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Like other molecular lasers, the working principle of CO2 laser is also complicated in its stimulated emission process. In the discharge tube, a direct current of tens of mA or hundreds of mA is usually input. During discharge, nitrogen molecules in the gas mixture in the discharge vessel are excited by the impact of electrons. At this time, the excited nitrogen molecules collide with CO2 molecules. The N2 molecule transfers its own energy to the CO2 molecule. The CO2 molecule changes from a low energy level to a high energy level, forming a population reversal to generate laser light. The CO2 laser cutting machine uses a focusing lens to focus the laser beam on the surface of the material to melt the material. At the same time, the coaxial laser cutting gas blows away the molten material, so that the laser beam and the material move relatively along a certain path. Form a cut of a certain shape to achieve the purpose of cutting.
In industrial production, laser cutting accounts for more than 70% of laser processing, and laser technology has become the mainstream cutting technology. CO2 laser cutting machines can cut wood, acrylic, PP, plexiglass and other high-quality non-metallic materials. CO2 sheet laser cutting machines are constantly improving. According to different product application fields, they can be divided into low-end, mid-end and high-end, forming Different levels of product ladder structure, many companies at home and abroad have been engaged in the production of various CO2 laser cutting machines to meet market demand.
Then there was the problem of not including solid-state laser cutting machines and fiber laser cutting machines. Choosing a suitable CO2 laser cutting machine still dazzles many consumers. As consumers, how to choose the machine that suits us, because whether it is from the work done before buying or choosing the machine on site, there are some minefields that can be avoided.
We need to compare these various cutting machines, such as cutting accuracy, cutting efficiency, maintenance cost, service life, etc.
a. Cutting accuracy
Cutting accuracy is the basis for selecting machine tools. The difference between a machine tool and a poor machine tool is whether the accuracy of the high-speed cutting parts changes significantly, and whether the uniformity of the workpiece changes greatly when cutting at different positions.
b. Cutting efficiency
Cutting efficiency is the core profit index for evaluating machines. Cutting efficiency refers to the time to cut the workpiece.
c. The main structure of the equipment
CO2 laser includes mechanical parts, electrical parts, optical parts, peripheral parts and metal plate parts. The biggest maintenance cost of the laser cutting machine mainly comes from the maintenance cost of the laser; the electrical cabinet supplies power to the control part and the motor. In the electrical cabinet, there are switching power supply, driver, filter, relay and control board; the optical components are mainly laser power supply, laser tube, three mirrors, focusing mirror, two mirror frames, one laser head and two laser tube brackets. .
d. Service life
Service life is the core cost-saving indicator for evaluating machines. The main factors that determine the service life of the machine are as follows. The first is the rigidity of the machine, that is to say, the heavier the tonnage, the better the rigidity. The second is the accessories of the machine, especially the brand and quality of the transmission. The third is the level of manufacturing, technology accumulation and inheritance of technical experience.
e. Nesting software
Material utilization has a huge impact on cutting costs. Improving material utilization and reducing material costs are the most important aspects of control. There are many types of nesting materials used in lasers. Multiple nesting platforms are nested separately, resulting in low profit margins and low overall utilization. The unified nesting software is adopted, and the laser cutting machine’s own nesting platform is integrated, so that various CNC cutting equipment can become a common nesting software, which can greatly improve material utilization and programming efficiency, and optimize management.
Advantages of CO2 laser cutting machine in industrial applications:
In the field of plastic cutting, one of the main advantages of plastic CO2 laser cutting machines is the ability to complete cutting of highly complex parts at a very fast speed without stress and deformation of the workpiece. It is very good at cutting polyester and polycarbonate materials.
In glass cutting, laser processing has excellent processing quality of color filters, liquid crystal and ITO conductive glass, high processing edge strength and wide application, and can complete all processing tasks in a single step.
In the field of die cutting, most models use acrylic sheet, which is very effective for cutting with CO2 laser cutting equipment. Laser cutting is also common in movie special effects companies and theme park design companies.
In terms of cutting the metal casing of mobile phone batteries, due to the widespread use of mobile phones, the environmental protection recycling of mobile phone batteries has attracted everyone’s attention. Laser cutting of metal casings outside of mobile phone batteries can be used for recycling to effectively meet market demand.
Factors Affecting the Cutting Quality of CO2 Laser Cutting Machine
Excitation model: CO2 lasers use electrodes to excite carbon dioxide gas to generate laser light. According to the installation position of the metal electrodes, they can be divided into DC excitation and RF excitation.
Laser frequency: Laser output is divided into pulse output and continuous output. Lasers used for cutting and welding mainly adopt the pulse output mode. Pulse frequency mainly affects cutting speed and notch roughness.
Beam divergence angle: The influence of beam divergence angle on cutting quality is reflected in the width and slope of the cut. The narrower the divergence angle, the narrower the slit width, the smaller the inclination, and the higher the quality.
Laser power: Another power indicator is power stability. It has to be a good cut for excellent cut quality. Long-term production is also a very important test for lasers.
Post time: Aug-06-2023
