Views: 46 Author: Site Editor Publish Time: 07-13-2021 Origin: Site
Laser marking machine marking is under the action of a high-energy laser beam to cause the processed workpiece to undergo physical and chemical reactions such as melting, vaporization, heating and discoloration, thereby leaving a permanent mark on the surface of the workpiece. According to the different working methods of laser marking, laser marking machine can be divided into three types: mask symbol method, dot matrix symbol method and galvanometer scanning symbol method. Let's analyze it in detail by Leapion Laser Manager.
The mask symbol method is also called "projection symbol method". It means to engrave the numbers, characters, pictures, etc. to be typed into a mask on a template. The pattern on the mask is imaged onto the workpiece through the lens. Mask marking usually uses CO2 laser and excimer laser.
The main advantage of mask marking is that one laser pulse can produce a perfect symbol that contains several types of fits. Therefore, the marking speed is fast and it is suitable for a single type and a large number of commodities.
Disadvantages: Due to the messy mask manufacturing, it is not suitable for marking with messy pictures and frequent changes. Mask marking usually uses CO2 laser and excimer laser.
The dot matrix notation method refers to the use of one or several small lasers to emit pulses together. After passing through the mirror and the focusing lens, one or several laser pulses ablate small pits of uniform size and depth on the surface of the marking material. ; Each picture and character are made up of these small round pits.
The dot matrix method has a slower symbol speed and is suitable for symbols in flat pictures (such as photos), but the gap is not smooth when the text symbols are enlarged.
Lattice marking generally uses low-power radio frequency CO2 lasers.
The galvanometer symbol method is to inject a laser beam into two mirrors (galvanometers) and use a computer to control the scanning mirrors. These two mirrors can separate the lead XY axis scanning, and print numbers, text, graphics, etc. on a determined plane . The area of the symbol can be large or small, several small parts can be marked together, or multiple texts and pictures can be drawn for one part symbol.
In short, the galvanometer scanning method uses the laser "pen" to write on the workpiece to be processed. The advantage is that this method uses the computer's high-end graphics system to deal with graphics, has the characteristics of high drawing efficiency, good graphics accuracy, etc. and can expand and reduce graphics without distortion and deformation. However, in the actual processing of scanning symbols, in addition to the elements of the data, parameters such as the resolution of the marking area, laser power, and marking speed will affect the quality, and the various parameters are mutually effective and restrict each other.
For the galvanometer laser marking machine, the symbol method can be divided into two categories: laser ablation and laser ablation.
Laser etching is the vaporization of metal materials from time to time when the peak power of the laser beam is high. Laser burning is when the peak power of the laser beam is low, combined with the effect of CO2 in the air, the laser irradiates the surface of the workpiece to form a colored metal oxide film. The beam is controlled by a computer, and the symbol produces clear text and graphics. NdYAG lasers are often used for scanning marking.
The scanning marking system consists of a computer, a laser and an XY scanning mechanism. Its working principle is to input the information to be marked into the computer. The computer controls the laser and XY scanning mechanism according to the pre-designed program, so that the high-energy laser spot transformed by the special optical system scans and moves on the processing surface to form a mark.
Mechanical scanning marking is: the XY coordinates of the mirror are moved mechanically to change the position where the laser beam reaches the workpiece. The XY scanning mechanism of this marking system is usually equipped with a plotter.
The working process is: the laser beam is turned to the optical path through the reflector, and then shot on the workpiece through the light pen (focusing lens). Among them, the pen arm of the plotter can only move back and forth along the x-axis together with the reflector; the light pen and its upper reflector (all fixed together) can only move along the y-axis.
Among the three marking methods, the galvanometer scanning marking method has developed into the current mainstream marking method. Because galvanometer scanning marking is widely used, and the scale of the symbol is adjustable, the symbol speed is also faster. The above are the 3 laser marking methods that Leapion Laser shared with you today. If you want to know more professional questions, please contact Leapion Laser directly. Leapion Laser 7×24 hours online service!
