Q: What processing techniques are suitable for SPCC?
A: Stamping, bending, stretching, shearing, welding; S-state is suitable for complex deep drawing, semi-hard/hard is suitable for simple bending and shaping.
Q: How to solve the problem of excessive springback during SPCC bending (e.g., 90° to 85°–95°)?
A: ① Material: Select S-state or pre-annealed; ② Process: V-groove width 6–8t, bending radius ≥ 1t, speed ≤ 10mm/s; ③ Die: Increase blanking force or compensate for the angle (+1°–+3°).
Q: What are the common causes and countermeasures for SPCC tensile cracking?
A: Causes: Material hardness too high, draw ratio too large, insufficient lubrication, die radius too small; Countermeasures: Change to S-state, optimize die radius, use drawing oil, and perform step-by-step drawing.
Q: What are the welding methods and precautions for SPCC? A: Supports arc welding, resistance welding, and gas welding; low-carbon, easy to weld; post-weld slag removal and rust prevention (spraying/galvanizing) to avoid hydrogen embrittlement.
Q: How to degrease before SPCC surface treatment? A: Use an alkaline degreaser + ultrasonic cleaning, followed by water rinsing and drying, ensuring Ra≤0.8μm to guarantee coating/plating adhesion.