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The so-called thermal cutting, from the perspective of the way, including flame cutting, plasma cutting and laser cutting three, according to the cutting requirements and the market price, the three cutting methods currently occupy a certain market, the comparison of its technical economics are as follows:
Flame cutting is a common way of roughing steel plates. Due to the effects of air pressure, cutting tip height, and preheating time, flame cutting has a large scale of deformation of the entire cutting material, which cannot meet the need for high-precision cutting, and the cutting speed is low. At the same time, it takes time to warm up before cutting. It is difficult to adapt to the needs of unmanned operations. Flame cutting is the oldest type of thermal cutting. Its cutting metal thickness is from 1mm to 1.2m, but when most of the low carbon steel plates you need to cut are less than 20mm thick, other cutting methods should be used. Flame cutting utilizes the high temperatures generated during the combustion of iron oxides to cut carbon steel. The design of the flame torch provides sufficient oxygen for the combustion of iron oxide to ensure good cutting results.
Plasma cutting has the advantages of high cutting speed and wide range. It is suitable for cutting low-thickness metal plates and various non-metallic materials. The maximum cutting speed can reach 10m/min, which is 10 times that of flame cutting. Cutting underwater can eliminate the noise generated during cutting, dust, harmful gases and arcs, which is conducive to environmental protection requirements. With the maturity of high-power plasma cutting technology, the cutting thickness can reach 130mm. High-power plasma cutting with water jet technology has made the cutting quality close to the lower limit of precision of laser cutting (±0.2mm). Plasma cutting with different working gases can cut all kinds of oxygen cutting hard-to-cut metal, especially for non-ferrous metals (stainless steel, aluminum, copper, titanium, nickel) cutting effect is better; its main advantage lies in cutting metal of small thickness When the plasma cutting machine is fast, especially when cutting ordinary carbon steel sheets, the speed can reach 5-6 times that of the oxygen cutting method, the cutting surface is smooth, the thermal deformation is small, and there is almost no laser beam cutting in the heat affected zone. A focused high power density laser beam is used to irradiate the workpiece to rapidly liquefy, evaporate, ablate, or burn the irradiated material, while at the same time blowing away molten material by means of a high-speed air stream coaxial with the beam, thereby cutting the workpiece. Because the laser cutting machine is expensive, and currently only suitable for thin plate cutting (usually thick plate punching time is long), and fine plasma cutting machine cutting precision can reach the lower limit of laser cutting, the cutting surface quality is similar, but the cutting cost is much lower than the laser The cutting is about 1/3 of the way, and the maximum cutting thickness can reach 12mm. Therefore, replacing the expensive laser cutting machine with a fine plasma cutting machine is beneficial to the high-speed fine cutting of medium and thin plates with a large amount in the most economical way. . In addition, CNC plasma cutting and automatic nesting programming software can improve the material utilization rate of 5% to 10%, annual cutting 20 million tons, then the steel can save 100 to 200 million tons, worth billions of dollars. Therefore, the development trend of replacing the flame cutting machine and the laser cutting machine with a numerical control plasma cutting machine has appeared in industrialized countries.
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