CNC Plasma Cutting Machine Technical Application and Precision Machining

Ⅰ. Technical application of CNC plasma cutting machine

As an important application classification of thermal cutting processing, CNC plasma cutting machine has a good performance in cutting efficiency and cutting accuracy, but according to the current operation of most domestic production enterprises in China, few can really achieve high-quality and efficient operation. There are few, what limits the operation level of the enterprise CNC plasma cutting machine. The analysis of CNC cutting machine manufacturers believes that it is mainly reflected in two aspects:

1. The height and stability of the cutting nozzle;

2. The matching of cutting speed and working air pressure.

The parts cut by the CNC plasma cutting machine can be directly welded and applied without machining. But CNC plasma cutting machine uses plasma arc for cutting, which is compared with oxygen cutting. There are still some defects, mainly reflected in the large inclination of the cutting surface, and the finish is not as good as oxygen cutting. The main criteria for evaluating the quality of CNC plasma cutting are: the inclination of the cutting surface, the depth of the cutting line, and the amount of slag. Through a series of cutting tests, it can be proved that the cutting quality has been significantly improved.

In addition, in order to improve the cutting quality, we have carried out a comprehensive cutting test, analyzed and sorted out the test data, and obtained some of the best working parameters of the CNC plasma cutting machine.

The CNC plasma cutting machine can cut workpieces with complex shapes, and has the advantages of fast cutting speed, high efficiency, good cutting surface quality, accurate cutting size, and small thermal deformation of the workpiece.

The inclination of a high-quality cutting surface should be below 30, the depth of the cutting lines should be below 0.15 mm, and the slag should be less and easy to remove.

When the height of the cutting nozzle from the steel plate is controlled by the arc voltage height controller, because the dynamic positioning accuracy can reach +0.013, it can ensure that the height of the cutting nozzle and the steel plate remains unchanged, so the inclination of the cutting surface is small and Uniform and good finish.

When adjusting the height of the cutting nozzle from the steel plate by hand, the steel plate to be cut should be placed as flat as possible to reduce the adjustment times of the cutting torch and ensure the stability of the cutting torch during the cutting process.

CNC plasma cutting machine is a kind of advanced mechatronics equipment for cutting metal sheet, which has been widely used in shipbuilding, machinery manufacturing and other industries.

There are many factors that affect the cutting quality of CNC plasma cutting machine. In addition to the design parameters of the cutting machine, it is also related to operation control and cutting process.

Ⅱ. Precision machining of CNC plasma cutting machine

CNC plasma cutting machine is a special equipment for plasma arc cutting under high temperature and strong electric field conditions. High-speed airflow, high-temperature, high-speed plasma arc flame flow melts the workpiece metal, and is blown away from the substrate to form a slit.

Since the arc column temperature greatly exceeds the melting point of metals and their oxides, CNC plasma cutting machines can also be used to cut stainless steel, aluminum, copper and other metals in addition to cutting carbon steel.

The application classification of CNC plasma cutting machines based on technical applications is mainly distinguished by the composition of the plasma arc. Here is a simple classification description for everyone as follows:

1. Conventional plasma arc cutting.

2. Double gas plasma arc cutting.

The torches use plasma gas and shield gas, respectively. The function of shielding gas is to effectively isolate the cutting area from the outside world, so as to obtain better cutting edge quality. According to the characteristics of the material to be cut, the combination of different gases can be changed to achieve the best cutting effect.

3. Water jet plasma arc cutting.

During the cutting process, the cooling water is sprayed from the small hole in the torch nozzle to the arc, and the plasma arc is compressed again to further increase its density and temperature, so as to improve the cutting speed and cutting quality.

4. Long-life oxygen plasma arc cutting.

Long-life oxygen plasma arc cutting is a novel plasma arc cutting technology for cutting carbon steel. The most prominent advantage is that the electrode has a long life. Compared with ordinary oxygen plasma, the average life is extended by 4 to 6 times, and the number of perforations is increased by nearly 10 times.

5. Fine plasma arc cutting.

The plasma arc current density is extremely high, so it has a very narrow and straight plasma flame, narrow kerf, smooth cutting surface, vertical kerf edge, cutting accuracy and surface quality close to laser cutting.

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