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The Main Technology Of Laser Cutting Machine
Jul 21, 2017

For example, with 5 〃 lens cut carbon steel, focal depth for the focal length of + 2%, that is, about 5mm. For high-quality cutting, the effective depth of focus is also related to the lens diameter and the material being cut.

Laser cutting machine several hub technology is light, machine, electric integration of integrated technology. The actual focus spot diameter between 0.1 ~ 0.4mm. That is, when the cutting of the distal end of the optical path increases to make the compensation optical path shortened; otherwise when the cutting near the end of the optical path decreases, so that the compensation optical path to maintain the same optical path length. The smaller the focal length of the focusing lens, the smaller the spot spot diameter. In order to reduce the change in the spot spot size caused by the change in the size of the beam before focusing, the manufacturer of the laser cutting system at home and abroad provides some special equipment for the user to use:

Parallel light tube. The details of the laser cutting machine are determined experimentally. As shown in Figure 2. If the focus beam size becomes smaller and the focus spot diameter becomes large, the automatic control of the water pressure changes the focusing curvature to make the focal spot diameter smaller. It is important to control the position of the focus relative to the surface of the material being cut. The larger the diameter of the incident beam, the smaller the diameter of the focal spot. But the cutting splash, the lens is too close to the workpiece lens damage, so the general high-power CO2 laser cutting machine industry applications widely used 5 〃 ~ 7.5 〃 "(127 ~ 190mm) focal length.

The lower axis of a separate moving lens is added to the cutting head, and the Z-axis with the control nozzle to the surface of the material is two independent units.

Laser cutting machine in the industry to determine the focus of the production of a simple way there are three:

Printing method: the cutting head from top to bottom movement, the length of the plastic sheet in the laser beam printing, print the smallest point for the focus.

In the laser cutting machine in the laser beam parameters, machine and CNC system performance and accuracy of a direct impact on the efficiency and quality of laser cutting. Since the energy density is proportional to 4 / πd2, the focal spot diameter is as small as possible to produce a narrow slit; the focus spot diameter is also proportional to the focal depth of the lens.

Flying optical path cutting machine to increase the x, y direction of the compensation optical path system. In particular, for cutting parts with high precision or large thickness, the following key technologies must be grasped and solved: Focus position control technology: One of the advantages of laser cutting is that the energy density of the beam is high, generally 10W / cm2.

For the optical path of the cutting machine, because the beam divergence angle, cutting the proximal and distal time course is different, before focusing the beam size of a certain difference. This is a commonly used method, that is, the output of the CO2 laser with a parallel beam tube for beam expansion processing, beam after the beam diameter becomes larger, the divergence angle becomes smaller, so that the cutting work in the vicinity of the proximal and distal The beam size before focusing is close to the same. Considering the cutting quality, cutting speed and other factors, in principle 6mm metal material, the focus on the surface; 6mm carbon steel, the focus on the surface; 6mm stainless steel, the focus under the surface. The

The laser cutting machine controls the water pressure of the focusing mirror (typically a metal reflex focusing system).

Laser cutting machine Blue spark method: remove the nozzle, blow the air, the pulse laser hit the stainless steel plate, so that the cutting head from top to bottom movement, until the blue spark for the focus.

Slant plate method: with the vertical axis at an angle oblique plastic plate so that the level of pulling, looking for the laser beam at the minimum focus. When the machine table moves or the optical axis moves, the beam moves from the proximal end to the distal F-axis at the same time, so that the spot diameter of the beam is aligned throughout the processing area.