Continuous mould used for producing circular sleeves for cars and method for producing circular sleeves

The invention discloses a continuous mould used for producing circular sleeves for cars. The continuous mould high in mould utilization rate and economical in material straps for the circular sleeves. The continuous mould comprises an upper mould body and a lower mould body, a pair of inner slices and a pair of outer slices are arranged on the surface of the upper mould body, and a pressure head used for pressing bottom materials out of a convex hull, at least two shaping heads, a punch, a piercing head and a blanking head are sequentially located in the rear of the inner slices and the outer slices of the upper mould body. The continuous mould has the advantages that the diameter of each of the outer slices and the inner slices and positional relation among the inner and outer slices, the size of the material straps for the circular sleeves for the cars can be reduced, so that materials among the outer and inner slides are assuredly not broken during stretch among the entire punching process, and meanwhile,