I. Overview CNC plasma cutting technology is a combination of numerical control technology, computer software and hardware technology, plasma cutting technology, precision machinery technology in one of the high-tech. The development of CNC plasma cutting machines can completely change the level of equipment in the domestic thermal cutting industry, reverse the current low efficiency, poor quality, labor intensity, low material utilization rate, and poor environmental conditions in the thermal cutting industry, narrowing the gap with foreign advanced countries. difference. At the same time, the development of CNC plasma cutting technology can bring related fields and disciplines to the international advanced level.
Flame cutting, plasma cutting and laser cutting are the three main methods of thermal cutting. The technical and economical comparisons are shown in the following table.
Flame cutting has the advantages of large cutting deformation and can not meet the need of high-precision cutting, and the cutting speed is low. Before cutting, it needs to be warmed up and takes time, which is difficult to adapt to the needs of unmanned operation. Plasma cutting has a wide range of cutting, can cut all metal plates and many non-metallic materials, the maximum cutting speed of up to 10m/min, is 10 times the flame cutting. Cutting underwater can eliminate the noise, dust, harmful gas and arc generated during cutting, which is conducive to the protection of the environment and meet the environmental protection requirements of the 21st century. With the maturity of high-power plasma cutting technology, the cutting thickness has reached 130mm. High-power plasma cutting with water jet technology has made the cutting quality close to the lower limit of laser cutting (±0.2mm). 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%, and annual cutting of 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. Therefore, research and promotion of numerical control plasma cutting technology is of great significance.
Second, China's CNC plasma cutting technology development China's CNC flame cutting technology started in the mid-1980s, and CNC plasma cutting machine is even later, most of the CNC plasma cutting machine to economical machine tools (MCU as the core, stepper motor Mainly for driving components). There were once more than 50 manufacturers who had once engaged in the manufacture of CNC cutting machines in China, and their power was dispersed. Many of the manufacturers' predecessors were welding and cutting tools factories, and their technical foundation was poor. Throughout the 1980s, domestic companies were unable to compete with foreign companies in terms of product structure or production scale.
After entering the 1990s, some domestic companies aimed at the world advanced level and continuously developed new products for CNC cutting machines. Moreover, the main technical indicators of some products have reached the advanced level of similar foreign equipment. At the same time, with the regulation and control of the market economy, Domestic manufacturers of CNC cutting machines have been adjusted to more than 20 companies. However, it is only Messer Cutting & Welding Co., Ltd., Shanghai Isahancock Co., Ltd., Harbin Huaqi Welding & Cutting Equipment Co., Ltd., Harbin Sihai CNC Machinery Manufacturing Co., Ltd., and Shenzhen Bo. Lichang CNC Cutting Equipment Co., Ltd., Wuxi Hualian Welding and Cutting Equipment Factory, Beijing Baihui Hongda Technology Co., Ltd. and several other companies. They generally have independent scientific research and development capabilities, large-scale production, complete product specifications, variety, quality and stability, high credibility. Therefore, they often win in tendering activities. The single output is generally more than 30 or more than 40 units, and some even exceed 100 units. Of course, some companies have their own characteristics, even though they are small, and they can adapt to the needs of different companies.
Some domestic CNC plasma cutting products have formed their own unique features in many aspects, achieving "automation, multi-function and high reliability."

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