In the early 1990s, due to the increasing demand for material processing, laser marking, a new technology developed after laser welding, laser heat treatment, laser cutting, laser drilling and other application technologies, began to become an indispensable processing method. Laser marking technology has become the most extensive and mature technology in the field of laser processing with its new non-contact, non-polluting and wear-free marking process.
The core of the laser marking device is the laser marking control system. Therefore, the development of laser marking is the development process of the marking control system. In just 7 years, the control system has experienced large-format era, mirroring era and galvanometer era in the field of laser marking. The control method has also undergone direct control from software to upper and lower machine control, and finally to real-time processing. A series of evolutions of time-sharing.
Project principle: The laser marking system is mainly composed of Advantech industrial computer, laser, galvanometer scanning system and f-θ lens. The schematic diagram of the system structure is shown in the following figure:
The power system is connected to the industrial computer and (gas/solid) laser by 220V (50Hz), and the industrial computer controls the galvanometer scanning system and laser power through laser marking software. When preparing for the marking operation, the industrial computer sends a signal to the power supply system to control the laser switching light and the laser power level, and at the same time, according to the marking coordinate data, a certain transformation is transmitted to the galvanometer scanning system, and the galvanometer scanning system is received according to the receiving. The signal is adjusted for the X /Y axis galvanometer, which deflects the X / Y axis galvanometer lens at a certain angle. At this time, the complete optical path is that the beam emitted by the laser is refracted by the X and Y galvanometers and then incident on the surface of the workpiece to be marked.
System Features: In this system, Advantech IPC is mainly used to transmit and process laser marking signals, and coordinate various parts of work through timing functions. Due to the high performance requirements of laser marking, the choice of industrial computer is the key, not only requires fast response, but also has the characteristics of stability, safety and anti-interference, so as to produce normally in the harsh working environment. The industrial computer mainly accomplishes the following tasks in the laser marking system:
1. The main switch of the power system is turned on. After the operator has set the relevant parameters on the industrial computer, the hardware of the system is completely controlled by the industrial computer.
2. The industrial computer extracts the marked coordinate data and converts it into an angular deflection signal that can be recognized by the galvanometer system through a certain algorithm.
3. When the single character marking is completed, the industrial computer should control the Q-switching parameter to turn off the laser. At this time, the laser is still in operation; after completing the entire marking task, the laser power is set to 0, thereby completely turning off the laser.
4. The industrial computer should timely monitor and control the marking process and store the information records.
Project evaluation: After 10,000-character marking production verification, it achieved high control accuracy requirements and accurately fulfilled customer needs.
1. High stability: Due to the use of highly reliable Advantech original machine for processing, the stability of the system is enhanced;
2. Flexible configuration: adopts distributed structure and flexible configuration;
3. Cost-effective: Advantech IPC has better scalability and reasonable use of various methods to optimize the cost of the entire system.
