... reduce machine 1. Max. diameter: 40mm 2. Wall thickness: 2mm 3. Forming time: 7-30s/time CNC Pipe ... and high efficiency. Necking can be used for pipe end, expanding, drum kits, bars and other ... shapes upsetting forming process. For pipe plug, automotive tubing, air duct, water pipes, ... 5. Can be reduced tube, expansion tube, pipe and other blunt way of processing and is ideal ...