High-precision purlin roll former with auto-cutting

A purlin roll forming machine is a sophisticated automated equipment engineered specifically for cold roll forming processes, playing a pivotal role in the production of structural purlins used in steel-framed buildings. Its primary function is to transform flat metal sheets—including galvanized steel, color-coated steel, and cold-rolled steel—into purlins with precise cross-sectional shapes such as C, Z, and U profiles through a series of continuous rolling operations. This machinery is indispensable in modern construction, providing the critical support structures for roofs and walls in industrial plants, warehouses, stadiums, and commercial buildings.

The core working principle relies on cold forming technology, which eliminates the need for preheating the metal material. Instead, the machine uses 15-25 sets of sequentially arranged rollers, each designed to incrementally bend the sheet to a specific angle or curvature. This gradual deformation process preserves the material’s mechanical properties, avoiding the structural weaknesses that can result from high-temperature processing. The entire production cycle is fully automated, from the initial uncoiling of the metal coil—secured by a hydraulic tensioning decoiler—to guided feeding, roll forming, precise cutting, and final stacking of finished purlins. A PLC control system with a user-friendly touchscreen interface oversees operations, allowing operators to set parameters like length, thickness, and production speed with ease.

Key components of the machine include a guiding device equipped with correction wheels and limit plates, which dynamically adjusts the sheet’s position to prevent misalignment during forming. The forming rollers, crafted from high-strength alloy steel and hardened to HRC55 or higher, ensure long-term durability and shape retention under continuous operation. For cutting, a hydraulic flying saw system synchronizes with the sheet’s movement, delivering burr-free cuts with length tolerances within ±1mm without interrupting the production flow.

This equipment offers numerous advantages: energy efficiency, consuming 60% less energy than hot rolling processes; high precision, with cross-sectional dimensional errors controlled within ±0.5mm and straightness within 1mm/m; and exceptional material utilization exceeding 95%, minimizing waste compared to traditional stamping methods. Its flexibility is another standout feature—by replacing modular roller sets (a process taking just 30-60 minutes), it can process sheets 0.8-3mm thick and 100-300mm wide, producing purlins 1-12 meters long to meet diverse construction needs.

Widely adopted across the steel structure industry, purlin roll forming machines drive the development of lightweight, modular, and green building practices, solidifying their status as essential tools in modern construction manufacturing.