The inner liner of a microwave oven usually requires a coating of enamel to enhance its corrosion resistance and cleaning performance. However, during the molding process, sharp corners are prone to accumulate stress, resulting in poor adhesion during subsequent coating application.
Key issues:
Excessive stress at sharp corners causes the enamel layer to crack or peel off easily;
Unsmoothly processed edge burrs lead to uneven coating thickness distribution;
Over time, certain areas of the inner liner will rust prematurely.
Solution for molding:
In the mold design, add a rounded transition process to distribute the stress more evenly;
After molding, combine with an online deburring system to ensure a smooth edge;
In high-stress areas, reserve the coating thickness in advance to enhance the adhesion.
These measures ensure that the inner liner can maintain its corrosion resistance and easy cleaning properties during long-term use, significantly reducing after-sales complaints.