Author: DAHENG IMAGING Date: 2025-04-25
Industry: Consumer Electronics Industry
Project: Vision-Guided Laser Deburring for Nanocrystalline Magnetic Shielding Sheets
Technology Type: Vision-Guided
Background
Currently, wireless charging technology has been widely adopted in portable terminals, smartphones, digital cameras, and other electronic devices.
The working principle of wireless charging involves generating a magnetic field around the charging base’s coil when energized. The coil in the device senses this magnetic field and induces a current to charge the battery. Ensuring effective energy transfer and minimizing energy loss during wireless charging has become a critical challenge for domestic electronic manufacturers in this field.
Regarding this issue, the mainstream solution currently available in the domestic market is to apply magnetic shielding materials on the back of the coils at both the transmitting and receiving ends of the wireless charger. Nanocrystalline magnetic shielding sheets, a type of magnetic material composed mainly of nanocrystalline materials, they possess high saturation magnetization, low loss, and excellent thermal conductivity. They can effectively reduce energy loss during the wireless charging processenhance charging efficiency.Their functions of concentrating magnetic flux, shielding magnetic fields, and conducting magnetic flux can help customers improve the efficiency of wireless charging, reduce heat generation, and minimize electromagnetic interference.
Project Challenges
Since the nanocrystalline magnetic shielding sheets are installed in smart devices, their thickness and precision must meet strict stringent requirements. During manufacturing processes such as heat treatment, coating and laminating, covering, and die-cutting, there will be burrs-like at the edges of the products. If this residues are not precisely removed, they will affect the overall performance when they are assembled into the finished smart devices. Therefore, a vision system is required to accurately identify burrs positions and guide the laser processto remove the residual burrs.
Case Overview
To guide the laser process in precisely removing residual burrs, high pixel-resolution cameras are essential.DAHENG IMAGING selected the Mercury II series MER2-U3 20-megapixel area scan camera, which meets the requirement for imaging the largest sample (55mm diameter) in this project. Integrated with a HALCON algorithm package for secondary development, the system provides solutions for overall contour positioning and laser marking guidance. It accurately distinguishes burrs within product tolerances and extracts the actual edge contours. For clients seeking reduced cycle time (CT), the vision system can focus solely on extracting burr-cutting areas, guiding the laser to achieve "precision targeting," thereby lowering costs and enhancing efficiency.
Visual system schematic diagram
Partial objects shooting effect
Local defect image
Inspection effect illustration
External contour extraction schematic
External contour extraction schematic
Burr-only cutting effect schematic
Related Products
Address：12F Daheng Science & Technology Tower, No.3 Suzhou Str., Haidian District, Beijing China
E-mail：isales@daheng-imaging.com
