Introduction to the Steel Bar Straightening and Cutting Machine

The steel bar straightening and cutting machine, also known as the straight wire machine, is a core device in the construction industry. It is primarily used to straighten and remove rust from wire rods or curved steel bars, and precisely cut them to a preset length. The processing range covers wires with diameters from 1.8 to 13 mm, including common reinforcing bars, stainless steel wires, aluminum wires, and cold-drawn wires. The machine ensures high cut flatness and minimal length error (CNC models achieve ±1 mm) and is widely applicable in scenarios such as construction mesh production, bridge construction, and livestock cage processing.

In steel bar processing, this equipment performs pre-treatment of raw materials. Straightening accuracy directly affects the construction quality of subsequent binding and welding, while cutting efficiency determines overall project progress. It is a key device for achieving mechanization and standardization in steel bar processing.

The equipment operates through a four-step closed-loop process: straightening, feeding, cutting, and dropping. Power is transmitted to each mechanism via a motor with belt drive and gear reduction.

Straightening Mechanism: Consists of straightening rollers, pressure blocks, and bearing housings. The high-speed rotating straightening cylinder corrects the curvature of reinforcing bars through the straightening dies while removing surface rust.

Feeding Mechanism: Uses a pair of synchronously rotating pressure wheels to pull the steel bars forward through friction. Feed speed is steplessly controlled via the AC motor and adjustable spring pressure, with a maximum of 110 m/min. For double-bar processing, the distance between the pressure wheels must be adjusted to match the wire diameter.

Cutting Mechanism: Supports mechanical and hydraulic cutting. Mechanical cutting uses an eccentric wheel to move the punch up and down; the punch impacts the tool rest to cut when the steel bar reaches the preset length. CNC models use PLCs and high-precision encoders for full closed-loop control, supporting lengths from 10 to 12,000 mm, with automatic specification switching.

Wire Dropping Mechanism: With the material receiving frame at the center, cut steel bars fall into the hopper under gravity. High-end models feature a two-stage receiving system for continuous production without stopping the machine.

Core Application Fields:

Construction Engineering: Straightening of reinforcing bars for beams and columns, cutting shear wall mesh.

Transportation Infrastructure: Processing prestressed steel bars for bridges and pre-treatment of steel bars for tunnel support.

Industry Value:

Efficiency Improvement: CNC models are 5–8 times more efficient than manual operations, processing 2–3 tons of steel bars per day per machine.

Quality Assurance: Straightness error ≤ 0.5 mm/m; cutting accuracy ±1 mm; meets GB 50204-2015 standards.

Cost Optimization: Steel bar loss reduced from 3% to below 0.5%; labor costs reduced by over 30%.

Standardized Operation Procedures

Installation and Commissioning: Place the equipment on flat ground, secure the runway support, calibrate the positioning key, connect power, and idle for 2–3 minutes to ensure correct rotation of the feed wheel.

Parameter Settings: Adjust straightening die angle and feed wheel pressure according to bar diameter, set cutting length, and maintain a 0.1–0.3 mm gap between cross-cutting and vertical knives.

Processing Monitoring: Observe steel bar surface in real time. Adjust straightening wheel pressure for scratches; sharpen blades for burrs.

Key Maintenance Points

Lubrication and Maintenance: Grease transmission components weekly; check gearbox oil level monthly.

Replacement of Wear Parts: Inspect and replace straightening wheels after 50 tons of processed bars; sharpen blades as needed.

Cleaning Management: Remove debris daily; use detachable covers for deep cleaning in modular models.

Typical Faults and Solutions