Patent ID: 7197823
Filing Date: 2007-04-03
Classification: H02K,Y10T

Abstract:
1. A method for manufacturing a cylindrical member having a cylindrical portion and an annular member fixed on and in contact with an outer circumference of the cylindrical portion, the annular member having an upper end portion and an lower end portion, comprising the steps of: forming an annular groove on the upper surface of a flat plate; forming the cylindrical portion by a plastic deformation of the flat plate by inserting a die from lower to upper direction, the annular groove being located on the outer circumference surface of the cylindrical portion; cutting the cylindrical portion out of the flat plate in from inner to outer direction, the cutting line being located in the annular groove; and fixing or securing the annular member on and in contact with the outer circumference surface of the cylindrical portion; wherein the annular member is fixed or secured so that the lower end portion of the annular member is located on the same plane as the end portion of the cylindrical portion or protrudes in from upper to lower direction from the end portion of the cylindrical portion, and the annular groove is located adjacent to the end portion of the cylindrical portion, so that a burr that is formed in the cutting step is housed in the annular groove.