What is high power laser cutting
Use of high energy density laser beams
Thermal cutting of materials as a “cutting tool”
What are the characteristics of laser cutting?
Good cutting quality
High cutting efficiency
Non-contact cutting
Many types of cutting materials
Adaptability and flexibility
What kind of cutting quality is “good quality”
How to solve the bad phenomenon?
See
How Ruike Laser “plays” cutting process
Generally, important process parameters that affect cutting quality include cutting speed, laser power, auxiliary gas, focus position, nozzle characteristics, and material properties. It can be seen that there are many factors that affect the laser cutting process. If improper control or inaccurate parameters are determined, its cutting accuracy and cutting quality will be greatly affected.
Let ’s take a look together
More common in daily processing
Bad cutting phenomenon and solution ~
In actual processing
May encounter a variety of poor cutting
Oxygen carbon steel high power small nozzle
High-speed bright surface cutting technology as an example
May encounter the following situations
The upper stripe and lower drag line of the board are too rough
Possible Causes:
[1] The nozzle selection is too large;
[2] Excessive cutting pressure causes overheating;
[3] The cutting speed is too slow, causing over-burning or too fast, resulting in insufficient cutting;
solution:
[1] Replace small nozzles with suitable nozzles. For example, a 16D carbon steel bright surface cut uses a 1.4D nozzle, and a 20mm carbon steel bright surface cut uses a 1.6D nozzle.
[2] Reduce the air pressure to improve the quality of the cutting section. Generally, the air pressure for bright surface cutting is between 0.6 and 0.8 Bar.
[3] Adjust the cutting speed to a suitable range for the current power (for details, please refer to the full series of cutting parameters of Ruike Laser Continuous Laser)
The upper layer of the board is slightly rough, with slight or deeper teeth, and the lower drag line is better.
Possible Causes:
[1] Nozzle selection is too large;
[2] Insufficient forward defocus;
[3] The cutting speed is slow;
solution:
[1] To achieve full light up and down on the section, consider replacing the smaller size nozzle, such as 1.6D to 1.4D;
[2] With the nozzle diameter unchanged, continue to increase the positive defocus;
[3] Adjust the cutting speed to a suitable range for the current power (for details, please refer to the full series of cutting parameters of Ruike Laser Continuous Laser)
The upper layer has good streaks on the cross section of the board, but the bottom hangs slag and affects the cross section effect.
Possible Causes:
[1] The forward defocus is too large, resulting in a lack of energy concentration and a lagging tail;
[2] Too little air pressure causes cutting trails to form trailing line hysteresis and dross;
[3] The cutting speed is too fast resulting in lag;
solution:
[1] Properly reduce the positive defocus, the other parameters remain unchanged, observe the slag hanging condition at the bottom;
[2] Properly increase the feed pressure, you can try to increase it to about 1Bar at most, and observe the situation;
[3] Adjust the cutting speed to a suitable range for the current power (for details, please refer to the full series of cutting parameters of Ruike Laser Continuous Laser)
In actual processing
When cutting nitrogen stainless steel
Some common problems
Delamination during cutting of stainless steel sheet
Possible causes:
[1] The negative defocus amount is too large, resulting in plasma generation, blue light generation and layering;
[2] The nozzle diameter is too small;
[3] Excessive air pressure feed;
solution:
[1] Reduce the negative defocus, the other parameters remain unchanged, observe the phenomenon;
[2] Replace the nozzle of the larger size;
[3] Reduce the air feed appropriately;
Insufficient cutting when cutting stainless steel plates
Possible Causes:
[1] The nozzle selection is too small;
[2] Insufficient negative defocus;
[3] The gas pressure is insufficient, resulting in insufficient cutting.
solution:
[1] Replace larger nozzles to increase gas flow;
[2] Continue to increase negative defocus to make the cutting section reach the bottom;
[3] Continue to increase air pressure;
The effects of adjusting the pressure and the amount of positive and negative defocus are not obvious
Possible Causes:
[1] When the speed cannot be increased, the laser energy is too concentrated and the reaction with the material is too violent;
[2] The nozzle size is too small, resulting in too little flow;
solution:
[1] When the peak power is constant, reduce the frequency and the duty cycle appropriately. For example, when the speed cannot be increased when cutting 50mm stainless steel, consider adjusting the frequency to about 200Hz. , Can get better cutting effect;
[2] Replace the larger diameter nozzle to increase the gas flow;
How to “play” laser cutting efficiently
See also sharp laser
Increased cutting thickness
——Compared to traditional processing industry
Increased thickness of oxygen-cut carbon steel
——Faster speed and smaller taper
Speed increase of stainless steel sheet
——Lower pressure, faster speed
Carbon steel plate speed increase
——Exhaust oxygen and nitrogen, increase speed more than half