METHOD AND APPARATUS TO MANUFACTURE COLLAR USING MULTISTAGE FORMING

The present invention relates to a method and an apparatus to manufacture a collar using multistage forming and, more specifically, relates to a method and an apparatus to manufacture a collar using multistage forming, manufacturing a collar of a cylindrical shape without a deviation in thickness. According to the present invention, the method comprises: a drawing step of using a drawing punch to press a planar object to be processed to manufacture a first processed body of a container shape having a flange formed on an upper side; a first forming step of pressing the flange of the first processed body through a flange pressing part to primarily press and fixate the first processed body to a die with a diameter smaller than that of a container; and a second forming step of secondarily pressing and fixating the first processed body pressed and fixated to the die as much as a predetermined depth through the first forming step to manufacture a second processed body. COPYRIGHT KIPO 2017 (S1 ...