... purlins, in no need of roller changing.2. PLC CONTROL: The production of hole-punching, cutting-off and ... hydraulic puncher, hydraulic cutter, quick-changed-roller roll-former, electronic control system, hydraulic system, etc.4. DRIVEN METHOD: It ... motor and converter, under reliable punching position control, speed control and length control.5. ROLLFORMING PRODUCTION PROCESS: Steel Material Coil ...