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Stainless steel laser cutting machine is a kind of laser cutting machine that uses a fiber laser generator as a light source. The fiber laser is a new type of fiber laser newly developed in the world. It outputs a high-energy density laser beam and gathers it on the surface of the workpiece. The spot irradiation position is moved by the numerical control mechanical system, and the area irradiated by the ultra-fine focus spot on the gasification workpiece is instantly melted and automatically realized. cut.

Stainless Steel Laser Cutting Machine

Discuss laser equipment cutting perforation skills

Any thermal cutting technique, except in a few cases where it can start from the edge of the board, usually has to cut a small hole in the board. On a laser stamping compound machine, the hole is first punched with a punch, and then the laser is used to start from the hole.

Therefore, the stainless steel laser cutting machine without punching equipment has two perforation methods:

Pulsed Perforation – Select high power pulsed lasers to melt or vaporize a few materials, usually using air or nitrogen as an assist gas to reduce hole expansion caused by thermal oxidation, and the gas pressure is less than the oxygen pressure at the time of cutting. Only small particle eruptions occur with each pulsed laser and gradually deepen, so it takes a few seconds for the thick plate to perforate.

Once the perforation is complete, cut the assist gas with oxygen immediately. In this way, the perforation diameter is small, and the perforation quality is better than that of explosive perforation. Therefore, the laser used should not only have high output power, but also have the temporal and spatial characteristics of the beam; in addition, there should be a more reliable gas circuit control system to complete the switching of gas species, gas pressure and perforation time. control.

【Explosion Perforation】-The material forms a pit in the middle after continuous laser irradiation, and then the molten data is quickly removed by an oxygen flow coaxial with the laser beam to form a hole. Generally, the size of the holes is related to the thickness of the plate. The uniform diameter of the blast perforation is half the thickness of the plate. Therefore, the hole diameter of the explosion perforation of the thick plate is large and not round, so it should not be used for parts with high machining accuracy, but only for scrap. In addition, since the oxygen pressure used for perforation is the same as for cutting, the spatter is larger.

When laser processing stainless steel and aluminum-zinc sheet, the workpiece has burrs

In this case, the element of burr when cutting stainless steel should be considered first, and the cutting speed cannot be simply accelerated, because the addition speed sometimes cannot cut the plate, especially when processing galvanized steel sheet. At this time, other elements of the fiber laser cutting machine should be considered, such as whether the nozzle is replaced, the movement of the guide rail is unstable, etc.

Stainless Steel Laser Cutting Machine Sample

Analysis of Small Hole Deformation During Cutting Process

This is because the machine tool does not use the method of explosive perforation in the processing process, but adopts the method of pulse perforation, so that the laser energy is too concentrated in a very small area, burning the non-processing area, causing the deformation of the hole and affecting the processing quality. At this time, the pulse piercing method should be changed to the explosive piercing method during processing. Instead, low-power fiber laser cutters should use the pulsed piercing method for better surface finish.

Solve the problem of abnormal sparks in low carbon steel machining

This condition affects the machining quality of the part’s cut and section finish. When other parameters are normal, the following issues should be considered:

Loss of the laser nozzle? The nozzle should be replaced in time. In the absence of a new nozzle replacement, the body pressure should increase;

Is the thread at the connection between the nozzle and the laser head loose? At this time, the cutting should be stopped immediately, and the connection of the laser head should be checked, and there is a good thread from the head.

Causes of workpiece burrs when laser cutting mild steel

According to the operation and planning principle of stainless steel laser cutting machine, the following reasons are analyzed:

1. The up and down orientation of the laser focus is incorrect, and it needs to be tested and adjusted according to the offset of the focus;
2. If the laser output power is not good, it is necessary to check whether the operation of the laser generator is normal. If it is normal, check whether the output value of the laser control button is correct, and then adjust it;
3. The tangent speed is too slow, and the line speed needs to be increased during operation;
4. The purity of the cutting gas is not good, and it is necessary to provide high-quality cutting gas;
5. If the laser focus is shifted, it is necessary to test the focus orientation and adjust it according to the focus shift;
6. The instability of the machine tool running for too long needs to be shut down and restarted.

When the laser is not fully incised

After analysis, we can find that the following situations are the main reasons for unstable processing: the selection of the laser head nozzle does not match the thickness of the processing plate; the laser cutting line speed is too fast, and the line speed needs to be reduced during control; the nozzle induction is forbidden to guide the direction of the laser focus Too much error requires checking the nozzle sensing data from scratch, especially when cutting aluminum.