As an efficient and high-precision machining method, laser cutting is widely used in many fields such as metal processing, automobile manufacturing, aerospace, electronic equipment and so on. Its core advantage is that it can accurately cut complex shapes, and all this is inseparable from the key “trajectory tracking” technology in the laser cutting system.
First, the basic concept of trajectory tracking
In the process of laser cutting, trajectory tracking means that the laser cutting head moves accurately according to the preset path (that is, the cutting trajectory) to ensure that the laser beam always cuts along the outline of the design drawing. The accuracy of trajectory tracking directly determines the cutting quality, including notch width, edge flatness, dimensional accuracy and other important indicators.
Second, the key technology of trajectory tracking
1. Numerical control system (CNC)
Laser cutting equipment is usually equipped with a high-precision computer numerical control system, which is responsible for analyzing design drawings (such as CAD files), converting graphics into motion instructions, and controlling the servo motors in X, Y and even Z axes to move accurately, so as to realize accurate trajectory reproduction.
2. Servo control system
The response speed and control accuracy of servo system are important factors affecting the trajectory tracking effect. Modern laser cutting equipment mostly adopts closed-loop servo system, which feeds back the position information in real time through the encoder to ensure that the cutting head always runs according to the preset trajectory.
3. Dynamic compensation technology of laser head.
In the process of high-speed cutting, the laser focus may deviate from the predetermined trajectory due to the influence of acceleration and inertia. For this reason, many high-end devices have introduced dynamic error compensation algorithm and automatic focus adjustment system to ensure that the cutting quality and trajectory accuracy can still be maintained under high-speed movement.
4. Visual guidance system
In recent years, with the development of machine vision technology, more and more laser cutting systems begin to integrate visual recognition modules. The system can capture the position of the workpiece in real time before or during cutting, and dynamically adjust the trajectory, especially suitable for special-shaped workpieces or occasions with large positioning errors.
Third, factors affecting trajectory tracking performance
-Accuracy of mechanical structure: The manufacturing accuracy of guide rail, lead screw and transmission system directly affects the stability of overall movement and the accuracy of repeated positioning.
-Optimization of control algorithm: Advanced control algorithm can effectively reduce trajectory deviation and improve cutting efficiency and accuracy.
-Environmental factors: such as temperature change, vibration, etc., may cause equipment deformation or motion error, which needs to be compensated by the environmental control system.
Fourth, the future development trend
With the advancement of Industry 4.0 and intelligent manufacturing, the future laser cutting trajectory tracking technology will be more intelligent and automated. For example, artificial intelligence algorithm is used to predict and optimize the cutting path, and big data analysis is combined to realize fault early warning and automatic parameter adjustment, which further improves the stability and intelligence level of the cutting process.
tag
Trajectory tracking is an indispensable core link in laser cutting technology. With the continuous progress of technology, the accuracy, speed and automation level of laser cutting will continue to improve, bringing higher production efficiency and product quality to modern manufacturing industry. Mastering and optimizing trajectory tracking technology will be the key to promote the application of laser cutting to a higher level.