Foreword
The Vehicle Identification Number (VIN) has unique worldwide vehicle identification. In the automotive body-in-white production process, the VIN code must meet certain requirements. To monitor the quality of VIN code laser marking, inspection is necessary. Due to material and other factors, marked characters may vary in height and depth. The VIN code laser marking process is thermal and prone to defects. Real-time 3D depth detection of marking results is needed. Newlaz VIN Code Laser Marking Character Depth Detection System measures the depth of laser-marked characters. Through sampling and measurement, the depth variation and average depth of each character can be calculated accurately.
I. System Introduction
The system mainly includes a 3D camera, an industrial personal computer (including the vision software:NewVision-M3), and a robot (PLC equipment, optional). The system topology is shown in the figure below. The high-resolution 3D camera realizes high-precision point cloud data acquisition of the characters. The control cabinet (including the industrial personal computer) connects the robot and the vision communication, controls the camera image acquisition and character information output. The vision measurement software NewVision-M3 realizes the character depth measurement and the detection of foreign objects on the marking surface (before marking).
Ⅱ.advantages of system
- Data density: Intensive 3D point cloud with high-precision and high-speed processing;
- Efficiency: The time consumed for character depth detection and recognition is less than 2 seconds;
- Accuracy: The measurement error of character depth is ± 0.03mm;
- Stability: Multiple repeated measurements, with a repeated error of ± 0.01mm;
- Adaptability: Good compatibility with plate heat deformation, rough edges, etc.;
- Traceability: The detection results can be uploaded to the MES system to support traceability;
- Multiple interfaces: Support various communication protocols, such as Ethernet, DeviceNet, etc.;
- Expandability: Support various types of cameras, and can adapt to different installation requirements and image acquisition fields of view;
- Customization: Customized dust-proof design for the camera to effectively prevent splashes or dust generated during marking from adhering to the camera lens
III. Applicable Scenarioses
- Whether the characters are polished has basically no influence on the measurement results, and the measurement deviation before and after polishing is ≤ 0.01mm;
- The robot’s moving speed has basically no influence on the measurement results. The measurement deviation at the speed of 20 – 100mm/s is ≤ 0.02mm;
- Unevenness/inclination of the marking surface has basically no influence on the measurement results;
- The jitter of the robotic arm will affect the imaging stability, but it has basically no influence on the measurement results.
Conclusion
Newlaz VIN Code Laser Marking System and VIN Code Laser Marking Character Depth Detection System, adopt non-contact marking, featuring clear marking and high efficiency. The depth and width of the characters comply with the requirements of vehicle manufacturers and relevant regulations, achieving the integration of marking and detection.
