Patent ID: 9492897
Filing Date: 2016-11-15
CPC Classification: B21K,B23P,B62D,F16H,Y10T

Claim Text:
1. A method of manufacturing a rack shaft comprising: providing a blank that is equipped with a first shaft portion, a second shaft portion, and a machining target portion, which is located between the first shaft portion and the second shaft portion, wherein a volume per unit length of at least one of a first end portion of the machining target portion, which is close to the first shaft portion, and a second end portion of the machining target portion, which is close to the second shaft portion is greater than a volume per unit length of an intermediate portion in the axial direction of the machining target portion; and molding a plurality of rack teeth, which are aligned in an axial direction of the blank, on the machining target portion by forging the machining target portion while gripping the first and second shaft portions, wherein the molding forms the rack teeth in both of the first end portion of the machining target portion and the second end portion of the machining target portion.