Reasons and solutions for the loss of the electrode cutting nozzle of the CNC plasma cutting machine


Regarding the loss of electrode cutting nozzles of plasma cutting machines, it has always been the focus of attention of enterprises, because the electrode cutting nozzles are one of the main consumables for CNC plasma cutting machine processing. Because there are currently different brands of electrode cutting nozzles on the market, imported The price of brand electrode cutting nozzles can cost more than one hundred yuan, so how to reduce the consumption of CNC plasma cutting machine consumables, its significance has also become important.

The personnel who operate the CNC plasma cutting machine know that if the cutting nozzle of the CNC plasma cutting machine is damaged, it will easily lead to no arc during the plasma processing. To prevent this situation, today's hardware accessories processing factory-Tongyang CNC Technology will explain it for everyone When using the electrode cutting nozzle of a CNC plasma cutting machine, how to use it to make the electrode cutting nozzle more useful.

In the processing process of CNC plasma cutting machine, under normal conditions, the service life of a set of electrode cutting nozzles is about 3-4 hours. In order to reduce the cost of consumables, many users buy low-priced and poor-quality electrode cutting nozzles. This method will only aggravate the loss of the cutting nozzle, and it is easier to burn the cutting torch. This will bring some uncertain safety hazards, so it is not recommended to do this. In order to reduce the loss of electrode cutting nozzles, Dongguan hardware accessories processing factory-Tongyang CNC has summarized the following solutions in the long-term on-site after-sales work with customers:

   Method one is to remove the oxides on the air or oxygen nozzles

When air or oxygen plasma is used in   , oxides will accumulate in the nozzle, which will affect the airflow and increase the life of the consumable parts. Wipe the inside of the nozzle with a clean flannel to eliminate oxides.

   Method two, introspect the airflow and cooling flow every day

   One of the rarest causes of cutting torch damage is the lack of cooling flow. It is often necessary to reflect on the air flow and air pressure or coolant to the cutting torch. If the air flow is found to be insufficient or leaking, the machine should be shut down immediately to remove the problem.

   Method three, use hardened water to inject the cutting torch

  Hard water will form metal impurities on the nozzle ring, which will affect the air flow, reduce the quality of the torch and extend the life of the consumable parts.

   Method 4, to ensure the correct pressure and activity of the plasma

   The correct gas pressure of the plasma and the service life of the active components are very important. 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.

   Method 5, use a reasonable cut distance

  According to the requirements of the application specification, use a reasonable cutting distance. The cutting distance is the distance between the cutting nozzle and the surface of the workpiece. When perforating, try to use twice the normal cutting distance or the maximum height that the plasma arc can transmit.

   Method six, do not use the nozzle overload

   Overloading the nozzle (that is, the task current that exceeds the nozzle) will quickly damage the nozzle. The current intensity should be 95% of the nozzle's task current. For example: the current intensity of a 100A nozzle should be set to 95A.

   Method seven, the thickness of the perforation should be within the allowable range of the machine system

  The cutting machine cannot perforate the steel plate that exceeds the task thickness. The usual perforation thickness is 1/2 of the normal cutting thickness.

   Method eight, adhere to the dryness and cleanliness of the plasma gas

  Plasma systems require boring and clean plasma gas to perform their normal tasks. Dirty gas is usually the result of gas compression system, which will extend the service life of consumable parts and cause abnormal damage.

  Method Nine, to prevent the plasma arc from elongating and expanding

   If the plasma arc only needs to be stretched and expanded to contact the surface of the workpiece, this stretching and expansion will occur at the beginning and the end of the cutting of the plasma arc, which will cause abnormal damage to the nozzle. This result can be prevented if the correct edge finish technique is used and the appropriate "arc breaking" signal time is selected.

   Method ten, the cutting should start from the edge

   Try to cut from the edge instead of perforating and cutting. Using the edge as the starting point will extend the life of the wasted part. The correct way is to indirectly aim the nozzle at the edge of the workpiece before starting the plasma arc.

   Therefore, when purchasing a CNC plasma cutting machine, pay attention to whether the cutting gun and the electrode cutting nozzle match. In addition, the suitable cutting thickness of nozzles with different apertures is also different. Therefore, before the cutting task of the CNC plasma cutting machine, it is necessary to select the electrode cutting nozzle with the corresponding cutting ability and the plate to be cut.