PBF-AU Automotive Bumper Beam & Roof Rail Stretch Forming Machine
The PBF-AU series swing arm stretch bending machine is specifically engineered for high-efficiency production of automotive bumper beams, roof rails, and complex structural profiles. As an advanced stretch bending machine, it utilizes 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, this stretch bending machine 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.