1.Introduction:  The machine is used for making rings automatically. It has functions of accounting ring length, folding one side of ring, seam welding ring and curling another side of ring. The produced rings are used as Chine on both drum ends. This machine is controlled by PLC and inverter.  2.Technical parameter: ModelSANHG700 Ring diameter250mm-700mm Steel band width35-75mm or customerized Steel band thickness0.5mm Cutting tolerance+/-0.5mm Production speed300pcs/hour Cut off methodPneumatic cutting Welding methodSeam welding Power10KW/380V/50HZ/3Phases Weight2500kg Dimension2500X2500x1800mm