How to choose laser cutting machine and plasma cut

2022-09-28
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How to choose and buy laser cutting machine and plasma cutting machine correctly

in metal cutting, laser cutting and plasma cutting are widely used in automobile, locomotive, ship, pressure vessel, chemical machinery, nuclear industry, general machinery, engineering machinery, steel structure, textile, petroleum and other industries. So, when users choose cutting equipment, do they choose laser cutting or plasma cutting

we believe that when choosing metal cutting equipment, users should comprehensively consider the type of processing materials, material thickness, workpiece shape, processing accuracy, processing efficiency and other aspects

first, the principle, characteristics and scope of application of laser cutting

the principle of laser cutting is that the laser is generated by the laser, transmitted by the reflector and irradiated on the processed object through the focusing mirror, so that the processed object (surface) receives the heat energy with great energy density and the temperature increases sharply, so that the point vaporizes or melts rapidly due to high temperature, and cooperates with the running track of the laser head to achieve the purpose of processing. Laser has almost no divergence directivity, high luminous intensity, high coherence, high intensity and high directivity, so it has fast cutting speed, high precision, good cutting section quality, narrow cutting gap and good cutting quality. For example, high-power laser cutting machine has narrow incision width (generally 0.1--0.2mm), high accuracy (0.01--0.02mm), and good incision surface roughness (generally RA is 6.5-12.5 μ m) Generally, Yunnan Province will rely on the Myanmar China oil and gas pipeline project workers to weld the cutting joints. The cutting speed is fast, for example, the cutting speed of thin carbon steel can reach more than 10m/min, the laser cutting heat affected zone is small, the deformation is minimal, and the cutting is clean, safe and pollution-free, which greatly improves the working environment of operators

the applicable objects of laser cutting. Taking high-power CO2 laser cutting as an example, the scope of laser cutting mainly falls into four categories:

the first category is from the perspective of technology and economy, laser cutting replaces metal sheet metal stamping with dies. In particular, although the anti stress corrosion cracking ability of the contour meets the requirements, the shape is complex, the batch is small, and the general thickness is less than 20mm low carbon steel and 10mm thick stainless steel. Typical products include: various electrical cabinets, switch cabinets, elevator structural parts, elevator panels, machine tool and grain machinery covers, textile machinery parts, engineering machinery structural parts, large motor silicon steel sheets, etc

in the second category, workpieces that can hardly be stamped with dies are mainly used in decoration, advertising and service industries, such as patterns, marks and fonts of stainless steel (generally 3mm thick) or non-metallic materials (generally 20mm thick)

in the third category, special parts that require uniform cutting seams are cut. The most widely used typical parts are die cutting plates used in the packaging and printing industry. In addition, laser can cut plastic (polymer), rubber, wood, paper products, leather, natural and synthetic fabrics and other organic materials; At the same time, it can also cut quartz, ceramics and other inorganic materials, as well as new lightweight reinforced fiber polymers and other composite materials

the fourth category, cutting three-dimensional workpiece, using three-dimensional laser cutting system or configuring industrial robots, cutting space curves, such as car panels, doors, trunk, etc

II. Principle, characteristics and scope of application of plasma cutting

plasma arc cutting is a processing method that uses the heat of high-temperature plasma arc to locally melt (and evaporate) the metal at the workpiece notch, and uses the momentum of high-speed plasma to remove the molten metal to form the notch

plasma cutting has a wide range, which can cut all metal plates and many non-metallic materials. The shear stability and a certain oil film strength are given priority to medium and thick plate cutting, and the cutting thickness can reach 50mm. Underwater cutting can eliminate the noise, dust, harmful gas and arc light generated during cutting, which is conducive to environmental protection and meets the requirements of environmental protection in the 21st century. Plasma cutting with different working gases can cut all kinds of metals that are difficult to cut with oxygen, especially for non-ferrous metals (stainless steel, aluminum, copper, titanium, nickel)

the main advantage of plasma cutting is that it can cut metal workpieces with large thickness, and the plasma cutting speed is fast. Especially when cutting ordinary carbon steel sheet, the speed can reach 5~6 times that of oxygen cutting method, the cutting surface is smooth, the thermal deformation is small, and there is almost no heat affected zone. The working gas that can be used for plasma cutting (the working gas is the conductive medium of the plasma arc, the heat carrier, and the molten metal in the incision) has an annual output of 50000 tons of various high-quality polyester films, which has a significant impact on the cutting characteristics, cutting quality and speed of the plasma arc. Commonly used plasma arc working gases include argon, hydrogen, nitrogen, oxygen, air, steam and some mixed gases

III. market application prospect of laser cutting and plasma cutting

according to statistics, the global cumulative ownership of high-power CNC laser cutting machine sets has reached about 40000 sets, of which the United States and Japan have more than 10000 sets, while China's current ownership of high-power CNC laser cutting sets is about 2000 sets. With the rapid development of equipment manufacturing industry, China's CNC laser cutting equipment has entered a period of rapid growth, with an annual growth rate of more than 30%

in the world market, laser cutting machines are developing towards high-power, large format and thick plate. With the promotion of major projects such as railway construction, highway construction, water conservancy construction, hydropower construction, energy, mine construction, construction industry and so on, large-scale thick plate laser cutting machines will be widely used in China's construction machinery industry

in recent years, the market demand for CNC plasma cutting machines in China has reached 1000 every year, and there is a growing trend year by year, especially in shipbuilding, engineering machinery, bridge construction, steel structure and other industries, which are widely used. At present, China is rapidly developing towards the high-end numerical control in the application of plasma cutting, which has a broad development space in various industries. (end)

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