JP2002144062A - Laser beam machining head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laser beam machining head with which a three- dimensional shape is formed at the same time of a heat treatment. SOLUTION: The head is characterized by the fact that a plurality of feeding ports 16 for thermal spraying powder are located around the outgoing port 7 of a laser beam 11, spraying powder is melt-sprayed from the feeding ports 16 from equal angular directions whose center is the outgoing port 7, an electrode holder 27 is provided coaxially with and through an optical system 12 of lenses which converges the laser beam 11, a TIG electrode 28 is mounted on the tip of the electrode holder 27, further, a feeding route which feeds spraying powder 13 to the feeding ports is made straight 8 or spiral by taking account of the convergent characteristic of the spraying powder.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a laser processing head. For example, it is applied to build-up of steel products.

[0002]

2. Description of the Related Art When a conventional laser processing head is used to build a steel product, a pipe-shaped spraying powder feed pipe is generally arranged from a specific direction toward the focal point of a laser beam to spray the spraying powder. Or the laser beam is sent to the focal point of the laser from the entire tapered surface by making the periphery of the laser emission port into a conical shape.

[0003] When three-dimensionally formed by such a laser processing head, there are problems such as uneven thickness and non-uniformity of the welded layer. Therefore, a laser processing head capable of efficiently converging the sprayed powder to a laser emission port has already been proposed (Japanese Patent Application Laid-Open No. 11-333584).

[0004]

However, even when performing laser overlaying using the above-mentioned laser processing head, since it was used alone, it was not possible to form a three-dimensional shape while performing heat treatment simultaneously. For this reason, it has been difficult to apply three-dimensional modeling to materials having no ductility depending on the material.

[0005] Also, in the TIG arc machining, welding and the like have been similarly performed using a single TIG machining head. The present invention has been made in view of the above conventional technology, and has as its object to provide a laser processing head capable of performing three-dimensional shaping while simultaneously performing heat treatment.

[0006]

According to a first aspect of the present invention, there is provided a laser processing head having a plurality of thermal spray powder outlets arranged around a laser outlet for emitting a laser beam. A laser processing head for condensing and spraying the laser light onto the sprayed powder that is sprayed from the sprayed powder emission port from a uniform angular direction with the laser emission port as a center, and a lens optical system for condensing the laser light. On the other hand, an electrode holder is provided coaxially therethrough, and a TIG electrode is attached to a tip of the electrode holder.

According to a second aspect of the present invention, there is provided a laser processing head according to the first aspect, wherein a feed path for feeding the thermal spray powder to the thermal spray powder outlet is straight or spiral. Features.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A laser processing head according to the present invention has an electrode holder having a build-up powder feeding nozzle attached to the tip of a laser light focusing lens optical system and having a hole formed in the center. A plurality of ring-shaped lenses arranged in the axial direction of an electrode holder fitted on the outer peripheral surface are provided, and a TIG electrode is mounted on the tip of the ring-shaped lens. , Welding, welding and heat treatment.

[Embodiment 1] FIGS. 1 to 3 show an embodiment of a laser processing head according to the present invention. In this embodiment, a build-up powder feed pipe is arranged outside a cylindrical lens holder, and a ring-shaped condenser lens system is arranged inside the pipe. That is, inside the laser processing head 1, seven condensing lens optical systems 12 for condensing the laser light 11 are arranged in a lens holder, and the laser light 11 is bent by the condensing lens optical system 12. The guiding total reflection surface 21 and concave total reflection mirror 2
2, and a YAG laser device 9 is connected via an optical fiber 10 as shown in FIG.

The condensing lens optical system 12 has a ring shape so as to penetrate the electrode holder 27 as described later. Therefore, the laser light 11 generated by the YAG laser device 9 is guided by the optical fiber 10, divided into two by the convex total reflection mirror 21 and the concave total reflection mirror 22, and guided by the condenser lens optical system 12. . At the tip of the laser processing head 1, a cladding tip head 6 is mounted, and inside the cladding tip head 6, at intervals of 120 ° around the laser emission port 7 of the laser beam 11. , 3
A plurality of cladding powder emission ports 16 are provided.

The cladding powder exit 16 is connected to a cladding powder feed pipe 4 arranged on the outer periphery of the lens holder. As shown in FIG. It is connected to the powder supply device 2. Therefore, the overlay powder supply device 2
Powder 13 fed from the gas 3 and the center gas 17 descends through a plurality of powder feeding pipes 4 to the tip 6 of the laser processing head 1 which is the tip of the laser processing head 1. Sent. Further, as shown in FIG. 2, a spiral blade 8 or a straight blade (not shown) around the laser emission port 7 between the laser emission port 7 and the build-up powder emission port 16 inside the cladding tip head 6. ) Is attached.

The spiral blade 8 or the straight blade is
An angle direction (120
(Interval), the build-up powder 13 is fed in, and the build-up powder 13 is efficiently converged to the laser emission port 7. The spiral blade 8 or the straight blade has a detachable structure so that the shape can be easily changed. Accordingly, the build-up powder 13 sent from the build-up powder supply device 2 through the plurality of build-up powder feed pipes 4 to the build-up powder emission port 16 is applied on the base material 5 by the spiral blade 8 or the straight blade. Converged,
When the laser beam 11 is condensed on the build-up powder 13 on the base material 5, the build-up powder 13 is melted and the laser build-up is performed on the surface of the base material 5.

That is, in the laser processing head 1, the build-up powder 13 is fed through the inner periphery of the spiral blade 8 or the straight blade by the build-up powder supply pipe 3 and shielded, so that the laser build-up on the base material 5 is performed. Becomes possible. On the other hand, an electrode holder 27 is arranged coaxially in the center of the condenser lens
The tip of the TI
A tungsten electrode 28 is attached as a G electrode. The electrode holder 27 is a cylindrical electrode holder 27 that contains and holds the tungsten electrode 28, and as shown in FIG.
And an electrode cooling water inlet 24 and an electrode cooling water outlet 25.

Accordingly, power is supplied from the TIG device 19 to the electrode holder 27 via the TIG power supply unit 23, and a TIG arc 29 is generated from the tungsten electrode 28. Since the TIG arc 29 is used as a heat source such as preheating, an arc is generated at a point beyond the laser focal position. As described above, the heat treatment is performed by the TIG arc 29 generated from the tungsten electrode 28 provided in front of the laser focal point, so that even a material having no ductility can be applied to a material having no ductility, so that the cooling rate is reduced, so that cracks and the like do not occur. High-accuracy laser overlaying becomes possible.

The tungsten electrode 28 is connected to the electrode cooling water 2.
4 and is cooled by cooling water flowing out of the electrode cooling water outlet 25. The head cooling water 1 is provided around the build-up tip head 6 in order to protect the emission port from radiant heat at the time of build-up and the reflected light of the laser light 11 and the TIG arc and laser light.
8 is cooled. Further, a focus adjusting mechanism 14 is provided on the outer peripheral surface of the laser processing head. Since the focus adjusting mechanism 14 can change the distance between the laser beam focus and the convergence point of the build-up powder, the build-up powder 13 is accurately fed, and the build-up powder 13 is reliably melted and symmetrically melted. A pond 15 can be formed.

Further, the laser processing head 7 is mounted on the NC manipulator 30, and controlled by the control panel 28, and the laser beam is passed through the same location a plurality of times, thereby forming a three-dimensional shape in which the surface is raised by the overlay bead. In this case, the same operation and effect can be obtained, and the arrangement of the cladding 13 is extremely easy. As described above, in the present embodiment, since the buildup powder supply pipe 4, the focus lens optical system, and the TIG electrode have an integral structure, not only the handling of the buildup powder becomes extremely easy, but also the three-dimensional Since it can be shaped, there is an advantage that the applicable range is further expanded.

Further, the build-up powder feeding section, the laser optical system and the T
By integrating the IG, there is also an advantage that the processing head can be made compact, and accuracy and quality can be improved. Furthermore, the approach to narrow parts becomes possible by making the processing head compact, and the use of a TIG arc heat source increases the cooling rate even for applications that are not ductile depending on the material. Is improved (reduced)
There is also the advantage of being done.

[0018]

As described above in detail with reference to the embodiments, the laser processing head according to the first aspect of the present invention has a plurality of cutouts around a laser emission port for emitting a laser beam. A laser processing head for disposing a build-up powder emission port and condensing and spraying the laser light onto the build-up powder injected from the cladding powder emission port from a uniform angular direction around the laser emission port; Since the electrode holder is provided coaxially with the lens optical system for condensing light, and the TIG electrode is attached to the tip of the electrode holder, not only the handling of the build-up powder becomes extremely easy,
Since the three-dimensional shape can be formed during the heat treatment, there is an advantage that the applicable range is further expanded, and there is also an advantage that the processing head can be made compact, and the accuracy and quality are improved. Also, in the laser processing head according to claim 2 of the present invention, the feed path for feeding the build-up powder to the build-up powder emission port is straight or spiral in claim 1. In addition to the effect similar to that of the described invention, there is an effect that the build-up powder can be efficiently converged to the laser emission port.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a laser processing head according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line CC in FIG.

FIG. 3 is an explanatory diagram of a use state of the laser processing head according to the first embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Laser processing head 2 Overlay powder supply device 3 Overlay powder supply gas 4 Overlay powder supply pipe 5 Base material 6 Overlay tip head 7 Laser emission port 8 Spiral blade 9 YAG laser 10 Optical fiber 11 Laser beam 12 Condensation Lens optical system 13 Overlay powder 14 Focus adjustment mechanism 15 Weld pool 16 Overlay powder exit 17 NC manipulator 18 Control panel 19 Head cooling water

Continued on the front page (72) Inventor Atsushi Shimono 2-1-1, Shinhama, Arai-machi, Takasago-shi, Hyogo F-term in Takasago Works, Mitsubishi Heavy Industries, Ltd. (Reference) 4E068 AA04 AH00 BB00 BB02 CD15

Claims (2)

[Claims] 1. A plurality of thermal spraying powder outlets are arranged around a laser emitting opening for emitting a laser beam, and thermal spraying is performed from the spraying powder emitting opening at a uniform angle from the laser emitting opening. In a laser processing head for condensing and spraying the laser light on powder, an electrode holder is provided coaxially with a lens optical system for condensing the laser light, and a TIG electrode is provided at a tip of the electrode holder. A laser processing head that is mounted. 2. The laser processing head according to claim 1, wherein a feed path for feeding the thermal spray powder to the thermal spray powder outlet is straight or spiral.