The Company Portable Steel Offers Rebar Bending Machine Automatic Rebar Bending Machine 4- 32mm

Product Overview

The Kowy automatic rebar bending machine is a portable, high-performance steel bar bender engineered to handle reinforcement bars ranging from 4mm to 32mm in diameter. Built on two decades of manufacturing expertise since 2003, this machine combines precision angle control with a rugged drivetrain that withstands continuous duty cycles on busy construction sites, prefabrication yards, and bridge infrastructure projects. The unit is powered by a high-torque electric motor that delivers consistent bending force without hydraulic fluid, eliminating the maintenance burden and leak risks associated with hydraulic alternatives.

What sets this machine apart from entry-level benders is its programmable angle presets. Operators can set target bend angles from 0° to 180° via the digital control panel, and the machine automatically stops at the exact position — no manual over-bend compensation required. This repeatability is critical for structural work where every stirrup and bent bar must match the engineering drawing precisely. The compact footprint and integrated carry handle make it practical for teams that need to relocate the machine between floors or across job sites throughout the day.

Key Features

Wide Diameter Range: 4mm to 32mm

A single machine covers the full spectrum of rebar sizes commonly used in residential, commercial, and civil engineering projects. The bending head accepts Grade 40, Grade 60, and equivalent international rebar grades without tooling changes. The 32mm upper limit is meaningful — it handles the larger bars used in column ties and beam reinforcement that smaller 25mm-class machines cannot touch.

Digital Angle Control with 0° to 180° Bending

The microprocessor-controlled bending stop ensures angle accuracy within ±1°. Common presets for 45°, 90°, 135°, and 180° bends are stored in memory for one-touch selection, while custom angles can be entered via the keypad. The digital readout shows both the set angle and the current position in real time, letting the operator verify each bend without reaching for a protractor.

Portable Design with Integrated Carry Handle

Despite handling 32mm bars, the machine remains compact enough for one-person transport. The reinforced carry handle is welded to the frame — not bolted — ensuring it never works loose under repeated lifting. Anti-slip rubber feet absorb vibration and prevent the machine from walking across the floor during high-torque bends on heavy bars.

High-Torque Electric Motor with Thermal Overload Protection

The wound-rotor induction motor delivers peak torque at low RPM — exactly where bending force is needed most. A built-in thermal cutout automatically shuts down the motor if internal temperature exceeds safe limits, preventing coil burnout during extended production runs. The motor is IP54 rated, meaning it resists dust ingress and water splashes commonly encountered on outdoor job sites.

All-Steel Gearbox with Hardened Gears

The transmission uses spur gears machined from alloy steel and case-hardened to HRC 58-62. Unlike planetary gear systems found in lighter-duty machines, this straight-cut design handles shock loads when the bending die hits a knot or irregularity in the rebar. Oil-bath lubrication extends service intervals to approximately 2,000 operating hours between oil changes under normal use.

Technical Specifications

Application Scenarios

High-Rise Building Construction

Column stirrups, beam reinforcement cages, and shear wall ties all require precise bending across a range of bar diameters. The machine's programmable memory eliminates manual angle checks between identical bends, cutting reinforcement preparation time significantly on multi-story projects where hundreds of identical stirrups are needed per floor.

Bridge and Infrastructure Projects

Bridge pier reinforcement and deck slab bars often require 28mm to 32mm diameters with compound bend sequences. The heavy-duty gearbox handles these larger bars without stalling, and the 180° capability allows for complete U-bend stirrups in a single operation — important for seismic-resistant designs that demand closed ties.

Precast Concrete Factories

Precast facilities run bending operations in continuous shifts. The thermal overload protection and oil-bath gearbox are designed for this duty cycle — the machine can run 8 to 10 hours per day without performance degradation. Consistent angle accuracy across thousands of bends ensures that precast elements fit together on site without rework.

Road and Tunnel Reinforcement

Tunnel lining reinforcement and road slab rebar networks use a high volume of bent bars with standardized geometries. The one-touch preset recall lets operators switch between 90° anchor bends and 135° stirrup hooks instantly, streamlining the workflow when multiple bend profiles are needed within the same production batch.

Why Choose Kowy

Ninghai Sanyuan Electric Tools Co., Ltd. has specialized in rebar processing equipment since 2003. With over two decades of focused R&D, a 3,000 m² manufacturing facility, and a 50-person production team, we have shipped rebar tools to more than 80 countries including Germany, the United States, and Spain. Every machine leaving our factory carries CE and RoHS certification, backed by multiple national patents on our proprietary bending and tying mechanisms.

We understand that our buyers — whether they are construction equipment distributors, rental fleet managers, or direct contractors — need machines that perform reliably under real job site conditions, not just in a showroom. Every rebar bender undergoes a full-load test cycle bending 32mm Grade 60 rebar before packaging. Motors are run-in for 30 minutes, gearbox backlash is checked against our 0.05mm tolerance, and the digital angle control is calibrated against a laser protractor.

Construction & Durability

Reinforced Frame with Stress-Relieved Welds

The machine frame is welded from 8mm steel plate at all load-bearing joints. After welding, the entire frame undergoes thermal stress relief at 550°C for 2 hours to eliminate residual stresses that could cause micro-cracking under cyclic loading. This is a step many manufacturers skip to reduce cost — but on a bending machine that cycles thousands of times per day, stress-relieved welds are the difference between a frame that lasts 5 years and one that develops hairline cracks in year 2.

Bending Die System — Quick-Change with Positive Lock

The bending die set uses a splined shaft connection with a spring-loaded locking pin — no tools required for die changes between bar sizes. Each die position is indexed so the operator never misaligns the die relative to the bending axis. The die set includes rollers for 6mm through 32mm bars in 2mm increments, stored in a rack mounted to the machine frame so common sizes are always within arm's reach.

Safety Features — Two-Hand Operation & Emergency Stop

The machine requires simultaneous activation of two controls spaced 400mm apart — the operator's hands must be clear of the bending zone before the cycle begins. An emergency stop mushroom button rated IP65 is positioned on the top panel for palm-slap access. If the E-stop is triggered, the control system requires a manual reset sequence before operation can resume, preventing accidental restart after an interruption.

Frequently Asked Questions

Q: How is the machine shipped and what is included in the box?

Each machine ships on a plywood pallet with steel strapping, wrapped in VCI anti-corrosion film and enclosed in a 5-layer export carton. The standard accessory kit includes: one set of bending rollers (6mm through 32mm), a foot pedal control switch, an operator manual in English, a maintenance toolkit with hex keys and grease gun, and a spare set of carbon brushes for the motor.

Q: What is the minimum order quantity?

Our standard MOQ is 1 unit for sample orders and 10 units for bulk pricing. We welcome trial orders so you can evaluate the machine on your own job site before committing to volume.

Q: Can the voltage be customized for my country?

Yes. We supply 220V, 380V, and 415V configurations at both 50Hz and 60Hz. Please specify your local power standard when placing your order and we will configure the motor and control circuitry accordingly.

Q: What is the typical lead time?

Standard models ship within 7 to 15 working days after order confirmation. Custom voltage configurations or OEM-branded units may require an additional 5 to 7 days. Container loading is handled at our Ningbo facility, approximately 40 minutes from Ningbo Port.

Q: Do you offer spare parts and after-sales support?

Yes. We maintain a comprehensive spare parts inventory including bending dies, control boards, motor brushes, gear sets, and foot switches. Parts can be shipped via DHL, FedEx, or sea freight depending on urgency. Technical support is available by email and WhatsApp during our business hours (GMT+8), and we provide video call diagnostics for troubleshooting complex issues.

Q: Can you provide OEM / private label service?

Absolutely. We OEM for multiple international brands. We can apply your logo, color scheme, and model numbering to the machine body, control panel overlay, packaging, and manual. Minimum OEM order is 30 units per model.

Contact Information

Company: Ninghai Sanyuan Electric Tools Co., Ltd.

Brand: Kowy

Email: [email protected]

Tel: +86-13116634519

Address: No.3 Goudong 2nd Road, Xuepo Development Zone, NingHai, NingBo, China

About the Author: The Kowy Engineering Team brings over 20 years of hands-on experience in rebar tool design and manufacturing. Based at the company's Ningbo production facility, the team oversees product development from initial CAD modeling through to full-load validation testing, ensuring every machine meets the performance standards demanded by construction professionals across 80+ countries.