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The CNC plasma cutting machine not only greatly improves the utilization of the plate, but also significantly improves the cutting quality and the production efficiency. The number can cut all kinds of parts and has strong versatility. The cutting quality of structural parts directly affects the welding quality of the workpiece and the overall performance of the product.
In fact, whether it is flame, plasma or laser cutting methods, all belong to thermal cutting, and they are also non-contact cutting. Due to no contact, the CNC cutting machine does not generate any drag torque during the cutting process. Therefore, the design of the machine tool can be completely lightened, and the numerically controlled cutting machine can also be lightweight and miniaturized.
CNC cutting machine in the cutting process has a fast cutting speed, small slotting and other characteristics, but many user companies often have a variety of problems in the actual operation process, resulting in the actual cutting speed is limited, cutting too large, cut surface The phenomenon of incomplete and other phenomena, excluding the mechanical breakdown of the CNC plasma cutting machine, etc., the user's enterprise is not properly set in operation, etc. The relevant parameters of the CNC plasma cutting machine will also affect the actual cutting effect. The following will summarize the effects of the actual use experience of the CNC plasma cutting machine. All aspects of the cutting effect, and the majority of users to communicate:
Increasing the cutting current to increase the cutting current can also increase the power of the plasma arc, but it is limited by the maximum allowable current, otherwise it will cause the plasma arc column to become thicker, the kerf width to increase, and the electrode life to decrease.
No-load voltage and arc-column voltage plasma cutting power supplies must have a sufficiently high no-load voltage for easy arc ignition and stable plasma arc ignition. The no-load voltage is generally 120-600V, and the arc-column voltage is generally half of the no-load voltage. Increasing the voltage of the arc column can significantly increase the power of the plasma arc, which can increase the cutting speed and cut a larger thickness of sheet metal. The arc-column voltage is often not reached by adjusting the gas flow and increasing the internal shrinkage of the electrode, but the arc-column voltage cannot exceed 65% of the no-load voltage, otherwise the plasma arc will be unstable.
Increasing the gas flow rate The gas flow rate can not only increase the voltage of the arc column, but also enhance the compression of the arc column so that the plasma arc energy is more concentrated and the injection force is stronger, thereby improving the cutting speed and quality. However, if the gas flow rate is too large, the arc column will become shorter and the loss of heat will increase, which will weaken the cutting ability until the cutting process is not performed properly.
The inner shrinkage of the electrode refers to the distance from the electrode to the end surface of the cutting nozzle. The proper distance can make the arc well compressed in the cutting nozzle, and the plasma arc with high energy concentration and high temperature can be efficiently cut. If the distance is too large or too small, the electrode may be severely burned, the cutting nozzle burned, and the cutting ability may be reduced. Normally, the cutting height is the cutting nozzle height The cutting nozzle height is the distance from the end face of the cutting nozzle to the surface of the workpiece being cut. The distance is generally 4~10mm. It is the same as the internal shrinkage of the electrode, and the distance must be appropriate to fully exert the cutting efficiency of the plasma arc. Otherwise, the cutting efficiency and cutting quality will be reduced or the cutting nozzle will be burned.
The various factors above the cutting speed directly affect the compression effect of the plasma arc, that is, the temperature and energy density of the CNC flame cutting machine, and the high temperature and high energy of the plasma arc determine the cutting speed. Therefore, all the above factors are related to the cutting speed. related. In the premise of guaranteeing the cutting quality, the cutting speed should be increased as much as possible. This not only increases productivity but also reduces the amount of deformation of the cut parts and the heat affected zone of the kerf area. If the cutting speed is not appropriate, the effect is reversed, and the sticky slag will increase, and the cutting quality will decrease.
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