METHOD OF MANUFACTURING MOTOR CASE FOR AUTOMOTIVE CLUTCH SHIFT MOTOR

摘要

A method of manufacturing a motor case according to the present invention relates to a method of manufacturing a motor case comprising a cylindrical main body, a bearing portion formed projecting at the top of the main body, and a coupling portion formed projecting at the top of the bearing portion, and is characterized by comprising: a drawing step of forming a circular metal plate into a round cup shape; a redrawing step of increasing the height of the round cup shape and reducing the diameter thereof and simultaneously forming the bearing portion into a rounded shape; a first top drawing step of reducing the diameter of the shape of the bearing portion and forming a top flat part that is flat around the bearing portion; a second top drawing step of forming the shape at the top of the coupling portion to project from the top of the bearing portion; a first top piercing step of forming a small hole in the top of the coupling portion; and a burring step for enlarging the shape of the coupling portion in which the small hole has been formed.