Rotary Draw Tube Bending Machine
Rotary Draw Tube Bending Machine: Precision Metal Bending Solutions
Engineered for tight-radius, wrinkle-free tube and pipe processing across demanding manufacturing sectors.
Rotary draw bending is a cold-forming technology where tube stock is clamped against a rotating bend die and drawn around its radius to produce clean, repeatable bends.
How It Works
Bend Die:
Dictates the inner radius of the bend while maintaining structural alignment during rotation.
01
Clamp Die:
Holds the tube firmly against the bend die section to prevent slippage under heavy torque.
02
Pressure Die:
Travels alongside the tube stock to absorb reaction forces and mitigate deformation along the outer wall.
03
Wiper Die:
Fits tightly into the rear crevice of the bend die to eliminate wrinkling on the inside radius of thin-wall profiles.
04
Mandrel:
Fits inside the tube core at the point of bend to prevent wall collapse or flattening during rotation.
05
Advantages of Rotary Draw Tube Bending Machine
Tight Radius Bending:
Achieves center-line radii as small as one time the tube diameter without structural deformation.
Wrinkle-Free Quality:
Internal mandrel support combined with precision wiper tooling eliminates surface wrinkling and wall flattening.
High Repeatability:
Servo-driven positioning maintains angular tolerances within 0.1 degrees across volume production batches.
Versatile Geometry:
Handles complex multi-stack tooling configurations, enabling successive bends on tight 3D spatial axes.
Machine Models
|
Model Series |
Tube OD Capacity |
Max Wall Thickness |
Servo Axes |
Bend Radius |
|
RD-38 CNC |
6 mm to 38 mm |
2.5 mm (Carbon Steel) |
3 to 5 Axes |
1.0 to 2.5 x OD |
|
RD-63 CNC |
15 mm to 63.5 mm |
4.0 mm (Carbon Steel) |
3 to 5 Axes |
1.0 to 3.0 x OD |
|
RD-90 CNC |
20 mm to 88.9 mm |
5.5 mm (Carbon Steel) |
3 to 6 Axes |
1.2 to 3.5 x OD |
Automotive Systems: Exhaust manifolds, chassis framing, and coolant lines demanding uniform flow dynamics.
Aerospace Hydraulics: High-pressure alloy fuel lines requiring strict wall thinning tolerances and zero interior deformation.
Furniture Frames: Tubular seating structures and architectural handrails prioritizing surface aesthetics prior to coating.
HVAC Infrastructure: Copper and aluminum tubing arrays formed into dense, heat-exchanging geometries.
Rotary Draw vs Mandrel Bending
|
Parameter |
Rotary Draw Bending |
Mandrel Bending |
|
Core Support Mechanism |
External dies with optional internal mandrel rod |
Dedicated internal flexible shank |
|
Minimum Bend Radius |
Down to 1.0 x OD |
Typically larger than 1.5 x OD without custom dies |
|
Thin-Wall Performance |
Prevents collapse using full-tooling support |
Requires precise mandrel positioning to prevent flattening |
|
Setup Complexity |
Higher tooling alignment requirements |
Lower initial setup time for basic radii |
|
Surface Finish Control |
High aesthetic retention on polished stainless steel |
Risk of internal scraping if friction is unmonitored |
Rigid Machine Framework: Heavy-duty cast iron headstock structures absorb peak bending torque, minimizing mechanical deflection.
CNC Multi-Axis Control: Multi-stack tooling beds enable multi-radius bending and direct roll-bending integration within a single cycle.
Tooling Material Engineering: Tool steel dies undergo vacuum heat treatment and surface hardening to extend service life under continuous operation.
Automated Material Loading: Seamless integration with automated tube feeders, inline measuring systems, and robotic unloading stations.
FAQ
Request a Custom Tube Bending Feasibility Study
Submit your tube drawings and material specifications to receive a detailed tooling configuration and cycle time analysis from our engineering team.
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