The utility model discloses an eccentric bending round die for a coaxial
heat exchanger, relates to the technical field of coaxial
heat exchanger processing, and aims to solve the problem that a bent
pipe section and a bending die body are prone to physical interference when a tight spiral structure is manufactured by the traditional
copper pipe spiral bending. The eccentric groove extending along the spiral track and the rotation notch used for avoiding a bent
pipe section in the rotation process of the die are formed in the circular die body, the rotation notch is formed in the outer circumferential face of the circular die body, the radial depth and size of the rotation notch are matched with the
diameter of a to-be-bent pipe, and the rotation notch effectively provides an avoiding space, so that the yield of the to-be-bent pipe is improved. The problem of bending interference is thoroughly solved, so that tight spiral coiling of pipes with smaller screw pitches can be achieved,
machining efficiency is improved, complex processes are not needed, and the structure is simple and practical.