Laser processing is a processing method in which a laser is used as energy to melt and then form a material. According to the purpose of processing, it can be divided into laser cutting, laser marking, laser welding, laser cladding, laser additive manufacturing and so on. The temperature of the laser can reach 6000°, and the material can instantly melt or even vaporize the material. As a typical hot working, the heat affected zone is small, the processing speed is fast, and it is not necessary for subsequent processing after molding, and is particularly suitable for a thin plate or a material which is easily deformed by heat. Considering the safety of lasers and the high efficiency of laser processing, laser processing is usually automated and assisted in processing tasks efficiently.

The basis of laser processing is the laser processing system. Wuhan Wanlilai's 10,000-watt processing system integrates laser cutting, welding, welding and scanning and welding. It is a master of laser processing system.

A complete laser processing system including lasers (including fiber, chiller and regulated power supply), laser head, motion mechanism (robot or machine tool), working platform, other auxiliary equipment (IPC, dryer, auxiliary water, etc.) ). The following is a brief introduction to the laser, laser head and motion mechanism.

Laser is the core of laser processing. At present, fiber laser is mainly used, its beam quality is good, electro-optical conversion efficiency is high, maintenance-free, suitable for processing various materials.

At present, mainstream lasers include CO2 lasers, fiber lasers, semiconductor lasers, and disc lasers.

The single direction is the main characteristic of the laser. Based on this, different sizes of light spots can be output by optical transmission, which is suitable for different processing. In addition, the concentration of laser energy makes the laser penetrating ability strong, and is suitable for the processing of thick plates.

The laser processing system adapts to the structural characteristics of the workpiece to form its motion mechanism, usually using machine tool processing. At present, the mainstream processing method is machine tool processing, which has high processing precision and good stability, and is mainly used for two-dimensional processing, including laser drilling. Marking, laser cutting, laser welding; using mechanical arm, flexible, easy to achieve three-dimensional processing, including three-dimensional laser cutting, laser welding, etc.; processing accuracy is worse than machine tool accuracy, better flexibility, relatively small footprint.

The laser head is a terminal mechanism for laser processing output light energy. Through the combination of optical lenses, the laser is first expanded, and then the laser is amplified by an optical lens. According to the function of laser processing, it can be divided into laser cutting head, laser welding head, laser welding head, scanning laser head, laser marking head and so on.

Ordinary laser cutting heads, with a blowing nozzle, use high pressure to blow out the material melted by the laser to form a slit. At present, the laser brazing head used in the mainstream of automobile factories has the function of automatic laser focusing, which is more conducive to the stability of laser processing. The scanning laser head can utilize the rotation of the lens angle and the movement of the position to ensure that the spot size of the laser acts on the workpiece is constant, and through precise control, the circular and straight segments can be realized under the premise that the posture of the laser head is not changed. Weld structure of type C and other structures.

Robot application

The invention of the steam engine partially liberated the human hands, making the industrial revolution a possibility; the invention of the generator, the electric power to replace the manual work of the people; the invention of the computer, etc., the mechanical installation of the brain, bringing the mechanical speed Great improvement; the popularity of smart factories in the future will make manufacturing no longer subject to standardized products, but will be based on the individual needs of people, through intelligent control of the entire industry chain, greatly satisfying individual needs, and Can effectively improve the production efficiency of the product. The application of robots is a foundation for intelligent manufacturing.

At present, mainstream robot manufacturers include Germany KUKA, Japan's FUNAC, Sweden's ABB, and China's Shougang's Motoman and Shenyang Xinsong robots. The robot is mainly composed of two parts, including hardware (mainly the robot arm of the robot, including the reducer, encoder, etc.) and software (the controller of the robot body).

Industrial robots have the following three functions:

1. Movement function (reaching at any point within the reachable space);

2. Signal exchange and function realization (signal exchange with other equipment, control the opening and closing of other equipment, or be controlled by PLC to realize functions together with other equipment);

3. Simulation and trajectory simulation (through simulation and trajectory simulation, study the accessibility of robot trajectory, CT cycle time, etc.).

Regarding the selection of robots, consider the following questions:

1. Brand and pricing;

2. Load: the six-axis load weight and moment of inertia of the robot;

3. Number of axes: the number of axes of the robot arm;

4. Itinerary: the maximum path interval that the robot can reach;

5. Accuracy: the accuracy of reaching a certain point and the positioning accuracy of repeated motion;

6. Installation method: horizontal or inverted;

The main applications of robots are as follows: spot welding, handling, spraying, cutting, gluing, etc.

Robot vision

Robot vision is a system that makes the robot have a visual perception function and is one of the important parts of the robot system. Robot vision can acquire a two-dimensional image of the environment through a vision sensor, and analyze and interpret it through a visual processor to convert it into a symbol, allowing the robot to recognize the object and determine its position. The robot vision hardware mainly includes image acquisition and visual processing, and the image acquisition is composed of illumination system, visual sensor, analog-to-digital converter and frame memory. According to different functions, robot vision can be divided into visual inspection and visual guidance. It is widely used in industrial sectors such as electronics, automobiles, machinery, and medical and military fields. In the automotive industry, robot vision is often used to read vehicle types and measure the size of the body.

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