How to determine whether SPCD rolls are acceptable if surface pitting is found during inspection?
A: If the pit diameter is less than 0.3mm and the number is less than 5 per square meter, it is considered a minor defect and does not affect stamping use, so it is considered acceptable. If the pits are dense or too large in diameter, they will cause stress concentration and cracking during stamping, and the product will be considered unacceptable.
Is laser cutting suitable for SPCD rolls?
A: Yes. Its surface is smooth with few impurities, and laser cutting produces a smooth cut with a small heat-affected zone, which will not significantly affect the properties of surrounding materials. It is one of the commonly used cutting methods for SPCD rolls.
How to deal with blackening at the edges of SPCD rolls after laser cutting?
A: Optimize cutting parameters, reduce power or increase cutting speed; use nitrogen assistance during cutting to reduce oxidation and blackening; after cutting, pickle or grind the edges to remove the blackened layer.
How to solve the problem of wrinkling during batch stamping of SPCD rolls?
A: Adjust the die clamping force to prevent localized material loosening; optimize the radius of the stretching die to ensure even material stress; increase lubrication during stretching to reduce material flow resistance and prevent localized buildup and wrinkling.
What is the shelf life of SPCD rolls?
A: There is no fixed shelf life; it depends on the storage environment. Stored in a dry environment with rust-preventative oil, they can be preserved for 6-12 months. In a humid environment without protection, rust may appear within 1-3 months; it is recommended to process and use them as soon as possible.