Method of manufacturing tooth-shaped component, and tooth-shaped component

A method of manufacturing a tooth-shaped component, comprising:

• drawing process of draw-forming a workpiece so as to obtain a cylindrical container which has a bottom surface portion and a side surface portion;
• diameter-reducing process of reducing a diameter of a particular part in which a tooth tip portion is to be formed in the side surface portion of the cylindrical container, so as to increase a thickness of a corner portion between the bottom surface portion and the side surface portion;
• and
• tooth shape-forming process of forming the tooth tip portion in the particular part of the cylindrical container reduced in diameter in the diameter-reducing process, so as to obtain a tooth-shaped component which has the bottom surface portion, the side surface portion, and the tooth tip portion,
• wherein in the diameter-reducing process,
• in a case where the cylindrical container is viewed in a cross section including a central axis direction and a radial direction of the cylindrical container, when an intersection point of a straight line L1 in parallel contact with the bottom surface portion of the cylindrical container and a straight line L2 in parallel contact with the side surface portion of the cylindrical container is defined as P0, a point at which the straight line L1 starts being separated from the bottom surface portion of the cylindrical container is defined as P1, a point at which the straight line L2 starts being separated from the side surface portion of the cylindrical container is defined as P2, the length between the intersection point P0 and the point P1 on the straight line L1 is defined as ΔR, and the length between the intersection point P0 and the point P2 on the straight line L2 is defined as ΔH,
• the corner portion is increased in thickness such that an external shape of the corner portion of the cylindrical container satisfies the following conditional expression (1) expressed by using a plate thickness t of the cylindrical container, and the lengths ΔR and ΔH.
• (ΔR+ΔH)≦2t (1)