Method for producing hollow rack bar

Details Method for producing hollow rack bar Method for producing hollow rack bar

2007-06-05

2007-06-05

Cozart, Jermie E. (Department: 3726)

Metal working

Method of mechanical manufacture

Structural member making

C029SDIG018, C072S356000, C072S370060, C072S370210, C072S370140, C072S370250, C074S422000

Reexamination Certificate

active

10679341

ABSTRACT:
A method for forging a rack bar from a blank pipe. Prior to the rack forging process, a blank pipe is subjected to a process for obtaining an adjustment of a cross-sectional shape of the blank pipe. Such a preliminary adjustment is constructed by a swaging process for reducing an outer diameter of the blank pipe and a ironing process for obtaining a desired irregular cross-sectional shape of the blank pipe. The ironing process is such that locally thickened wall portions are obtained at length wise ends as well as tooth width ends of a rack forging die.

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