Burr refers to various sharp corners, burrs and other irregular metal parts at the transition of workpiece surface during laser cutting. Burr is one of the common phenomena in laser cutting, and it is also the two unsolved problems “generation and control of burr” in the research of metal cutting theory. Burrs directly affect the dimensional accuracy, form and position accuracy and surface roughness of the workpiece to be machined.
Cutting samples with Longtai fiber laser cutting machine
1、 Reasons for burr of sheet metal processed by laser cutting machine:
The main reason for the burr of the sheet metal processed by the laser cutting machine: when the laser cutting machine is processing the workpiece, the high energy generated by the laser beam illuminating the workpiece surface makes the workpiece surface vaporize rapidly and evaporate to achieve the purpose of cutting. Tihao Machinery is the main product of the company with rotary center, lead screw, shaft processing, CNC lathe processing, tool handle and cutter bar, and collet connecting rod. However, there is a core device that we must pay attention to, namely, auxiliary gas. The auxiliary gas is used to blow off the slag on the surface of the workpiece after the surface of the workpiece is gasified. If the auxiliary gas is not used, the slag will form burrs attached to the cutting surface after cooling. This is the main cause of burrs.
Another reason is the quality of the equipment itself, as well as the parameter setting factor. After the customer purchases the laser cutting machine, the professional operator must debug the equipment.
Sample display of laser cutting machine
Solution for burr of sheet metal processed by laser cutting machine:
1. Be sure to equip air compressor and use auxiliary gas for cutting.
The purity of the gas should be high. You can change to a gas supplier with better quality. The purity of the gas is very important. It is better not to use the cylinder gas, because after twice filling, the purity is not good and the gas is wasted.
For example, for laser cutting stainless steel, nitrogen is recommended as the auxiliary gas. Nitrogen is a flame retardant gas. During laser processing, nitrogen not only prevents the explosion of laser cutting, but also prevents the heated end face from instant oxidation, and the cut end face will be more smooth and bright. The auxiliary gas shall be adjusted to the pressure of 12-15kg. The nitrogen under this pressure will not completely prevent combustion, but also can quickly blow away waste impurities to remove burrs.
2. Find a professional operator to debug the parameters of the metal laser cutting machine. The cutting operation of the metal laser cutting machine can be successfully completed until it is normal.
Some parameter setting factors of the laser cutting machine will also affect the appearance of molten slag, which will lead to burr of the metal laser cutting machine. Therefore, the cutting parameters should be adjusted to the best. The cutting speed of the air pressure flow focal length should be adjusted for many times. The parameters provided by the machine can not cut beautiful workpieces.
The laser cutting machine is a precision machine, and its operation is also a fine work. Often a data error will cause its work to run abnormally. Therefore, it should be strict and fine in work to reduce and avoid errors. The equipment+gas+parameters are adjusted to the best, and the workpiece cut is free of burrs, which makes the cutting of the laser cutting machine more quality.
Burrs only occur in metal cutting, and there is no burr problem in non-metallic cutting. How are burrs produced? In fact, burr is the excessive residue particles on the surface of metal materials. If a material has burrs, it can be qualitatively defective. The more burrs, the lower the quality.
2、 According to the working principle of the laser cutting machine, the causes and solutions of burrs are analyzed and obtained:
1. The upper and lower positions of the beam focus deviate. Solution: Adjust the focus position according to its offset position.
2. The output power of the machine is not enough. Solution: Check whether the laser cutting machine works normally. If it is abnormal, timely repair and maintenance are required. If it is normal, check whether the output value is correct.
3. The wire cutting speed of the cutter is too slow. Solution: timely adjust and improve wire cutting speed.
4. The purity of the auxiliary gas of the cutter is not enough. Solution: Explain how to improve the purity of auxiliary gas.
5. The addition point of the laser beam of the cutting machine has shifted. Solution: debug the focus and adjust it in time.
6. The laser cutting machine is unstable due to too long operation time. Solution: Turn off the machine and restart it and let it rest.
The metal laser cutting machine is a precision machine, and its operation is also a fine work. Often a data error will cause its work to run abnormally. Therefore, it should be strict and fine in work to reduce and avoid errors.
