As the laser cutting machine belongs to the category of hot processing, it is easy to burn edge and hang slag if the air pressure or piercing mode is incorrect during cutting, which not only affects the accuracy and beauty of the product but also reduces the product quality. bring great economic losses to the enterprise.
So, how to effectively avoid and deal with this problem?
First of all, we need to find out the reasons for the burning edge processed by the metal laser cutting machine:
Metal laser cutting machine will generate a lot of heat when machining sheet metal. Under normal circumstances, the heat generated by cutting will spread along the slit to the machined sheet metal to be fully cooled.
In the processing of the small hole in the metal laser cutting machine, the outside of the hole can be fully cooled, but the small part of the hole on the inside of the single hole has a small space for heat diffusion, and the heat energy is too concentrated, which leads to overburning, slagging and so on.
In addition, in thick plate cutting, the accumulation of molten metal and heat accumulation on the material surface during piercing will lead to auxiliary airflow disorder and excessive heat input, resulting in overheating.
Solution
1. The solution of overburning in small hole cutting of carbon steel by metal laser cutting machine: in the cutting of carbon steel with oxygen as auxiliary gas, the key to solve the problem is how to restrain the oxidation reaction heat.
The cutting method of auxiliary oxygen during piercing and lagging switching to auxiliary air or nitrogen can be used.
This method can process the small hole of 1 stroke 6 thick plates up to.
The pulse cutting condition with low frequency and high peak output power can reduce the heat output, which is helpful to the optimization of the cutting condition.
If the condition is set to a single pulsed laser beam, high peak output with high energy intensity and low frequency, the accumulation of molten metal on the material surface during piercing can be effectively reduced and the heat output can be effectively suppressed.
2. The solution of metal laser cutting machine in the cutting of aluminum alloy and stainless steel: in the processing of this kind of material, the auxiliary gas used is nitrogen, and the edge burning will not occur in the cutting, however, because the temperature of the material on the inside of the small hole is very high, the phenomenon of hanging slag on the inside will be more frequent.
The effective solution is to increase the pressure of the auxiliary gas and set the condition to the pulse condition of high peak output and low frequency.
The auxiliary gas will not overburn when using air as when using nitrogen, but it is easy to hang slag at the bottom, so it is necessary to set the condition to the pulse condition of high auxiliary gas pressure, high peak output, and low frequency.
