The necessity of laser dynamic rotation marking
Laser dynamic rotary marking is to perform laser engraving on arc-shaped workpieces. It uses synchronous tracking to rotate and process. Under the control of software, it cooperates with the circular motion of the rotating motor to complete the marking of arc-shaped workpieces. In the past, conventional laser marking machines did not have a rotation function and could not meet the selective processing requirements of some products. In order to meet the marking needs of different workpieces and different angles, it has become a market requirement to equip a rotating chuck for marking processing.
The rotary chuck is a functional component of a machine tool that clamps and positions workpieces by hydraulic, pneumatic or electric means, using the radial movement of the movable jaws distributed on the chuck body. With the popularization of CNC machine tools and the increasing demand for improving production efficiency, the use of rotary chucks is becoming more and more widespread.
Figure 1 is a schematic diagram of a rotating chuck during laser processing. The chuck is usually a three-claw chuck. The biggest advantage of a three-claw chuck is that it can automatically concentrically align the workpiece with the chuck, has a large clamping range and fast clamping speed. Conventional parts are clamped efficiently and stably using a three-jaw chuck. The laser industry generally uses an electric chuck, which is driven by a motor control system and an electric motor. The clamping and loosening of the chuck is achieved by controlling the forward and reverse rotation of the motor through the switch on the electrical control box. Adjusting the voltage regulating knob on the electrical control box can adjust the driving voltage and change the motor output torque, thereby realizing the chuck. The adjustment of clamping force has the characteristics of high speed, high precision and long service life. "
Processing advantages and process comparison
In the initial stage of laser rotation processing, the processing method is to fix the rotation angle, turn and hit, divide the text during processing, rotate it at a certain angle before processing, for single-line text that can be divided evenly, splicing problems can be avoided. However, if the image files are of different lengths and the arrangement becomes complicated, because the text is forced to be divided at a certain angle, it will inevitably cause splicing problems. Since the splicing accuracy during rotation is low, it cannot be completely connected during processing, which will cause There are obvious splicing marks, and the processing efficiency is generally significantly lower than that of plane processing. It can be seen that the acceleration and deceleration time generated when the motor shaft rotates has a great impact on the overall efficiency.
As shown in the processing method in Figure 2, three grippers are used to fix the sample position so that the laser processing center and the rotation axis remain concentric. After editing the image file, use the software's dynamic rotation marking mode to process directly, and the motor control system will drive The rotating axis rotates synchronously, and cooperates with the processing speed of the galvanometer and the rotation speed of the motor, so that the laser is always processed at the top focal plane of the product, which can effectively ensure the consistency of the processing effect. Moreover, the laser dynamic rotation marking effect is equivalent to that of flat marking, and the connection of image files is smooth, without problems such as breakpoints, repeated segmentation, marking, and splicing.As shown in Figure 3, there is also rotary marking of QR codes. The size of the diagram is 8mm*8mm. For the marking of such curved QR codes, the processing quality of the QR codes can be ensured while ensuring the efficiency and the processing edges. Neat and clear in color contrast, it can be easily identified by scanning with a barcode scanner or mobile phone.
Comparing the splicing mark effects of static and dynamic rotary marking, it can be seen from the effect comparison chart in Figure 4 that static rotary marking has obvious splicing marks, and due to repeated marking at the splicing position, the material will further oxidize and turn yellow. , the overall color is also uneven, and the dynamic rotation processing emits light simultaneously during rotation, which effectively avoids the problems of splicing and yellowing, and the color is uniform and the edges are neat.
Comparing the efficiency of static and dynamic rotary marking, it can be clearly seen from the comparison in Figure 5 that dynamic rotary marking eliminates the acceleration and deceleration process caused by the static rotary marking when the rotating axis is paused during the processing, and continues to be rapid. Compared with static rotary marking, the overall processing efficiency is greatly improved, especially compared with the more complex workpieces in Figure 5, the efficiency improvement is more obvious.
Conclusion
At present, laser dynamic rotation marking is widely used for laser marking of continuous patterns on the arc surface of cylindrical workpieces with light weight and small diameter, or the plane of disc workpieces. The worktable can be rotated 360° to achieve uninterrupted circumferential surface marking. Marking, and is suitable for various light sources such as optical fiber, ultraviolet, green light, etc., and can be switched independently. Rotary marking requirements are already very easy to achieve with current laser processing technology, and the quality of the marking process is getting better and better. Laser dynamic rotary marking is widely used in machinery, stationery, medical, electronic industries, automobile manufacturing, etc. (as shown in Figure 6). Huagong Laser has also been committed to developing laser equipment that is closer to user needs.
