1.Where is the stamping performance support of the substrate reflected?
The substrates of color-coated coils are mostly low-carbon steel plates (such as Q195, Q235) or galvanized steel plates. This type of steel has a low carbon content (≤0.25%), good plasticity and ductility, and good stamping and forming capabilities (such as stretching, bending, flanging, etc.).
2.How is the adhesion guarantee between the coating and the substrate?
The coating of high-quality color-coated coils (such as polyester PE, epoxy EP) is closely bonded to the substrate through pretreatment (phosphating, passivation), and has a certain degree of flexibility and impact resistance. During the stamping process, if the deformation is not large (such as simple bending, shallow stamping), the coating is not easy to fall off or crack, and the surface integrity can be maintained.
3.What are the typical application scenarios of color coated coil stamping?
Outdoor products: street lamp housings, traffic sign accessories, trash can panels, etc. (need to be weather-resistant and rust-proof, and have uniform colors).
Home appliance accessories: refrigerator and washing machine housing parts (need to be beautiful and resistant to oil stains).
Advertising and decorative parts: small three-dimensional characters, sign bases (need to be colorful and lightweight).
4.What are the symptoms and solutions for coating cracking or peeling?
If the stamping deformation is too large (such as deep drawing, sharp corners), the coating may crack due to insufficient stretching, or fall off due to insufficient adhesion between the substrate and the coating (especially the coating of inferior color-coated coils is prone to this problem).
Solution: Choose a highly flexible coating (such as PVC coating) or a deep-drawn substrate (such as DX53D grade galvanized sheet), and control the stamping speed and die corner radius.
5.How to deal with surface scratches?
During the stamping process, the friction between the mold and the surface of the color-coated coil may cause scratches on the coating, affecting the appearance. The mold needs to be polished, or the surface needs to be coated before stamping (tear off after stamping).