Method of metal sheet laser cutting

FIELD: process engineering.

SUBSTANCE: proposed method may be used in nuclear power engineering and other branches of machine building. Proposed method comprises focusing laser beam at material and feeding protective inert gas into cutting zone. Inert gas is fed via nozzle at its outlet pressure of, at least, 3.5·10-5 MPa. Note here that laser beam with wavelength of 1.06-1.07 mcm is used and directed via said nozzle coaxially with its lengthwise axis.

EFFECT: higher efficiency and quality, ruled out metal corrosion.

2 cl, 1 dwg, 2 ex

 

The invention relates to the field of metal working, and in particular to methods and devices for laser cutting a metal sheet materials, and can be used in nuclear engineering, and other industries.

When carrying out laser cutting of sheet material, a metal which when heated intensively interacts with the oxygen of the air is reduced possibilities for resisting corrosion processes. These corrosion processes take place during the cutting and further exploitation of the products obtained from the cut sheet of material.

The known method of laser processing (perforation) details, including direction on the part of the focused laser beam with simultaneous flow in the zone of cutting a protective inert gas through a nozzle located at an angle to the back surface (SU 1515551 published 20.07.06). Shielding gas is intended for removal of technological waste and does not protect the metal from interacting with oxygen.

There is also known a method for laser cutting of metallic materials (see JP 2000202678 And published. In 25.07.2000), including direction to the material of the focused laser beam with simultaneous feed into the cutting zone of the auxiliary gas of oxygen and flow through an annular nozzle ehkraniruyuscikh the inert gas to ensure the purity of the oxygen by the oxygen of the air.

In known gas also does not provide protection of the metal from oxygen, because oxygen is used as the auxiliary gas.

The closest to the invention is a method of laser processing of materials, consisting in the direction of material focused laser beam and simultaneous submission in the area of cutting the protective gas through the tubular mirror, coaxially to the longitudinal axis of the laser beam (see JP 2020682 And published. 24.01.1990).

The known method is intended primarily for surface treatment of various materials, including cutting material on the surface, but not cutting sheet metal material. Therefore, it does not solve the problem of the corrosion resistance of metal.

Objective of the claimed invention is a method for laser cutting of sheet metal material, which eliminates the reduction of the corrosion resistance of the metal due to its interaction with oxygen.

The technical result of the invention consists in protecting the metal from exposure to oxygen and the elimination of the reduction of the corrosion resistance of metal when carrying out laser cutting metal sheet material without the use of auxiliary cutting gases.

This technical result is achieved in the method of laser cutting use the th sheet material, namely, in the direction of the material of the focused laser beam and simultaneous submission in the area of cutting a protective inert gas through the nozzle, coaxial to the longitudinal axis of the laser beam, the pressure at the exit of the nozzle support at least 3.5·10-5MPa, using a laser beam with a wavelength of 1.06-of 1.07 μm.

As the inert gas used is preferably argon.

To reduce the preparatory operations for cutting sheet material applied to the combination of the axis of the laser beam and the axis of the nozzle inert gas. The inert gas is led to the nozzle through the pipe connected to the chamber for inert gas, the output of which is mounted the said nozzle. These techniques in combination, not only the enveloping protecting metal inert gas when performing high-temperature cutting operations, but also allow you to quickly cool the separated parts of the sheet material that virtually eliminates the reduced ability of the metal material to resist corrosion processes as during the cutting and further exploitation of the products obtained with the use of laser cutting. The gas pressure at the nozzle exit is maintained at the level not lower than a 3.5×10-5MPa. This uses a laser with a wavelength of 1.06-of 1.07 μm. This is helps to reduce the tendency of the material to corrosion processes.

1 schematically shows a device for the implementation of the proposed method of laser cutting. The device comprises a block 1 of the laser radiation, the tool 2 focus laser beam, located at the entrance to the chamber 3 for the inert gas. At the output of the camera 3 is installed nozzle 4, preferably of conical shape, for supplying inert gas to the zone 5 of the cutting. Camera 3 is also provided with a pipe 6 to supply an inert gas. Thus the axis of the laser beam 8 generated by the tool 2, and the longitudinal axis of the nozzle 4 are combined with each other.

The method is as follows.

In the block 1 is formed by the laser beam 8, which focuses tool 2 and is directed through the chamber 3 of the processed sheet metal material 7 in the area of cutting 5. Through the pipe 6 into the chamber 3 is injected inert gas (e.g. argon), through which the nozzle 4 is also fed into the cutting area 5, cooling and enveloping separated parts of the sheet material, blowing the products of oxidation and the resulting Burr. The gas pressure at the nozzle exit is maintained at the level not lower than a 3.5×10-5MPa. In addition, to fully exclude the occurrence tendency of the material to the subsequent development of corrosion processes during the use of products obtained from the cut blanks, the wavelength of laser radiation is maintained in Predela,06-1,07 μm. In the process of cutting unit 1 is moved in a plane parallel to the plane of arrangement of sheet material along a predetermined cutting program.

Example 1

Produced cutting of sheet material from an alloy of zirconium with a thickness of 0.5 mm Diameter laser beam was 10 μm (~10 units of wavelength), the wavelength of 1.06...of 1.07 μm, was used, the inert gas is argon, the pressure at the exit of the nozzle was 7×10-5MPa. While cutting width was 500±50 μm. After cutting the resulting preform had a good surface quality of the edges and showed no inclination to corrosion processes during subsequent operation of the products.

Example 2

Produced cutting of sheet material from an alloy of zirconium with a thickness of 0.3 mm Diameter laser beam was 10 μm (~10 units of wavelength), the wavelength of 1.06...of 1.07 μm, was used, the inert gas is argon, the pressure at the exit of the nozzle was 4±10-5MPa. The width of the cut was 450±50 μm. After cutting the resulting preform had a good surface quality of the edges and showed no inclination to corrosion processes during subsequent operation of the products.

1. The method of laser cutting a metal sheet material, including direction on the material of the focused laser beam although the authorized supply to the zone of cutting a protective inert gas through the nozzle, coaxially to the longitudinal axis of the laser beam, the pressure at the exit of the nozzle support at least 3.5·10-5MPa and use a laser beam with a wavelength of 1.06-of 1.07 μm.

2. The method according to claim 1, characterized in that as the inert gas used argon.



 

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