The Automatic Rotary Draw Tube Bending Machine forms tight-radius metal tube bends without wall collapsing, wrinkling, or ovality distortion. Utilizing a rotary draw die assembly alongside internal mandrels and wiper dies, the system clamps the tube stock and draws it around a rotating form die to execute precise centerline radius bends across carbon steel, stainless steel, aluminum, and copper profiles. Programmable controls automate tube feeding, plane rotation, and bending angles, ensuring repeatability for volume manufacturing in automotive, aerospace, and HVAC lines.
How Does It Work?
Rotary draw bending secures the leading edge of the tube against a bend die. As the die rotates, it draws the tube through the bending station while a pressure die supports the outer wall and a wiper die prevents wrinkles on the inside radius. An internal mandrel supports the inner diameter through the bend zone to keep cross-sections circular. Servo-driven axes control axial feeding, spatial rotation, and primary bend angles in a synchronized single pass.
Key Features
Multi-axis servo synchronization holds bend angle precision within +/-0.1 degree and linear positioning within +/-0.1 mm.
Programmable mandrel extraction timing prevents internal wall deformation during bend completion.
Automatic springback compensation calculates material elasticity variations across different tube batches.
Touchscreen control system stores up to 500 bend programs with 3D simulation and collision detection.
Hydraulic or electric die clamping secures heavy-wall tubing under high torque.
Quick-change tooling setup minimizes downtime between production runs.
Key Advantages of Automatic Rotary Draw Tube Bending Machine
Maintains structural integrity:
Internal mandrel support limits tube ovality under 5% on tight centerline radii down to 1.5D.
Reduces manual labor:
Automated material feeding, rotation, and bending cycles cut unit cycle times.
Eliminates scrap material:
Real-time angle monitoring and automatic springback adjustments ensure first-part accuracy.
Simplifies operation:
Control interface converts CAD vector files directly into machine bending coordinates.
Technical Specifications
|
Parameter |
Unit |
Value / Range |
|
Max Outer Diameter |
mm |
38 - 114 |
|
Max Wall Thickness |
mm |
1.5 - 6.0 |
|
Max Bend Angle |
Degree |
190 |
|
Bend Angle Accuracy |
Degree |
+/-0.1 |
|
Feeding Accuracy |
mm |
+/-0.1 |
|
Max Centerline Radius |
mm |
150 - 350 |
|
Controlled Axes |
- |
3 - 5 Servo Axes |
Tube Materials
Carbon Steel: Seamless and welded structural tubing including S235, S355, ST37, and ST52.
Stainless Steel: Austenitic and ferritic grades including 304, 304L, 316, 316L, 409, and 439.
Aluminum Alloys: Medium-tempers including 6061-T4, 6061-T6, 6063, 5052, and 3003.
Copper and Brass: C11000 copper tubing and commercial brass alloys.
Specialty Alloys: Titanium grade 2 and nickel-chrome alloys for high-temperature fluid lines.
Tube Sizes and Capacity
Round Tubing: Outer diameters from 6 mm to 114.3 mm.
Square and Rectangular Tubing: Cross-sections from 10x10 mm to 80x80 mm.
Profiled Stock: Custom die sets engineered to matched cross-sections.
Wall Thickness Capacity: Accommodates thin-wall and heavy-wall tubing down to 1.5D bend radii.
Applications of Automatic Rotary Draw Tube Bending Machine
Automotive Exhaust and Fluid Lines:
Processing exhaust manifolds, converter pipes, hydraulic brake lines, and chassis structures.
Aerospace Fluid Systems:
Bending thin-wall aluminum and titanium hydraulic circuits with tight clearance limits.
HVAC and Refrigeration Parts:
Forming copper and aluminum heat exchanger loops, manifolds, and compressor piping.
Structural Frames:
Shaping steel tubular frames for furniture, medical equipment, and display fixtures.
Industrial Piping:
Fabricating boiler tubes, heat exchanger U-bends, and hydraulic power units.
Available Models
Model A-38: Designed for small-diameter tubing up to 38 mm outer diameter.
Model A-63: Mid-range capacity for tubing up to 63.5 mm outer diameter.
Model A-89: Heavy-duty capacity for tubing up to 89 mm outer diameter.
Model A-114: Multi-axis servo system for large-diameter steel pipes up to 114.3 mm outer diameter.
FAQ
Q: What is the minimum bend radius achievable on this machine?
A: With standard mandrel and wiper die tooling, the machine achieves a minimum centerline radius of 1.5 times the tube outer diameter.
Q: How does the machine prevent tube deformation and wrinkling?
A: Wrinkling and flattening are controlled by coordinating four tooling components: the bend die, pressure die, wiper die, and internal multi-ball mandrel.
Q: Can the machine import CAD files directly for programming?
A: Yes. The control software converts STEP or IGES 3D CAD files directly into machine execution coordinates.
Q: What tooling is required when changing tube diameters?
A: A full tooling change requires swapping the bend die, clamp die, pressure die, wiper die, and internal mandrel matched to the target outer diameter, wall thickness, and bend radius.
Q: How is material springback handled during production?
A: The control system uses a springback calculation program. Operators input test-bend results, and the machine adjusts over-bend values automatically.