Hydraulic Mandrel Tube Bender
Hydraulic Mandrel Tube Bender
The Hydraulic Mandrel Tube Bender is engineered for multi-axis cold bending of thin-walled metallic tubing where cross-sectional roundness is critical. Powered by closed-loop hydraulic actuation and synchronized CNC servo controls, this machine maintains tight dimensional tolerances on complex geometries, eliminating ovalization, wrinkling, and collapse on tight center-line radii.
Technical Specifications
|
Specification Parameter |
Standard Model Reference |
Heavy-Duty Model Reference |
|
Max. Tube Outer Diameter (OD) |
50 mm (2.0 in) |
114 mm (4.5 in) |
|
Max. Wall Thickness |
3.0 mm (0.12 in) |
8.0 mm (0.31 in) |
|
Min. Center Line Radius (CLR) |
1 x OD (Application Dependent) |
1.2 x OD |
|
Programmable Axes (CNC) |
3 to 5 Axes (Y, B, C, Feed, Rotation) |
3 to 6 Axes |
|
Max. Bending Angle |
190 deg |
180 deg |
|
Hydraulic System Pressure |
16 MPa |
21 MPa |
|
Control System Interface |
Industrial Touchscreen IPC (EtherCAT Bus) |
Industrial Touchscreen IPC (EtherCAT Bus) |
|
Drive Motors |
AC Servo Motors (All Axes) |
AC Servo Motors + Planetary Reducers |
Key Features
Synchronized Mandrel Extrusion: Programmable early mandrel retraction prevents galling on the inside wall while providing continuous internal support precisely at the tangent point of the bend.
Rigid Cast Iron Frame: Meehanite cast iron base absorbs high torsional and bending loads, minimizing structural deflection during continuous high-tonnage production cycles.
Multi-Stack Tooling Setup: Accommodates up to three different radii simultaneously in a single setup, reducing cycle times for complex multi-bend components.
Closed-Loop Hydraulic Circuit: Variable displacement piston pumps combined with proportional flow and pressure valves deliver repeatable positioning accuracy within +/- 0.05 deg.
Integrated Wiper Die Holder: Independent micro-adjustment mechanism ensures exact alignment between the wiper die and the bend die, preventing front-of-bend wrinkling on thin-wall stainless steel and titanium tubes.
Working Process
Loading & Clamping: The raw tube is loaded onto the feed carriage, clamped firmly by the pressure die and clamp die.
Internal Support Positioning: The mandrel advances internally to the programmed tangent position, providing solid backing against radial collapse.
Bending Execution: The main bend arm (C-axis) rotates around the bend die while the pressure die assists at a synchronized linear speed to control material elongation.
Mandrel Extraction: Just before the bend completes, the mandrel retracts incrementally to prevent scoring the internal bore.
Unclamping & Indexing: Dies release the finished bend, and the carriage indexes and rotates the tube for the subsequent bend sequence.
Applications
Automotive Exhaust & Fluid Lines: Forming complex exhaust manifolds, turbocharger oil feeds, and chassis structural members in stainless steel and aluminized carbon steel.
Aerospace Tubing: Bending high-strength, thin-walled nickel alloys and titanium hydraulic lines meeting strict aerospace NDT standards.
HVAC&R Heat Exchangers: Producing uniform return bends in copper and aluminum condenser coils without flow restriction.
Heavy Equipment Hydraulics: Fabricating high-pressure hydraulic distribution lines for construction and agricultural machinery.
Tooling & Configuration
Precision bending relies entirely on correct tooling synergy. Standard configurations include:
Mandrels: Multi-ball flexible mandrels for tight radii (1 x OD), hard plug mandrels for thick-walled tubes, and formed mandrels tailored to specific ID tolerances.
Dies: Matching sets of clamp dies, pressure dies, wiper dies, and bend dies manufactured from hardened tool steel (H13) or aluminum-bronze alloys to prevent material pickup and galling.
Quick-Change Subsystems: Hydraulic quick-disconnect manifolds and modular tool mounts reduce changeover downtime to under 20 minutes.
Customization
Extended Bed Lengths: Custom carriage travel lengths up to 6,000 mm for long tubular frames.
Automatic Loading/Unloading Integration: Gantry loaders or robotic arm interfaces for lights-out automated production cells.
Specialized Alloy Packages: Hardened internal components and specialized lubrication delivery systems designed for high-nickel superalloys and heavy-wall structural pipes.
Quality & Testing
Internal production utilizes high-precision CNC boring and milling centers (such as DMG Mori and Okuma) to machine main frames and bend arms in a single setup, ensuring geometric parallelism.
Dimensional Inspection: Every chassis and primary tooling assembly is verified using laser trackers and 3D coordinate measuring machines (CMM).
Hydraulic Pressure Testing: Assembled hydraulic power units undergo a 24-hour continuous pressure endurance test at 1.5 times working pressure to detect leaks and valve drift.
Trial Run Certification: Machines undergo a 1,000-cycle dry run followed by a live material test bend. Inspection reports including wall-thickness ultrasonic testing data and radius contour graphs ship with each unit.
FAQ
Q: What determines whether a tube requires a mandrel and a wiper die?
A: Mandrels are required when the ratio of wall thickness to outer diameter (T/OD) falls below 7%, or when the center-line radius is tight (less than 2 x OD), to prevent wall collapse and ovalization. Wiper dies are necessary when bending thin-walled tubes with tight radii (less than 1.5 x OD) to prevent compressive wrinkles from forming on the inside radius of the bend.
Q: How is springback compensated for on high-strength alloys like Inconel or Titanium?
A: The CNC control system incorporates adaptive springback algorithms based on material yield strength, wall thickness, and bend angle input. The machine executes a programmable over-bend angle, and built-in angle-checking feedback sensors measure the actual recovered angle post-bend, automatically adjusting the final stroke in real time.
Q: What is the typical changeover time between different tube diameters?
A: Equipped with the optional hydraulic quick-change tooling system and touchscreen recipe recall, a complete changeover of mandrels, clamp dies, and stack tooling takes between 15 and 25 minutes for an experienced operator.
Q: What utility requirements are needed for installation?
A: Standard installations require a 3-phase industrial power supply (typically 380V to 480V, 50/60Hz), a compressed air supply of 0.6 MPa (85 PSI) for pneumatic assists, and an initial fill of ISO VG 46 anti-wear hydraulic oil (reservoir capacities range from 150 to 300 liters depending on tonnage).
Q: How do you ensure long-term positional accuracy of the bend arm and feed carriage?
A: All primary motion axes utilize preloaded ground ball screws or heavy-duty helical rack-and-pinion drives coupled directly to absolute multi-turn AC servo motors. This closed-loop configuration eliminates backlash and removes the need for mechanical limit switches or homing cycles after power interruptions.
Q: What inspection documentation and factory testing are provided prior to shipment?
A: Each machine ships with a comprehensive QA dossier containing CMM geometric inspection sheets, hydraulic schematic diagrams, electrical circuit layouts, CE compliance certificates, and material test reports for structural weldments. Customers are also welcome to conduct a Factory Acceptance Test (FAT) on-site using their own raw material batches.
Hot Tags: hydraulic mandrel tube bender, China hydraulic mandrel tube bender manufacturers, suppliers, factory, Automatic Tube Cold Sawing Machine, CNC Automatic Circular Saw Machine, CNC Heavy Duty Pipe Cutting Machine, CNC Pipe Bending Machine, CNC Programmable Tube Bender, Square Tube Sawing Machine
You Might Also Like
Send Inquiry