Dual-Line Cold Drawing Machines for Copper Tubes – Double Output, Independent Control, Uncompromised Precision
Twin-line hydraulic drawbenches process two copper tubes simultaneously with independent speed and force control – delivering ±0.015 mm accuracy, Ra ≤0.2 µm surface finish, and up to 2× productivity in a single compact footprint.
DONGGUAN, China – October 19, 2026 – Copper tube manufacturers serving HVAC, refrigeration, plumbing, and automotive markets are under constant pressure to increase output while maintaining the tight tolerances and flawless surfaces that brazed joints and heat exchangers demand. Traditional single-line drawbenches require additional machines, operators, and floor space to scale production. FangRong Precision Machinery today highlighted its dual-line cold drawing machines for copper tubes – a high-output solution that combines two independent drawing lines in one shared hydraulic and control platform.
Why Dual-Line for Copper Tubes?
Copper tubes are soft, ductile, and surface-sensitive. Drawing them requires smooth, vibration-free force and precise mandrel support to prevent ovalization and wall thinning. A dual-line machine delivers these benefits for two tubes at once – without doubling the footprint, energy consumption, or operator headcount.
Advantage | Dual-Line Machine | Two Separate Single-Line Machines |
Floor space | One compact footprint | Two footprints |
Capital investment | ~30–35% lower | Full cost ×2 |
Operators per shift | 1 supervisor | Typically 2 |
Energy consumption | Shared hydraulic unit | Two power units |
Changeover | Recipe recall for both lines | Separate setup for each machine |
How the Dual-Line Copper Tube Drawbench Works
The machine features two parallel drawing carriages, each with its own die box, mandrel system, and independent servo-hydraulic control. Both lines share a common hydraulic power unit and centralized PLC, but can operate on:
Identical tubes – maximizing output for high-volume orders
Different sizes – e.g., 12 mm OD on Line 1, 16 mm OD on Line 2
Different copper grades – C11000 on one line, C12200 on the other
Each line is equipped with closed-loop force and position control, DLC-coated dies, and a precision-guided floating mandrel. An optional in-line straightener can be integrated after drawing to achieve ≤0.3 mm/m straightness in one continuous process.
Key Technical Specifications – Dual-Line Copper Tube Drawbench
Parameter | Per Line | Dual-Line Total |
Tube OD range | 4 – 50 mm | Same or mixed |
Wall thickness | 0.3 – 5 mm | Independent per line |
Drawing force | 5 – 30 tons | 10 – 60 tons combined |
Drawing length | Up to 12 m | Shared or independent |
Drawing speed | 0 – 20 m/min | Independent per line |
Dimensional accuracy | ±0.015 mm | Maintained on both lines |
Surface finish | Ra ≤0.2 µm | Consistent across lines |
Ovality | ≤0.5% of OD | Precision mandrel support |
Control system | PLC with touchscreen, recipe storage | Centralized or independent |
Core Technologies for Copper Tube Precision
DLC-coated / polished carbide dies – prevent copper adhesion and galling
Floating mandrel system – supports the internal wall without over-stressing
Closed-loop force & position control – real-time adjustment for ±0.015 mm accuracy
Smooth hydraulic drive – no chatter marks, no vibration
Padded gripper jaws – gentle clamping without surface marking
Quick-change die & mandrel system – size changes in under 5 minutes per line
In-process laser measurement (optional) – continuous OD and wall verification
Materials Processed
C11000 (ETP) – electrical and thermal applications
C12200 (DHP) – HVAC coils, refrigeration lines, plumbing
C10200 (OF) – medical gas systems, high-purity applications
C14200 – heat exchangers, process cooling
Copper-nickel alloys – marine and industrial cooling lines
Critical Applications
Industry | Application | Why Dual-Line Helps |
HVAC & Refrigeration | Condenser and evaporator coils | High-volume output with consistent bore quality |
Plumbing | Water and gas lines | Reliable dimensions for leak-free joints |
Automotive | Battery cooling tubes, oil coolers | Mixed sizes produced simultaneously |
Medical Gas | Oxygen and medical air lines | Clean bore, full traceability |
Heat Exchangers | Shell-and-tube and coaxial exchangers | Uniform wall thickness for thermal performance |
Real-World Example – HVAC Copper Tube Manufacturer
A manufacturer of copper tubes for air-conditioning coils processed 12 mm OD × 0.6 mm wall C12200 tubes. They previously operated two separate single-line drawbenches, requiring two operators and occupying 40 m² of floor space. After installing a FangRong dual-line precision cold drawing machine:
Metric | Before (2 Single Lines) | After (One Dual-Line Machine) |
Operators | 2 per shift | 1 per shift |
Floor space | 40 m² | 22 m² |
Output | 300 tubes/shift | 620 tubes/shift |
Wall thickness variation | ±0.04 mm | ±0.012 mm |
Surface finish | Ra 0.5 µm | Ra 0.18 µm |
Scrap rate | 4.2% | 0.6% |
Energy per ton | Baseline | 21% lower |
Payback period: 12 months.
Why Choose FangRong for Dual-Line Copper Tube Drawing?
26 years of non-ferrous drawing experience – thousands of copper drawbenches installed worldwide
Independent line control – each line can run the same or different products
Copper-specific die and mandrel design – eliminates galling and protects the bore
Closed-loop precision – ±0.015 mm accuracy on both lines
Complete line solutions – pointing, drawing, straightening, cutting, stacking – one supplier, full accountability
Global service network – installation, training, remote diagnostics, spare parts
Conclusion – Double Output, Single-System Simplicity
For copper tube manufacturers facing rising demand and cost pressure, the dual-line precision cold drawing machine delivers a compelling combination: double output, one compact footprint, one operator, and consistent ±0.015 mm accuracy across both lines. Whether you produce HVAC coils, plumbing tubes, or automotive cooling lines, FangRong’s dual-line drawbench helps you scale production without scaling costs.
FangRong provides complete machine and solution services for cold drawing, straightening, and pointing – all customized to your specifications.
Contact us to discuss your dual-line copper tube drawing requirements.
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: Dual-line cold drawing machine, copper tube cold drawing, twin-line drawbench, copper tube drawing machine, independent dual drawing lines, ±0.015mm accuracy, HVAC copper tube, C12200 tube drawing, FangRong Precision Machinery.
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