Electric Rotary Draw Tube Bender

The Electric Rotary Draw Tube Bender is a fully servo-driven CNC metal forming machine engineered for high-precision, repeatable tube and pipe bending. Replacing traditional hydraulic systems with absolute encoder-driven servomotors across all working axes, this platform delivers precise angular control, eliminates hydraulic thermal drift, and cuts fluid-related maintenance.

Built in-house with heavy-walled welded steel frames normalized to relieve internal stress before precision CNC machining, the machine ensures structural rigidity under peak bending loads. Integrated industrial CNC controllers execute multi-axis interpolation for bend, feed, and rotation, accommodating complex geometries in stainless steel, carbon steel, titanium, and aluminum alloys without wrinkling or excessive ovality.

All-Electric Servo Architecture: Eliminates hydraulic oil reservoirs, pumps, and proportional valves. Power consumption drops by 40% during idle states, and thermal expansion fluctuations are removed from the bending cycle.
Rigid Meehanite Cast Iron Bending Head: Houses heavy-duty gear sets machined on 5-axis DMG Mori horizontal machining centers, maintaining tooth mesh tolerance within 0.01 mm to prevent backlash under high torque.
Dynamic Springback Compensation: Built-in algorithm measures material elastic recovery per bend angle and automatically adjusts over-bend parameters in real time based on historical batch data.
Anti-Wrinkle & Booster Support: Programmable pressure die booster (lagging or pushing) synchronizes material feed speed with the bending arm to eliminate wall thinning on tight-radius bends (R < 1.5D).
Modular Quick-Change Tooling Interface: Patented quick-release collet and mandrel extraction linkages allow tool changeovers in under 15 minutes without manual shimming.

[ Raw Tube Loading ] -> [ Auto-Feeding (Z-Axis) ] -> [ Angular Rotation (B-Axis) ]
[ Mandrel Positioning ] -> [ Rotary Draw Bending (C-Axis) ] -> [ Auto-Unloading ]
Loading & Clamping: The raw tube is loaded onto the mandrel rod. The hydraulic or pneumatic collet clamps the tube against the pressure die and clamp die.
Feeding & Orientation: The carriage positions the tube longitudinally (Z-axis) and rotates it to the correct spatial angle (B-axis) for the next bend vector.
Bending Execution: The main bend arm (C-axis) rotates around the center former die while the pressure die assists material flow. If specified, the pressure die booster pushes the material forward to maintain wall thickness.
Mandrel Extraction: The mandrel retracts slightly before the clamp opens to prevent scratching the inner wall of the tube.
Part Release: The clamping and pressure dies open, clearing the finished component for unloading.

Automotive Exhaust & Fluid Lines: Forming complex multi-radius catalytic converter inlet pipes, turbocharger oil lines, and chassis structural members in 304/409 stainless steel.
HVAC & Refrigeration: Bending copper and aluminum evaporator/condenser return bends with zero cross-section reduction.
Aerospace & Defense: Processing high-strength titanium and Inconel fuel and hydraulic lines requiring tight tolerance compliance (+/- 0.05 deg).
Commercial Furniture & Fitness Equipment: High-speed batch production of structural steel frames with consistent bend repeatability across thousands of cycles.

Precision bending relies directly on correct tooling geometry matched to material yield strength. We manufacture matching tooling sets in-house using specialized alloy steels (H13, Ampco 18 bronze, or nitrided tool steel):
Mandrel Types: Single-ball, multi-ball (2 to 7 balls), or formed-end mandrels for ultra-thin walls.
Dies Included in Standard Package: 1x Bend Die, 1x Clamp Die, 1x Pressure Die, 1x Wiper Die, 1x Mandrel Body with matching balls.
Configuration Options: Single-stack, multi-stack (for multi-radius parts), and left-hand or right-hand bending configurations based on plant layout.

Specialized Carriage Lengths: Extended bed formats to accommodate tube lengths up to 6,000 mm.
Interfacing Automation: Integration with industrial robotic arms or automatic loading magazines for lights-out manufacturing cells.
Software Integration: Custom STEP/IGES file import capability supporting direct offline programming via CAD/CAM bending simulation software (e.g., TubeCAD, VGP).
Enclosure & Safety Options: Light curtains, safety interlocks, and full perimeter enclosures meeting CE and OSHA compliance standards.

Every machine undergoes a rigorous multi-stage verification process prior to factory dispatch:
Structural Inspection: Welded frames are tested via ultrasonic flaw detection (UT) and coordinate measuring machines (CMM) to verify dimensional squareness and weld integrity.
Axis Calibration: Laser interferometers verify linear positioning accuracy on feeding axes, while autocollimators measure rotational repeatability on bending heads.
Full-Load Factory Acceptance Test (FAT): Each machine runs a continuous 72-hour trial batch using client-specified sample material, verifying actual bend angle deviation, ovality, and wall thinning rates before crating.
Material Traceability: All primary castings, gearboxes, and servomotors carry traceable mill test certificates (MTC) and serial numbers logged in our ERP system.

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