Laser cutting machine in the use of the process of the most likely to encounter a few problems, you hit?

It is inevitable that problems occur in the use of laser cutting machine, so how to solve these problems? Take a look at the following 7 questions. Have you encountered them in the process of operation?

1. Cutting punch technique. Any thermal cutting technique, except in a few cases where it starts at the edge of the board, usually requires a small hole in the board. Before the laser stamping compound machine is to use the punch to first out of their own a hole, and then we use the laser from the small hole development research cutting. There are two basic ways to penetrate a laser cutter without using a perforator:

Blasting perforation – The material is irradiated by a continuous laser to form a crater in the center of the material, which is then quickly fused and removed by a stream of oxygen coaxial with the laser beam. In general, the size of the hole is related to the thickness of the plate. The average diameter of the blasting hole is half of the thickness of the plate. Therefore, the diameter of the blasting hole of the thicker plate is larger rather than circular, which is not suitable for the parts with higher machining accuracy requirements. Just scrap. In addition, because the oxygen environmental pressure used by the enterprise is the same as that when cutting, splash has a greater impact.

Pulse Punch – Uses a peak-power pulsed laser to melt or evaporate a small amount of material. Air or nitrogen is often used as an auxiliary gas to reduce hole expansion caused by exothermic oxidation. The gas pressure is less than the oxygen pressure during cutting. Each pulse carried out by the laser produces only a small jet of particles, progressively developed in depth, so we need a thick plate perforating time in a few seconds. Once perforating is complete, cut with oxygen instead of auxiliary gas. Such a perforation diameter has less effect and its perforation quality is superior to blasting perforation. The laser used for laser cutting should not only have high output power, but also have the temporal and spatial characteristics of the beam, so the general cross-flow CO2 laser can not meet the requirements of laser cutting. In addition, it is necessary to have a more reliable gas path control management system to realize the different types of gas, gas pressure switching and punching time control.

In order to obtain high quality cutting, attention should be paid to the transition technology from pulse punching when the workpiece is at rest to constant speed continuous cutting. Theoretically speaking, it is usually possible to change the cutting technical conditions of the enterprise acceleration section, such as focal length, nozzle position, gas pressure, etc., but in fact, it is not possible to change more than one of these conditions because the working time is too short. In industrial production, it is feasible to change the average laser power by changing the pulse width, pulse frequency, pulse width and pulse frequency. The analysis of actual research results shows that the third method has the best effect.

2. Deformation analysis of keyhole cutting process. This is because Chinese machine tools (only for these high-power laser cutting machines) can not take blasting perforation when machining keyholes, but use pulse perforation (soft piercing), which makes the laser energy development in a small area of children is too concentrated, and the non-processing enterprise area is burnt. Cause hole deformation, affect the quality of production and processing products. At present, in the process of machining, pulse punching (soft punching) method should be changed to blasting punching (ordinary punching) method to solve this problem. And for a small power laser cutting machine is just the opposite, in the hole processing should take different pulse perforation methods in order to develop a better surface finish.

3 laser cutting low carbon steel burr problem solution, according to the basic principle of CO2 laser cutting work and teaching design, analysis can be concluded that there are the following reasons is the enterprise caused by the workpiece to produce burr the main problem cause: laser focus up and down position is not correct, need to do a focus position test, according to the social focus of the offset adjust in time; The output power of the laser is not enough, we need to check whether the staff of the laser generator can be normal, if not normal, then observe whether the output numerical method of the laser technology control system button should be correct, to be adjusted; The linear speed of cutting is too slow, so it is necessary to increase the linear speed in the actual operation risk control. The purity of cutting gas is not enough, the need to develop to provide economic high quality cutting management working environment gas; Laser focus offset, need to do focus position test, according to the focus of the offset is constantly adjusted; When the machine tool runs for a long time, the teacher needs to shut down and restart.

4 laser cutting stainless steel and aluminum zinc plate workpiece burr analysis, the emergence of these situations, the first need to consider cutting low carbon steel when burr factors, but it is inevitable to simply speed up the cutting speed, because can increase the speed of development sometimes plate cutting does not wear the situation, this teaching situation is particularly important in processing aluminum zinc plate. At this time, we should consider whether the nozzle should be replaced, the unstable movement of the guide rail and other factors to solve.

5 laser is not completely cutting through the state of analysis, analysis can be found through the following several different situations are the main development of instability affecting the processing quality: the selection of laser head nozzle and processing plate thickness does not match; Laser cutting line speed is too fast, need our operating system control ability to reduce the line speed; The nozzle induction is not allowed to lead to the laser focus position error is too large, need to start again to detect the nozzle induction data, especially when cutting aluminum is most likely to lead to.

6 low carbon steel cutting spark abnormal processing this development will affect the parts of the cutting surface finish processing product quality. If other parameters are normal, the following conditions should be considered: The NOZZEL of the laser head is lost. Replace the nozzle in time. In the absence of a new nozzle to replace the case, should increase the cutting management working environment gas through the pressure; The thread between the nozzle and the laser head is loose. At this time, we should immediately suspend cutting, check the working state of the laser head connection, and re-thread

7. Protect the lens to produce water mist in the laser cutting machine cutting process, auxiliary gas is essential! Among them, oxygen and nitrogen are commonly used in our country. Of course, the higher the purity of gas, the better the quality of cutting will be. There are many customers want to save the cost of air cutting, but there is always fog protecting the lens in the process of cutting, cutting quality is very poor, why?

First of all, give us all the popularization, the role of auxiliary gas: 1. To blow away the residue, to achieve the best cutting effect. 2. Use the gas to blow away the metal melt