... , all the process finished automatically.2) Construction:The whole line is composed by decoiler, hydraulic punch press, feeding device, ... 5) Feeding device: synchronism adjusting rollers.6) Punching MachineThis line equipped with 15T hydraulic punching machine.7) Roll Forming ... , hardness after heat treatment HRC48-50, hole diameter (roller shaft diameter) φ42mm, the min. outside diameter of rollers is ...