Detection method of thick metal plate of laser cutting machine

With the change of industrial production requirements, laser cutting has been accepted by more and more sheet metal parts operators as a production and processing method. In the production and processing of the entire printed circuit board of domestic stainless steel plates, there are often cases of poor production and processing in some areas. Laser cutting machines are considered to be the key way to promote the upgrading of traditional manufacturing industries, but they still encounter great shortcomings such as insufficient application and outdated key technologies, and the brands of laser cutting machines on the market are uneven.

   Especially in the whole process of laser cutting of thick steel plates of metal materials, the laser cutting rate will be significantly reduced, the accuracy of the wound will be poor, and it will not be able to compete with the traditional technical market. This situation is sometimes arbitrary, even under good processing equipment conditions. In order to better solve some common failures, they greatly impair all work progress. If the Laser Cutting Machine can get rid of the difficulties in the whole process of laser cutting of thick steel plates, there will undoubtedly be a higher industry prospect.

   The production and processing of hot-rolled strip often encounters laser-cut cross-sections. This kind of laser cutting not only questioned the quality of the finished product, but continued to be accompanied by the appearance of coarse grains and severe sticky slag, thus reflecting the use value of high-priced laser processing machines different from other laser cutting methods. However, if drilling with small output power and single pulse, the time will be longer (1 second), which will result in high output power and low product cost with laser cutting time of 2 seconds.

In the production and processing of thick steel plates, the hole breaking time accounts for a very large proportion. Various laser manufacturers are competing to develop and design the technology of rapid hole breaking. The more symbolic one is high-energy perforation. The advantage of this method is faster. However, the disadvantage is that the huge kinetic energy introduced when the hole is broken can increase the temperature of the plate, which endangers the entire laser cutting process and endangers small production and processing.

   For carbon steel, the key factor in improving the laser cut section is to control the heating of the sheet to ensure adequate ignition of the part directly irradiated by the laser. For stainless steel, the important factors to improve the laser cutting cross section are the improvement of light (improvement of relative aperture) and the reasonable use of auxiliary steam. Smooth laser cutting technology improves oscillator and nozzle results. To put it bluntly, the piercing during peak hours is to use pulsed light during peak hours with a small pwm duty ratio, plus the non-gasoline and diesel fuel ejected from the surface of the raw material, to eliminate the attachment of the edge of the piercing, and control the effective frequency of the single pulse while cooling while piercing.

   Now, in order to improve the processing rate, the metal laser cutting machine mostly adopts the structure of the alias sailing laser light path, that is, the raw material tray does not move, and the production and processing head exercise in all production and processing areas. Its characteristics are that although the time of blasting is slightly longer than 3 seconds, the diameter of the punched hole is small (about 4mm), and there are no appendages on the edge of the punched hole and the heat input is low, which is convenient for all normal laser cutting generation in the next step. The diameter of the output is small (about 4mm), the punched edge has no appendages and the heat input is low, which is convenient for all normal laser cutting in the next step.

   This method, although simple in structure, changes the relative aperture, making the hot-rolled strip appear overpowering when laser cutting is extremely sensitive to depth-of-focus. Selecting the laser light path of equal length can prevent the change of the relative aperture and make the light spot consistent with the relative aperture. In addition, great emphasis is placed on heating, controlling the heating of sheet accumulation, and solving reliability problems more effectively. In order to better compensate for the change in the relative position of the production processing head and the lamp source, manufacturers also try to ensure the consistency of the light spot within the production and processing range, and the application of a variable refractive index mapping mirror is a widely selected method.

   With the innovation of laser equipment, the output power of laser generators used in industrial production will also continue to increase. In the future, laser cutting machines for metal materials will gradually improve the current thickness limit of laser cutting, creating a lot of surprises for industrial production.