JB-40 Rebar Bending Testing Machine
| Brand | Jiubin Instruments |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Authorized Distributor |
| Country of Origin | China |
| Model | JB-40 |
| Pricing | Available Upon Request |
Overview
The JB-40 Rebar Bending Testing Machine is an electromechanical testing system engineered for standardized cold bending evaluation of reinforcing steel bars (rebar) in accordance with ASTM A615/A615M, ISO 15630-1, GB/T 232–2010, and EN 10080. It operates on the principle of controlled three-point bending—where a fixed-diameter mandrel serves as the central support, and two symmetrical rollers apply downward force to induce plastic deformation at a defined bend angle (typically 90° or 180°). This method assesses ductility, surface integrity, and resistance to cracking under bending stress—a critical quality indicator for structural reinforcement used in concrete construction. The machine features a rigid welded frame, precision-machined mandrel and roller assemblies, and a manually actuated hydraulic or mechanical loading mechanism designed for repeatable, operator-controlled displacement.
Key Features
- Compliant mandrel diameter selection range: 12 mm to 100 mm (standard sets cover common rebar grades from Ø6 mm to Ø40 mm)
- Robust structural frame fabricated from high-tensile carbon steel with anti-corrosion coating for long-term workshop durability
- Dual-position roller alignment system ensuring consistent load application and minimizing lateral slippage during test execution
- Integrated mechanical stop mechanism to limit maximum bend angle and prevent over-bending beyond specification thresholds
- Front-mounted control panel with tactile push-button interface, emergency stop switch, and status indicator lights (power, hydraulic pressure, cycle completion)
- No external power dependency for core bending function—mechanical leverage design ensures operation even during utility interruptions
Sample Compatibility & Compliance
The JB-40 accommodates deformed and plain round rebars conforming to ASTM A615 (Grade 40/60), ASTM A706, BS 4449, and GB/T 1499.2. Specimen lengths up to 1200 mm are supported with adjustable roller spacing (min. 100 mm, max. 600 mm center-to-center). Mandrels meet ISO 7801 dimensional tolerances (±0.1 mm diameter accuracy) and hardness requirements (≥60 HRC) to prevent wear-induced deviation. All test procedures align with mandatory inspection protocols required by third-party certification bodies (e.g., CNAS-accredited labs) and pre-construction QA/QC workflows mandated under ISO 9001:2015 Clause 8.5.2 and GB/T 50319–2013 (Construction Project Supervision Specification).
Software & Data Management
As a manually operated mechanical tester, the JB-40 does not incorporate embedded microprocessors or digital data acquisition. Test records—including rebar grade, diameter, mandrel size, bend angle, pass/fail outcome, and operator ID—are documented via standardized paper-based test report forms (e.g., ASTM E2234 Annex A1 templates) or integrated into laboratory LIMS platforms via manual entry. For traceability compliance under GLP and ISO/IEC 17025:2017, users are advised to retain signed hard-copy reports alongside calibration logs for mandrels and rollers (recommended recalibration every 6 months or after 500 cycles). Optional barcode-labeled mandrel kits facilitate asset tracking within metrology management systems.
Applications
- Pre-shipment verification of hot-rolled deformed bars supplied to infrastructure projects (bridges, high-rises, dams)
- In-plant quality control at rolling mills and rebar fabrication facilities
- Third-party conformity assessment for CE marking (under Construction Products Regulation EU No. 305/2011)
- Educational demonstration of metallic ductility principles in civil engineering laboratories
- Field-deployable testing in temporary site labs where electrical infrastructure is limited
FAQ
What standards does the JB-40 comply with for rebar bending tests?
ASTM A615/A615M, ISO 15630-1, GB/T 232–2010, EN 10080, and JIS Z 2248.
Can the JB-40 test epoxy-coated or stainless-steel rebar?
Yes—provided the coating remains intact during handling and the mandrel diameter complies with the minimum bend radius specified in ACI 318 or ISO 15630-1 for coated products.
Is calibration certification included with delivery?
A factory-issued dimensional verification report for the standard mandrel set is provided; full ISO/IEC 17025 calibration must be arranged locally through an accredited metrology provider.
What maintenance intervals are recommended?
Lubrication of pivot points and roller bearings every 200 cycles; visual inspection of mandrel surface finish and roller parallelism prior to each shift.
Does the machine support automated test logging?
No—data capture is manual. Integration with digital reporting tools requires external documentation workflows or optional USB-report printers (not supplied).
