分类： 网络与安全
2012-03-29 14:36:33
The laser is a laser device in the heart, plays a decisive role on the quality of laser cutting. A good laser, should have the ideal model, stable power and other factors. Many types of lasers, can it have different definitions from different perspectives. To distinguish from the incentives of the media, can be divided into solid-state lasers and gas lasers, which are solid or gas as the medium, such as the first laser using ruby as the media. Mainstream lasers used for laser cutting carbon dioxide laser, followed by a YAG laser. YAG laser has a high photoelectric conversion efficiency, small size, but due to the loss of energy pumping source is fast, high maintenance cost factors so that the application has been largely restricted. The carbon dioxide laser, it is easier to obtain the desired laser mode and higher energy, combined with stable performance, shorter downtime, which is widely used in the cutting of various materials.
A: incentive model. The carbon dioxide laser is the use of the electrodes incentive carbon dioxide gas laser according to the installation location of the metal electrodes can be divided into the DC excitation and RF excitation.
Two: the laser frequency. Points of the laser output pulse output and continuous output, used for cutting and welding laser pulse output, the roughness of the cutting speed and incision of the main effects of pulse frequency, high-speed cutting, high frequency is essential. Most manufacturers of CO2 laser frequencies less than 5000Hz.
: Beam divergence angle. Beam divergence from the strict perspective, does not belong to the laser part of the content, but because of the laser mode a great influence on the far-field divergence angle, so we put it here to discuss. The beam divergence angle on the cutting quality is reflected in the width and slope of the incision, the smaller the divergence angle of incision width is more narrow, the smaller the slope, and thus the higher the quality.
4: laser modes. Is one of the most important indicator to measure laser quality. Can be divided into single-mode, fundamental mode and multimode. Fundamental mode, both the TEM-00 mode, it is the index of X and Y axis are 0, so is an ideal dot. By TEM-00 mode of the laser can get the smallest beam diameter, minimum kerf and faster cutting speed cutting because of its small spot. The multi-mode are non 0 index in the XY direction, the poor beam quality, is generally used instead of cutting and welding.
Five: laser power. Peak power, energy stability, and other factors. Different power to cut through the thickness of sheet metal cutting, 4KW laser, for example, it can be cut into 20mm thick carbon steel plate, or 15mm stainless steel, 10mm aluminum alloy; more than 5KW laser cutting 25mm thick carbon steel , stainless steel up to 20mm. Another indicator of the power is the power stability, excellent cutting quality, must be a good incision throughout. Long-term production of the laser is also a very important test. DC excitation laser, resulting in long-term state power attenuation due to electrode erosion. In addition, because some of the laser vacuum pumps and turbine pumps using the lubricating oil for lubrication, resulting in oil pollution laser cavity, shortened the laser life.
