Operators of CNC plasma cutting machine are clear, if CNC plasma cutting machine nozzle appears damaged, it is easy to lead to no arc in the plasma processing process, to prevent this situation, in the use of CNC plasma cutting machine electrode cutting nozzle, how to use the electrode cutting nozzle more flexible.
Causes and solutions of electrode cutting nozzle loss in CNC plasma cutting machine
In the process of NC plasma cutting machine, under normal conditions, the service life of a set of electrode cutting nozzle is about 3-4 hours. In order to reduce the cost of consumables, many users buy electrode cutting nozzle with low price and poor quality. This method will only aggravate the loss of cutting nozzle, and it is easier to burn the cutting gun, which will bring some uncertain safety hazards, so we do not recommend this How to do it. In order to reduce the loss of electrode cutting nozzle, we summarized the following solutions in the long-term after-sales work with customers
Method 1: remove the oxide from the air or oxygen nozzle
When air or oxygen plasma is used in the nozzle, oxide will accumulate in the nozzle, which will affect the air flow and increase the service life of consuming parts. Wipe the inside of nozzle with clean flannelette to eliminate oxide.
Second, reflect on the air flow and cooling methods every day
One of the most rare reasons for cutting torch damage is the short cooling flow. The air flow, air pressure or cooling liquid required for cutting torch are often reflected. If the air flow is insufficient or leakage is found, the machine should be shut down immediately to clean up the problem.
The third method is to inject hardened water into the cutting torch
Hard water will precipitate metal impurities on the nozzle ring, which will affect the air flow, reduce the quality of the cutting torch and prolong the service life of the parts.
Method 4: ensure the correct pressure and activity of plasma
It is very important to correct the pressure and movement of plasma to counteract the service life of consumable parts. If the air pressure is too high, the life of the electrode will be greatly increased; if the air pressure is too low, the life of the nozzle will be affected.
The fifth method is to adopt reasonable cutting distance
According to the requirements of the application specification, the reasonable cutting distance should be adopted. The cutting distance is the interval between the cutting nozzle and the surface of the workpiece. When piercing, the interval of twice the normal cutting distance or the maximum height that can be transferred by plasma arc should be adopted as far as possible.
Method 6: do not overload the nozzle
Overloading the nozzle (i.e. exceeding the task current of the nozzle) will quickly damage the nozzle. The current intensity should be 95% of the task current of the nozzle. For example, the current intensity of 100A nozzle should be set to 95A. Method 7: the perforation thickness should be within the allowable range of the machine parts. The cutting machine can not pierce the steel plate beyond the task thickness. The usual perforation thickness is 1 / 2 of the normal cutting thickness.
Method eight, adhere to the dry and clean plasma gas
Plasma system needs dry and clean plasma gas to be able to work normally. Dirty gas is usually the result of gas compression, it will prolong the service life of consuming parts, forming abnormal damage.
Method 9, prevent the extension of the plasma arc. If the plasma arc can only contact the surface of the workpiece by extending, this kind of extension and extension will occur at the beginning and end of the cutting, which will cause abnormal damage to the nozzle. If we adopt the right edge terminal technique and choose the appropriate “arc breaking” signal time, this result can be prevented.
Method 10, cutting should start from the edge, as far as possible from the edge of the beginning of cutting, rather than perforation cutting. Using the edge as the starting point will extend the service life of the workpiece. The correct way is to align the nozzle with the edge of the workpiece indirectly and then start the plasma arc.
Therefore, in the purchase of CNC plasma cutting machine, we should pay attention to whether the cutting gun and electrode cutting nozzle match. In addition, the appropriate cutting thickness of nozzles with different apertures is also different. Therefore, before the cutting task of CNC plasma cutting machine, the electrode cutting nozzle with cutting ability and plate to be cut should be selected.
ken.tang @ chengcg.com
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