The sawing process adopts a double-column gantry structure, equipped with high-speed alloy saw blades and a laser positioning system, which can accurately locate the ends of the steel bars. The cutting speed is 50% higher than that of traditional equipment, and the cuts are smooth and burr-free. For steel bars of different diameters (12–50 mm), the system can automatically adjust the saw blade speed and feed rate: when processing fine-diameter steel bars, high frequency and low speed are used to avoid deformation; when dealing with thick-diameter steel bars, feed pressure is increased to ensure cutting efficiency. Cutting error is strictly controlled within ±1 mm, laying a precision foundation for subsequent processes.
The threading process is equipped with a CNC thread rolling machine. A servo motor drives the thread rolling wheel to rotate synchronously with the steel bar, combined with adaptive pressure regulation technology, completing the threading of M16–M36 specifications within 10 to 15 seconds. The equipment has an internal thread parameter database, which can automatically match the processing method to the steel bar material (such as HRB400E, HRB500, etc.), ensuring that the thread profile is full and the precision complies with the ISO 965-1 standard. Notably, during threading, the pitch diameter of the thread is monitored in real time. Once a deviation occurs, the machine must be stopped immediately for calibration to prevent the production of substandard batches.
The grinding process, a crucial step for quality improvement, adopts a multi-station linkage design: two sets of wire wheels remove the oxide scale from the steel bar surface, and three sets of grinding wheels handle the end plane, outer circle, and thread root, ensuring the surface finish of the steel bar connection reaches Ra1.6 μm. The grinding parameters can be flexibly adjusted according to engineering requirements - in the high-gloss mode required for bridge engineering, the equipment automatically extends grinding time and increases grinding wheel pressure. In standard building projects, it switches to an efficient mode, balancing quality and speed.
The three processes are seamlessly connected through intelligent conveying tracks. After sawing, steel bars are rotated 90 degrees by a mechanical arm and sent into the threading machine. Once threading is complete, they are transported to the grinding station via a conveyor belt. The entire process requires no manual intervention. The system also features a process mutual inspection function: it automatically checks the sawing length before threading and rechecks the thread size during grinding, forming a closed-loop quality control. This integrated design shortens the processing time of a single steel bar to under 40 seconds, while keeping the finished product qualification rate consistently above 99.5%, making it a benchmark solution for modern steel bar processing.