Method of manufacturing tie rod bar for steering linkage of moto

Details Method of manufacturing tie rod bar for steering linkage of moto Method of manufacturing tie rod bar for steering linkage of moto

1996-10-15

2000-03-21

Bryant, David P.

Metal working

Method of mechanical manufacture

Structural member making

7237002, 7237003, 7237013, B23P 1304

Patent

active

060387718

ABSTRACT:
A method of manufacturing a tie rod bar for a steering linkage of a motor vehicle. Between both end portions of a steel pipe material, through a multistage cold forging, there are formed a spherical section, a neck section, a first shaft section, a second shaft section smaller in diameter than the first shaft section, a hexagonal section, and a third shaft section smaller in diameter than the second shaft section, to thereby constitute the tie rod bar. Secondly, the neck section is formed at a portion of the first shaft corresponding to a proximal end portion of the spherical section, a boot groove is formed at a given position on the second shaft section, close to the spherical section, and a screw section is formed on the third shaft section. Subsequently, a heat treatment is performed to remove the residual stress from the formed components concurrently with increasing the strength and improving the ductility. Finally, a coating is made for rust prevention. The boot groove is made to have an uneven configuration.

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