Method and apparatus for plastic working of hollow rack bar and hollow rack bar

a technology of hollow racks and hollow bars, applied in the direction of mechanical equipment, engine components, etc., can solve the problems of resource consumption efficiency reduction, increased production costs, and heavy products, and achieve the effect of increasing the degree of weight reduction and effective use of materials
US20070204668A1Inactive Publication Date: 2007-09-06MATSUOKA MINAKO +2
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
MATSUOKA MINAKO
Publication Date
2007-09-06
Estimated Expiration
Not applicable · inactive patent

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Abstract

A preparatory working device by which a work piece to be fed to a rack bar forging device is obtained. The device is provided with a die sets for obtaining a diameter reduction at a location of a blank pipe, which becomes a toothed part of a rack bar, while the wall thickness being substantially unchanged or slightly increased. The device is further provided with a die set for reducing a wall thickness at a location of the blank pipe, which becomes a connection part of the rack bar. The wall thickness reduction is one half of the initial thickness, which causes the length of the work piece to be elongated. Then a rack bar forging by a die set is done.
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Description

BACKGROUND OF THE INVENTION

[0001] 1. Field of Invention

[0002] The present invention relates to a production of rack bar in a steering mechanism of a vehicle from a pipe shaped blank by plastic working, and, more particularly, to its improvement, by which an increased reduction in the weight of the product is obtained in comparison with the prior art.

[0003] 2. Description of Related Art

[0004] A rack bar is a main part of a steering system of a vehicle and has conventionally been produced by machining from a solid bar of a rounded cross-sectional shape by using originally a hobbing machine and recently a broaching machine. However, such a machining from a solid bar of rounded cross-sectional shape makes the product to be heavy. Therefore, a solution has been proposed, wherein the machined product is subjected to a subsequent boring by using a gun drill to obtain a hollow structure, thereby reducing the weight. However, this solution makes the production cost to be increased on one hand an...

Claims

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