Metal or alloy laser cutting method

FIELD: metallurgy.

SUBSTANCE: preliminary construction of calibration curve of dependence of cutting depth of specimen of the specified metal or its alloy on parameters of incident laser radiation to surface is performed at monotonic increase in specific power of laser radiation from value of 0.1 J/cm2·s to the value at which through cutting occurs. Then, metal or its alloy is molten-through along cutting line with laser beam by moving the laser beam progressively at speed V, and at the same time its rotation with radius R is performed. Radius R and angular rotation speed of laser beam ω is chosen considering the cut width and radius of laser beam.

EFFECT: high cutting speed at effective use of laser beam energy.

4 cl, 3 dwg, 1 ex

 

The invention relates to methods of processing, namely cutting metal products exposure to laser radiation. The inventive method can find application in various industries, including engineering, as well as in jewelry and medical fields.

Cutting of metal products by the action of the laser radiation is performed by moving the beam of laser radiation relative to the surface of the product. Performed incision metal products consists of a set of lines of different lengths. The depth of the data lines, which can be obtained per unit of time determines the speed of cutting of metal products and, in practice, is determined by the parameters of laser marking system, laser beam radiation, the movement of the beam relative to the surface of the product. In order to ensure the most rapid incision on this laser marking complex, usually choose the appropriate beam parameters of the laser radiation and the program move the beam of laser radiation relative to the surface of the product. The parameters of the beam of laser radiation, typically, are determined by the technical characteristics of the marking complex, and the program will move the beam relative to the surface of the product may vary by operator practice the Cesky arbitrarily.

The known method of laser cutting a metal plate (see patent US 6060687, IPC WK 26/00; VK 26/12 published 09.05.2000), which together with the beam of laser radiation in the region of the cut serves a mixture of at least one inert gas and hydrogen to prevent the formation of burrs and grooves.

For the implementation of this method requires complex technological equipment.

The known method of laser cutting a metal plate (see application EP 1920873, IPC WC 26/38; WK 26/00, published 14.05.2008), namely, that the cutting line repeatedly pass a beam of laser radiation, while in each iteration, increase the depth of the cut slit.

Multiple passage of a beam of laser radiation line of cut, carried out in a known way, significantly reduces the cutting capacity.

The closest to the essential features of the claimed technical solution is a method of laser cutting metal or alloy adopted for the prototype (see application DE 102008047761, IPC WC 26/073; VK 26/38 published 15.04.2010). Prototype method includes a preliminary construction of the calibration curve according to the cutting depth of the sample of a given metal or alloy on the parameters of the incident surface of the laser radiation and penetration of the metal in the cut line of the translational movement of the beam of laser radiation. The diameter of the beam is chosen such that the molten material is removed from the cut without using gas.

The disadvantage of this method is not sufficiently high cutting speed and low productivity of the process.

The task of the invention was to provide such a method of cutting metal or alloy, which would ensure more rapid incision of the processed material, i.e. most effectively used energy beam of laser radiation.

The task is solved by the method of laser cutting metal or alloy includes a preview build of the calibration curve according to the cutting depth of the sample of a given metal or alloy from the power density incident on the surface of laser radiation under monotonic increase mentioned specific capacity values from 0.1 j/cm2·to the value at which there is a through cut, and the melting metal or alloy on the cutting line of the translational movement of the beam of laser radiation. At the same time with the translational movement of the beam of laser radiation is implemented by its rotation with a radius R. the Radius R and the angular velocity of rotation ω of the beam of laser radiation satisfy the relations:

where d is the width of the cutting beam hole is REGO radiation, microns;

r is the radius of the beam of laser radiation microns;

V is the velocity of the translational movement of the beam of laser radiation, m/S.

Through the cut, you can perform continuous laser light or pulse laser radiation with a pulse duration of 5 NS to 100 μs.

Through cutting can be performed at the translational movement of the beam of laser radiation with a speed of 0.1-20000 mm/S.

The inventive method allows cutting of metal products faster compared to, for example, traditional progressive movement, which may indicate a higher efficiency of radiation of the laser system when implementing the inventive method.

A secondary, but no less important, was effective cutting of materials with a low coefficient of absorption (primarily gold). It appears that the total for all of the effects cause is re-entering beam of laser radiation on the already irradiated surface as it rotates. The rotation of the beam of laser radiation, thus, can be regarded as a kind of mechanical modulator laser radiation.

The inventive method of laser cutting metal or alloy is illustrated in the drawing, where

figure 1 is a given schematic illustration of cutting a rotating beam of laser radiation;

figure 2 shows the Yong in an enlarged scale section I, shown in figure 1;

figure 3 shows the product of gold obtained sharp by the claimed method.

Figure 1 is displayed: 1 - machined metal or alloy, 2 - line cutting, 3 - trajectory distance of the beam of laser radiation, the 4 - position of the beam of laser radiation at different points in time, r is the radius of the beam of laser radiation, R is the radius of rotation of the beam, d is the width of a cut.

The inventive method is as follows. Using a computer carry out the generation of the program move the beam of laser radiation in accordance with the topology of the performed cut and the desired predetermined thickness d. For effective power consumption of the laser radiation, and also due to the fact that the physical properties of various metals and alloys, the geometrical characteristics of the processed product can vary considerably, pre-build a calibration curve according to the cutting depth of the sample of a given metal or alloy on the parameters of the incident on the surface of laser radiation under monotonic increase of the power density of the laser radiation. For this purpose, in the technological scope of this laser system, vary the parameters of the impinging laser radiation. In addition to all the required area inside the cut line thickness d is exposed to a beam of laser radiation, steam is the ft V and ω opt, given the criteria (1) and (2). Then they cut metal or its alloy 1 (see figure 1, figure 2), propleurae metal or its alloy 1 in the cut line beam of laser radiation, moving the beam of laser radiation translational speed V and simultaneously rotating it with radius R with angular speed ω, the magnitude of which satisfy the relations (1) and (2).

Example.

Example. Was executed contour cut foil with a thickness of 150 μm 20×30 mm, the total length of the contour cutting - 42 cm, material - gold 585. The cut line was a contour of the head of the leopard (figure 3). Cutting was performed on a universal laser facility-based fiber laser "Minimarket 2" produced by LLC "Laser Center. Moving the beam of laser radiation relative to the surface of the product was carried out using a two-axis scanner-based actuators VM2500+. The duration of monopulse laser radiation was 35 NS, the modulation frequency of 80 kHz, the energy monopulse measured with a pyroelectric sensor Ophir D-25, 0,4 MJ, the beam diameter of the laser radiation on the surface of the product was 50 μm. Previously, using a sample of material was constructed calibration curve cutting depth from the parameters of the incident radiation on the surface of the radiation. Were selected the following parameters: the speed of the village is watalinga moving the beam of laser radiation V=0.025 m/s, the angular velocity ω of rotation of the beam of laser radiation was equal to 40,000 rad/S. Based on the topology of the stamp, the radius R of rotation was chosen equal to 100 μm. The time taken to perform this contour cutting, including time on and off the laser beam to move to the next line was 30 seconds. For comparison has been made of a similar cut at the same laser facility without rotation of the laser beam. In this case, the velocity of the translational movement of the laser beam was only V=0,003 m/s, and the corresponding elapsed time is about 4 minutes 10 seconds. Thus, the addition of rotation of the laser beam is allowed to perform the desired contour cut more than 8 times faster.

1. The method of laser cutting metal or alloy, including preliminary construction of the calibration curve according to the cutting depth of the sample of a given metal or alloy on the parameters of the incident surface of the laser radiation, such as the cutting width and the radius of the beam of laser radiation under monotonic increase mentioned specific capacity values from 0.1 j/cm2·to the value at which there is a through cut, and the penetration of the metal or its alloy in the cut line beam of laser radiation, moving the beam of laser radiation translational speed V and simultaneously rotating it with radius the R with angular speed ω, in this case, the radius R and the angular velocity of rotation ω of the laser radiation can be chosen according to the following equation:
R=d/2-r, µm;
ω>V/2r,
where d is the width of the cutting beam of the laser radiation, microns;
r is the radius of the beam of laser radiation microns;
V is the velocity of the translational movement of the beam of laser radiation, m/S.

2. The method according to claim 1, characterized in that the through-rez perform continuous laser radiation.

3. The method according to claim 1, characterized in that the through-rez perform pulsed laser radiation with a pulse duration of 5 NS to 100 μs.

4. The method according to claim 1, characterized in that the through-cut is carried out by progressively moving the beam of laser radiation with a speed of 0.1-20000 mm/s



 

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