Abstract: A method of forming a cylinder by spinning. A cylindrical blank is placed at a geometric center of a lower mold cavity, where a bottom of the lower mold cavity is provided with a straight hole, and a blank block is provided at the straight hole. The lower mold cavity is fixed on a rotating worktable such that the blank is directly below an upper indenter. The indenter is driven by an extruder to move vertically downwards to extrude the cylindrical blank. Meanwhile, the lower mold cavity is driven by the worktable to uniform rotate. The intender is kept still, and the lower mold cavity is continuously driven to rotate. The lower mold cavity moves vertically upwards to process an outer surface of the blank by rotation of a petal-shape inner wall. The formed cylinder is separated from the lower mold cavity to obtain the desired cylinder.

Abstract: A method of forming a cylinder by spinning. A cylindrical blank is placed at a geometric center of a lower mold cavity, where a bottom of the lower mold cavity is provided with a straight hole, and a blank block is provided at the straight hole. The lower mold cavity is fixed on a rotating worktable such that the blank is directly below an upper indenter. The indenter is driven by an extruder to move vertically downwards to extrude the cylindrical blank. Meanwhile, the lower mold cavity is driven by the worktable to uniform rotate. The intender is kept still, and the lower mold cavity is continuously driven to rotate. The lower mold cavity moves vertically upwards to process an outer surface of the blank by rotation of a petal-shape inner wall. The formed cylinder is separated from the lower mold cavity to obtain the desired cylinder.