Selecting the right rebar processing machine starts with one critical specification: bar diameter range. Whether you run a fabrication shop, precast plant, or steel service centre, matching machine capacity to your typical rebar sizes directly impacts productivity, cut quality, and equipment lifespan. This guide reviews five Gongda machines, each engineered for specific diameter envelopes, from 4 mm stirrups to 40 mm sheared bars. We focus on processing range, power, and throughput so you can specify the right unit for your production mix. All specifications are drawn from manufacturer data and industry standards such as ISO 9001:2015 and GB/T 19001-2016. For accurate quotations, always provide your bar sizes and required output.
1. GDWQ4-15A CNC Rebar Forming Machine: Best for Small-Diameter Stirrups and Shaped Bars
Best for: Fabricators producing high volumes of stirrups and shaped bars from small-diameter rebar, typically 4–12 mm.
Why it stands out: This CNC rebar forming machine handles single-line Grade III threaded rebar (HRB400) from 4 to 12 mm and double-line from 4 to 10 mm. Its maximum pulling speed of 100 m/min enables rapid forming of complex shapes, while the 15 kW + 5.5 kW motor provides ample power for continuous operation. The bending axis sits 1,180 mm above the floor, reducing operator fatigue. Automatic clamping and pneumatic extension streamline setup and changeovers.
Real example: A precast concrete plant in Nigeria uses the GDWQ4-15A to produce stirrups for precast panels, achieving consistent bend angles and reducing manual handling. The machine’s 0–180° bending angle range accommodates most standard stirrup geometries. With overall dimensions of 4,150 × 1,220 × 2,040 mm, it fits into compact production cells.
2. GDLWZX-32 Vertical CNC Rebar Bending Center: Best for Medium-to-Large Diameter Bending
Best for: Shops needing high-precision bending of bars from 10 to 32 mm with automated positioning.
Why it stands out: The GDLWZX-32 vertical CNC rebar bending center is a versatile workhorse for medium-to-large diameter rebar. Its processing range of Ф10mm–Ф32mm covers common sizes used in beams, columns, and foundations. The bending angle range of -120° to 180° and accuracy of ±1° ensure precise shapes, while the bending length accuracy of ±1 mm supports tight tolerances. Dual bending power of 4.4 kW × 2 and travel power of 1.8 kW × 2 deliver reliable performance. It can produce stirrups with outer sizes from 500 mm up to 11 m.
Real example: A steel service centre in Nigeria employs the GDLWZX-32 to bend rebar for infrastructure projects, benefiting from its automated positioning and ability to handle large stirrups. The machine’s footprint (L 12 m × W 2.1 m × H 1.6 m) requires adequate floor space but offers high throughput for heavy-duty bending.
3. GDQX-500 Hydraulic Rebar Shearing Production Line: Best for High-Volume Cutting of 10–40 mm Bars
Best for: Mass production cutting of ribbed and round bars from 10 to 40 mm.
Why it stands out: The GDQX-500 hydraulic rebar shearing production line delivers a maximum blade shearing force of 3,600 kN and an effective blade width of 500 mm. It cuts at 6–10 strokes per minute with a feeding speed of 50 m/min, handling cutting lengths from 500 to 12,000 mm. Length tolerance is ≤±3 mm per meter, ensuring accurate cut-to-length results. The line’s total power is 47.8 kW, and it operates on 380 V. It features a collecting bin with 4 bins (2-level one-way or 4-level two-way) for efficient sorting.
Real example: For a Nigerian rebar fabricator, the GDQX-500 processes HRB400 rebar at 10 mm diameter with 43 cuts per pass (ribbed) or 45 cuts per pass (smooth round). At 22 mm, it still achieves 16 cuts per pass (ribbed). This scalability makes it ideal for service centres that handle a wide range of projects. The line’s overall dimensions (28,243 × 2,545 × 1,800 mm) require a substantial floor area but deliver exceptional throughput.
4. GDWQ4-15A CNC Rebar Forming Machine (Double-Line Configuration): Best for Dual-Line Stirrup Production
Best for: Shops looking to double stirrup output without doubling floor space.
Why it stands out: While the GDWQ4-15A is listed above for single-line operation, its double-line capacity (4–10 mm) allows simultaneous forming of two stirrups, effectively doubling production rate. This configuration is particularly valuable for fabricators with high demand for small stirrups. The machine retains the same 100 m/min pulling speed, automatic clamping, and pneumatic extension. The bending axis height of 1,180 mm and compact dimensions remain unchanged.
Real example: A rebar fabrication shop in Nigeria switched to double-line production on the GDWQ4-15A to meet tight project deadlines, reducing labor costs per stirrup. The machine’s ability to handle HRB400 rebar ensures compliance with common construction standards. For shops that frequently produce 8 mm and 10 mm stirrups, this configuration offers an excellent return on investment.
5. GDLWZX-32 Vertical CNC Rebar Bending Center (High-Precision Version): Best for Complex Bending with Tight Tolerances
Best for: Projects demanding intricate bends and minimal deviation, such as precast elements and architectural concrete.
Why it stands out: The GDLWZX-32’s ±1° bending angle accuracy and ±1 mm bending length accuracy set it apart for precision work. Its ability to bend bars up to 32 mm and create stirrups with outer sizes up to 11 m makes it suitable for large-scale elements. The vertical design saves floor space compared to horizontal benders and facilitates gravity-assisted material handling. With dual 4.4 kW bending motors and dual 1.8 kW travel motors, it maintains speed and power for demanding cycles.
Real example: A precast concrete plant in Nigeria uses this bending center to produce reinforcement cages for bridge segments, where precise bend angles are critical for fit-up. The machine’s automated positioning reduces operator error and speeds up production. Its ISO 9001:2015 certification (GB/T 19001-2016) provides assurance of consistent quality.
Matching Diameter Range to Your Production Needs
When selecting a rebar processing machine, consider your typical bar sizes, required output, and tolerance requirements. Small-diameter stirrup production (4–12 mm) favors the GDWQ4-15A, while medium-to-large bending (10–32 mm) calls for the GDLWZX-32. For high-volume cutting of 10–40 mm bars, the GDQX-500 shearing line is the clear choice. Always verify that the machine’s processing range covers your largest and smallest rebar to avoid bottlenecks. For specialized needs, Gongda offers a range of machines, including the GDWHWQ-36 CNC Rebar Arc Bend Machine and the ZD-6M-25 CNC Five-Head Stirrup Bending Machine. Contact Gongda with your bar sizes and output requirements for a tailored quotation. With proper selection, you can optimize productivity and maintain high quality in your rebar fabrication operations.