Do you know how to control the starting height of the laser cutting machine?

The starting height of the laser cutting machine actually has a very important influence on its starting cutting effect, so you must not ignore the control of its starting height when operating it. What can generally be done to ensure its cutting effect? You can follow the editor and take a look at the detailed introduction of the following article, it should be of some help.

The cutting speed of the laser cutting machine is generally determined by the size of the plasma power supply, including the thickness of the workpiece to be cut, the adjustment of the air pressure, including the system operation during cutting, etc. The difference between the plasma CNC cutting machine and the flame cutting machine is that the plasma cutting machine is Controlled cutting is completed by voltage arc starting, then the nozzle height adjustment of the plasma cutting gun is directly related to the processing effect of the workpiece. Generally, the nozzle height refers to the distance between the nozzle end surface and the cutting surface, which constitutes a part of the entire arc length.

Since plasma arc cutting generally uses a power supply with constant current or steep drop characteristics, after the nozzle height increases, the current change is small, but the arc length will increase and the arc voltage will increase, thereby increasing the arc power; but at the same time It will also increase the arc length exposed to the environment and increase the energy lost by the arc column.

Regarding the height of the starting point of the laser cutting machine, we generally suggest to analyze it from the following two aspects:

1. The role of the arc column is often completely offset by the arc length, which will reduce the effective cutting energy and reduce the cutting ability. The usual performance is that the blowing force of the cutting jet is weakened, the residual slag in the lower part of the incision increases, and the upper edge is overmelted and rounded.

2. Considering the shape of the plasma jet, the diameter of the jet expands outward after it leaves the muzzle. The increase in nozzle height will inevitably cause the width of the cut to increase.

Therefore, choosing the smallest possible nozzle height is beneficial to increase the cutting speed and cutting quality. However, if the nozzle height is too low, it may cause double arc phenomenon. Using ceramic outer nozzles can set the nozzle height to zero, that is, the end face of the nozzle directly touches the surface to be cut, and good results can be obtained.

At the same time, regarding the processing speed of the laser cutting machine, we need to comprehensively analyze the following aspects:

1. The model of the plasma cutting machine, this model is generally the output current of the plasma cutting machine, such as 40A, 60A, 100A, 200A, etc. (Of course, some imported plasmas such as German Kelby, American Femat and other brands The model is not based on the output current, so I won’t go into details here.) Depending on the power of the model, the selected cutting current is different, and the cutting speed is not the same. The above data does not indicate you What brand and model of plasma cutting machine is selected, so detailed data cannot be given;

2. The material of the plasma cutting workpiece is different. According to different cutting materials, the cutting speed is also different. Common cutting materials: carbon steel, stainless steel, the cutting speed is faster, cast iron is slightly slower, followed by aluminum, and the slowest is copper , Because copper and aluminum are more difficult to cut, the cutting speed is much slower than the first two, and the cutting thickness of copper and aluminum with the same power is much smaller than that of stainless steel and carbon steel.

3. The size of the input voltage of plasma cutting site, the general factory power supply voltage is AC 380V, but due to the different conditions of each factory site, the general voltage fluctuates between 365V and 410V (of course, the difference is even greater in some places). Therefore, the input voltage is also a factor that affects the cutting speed

Generally, as long as you operate according to the above content, you don't have to worry that the starting height of the laser cutting machine is difficult to control. In most cases, there will be no accidents.

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