JPH0641987U - Welding / fusing device - Google Patents

Abstract

(57) [Abstract] [Purpose] To prevent the damage of the lens due to the trailing edge caused by welding and fusing of the workpiece and the attachment of the trailing edge to the lens, and to perform stable machining of the workpiece with the laser beam. A welding / fusing device 12 comprising a pulse laser oscillator 13 and a nozzle portion 14 having a lens 7 for condensing the laser beam 1 from the pulse laser oscillator 13, the lens 7 and a tip portion 11 of the nozzle portion. And a shield plate 15 that blocks the laser beam 1 that has passed through the lens 7 at the peripheral edge 15a and that has four holes 15b that allow the laser beam 1 to pass through the peripheral edge 15a. The drive unit 16 for rotatably supporting the shield plate 15 is provided with the nozzle unit 1.
4 is arranged outside, and a control device 17 for controlling the rotation of the shielding plate 15 in synchronization with the pulse interval of the laser beam 1 is arranged between the driving device 16 and the pulse laser oscillator 13. There is.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a welding / fusing device for welding / fusing a workpiece by using a laser beam from a pulse laser oscillator.

[0002]

[Prior art]

 Hereinafter, a conventional welding and fusing device will be described with reference to FIGS.

In the figure, 1 is a laser beam such as a carbon dioxide gas laser, 2 is a laser oscillator for generating the laser beam 1, and the laser beam 1 oscillated from the laser oscillator 2 is directed by a reflecting mirror 3. It is changed and focused by the lens 7 built in the nozzle part 4 so that the welding / fusing position 9 of the workpiece 8 is focused, and the welding / fusing position 9 of the workpiece 8 is irradiated and irradiated. The workpiece 8 is welded and melted.

In the figure, 5 is a blow-in port, 6 is an assist gas, and the assist gas 6 removes or cuts the plasma generated by the irradiation of the laser beam 1 when the workpiece 8 is processed by the laser beam 1. It is used as gas.

When the metal workpiece 8 is cut by the laser beam 1, oxygen is generally used as the assist gas 6, and the workpiece 8 is heated by the laser beam 1 and the workpiece 8 and the assist gas 6 are heated. With the combination with the above, the heating of the welding / fusing position 9 of the workpiece 8 can be promoted and the processing speed can be increased.

[0006]

[Problems to be solved by the device]

 According to the conventional welding and fusing apparatus described above, a large amount of sparks and a high-temperature end (spatter) 10 are scattered from the laser beam irradiation position of the workpiece 8 and the end 10 enters the nozzle portion 4. There was a problem that it adhered to the lens 7 and scratched the lens 7.

Further, as described above, when the lens 7 is scratched by the trailing end 10 or when the trailing end 10 adheres to the lens 7, the laser beam 1 is scattered and the lens 7 retains high heat, which is the worst case. In some cases, it may melt, or the curvature of the laser beam 1 may change due to the deformation of the lens 7 and the energy efficiency may change, making it impossible to cut the workpiece 8 that could be cut. There was a problem that the welding depth could not be obtained.

In view of the above situation, the present invention prevents the lens from being scratched or attached to the lens by the trailing edge caused by welding or fusing of the workpiece, and stabilizes by the laser beam. It is an object of the present invention to provide a welding / fusing device capable of processing a processed workpiece.

[0009]

[Means for Solving the Problems]

 The present invention is a welding and fusing device comprising a pulse laser oscillator and a nozzle portion having a lens for condensing a laser beam from the pulse laser oscillator, wherein the welding and fusing device is provided between the lens and the tip of the nozzle portion. In addition, a shielding plate that blocks the laser beam that has passed through the lens at its peripheral portion and has at least one hole portion that allows the laser beam to pass through the peripheral portion is provided. A driving device that rotatably supports is disposed outside the nozzle unit, and the shielding plate is provided between the driving device and the pulse laser oscillator in synchronization with a pulse interval of the laser beam generated by the pulse laser oscillator. The present invention relates to a welding and fusing device, which is characterized in that a control device for controlling the rotation of the is installed.

[0010]

[Action]

 The laser beam oscillated at a predetermined pulse interval is focused by the lens of the nozzle, passes through the hole in the shield plate that rotates in synchronization with the pulse interval of the laser beam, and is covered with the assist gas from the tip of the nozzle. The work position is irradiated and the work is welded and melted. At this time, a trailing edge occurs due to welding and fusing, and this trailing edge also penetrates into the nozzle portion, but inside the nozzle portion after the laser beam has passed through the hole in the shielding plate, the shielding plate is the laser beam. Since it rotates in synchronism with the pulse interval of, since it is shielded by the peripheral edge of the shield plate, the fly ends adhere to the peripheral edge of the shield plate and do not reach the position of the lens.

Therefore, the fly end may reach the position of the lens only when the laser beam passes through the hole of the shield plate when the fly end passes through the hole. It is possible to prevent the lens from being scratched by the dust and to prevent the fly dust from adhering to the lens as much as possible, and it is possible to perform stable machining of the workpiece with the laser beam.

[0012]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 show an embodiment of the present invention, and in the drawings, the same components as those shown in FIGS. 4 and 5 are designated by the same reference numerals and their description is omitted. However, only the configuration unique to the present invention will be described below.

In the figure, reference numeral 12 is a welding / fusing device, which includes a reflecting mirror 3 for changing the path of the laser beam 1 and a laser beam 1 at a predetermined pulse interval (for example, 1000 minutes). Nozzle part having pulse laser oscillator 13 that oscillates at 1 second intervals, lens 7 that condenses laser beam 1 from pulse laser oscillator 13 and blow port 5 into which assist gas 6 (oxygen) flows 14 and a shielding plate 15 is arranged between the lens 7 built in the nozzle part 14 and the tip 11 of the nozzle part.

The shielding plate 15 has a disk shape with a diameter larger than that of the nozzle portion 14, and is arranged so as to fit into an opening 18 formed between the lens 7 and the tip 11 of the nozzle portion 14. A driving device 16 such as a pulse motor arranged outside the nozzle portion 14 is rotated via a shaft 15c parallel to the nozzle portion 14. Further, the shielding plate 15 has a peripheral edge portion 15a that blocks the laser beam 1 that has passed through the lens 7, and a hole portion 15b (four holes in the case shown) that allows the laser beam 1 to pass through the peripheral edge portion 15a. The cover 19 surrounding the shielding plate 15 and the driving device 16 is fixed to the nozzle portion 14 to prevent the assist gas 6 from leaking.

The pulse laser oscillator 13 controls the rotation of the shield plate 15 by operating the driving device 16 in synchronization with the pulse interval of the laser beam 1 generated by the pulse laser oscillator 13. Are connected.

The size of the hole 15b of the shielding plate 15 may be any size that allows the laser beam 1 focused by the lens 7 to pass therethrough, and the laser beam 1 passes through the hole 15b. It may be determined from the diameter of the laser beam 1 at that time. The number of holes 15b can be arbitrarily determined, but the pulse interval of the laser beam 1, the number of rotations of the shield plate 15 rotated by the driving device 16, and the peripheral portion when the laser beam 1 is not oscillated. It is determined by how much 15a can shield the inside of the nozzle unit 14.

For example, assuming that the peripheral portion 15a sufficiently shields the inside of the nozzle portion 14 when the laser beam 1 is not oscillating, and the pulse interval of the laser beam 1 is 1000 seconds, which is 1 second, In the case shown in Fig. 3, since four holes 15b are provided, the shielding plate 15 may be controlled to rotate once in 4/1000 seconds, and the shielding plate 15 rotates once in 1/1000 second. If it is controlled to do so, one hole 15b may be provided.

The operation of the welding / fusing device 12 having the above configuration will be described below.

When the pulse laser oscillator 13 oscillates the laser beam 1 with a predetermined pulse interval (1/1000 second interval), the control device 17 controls the drive device 16 so that the shield plate 15 is moved by the drive device 16. It rotates in synchronization with the pulse interval of the laser beam 1 (one rotation in 4/1000 seconds). The laser beam 1 is bent by the reflecting mirror 3 and enters the lens 7 of the nozzle portion 14, is condensed by the lens 7, passes through the hole portion 15b of the shielding plate 15, and is blown from the nozzle tip 11 to the blowing port 5 The welding / fusing position 9 of the work 8 is irradiated with the assist gas 6 (oxygen) blown from the work 8 to weld / fuse the work 8.

At this time, a trailing end 10 is generated due to the welding and fusing, and the trailing end 10 also penetrates into the inner portion of the nozzle portion 14, but after the laser beam 1 passes through the hole portion 15 b of the shielding plate 15, Since the shield plate 15 is rotated in synchronization with the pulse interval of the laser beam 1 inside the nozzle part 14, it is shielded by the peripheral edge portion 15a of the shield plate 15, so that the tip 10 of the shield plate 15 is covered. It collides with and adheres to the lower surface of the peripheral edge portion 15a and does not reach the position of the lens 7.

Therefore, it is possible that the flying tip 10 reaches the position of the lens 7 when the laser beam 1 passes through the hole portion 15 b of the shield plate 15 and the flying tip 10 is in the hole portion 15 b. Therefore, it is possible to prevent the lens 7 from being damaged by the trailing end 10 and preventing the trailing end 10 from adhering to the lens 7 as much as possible, and stable welding of the workpiece 8 by the laser beam 1 is performed.・ Fusing can be performed.

It should be noted that the present invention is not limited to the above-described embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

[0024]

[Effect of device]

 As described above, according to the welding and fusing device of the present invention, it is possible to prevent the lens built in the nozzle part from being damaged by the trailing end and to prevent the trailing end from adhering to the lens as much as possible. The beam scatters, the lens retains high heat and melts in the worst case, or the lens deformation causes the laser beam curvature to change and the energy efficiency to change. It is possible to achieve an excellent effect that a stable work can be performed on a work piece by a laser beam, because the workability becomes impossible and a desired welding depth cannot be obtained.

[Brief description of drawings]

FIG. 1 is an overall schematic diagram showing a part of an embodiment of the present invention by cutting it.

FIG. 2 is an overall schematic view showing a state in which a laser beam of the welding and fusing apparatus of FIG. 1 is not oscillated and a part of which is cut.

FIG. 3 is a view on arrow III-III in FIG. 1.

FIG. 4 is a schematic diagram showing an outline of a conventional welding / fusing device.

FIG. 5 is a schematic diagram showing a state in which the fly ends adhere to the lens.

[Explanation of symbols]

 1 Laser Beam 7 Lens 11 Nozzle Tip 12 Welding / Fusing Device 13 Pulse Laser Oscillator 14 Nozzle 15a Peripheral 15b Hole 15 Shielding Plate 16 Drive 17 Control Device

Claims (1)

[Scope of utility model registration request] 1. A welding and fusing device comprising a pulse laser oscillator and a nozzle portion containing a lens for condensing a laser beam from the pulse laser oscillator, wherein the welding and fusing device is provided between the lens and the tip of the nozzle portion. Is provided with a shield plate that shields the laser beam that has passed through the lens at the peripheral edge and at least one hole that allows the laser beam to pass through the peripheral edge, and the shield plate can be rotated. A drive device supported by the nozzle is disposed outside the nozzle unit, and the shield plate is rotated between the drive device and the pulse laser oscillator in synchronization with the pulse interval of the laser beam generated by the pulse laser oscillator. Welding / fusing device characterized by having a control device for controlling the welding.