficiently discharged.

Further, the laser processing apparatus of the present invention is characterized by including the laser processing nozzle.

Therefore, it is possible to reduce the amount of assist gas to be supplied and increase the amount of assist gas to be ejected, and it is possible to stably process the member to be processed by smoothly discharging the molten member.

According to the laser processing nozzle and the laser processing apparatus of the present invention, stable processing of the member to be machined can be performed by smoothly discharging the molten member.

FIG. 1 is a schematic configuration diagram showing the laser processing apparatus of the first embodiment. FIG. 2 is a perspective view showing the laser machining nozzle of the first embodiment. FIG. 3 is a cross-sectional view taken along the line III-III of FIG. 2 showing a cross section of the laser machining nozzle. FIG. 4 is an IV-IV cross-sectional view of FIG. 3 showing a cross section of a laser machining nozzle. FIG. 5 is a schematic configuration diagram showing the laser processing apparatus of the second embodiment. FIG. 6 is a perspective view showing the laser machining nozzle of the third embodiment. FIG. 7 is a sectional view taken along line VII-VII of FIG. 6 showing a cross section of the laser machining nozzle. FIG. 8 is a cross-sectional view taken along the line VIII-VIII of FIG. 6 showing a cross section of the laser machining nozzle. FIG. 9 is a cross-sectional view taken along the line IX-IX of FIG. 6 showing a cross section of the laser machining nozzle. FIG. 10 is a perspective view showing the laser machining nozzle of the fourth embodiment. FIG. 11 is a cross-sectional view taken along the line XI-XI of FIG. 10 showing a cross section of the laser machining nozzle. FIG. 12 is a cross-sectional view taken along the line XII-XII of FIG. 10 showing a cross section of the laser machining nozzle. FIG. 13 is a cross-sectional view taken along the line XIII-XIII of FIG. 10 showing a cross section of the laser machining nozzle. FIG. 14 is a perspective view showing the laser machining nozzle of the fifth embodiment. FIG. 15 is an XV-XV cross-sectional view of FIG. 14 showing a cross section of a laser machining nozzle. FIG. 16 is a cross-sectional view taken along the line XVI-XVI of FIG. 14 showing a cross section of the laser machining nozzle. FIG. 17 is a cross-sectional view of XVII-XVII of FIG. 16 showing a cross section of a laser machining nozzle.

Hereinafter, preferred embodiments of the laser processing nozzle and the laser processing apparatus according to the present invention will be described in detail with reference to the accompanying drawings. The present invention is not limited to this embodiment, and when there are a plurality of embodiments, the present invention also includes a combination of the respective embodiments.

[First Embodiment]
FIG. 1 is a schematic configuration diagram showing the laser processing apparatus of the present embodiment.

In the first embodiment, as shown in FIG. 1, the laser processing device 10 cuts a member to be cut (member to be machined) A, and includes a laser processing nozzle 11, a laser beam irradiating device 12, and a laser beam irradiating device 12. It is provided with an assist gas supply device 13.

The laser processing nozzle 11 is mounted on a laser processing head (not shown), and includes a nozzle body 20, a first nozzle 21 through which the laser beam L and the assist gas G1 pass through the center position of the nozzle body 20, and a nozzle. An auxiliary nozzle 22 through which the assist gas G2 passes is provided at a position deviated in the radial direction from the center position of the main body 20.

The laser light irradiating device 12 can irradiate the first nozzle 21 of the laser processing nozzle 11 with the laser light (laser beam) L. The assist gas supply device 13 can supply the assist gas G1 to the first nozzle 21 of the laser processing nozzle 11. The auxiliary nozzle 22 of the laser processing nozzle 11 can take in ambient air as the assist gas G2 by the ejector action of the assist gas G1 ejected from the first nozzle 21 and inject it.

FIG. 2 is a perspective view showing the laser machining nozzle of the first embodiment, FIG. 3 is a cross-sectional view of III-III of FIG. 2 showing a cross section of the laser machining nozzle, and FIG. 4 is a cross section of the laser machining nozzle. FIG. 3 is a sectional view taken along line IV-IV of FIG.

The laser processing nozzle 11 has a nozzle body 20, a first nozzle 21, and an auxiliary nozzle 22. The nozzle body 20 has a cylindrical shape, and a first nozzle 21 is provided inside along the axial direction Z, and an auxiliary nozzle 22 is provided around the first nozzle 21. In the nozzle body 20, the tip of the first nozzle 21 and the auxiliary nozzle 22 opens at the front end 20a in the axial direction Z, the rear end of the first nozzle 21 opens at the rear end 20b in the axial direction Z, and the laser It is fixed to a processing head (not shown), and the rear end portion of the auxiliary nozzle 22 is opened in the outer peripheral portion 20c.

The first nozzle 21 and the auxiliary nozzle 22 are arranged so as to be substantially parallel to each other along the axial direction Z of the nozzle body 20. Then, the auxiliary nozzle 22 is arranged on the outer side of the first nozzle 21 in the radial direction. At this time, the first nozzle 21 and the auxiliary nozzle 22 are located concentrically with the center O1 of the nozzle body 20.

The first nozzle 21 is formed concentrically with the center O1 of the nozzle body 20 along the axial direction Z, and has a perfect circular shape. The first nozzle 21 has a first passage 31 located on the front end portion 20a side of the nozzle body 20 and a second passage 32 located on the rear end portion 20b side of the nozzle body 20. The first passage 31 has a constant inner diameter along the axial direction Z and has the same diameter. The second passage 32 has a tapered shape in which the inner diameter gradually decreases toward the front end portion 20a in the axial direction Z. The first nozzle 21 allows the laser beam to pass from the second passage 32 to the first passage 31, and allows the assist gas to pass through and eject from the front end portion.

The auxiliary nozzle 22 is formed concentrically with the center O1 of the nozzle body 20 along the axial direction Z, and has a cylindrical shape. The auxiliary nozzle 22 has a first passage 33 located on the front end portion 20a side of the nozzle body 20 and a second passage 34 located on the outer peripheral portion 20c side of the nozzle body 20. The first passage 33 has a cylindrical shape and is parallel to the first nozzle 21. The second passage 34 has a conical shape in which the rear end portion 20b side of the nozzle body 20 extends outward in the radial direction. In the second passage 34, the front end portion communicates with the rear end portion of the first passage 33, and the rear end portion opens to the outer peripheral portion 20c of the nozzle body 20 via a plurality of openings (incorporation portions) 35. ..

The front end surface 21a of the first nozzle 21 and the front end surface 22a of the auxiliary nozzle 22 are provided at the same positions in the axial direction Z of the nozzle body 20. Further, the front end of the auxiliary nozzle 22 communicates with the ejection portion of the assist gas G1 in the first nozzle 21, and the front end surface 21a of the first nozzle 21 and the front end surface 22a of the auxiliary nozzle 22 are the front ends of the nozzle body 20. The merging portion 36 is provided by being provided so as to be offset from the portion 20a toward the rear end portion 20b in the axial direction Z.

Therefore, as shown in FIGS. 1 and 3, the laser processing nozzle 11 is moved in the arrow T direction by a moving device (not shown). At this time, the laser beam irradiating device 12 irradiates the laser beam L toward the surface A1 of the member A to be cut through the first nozzle 21 of the laser processing nozzle 11. Further, the assist gas supply device 13 ejects the assist gas G1 around the irradiation position of the laser beam L on the surface A1 of the member A to be cut through the first nozzle 21 of the laser processing nozzle 11. At this time, a negative pressure acts on the first passage 33 of the auxiliary nozzle 22 via the merging portion 36 by the assist gas G1 ejected from the front end portion of the first passage 31 of the first nozzle 21. Then, the auxiliary nozzle 22 takes in the outside air as the assist gas G2 into the second passage 34 through the opening 35 by the ejector action, and ejects the external air from the first passage 33 around the assist gas G1.

Then, the member A to be cut is melted from the surface A1 by the laser beam L, and the assist gas G1 ejected from the first nozzle 21 and the assist gas G2 ejected from the auxiliary nozzle 22 surround the irradiation position of the laser beam L. When a certain molten member is blown off and discharged, the tip of the first nozzle 21 is prevented from being blocked. Further, in the member A to be cut, the molten member located downstream of the irradiation position of the laser beam L in the moving direction of the laser processing nozzle 11 is blown off by the assist gases G1 and G2 ejected from the first nozzle 21 and the auxiliary nozzle 22. Is discharged.

As described above, in the nozzle for laser processing of the first embodiment, the nozzle body 20 and the first nozzle 21 provided along the axial direction Z of the nozzle body 20 to irradiate the laser beam and eject the assist gas. An auxiliary nozzle 22 is provided, one end of which communicates with the assist gas ejection portion of the first nozzle 21 and the other end of which communicates with the assist gas opening 35.

Therefore, the laser beam is irradiated from the first nozzle 21 toward the member A to be cut, and the assist gas is ejected around the irradiation position of the laser beam. At this time, a negative pressure acts on the ejection portion of the auxiliary nozzle 22 by the assist gas ejected from the first nozzle 21, so that the auxiliary nozzle 22 takes in the assist gas from the opening 35 by the ejector action, and this assist gas is taken in from the front end portion. Eject assist gas. Then, since the assist gas is ejected from the first nozzle 21 and the auxiliary nozzle 22, the molten member in which the member A to be cut is melted by the laser beam can be stably and appropriately blown off and discharged. As a result, the amount of assist gas supplied to the first nozzle 21 can be reduced, and the amount of assist gas ejected from the first nozzle 21 and the auxiliary nozzle 22 can be increased, so that the molten member can be smoothly discharged. It is possible to perform stable machining of the member to be machined. Further, if the amount of assist gas supplied to the first nozzle 21 can be reduced, the amount of assist gas recovered after use can be reduced.

In the laser machining nozzle of the first embodiment, the nozzle body 20 has a cylindrical shape. Therefore, since the nozzle body 20 has a cylindrical shape, the manufacturability can be improved.

In the laser processing nozzle of the first embodiment, the auxiliary nozzle 22 is formed on the nozzle body 20. Therefore, it is possible to suppress the increase in size of the device.

In the laser machining nozzle of the first embodiment, the front end portion 20a of the nozzle body 20 is provided with a confluence portion 36 of the assist gas ejected from the first nozzle 21 and the assist gas ejected from the auxiliary nozzle 22. Therefore, the assist gas can be effectively ejected from the auxiliary nozzle 22 by the ejector action of the assist gas ejected from the first nozzle 21.

[Second Embodiment]
FIG. 5 is a schematic configuration diagram showing the laser processing apparatus of the second embodiment. Members having the same functions as those in the above-described embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

In the second embodiment, as shown in FIG. 5, the laser processing device 10A includes a laser processing nozzle 11A, a laser light irradiation device 12, and an assist gas supply device 13.

The laser light irradiating device 12 can irradiate the first nozzle 41 of the laser processing nozzle 11A with the laser light L. The assist gas supply device 13 can supply the assist gas G1 to the first nozzle 21 of the laser processing nozzle 11A. The auxiliary nozzle 42 of the laser processing nozzle 11A can take in the surrounding air as the assist gas G2 by the ejector action of the assist gas G1 ejected from the first nozzle 41 and inject it.

The laser processing nozzle 11A has a nozzle body 40, a first nozzle 41, and an auxiliary nozzle 42. The nozzle body 40 has a cylindrical shape, and a first nozzle 41 is provided inside along the axial direction Z, and an auxiliary nozzle 42 is provided around the first nozzle 41. In the nozzle body 40, the front end portion 20a in the axial direction Z is opened with the tip portions of the first nozzle 41 and the auxiliary nozzle 42, and the rear end portion 40b in the axial direction Z is opened with the rear end portion of the first nozzle 41. It is fixed to a processing head (not shown), and the rear end portion of the auxiliary nozzle 42 is opened in the outer peripheral portion 40c.

The first nozzle 41 and the auxiliary nozzle 42 are arranged so as to be substantially parallel to each other along the axial direction Z of the nozzle body 40. Then, the auxiliary nozzle 42 is arranged on the outer side of the first nozzle 41 in the radial direction. At this time, the first nozzle 41 and the auxiliary nozzle 42 are located concentrically with the center O1 of the nozzle body 40.

The first nozzle 41 is formed concentrically with the center O1 of the nozzle body 40 along the axial direction Z, and has a perfect circular shape. The first nozzle 41 has a first passage 51 located on the front end portion 20a side of the nozzle body 40 and a second passage 52 located on the rear end portion 40b side of the nozzle body 40. The first passage 51 has a constant inner diameter along the axial direction Z and has the same diameter. The second passage 52 has a tapered shape in which the inner diameter gradually decreases toward the front end portion 40a in the axial direction Z. The first nozzle 41 is capable of passing laser light from the second passage 52 toward the first passage 51, and is capable of passing the assist gas and ejecting from the front end portion.

The nozzle body 40 is provided with an inclined surface 40d having a tapered shape toward the front end portion 40a on the outer peripheral portion 40c. The cylindrical member 53 is arranged on the outer peripheral side of the inclined surface 40d of the nozzle body 40 with a predetermined gap. The cylindrical member 53 has a truncated cone shape in which the front end portion 40a of the nozzle body 40 is tapered, and is supported by a plurality of support members 54 on the inclined surface 40d of the nozzle body 40. An auxiliary nozzle 42 is formed between the outer peripheral surface of the nozzle body 40 and the inner peripheral surface of the cylindrical member 53.

The auxiliary nozzle 42 is formed concentrically with the center O1 of the nozzle body 40 along the axial direction Z, and has a cylindrical shape. The auxiliary nozzle 42 has a first passage 55 between the inclined surface of the front end portion 40a of the nozzle body 40 and the inner surface of the cylindrical member 53. The first passage 55 has a cylindrical shape and has a predetermined inclination angle with respect to the first nozzle 21. In the first passage 55, the front end portion opens to the front end portion 40a of the nozzle body 40, and the rear end portion opens to the outer peripheral portion 40c of the nozzle body 40.

The front end portion 40a of the nozzle body 40 is provided so as to be offset from the front end portion 53a of the cylindrical member 53 toward the rear end portion 40b in the axial direction Z, so that the merging portion 56 is provided.

Therefore, the laser beam irradiating device 12 irradiates the laser beam L toward the surface A1 of the member A to be cut through the first nozzle 41 of the laser processing nozzle 11A. Further, the assist gas supply device 13 ejects the assist gas G1 around the irradiation position of the laser beam L on the surface A1 of the member A to be cut through the first nozzle 41 of the laser processing nozzle 11A. At this time, a negative pressure acts on the first passage 55 of the auxiliary nozzle 42 via the merging portion 56 by the assist gas G1 ejected from the front end portion of the first passage 51 of the first nozzle 41. Then, the auxiliary nozzle 42 takes in the outside air as the assist gas G2 into the first passage 55 by the ejector action, and ejects the outside air from the first passage 55 to the periphery of the assist gas G1.

Then, the member A to be cut is melted from the surface A1 by the laser beam L, and the assist gas G1 ejected from the first nozzle 41 and the assist gas G2 ejected from the auxiliary nozzle 42 surround the irradiation position of the laser beam L. When a certain molten member is blown off and discharged, the tip of the first nozzle 41 is prevented from being blocked. Further, in the member A to be cut, the molten member located downstream of the irradiation position of the laser beam L in the moving direction of the laser processing nozzle 11A is blown off by the assist gases G1 and G2 ejected from the first nozzle 41 and the auxiliary nozzle 42. Is discharged.

As described above, in the nozzle for laser processing of the second embodiment, a cylindrical member 53 having a cylindrical shape is arranged on the outer peripheral side of the front end portion 40a of the nozzle body 40, and the outer peripheral surface of the nozzle body 40 and the cylindrical member 53 are arranged. The auxiliary nozzle 42 is formed by the inner peripheral surface.

Therefore, since the auxiliary nozzle 42 is formed by the cylindrical member 53 arranged on the outer peripheral side of the nozzle body 40, it is possible to suppress the increase in manufacturing cost by minimizing the modification of the nozzle body 40.

[Third Embodiment]
6 is a perspective view showing the laser processing nozzle of the third embodiment, FIG. 7 is a cross-sectional view of VII-VII of FIG. 6 showing a cross section of the laser processing nozzle, and FIG. 8 is a cross section of the laser processing nozzle. FIG. 6 is a cross-sectional view taken along the line VIII-VIII of FIG. 6, and FIG. 9 is a cross-sectional view taken along the line IX-IX of FIG. 6 showing a cross section of the nozzle for laser processing. Members having the same functions as those in the above-described embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

In the third embodiment, as shown in FIGS. 6 to 9, the laser processing nozzle 11B has a nozzle body 20, a first nozzle 61, a second nozzle 62, and an auxiliary nozzle 63. The nozzle body 20 has a cylindrical shape, and a first nozzle 61, a second nozzle 62, and an auxiliary nozzle 63 are provided inside along the axial direction Z. In the nozzle body 20, the first nozzle 61, the second nozzle 62, and the front end portion of the auxiliary nozzle 63 are opened at the front end portion 20a in the axial direction Z, and the first nozzle 61 and the second nozzle are opened at the rear end portion 20b in the axial direction Z. The rear end portion of 62 is open and fixed to a laser processing head (not shown), and the rear end portion of the auxiliary nozzle 63 is open to the outer peripheral portion 20c.

The first nozzle 61 and the second nozzle 62 are arranged so as to be substantially parallel to each other along the axial direction Z of the nozzle body 20. The first nozzle 61 and the second nozzle 62 are arranged along the first radial direction X of the nozzle body 20. At this time, the first nozzle 61 is located at the center O1 of the nozzle body 20, and the second nozzle 62 is located at the center O2 deviated from the center O1 of the nozzle body 20 to one side of the first radial direction X. When the laser machining nozzle 11B is fixed to the laser machining head (not shown), the second nozzle 62 is arranged so as to be located on the downstream side in the moving direction (cutting direction). On the other hand, the auxiliary nozzle 63 is arranged outside the second nozzle 62 in the radial direction.

The first nozzle 61 is formed concentrically with the center O1 of the nozzle body 20 along the axial direction Z, and has a perfect circular shape. The first nozzle 61 has a first passage 71 located on the front end portion 20a side of the nozzle body 20, and a second passage 72 located on the rear end portion 20b side of the nozzle body 20. The first passage 71 has a constant inner diameter along the axial direction Z and has the same diameter. The second passage 72 has a tapered shape in which the inner diameter gradually decreases toward the front end portion 20a in the axial direction Z. The first nozzle 61 is capable of passing laser light from the second passage 72 toward the first passage 71, and is capable of passing the assist gas and ejecting from the front end portion.

The second nozzle 62 is formed along the axial direction Z at the position of the center O2 deviated from the center O1 of the nozzle body 20 to one side in the radial direction, and has a rectangular shape long in the first radial direction X. The second nozzle 62 has a rubberal shape. In this case, the second nozzle 62 has a rubberal shape because the inner diameter of the second radial direction Y intersecting the first radial direction X where the first nozzle 61 and the second nozzle 62 are arranged fluctuates in the axial direction Z. ing.

That is, the second nozzle 62 includes a first passage 73 located on the front end portion 20a side of the nozzle body 20, a second passage 74 located between the front end portion 20a and the rear end portion 20b of the nozzle body 20, and the nozzle body. It has a third passage 75 located on the rear end portion 20b side of the 20. As shown in FIG. 7, in the first passage 73, the second passage 74, and the third passage 75, the inner diameter dimension of the first radial direction X in which the first nozzle 61 and the second nozzle 62 are arranged is constant in the axial direction Z. It has the same diameter. The center O2 of the second nozzle 62 is inclined toward the rear end 20b of the nozzle body 20 toward the outer peripheral side of the nozzle body 20, but the center O2 is centered O1 according to the shape of the first nozzle 61. It may be made parallel.

On the other hand, as shown in FIG. 9, in the first passage 73, the inner diameter dimension of the second radial direction Y intersecting (orthogonal) with the first radial direction X in which the first nozzle 61 and the second nozzle 62 are arranged is the axial direction Z. It has a thick tip shape with a large diameter toward the front end 20a side of the. The inner diameter of the second passage 74 in the second radial direction Y is constant in the axial direction Z and has the same diameter. The third passage 75 has a tapered shape in which the inner diameter dimension in the second radial direction Y becomes smaller toward the front end portion 20a side in the axial direction Z. That is, the second nozzle 62 is in the second radial direction intersecting the first radial direction X in which the first nozzle 61 and the second nozzle 62 are arranged from the rear end portion 20b side to the front end portion 20a side of the nozzle body 20. Y has a tapered shape in the third passage 75, a narrowed shape in the second passage 74, and a tapered shape in the first passage 73. Then, the second nozzle 62 can eject the assist gas.

As shown in FIG. 7, the front end surface 61a of the first nozzle 61 and the front end surface 62a of the second nozzle 62 are provided at the same positions in the axial direction Z of the nozzle body 20. The passage area of the tip of the second nozzle 62 is set to be smaller than the passage area of the tip of the first nozzle 61. In this case, the second nozzle 62 preferably has the length of the second radial direction Y set shorter than the length of the first radial direction X, but the length of the first radial direction X is set very long. By doing so, the passage area of the tip portion of the second nozzle 62 may be set to be larger than the passage area of the tip portion of the first nozzle 61. Further, it is preferable that the length of the second nozzle 62 in the second radial direction Y is set to substantially the same diameter as the outer diameter of the laser beam L.

The auxiliary nozzle 63 has two first passages 76 formed on both sides of the second nozzle 62 in the second radial direction Y in the nozzle body 20. The first passage 76 of the auxiliary nozzle 63 is arranged so as to be inclined with respect to the second nozzle 62. In the first passage 76, the front end portion communicates with the first passage 73 of the second nozzle 62, and the rear end portion opens (take-in portion) in the outer peripheral portion 20c of the nozzle body 20. The first passage 76 is provided radially from the rear end portion toward the front end portion so as to incline toward the first passage 73 of the second nozzle 62, and is provided at the rear end by a predetermined distance from the front end surface 62a of the second nozzle 62. It is communicated to the department side. Therefore, in the auxiliary nozzle 63, the front end portion of the first passage 76 communicates with the ejection portion of the assist gas in the second nozzle 62, and the merging portion 77 is provided here.

Therefore, as shown in FIGS. 6 to 9, when the laser processing nozzle 11B moves in the direction of the arrow T, the laser beam is emitted from the first nozzle 61 and the assist gas is emitted around the irradiation position of the laser beam. It is ejected. This assist gas is accelerated to the speed of sound in the tapered second passage 72 and ejected from the tip of the first passage 71. At this time, the assist gas is ejected from the second nozzle 62 to the downstream side in the moving direction T of the laser processing nozzle 11B from the irradiation position of the laser beam. This assist gas is accelerated by the tapered third passage 75 to reach the speed of sound in the second passage 74, and is further accelerated to supersonic speed in the tapered first passage 73 of the first passage 73. It is ejected from the tip.

At this time, a negative pressure acts on the first passage 76 of the auxiliary nozzle 63 via the merging portion 77 by the assist gas ejected from the front end portion of the first passage 73 of the second nozzle 62. Then, the auxiliary nozzle 63 takes in the outside air as an assist gas into the first passage 76 by the ejector action, and ejects the assist gas from the first passage 76. The member to be cut is melted by the laser beam, and the molten member around the irradiation position of the laser beam is blown off by the assist gas ejected from the first nozzle 61, thereby preventing the tip of the first nozzle 61 from being blocked. NS. Further, the supersonic assist gas ejected from the second nozzle 62 and the auxiliary nozzle 63 blows off the molten member on the downstream side of the moving direction T of the laser processing nozzle 11B from the irradiation position of the laser beam and discharges the molten member.

As described above, in the nozzle for laser processing of the third embodiment, the nozzle body 60, the first nozzle 61 provided on the nozzle body 20 along the axial direction Z and passing the laser light, and the first nozzle 61 A second nozzle 62 that is provided along the axial direction Z at a position deviated from the first radial direction X and one end communicates with the assist gas ejection portion of the second nozzle 62 and the other end. Is provided with an auxiliary nozzle 63 that opens to the outer peripheral portion 20c of the nozzle body 20.

Therefore, the laser beam is irradiated from the first nozzle 61 toward the member to be cut, and the assist gas is ejected from the second nozzle 62 at a position adjacent to the irradiation position of the laser beam. At this time, a negative pressure acts on the ejection portion of the auxiliary nozzle 63 by the assist gas ejected from the second nozzle 62, so that the auxiliary nozzle 63 takes in the assist gas from the outside by the ejector action and this assist gas is taken from the front end portion. Squirt. Then, since the assist gas is ejected from the second nozzle 62 and the auxiliary nozzle 63, the molten member in which the member to be cut is melted by the laser beam can be stably and appropriately blown off and discharged. As a result, the amount of assist gas supplied to the second nozzle 62 can be reduced, and the amount of assist gas ejected from the second nozzle 62 and the auxiliary nozzle 63 can be increased, so that the molten member can be smoothly discharged. It is possible to perform stable machining of the member to be machined.

In the nozzle for laser processing of the third embodiment, the nozzle body 60 has a cylindrical shape, the first nozzle 61 is provided at the center O1 of the nozzle body 60, and the second nozzle 62 is located at the center O2 deviated from the center O1 of the nozzle body 60. The first nozzle 61 and the second nozzle 62 are provided and arranged along the first radial direction X of the nozzle body 60. Therefore, since the first nozzle 61 for passing the laser beam is provided at the center O1 of the nozzle body 60 and the second nozzle 62 for ejecting the assist gas is provided at the center O2 deviated from the center O1 of the nozzle body 60, processing by the laser beam is performed. The accuracy can be improved, and the discharge property of the molten member by the assist gas can be improved.

In the laser machining nozzle of the third embodiment, the auxiliary nozzle 63 is formed in the nozzle body 20. Therefore, it is possible to suppress the increase in size of the device.

In the laser machining nozzle of the third embodiment, the front end portion 20a of the nozzle body 20 is provided with a confluence portion 77 of the assist gas ejected from the second nozzle 62 and the assist gas ejected from the auxiliary nozzle 63. Therefore, since the merging portion 77 is provided at the front end portion 20a of the nozzle body 20, the assist gas can be effectively ejected from the auxiliary nozzle 63 by the ejector action of the assist gas ejected from the second nozzle 62.

In the laser machining nozzle of the third embodiment, the second nozzle 62 has a rubberal shape. Therefore, the laser beam is irradiated from the first nozzle 61 toward the member to be cut, and the assist gas is ejected from the second nozzle 62 at a position adjacent to the irradiation position of the laser beam. Since the assist gas is ejected from the second nozzle 62 having a rubberal shape, it is accelerated to supersonic speed and ejected. Therefore, the molten member in which the member to be cut is melted by the laser beam is stably and accurately blown off. Can be discharged.

In the laser processing nozzle of the third embodiment, in the second nozzle, the inner diameter of the radial direction X where the first nozzle 61 and the second nozzle 62 are arranged or the radial direction Y intersecting the radial direction X varies in the axial direction Z. ing. Therefore, if the inner diameter of the radial direction Y of the second nozzle 62 is changed in the axial direction, the interference between the first nozzle 61 and the second nozzle 62 can be eliminated and the second nozzle 62 can be set to the optimum rubberal shape. Further, if the inner diameter of the second nozzle 62 in the radial direction X is changed in the axial direction Z, the second nozzle 62 having a rubberal shape can be easily formed.

Further, the laser processing apparatus of the third embodiment includes a laser processing nozzle 11B. Therefore, it is possible to reduce the amount of assist gas to be supplied and increase the amount of assist gas to be ejected, and it is possible to stably process the member to be cut by smoothly discharging the molten member.

[Fourth Embodiment]
10 is a perspective view showing the laser processing nozzle of the fourth embodiment, FIG. 11 is a cross-sectional view of XI-XI of FIG. 10 showing a cross section of the laser processing nozzle, and FIG. 12 is a cross section of the laser processing nozzle. FIG. 10 is a cross-sectional view taken along the line XII-XII of FIG. 10, and FIG. 13 is a cross-sectional view taken along the line XIII-XIII of FIG. 10 showing a cross section of the nozzle for laser processing. Members having the same functions as those in the above-described embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

In the fourth embodiment, as shown in FIGS. 10 to 13, the laser processing nozzle 11C has a nozzle body 20, a first nozzle 81, a second nozzle 82, and an auxiliary nozzle 83. The nozzle body 20 has a cylindrical shape, and a first nozzle 81, a second nozzle 82, and an auxiliary nozzle 83 are provided inside along the axial direction Z. In the nozzle body 20, the first nozzle 81, the second nozzle 82, and the front end portion of the auxiliary nozzle 83 are opened at the front end portion 20a in the axial direction Z, and the first nozzle 81 and the second nozzle are opened at the rear end portion 20b in the axial direction Z. The rear end portion of the 82 is opened and fixed to a laser processing head (not shown), and the rear end portion of the auxiliary nozzle 83 is opened at 20c on the outer peripheral portion.

The first nozzle 81 and the second nozzle 82 are arranged so as to be substantially parallel to each other along the axial direction Z of the nozzle body 20. The first nozzle 81 and the second nozzle 82 are arranged along the first radial direction X of the nozzle body 20. At this time, the first nozzle 81 is located at the center O1 of the nozzle body 20, and the second nozzle 82 is located at the center O2 deviated from the center O1 of the nozzle body 20 to one side of the first radial direction X. On the other hand, the auxiliary nozzle 83 is arranged outside the second nozzle 82 in the radial direction.

The first nozzle 81 is formed concentrically with the center O1 of the nozzle body 20 along the axial direction Z, and has a perfect circular shape. The first nozzle 81 has a first passage 91 located on the front end portion 20a side of the nozzle body 20, and a second passage 92 located on the rear end portion 20b side of the nozzle body 20. The first passage 91 has a constant inner diameter along the axial direction Z and has the same diameter. The second passage 92 has a tapered shape in which the inner diameter gradually decreases toward the front end portion 20a in the axial direction Z. The first nozzle 81 is capable of passing laser light from the second passage 92 toward the first passage 91, and is capable of passing the assist gas and ejecting from the front end portion.

The second nozzle 82 is formed along the axial direction Z at the position of the center O2 deviated from the center O1 of the nozzle body 20 to one side in the radial direction, and has a rectangular shape long in the first radial direction X. The second nozzle 82 has a rubberal shape. That is, the second nozzle 82 has a first passage 93 located on the front end portion 20a side of the nozzle body 20, a second passage 94 located between the front end portion 20a and the rear end portion 20b of the nozzle body 20, and the nozzle body. It has a third passage 95 located on the rear end portion 20b side of the 20. As shown in FIG. 11, the first passage 93, the second passage 94, and the third passage 95 have the same inner diameter dimension in the first radial direction X in the axial direction Z.

On the other hand, as shown in FIG. 13, the first passage 93 has a thick tip shape in which the inner diameter dimension in the second radial direction Y becomes larger toward the front end portion 20a side in the axial direction Z. The inner diameter of the second passage 94 in the second radial direction Y is constant in the axial direction Z and has the same diameter. The third passage 95 has a tapered shape in which the inner diameter dimension in the second radial direction Y becomes smaller toward the front end portion 20a side in the axial direction Z. That is, the second nozzle 82 has a tapered shape in the third passage 95 in the second radial direction Y from the rear end portion 20b side to the front end portion 20a side of the nozzle body 20, and has a drawn shape in the second passage 94. Yes, it has a thick tip in the first passage 93. Then, the second nozzle 82 can eject the assist gas.

The nozzle body 20 has a cylindrical shape, and two notches 20d are formed on the outer peripheral portion of the front end. The two notches 20d are formed outside the second radial direction Y of the first passage 93 and the second passage 94 of the second nozzle 82 over 90 degrees in the circumferential direction. The cover member 96 of the nozzle body 20 is fixed to each of the two notches 20d. The cover member 96 has a U-shape and has the same length as the notch 20d, and the auxiliary nozzle 83 is formed by the cover member 96.

The auxiliary nozzle 83 has two first passages 97 formed on both sides of the second nozzle 82 in the second radial direction Y in the nozzle body 20. The first passage 97 of the auxiliary nozzle 83 is formed by a notch 20d of the nozzle body 20 and an inner surface of the cover member 96, and is provided substantially parallel to the second nozzle 82. In the first passage 97, the front end portion communicates with the assist gas ejection portion in the second nozzle 82, the rear end portion opens (take-in portion) in the outer peripheral portion 20c of the nozzle body 20, and the auxiliary nozzle 83 has an auxiliary nozzle 83. A merging portion 98 is provided at a position where the front end portion of the first passage 97 communicates with the ejection portion of the second nozzle 82.

Therefore, as shown in FIGS. 10 to 13, when the laser processing nozzle 11C moves in the direction of the arrow T, the laser beam is emitted from the first nozzle 81 and the assist gas is emitted around the irradiation position of the laser beam. It is ejected. Further, the assist gas is ejected from the second nozzle 82 to the downstream side in the moving direction T of the laser processing nozzle 11C from the irradiation position of the laser beam. At this time, a negative pressure acts on the first passage 97 of the auxiliary nozzle 83 via the merging portion 98 by the assist gas ejected from the front end portion of the first passage 93 of the second nozzle 82. Then, the auxiliary nozzle 83 takes in the outside air as an assist gas into the first passage 97 by the ejector action, and ejects the assist gas from the first passage 97. The member to be cut is melted by the laser beam, and the molten member around the irradiation position of the laser beam is blown off by the assist gas ejected from the first nozzle 61, thereby preventing the tip of the first nozzle 81 from being blocked. NS. Further, the supersonic assist gas ejected from the second nozzle 82 and the auxiliary nozzle 83 blows away the molten member on the downstream side of the moving direction T of the laser processing nozzle 11C from the irradiation position of the laser beam and discharges the molten member.

As described above, in the nozzle for laser machining of the fourth embodiment, the nozzle body 20 is provided with a notch 20d on the outer peripheral portion of the tip adjacent to the second nozzle 82, and the cover member 96 is fixed to the notch 20d. As a result, the auxiliary nozzle 83 is formed.

Therefore, since the auxiliary nozzle 83 is formed by the cover member 96 fixed to the notch 20d of the nozzle body 20, it is possible to suppress the increase in manufacturing cost by minimizing the modification of the nozzle body 20.

[Fifth Embodiment]
14 is a perspective view showing the laser processing nozzle of the fifth embodiment, FIG. 15 is an XV-XV cross-sectional view of FIG. 14 showing a cross section of the laser processing nozzle, and FIG. 16 is a cross section of the laser processing nozzle. FIG. 14 is a cross-sectional view taken along the line XVI-XVI of FIG. 14, and FIG. 17 is a cross-sectional view taken along the line XVII-XVII of FIG. 16 showing a cross section of the nozzle for laser processing. Members having the same functions as those in the above-described embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

In the fifth embodiment, as shown in FIGS. 14 and 17, the laser processing nozzle 11D has a nozzle body 20, a first nozzle 101, a second nozzle 102, and an auxiliary nozzle 103. The nozzle body 20 has a cylindrical shape, and a first nozzle 101, a second nozzle 102, and an auxiliary nozzle 103 are provided inside along the axial direction Z. In the nozzle body 20, the first nozzle 101, the second nozzle 102, and the front end portion of the auxiliary nozzle 103 are opened at the front end portion 20a in the axial direction Z, and the first nozzle 101 and the second nozzle are open at the rear end portion 20b in the axial direction Z. The rear end portion of the 102 is open and fixed to the laser processing head (not shown), and the rear end portion of the auxiliary nozzle 103 is open to the outer peripheral portion 20c.

The first nozzle 101 and the second nozzle 102 are arranged so as to be substantially parallel to each other along the axial direction Z of the nozzle body 20. The first nozzle 101 and the second nozzle 102 are arranged along the first radial direction X of the nozzle body 20. At this time, the first nozzle 101 is located at the center O1 of the nozzle body 20, and the second nozzle 102 is located at the center O2 deviated from the center O1 of the nozzle body 20 to one side of the first radial direction X. On the other hand, the auxiliary nozzle 103 is arranged outside the first nozzle 101 in the radial direction.

The first nozzle 101 is formed concentrically with the center O1 of the nozzle body 20 along the axial direction Z, and has a perfect circular shape. The first nozzle 101 has a first passage 111 located on the front end portion 20a side of the nozzle body 20, and a second passage 112 located on the rear end portion 20b side of the nozzle body 20. The first passage 111 has a constant inner diameter along the axial direction Z and has the same diameter. The second passage 122 has a tapered shape in which the inner diameter gradually decreases toward the front end portion 20a in the axial direction Z. The first nozzle 101 allows the laser beam to pass from the second passage 112 to the first passage 111, and also allows the assist gas to pass through and eject from the front end portion.

The second nozzle 102 is formed along the axial direction Z at the position of the center O2 deviated from the center O1 of the nozzle body 20 to one side in the radial direction, and has a long shape in the radial direction X. The second nozzle 102 has a rubberal shape. That is, the second nozzle 102 includes a first passage 113 located on the front end portion 20a side of the nozzle body 20, a second passage 114 located between the front end portion 20a and the rear end portion 20b of the nozzle body 20, and the nozzle body. It has a third passage 115 located on the rear end portion 20b side of the 20. The first passage 113 has a thick tip shape in which the inner diameter becomes larger toward the front end portion 20a in the axial direction Z. The inner diameter of the second passage 114 is constant in the axial direction Z and has the same diameter. The third passage 115 has a tapered shape in which the inner diameter becomes smaller toward the front end portion 20a in the axial direction Z. That is, the second nozzle 102 has a tapered shape in the third passage 115 in the second radial direction Y from the rear end portion 20b side to the front end portion 20a side of the nozzle body 20, and has a drawn shape in the second passage 114. Yes, the first passage 113 has a thick tip. Then, the second nozzle 102 can eject the assist gas.

The auxiliary nozzle 103 has two first passages 116 formed on both sides of the first passage 111 of the first nozzle 101 in the second radial direction in the nozzle body 20. The first passage 116 of the auxiliary nozzle 103 is arranged so as to be inclined with respect to the first nozzle 101. In the first passage 116, the front end portion communicates with the first passage 111 of the first nozzle 101, and the rear end portion opens (take-in portion) in the outer peripheral portion 20c of the nozzle body 20. The first passage 116 is provided radially from the rear end portion toward the front end portion so as to incline toward the first passage 111 of the first nozzle 101, and is provided at the rear end by a predetermined distance from the front end surface 101a of the first nozzle 101. It is communicated to the department side. Therefore, in the auxiliary nozzle 103, the front end portion of the first passage 116 communicates with the ejection portion of the assist gas in the first nozzle 101, and the merging portion 117 is provided here.

Further, in the laser processing nozzle 11D, a communication portion 121 is provided between the tip end portion of the first nozzle 101 and the tip end portion of the second nozzle 102 in the nozzle body 20. The communication portion 121 is formed by cutting out a partition wall between the tip end portion of the first passage 111 of the first nozzle 101 and the tip end portion of the first passage 113 of the second nozzle 102 in the axial direction Z by a predetermined length. .. The communication portion 121 preferably has a length in the axial direction that does not reach the second passage 114.

Therefore, when the laser processing nozzle 11D moves in the direction of the arrow T, the laser beam is irradiated from the first nozzle 101, and the assist gas is ejected around the irradiation position of the laser beam. This assist gas is accelerated to the speed of sound in the tapered second passage 112 and ejected from the tip of the first passage 111.

Further, the assist gas is ejected from the second nozzle 102 to the downstream side in the moving direction T of the laser processing nozzle 11D from the irradiation position of the laser beam. This assist gas is accelerated by the tapered third passage 115 to reach the speed of sound in the second passage 114, and is further accelerated to supersonic speed in the tapered first passage 113 of the first passage 113. It is ejected from the tip. At this time, 117 negative pressure acts on the merging portion via the communicating portion 121 by the assist gas ejected from the front end portion of the first passage 113 of the second nozzle 102, and the negative pressure of the merging portion 117 is applied to the auxiliary nozzle 103. Negative pressure acts on the first passage 116. Then, the auxiliary nozzle 103 takes in the outside air as an assist gas into the first passage 116 by the ejector action, and ejects the assist gas from the first passage 116. Then, the member to be cut is melted by the laser beam, and the molten member around the irradiation position of the laser beam is blown off by the supersonic assist gas ejected from the first nozzle 101 and the auxiliary nozzle 103, so that the first nozzle Blockage of the front end portion of 101 is prevented. Further, the supersonic assist gas ejected from the second nozzle 102 blows off the molten member on the downstream side of the moving direction T of the laser processing nozzle 11D from the irradiation position of the laser beam and discharges the molten member.

As described above, in the laser machining nozzle of the fifth embodiment, the first nozzle 101 has a rubberal shape, one end communicates with the assist gas ejection portion of the first nozzle 101, and the other end opens to the outside. Auxiliary nozzle 103 is provided.

Therefore, the laser beam is irradiated from the first nozzle 101 toward the member to be cut, and the assist gas is ejected around the irradiation position of the laser beam. At this time, since the second nozzle 102 has a rubberal shape, the assist gas can be ejected from the second nozzle 102 at supersonic speed. Further, a negative pressure acts on the ejection portion of the auxiliary nozzle 103 by the assist gas ejected from the second nozzle 102, so that the auxiliary nozzle 103 takes in the assist gas by the ejector action and ejects the assist gas from the front end portion. .. Then, since the assist gas is ejected from the first nozzle 101 and the auxiliary nozzle 103, the molten member in which the member to be cut is melted by the laser beam can be efficiently discharged.

In the above-described embodiment, the rear end of the auxiliary nozzle is opened to the outer peripheral portion of the nozzle body, but it may be connected to a tank in which air, an inert gas (nitrogen), or the like is stored through a pipe.

Further, in the above-described embodiment, the shape of the injection portion of the second nozzle is rectangular, but it may be a polygon such as a square or a rectangle, or a circle, an oval, an ellipse, or the like. Further, the number of the second nozzles is not limited to one, and a plurality of second nozzles may be provided at predetermined intervals in the first radial direction X.

Further, in the above-described embodiment, the nozzle body has a cylindrical shape, the first nozzle is provided at the center O1 of the nozzle body, and the second nozzle is provided at the center O2 deviated from the center O1 of the nozzle body, but the configuration is limited to this. It is not something that is done. For example, the nozzle body may have an elliptical or oval shape, or a prismatic shape. Further, the first nozzle may be provided so as to be offset from the center O1 of the nozzle body.

10,10A Laser processing device 11, 11A, 11B, 11C, 11D Laser processing nozzle 12 Laser light irradiation device 13 Assist gas supply device 20, 40 Nozzle body 21, 41, 61, 81, 101 First nozzle 22, 42, 63, 83, 103 Auxiliary nozzle 31, 51, 71, 91, 111 1st passage 32, 52, 72, 92, 112 2nd passage 33, 55, 76, 97, 116 1st passage 34 2nd passage 35 opening (Capture section)
36, 56, 77, 98, 117 Confluence 53 Cylindrical member (cylindrical member)
62, 82, 102 2nd nozzle 73, 93, 113 1st passage 74, 94, 114 2nd passage 75, 95, 115 3rd passage 96 Cover member 121 Communication part L Laser light G1, G2 Assist gas A Cut member A1 Surface T Movement direction O1, O2 Center X 1st radial direction Y 2nd radial direction Z axis direction

Claims (14)

Nozzle body and
A first nozzle provided along the axial direction of the nozzle body to irradiate a laser beam and eject an assist gas,
An auxiliary nozzle in which one end communicates with the assist gas ejection portion of the first nozzle and the other end communicates with the assist gas intake portion.
Bei to give a,
The first nozzle is provided at the center position of the nozzle body along the axial direction, and the second nozzle that ejects the assist gas in a rubberal shape along the axial direction at a position deviated from the center position of the nozzle body. Provided,
A nozzle for laser machining that is characterized by this. The laser processing nozzle according to claim 1, wherein the nozzle body has a cylindrical shape. The laser processing nozzle according to claim 1 or 2, wherein the auxiliary nozzle is formed on the nozzle body. The claim is characterized in that a tubular member having a tubular shape is arranged on the outer peripheral side of the tip end portion of the nozzle body, and the auxiliary nozzle is formed by an outer peripheral surface of the nozzle body and an inner peripheral surface of the tubular member. 1 or the nozzle for laser machining according to claim 2. Any one of claims 1 to 4, wherein a confluence portion of the assist gas ejected from the first nozzle and the assist gas ejected from the auxiliary nozzle is provided at the tip end portion of the nozzle body. Nozzle for laser processing described in the section. Nozzle body and
A first nozzle provided on the nozzle body along the axial direction and passing a laser beam,
A second nozzle provided along the axial direction at a position deviated from the first nozzle and ejecting an assist gas, and a second nozzle.
An auxiliary nozzle in which one end communicates with the assist gas ejection portion of the second nozzle and the other end communicates with the assist gas intake portion.
A nozzle for laser machining, which is characterized by being equipped with. The nozzle body has a cylindrical shape, the first nozzle is provided at the center position of the nozzle body, the second nozzle is provided at a position deviated from the center position of the nozzle body, and the first nozzle is provided. The nozzle for laser processing according to claim 6 , wherein the second nozzle is arranged along the radial direction of the nozzle body. The laser processing nozzle according to claim 6 or 7 , wherein the auxiliary nozzle is formed on the nozzle body. Said nozzle body, said notch portion on the tip outer peripheral portion adjacent to the second nozzle is provided, the notch in that the cover member is fixed, according to claim 6, characterized in that said auxiliary nozzle is formed Alternatively, the nozzle for laser processing according to claim 7. Any one of claims 6 to 9 , wherein a confluence portion of the assist gas ejected from the second nozzle and the assist gas ejected from the auxiliary nozzle is provided at the tip end portion of the nozzle body. Nozzle for laser processing described in the section. The laser processing nozzle according to any one of claims 6 to 10 , wherein the second nozzle has a rubberal shape. The laser processing nozzle according to claim 11 , wherein the second nozzle has an inner diameter that varies in the axial direction in the arrangement direction of the first nozzle and the second nozzle or in a direction intersecting the arrangement direction. The laser processing nozzle according to any one of claims 1 to 12 , wherein the first nozzle has a rubberl shape and ejects an assist gas. A laser processing apparatus comprising the nozzle for laser processing according to any one of claims 1 to 13.

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