Our GWH series rebar arc bending machine bends rebar, round bar, steel pipe, and channel steel into circular and arc shapes for construction. It covers 10-50 mm round bar, all running at 28 cycles/min on 380V 3-phase power.
The mechanical disc-drive design avoids hydraulic complexity, making this industrial rebar bending machine a lower-maintenance alternative in this capacity range.
This article covers the 5 GWH steel bar arc bending machine models, compatible materials, precision data, applications, and pricing factors to help you select the right rebar bender for your project.
video of steel bar arc bending machine
Why Construction Sites Choose a Precision Rebar Arc Bending Machine
Standard rebar bending machines perform 90° angle bends, U-bends, and straight bar work. The rebar circular bending machine fills a different role: forming rebar, pipe, and structural steel into circles and arcs for:
- Pile cage reinforcement (circular ties in foundation piles, where a rebar ring roller machine produces 80-100 ties/hour)
- Bridge pier column ties (closed-circle stirrups for reinforced bar circle bending machine work)
- Tunnel segment reinforcement (curved ring shapes, often formed by a high-torque curved bending machine for large infrastructure projects)
- Cylindrical tank walls (circular rebar cages for silos and water tanks)
- Curved staircase handrail supports (arc-bent flat bar or pipe)
- Spiral reinforcement cages (handled by spiral rebar circular and arc bending machine variants)
All 5 GWH rebar circular bending machine models share three design features that distinguish them from generic rebar benders:
- Mechanical (not hydraulic) disc drive
- A flywheel-and-disc mechanism stores rotational energy and releases it in a single bending cycle. This eliminates hydraulic oil leaks, valve maintenance, and the 1,500-2,000 PSI hydraulic systems found in hydraulic rebar benders and CNC arc benders.
- Fixed-angle dies, not variable radius
- Each spiral rebar arc bending machine ships with hardened die sets matched to the rated bar diameter. Operators swap die sets in 5-10 minutes to change bar size. Precision comes from the die geometry. This is why the GWH works as a reliable rebar radius bender—the rebar radius bender mode uses a fixed stop for repeatable arc radius.
- Direct three-phase operation
- 380V 3-phase power is standard. No CNC controller, no servo drives, no encoder calibration. A forward/reverse switch controls the cycle—simpler than an automatic rebar bender with PLC control, yet it still functions as an automatic steel bar circle bender for production runs.
Rebar Circular Bending Machine Models and Specifications
Below are the 5 models of this spiral rebar arc bending machine. All run at 28 bending cycles per minute and share the same mechanical steel bar arc bender platform.
| Model | Round Bar | Spiral Rebar | Motor Power | Input Voltage | Motor Speed | Bending Speed | Machine Size | Weight |
| GWH10 | ≤12 mm | ≤10 mm | 3 kW (copper winding) | 3-phase 380 V | 1440 rpm | 28 bends/min | 800*750*800 mm | 220 kg |
| GWH24 | ≤26 mm | ≤24 mm | 3 kW (copper winding) | 3-phase 380 V | 1440 rpm | 28 bends/min | 860*750*800 mm | 255 kg |
| GWH32 | ≤32 mm | ≈28 mm | 3 kW (copper winding) | 3-phase 380 V | 1440 rpm | 28 bends/min | 880*750*820 mm | 290 kg |
| GWH36 | <36 mm | ≤32 mm | 4 kW (copper winding) | 3-phase 380 V | 1440 rpm | 28 bends/min | 920*770 *830 mm | 360 kg |
| GWH50 | <50 mm | ≤38 mm | 5.5 kW (copper winding) | 3-phase 380 V | 1440 rpm | 28 bends/min | 940*780*860 mm | 430 kg |
Notes:
- Drive system: Mechanical flywheel + eccentric disc (same drive as a steel bar arc bender)
- Die material: GCr15 bearing steel (HRC 58-62)
- Operation: Manual feed + foot-pedal cycle start (also suits electric steel bar bender workflows)
- Bending angle range: 0-180° (adjustable stop)
Materials a Rebar Arc Bending Machine Can Process
The GWH series steel bar arc bender machine bends four material categories used in construction reinforcement:
| Material Type | Diameter Range | Common Grades | Notes |
| Round bar (mild steel) | 10-50 mm | Q235, SS400, A36 | Smooth surface; easiest to bend; minimal springback |
| Rebar (HRB) | 10-38 mm | HRB400, HRB500, B500B | Ribbed surface; higher springback (3-5°); overbend 1-2° to compensate |
| Steel pipe (round) | 15-50 mm | OD Q235, Q345 | Typical wall thickness 2-6 mm; thin-wall pipe (<3mm) requires an internal mandrel |
| Channel steel / flat bar | 30-50 mm width | Q235, Q345 | Bending across the web (channel) or flat side (flat bar); produce arc/curved sections |
The mechanical disc-drive design works best with solid bar and thick-wall pipe.
Thin-wall pipe (wall thickness under 2mm) may wrinkle or ovalize—use a CNC tube bender for that application.
For spiral patterns (rebar spiral and arc bending machine work), the same GWH platform forms continuous arcs with 15-22° per cycle, doubling as a spiral bending machine when fitted with a feed table.
Common Applications of Rebar Radius Bender in Construction
Our rebar arc bending machine (or rebar circle bender, steel bar arc bender, in contractor shorthand) serves six major construction applications:
- Foundation Pile Reinforcement
- Bridge Pier Column Stirrups
- Tunnel Segment Rings
- Cylindrical Tank Wall Reinforcement
- Curved Staircase Handrail Supports
- Road Barrier Curved Sections
Operating Procedure of Shuliy Steel Bar Arc Bending Machine
The GWH rebar arc bending machine operates on a 5-step cycle.
- Step 1: Die Selection and Setup
- Select the die set matching the bar diameter.
- Step 2: Start Work
- Press the button to make the machine run.
- Step 3: Material Loading
- Insert the bar end into the die opening.
- Step 4: Circular Forming
- Arc formed with the aid of a mechanical wheel.
- Step 5: Quality Check and Stack
- Visually inspect the bend angle and radius.
Bending Precision and Quality Control
Three factors determine arc bending precision on a rebar arc bending machine:
| Factor | Specification | Notes |
| Angle accuracy | ±1.5° (mild steel), ±2.5° (deformed rebar) | Springback in HRB rebar is 3-5°; overbend 1-2° to compensate |
| Radius consistency | ±2% of nominal radius | Replace dies at 8,000-12,000 cycles |
| Surface condition | No cracks, no surface flaking on rebar ribs | Deformed rebar should be bent cold; hot-bending above 600°C is not recommended |
Die life varies with material:
- Mild steel (Q235): 12,000-15,000 cycles per die set
- HRB400 deformed rebar: 8,000-10,000 cycles
- HRB500 deformed rebar: 6,000-8,000 cycles (higher hardness accelerates wear)
For a construction site processing 200-300 bars per day, dies last 30-50 working days. Spare die sets ship with the machine; replacement dies are stocked and ship within 5 business days.
The same die sets fit every rebar radius bender model in the GWH series, including the GWH50 high-torque curved bending machine for large infrastructure projects.
Price Factors for Rebar Arc Bending Machine
Five factors affect the final Rebar Circular Bending Machine price:
- Model and capacity
- Different models and capacities have different prices.
- Die set configuration
- Standard die sets included. Extra die should be paid.
- Voltage customization
- 380V/50Hz standard. 220V/60Hz, 440V/60Hz, or 480V/60Hz configurations add cost.
- Accessories
- Foot pedal included, conveyor output, digital angle display, a spare set of bending dies, and a wheeled base for easy mobility; electric rebar bending machine (upgraded version with digital readout).
- Quantity and shipping
- Prices vary depending on the distance.
Get a Rebar Arc Bending Machine Quote
For project-specific pricing on a steel bar arc bending machine, contact our sales team with bar size, daily output target, and delivery port.
We supply single units and project-quantity orders with container loading optimization; most quotes are returned within 24 hours.
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