Is degreasing required before stamping?
A: Surface oil from rolling can easily lead to die sticking and poor coating during stamping; degreasing and cleaning are necessary, and phosphating/passivation treatment may be required.
Common stamping defects and countermeasures?
A: Cracking: Reduce blank holder force, optimize fillet radius/gap, upgrade materials; Wrinkling: Increase blank holder force, optimize draw beads; Die sticking: Strengthen degreasing, change lubricant, polish the die.
Minimum inner radius for bending?
A: For bending perpendicular to the rolling direction in the annealed state, the minimum inner radius is approximately 0.5t; for bending parallel to the rolling direction, it is approximately 1.0t; the higher the hardness, the larger the minimum inner radius.
What are the weldability requirements?
A: Good weldability; can be spot welded, arc welded, and gas shielded welded; control heat input to avoid deformation and porosity; the welding area must be clean and free of oil and rust.
Can heat treatment be used for strengthening?
A: Low-carbon steel has poor quenching effect and is difficult to significantly strengthen; strength can be improved through cold rolling work hardening, or surface hardening processes such as carburizing can be used.