CNC Plasma Cutter

The CNC Plasma Cutting Machine can cut various kinds of complex workpieces with fast cutting speed, high efficiency, good cutting surface quality, accurate cutting size, and small thermal deformation of the workpiece. Due to its high efficiency and good cutting accuracy, it has been widely used in machinery manufacturing, engineering machinery, mining machinery, shipbuilding, pressure vessels and other industries.

Our CNC Plasma Cutting Machine comes with the Start control system, and Phoenix graphic cutting software is installed on the system, which has the characteristics of intuitive human-machine interface and simple and flexible operation. The controller system transmits to the driver through the I/O interface control circuit to control the motor to achieve position control and complete the graphic cutting process.
The torch height control has two main functions, one is to achieve the initial positioning function when the plasma starts the arc, and the other is to achieve automatic control of the torch height during the cutting process. Our CNC Plasma Cutting Machine uses an Automatic arc voltage height controller.

Plasma cutting uses a high-temperature, high-speed plasma arc as the heat source. It uses compressed gas as the working medium. The compressed gas ionizes to form a high-temperature, high-speed plasma arc, which melts (or evaporates) the cut metal locally. High-pressure airflow blows the molten metal away from the substrate to form a narrow and clean cut.

The cutting torch is a key component of CNC Plasma Arc Cutting, which is directly related to the efficiency and quality of CNC Plasma Cutting. The main parts are Electrode, Nozzle, Swirl Ring, Retaining Cap, Shield, Water Tube.

1. The main functions of the nozzle in the cutting torch:
1) The plasma nozzle shrinks and sprays the rotating plasma gas to produce “mechanical compression”, “thermal contraction”, “magnetic contraction” and other effects on the plasma arc column, which increases its energy density and impact force to achieve cutting. purpose.
2) The function of the plasma arc nozzle to produce the pilot arc. The working process is to use the electrode as the cathode and the nozzle as the anode. Under the action of the electric field, the plasma arc is generated between the electrode and the nozzle to generate the pilot arc. When the flame of the pilot arc contacts the arc After the workpiece, the flame current connects the current path between the electrode and the workpiece. At this time, the workpiece replaces the nozzle as the anode, and a plasma arc is generated between the electrode and the electrode. At the same time, the relay cuts off the circuit on the nozzle.
3) The plasma nozzle has high temperature resistance and good thermal conductivity. The temperature of the arc column of the plasma arc is up to 30000C° or more. The arc column passes through the φ2mm small hole of the nozzle, which makes the nozzle temperature very high.
2. The main function of the vortex ring is to generate rotating plasma gas
The plasma jet rotating jet structure is shown in the following figure. It first changes the gas to a tangential jet flow through the vortex ring, and then contracts and jets.

When the plasma gas rotates at a high speed, the centrifugal action causes the lower temperature and higher density gas to move outward, and the higher temperature and lower density gas to move to the middle. This forms a radial external cooling and internal heat in the injection hole of the nozzle. Temperature gradient. This gradient increases the “heat shrinkage” and “magnetostriction” effects of plasma gas on the arc column. Under the combined effect of “mechanical shrinkage”, the plasma arc column has a higher energy density, better straightness, and more impact It can be seen that under other conditions being the same, the higher the rotation speed of the plasma gas flow, the better the shrinkage effect on the plasma arc column.

In the cutting process, it is important to control the height distance between the plasma torch and the workpiece. The height distance not only causes changes in the plasma arc parameters (arc voltage, cutting current), but also directly affects the cutting bevel and surface cutting quality. In the actual cutting process, due to the inevitable deformation of the plate, the cutting height between the torch and the steel plate is constantly changing. To ensure the cutting quality, the torch must be adjusted up and down to stabilize the arc within the normal range Cut.

The cutting height of the torch has a certain proportional relationship with the arc voltage. Using this principle, we usually use the arc voltage to control the height of the torch, which is called arc voltage height adjustment.