SUNS Suns Automotive Galvanized Steel Sheet Drawbead Testing Machine
| Brand | SUNS |
|---|---|
| Origin | Shenzhen, China |
| Manufacturer Type | Direct Manufacturer |
| Country of Origin | China |
| Model | Suns |
| Pricing | Available Upon Request |
Overview
The SUNS Suns Automotive Galvanized Steel Sheet Drawbead Testing Machine is a purpose-built mechanical testing system engineered to evaluate the interfacial adhesion integrity between the zinc coating and underlying steel substrate in automotive-grade galvanized sheet metal. Unlike conventional universal testing machines, this system replicates the combined mechanical loading conditions encountered during stamping—specifically the localized bending, reverse bending, and frictional shear induced by drawbeads in die cavities. It operates on a controlled drawbead simulation principle: a standardized U-shaped or square-section drawbead tool engages the specimen while applying programmable tensile force and lateral displacement, thereby inducing zinc layer delamination modes representative of real-world press shop failures. The machine is designed for high repeatability in quantifying coating spallation onset, critical strain thresholds, and post-yield coating retention behavior under dynamic forming constraints.
Key Features
- Drawbead-specific mechanical architecture with interchangeable hardened tooling (U-bead, square-bead, and radius-adjustable variants) compliant with OEM-defined geometry standards (e.g., GMW14872, Ford WSS-M2G173-A2)
- Integrated high-resolution load cell (±0.5% FS accuracy) and non-contact digital image correlation (DIC) system for full-field strain mapping across the coated surface
- Programmable crosshead speed range: 0.01–500 mm/min, enabling quasi-static to near-dynamic loading profiles aligned with industry-standard drawbead test protocols
- Specimen clamping system with pneumatic actuation and adjustable jaw pressure to prevent edge slippage without inducing premature coating fracture
- Rigid four-column frame with thermal-stable aluminum alloy construction, minimizing frame deflection (<0.02 mm under 10 kN load) for precise force transmission
- Modular control interface supporting ASTM E8/E8M, ISO 6892-1, and VDA 238-100 test method templates
Sample Compatibility & Compliance
The system accommodates standard coupon geometries per automotive OEM specifications: 30 × 200 mm strips (thickness range: 0.6–2.0 mm), including hot-dip galvanized (HDG), electrogalvanized (EG), and Zn-Fe alloy-coated steels. It supports both bare and pre-lubricated specimens, allowing evaluation of lubricant–zinc interaction effects on interfacial shear resistance. All mechanical components conform to ISO 12100:2012 safety requirements for testing equipment. Test data output meets GLP documentation standards, with audit trails, user authentication, and electronic signature capability compliant with FDA 21 CFR Part 11 when paired with optional validated software modules.
Software & Data Management
Control and analysis are performed via SUNS TestStudio™ v4.2—a Windows-based platform certified for ISO/IEC 17025-compliant laboratories. The software enables synchronized acquisition of load, displacement, DIC-derived strain fields, and real-time video capture at up to 120 fps. Automated pass/fail evaluation is configurable against user-defined delamination area thresholds (e.g., % coating loss >5% at 15 kN). Raw data exports support .csv, .xlsx, and .tdms formats; metadata embedding includes operator ID, calibration certificate IDs, environmental logs (temperature/humidity), and instrument firmware version. Version-controlled test methods can be locked for QA/QC workflows, ensuring method consistency across shifts and facilities.
Applications
- Validation of zinc coating adhesion performance across batch lots and supplier qualification programs
- Development and benchmarking of new alloy compositions (e.g., Zn-Mg-Al ternary coatings) for improved drawbead resistance
- Correlation studies between laboratory-scale drawbead results and full-scale press trials (e.g., predicting flange cracking in door inner panels)
- Root-cause analysis of field-reported coating spallation incidents using forensic specimen retesting under replicated process loads
- Supporting IATF 16949 clause 8.5.1.5 (process validation) for stamping line release approval
FAQ
What distinguishes this system from a standard universal testing machine?
It integrates drawbead-specific kinematics, calibrated tool geometry, and interfacial strain measurement—not just axial force—enabling direct simulation of die-induced coating failure mechanisms.
Can it test pre-painted galvanized substrates?
Yes; the clamping and tooling design accommodates organic-coated (e.g., PPC, PPG) galvanized sheets without damaging topcoats during setup.
Is third-party calibration certification available?
SUNS provides NIST-traceable calibration certificates per ISO/IEC 17025, with optional on-site verification by accredited metrology partners.
Does the system support automated reporting for PPAP submissions?
TestStudio™ includes customizable PPAP report templates (Level 3) with embedded SPC charts, capability indices (Cpk/Ppk), and compliance statements per AIAG requirements.
What maintenance intervals are recommended for long-term accuracy?
Biannual verification of load cell linearity, DIC camera focus calibration, and drawbead tool wear inspection (using profilometry) are advised per SUNS Maintenance Protocol M-DBT-2023.
