JP2544186Y2 - Processing head structure of laser beam machine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a processing head structure of a laser processing machine for condensing a laser beam and irradiating the processing object with a laser beam, and performing laser processing such as cutting, welding, and surface modification of the processing object. Things.

[0002]

2. Description of the Related Art Normally, a laser beam machine guides a laser beam emitted from a laser oscillator to a machining head.
The laser beam is squeezed by an optical system such as a lens or a parabolic mirror built in the processing head, and the laser beam is condensed on a work surface as a processing target to perform laser processing on the work.

[0003] At this time, the laser light is narrowed down into a conical shape and passes through the inside of a torch cover as a torch portion provided in the processing head, and the torch cover usually focuses the laser light. It is formed in a corresponding conical cylindrical shape along the conical shape.

Further, in order to remove plasma generated during laser processing and to prevent fumes and spatter from adhering to an optical system, a processing auxiliary gas is supplied into the torch cover so that the vicinity of the processing point of the work from the torch cover tip side. It is configured to eject a processing auxiliary gas toward.

[0005]

However, the torch cover is formed in a conical shape having a larger diameter than the actual converging trajectory of the laser light so that the laser light does not hit the torch cover itself. Therefore, when the outer diameter of the torch cover is large and the workpiece has a complicated three-dimensional shape, the torch cover and the rising portion of the workpiece interfere with each other, and the processing head may take an optimal processing posture. There was a problem that it was not possible.

In view of the above problems, an object of the present invention is to provide a processing head structure of a laser processing machine capable of taking an optimum processing posture even for a processing object having a complicated shape. .

[0007]

The technical means for achieving the above object is to make the laser light guided to the processing head pass through the inside of the torch while converging it by an optical system,
In a processing head structure of a laser processing machine that irradiates a processing target object with a laser from a torch tip end side, a part of the torch part is formed in a notch shape, and the torch part side outer surface side of the optical system In addition to the above, a pollution prevention gas supply path for supplying a pollution prevention gas is provided, and a processing auxiliary gas supply path for supplying a processing auxiliary gas near the processing point is provided.

Further, the torch portion and the processing auxiliary gas supply path may be provided on a processing head so as to be rotatable around the optical axis of the laser beam passing through the torch portion.

[0009]

According to the present invention, when laser processing is performed with the notch-shaped portion of the torch portion directed toward the rising portion of the object to be raised three-dimensionally, the rising portion and the torch can be formed. Interference with the part can be effectively avoided, and the processing head can be brought closer to the rising portion, so that the optimum processing posture of the processing head can be easily obtained.

The optical system is exposed because a part of the torch portion is cutout. However, the contamination preventing gas supplied to the outer surface of the optical system from the contamination preventing gas supply passage is used. Adhesion to the surface of the optical system such as fume and spatter can be effectively prevented, and contamination of the optical system can be prevented.

Further, the plasma generated during laser processing is effectively removed by the processing auxiliary gas supplied from the processing auxiliary gas supply passage near the processing point, and the laser processing is performed favorably.

If the processing head is provided with a torch part and a processing auxiliary gas supply path so as to be freely rotatable around the optical axis of the laser beam passing through the torch part, the torch part and the processing auxiliary gas supply path are provided. By rotating around the optical axis, interference with the rising portion of the object to be processed can be easily avoided, resulting in excellent operability.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIGS. 1 and 2, reference numeral 1 denotes a processing head of a laser processing machine, and a head housing 2 has a collective optical system as a condensing optical system. The optical lens 3 is mounted.

The laser beam machine is provided with a laser oscillator (not shown), and a plurality of optical systems such as reflecting mirrors are appropriately disposed to guide the laser beam 4 emitted from the laser oscillator to the machining head 1. .

A torch cover 5 serving as a torch portion is provided at the leading end of the laser beam 4 guided to the processing head 1 in the traveling direction.
Are attached to the head housing 2 via the rotating ring body 6. The torch cover 5 has a structure in which a truncated conical cylindrical body having substantially the same inclination as the converging trajectory of the laser light 4 is cut off in a longitudinal half along the axis thereof, and is not shown. The torch cover 5 is supported by the rotating ring body 6 so that the torch cover 5 can be freely rotated in the forward and reverse directions around the optical axis 7 of the laser beam 4 by the turning operation mechanism.

The condensing lens 3 is mounted inside the head housing 2 in a partitioned manner inside and outside. The condensing lens 3 is located between the mounting position of the condensing lens 3 and the rotating ring body 6, and the outer surface of the condensing lens 3 On the 3a side, that is, on the surface side on the torch cover 5 side, a pollution prevention gas supply pipe 8 as a pollution prevention gas supply passage for ejecting and supplying a pollution prevention gas such as nitrogen is provided.

Further, along the outer surface 5a of the torch cover 5, a processing auxiliary gas supply path is provided as a processing auxiliary gas supply passage for ejecting and supplying a processing auxiliary gas such as argon near a processing point where the laser beam 4 is focused. A pipe 9 is provided.
This processing auxiliary gas supply pipe 9 is connected to the pipe tip 9 along the outer surface 5a side of the torch cover 5 by welding or the like.
a, and a flexible pipe (not shown) connected to the pipe tip 9a. The processing auxiliary gas supply pipe 9 is guided to the head housing 2 side via this flexible pipe. I have. Here, when the torch cover 5 is rotated around the optical axis 7 of the laser beam 4, the tip of the processing auxiliary gas supply pipe 9 is moved together with the torch cover 5 by the flexible action of the flexible pipe. It is configured so as to be integrally rotated around seven.

The embodiment of the present invention is configured as described above. As shown in FIG. 1, a workpiece 11 as a processing object has a three-dimensional shape and a processing portion 12 for performing laser processing such as welding. Is close to the rising wall 13 of the work 11, the notch-shaped portion of the torch cover 5 faces the rising wall 13 side.
Is rotated around the optical axis 7 by a predetermined angle, the interference between the torch cover 5 and the rising wall 13 can be effectively avoided, and the processing head 1 can be brought closer to the rising wall 13 side. Therefore, the flexibility of the processing posture can be improved, and the optimum processing posture of the processing head 1 can be easily obtained.

Since a part of the torch cover 5 is notched, the outer surface 3a of the condenser lens 3 on the side of the torch cover 5 is exposed. The fumes, spatters and the like are blown off and removed by the pollution preventing gas ejected and supplied to the outer surface 3a side of the lens, so that the fumes and spatters can be effectively prevented from adhering to the condenser lens 3, and the condenser lens 3 can be prevented from being stained.

Further, the plasma generated during laser processing is effectively blown off and removed by the processing auxiliary gas ejected from the processing auxiliary gas supply pipe 9 to the processing portion 12 near the processing point, so that laser processing can be performed well. Can be.

In the above embodiment, the torch cover 5 has a truncated-cone-shaped cylindrical body in which the longitudinal half along the axis is cut off. Is not limited to this shape at all. That is,
Any shape may be used as long as the laser light 4 is not obstructed, the side surface of the torch cover 5 is removed in an open manner, and the processing auxiliary gas supply pipe 9 can be attached.

[0022]

As described above, according to the processing head structure of the laser processing machine of the present invention, a part of the torch portion is formed in a notch shape, and a pollution preventing gas is supplied to the outer surface of the optical system on the side of the torch portion. And a processing auxiliary gas supply path for supplying a processing auxiliary gas near the processing point, so that interference between the torch portion and the processing object can be effectively avoided. In addition, the optimum processing posture of the processing head can be easily obtained. In addition, the contamination prevention gas supplied from the contamination prevention gas supply path can prevent contamination of the optical system, and the processing auxiliary gas supplied from the processing auxiliary gas supply path can advantageously perform laser processing.

Further, in a structure in which the torch portion and the processing auxiliary gas supply path are provided on the processing head so as to be rotatable around the optical axis of the laser beam passing through the torch portion,
By rotating the torch portion, interference between the workpiece and the torch portion can be easily avoided, resulting in excellent operability.

[Brief description of the drawings]

FIG. 1 is a front view of a main part showing an embodiment of the present invention.

FIG. 2 is a front view showing a state in which the torch cover in FIG. 1 has been rotated by 90 degrees around the optical axis.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Processing head 3 Condensing lens 3a Outer surface 4 Laser beam 5 Torch cover 7 Optical axis 8 Pollution prevention gas supply pipe 9 Processing auxiliary gas supply pipe 11 Work 12 Processing part 13 Standing wall

Continued on the front page (72) Inventor Toshihide Kuroda 6-107, Takino-cho, Nishinomiya-shi, Hyogo Shinmeiwa Industries Co., Ltd. Development Technology Division (72) Inventor Shigeki Fujinaga 6-107, Takino-cho, Nishinomiya-shi, Hyogo No. Shinmei-Wa Industries Co., Ltd., Development Technology Division (72) Inventor Junko Momozaki 6107 Takino-cho, Nishinomiya-shi, Hyogo Prefecture Shinmei-Wa Industries Co., Ltd. Development Technology Division (56) References 284789 (JP, A) JP-A-64-62295 (JP, A)

Claims (2)

(57) [Scope of request for utility model registration] 1. A laser beam machine for laser-machining a processing object by converging a laser beam guided to a processing head by an optical system, passing the inside of the torch part, and irradiating the processing object from the tip of the torch part. In the processing head structure, a part of the torch portion is formed in a notch shape, and a pollution prevention gas supply path for supplying a pollution prevention gas to the outer surface side of the torch portion side of the optical system is provided. A processing head structure for a laser beam machine, comprising a processing auxiliary gas supply path for supplying a processing auxiliary gas. 2. The processing head according to claim 1, wherein the torch and the processing auxiliary gas supply path are rotatably operated around an optical axis of a laser beam passing through the torch. Processing head structure of laser processing machine.