JPS63154287A - Nozzle for laser beam machine - Google Patents

Abstract

PURPOSE:To extend the service life of a nozzle and to stabilize the working quality by providing the gas exhaust port exhausting one part of the gas lad into a nozzle at the converging system side from the nozzle tip. CONSTITUTION:A gas exhaust port 501 is arranged at the position approaching to a converging system 3 in the vicinity of the tip of a nozzle 1. A laser beam 2 is converged by a condensing lens 3 to perform the work of the body 4 to be worked. In this case, when a shielding gas is fed from a gas lead-in port 500, one part of the gas is exhaused from an exhaust port 501, so the gas flow 502 from the nozzle inner part to the nozzle external part is caused. The spatter 6 intruded into the nozzle 1 at the laser machining time is carried out to the nozzle external part with the gas flow 502. consequently, the adhesion of the spatter 6 to the converging system 3 is prevented, the life of the nozzle 1 is extended and the working quality is improved as well.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a nozzle for a laser processing machine that prevents contamination of a laser condensing system due to sputtering from a workpiece being processed by a laser.

[Conventional technology]

FIG. 6 is a cross-sectional view showing a conventional nozzle for a laser processing machine disclosed in, for example, Japanese Utility Model Application Publication No. 52-56689. In FIG. 2, (1) is the nozzle, (2) is the laser beam, and (3) is the nozzle.
) is a condensing system for the laser beam (2), here it is a condensing lens, (4) is the workpiece to be processed by the laser beam, and (5)
) is an arrow indicating the gas flow path inside the nozzle.

(500) is a gas inlet, and (6) is sputtering from the workpiece (4).

Next, the operation will be explained. The laser beam (2) is narrowed down by a condensing lens (3) and irradiated onto the workpiece (4) from the tip of the nozzle to process the workpiece (4).

In order to improve the quality of the machined surface, 2, for example, N2 is introduced as a sealing gas into the nozzle from the gas inlet and is ejected from the tip of the nozzle onto the surface of the workpiece (4). Generally, the tip of the nozzle has a diameter of 2 to 3 cm, and the diameter of the nozzle (30 to 100+
am) because it is small compared to

The sealing gas is compressed into the nozzle, thus creating a gentle gas flow inside the nozzle or in front of the condenser lens (3).

[Problem that the invention seeks to solve]

Since the conventional nozzle for a laser processing machine is configured as described above, the spatter (6) from the workpiece is transferred to the nozzle (1).
) If the gas enters the nozzle against the jet of seal gas from the tip of the condenser (3), it will be carried by the gentle gas flow in front of the condenser (3) and adhere to the condenser (3).

There was a problem in that the condensing system (3) was destroyed due to the deposit absorbing the laser beam and generating heat.

Party B's invention is 2. This was made to solve the above-mentioned problems, and the object is to obtain a nozzle for a laser processing machine in which spatter from a workpiece does not adhere to the condensing system (3).

[Means for solving problems]

A nozzle for a laser processing machine according to the present invention (a nozzle in which a laser beam that is irradiated onto a workpiece and used to process the workpiece is condensed by a condensing system and passes through, from the tip of this nozzle to the surface of the workpiece) A gas introduction port for introducing the ejected gas into the nozzle, and a gas inlet provided on the condensing system side from the tip of the nozzle, and discharging a part of the gas introduced into the nozzle to cause the gas to flow to the outside. It is equipped with a gas outlet that generates gas.

[For production]

In this invention, the gas outlet generates a gas flow in the nozzle from the gas inlet to the outlet, and spatter from the workpiece in the nozzle is carried out to the outside of the nozzle.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure is a cross-sectional view of a nozzle for a laser processing machine according to an embodiment of the present invention. In Figure 2, (501) is a gas exhaust port;
A gas inlet (500) and a condensing system, here a condensing lens (
3) It is provided in between.

Next, the operation will be explained. The laser beam (2) is focused by a condensing lens (3) to process the workpiece (4). At this time, seal gas N2, for example, is introduced from the gas inlet (500) and is ejected from the tip of the nozzle (1). By providing the gas exhaust port (501), a part of the gas introduced into the nozzle is discharged from the gas exhaust port, so that the gas flows from a part of the nozzle to the outside of the nozzle (502). occurs.

During laser processing, spatter (6) is generated from the workpiece (4), and the spatter that enters the nozzle is carried out of the nozzle (1) by the above-mentioned gas flow (502). Therefore, spatter (6) does not adhere to the surface of the condensing system (3).

In addition, in the above embodiment, the gas discharge port (501) is a nozzle (
The hole formed in 1) is shown as a single hole, but as shown in Figure 2, if a gas guide (503) is provided near the gas outlet (501) to adjust the gas flow, the gas flow will be smooth. The effect will increase.

Alternatively, as shown in FIG. 3, two gas inlets may be provided, one of which may be used as a gas inlet for processing (504), and the other may be used as a sputter discharge gas inlet (505). (
55) shows the flow of gas ejected from the tip of a normal nozzle.

In addition, as shown in Fig. 4, a pump (9) is provided between the gas inlet (500) and the gas outlet (501) by connecting the gas inlet (500) and the gas outlet (501) outside the nozzle (1), and the pump (9) pumps the gas. By circulating the gas within the nozzle, the amount of gas consumed can be reduced.

Furthermore, as shown in FIG. 5, the laser beam is configured to pass through a condensing lens (3), then be bent by a bend mirror (7), reach the tip of the nozzle, and be guided to the surface of the workpiece, Connect the gas outlet (501) with a bend mirror (
It may be provided around 7). in this case.

The condensing lens (3) and the bend mirror (7) together form a condensing system.

-Although a condensing lens was used as the condensing system in the above embodiment, other types of lenses, such as a day lens, may also be used, and the same effects would be achieved.

〔Effect of the invention〕

As described above, according to the present invention, there is provided a nozzle through which a laser beam that is irradiated onto the workpiece (4) and processes the workpiece is focused by a condensing system and passes through the workpiece. A gas introduction port for introducing the gas ejected onto the surface into the nozzle, and a gas inlet provided on the condensing system side from the tip of the nozzle, and discharging a part of the gas introduced into the nozzle to the outside of the gas. Equipped with a gas outlet that generates a flow of
There is almost no contamination of the condensing system due to spatter from the workpiece (4), and therefore the condensing system has a long lifespan, reducing the number of replacements and enabling stable and inexpensive laser processing. This has the effect of providing a nozzle for laser processing machines.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a nozzle for a laser processing machine according to an embodiment of the present invention, and FIGS. 2, 3, 4, 2, and 5 are sectional views showing embodiments of the invention. FIG. 6 is a sectional view showing a conventional nozzle for a laser processing machine. (1 nozzle, +21 ・Laser beam, +31・
...JI optical system. (4) Workpiece, (SOO) gas inlet, (
501) - Gas outlet, (502) Gas flow. Note that the same line numbers in Figure 1 indicate the same or equivalent parts.

Claims (4)

[Claims] (1) A nozzle in which the laser beam that is irradiated onto the workpiece and used to process the workpiece is focused by a condensing system and passed through, and the gas that is ejected from the tip of this nozzle onto the surface of the workpiece is introduced into the nozzle. and a gas exhaust port that is provided on the condensing system side from the tip of the nozzle and that discharges a part of the gas introduced into the nozzle to generate a flow of gas to the outside. Nozzle for laser processing machines. (2) The nozzle for a laser processing machine according to claim 1, wherein the gas exhaust port is provided between the gas inlet of the nozzle and the condensing system. (3) A nozzle for a laser processing machine according to claim 1, wherein the laser beam is guided onto the workpiece by a bend mirror, and the three gas discharge ports are provided around the bend mirror. (4) Connect the gas inlet and gas outlet on the outside of the nozzle,
A nozzle for a laser processing machine according to any one of claims 1 to 3, which circulates gas.