Automotive Stamped Parts from Galvanized Steel

Galvanized steel stamped parts are widely used components in automotive manufacturing. They are primarily formed from galvanized steel sheets using stamping processes, offering excellent corrosion resistance and formability. Suitable for body outer panels, chassis reinforcement parts, and other areas, they effectively enhance vehicle durability and lightweighting.
 

Manufacturing Process Flow

The production of automotive galvanized steel stamped parts mainly employs multi-station progressive dies or single-operation dies. The process is divided into cold stamping and hot stamping. The following is a typical cold stamping process (suitable for covering parts), while hot stamping is used for high-strength structural parts.

1. Material Preparation: Material selection (e.g., DX54D+Z, thickness 0.6-2.0mm), leveling, and lubricant application. Uncoiling and width setting of the steel coil.
2. Blanking/Punching: Using a punch press to separate the sheet metal along the contour lines, forming the blank. Separation processes include blanking and punching.
3. Forming Process: Deep drawing, bending, flanging, etc. Cold stamping is performed at room temperature; hot stamping first heats the material to 900-950℃ (austenitization), then quickly transfers it to the mold (<10s), stamps it at high temperature, and quenches it to martensite.
4. Trimming/Shaping: Removing excess material and correcting springback (a common problem, solved by stiffeners or process optimization).
5. Surface Treatment: Phosphating and primer spraying to enhance adhesion. Inspecting dimensions and zinc layer integrity.
6. Assembly: Welding or riveting with other components to form complete parts.

Hot stamping equipment includes a heating furnace, robotic transfer arm, and integrated cooling mold to ensure a strength of over 1500MPa.

Applications in Automotive Parts

• Body Covering Parts: Such as doors and hoods, using electro-galvanized steel to ensure a smooth, corrosion-resistant surface.
• Chassis/Structural Parts: A/B pillars, longitudinal beams, using hot-dip galvanized hot stamping to achieve high strength and lightweighting (weight reduction of over 20%).
• Interior Brackets: Instrument panel frame, combining stamping and welding.