Patent ID: 8104369

Claim:
A method for manufacturing a hollow rack having a tooth portion which meshes with a pinion in a shaft portion thereof while an inner threaded portion for connecting to a ball joint is formed in an inner peripheral face of an end portion thereof, comprising: a tooth forming step of forming a tooth portion in the shaft portion; an end portion hardening step of subjecting an outer peripheral face of the end portion to high-frequency hardening; a first temperature tempering step of subjecting the outer periphery of the end portion to high-frequency tempering at a first temperature; a thread cutting step of cutting threads for forming the threaded portion in the inner periphery of the end portion after the first temperature tempering step; a tooth portion hardening step of subjecting the tooth portion to high-frequency hardening; a shaft portion hardening step of subjecting the shaft portion to high-frequency hardening; and a second temperature tempering step of subjecting the end portion, the tooth portion and the shaft portion to high-frequency tempering at a second temperature lower than the first temperature.