Galvanized Steel Stamping parts

　　Galvanized Steel Stamping Parts

　　What is Galvanized Steel Stamping?

　　Galvanized Steel Stamping is a precision forming process for galvanized metal sheets. It processes steel plates coated with a zinc layer (hot-dip galvanized/electro-galvanized) into various structural and functional parts through customized molds and stamping equipment. The zinc layer achieves corrosion protection through dual effects of physical isolation and cathodic protection, while the stamping process ensures dimensional accuracy and complex shape forming of parts. Its core characteristics are excellent corrosion resistance and structural strength, high integrity of the surface zinc layer, and no need for additional rust prevention treatment, making it suitable for mass production in multiple corrosive environments.

　　Compared with ordinary steel stamping, its core difference lies in the protection control of the zinc layer—by optimizing mold clearance, forming parameters, and lubrication methods, it avoids zinc layer detachment and scratches during stamping, maximizes the retention of corrosion resistance, and is the preferred forming solution for corrosion-resistant demand scenarios.

　　How It Works

　　The core of galvanized steel stamping is "balancing forming and corrosion protection". It achieves a balance between material forming and zinc layer protection through precise control of process parameters. The key processes and control points are as follows:

　　Galvanized Sheet Preparation: Select hot-dip galvanized (GI) or electro-galvanized (EG) steel sheets with a thickness of 0.3mm-12mm, and choose zinc layer thickness (40g/m²-275g/m²) according to part requirements; pre-treat to remove surface oil and dust to avoid affecting stamping forming and zinc layer adhesion.

　　Mold Adaptation and Adjustment: Molds are made of Cr12MoV hardened steel or cemented carbide, with surface nitriding treatment (hardness ≥HRC 60). The mold clearance is set to 1.1-1.2 times the material thickness (larger than ordinary steel stamping) to reduce zinc layer extrusion damage; the blank holder is made of elastic material to avoid hard contact scratching the zinc layer.

　　Precision Stamping Forming: Select the type of punch press (mechanical punch press, hydraulic punch press, CNC punch press) according to part complexity, control stamping speed (10-150 times/minute) and pressure, and use special anti-wear grease (to avoid corroding the zinc layer); complex parts adopt multi-pass forming, check the integrity of the zinc layer after each pass, and apply passivator if necessary.

　　Post-processing and Inspection: Remove residual lubricant on the surface after forming, perform passivation treatment or touch-up painting on cuts and bends (to enhance edge corrosion protection); inspection items include dimensional tolerance (±0.02mm-±0.1mm), zinc layer adhesion (cross-cut test ≥4B grade), and corrosion resistance (salt spray test ≥48 hours without red rust).

　　The entire process focuses on "zinc layer protection", avoiding zinc layer damage through process optimization, and ensuring that both part forming accuracy and corrosion resistance meet standards.

　　Key Components

　　Adaptive Molds: Punches and dies are made of wear-resistant materials with optimized fillet design to reduce zinc layer scratches; the mold base is equipped with ball guide pillars, with coaxiality error ≤0.005mm to avoid local extrusion and detachment of the zinc layer caused by eccentric load.

　　Specialized Stamping Equipment: Selected according to the hardness and thickness of galvanized sheets. Hydraulic punch presses are suitable for thick plate forming (reducing impact damage), CNC punch presses are suitable for complex hole processing (improving accuracy), and the equipment must be equipped with precise pressure and speed adjustment systems.

　　Zinc Layer Protection Components: Elastic blank holders, corrosion-resistant lubrication systems, and passivation treatment devices are used for zinc layer protection during stamping, forming lubrication, and subsequent corrosion protection enhancement.

　　Positioning and Guiding Mechanism: Pilot pins, side guide plates, and grating ruler positioning systems ensure sheet feeding accuracy of ±0.01mm-±0.03mm, avoiding zinc layer scratches caused by misalignment.

　　Inspection Equipment: Salt spray test chamber, cross-cut tester, and coordinate measuring machine are used to verify zinc layer corrosion resistance, adhesion, and part dimensional accuracy.

　　Advantages vs Ordinary Steel Stamping

　　Galvanized steel stamping has significant advantages in corrosion-resistant demand scenarios: In terms of corrosion resistance, the zinc layer forms sacrificial anode protection, and the salt spray test can reach 48-1000 hours (depending on zinc layer thickness), while ordinary steel sheets only last within 24 hours; longer service life—galvanized stamping parts have a service life 3-5 times that of ordinary steel parts in outdoor or humid environments; no need for additional rust prevention treatment, eliminating post-processes such as painting and electroplating, reducing comprehensive costs by 30%-50%; beautiful surface—the zinc layer presents a uniform silver-gray color, which can be used directly or as a base for subsequent spraying; excellent structural strength—the galvanizing process does not affect the mechanical properties of the steel sheet, and the strength of the stamped parts is consistent with that of ordinary steel parts, combining strength and corrosion resistance.

　　Applications

　　Automotive Industry (Largest Application Field)

　　Body components: Door frames, bumper brackets, chassis guards, fuel tank brackets

　　New energy vehicles: Battery pack housings, charging pile housings, motor protective covers

　　Commercial vehicles: Compartment guardrails, chassis connectors, water sprinkler brackets

　　Construction & Security Industry

　　Building components: Light steel keels, door and window frames, curtain wall connectors, roof supports

　　Security equipment: Monitoring brackets, guardrails, access control housings, safe sheet metal parts

　　Warehousing and logistics: Shelf beams, pallet buckles, conveyor line guide rails

　　Home Appliances Industry

　　White goods: Refrigerator housings, washing machine bases, air conditioner outdoor unit brackets, water heater inner tank fixing parts

　　Kitchen appliances: Range hood housings, gas stove brackets, disinfection cabinet door frames

　　Small appliances: Fan grilles, heater housings, microwave oven brackets

　　Agricultural & Construction Machinery

　　Agricultural machinery: Agricultural machinery cab housings, seeder accessories, irrigation equipment brackets

　　Construction machinery: Excavator guard plates, loader components, crane connectors

　　Outdoor equipment: Garden machinery housings, street lamp brackets, traffic sign pole accessories

　　New Energy & Environmental Protection Industry

　　Photovoltaic field: Photovoltaic brackets, inverter housings, junction box sheet metal parts

　　Environmental protection equipment: Sewage treatment equipment housings, waste gas purification device brackets, trash can sheet metal parts

　　Materials Used

　　Hot-dip galvanized steel sheets (GI): Zinc layer thickness 80g/m²-275g/m², strong zinc layer adhesion and excellent corrosion resistance, suitable for outdoor and humid environments, models include SGCC, DX51D+Z, DX53D+Z.

　　Electro-galvanized steel sheets (EG): Zinc layer thickness 40g/m²-120g/m², smooth and flat surface with high dimensional accuracy, suitable for home appliances and electronic equipment, models include SECC, DX51D+ZE, DC01+ZE.

　　Alloyed hot-dip galvanized steel sheets (GA): Zinc-iron alloy layer, high temperature resistance and good welding performance, suitable for automotive bodies and high-temperature scenarios, models include HC340LA+ZA, HC420LA+ZA.

　　Galvanized high-strength steel: Tensile strength ≥420MPa, suitable for structural parts with high strength requirements, such as automotive chassis and construction machinery components, models include Q355GD+Z, HC500LA+Z.

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