Tube bending mandrel and system using the same

A tube bending system for forming a hairpin tube, the tube bending system comprising:

• a supply of lubricant;
• a supply of atomizing medium;
• a bend mandrel, the bend mandrel comprising:
• a mandrel body having a first pair of opposing axial ends including a first upstream end and a first downstream end, the first pair of opposing axial ends including a respective first pair of axially aligned orifices at opposing ends of a first fluid passage, including a first upstream orifice and a first downstream orifice, and
• a mandrel head having a second pair of opposing axial ends including a second upstream end connected to the first downstream end of the mandrel body, and a second downstream end, the second pair of opposing axial ends including a respective second pair of axially aligned orifices at opposing ends of a second fluid passage, including a second upstream orifice and a second downstream orifice, the second downstream orifice forming an output nozzle for the mandrel head,
• a connecting tube extending between, and fluidly connecting, the mandrel head and the mandrel body, the first downstream orifice being tapered whereby the connecting tube swivels against the mandrel body to swivel the mandrel head therewith,
• the mandrel head being positionable within a length of a tube to be bent, the mandrel is configured for injecting lubricant into the tube via the second downstream orifice.