20‑Meter Aluminum Bar Precision Cold Drawing Machine – Engineered for Extra‑Long, High‑Accuracy Production
- Jul 1
- 4 min read
Specialized hydraulic drawbench designed for processing aluminum bars up to 20 meters in length – delivering ±0.03 mm dimensional accuracy, superior surface finish, and consistent mechanical properties for aerospace, automotive, and industrial applications.
Why 20‑Meter Aluminum Bars?
Standard cold drawing machines typically handle lengths up to 12 meters. However, modern manufacturing increasingly demands extra‑long aluminum bars for:
Aerospace – Continuous structural stringers, wing spar blanks, fuselage frames
Railway & transportation – Long guide rails, structural profiles for train bodies
Industrial automation – Extra‑long linear shafts, conveyor rails
Marine – Long structural components for shipbuilding
Drawing 20‑meter bars in one continuous pass eliminates welded joints, reduces material waste, and improves fatigue performance.
The Challenges of 20‑Meter Aluminum Bar Drawing
Challenge | Why It Matters | FangRong Solution |
Alignment over long distance | Even 0.1° misalignment causes 35 mm deviation at 20 m | Extended, precision‑ground carriage guide rails (±0.02 mm/m straightness) |
Bar sagging during loading | Sag creates bends that are difficult to straighten | Powered roller supports along the infeed path – supports the bar every 2 m |
Hydraulic force consistency | Pressure drop over long stroke can cause dimensional variation | Closed‑loop force compensation – maintains constant force regardless of stroke position |
Surface scratching | Long bars are prone to handling scratches | Padded transfer rollers and guided infeed – no metal‑to‑metal contact |
Straightness after drawing | Long bars amplify residual bends | In‑line multi‑roll straightener with 20‑m capacity |
Key Technical Specifications
Parameter | Value |
Bar diameter range | 10 – 80 mm (round, hexagonal, square) |
Bar length (max) | 20,000 mm (20 m / 65.6 ft) |
Drawing force | 15 – 50 tons (customizable) |
Drawing speed | 0 – 12 m/min (programmable) |
Dimensional accuracy | ±0.03 mm (typical) |
Surface finish | Ra ≤0.4 µm |
Straightness after drawing | ≤0.2 mm/m (with in‑line straightener) |
Material alloys | 6061, 7075, 2024, 6063, 7050 |
Core Technologies for 20‑Meter Precision Drawing
Extended carriage guide system – Precision‑ground rails with 20 m travel length; anti‑deflection design maintains alignment within ±0.02 mm over full stroke.
Closed‑loop force control – Pressure sensors at the cylinder and carriage monitor force in real time; the control system compensates for any pressure drop over the long stroke.
Multi‑point bar support – Roller supports along the infeed and outfeed paths prevent sagging and reduce friction.
Hydraulic gripping system – Padded jaws with adjustable clamping force – protects soft aluminum surfaces.
DLC‑coated / polished carbide dies – Prevents aluminum adhesion (galling) and ensures bright surface finish.
In‑line straightener (optional) – Multi‑roll or two‑roll straightener with extended roll bed for 20‑m bars.
How the 20‑Meter Drawing Process Works
Bar preparation – The aluminum bar is pointed (end reduced) using a hydraulic or rotary pointer.
Loading – The bar is fed into the drawbench via powered roller supports – no manual handling.
Gripping – Hydraulic jaws secure the pointed end.
Drawing – The carriage pulls the bar through the die; closed‑loop control maintains constant force.
Exit support – The drawn bar is guided onto outfeed roller supports – prevents sagging.
Straightening (optional) – The bar passes through an in‑line multi‑roll straightener.
Cut‑to‑length – A precision saw cuts the bar to specified lengths (optional).
Materials & Typical Applications
Alloy | Typical Product | Why 20‑m Length Is Beneficial |
6061‑T6 | Structural shafts, machine rails | Reduces joints in long automation systems |
7075‑T651 | Aerospace stringers, spar blanks | Eliminates welded joints – improves fatigue life |
2024‑T4 | Aircraft structural members | Continuous grain flow – no weak points |
6063‑T5 | Architectural trim, handrails | Aesthetic finish – fewer visible joints |
Why Choose FangRong for 20‑Meter Aluminum Bar Drawing?
26 years of cold drawing experience – Thousands of drawbenches installed worldwide.
Proven long‑length designs – Multiple 15‑m and 20‑m drawbenches operating in aerospace and automotive plants.
Surface protection guarantee – No galling, no scratches – Ra ≤0.4 µm.
Custom die design – Engineered for your specific aluminum alloys.
Global service network – Installation, training, remote diagnostics, spare parts.
Real‑World Example – Aerospace 7075 Bars for Stringers
A European aerospace manufacturer needed 19.5‑m 7075‑T651 aluminum bars for wing stringers – ±0.03 mm diameter tolerance, Ra 0.3 µm surface. They previously imported bars from two suppliers and butt‑welded them – causing fatigue failures.
After installing a FangRong 20‑m hydraulic drawbench:
Continuous length – 19.8 m drawn in one pass
Diameter tolerance – ±0.025 mm
Surface finish – Ra 0.2 µm
Fatigue life – 40% improvement over welded assemblies
Scrap reduction – 8% to 1.2%
Optional Automation & Integration
Automatic bar loading – Magazine infeed with roller support system
In‑line straightener – Multi‑roll or two‑roll for post‑draw geometric correction
Cut‑to‑length saw – Precision cutting with ±1 mm length accuracy
Automatic stacking – Bundling system for 20‑m bars
Data logging – Full traceability for AS9100 / ISO 9001
Facility Requirements – 20‑Meter Drawbench
Requirement | Specification |
Total line length (with infeed, drawbench, outfeed, straightener) | Approximately 28–30 m |
Ceiling height | Minimum 3.5 m (for bar handling) |
Floor loading | Reinforced concrete – 5 tonnes/m² capacity |
Power supply | 380–415 V, 3‑phase, 50/60 Hz (depending on location) |
Conclusion – Extra‑Long Bars, Extra‑Long Value
A 20‑meter aluminum bar drawn in one continuous pass is not just about length – it is about eliminating joints, improving fatigue life, and enabling next‑generation designs in aerospace, rail, and automation. FangRong’s precision hydraulic drawbench for extra‑long aluminum bars delivers the accuracy, surface quality, and consistency that these demanding applications require.
Contact FangRong with your bar specifications and target length for a custom solution.
Know More About Us FangRong Metallurgical Equipment Manufacturer in China since 1998. Professional in Metal Straightening machine, Cold Drawing machine, Push Pointer Drawing Machine, Automatic Three Lines Drawing Machine, Thread rolling machine, Tube-end shrinking machine, Pointing Machine, Core pipe machine, Polishing Machine etc.
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Keywords: 20‑meter aluminum bar cold drawing machine, extra‑long aluminum bar drawbench, hydraulic drawbench for long bars, aerospace aluminum bar drawing, 20‑m drawbench, continuous aluminum bar drawing, long‑length cold drawing.
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