JPS62104690A - Laser beam cutting method - Google Patents

Abstract

PURPOSE:To perform the processing having no sticking of a melting material on the back face by performing a laser beam cutting after fixing in contact by pouring a fluid between the bodies to be worked in case of cutting the body to be worked by overlapping >=two sheets. CONSTITUTION:The body 5 to be worked in thin thickness which is overlapped >=two sheets is fixed by contact-fitting with a clamping device 6 by pouring the liquid 8 of water, oils, etc., therein. THe work having no sticking of melting materials on the back face is performed due to the assisting gas passing through the cut groove smoothly and removing the melting material, when the body 5 to be worked and liquid 8 are cut with the laser beam simultaneously by laser beam 1 in this state.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a laser cutting method in which two or more thin-walled workpieces are overlapped and cut by a laser beam.

[Conventional technology]

This type of conventional laser cutting method is carried out as shown in Figure 3. In the figure, (1) is a laser oscillator (
(2) is a condensing lens that focuses the laser beam (1) to an energy density suitable for the purpose of processing, (3) is an unstuck gas supply port, (
4) is a cylindrical arrest gas nozzle coaxial with the laser beam (1) provided under the condensing lens (2), (5) is the workpiece, and (6) is the workpiece (5). ) is a clamping device that allows them to be tightly stacked.

Next, the operation will be explained. A laser beam (1) emitted from a laser oscillator (not shown) (and a condensing lens (2)
The light is focused by the beam, passes through the nozzle (4), and is irradiated onto the workpiece (5). At this time, by moving the workpiece (5) as shown by the arrow, the workpiece (5) is cut into an arbitrary shape, and the gas introduced from the unstuck gas supply port (3) is passed through the nozzle (4). ) onto the workpiece (5)
The vaporized metal is removed by melting the gas (gas) and removing the evaporated metal.If the workpieces are relatively thin and can be cut in layers, they are held together by external force using a clamping device (6), etc. disconnect.

[Problem that the invention seeks to solve]

Figure 4 shows how two thin-walled workpieces are processed using this method.
This figure shows a cross section of a cut portion when two or more sheets are cut in an overlapped manner. No matter how appropriately the laser output, processing speed, etc. are controlled, and no matter how strongly the lamp device (6) is tightened, a gap will be created between the workpieces (5) during cutting, and the flow of arrest gas will be interrupted. There is a problem that the molten material (7) adheres to the back ml at the bottom of the cut part.

This invention was made in order to solve the problem as described in L. It is possible to bring the workpiece into close contact with each other during cross-cutting and eliminate the adhesion of molten material to the back surface of the workpiece.
- Aiming at obtaining a laser cutting method.

[Means for solving problems]

The laser cutting method according to the present invention is a laser cutting method in which thin corrugated workpieces are overlapped and cut by a laser beam, in which a liquid such as water or oil is injected between the workpieces, and the workpieces are stacked closely together. , a laser cutting method characterized in that the workpiece is then cut by a laser beam.

[Operation] In this invention, the workpieces are brought into perfect contact with each other due to the surface tension caused by the liquid, so that the cutter's cutting gas is injected to the lowest workpiece without turbulence, and the molten material is Remove completely.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, (1) is the laser beam emitted from the laser oscillator, (2) is the condensing lens that focuses the laser beam (1) to an energy density that matches the purpose of processing, and (3) is the assist gas supply port. , (4) is a cylindrical assist gas and nozzle coaxial with the laser beam (1) that is provided under the condenser lens (2), (5) is the workpiece, and (6) is the workpiece. A clamp device (8) is a liquid injected between the workpieces to hold the workpieces in close contact with each other.

In FIG. 1, the laser cutting device itself is the same as the conventional one, but a liquid (8) such as water or oil is injected between the stacked corrugated objects (5). With this configuration, the workpiece (5) and the liquid (8) are irradiated with the laser beam (1).
) is laser-cut at the same time, the assist gas smoothly passes through the cutting groove and removes the molten material, so that processing is performed without molten material adhering to the back side, as shown in FIG.

〔Effect of the invention〕

Laser cutting method according to the present invention as explained by my son:
When cutting two or more workpieces stacked one on top of the other, a liquid such as water or oil is injected between the corrugated workpieces to secure them tightly, and the laser cutting is performed together with this liquid, which prevents molten material from adhering to the back side. This has the effect that processing after laser processing can be omitted.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing an embodiment of the present invention, Fig. 2 is a sectional view showing the effects of the invention, Fig. 3 is a sectional view showing the conventional method, and Fig. 4 is a sectional view showing the problems of the conventional method. It is a cross-sectional view. (1) is a laser beam, (2) is a condensing lens, (3) is a laser beam.
(4) is an assist gas supply port, (4) is a nozzle, (5) is a workpiece, (6) is a feed knob device, and (8) is an injected liquid. Note that the same numbers in the figures do not indicate the same or corresponding parts.1) Agent Patent Attorney Masaru Sato Figure 2

Claims (1)

[Claims] In a laser cutting method in which thin workpieces are overlapped and cut by a laser beam, a liquid is injected between the workpieces, the workpieces are closely stacked, and then the workpieces are cut by the laser beam. A laser cutting method characterized by: