Lasers were called "problem-solving tools" shortly after they were born. Scientists have realized from the beginning that strange things like lasers will become the most important technical factor of this era. So far, with only a few decades of initial application, lasers have had a major impact on our lifestyle.
Laser marking (engraving) technology
Laser marking (engraving) technology is one of the largest application areas of laser processing . Laser marking (engraving) is a marking method that uses a high-energy-density laser to locally irradiate a workpiece, vaporize the surface layer material, or chemically change the color reaction, leaving a permanent mark. Laser marking (engraving) can print a variety of characters, symbols and patterns, and the character size can be on the order of millimeters to micrometers, which has special significance for product anti-counterfeiting.
The focused ultra-fine laser beam is like a tool, which can remove the surface material of the object point by point. Its advanced feature is that the marking process is non-contact processing, which does not produce mechanical compression or mechanical stress, so it will not damage the processed object. The laser focused size is small, the heat affected area is small, and the processing is fine. Therefore, some processes that cannot be achieved by conventional methods can be completed.
The "tool" used in laser processing is the focused light spot. No additional equipment and materials are needed. As long as the laser can work normally, it can be continuously processed for a long time. Laser processing is fast and low cost. Laser processing is automatically controlled by a computer, and no human intervention is required during production.
What kind of information a laser can mark is only related to the content designed in the computer. As long as the artwork marking system designed in the computer can identify it, the marking machine can accurately restore the design information on a suitable carrier. So the function of the software actually determines the function of the system to a large extent
Laser cutting technology
Laser cutting technology is widely used in the processing of metal and non-metallic materials, which can greatly reduce processing time, reduce processing costs, and improve workpiece quality. Modern lasers have become the "sword" of "iron shaving like iron" as people dream of pursuing.
Taking the CO2 laser cutting machine of Han's Laser Co., Ltd. as an example, the entire system is composed of control system, motion system, optical system, water cooling system, smoke exhaust and blowing protection system, etc., adopting the most advanced numerical control mode to achieve multi-axis linkage and laser Iso-energy cutting not affected by speed, at the same time supporting graphics formats such as DXP, PLT, CNC and strengthening interface graphics drawing processing capabilities; using imported servo motors and transmission-oriented structures with superior performance to achieve good motion accuracy at high speeds. Laser cutting is achieved by applying high power density energy generated after laser focusing. Under the control of the computer, the laser is discharged by pulses, thereby outputting a controlled repetitive high-frequency pulsed laser beam, forming a beam of a certain frequency and a certain pulse width. The pulsed laser beam is transmitted and reflected through the optical path and focused by the focusing lens group. On the surface of the processed object, fine, high-energy-density light spots are formed, and the focal spot is located near the surface to be processed, melting or vaporizing the material to be processed at an instant high temperature. Every high-energy laser pulse instantly sputters a small hole on the surface of the object. Under the control of the computer, the laser processing head and the material to be processed are continuously moved relative to each other according to a pre-drawn pattern. This will process the object into The desired shape. When cutting, a coaxial air stream is emitted from the cutting head, and the molten or vaporized material is blown out from the bottom of the cut (Note: If the blown gas and the material being cut have a thermal reaction, this reaction will provide cutting Additional energy required; airflow also cools the cut surface, reducing heat-affected zones and keeping the focusing lens free from contamination). Compared with traditional sheet processing methods, laser cutting has high cutting quality (narrow cut width, small heat affected zone, smooth cut), high cutting speed, high flexibility (can cut arbitrary shapes at will), and a wide range of materials Adaptability and other advantages. Laser welding is one of the important aspects of the application of laser material processing technology. The welding process is thermally conductive, that is, the surface of the workpiece is heated by laser radiation, and the surface heat is diffused to the inside by thermal conduction. By controlling the width, energy, peak power and repetition frequency of the laser pulse, etc. Parameters to make the workpiece melt and form a specific molten pool. Due to its unique advantages, it has been successfully used in welding of micro and small parts. The advent of high-power CO2 and high-power YAG lasers has opened up new areas of laser welding . Deep penetration welding based on the theory of pinhole effect has been obtained, and it has been increasingly used in industrial sectors such as machinery, automotive, and steel. Compared with other welding technologies, the main advantages of laser welding are: fast laser welding , large depth, and small deformation. It can be welded at room temperature or under special conditions, and the welding equipment is simple. For example, the laser beam passes through the electromagnetic field, and the beam will not be shifted; the laser can be welded in the air and a certain gas environment, and can be welded through glass or a material that is transparent to the beam. After the laser is focused, the power density is high. When welding high-power devices, the aspect ratio can reach 5: 1 and the highest can reach 10: 1. It can weld refractory materials such as titanium, quartz, etc., and can weld different materials with good results. For example, welding two materials with very different properties, copper and tantalum, the pass rate is almost 100%. Miniature welding is also possible. After focusing, the laser beam can obtain a small spot and can be precisely positioned. It can be used for the assembly welding of micro and small components in mass automated production. Laser welding, not only has high production efficiency, high, and small heat-affected zone, the welding spot is not polluted, which greatly improves the welding quality. It can weld hard-to-reach parts, and performs non-contact remote welding with great flexibility. The use of optical fiber transmission technology in YAG laser technology has made laser welding technology more widely popularized and applied. The laser beam is easy to achieve beam splitting according to time and space. It can perform simultaneous processing of multiple beams and multi-station processing, which provides conditions for more precise welding.