The R-15 is a professional round and right-angle lock former, a dedicated equipment for round duct fabrication and elbow seam processing in HVAC engineering. It is optimized for the closed lock processing of circular air ducts and 90° elbow forming, with a processing thickness range of 0.5mm to 1.5mm, equipped with a 2.2KW dedicated motor and customized forming rollers for round duct seams. The machine has a compact structure, simple operation, and high forming consistency, which can effectively solve the problem of air leakage in round duct connections, and is an essential equipment for round duct production, ventilation pipe elbow making, and special-shaped duct processing in ventilation and air conditioning projects.