PBF-AU Automotive Bumper Beam & Roof Rail Stretch Forming Machine
The PBF-AU series swing arm stretch forming machine is specifically engineered for high-efficiency production of automotive bumper beams, roof rails, and complex structural profiles. Utilizing advanced gripper linear displacement technology for ultra-precise tension control, it delivers stable, high-speed bending for high-strength aluminum extrusions and steel profiles, effectively eliminating springback while guaranteeing a supreme ±0.05mm precision tolerance with zero cross-section distortion.
Advanced Gripper Linear Displacement Control: Unlike traditional stretch forming methods, the PBF-AU controls tension through precise linear displacement of the grippers on the swing arms, ensuring flawless tensioning before and during the bending cycle.
PBF-AU Swing-Arm
Stretch Forming Machine
The PBF-AU Series is a high-end forming solution engineered specifically for the automotive industry, specializing in the cold-bending plastic deformation of aluminum alloy profiles. Powered by an advanced electro-hydraulic servo control system, the equipment achieves precise execution of complex spatial 3D curves. Its typical applications span the full spectrum of automotive components, from lightweight decorative trim to heavy-duty bumper beams.
Core Technical Architecture
PBF-AU Stretch Forming Machine
Unified Swing-Arm Design
Utilizing a synchronized twin-arm structure that rotates around a fixed center die, the system adheres to the globally recognized logic for high-precision stretch forming.
Multi-Axis Linkage
Supporting CNC path programming, the system enables simultaneous linkage of bending, stretching, Z-axis elevation, and gripper rotation, easily managing asymmetric sections, multi-radius curves.
Electro-Hydraulic Servo System
Equipped with military-grade servo motors and German-imported gear pumps, it achieves dual closed-loop control of both pressure and displacement. Compared to traditional hydraulic systems, it delivers a positioning accuracy of ±0.05mm while significantly reducing energy consumption.
Key Technical Specifications
- Production Efficiency: A typical cycle time for automotive bumper beams is 45–55 seconds, with a yield rate exceeding 98%.
- Stretching/Forming Force: Ranges from 15kN (lightweight trim) to 55 Tons (heavy-duty bumper beams).
- Clamp Distance: Features a flexible linear carriage adjustment system, covering a range of 600mm – 3000mm to accommodate varying part lengths.
- Precision Performance: Motion accuracy for bending, elevation, and rotation is controlled within ±0.1mm, with an inner contour tolerance of <±1mm.
Structural & Functional Highlights
- Active Gripper Tension Logic: Moving away from low-precision “moving die” methods, the system applies axial tension via the linear displacement of grippers on the forming arms. This ensures constant tension control and effectively eliminates springback issues.
- Diverse Module Integration:
- Z-axis Elevation & Gripper Rotation: Supports 3D spatial forming, ensuring precise control over the twist (warpage) of complex parts like decorative trim.
- Multi-Joint Mandrel Filling: For multi-cavity aluminum profiles, the system automatically inserts mandrels to prevent cross-sectional collapse or wrinkling during bending.
- Automation Expansion: Supports integration with robotic arms for automated loading/unloading and real-time monitoring.
Uses Of
PBF-AU Stretch Forming Machine?
- Automotive Bumper Beams: Perfectly handles high-strength aluminum bumper profiles (6000 & 7000 series) ensuring maximum energy-absorption structures without fracturing.
- Roof Luggage Rails & Longitudinal Beams: Provides flawless multi-radius bending for complex-section aluminum roof rails with consistent cross-section thickness.
- EV Battery Pack Frames & Crash Boxes: Delivers rapid, high-repeatability stretch forming for electric vehicle chassis components.
Industrial-Grade Reliability
Zero-Leakage Manifold Design: The hydraulic system utilizes integrated valve blocks, completely eliminating common industry issues like oil leaks and pressure fluctuations, making it ideal for high-intensity, multi-shift production.
High-Rigidity Frame: The machine structure undergoes tempering, aging, and sandblasting treatments, combined with CNC precision-machined mounting surfaces to ensure long-term static and dynamic stability.
Pro Tip: Beyond the multi-joint mandrel filling system that ensures cross-sectional integrity, we offer 3D vision-guided robotic handling, in-line positioning hole punching, and quick-change tooling interfaces. These features transform the PBF-AU from a standalone stretch forming machine into an integrated automated cell with self-sensing capabilities and high-precision processing logic.
“Precision Starts with the Right Tonnage”
Don’t guess your machine requirements. Use our Bending Force & Machine Tonnage Calculator to define your technical specifications with confidence.