Engineering Stretch Forming Machines
for Precision Profile Bending

Solve Key Challenges in Stretch Forming

What Is 
Stretch Forming Machine?

Stretch-bending shapes aluminum extrusions by first applying axial tension that reaches or slightly exceeds the material’s yield strength. This allows the extrusion to fully enter a state of plastic deformation before it is bent and pressed into the die grooves. This specialized stretch forming process ensures highly precise curves and significantly reduced springback.

PBF provides the PBF Series Stretch Forming Machines, specifically engineered for the high-precision bending and forming of aluminum extrusions and sheets.
Springback Control: Precise axial tension control ensures predictable material behavior and minimal springback. Deformation Control: Uniform stress distribution prevents wrinkling, collapse, and section distortion. Cracking Prevention: Optimized tension and tooling design eliminate material overstress and surface failure.

Precision Performance: High forming accuracy with minimal springback for tight-tolerance projects.
Flawless Finish: Smooth and consistent curvature with excellent surface protection during forming.
Uniform Quality: Consistent stretching over the entire profile length to prevent deformation.
Smart Control: Reliable and repeatable CNC-controlled operation for automated production.
Robust Engineering: High structural rigidity designed for heavy-duty extrusions.
Maximum Uptime: Long service life with low maintenance requirements, ensuring a high ROI.

Stretch Forming Machine is also referred to as Stretch Bending Machine, Stretch Forming Press, Extrusion Stretch Forming Machine, Stretch Forming Equipment, and Sheet Stretch Forming Machine.

Mastering Complex Geometries with Multi-Axis Precision

Types Of 
Stretch Forming Machine

Stretch forming machines are defined by their mechanical architecture and forming methodology, determining how tension and bending forces are applied to the profile. The main types include:

PBF provides high-performance CNC Stretch Forming solutions engineered for the most demanding industrial applications. Our PBF series features an advanced up to 18-axis synchronous control system ensuring seamless transitions across diverse production scales. By integrating real-time Z-axis lifting for 3D contouring and T-axis twist compensation for complex aerospace structural components and automotive roof rails, the system masters intricate spatial geometries with ease. Whether executing hot stretch forming for titanium alloys or processing heavy-duty profiles up to 16 meters in length, BIT delivers unmatched repeatability and a flawless finish on every complex curvature.

Rotary Table Stretch Forming Machines: The die is mounted on a central rotating table. The profile is clamped under controlled axial tension while the table rotates, forming the material around the die with high accuracy and repeatability.
Swing Arm (Twin-Arm) Stretch Forming Machines: Equipped with two synchronized swing arms that rotate around a fixed central die. The system applies controlled tension while forming the profile, suitable for complex geometries and asymmetric sections.
Longitudinal (Linear) Stretch Forming Presses: Utilize a linear carriage system to accommodate different part lengths. Axial tension is applied while the die or forming arms move relative to the profile, enabling precise forming of long and large components.
Sheet Stretch Forming Machines: Designed for forming large metal sheets using wide, segmented clamping jaws. The sheet is stretched and formed over a dedicated die, typically for aluminum or stainless steel components requiring smooth curvature and high surface quality.

Other Names: Profile Stretch Former, Aluminum Stretch Forming Machine

Achieving Precision Forming Through Controlled Material Behavior

Why  Choose
Stretch Forming

Stretch forming technology controls material deformation by applying axial tension during the forming process, resulting in improved dimensional accuracy, reduced internal stress, and stable forming performance.

PBF Stretch Bending systems are engineered for different forming requirements and precision levels. The process capability can be categorized as follows:
Low Springback Control – Springback Deviation: ≤ ±0.5°, Positioning Accuracy: ±0.05 mm
Medium Springback Control – Springback Deviation: ≤ ±0.2°, Positioning Accuracy: ±0.02 mm
High Precision Forming – Springback Deviation: ≤ ±0.1°, Positioning Accuracy: ±0.01 mm

Forming Capability – Large Radius Forming, Complex Cross-Sections, 2D and 3D Profile Forming
Material Behavior Control – Reduced Internal Stress, Uniform Material Distribution, Stable Geometry
Surface Quality – Smooth Curvature, Minimal Surface Marking

Enable Precision Forming Across Industries

Uses Of 
Stretch Forming Machine?

Depending on the application requirements, stretch forming machines can process aluminum, stainless steel, and other metal profiles with precise curvature, controlled springback, and high repeatability.

PBF Series Stretch Forming Machines are built on an advanced multi-axis CNC synchronized control architecture, with up to 18-axis coordination. With 0.01 mm positioning precision, the system delivers precise springback control and stable forming performance.

Building & Curtain Wall Industry: Curtain wall systems, architectural façades, aluminum window and door profiles, aluminum-clad wood profiles, and large-scale curved building structures.
Architecture & Decorative Engineering: Complex curved panels, interior decoration profiles, lighting structures, exhibition designs, and custom architectural components.
Industrial Profile Forming: Heavy-duty aluminum extrusions, steel structural profiles, machine frames, guide rails, and customized industrial components requiring high precision forming.
Transportation Industry: Applications in automotive, rail transit, shipbuilding, and aerospace, including structural frames, interior/exterior profiles, and aerodynamic components.
Special Structural Components: Large radius arcs, multi-radius curves, asymmetric profiles, and complex non-standard shapes that require high-precision forming solutions.

How It Is Built?

Stretch forming machines require a high-rigidity mechanical structure and precision-controlled actuation system to ensure stable force transmission and accurate forming performance.
Stretch forming systems are typically constructed with a reinforced machine frame, synchronized multi-axis drive units, and precision clamping mechanisms. The structure must withstand high axial tension while maintaining alignment between the profile, clamping heads, and forming die.

PBF Stretch Forming Machines are built using advanced CNC-controlled hydraulic and servo systems, combined with high-strength structural components to ensure consistent forming accuracy and long-term stability.

We utilize precision-engineered components and established manufacturing processes to achieve the following characteristics:
High structural rigidity under heavy load
Stable and uniform force distribution
Precise multi-axis synchronization
Reliable clamping and positioning performance
Long service life with minimal mechanical deformation

Machine configuration range: Single-arm, double-arm, rotary table, and multi-axis systems
Control system: CNC control with multi-axis coordination (up to 18-axis optional)

How It Works?

Stretch forming operates by applying controlled axial tension to the profile while it is simultaneously formed over a die, allowing the material to enter a stable plastic deformation state before bending.

The profile is clamped at both ends and stretched to a defined force level, typically approaching or slightly exceeding the material’s yield strength. While maintaining this tension, the forming system—such as swing arms, rotary tables, or linear drives—guides the profile around the die to achieve the required geometry.

During the forming process, multi-axis coordinated motion ensures accurate control of position, angle, and force. This reduces internal stress variations and minimizes springback after unloading.
In advanced systems, additional axes enable vertical movement, rotation, and twist compensation, allowing precise control of complex 3D geometries and asymmetric profiles.
Through this process, the material exhibits reduced elastic recovery and improved geometric stability, resulting in high-precision curved components with consistent quality.