Tube for framework of bicycle, has resistance stainless steel alloy plate folded by using stamping die to form circularity and winding around metal forming die and using welding mechanism to apply welding to body to form tubular body

摘要

The tube has a high resistance stainless steel alloy plate (20) folded by using a stamping die (50) to form a required circularity and winding around a metal forming die (40) in a helicoid manner to form a helicoidal rolled tube body and by using a welding mechanism to apply welding to the helicoidal rolled tube body to form a hollow tubular body. The plate is supplied toward the metal forming die by a supplying mechanism (30). The metal forming die comprises an anterior portion forming a metal forming end (41) and a posterior portion forming a discharge end (42).