The Multi-Stack Multi-Radius Tube Bender combines multi-level die stacks with dual bending modes-fixed-radius rotary draw bending and dynamic push rolling-on a single automated servo platform. Designed for complex tubular components requiring tight center-line radii and large continuous sweeps in one uninterrupted cycle, this equipment eliminates intermediate setup times, secondary bending operations, and manual tooling changes. Direct-drive electric actuators govern critical motion axes to deliver precise control over wall thinning, ovality, and bend repeatability across steel, stainless steel, aluminum, and titanium tubing.
Key Benefits
Single-Setup Execution:
Performs multiple fixed draw radii and continuous variable roll sweeps on one workpiece without stopping for manual re-tooling.
Cycle Time Reduction:
Decreases per-part processing time by combining processes previously split across separate machines or sequential tooling setups.
Servo Repeatability:
Synchronized electric drives maintain ±0.05° bend angle precision and ±0.05 mm positioning repeatability across high-volume production runs.
Material Waste Control:
Integrated springback compensation algorithms reduce scrap rates on high-value alloy tubing.
High-Clearance Bend Head:
Compact, offset mechanical structure prevents component collision during intricate three-dimensional spatial bending sequences.
How It Works
The system coordinates feeding, rotation, arm movement, and dynamic pressure die positioning through synchronized motion control.
Stack Indexing: When switching between radii, the machine automatically shifts the dynamic tooling head vertically to align the designated die set with the center line of the tube.
Rotary Draw Bending: For tight-radius turns, the clamp die, pressure die, and internal mandrel engage to execute high-precision draw bends.
Push/Roll Bending: For large sweeps or broad arcs, the pressure die adjusts position dynamically while the feed axis pushes the tube through roll dies under continuous trajectory control.
Multi-Stack Tooling Configuration
The multi-stack die assembly supports up to six stacked tooling levels, accommodating:
• Standard draw bending dies for distinct fixed center-line radii.
• Roll bending roller sets for continuous sweep geometries.
• Custom profile clamping dies designed for asymmetric or extruded aluminum profiles.
• Independent servo axes control pressure-die movement to apply targeted counter-force, reducing surface scoring and wall thinning during radius transitions.
Key Technical Features
Direct-drive electric actuators eliminate hydraulic thermal variation and maintain mechanical precision.
Servo-driven pressure die assist pushes the material along the bend zone, minimizing axial tension and wall thinning.
Software models part geometry, tooling stacks, and structural clearance prior to physical production to prevent dynamic interference.
Programmable mandrel retraction timing and automated internal fluid dosing prevent internal tube collapse.
Technical Specifications
|
Parameter |
Unit |
Standard Capability Range |
|
Max. Outer Tube Diameter |
mm |
19 – 114 |
|
Max. Wall Thickness |
mm |
0.8 – 8.0 |
|
Max. Center Line Radius (CLR) |
mm |
400 |
|
Tooling Stack Levels |
Levels |
2 – 6 |
|
Max. Bending Angle |
deg |
190 |
|
Bending Angle Accuracy |
deg |
±0.05 |
|
Feeding Positioning Accuracy |
mm |
±0.05 |
|
Rotational Axis Accuracy |
deg |
±0.05 |
|
Max. Bending Speed |
deg/sec |
150 |
|
Max. Tube Feeding Speed |
mm/sec |
1,200 |
Bending Capability
Minimum CLR: 1.0 times tube outer diameter with mandrel and wiper die assembly.
Maximum Bending Angle: 190° per bend cycle.
Combined Geometries: Fixed rotary draw bends combined with dynamic roll sweeps on a single continuous workpiece.
Compatible Profiles: Round tubes, square profiles, rectangular tubing, oval shapes, and structural aluminum extrusions.
Tube Materials
Carbon Steel:
ST37, ST52, and precision seamless hydraulic lines.
Stainless Steel:
AISI 304, 316, 316L, 409, and 439.
Aluminum Alloys:
6061-T6, 6063-T5, and 5052.
High-Performance Alloys:
Titanium Grade 2, Inconel 625, copper, and brass.
Applications of Multi-Stack Multi-Radius Tube Bender
Vehicle Exhaust Systems: Executes complex manifold bends, catalytic converter lines, and tailpipes in one continuous processing sequence.
HVAC Distribution: Forms tight manifold turns along broad structural sweeps on copper and aluminum lines.
Aerospace Fluid Lines: Bends thin-wall titanium and stainless steel lines under strict wall-thinning and ovality limits.
Structural Furniture: Combines continuous smooth-radius sweeps with tight structural attachment bends on structural tubing.
Fitness Equipment Frames: Processes asymmetric oval and rectangular tubes into ergonomic frame contours.
Machine Configuration Options
Robotic Loading Systems: Interface options for robotic arm tending or automated bundle loading units.
Multi-Stage Mandrel Rods: Multi-position mandrel actuation paired with micro-dosing internal lubrication systems.
Weld Seam Detection: Optical sensors locate tube seam alignment before clamping to protect bend uniformity.
Area Safety Protection: Integrated perimeter light curtains and safety fence enclosures linked directly to the main control system.
Tooling & Dies
Draw Dies: Machined from hardened tool steel (D2/Cr12MoV) or Ampco bronze inserts for non-ferrous materials.
Clamping Dies: Serrated or smooth grip inserts selected based on surface finish requirements.
Pressure Dies: Servo-assisted pressure dies featuring low-friction replaceable wear plates.
Wiper Dies: Solid tool steel or replaceable Ampco bronze tips engineered to prevent inner-radius wrinkling.
Mandrel Units: Multi-ball, single-ball, or cable mandrel designs tailored to specific wall-thickness-to-diameter ratios.
Why Choose Us
Annealed heavy cast frame structure resists structural deflection under maximum bending torque.
Integrated motion control algorithms eliminate dwell marks during stack shifting and radius changes.
Every unit completes 48 hours of continuous mechanical testing and coordinate measuring machine verification before delivery.
Engineering design support includes finite element analysis of material deformation and custom tooling geometry verification.
How to Choose the Right Machine
Tube Outer Diameter and Wall Thickness Ratio: Determines the required torque rating, clamping force, and mandrel drive capacity.
Center Line Radii Range: Defines the vertical stroke length and physical height required for the multi-stack setup.
Bending Process Combination: Applications requiring continuous variable arcs alongside fixed tight bends require continuous push-roll capabilities on the bottom stack level.
Volume Requirements: Continuous high-output manufacturing benefits from all-electric servo setups due to faster axis synchronization and lower power consumption.
FAQ
Q: What is the functional difference between a Multi-Stack machine and a Multi-Radius machine?
A: A multi-stack machine holds several vertically stacked die sets to switch between different fixed radii or profile shapes. A multi-radius machine includes dynamic pressure-die movement to perform variable push-roll bending. A Multi-Stack Multi-Radius machine integrates both functional principles onto a single indexing head.
Q: Is it possible to execute draw bends and roll bends on the same tube section?
A: Yes. The head shifts automatically between the upper draw dies and the lower roll dies, enabling tight-radius bends and broad sweeps on one continuous tube without unclamping.
Q: How does the control system prevent dynamic tool collisions during operation?
A: The control software runs 3D collision simulations using part geometry and machine dimensions, identifying potential mechanical interference points before physical bending begins.
Q: Can the control system import standard CAD files directly?
A: The control system supports standard STEP and IGES file formats, automatically converting 3D CAD models into Cartesian coordinates and bending sequences.
Q: How does the system compensate for material springback variations?
A: The control software stores material property tables. Operators enter measured angular variations from test bends, and the system adjusts over-bend angles automatically across the production run.