Plasma cutting machine cutting specificationsThorpe
The advantage of the plasma cutting machine is that the plasma arc energy is more concentrated, the temperature is higher, the cutting speed is faster, the deformation is small, and the materials such as stainless steel and aluminum can be cut.
The insufficiency of plasma cutting is that the arc is strong, the noise is loud, the dust is much, and there is a certain pollution to the environment. For medium and thick, many underwater plasma cutting is used, and the cutting thickness is also limited. Similarly, gas flow, arc length, telegraph quality, current magnitude, and cutting speed all affect quality, and it is not as easy to grasp as it is. The plasma cutting gun should not be more, because the cutting speed is faster, it is easy to be affected by the above factors, and the cutting quality is different. Generally speaking, for thin plate cutting, the surface quality of the plasma cutting incision is superior to that of the fire filling, and the hanging residue is rare.
Plasma cutting machine production application
In recent years, foreign manufacturers have developed a new technology called fine plasma or high-precision plasma, which has been introduced by domestic manufacturers. The effect is better. By improving the design of the cutting moment, the quality of the cutting surface of the workpiece is significantly improved, and the verticality of the edge can reach 0-1.5°, which is particularly advantageous for improving the cutting quality of the thick plate. Due to the improved cutting gun, the electrode life is increased several times. However, the distance between the cutting gun and the steel plate is relatively high, and the height sensor on the cutting gun is required to be more sensitive, and the torch lifting reaction is faster.
Therefore, the use of plasma cutting 4-30 mm steel plate is an ideal method to avoid the shortcomings of slow cutting speed, large deformation, severe cut of the incision and serious slag. A blank of a certain thickness of stainless steel or the like is obtained.
No-load voltage and arc column voltage
The plasma cutting power supply must have a high enough no-load voltage to easily induce arcing and stabilize the plasma arc. The no-load voltage is typically 120-600V, and the arc column voltage is typically half of the no-load voltage. The metal plate can significantly increase the power of the plasma arc, thus increasing the cutting speed and cutting thickness. The arc column voltage is often not achieved by adjusting the gas flow rate and increasing the electrode internal shrinkage, but the arc column voltage cannot exceed 65% of the no-load voltage, otherwise it tends to the plasma arc constant.
Increasing the cutting current also increases the power of the plasma arc, but it is limited by the maximum allowable current. Otherwise, other plasma arc columns become thicker, the slit width increases, and the electrode life decreases.
Increasing the gas flow rate can increase the arc column voltage and enhance the compression of the arc column, so that the plasma arc energy is more concentrated and the ejection force is stronger, thereby improving the cutting speed and quality. The column becomes shorter and the loss loss increases, so that the cutting ability is weakened until the cutting process is not performed normally.
The so-called shrinkage refers to the distance from the electrode to the end of the cutting tip. The proper distance can make the arc get a good compression in the cutting nozzle, and obtain a plasma arc with high energy concentration and high temperature for effective cutting. If the distance is too large or too small, the electrode will be severely burned, and the cutting nozzle will burn out and the cutting ability will decrease. The amount of shrinkage is generally 8-11mm.
This distance is generally 4 to 10 mm. It has the same amount of shrinkage as the electrode, and the distance should properly exert the cutting efficiency of the plasma arc, otherwise the cutting efficiency and the cutting quality are reduced or the cutting nozzle is burned out.
The above various factors directly affect the compression effect of the plasma arc, that is, the temperature and energy density of the plasma arc, while the high temperature and high energy of the plasma arc determine the cutting speed, so the above various factors are related to the cutting speed. This guarantees that this not only increases the size, but also reduces the amount of deformation of the cut parts and the heat affected area of the slotted area. If the cutting speed is reduced, the effect is reversed, and the size of the slag is increased, and the cutting quality is lowered.